1 /* 2 * copyright (c) 2001 Fabrice Bellard 3 * 4 * This file is part of FFmpeg. 5 * 6 * FFmpeg is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Lesser General Public 8 * License as published by the Free Software Foundation; either 9 * version 2.1 of the License, or (at your option) any later version. 10 * 11 * FFmpeg is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * Lesser General Public License for more details. 15 * 16 * You should have received a copy of the GNU Lesser General Public 17 * License along with FFmpeg; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 19 */ 20 21 #ifndef AVCODEC_AVCODEC_H 22 #define AVCODEC_AVCODEC_H 23 24 /** 25 * @file 26 * @ingroup libavc 27 * Libavcodec external API header 28 */ 29 30 #include <errno.h> 31 #include "libavutil/samplefmt.h" 32 #include "libavutil/attributes.h" 33 #include "libavutil/avutil.h" 34 #include "libavutil/buffer.h" 35 #include "libavutil/cpu.h" 36 #include "libavutil/channel_layout.h" 37 #include "libavutil/dict.h" 38 #include "libavutil/frame.h" 39 #include "libavutil/log.h" 40 #include "libavutil/pixfmt.h" 41 #include "libavutil/rational.h" 42 43 #include "version.h" 44 45 /** 46 * @defgroup libavc Encoding/Decoding Library 47 * @{ 48 * 49 * @defgroup lavc_decoding Decoding 50 * @{ 51 * @} 52 * 53 * @defgroup lavc_encoding Encoding 54 * @{ 55 * @} 56 * 57 * @defgroup lavc_codec Codecs 58 * @{ 59 * @defgroup lavc_codec_native Native Codecs 60 * @{ 61 * @} 62 * @defgroup lavc_codec_wrappers External library wrappers 63 * @{ 64 * @} 65 * @defgroup lavc_codec_hwaccel Hardware Accelerators bridge 66 * @{ 67 * @} 68 * @} 69 * @defgroup lavc_internal Internal 70 * @{ 71 * @} 72 * @} 73 * 74 */ 75 76 /** 77 * @defgroup lavc_core Core functions/structures. 78 * @ingroup libavc 79 * 80 * Basic definitions, functions for querying libavcodec capabilities, 81 * allocating core structures, etc. 82 * @{ 83 */ 84 85 86 /** 87 * Identify the syntax and semantics of the bitstream. 88 * The principle is roughly: 89 * Two decoders with the same ID can decode the same streams. 90 * Two encoders with the same ID can encode compatible streams. 91 * There may be slight deviations from the principle due to implementation 92 * details. 93 * 94 * If you add a codec ID to this list, add it so that 95 * 1. no value of a existing codec ID changes (that would break ABI), 96 * 2. Give it a value which when taken as ASCII is recognized uniquely by a human as this specific codec. 97 * This ensures that 2 forks can independently add AVCodecIDs without producing conflicts. 98 * 99 * After adding new codec IDs, do not forget to add an entry to the codec 100 * descriptor list and bump libavcodec minor version. 101 */ 102 enum AVCodecID { 103 AV_CODEC_ID_NONE, 104 105 /* video codecs */ 106 AV_CODEC_ID_MPEG1VIDEO, 107 AV_CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding 108 #if FF_API_XVMC 109 AV_CODEC_ID_MPEG2VIDEO_XVMC, 110 #endif /* FF_API_XVMC */ 111 AV_CODEC_ID_H261, 112 AV_CODEC_ID_H263, 113 AV_CODEC_ID_RV10, 114 AV_CODEC_ID_RV20, 115 AV_CODEC_ID_MJPEG, 116 AV_CODEC_ID_MJPEGB, 117 AV_CODEC_ID_LJPEG, 118 AV_CODEC_ID_SP5X, 119 AV_CODEC_ID_JPEGLS, 120 AV_CODEC_ID_MPEG4, 121 AV_CODEC_ID_RAWVIDEO, 122 AV_CODEC_ID_MSMPEG4V1, 123 AV_CODEC_ID_MSMPEG4V2, 124 AV_CODEC_ID_MSMPEG4V3, 125 AV_CODEC_ID_WMV1, 126 AV_CODEC_ID_WMV2, 127 AV_CODEC_ID_H263P, 128 AV_CODEC_ID_H263I, 129 AV_CODEC_ID_FLV1, 130 AV_CODEC_ID_SVQ1, 131 AV_CODEC_ID_SVQ3, 132 AV_CODEC_ID_DVVIDEO, 133 AV_CODEC_ID_HUFFYUV, 134 AV_CODEC_ID_CYUV, 135 AV_CODEC_ID_H264, 136 AV_CODEC_ID_INDEO3, 137 AV_CODEC_ID_VP3, 138 AV_CODEC_ID_THEORA, 139 AV_CODEC_ID_ASV1, 140 AV_CODEC_ID_ASV2, 141 AV_CODEC_ID_FFV1, 142 AV_CODEC_ID_4XM, 143 AV_CODEC_ID_VCR1, 144 AV_CODEC_ID_CLJR, 145 AV_CODEC_ID_MDEC, 146 AV_CODEC_ID_ROQ, 147 AV_CODEC_ID_INTERPLAY_VIDEO, 148 AV_CODEC_ID_XAN_WC3, 149 AV_CODEC_ID_XAN_WC4, 150 AV_CODEC_ID_RPZA, 151 AV_CODEC_ID_CINEPAK, 152 AV_CODEC_ID_WS_VQA, 153 AV_CODEC_ID_MSRLE, 154 AV_CODEC_ID_MSVIDEO1, 155 AV_CODEC_ID_IDCIN, 156 AV_CODEC_ID_8BPS, 157 AV_CODEC_ID_SMC, 158 AV_CODEC_ID_FLIC, 159 AV_CODEC_ID_TRUEMOTION1, 160 AV_CODEC_ID_VMDVIDEO, 161 AV_CODEC_ID_MSZH, 162 AV_CODEC_ID_ZLIB, 163 AV_CODEC_ID_QTRLE, 164 AV_CODEC_ID_TSCC, 165 AV_CODEC_ID_ULTI, 166 AV_CODEC_ID_QDRAW, 167 AV_CODEC_ID_VIXL, 168 AV_CODEC_ID_QPEG, 169 AV_CODEC_ID_PNG, 170 AV_CODEC_ID_PPM, 171 AV_CODEC_ID_PBM, 172 AV_CODEC_ID_PGM, 173 AV_CODEC_ID_PGMYUV, 174 AV_CODEC_ID_PAM, 175 AV_CODEC_ID_FFVHUFF, 176 AV_CODEC_ID_RV30, 177 AV_CODEC_ID_RV40, 178 AV_CODEC_ID_VC1, 179 AV_CODEC_ID_WMV3, 180 AV_CODEC_ID_LOCO, 181 AV_CODEC_ID_WNV1, 182 AV_CODEC_ID_AASC, 183 AV_CODEC_ID_INDEO2, 184 AV_CODEC_ID_FRAPS, 185 AV_CODEC_ID_TRUEMOTION2, 186 AV_CODEC_ID_BMP, 187 AV_CODEC_ID_CSCD, 188 AV_CODEC_ID_MMVIDEO, 189 AV_CODEC_ID_ZMBV, 190 AV_CODEC_ID_AVS, 191 AV_CODEC_ID_SMACKVIDEO, 192 AV_CODEC_ID_NUV, 193 AV_CODEC_ID_KMVC, 194 AV_CODEC_ID_FLASHSV, 195 AV_CODEC_ID_CAVS, 196 AV_CODEC_ID_JPEG2000, 197 AV_CODEC_ID_VMNC, 198 AV_CODEC_ID_VP5, 199 AV_CODEC_ID_VP6, 200 AV_CODEC_ID_VP6F, 201 AV_CODEC_ID_TARGA, 202 AV_CODEC_ID_DSICINVIDEO, 203 AV_CODEC_ID_TIERTEXSEQVIDEO, 204 AV_CODEC_ID_TIFF, 205 AV_CODEC_ID_GIF, 206 AV_CODEC_ID_DXA, 207 AV_CODEC_ID_DNXHD, 208 AV_CODEC_ID_THP, 209 AV_CODEC_ID_SGI, 210 AV_CODEC_ID_C93, 211 AV_CODEC_ID_BETHSOFTVID, 212 AV_CODEC_ID_PTX, 213 AV_CODEC_ID_TXD, 214 AV_CODEC_ID_VP6A, 215 AV_CODEC_ID_AMV, 216 AV_CODEC_ID_VB, 217 AV_CODEC_ID_PCX, 218 AV_CODEC_ID_SUNRAST, 219 AV_CODEC_ID_INDEO4, 220 AV_CODEC_ID_INDEO5, 221 AV_CODEC_ID_MIMIC, 222 AV_CODEC_ID_RL2, 223 AV_CODEC_ID_ESCAPE124, 224 AV_CODEC_ID_DIRAC, 225 AV_CODEC_ID_BFI, 226 AV_CODEC_ID_CMV, 227 AV_CODEC_ID_MOTIONPIXELS, 228 AV_CODEC_ID_TGV, 229 AV_CODEC_ID_TGQ, 230 AV_CODEC_ID_TQI, 231 AV_CODEC_ID_AURA, 232 AV_CODEC_ID_AURA2, 233 AV_CODEC_ID_V210X, 234 AV_CODEC_ID_TMV, 235 AV_CODEC_ID_V210, 236 AV_CODEC_ID_DPX, 237 AV_CODEC_ID_MAD, 238 AV_CODEC_ID_FRWU, 239 AV_CODEC_ID_FLASHSV2, 240 AV_CODEC_ID_CDGRAPHICS, 241 AV_CODEC_ID_R210, 242 AV_CODEC_ID_ANM, 243 AV_CODEC_ID_BINKVIDEO, 244 AV_CODEC_ID_IFF_ILBM, 245 AV_CODEC_ID_IFF_BYTERUN1, 246 AV_CODEC_ID_KGV1, 247 AV_CODEC_ID_YOP, 248 AV_CODEC_ID_VP8, 249 AV_CODEC_ID_PICTOR, 250 AV_CODEC_ID_ANSI, 251 AV_CODEC_ID_A64_MULTI, 252 AV_CODEC_ID_A64_MULTI5, 253 AV_CODEC_ID_R10K, 254 AV_CODEC_ID_MXPEG, 255 AV_CODEC_ID_LAGARITH, 256 AV_CODEC_ID_PRORES, 257 AV_CODEC_ID_JV, 258 AV_CODEC_ID_DFA, 259 AV_CODEC_ID_WMV3IMAGE, 260 AV_CODEC_ID_VC1IMAGE, 261 AV_CODEC_ID_UTVIDEO, 262 AV_CODEC_ID_BMV_VIDEO, 263 AV_CODEC_ID_VBLE, 264 AV_CODEC_ID_DXTORY, 265 AV_CODEC_ID_V410, 266 AV_CODEC_ID_XWD, 267 AV_CODEC_ID_CDXL, 268 AV_CODEC_ID_XBM, 269 AV_CODEC_ID_ZEROCODEC, 270 AV_CODEC_ID_MSS1, 271 AV_CODEC_ID_MSA1, 272 AV_CODEC_ID_TSCC2, 273 AV_CODEC_ID_MTS2, 274 AV_CODEC_ID_CLLC, 275 AV_CODEC_ID_MSS2, 276 AV_CODEC_ID_VP9, 277 AV_CODEC_ID_AIC, 278 AV_CODEC_ID_ESCAPE130_DEPRECATED, 279 AV_CODEC_ID_G2M_DEPRECATED, 280 AV_CODEC_ID_WEBP_DEPRECATED, 281 AV_CODEC_ID_HNM4_VIDEO, 282 AV_CODEC_ID_HEVC_DEPRECATED, 283 AV_CODEC_ID_FIC, 284 AV_CODEC_ID_ALIAS_PIX, 285 AV_CODEC_ID_BRENDER_PIX_DEPRECATED, 286 AV_CODEC_ID_PAF_VIDEO_DEPRECATED, 287 AV_CODEC_ID_EXR_DEPRECATED, 288 AV_CODEC_ID_VP7_DEPRECATED, 289 AV_CODEC_ID_SANM_DEPRECATED, 290 AV_CODEC_ID_SGIRLE_DEPRECATED, 291 AV_CODEC_ID_MVC1_DEPRECATED, 292 AV_CODEC_ID_MVC2_DEPRECATED, 293 294 AV_CODEC_ID_BRENDER_PIX= MKBETAG('B','P','I','X'), 295 AV_CODEC_ID_Y41P = MKBETAG('Y','4','1','P'), 296 AV_CODEC_ID_ESCAPE130 = MKBETAG('E','1','3','0'), 297 AV_CODEC_ID_EXR = MKBETAG('0','E','X','R'), 298 AV_CODEC_ID_AVRP = MKBETAG('A','V','R','P'), 299 300 AV_CODEC_ID_012V = MKBETAG('0','1','2','V'), 301 AV_CODEC_ID_G2M = MKBETAG( 0 ,'G','2','M'), 302 AV_CODEC_ID_AVUI = MKBETAG('A','V','U','I'), 303 AV_CODEC_ID_AYUV = MKBETAG('A','Y','U','V'), 304 AV_CODEC_ID_TARGA_Y216 = MKBETAG('T','2','1','6'), 305 AV_CODEC_ID_V308 = MKBETAG('V','3','0','8'), 306 AV_CODEC_ID_V408 = MKBETAG('V','4','0','8'), 307 AV_CODEC_ID_YUV4 = MKBETAG('Y','U','V','4'), 308 AV_CODEC_ID_SANM = MKBETAG('S','A','N','M'), 309 AV_CODEC_ID_PAF_VIDEO = MKBETAG('P','A','F','V'), 310 AV_CODEC_ID_AVRN = MKBETAG('A','V','R','n'), 311 AV_CODEC_ID_CPIA = MKBETAG('C','P','I','A'), 312 AV_CODEC_ID_XFACE = MKBETAG('X','F','A','C'), 313 AV_CODEC_ID_SGIRLE = MKBETAG('S','G','I','R'), 314 AV_CODEC_ID_MVC1 = MKBETAG('M','V','C','1'), 315 AV_CODEC_ID_MVC2 = MKBETAG('M','V','C','2'), 316 AV_CODEC_ID_SNOW = MKBETAG('S','N','O','W'), 317 AV_CODEC_ID_WEBP = MKBETAG('W','E','B','P'), 318 AV_CODEC_ID_SMVJPEG = MKBETAG('S','M','V','J'), 319 AV_CODEC_ID_HEVC = MKBETAG('H','2','6','5'), 320 #define AV_CODEC_ID_H265 AV_CODEC_ID_HEVC 321 AV_CODEC_ID_VP7 = MKBETAG('V','P','7','0'), 322 323 /* various PCM "codecs" */ 324 AV_CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs 325 AV_CODEC_ID_PCM_S16LE = 0x10000, 326 AV_CODEC_ID_PCM_S16BE, 327 AV_CODEC_ID_PCM_U16LE, 328 AV_CODEC_ID_PCM_U16BE, 329 AV_CODEC_ID_PCM_S8, 330 AV_CODEC_ID_PCM_U8, 331 AV_CODEC_ID_PCM_MULAW, 332 AV_CODEC_ID_PCM_ALAW, 333 AV_CODEC_ID_PCM_S32LE, 334 AV_CODEC_ID_PCM_S32BE, 335 AV_CODEC_ID_PCM_U32LE, 336 AV_CODEC_ID_PCM_U32BE, 337 AV_CODEC_ID_PCM_S24LE, 338 AV_CODEC_ID_PCM_S24BE, 339 AV_CODEC_ID_PCM_U24LE, 340 AV_CODEC_ID_PCM_U24BE, 341 AV_CODEC_ID_PCM_S24DAUD, 342 AV_CODEC_ID_PCM_ZORK, 343 AV_CODEC_ID_PCM_S16LE_PLANAR, 344 AV_CODEC_ID_PCM_DVD, 345 AV_CODEC_ID_PCM_F32BE, 346 AV_CODEC_ID_PCM_F32LE, 347 AV_CODEC_ID_PCM_F64BE, 348 AV_CODEC_ID_PCM_F64LE, 349 AV_CODEC_ID_PCM_BLURAY, 350 AV_CODEC_ID_PCM_LXF, 351 AV_CODEC_ID_S302M, 352 AV_CODEC_ID_PCM_S8_PLANAR, 353 AV_CODEC_ID_PCM_S24LE_PLANAR_DEPRECATED, 354 AV_CODEC_ID_PCM_S32LE_PLANAR_DEPRECATED, 355 AV_CODEC_ID_PCM_S24LE_PLANAR = MKBETAG(24,'P','S','P'), 356 AV_CODEC_ID_PCM_S32LE_PLANAR = MKBETAG(32,'P','S','P'), 357 AV_CODEC_ID_PCM_S16BE_PLANAR = MKBETAG('P','S','P',16), 358 359 /* various ADPCM codecs */ 360 AV_CODEC_ID_ADPCM_IMA_QT = 0x11000, 361 AV_CODEC_ID_ADPCM_IMA_WAV, 362 AV_CODEC_ID_ADPCM_IMA_DK3, 363 AV_CODEC_ID_ADPCM_IMA_DK4, 364 AV_CODEC_ID_ADPCM_IMA_WS, 365 AV_CODEC_ID_ADPCM_IMA_SMJPEG, 366 AV_CODEC_ID_ADPCM_MS, 367 AV_CODEC_ID_ADPCM_4XM, 368 AV_CODEC_ID_ADPCM_XA, 369 AV_CODEC_ID_ADPCM_ADX, 370 AV_CODEC_ID_ADPCM_EA, 371 AV_CODEC_ID_ADPCM_G726, 372 AV_CODEC_ID_ADPCM_CT, 373 AV_CODEC_ID_ADPCM_SWF, 374 AV_CODEC_ID_ADPCM_YAMAHA, 375 AV_CODEC_ID_ADPCM_SBPRO_4, 376 AV_CODEC_ID_ADPCM_SBPRO_3, 377 AV_CODEC_ID_ADPCM_SBPRO_2, 378 AV_CODEC_ID_ADPCM_THP, 379 AV_CODEC_ID_ADPCM_IMA_AMV, 380 AV_CODEC_ID_ADPCM_EA_R1, 381 AV_CODEC_ID_ADPCM_EA_R3, 382 AV_CODEC_ID_ADPCM_EA_R2, 383 AV_CODEC_ID_ADPCM_IMA_EA_SEAD, 384 AV_CODEC_ID_ADPCM_IMA_EA_EACS, 385 AV_CODEC_ID_ADPCM_EA_XAS, 386 AV_CODEC_ID_ADPCM_EA_MAXIS_XA, 387 AV_CODEC_ID_ADPCM_IMA_ISS, 388 AV_CODEC_ID_ADPCM_G722, 389 AV_CODEC_ID_ADPCM_IMA_APC, 390 AV_CODEC_ID_ADPCM_VIMA_DEPRECATED, 391 AV_CODEC_ID_ADPCM_VIMA = MKBETAG('V','I','M','A'), 392 AV_CODEC_ID_VIMA = MKBETAG('V','I','M','A'), 393 AV_CODEC_ID_ADPCM_AFC = MKBETAG('A','F','C',' '), 394 AV_CODEC_ID_ADPCM_IMA_OKI = MKBETAG('O','K','I',' '), 395 AV_CODEC_ID_ADPCM_DTK = MKBETAG('D','T','K',' '), 396 AV_CODEC_ID_ADPCM_IMA_RAD = MKBETAG('R','A','D',' '), 397 AV_CODEC_ID_ADPCM_G726LE = MKBETAG('6','2','7','G'), 398 399 /* AMR */ 400 AV_CODEC_ID_AMR_NB = 0x12000, 401 AV_CODEC_ID_AMR_WB, 402 403 /* RealAudio codecs*/ 404 AV_CODEC_ID_RA_144 = 0x13000, 405 AV_CODEC_ID_RA_288, 406 407 /* various DPCM codecs */ 408 AV_CODEC_ID_ROQ_DPCM = 0x14000, 409 AV_CODEC_ID_INTERPLAY_DPCM, 410 AV_CODEC_ID_XAN_DPCM, 411 AV_CODEC_ID_SOL_DPCM, 412 413 /* audio codecs */ 414 AV_CODEC_ID_MP2 = 0x15000, 415 AV_CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3 416 AV_CODEC_ID_AAC, 417 AV_CODEC_ID_AC3, 418 AV_CODEC_ID_DTS, 419 AV_CODEC_ID_VORBIS, 420 AV_CODEC_ID_DVAUDIO, 421 AV_CODEC_ID_WMAV1, 422 AV_CODEC_ID_WMAV2, 423 AV_CODEC_ID_MACE3, 424 AV_CODEC_ID_MACE6, 425 AV_CODEC_ID_VMDAUDIO, 426 AV_CODEC_ID_FLAC, 427 AV_CODEC_ID_MP3ADU, 428 AV_CODEC_ID_MP3ON4, 429 AV_CODEC_ID_SHORTEN, 430 AV_CODEC_ID_ALAC, 431 AV_CODEC_ID_WESTWOOD_SND1, 432 AV_CODEC_ID_GSM, ///< as in Berlin toast format 433 AV_CODEC_ID_QDM2, 434 AV_CODEC_ID_COOK, 435 AV_CODEC_ID_TRUESPEECH, 436 AV_CODEC_ID_TTA, 437 AV_CODEC_ID_SMACKAUDIO, 438 AV_CODEC_ID_QCELP, 439 AV_CODEC_ID_WAVPACK, 440 AV_CODEC_ID_DSICINAUDIO, 441 AV_CODEC_ID_IMC, 442 AV_CODEC_ID_MUSEPACK7, 443 AV_CODEC_ID_MLP, 444 AV_CODEC_ID_GSM_MS, /* as found in WAV */ 445 AV_CODEC_ID_ATRAC3, 446 #if FF_API_VOXWARE 447 AV_CODEC_ID_VOXWARE, 448 #endif 449 AV_CODEC_ID_APE, 450 AV_CODEC_ID_NELLYMOSER, 451 AV_CODEC_ID_MUSEPACK8, 452 AV_CODEC_ID_SPEEX, 453 AV_CODEC_ID_WMAVOICE, 454 AV_CODEC_ID_WMAPRO, 455 AV_CODEC_ID_WMALOSSLESS, 456 AV_CODEC_ID_ATRAC3P, 457 AV_CODEC_ID_EAC3, 458 AV_CODEC_ID_SIPR, 459 AV_CODEC_ID_MP1, 460 AV_CODEC_ID_TWINVQ, 461 AV_CODEC_ID_TRUEHD, 462 AV_CODEC_ID_MP4ALS, 463 AV_CODEC_ID_ATRAC1, 464 AV_CODEC_ID_BINKAUDIO_RDFT, 465 AV_CODEC_ID_BINKAUDIO_DCT, 466 AV_CODEC_ID_AAC_LATM, 467 AV_CODEC_ID_QDMC, 468 AV_CODEC_ID_CELT, 469 AV_CODEC_ID_G723_1, 470 AV_CODEC_ID_G729, 471 AV_CODEC_ID_8SVX_EXP, 472 AV_CODEC_ID_8SVX_FIB, 473 AV_CODEC_ID_BMV_AUDIO, 474 AV_CODEC_ID_RALF, 475 AV_CODEC_ID_IAC, 476 AV_CODEC_ID_ILBC, 477 AV_CODEC_ID_OPUS_DEPRECATED, 478 AV_CODEC_ID_COMFORT_NOISE, 479 AV_CODEC_ID_TAK_DEPRECATED, 480 AV_CODEC_ID_METASOUND, 481 AV_CODEC_ID_PAF_AUDIO_DEPRECATED, 482 AV_CODEC_ID_ON2AVC, 483 AV_CODEC_ID_FFWAVESYNTH = MKBETAG('F','F','W','S'), 484 AV_CODEC_ID_SONIC = MKBETAG('S','O','N','C'), 485 AV_CODEC_ID_SONIC_LS = MKBETAG('S','O','N','L'), 486 AV_CODEC_ID_PAF_AUDIO = MKBETAG('P','A','F','A'), 487 AV_CODEC_ID_OPUS = MKBETAG('O','P','U','S'), 488 AV_CODEC_ID_TAK = MKBETAG('t','B','a','K'), 489 AV_CODEC_ID_EVRC = MKBETAG('s','e','v','c'), 490 AV_CODEC_ID_SMV = MKBETAG('s','s','m','v'), 491 AV_CODEC_ID_DSD_LSBF = MKBETAG('D','S','D','L'), 492 AV_CODEC_ID_DSD_MSBF = MKBETAG('D','S','D','M'), 493 AV_CODEC_ID_DSD_LSBF_PLANAR = MKBETAG('D','S','D','1'), 494 AV_CODEC_ID_DSD_MSBF_PLANAR = MKBETAG('D','S','D','8'), 495 496 /* subtitle codecs */ 497 AV_CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs. 498 AV_CODEC_ID_DVD_SUBTITLE = 0x17000, 499 AV_CODEC_ID_DVB_SUBTITLE, 500 AV_CODEC_ID_TEXT, ///< raw UTF-8 text 501 AV_CODEC_ID_XSUB, 502 AV_CODEC_ID_SSA, 503 AV_CODEC_ID_MOV_TEXT, 504 AV_CODEC_ID_HDMV_PGS_SUBTITLE, 505 AV_CODEC_ID_DVB_TELETEXT, 506 AV_CODEC_ID_SRT, 507 AV_CODEC_ID_MICRODVD = MKBETAG('m','D','V','D'), 508 AV_CODEC_ID_EIA_608 = MKBETAG('c','6','0','8'), 509 AV_CODEC_ID_JACOSUB = MKBETAG('J','S','U','B'), 510 AV_CODEC_ID_SAMI = MKBETAG('S','A','M','I'), 511 AV_CODEC_ID_REALTEXT = MKBETAG('R','T','X','T'), 512 AV_CODEC_ID_STL = MKBETAG('S','p','T','L'), 513 AV_CODEC_ID_SUBVIEWER1 = MKBETAG('S','b','V','1'), 514 AV_CODEC_ID_SUBVIEWER = MKBETAG('S','u','b','V'), 515 AV_CODEC_ID_SUBRIP = MKBETAG('S','R','i','p'), 516 AV_CODEC_ID_WEBVTT = MKBETAG('W','V','T','T'), 517 AV_CODEC_ID_MPL2 = MKBETAG('M','P','L','2'), 518 AV_CODEC_ID_VPLAYER = MKBETAG('V','P','l','r'), 519 AV_CODEC_ID_PJS = MKBETAG('P','h','J','S'), 520 AV_CODEC_ID_ASS = MKBETAG('A','S','S',' '), ///< ASS as defined in Matroska 521 522 /* other specific kind of codecs (generally used for attachments) */ 523 AV_CODEC_ID_FIRST_UNKNOWN = 0x18000, ///< A dummy ID pointing at the start of various fake codecs. 524 AV_CODEC_ID_TTF = 0x18000, 525 AV_CODEC_ID_BINTEXT = MKBETAG('B','T','X','T'), 526 AV_CODEC_ID_XBIN = MKBETAG('X','B','I','N'), 527 AV_CODEC_ID_IDF = MKBETAG( 0 ,'I','D','F'), 528 AV_CODEC_ID_OTF = MKBETAG( 0 ,'O','T','F'), 529 AV_CODEC_ID_SMPTE_KLV = MKBETAG('K','L','V','A'), 530 AV_CODEC_ID_DVD_NAV = MKBETAG('D','N','A','V'), 531 AV_CODEC_ID_TIMED_ID3 = MKBETAG('T','I','D','3'), 532 AV_CODEC_ID_BIN_DATA = MKBETAG('D','A','T','A'), 533 534 535 AV_CODEC_ID_PROBE = 0x19000, ///< codec_id is not known (like AV_CODEC_ID_NONE) but lavf should attempt to identify it 536 537 AV_CODEC_ID_MPEG2TS = 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS 538 * stream (only used by libavformat) */ 539 AV_CODEC_ID_MPEG4SYSTEMS = 0x20001, /**< _FAKE_ codec to indicate a MPEG-4 Systems 540 * stream (only used by libavformat) */ 541 AV_CODEC_ID_FFMETADATA = 0x21000, ///< Dummy codec for streams containing only metadata information. 542 543 #if FF_API_CODEC_ID 544 #include "old_codec_ids.h" 545 #endif 546 }; 547 548 /** 549 * This struct describes the properties of a single codec described by an 550 * AVCodecID. 551 * @see avcodec_descriptor_get() 552 */ 553 typedef struct AVCodecDescriptor { 554 enum AVCodecID id; 555 enum AVMediaType type; 556 /** 557 * Name of the codec described by this descriptor. It is non-empty and 558 * unique for each codec descriptor. It should contain alphanumeric 559 * characters and '_' only. 560 */ 561 const char *name; 562 /** 563 * A more descriptive name for this codec. May be NULL. 564 */ 565 const char *long_name; 566 /** 567 * Codec properties, a combination of AV_CODEC_PROP_* flags. 568 */ 569 int props; 570 571 /** 572 * MIME type(s) associated with the codec. 573 * May be NULL; if not, a NULL-terminated array of MIME types. 574 * The first item is always non-NULL and is the preferred MIME type. 575 */ 576 const char *const *mime_types; 577 } AVCodecDescriptor; 578 579 /** 580 * Codec uses only intra compression. 581 * Video codecs only. 582 */ 583 #define AV_CODEC_PROP_INTRA_ONLY (1 << 0) 584 /** 585 * Codec supports lossy compression. Audio and video codecs only. 586 * @note a codec may support both lossy and lossless 587 * compression modes 588 */ 589 #define AV_CODEC_PROP_LOSSY (1 << 1) 590 /** 591 * Codec supports lossless compression. Audio and video codecs only. 592 */ 593 #define AV_CODEC_PROP_LOSSLESS (1 << 2) 594 /** 595 * Codec supports frame reordering. That is, the coded order (the order in which 596 * the encoded packets are output by the encoders / stored / input to the 597 * decoders) may be different from the presentation order of the corresponding 598 * frames. 599 * 600 * For codecs that do not have this property set, PTS and DTS should always be 601 * equal. 602 */ 603 #define AV_CODEC_PROP_REORDER (1 << 3) 604 /** 605 * Subtitle codec is bitmap based 606 * Decoded AVSubtitle data can be read from the AVSubtitleRect->pict field. 607 */ 608 #define AV_CODEC_PROP_BITMAP_SUB (1 << 16) 609 /** 610 * Subtitle codec is text based. 611 * Decoded AVSubtitle data can be read from the AVSubtitleRect->ass field. 612 */ 613 #define AV_CODEC_PROP_TEXT_SUB (1 << 17) 614 615 /** 616 * @ingroup lavc_decoding 617 * Required number of additionally allocated bytes at the end of the input bitstream for decoding. 618 * This is mainly needed because some optimized bitstream readers read 619 * 32 or 64 bit at once and could read over the end.<br> 620 * Note: If the first 23 bits of the additional bytes are not 0, then damaged 621 * MPEG bitstreams could cause overread and segfault. 622 */ 623 #define FF_INPUT_BUFFER_PADDING_SIZE 32 624 625 /** 626 * @ingroup lavc_encoding 627 * minimum encoding buffer size 628 * Used to avoid some checks during header writing. 629 */ 630 #define FF_MIN_BUFFER_SIZE 16384 631 632 633 /** 634 * @ingroup lavc_encoding 635 * motion estimation type. 636 */ 637 enum Motion_Est_ID { 638 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed 639 ME_FULL, 640 ME_LOG, 641 ME_PHODS, 642 ME_EPZS, ///< enhanced predictive zonal search 643 ME_X1, ///< reserved for experiments 644 ME_HEX, ///< hexagon based search 645 ME_UMH, ///< uneven multi-hexagon search 646 ME_TESA, ///< transformed exhaustive search algorithm 647 ME_ITER=50, ///< iterative search 648 }; 649 650 /** 651 * @ingroup lavc_decoding 652 */ 653 enum AVDiscard{ 654 /* We leave some space between them for extensions (drop some 655 * keyframes for intra-only or drop just some bidir frames). */ 656 AVDISCARD_NONE =-16, ///< discard nothing 657 AVDISCARD_DEFAULT = 0, ///< discard useless packets like 0 size packets in avi 658 AVDISCARD_NONREF = 8, ///< discard all non reference 659 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames 660 AVDISCARD_NONINTRA= 24, ///< discard all non intra frames 661 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes 662 AVDISCARD_ALL = 48, ///< discard all 663 }; 664 665 enum AVAudioServiceType { 666 AV_AUDIO_SERVICE_TYPE_MAIN = 0, 667 AV_AUDIO_SERVICE_TYPE_EFFECTS = 1, 668 AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2, 669 AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED = 3, 670 AV_AUDIO_SERVICE_TYPE_DIALOGUE = 4, 671 AV_AUDIO_SERVICE_TYPE_COMMENTARY = 5, 672 AV_AUDIO_SERVICE_TYPE_EMERGENCY = 6, 673 AV_AUDIO_SERVICE_TYPE_VOICE_OVER = 7, 674 AV_AUDIO_SERVICE_TYPE_KARAOKE = 8, 675 AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI 676 }; 677 678 /** 679 * @ingroup lavc_encoding 680 */ 681 typedef struct RcOverride{ 682 int start_frame; 683 int end_frame; 684 int qscale; // If this is 0 then quality_factor will be used instead. 685 float quality_factor; 686 } RcOverride; 687 688 #if FF_API_MAX_BFRAMES 689 /** 690 * @deprecated there is no libavcodec-wide limit on the number of B-frames 691 */ 692 #define FF_MAX_B_FRAMES 16 693 #endif 694 695 /* encoding support 696 These flags can be passed in AVCodecContext.flags before initialization. 697 Note: Not everything is supported yet. 698 */ 699 700 /** 701 * Allow decoders to produce frames with data planes that are not aligned 702 * to CPU requirements (e.g. due to cropping). 703 */ 704 #define CODEC_FLAG_UNALIGNED 0x0001 705 #define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale. 706 #define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263. 707 #define CODEC_FLAG_OUTPUT_CORRUPT 0x0008 ///< Output even those frames that might be corrupted 708 #define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC. 709 #if FF_API_GMC 710 /** 711 * @deprecated use the "gmc" private option of the libxvid encoder 712 */ 713 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC. 714 #endif 715 #if FF_API_MV0 716 /** 717 * @deprecated use the flag "mv0" in the "mpv_flags" private option of the 718 * mpegvideo encoders 719 */ 720 #define CODEC_FLAG_MV0 0x0040 721 #endif 722 #if FF_API_INPUT_PRESERVED 723 /** 724 * @deprecated passing reference-counted frames to the encoders replaces this 725 * flag 726 */ 727 #define CODEC_FLAG_INPUT_PRESERVED 0x0100 728 #endif 729 #define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode. 730 #define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode. 731 #define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale. 732 #if FF_API_EMU_EDGE 733 /** 734 * @deprecated edges are not used/required anymore. I.e. this flag is now always 735 * set. 736 */ 737 #define CODEC_FLAG_EMU_EDGE 0x4000 738 #endif 739 #define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding. 740 #define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random 741 location instead of only at frame boundaries. */ 742 #if FF_API_NORMALIZE_AQP 743 /** 744 * @deprecated use the flag "naq" in the "mpv_flags" private option of the 745 * mpegvideo encoders 746 */ 747 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000 748 #endif 749 #define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT. 750 #define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay. 751 #define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe. 752 #define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT). 753 /* Fx : Flag for h263+ extra options */ 754 #define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction 755 #define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter 756 #define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation 757 #define CODEC_FLAG_CLOSED_GOP 0x80000000 758 #define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks. 759 #define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding. 760 #define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata. 761 #define CODEC_FLAG2_DROP_FRAME_TIMECODE 0x00002000 ///< timecode is in drop frame format. DEPRECATED!!!! 762 #define CODEC_FLAG2_IGNORE_CROP 0x00010000 ///< Discard cropping information from SPS. 763 764 #define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries. 765 #define CODEC_FLAG2_SHOW_ALL 0x00400000 ///< Show all frames before the first keyframe 766 #define CODEC_FLAG2_EXPORT_MVS 0x10000000 ///< Export motion vectors through frame side data 767 #define CODEC_FLAG2_SKIP_MANUAL 0x20000000 ///< Do not skip samples and export skip information as frame side data 768 769 /* Unsupported options : 770 * Syntax Arithmetic coding (SAC) 771 * Reference Picture Selection 772 * Independent Segment Decoding */ 773 /* /Fx */ 774 /* codec capabilities */ 775 776 #define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback. 777 /** 778 * Codec uses get_buffer() for allocating buffers and supports custom allocators. 779 * If not set, it might not use get_buffer() at all or use operations that 780 * assume the buffer was allocated by avcodec_default_get_buffer. 781 */ 782 #define CODEC_CAP_DR1 0x0002 783 #define CODEC_CAP_TRUNCATED 0x0008 784 #if FF_API_XVMC 785 /* Codec can export data for HW decoding. This flag indicates that 786 * the codec would call get_format() with list that might contain HW accelerated 787 * pixel formats (XvMC, VDPAU, VAAPI, etc). The application can pick any of them 788 * including raw image format. 789 * The application can use the passed context to determine bitstream version, 790 * chroma format, resolution etc. 791 */ 792 #define CODEC_CAP_HWACCEL 0x0010 793 #endif /* FF_API_XVMC */ 794 /** 795 * Encoder or decoder requires flushing with NULL input at the end in order to 796 * give the complete and correct output. 797 * 798 * NOTE: If this flag is not set, the codec is guaranteed to never be fed with 799 * with NULL data. The user can still send NULL data to the public encode 800 * or decode function, but libavcodec will not pass it along to the codec 801 * unless this flag is set. 802 * 803 * Decoders: 804 * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL, 805 * avpkt->size=0 at the end to get the delayed data until the decoder no longer 806 * returns frames. 807 * 808 * Encoders: 809 * The encoder needs to be fed with NULL data at the end of encoding until the 810 * encoder no longer returns data. 811 * 812 * NOTE: For encoders implementing the AVCodec.encode2() function, setting this 813 * flag also means that the encoder must set the pts and duration for 814 * each output packet. If this flag is not set, the pts and duration will 815 * be determined by libavcodec from the input frame. 816 */ 817 #define CODEC_CAP_DELAY 0x0020 818 /** 819 * Codec can be fed a final frame with a smaller size. 820 * This can be used to prevent truncation of the last audio samples. 821 */ 822 #define CODEC_CAP_SMALL_LAST_FRAME 0x0040 823 #if FF_API_CAP_VDPAU 824 /** 825 * Codec can export data for HW decoding (VDPAU). 826 */ 827 #define CODEC_CAP_HWACCEL_VDPAU 0x0080 828 #endif 829 /** 830 * Codec can output multiple frames per AVPacket 831 * Normally demuxers return one frame at a time, demuxers which do not do 832 * are connected to a parser to split what they return into proper frames. 833 * This flag is reserved to the very rare category of codecs which have a 834 * bitstream that cannot be split into frames without timeconsuming 835 * operations like full decoding. Demuxers carring such bitstreams thus 836 * may return multiple frames in a packet. This has many disadvantages like 837 * prohibiting stream copy in many cases thus it should only be considered 838 * as a last resort. 839 */ 840 #define CODEC_CAP_SUBFRAMES 0x0100 841 /** 842 * Codec is experimental and is thus avoided in favor of non experimental 843 * encoders 844 */ 845 #define CODEC_CAP_EXPERIMENTAL 0x0200 846 /** 847 * Codec should fill in channel configuration and samplerate instead of container 848 */ 849 #define CODEC_CAP_CHANNEL_CONF 0x0400 850 #if FF_API_NEG_LINESIZES 851 /** 852 * @deprecated no codecs use this capability 853 */ 854 #define CODEC_CAP_NEG_LINESIZES 0x0800 855 #endif 856 /** 857 * Codec supports frame-level multithreading. 858 */ 859 #define CODEC_CAP_FRAME_THREADS 0x1000 860 /** 861 * Codec supports slice-based (or partition-based) multithreading. 862 */ 863 #define CODEC_CAP_SLICE_THREADS 0x2000 864 /** 865 * Codec supports changed parameters at any point. 866 */ 867 #define CODEC_CAP_PARAM_CHANGE 0x4000 868 /** 869 * Codec supports avctx->thread_count == 0 (auto). 870 */ 871 #define CODEC_CAP_AUTO_THREADS 0x8000 872 /** 873 * Audio encoder supports receiving a different number of samples in each call. 874 */ 875 #define CODEC_CAP_VARIABLE_FRAME_SIZE 0x10000 876 /** 877 * Codec is intra only. 878 */ 879 #define CODEC_CAP_INTRA_ONLY 0x40000000 880 /** 881 * Codec is lossless. 882 */ 883 #define CODEC_CAP_LOSSLESS 0x80000000 884 885 #if FF_API_MB_TYPE 886 //The following defines may change, don't expect compatibility if you use them. 887 #define MB_TYPE_INTRA4x4 0x0001 888 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific 889 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific 890 #define MB_TYPE_16x16 0x0008 891 #define MB_TYPE_16x8 0x0010 892 #define MB_TYPE_8x16 0x0020 893 #define MB_TYPE_8x8 0x0040 894 #define MB_TYPE_INTERLACED 0x0080 895 #define MB_TYPE_DIRECT2 0x0100 //FIXME 896 #define MB_TYPE_ACPRED 0x0200 897 #define MB_TYPE_GMC 0x0400 898 #define MB_TYPE_SKIP 0x0800 899 #define MB_TYPE_P0L0 0x1000 900 #define MB_TYPE_P1L0 0x2000 901 #define MB_TYPE_P0L1 0x4000 902 #define MB_TYPE_P1L1 0x8000 903 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0) 904 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1) 905 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1) 906 #define MB_TYPE_QUANT 0x00010000 907 #define MB_TYPE_CBP 0x00020000 908 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...) 909 #endif 910 911 /** 912 * Pan Scan area. 913 * This specifies the area which should be displayed. 914 * Note there may be multiple such areas for one frame. 915 */ 916 typedef struct AVPanScan{ 917 /** 918 * id 919 * - encoding: Set by user. 920 * - decoding: Set by libavcodec. 921 */ 922 int id; 923 924 /** 925 * width and height in 1/16 pel 926 * - encoding: Set by user. 927 * - decoding: Set by libavcodec. 928 */ 929 int width; 930 int height; 931 932 /** 933 * position of the top left corner in 1/16 pel for up to 3 fields/frames 934 * - encoding: Set by user. 935 * - decoding: Set by libavcodec. 936 */ 937 int16_t position[3][2]; 938 }AVPanScan; 939 940 #if FF_API_QSCALE_TYPE 941 #define FF_QSCALE_TYPE_MPEG1 0 942 #define FF_QSCALE_TYPE_MPEG2 1 943 #define FF_QSCALE_TYPE_H264 2 944 #define FF_QSCALE_TYPE_VP56 3 945 #endif 946 947 #if FF_API_GET_BUFFER 948 #define FF_BUFFER_TYPE_INTERNAL 1 949 #define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user) 950 #define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared. 951 #define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything. 952 953 #define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore). 954 #define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer. 955 #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content. 956 #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update). 957 #endif 958 959 /** 960 * The decoder will keep a reference to the frame and may reuse it later. 961 */ 962 #define AV_GET_BUFFER_FLAG_REF (1 << 0) 963 964 /** 965 * @defgroup lavc_packet AVPacket 966 * 967 * Types and functions for working with AVPacket. 968 * @{ 969 */ 970 enum AVPacketSideDataType { 971 AV_PKT_DATA_PALETTE, 972 AV_PKT_DATA_NEW_EXTRADATA, 973 974 /** 975 * An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows: 976 * @code 977 * u32le param_flags 978 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT) 979 * s32le channel_count 980 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT) 981 * u64le channel_layout 982 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE) 983 * s32le sample_rate 984 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS) 985 * s32le width 986 * s32le height 987 * @endcode 988 */ 989 AV_PKT_DATA_PARAM_CHANGE, 990 991 /** 992 * An AV_PKT_DATA_H263_MB_INFO side data packet contains a number of 993 * structures with info about macroblocks relevant to splitting the 994 * packet into smaller packets on macroblock edges (e.g. as for RFC 2190). 995 * That is, it does not necessarily contain info about all macroblocks, 996 * as long as the distance between macroblocks in the info is smaller 997 * than the target payload size. 998 * Each MB info structure is 12 bytes, and is laid out as follows: 999 * @code 1000 * u32le bit offset from the start of the packet 1001 * u8 current quantizer at the start of the macroblock 1002 * u8 GOB number 1003 * u16le macroblock address within the GOB 1004 * u8 horizontal MV predictor 1005 * u8 vertical MV predictor 1006 * u8 horizontal MV predictor for block number 3 1007 * u8 vertical MV predictor for block number 3 1008 * @endcode 1009 */ 1010 AV_PKT_DATA_H263_MB_INFO, 1011 1012 /** 1013 * This side data should be associated with an audio stream and contains 1014 * ReplayGain information in form of the AVReplayGain struct. 1015 */ 1016 AV_PKT_DATA_REPLAYGAIN, 1017 1018 /** 1019 * This side data contains a 3x3 transformation matrix describing an affine 1020 * transformation that needs to be applied to the decoded video frames for 1021 * correct presentation. 1022 * 1023 * See libavutil/display.h for a detailed description of the data. 1024 */ 1025 AV_PKT_DATA_DISPLAYMATRIX, 1026 1027 /** 1028 * This side data should be associated with a video stream and contains 1029 * Stereoscopic 3D information in form of the AVStereo3D struct. 1030 */ 1031 AV_PKT_DATA_STEREO3D, 1032 1033 /** 1034 * Recommmends skipping the specified number of samples 1035 * @code 1036 * u32le number of samples to skip from start of this packet 1037 * u32le number of samples to skip from end of this packet 1038 * u8 reason for start skip 1039 * u8 reason for end skip (0=padding silence, 1=convergence) 1040 * @endcode 1041 */ 1042 AV_PKT_DATA_SKIP_SAMPLES=70, 1043 1044 /** 1045 * An AV_PKT_DATA_JP_DUALMONO side data packet indicates that 1046 * the packet may contain "dual mono" audio specific to Japanese DTV 1047 * and if it is true, recommends only the selected channel to be used. 1048 * @code 1049 * u8 selected channels (0=mail/left, 1=sub/right, 2=both) 1050 * @endcode 1051 */ 1052 AV_PKT_DATA_JP_DUALMONO, 1053 1054 /** 1055 * A list of zero terminated key/value strings. There is no end marker for 1056 * the list, so it is required to rely on the side data size to stop. 1057 */ 1058 AV_PKT_DATA_STRINGS_METADATA, 1059 1060 /** 1061 * Subtitle event position 1062 * @code 1063 * u32le x1 1064 * u32le y1 1065 * u32le x2 1066 * u32le y2 1067 * @endcode 1068 */ 1069 AV_PKT_DATA_SUBTITLE_POSITION, 1070 1071 /** 1072 * Data found in BlockAdditional element of matroska container. There is 1073 * no end marker for the data, so it is required to rely on the side data 1074 * size to recognize the end. 8 byte id (as found in BlockAddId) followed 1075 * by data. 1076 */ 1077 AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL, 1078 1079 /** 1080 * The optional first identifier line of a WebVTT cue. 1081 */ 1082 AV_PKT_DATA_WEBVTT_IDENTIFIER, 1083 1084 /** 1085 * The optional settings (rendering instructions) that immediately 1086 * follow the timestamp specifier of a WebVTT cue. 1087 */ 1088 AV_PKT_DATA_WEBVTT_SETTINGS, 1089 1090 /** 1091 * A list of zero terminated key/value strings. There is no end marker for 1092 * the list, so it is required to rely on the side data size to stop. This 1093 * side data includes updated metadata which appeared in the stream. 1094 */ 1095 AV_PKT_DATA_METADATA_UPDATE, 1096 }; 1097 1098 typedef struct AVPacketSideData { 1099 uint8_t *data; 1100 int size; 1101 enum AVPacketSideDataType type; 1102 } AVPacketSideData; 1103 1104 /** 1105 * This structure stores compressed data. It is typically exported by demuxers 1106 * and then passed as input to decoders, or received as output from encoders and 1107 * then passed to muxers. 1108 * 1109 * For video, it should typically contain one compressed frame. For audio it may 1110 * contain several compressed frames. 1111 * 1112 * AVPacket is one of the few structs in FFmpeg, whose size is a part of public 1113 * ABI. Thus it may be allocated on stack and no new fields can be added to it 1114 * without libavcodec and libavformat major bump. 1115 * 1116 * The semantics of data ownership depends on the buf or destruct (deprecated) 1117 * fields. If either is set, the packet data is dynamically allocated and is 1118 * valid indefinitely until av_free_packet() is called (which in turn calls 1119 * av_buffer_unref()/the destruct callback to free the data). If neither is set, 1120 * the packet data is typically backed by some static buffer somewhere and is 1121 * only valid for a limited time (e.g. until the next read call when demuxing). 1122 * 1123 * The side data is always allocated with av_malloc() and is freed in 1124 * av_free_packet(). 1125 */ 1126 typedef struct AVPacket { 1127 /** 1128 * A reference to the reference-counted buffer where the packet data is 1129 * stored. 1130 * May be NULL, then the packet data is not reference-counted. 1131 */ 1132 AVBufferRef *buf; 1133 /** 1134 * Presentation timestamp in AVStream->time_base units; the time at which 1135 * the decompressed packet will be presented to the user. 1136 * Can be AV_NOPTS_VALUE if it is not stored in the file. 1137 * pts MUST be larger or equal to dts as presentation cannot happen before 1138 * decompression, unless one wants to view hex dumps. Some formats misuse 1139 * the terms dts and pts/cts to mean something different. Such timestamps 1140 * must be converted to true pts/dts before they are stored in AVPacket. 1141 */ 1142 int64_t pts; 1143 /** 1144 * Decompression timestamp in AVStream->time_base units; the time at which 1145 * the packet is decompressed. 1146 * Can be AV_NOPTS_VALUE if it is not stored in the file. 1147 */ 1148 int64_t dts; 1149 uint8_t *data; 1150 int size; 1151 int stream_index; 1152 /** 1153 * A combination of AV_PKT_FLAG values 1154 */ 1155 int flags; 1156 /** 1157 * Additional packet data that can be provided by the container. 1158 * Packet can contain several types of side information. 1159 */ 1160 AVPacketSideData *side_data; 1161 int side_data_elems; 1162 1163 /** 1164 * Duration of this packet in AVStream->time_base units, 0 if unknown. 1165 * Equals next_pts - this_pts in presentation order. 1166 */ 1167 int duration; 1168 #if FF_API_DESTRUCT_PACKET 1169 attribute_deprecated 1170 void (*destruct)(struct AVPacket *); 1171 attribute_deprecated 1172 void *priv; 1173 #endif 1174 int64_t pos; ///< byte position in stream, -1 if unknown 1175 1176 /** 1177 * Time difference in AVStream->time_base units from the pts of this 1178 * packet to the point at which the output from the decoder has converged 1179 * independent from the availability of previous frames. That is, the 1180 * frames are virtually identical no matter if decoding started from 1181 * the very first frame or from this keyframe. 1182 * Is AV_NOPTS_VALUE if unknown. 1183 * This field is not the display duration of the current packet. 1184 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY 1185 * set. 1186 * 1187 * The purpose of this field is to allow seeking in streams that have no 1188 * keyframes in the conventional sense. It corresponds to the 1189 * recovery point SEI in H.264 and match_time_delta in NUT. It is also 1190 * essential for some types of subtitle streams to ensure that all 1191 * subtitles are correctly displayed after seeking. 1192 */ 1193 int64_t convergence_duration; 1194 } AVPacket; 1195 #define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe 1196 #define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted 1197 1198 enum AVSideDataParamChangeFlags { 1199 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT = 0x0001, 1200 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT = 0x0002, 1201 AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE = 0x0004, 1202 AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS = 0x0008, 1203 }; 1204 /** 1205 * @} 1206 */ 1207 1208 struct AVCodecInternal; 1209 1210 enum AVFieldOrder { 1211 AV_FIELD_UNKNOWN, 1212 AV_FIELD_PROGRESSIVE, 1213 AV_FIELD_TT, //< Top coded_first, top displayed first 1214 AV_FIELD_BB, //< Bottom coded first, bottom displayed first 1215 AV_FIELD_TB, //< Top coded first, bottom displayed first 1216 AV_FIELD_BT, //< Bottom coded first, top displayed first 1217 }; 1218 1219 /** 1220 * main external API structure. 1221 * New fields can be added to the end with minor version bumps. 1222 * Removal, reordering and changes to existing fields require a major 1223 * version bump. 1224 * Please use AVOptions (av_opt* / av_set/get*()) to access these fields from user 1225 * applications. 1226 * sizeof(AVCodecContext) must not be used outside libav*. 1227 */ 1228 typedef struct AVCodecContext { 1229 /** 1230 * information on struct for av_log 1231 * - set by avcodec_alloc_context3 1232 */ 1233 const AVClass *av_class; 1234 int log_level_offset; 1235 1236 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */ 1237 const struct AVCodec *codec; 1238 #if FF_API_CODEC_NAME 1239 /** 1240 * @deprecated this field is not used for anything in libavcodec 1241 */ 1242 attribute_deprecated 1243 char codec_name[32]; 1244 #endif 1245 enum AVCodecID codec_id; /* see AV_CODEC_ID_xxx */ 1246 1247 /** 1248 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A'). 1249 * This is used to work around some encoder bugs. 1250 * A demuxer should set this to what is stored in the field used to identify the codec. 1251 * If there are multiple such fields in a container then the demuxer should choose the one 1252 * which maximizes the information about the used codec. 1253 * If the codec tag field in a container is larger than 32 bits then the demuxer should 1254 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new 1255 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated 1256 * first. 1257 * - encoding: Set by user, if not then the default based on codec_id will be used. 1258 * - decoding: Set by user, will be converted to uppercase by libavcodec during init. 1259 */ 1260 unsigned int codec_tag; 1261 1262 /** 1263 * fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A'). 1264 * This is used to work around some encoder bugs. 1265 * - encoding: unused 1266 * - decoding: Set by user, will be converted to uppercase by libavcodec during init. 1267 */ 1268 unsigned int stream_codec_tag; 1269 1270 void *priv_data; 1271 1272 /** 1273 * Private context used for internal data. 1274 * 1275 * Unlike priv_data, this is not codec-specific. It is used in general 1276 * libavcodec functions. 1277 */ 1278 // struct AVCodecInternal *internal; 1279 1280 /** 1281 * Private data of the user, can be used to carry app specific stuff. 1282 * - encoding: Set by user. 1283 * - decoding: Set by user. 1284 */ 1285 void *opaque; 1286 1287 /** 1288 * the average bitrate 1289 * - encoding: Set by user; unused for constant quantizer encoding. 1290 * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream. 1291 */ 1292 int bit_rate; 1293 1294 /** 1295 * number of bits the bitstream is allowed to diverge from the reference. 1296 * the reference can be CBR (for CBR pass1) or VBR (for pass2) 1297 * - encoding: Set by user; unused for constant quantizer encoding. 1298 * - decoding: unused 1299 */ 1300 int bit_rate_tolerance; 1301 1302 /** 1303 * Global quality for codecs which cannot change it per frame. 1304 * This should be proportional to MPEG-1/2/4 qscale. 1305 * - encoding: Set by user. 1306 * - decoding: unused 1307 */ 1308 int global_quality; 1309 1310 /** 1311 * - encoding: Set by user. 1312 * - decoding: unused 1313 */ 1314 int compression_level; 1315 #define FF_COMPRESSION_DEFAULT -1 1316 1317 /** 1318 * CODEC_FLAG_*. 1319 * - encoding: Set by user. 1320 * - decoding: Set by user. 1321 */ 1322 int flags; 1323 1324 /** 1325 * CODEC_FLAG2_* 1326 * - encoding: Set by user. 1327 * - decoding: Set by user. 1328 */ 1329 int flags2; 1330 1331 /** 1332 * some codecs need / can use extradata like Huffman tables. 1333 * mjpeg: Huffman tables 1334 * rv10: additional flags 1335 * mpeg4: global headers (they can be in the bitstream or here) 1336 * The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger 1337 * than extradata_size to avoid problems if it is read with the bitstream reader. 1338 * The bytewise contents of extradata must not depend on the architecture or CPU endianness. 1339 * - encoding: Set/allocated/freed by libavcodec. 1340 * - decoding: Set/allocated/freed by user. 1341 */ 1342 uint8_t *extradata; 1343 int extradata_size; 1344 1345 /** 1346 * This is the fundamental unit of time (in seconds) in terms 1347 * of which frame timestamps are represented. For fixed-fps content, 1348 * timebase should be 1/framerate and timestamp increments should be 1349 * identically 1. 1350 * This often, but not always is the inverse of the frame rate or field rate 1351 * for video. 1352 * - encoding: MUST be set by user. 1353 * - decoding: the use of this field for decoding is deprecated. 1354 * Use framerate instead. 1355 */ 1356 AVRational time_base; 1357 1358 /** 1359 * For some codecs, the time base is closer to the field rate than the frame rate. 1360 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration 1361 * if no telecine is used ... 1362 * 1363 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2. 1364 */ 1365 int ticks_per_frame; 1366 1367 /** 1368 * Codec delay. 1369 * 1370 * Encoding: Number of frames delay there will be from the encoder input to 1371 * the decoder output. (we assume the decoder matches the spec) 1372 * Decoding: Number of frames delay in addition to what a standard decoder 1373 * as specified in the spec would produce. 1374 * 1375 * Video: 1376 * Number of frames the decoded output will be delayed relative to the 1377 * encoded input. 1378 * 1379 * Audio: 1380 * For encoding, this field is unused (see initial_padding). 1381 * 1382 * For decoding, this is the number of samples the decoder needs to 1383 * output before the decoder's output is valid. When seeking, you should 1384 * start decoding this many samples prior to your desired seek point. 1385 * 1386 * - encoding: Set by libavcodec. 1387 * - decoding: Set by libavcodec. 1388 */ 1389 int delay; 1390 1391 1392 /* video only */ 1393 /** 1394 * picture width / height. 1395 * - encoding: MUST be set by user. 1396 * - decoding: May be set by the user before opening the decoder if known e.g. 1397 * from the container. Some decoders will require the dimensions 1398 * to be set by the caller. During decoding, the decoder may 1399 * overwrite those values as required. 1400 */ 1401 int width, height; 1402 1403 /** 1404 * Bitstream width / height, may be different from width/height e.g. when 1405 * the decoded frame is cropped before being output or lowres is enabled. 1406 * - encoding: unused 1407 * - decoding: May be set by the user before opening the decoder if known 1408 * e.g. from the container. During decoding, the decoder may 1409 * overwrite those values as required. 1410 */ 1411 int coded_width, coded_height; 1412 1413 #if FF_API_ASPECT_EXTENDED 1414 #define FF_ASPECT_EXTENDED 15 1415 #endif 1416 1417 /** 1418 * the number of pictures in a group of pictures, or 0 for intra_only 1419 * - encoding: Set by user. 1420 * - decoding: unused 1421 */ 1422 int gop_size; 1423 1424 /** 1425 * Pixel format, see AV_PIX_FMT_xxx. 1426 * May be set by the demuxer if known from headers. 1427 * May be overridden by the decoder if it knows better. 1428 * - encoding: Set by user. 1429 * - decoding: Set by user if known, overridden by libavcodec if known 1430 */ 1431 enum AVPixelFormat pix_fmt; 1432 1433 /** 1434 * Motion estimation algorithm used for video coding. 1435 * 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex), 1436 * 8 (umh), 9 (iter), 10 (tesa) [7, 8, 10 are x264 specific, 9 is snow specific] 1437 * - encoding: MUST be set by user. 1438 * - decoding: unused 1439 */ 1440 int me_method; 1441 1442 /** 1443 * If non NULL, 'draw_horiz_band' is called by the libavcodec 1444 * decoder to draw a horizontal band. It improves cache usage. Not 1445 * all codecs can do that. You must check the codec capabilities 1446 * beforehand. 1447 * When multithreading is used, it may be called from multiple threads 1448 * at the same time; threads might draw different parts of the same AVFrame, 1449 * or multiple AVFrames, and there is no guarantee that slices will be drawn 1450 * in order. 1451 * The function is also used by hardware acceleration APIs. 1452 * It is called at least once during frame decoding to pass 1453 * the data needed for hardware render. 1454 * In that mode instead of pixel data, AVFrame points to 1455 * a structure specific to the acceleration API. The application 1456 * reads the structure and can change some fields to indicate progress 1457 * or mark state. 1458 * - encoding: unused 1459 * - decoding: Set by user. 1460 * @param height the height of the slice 1461 * @param y the y position of the slice 1462 * @param type 1->top field, 2->bottom field, 3->frame 1463 * @param offset offset into the AVFrame.data from which the slice should be read 1464 */ 1465 void (*draw_horiz_band)(struct AVCodecContext *s, 1466 const AVFrame *src, int offset[AV_NUM_DATA_POINTERS], 1467 int y, int type, int height); 1468 1469 /** 1470 * callback to negotiate the pixelFormat 1471 * @param fmt is the list of formats which are supported by the codec, 1472 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality. 1473 * The first is always the native one. 1474 * @note The callback may be called again immediately if initialization for 1475 * the selected (hardware-accelerated) pixel format failed. 1476 * @warning Behavior is undefined if the callback returns a value not 1477 * in the fmt list of formats. 1478 * @return the chosen format 1479 * - encoding: unused 1480 * - decoding: Set by user, if not set the native format will be chosen. 1481 */ 1482 enum AVPixelFormat (*get_format)(struct AVCodecContext *s, const enum AVPixelFormat * fmt); 1483 1484 /** 1485 * maximum number of B-frames between non-B-frames 1486 * Note: The output will be delayed by max_b_frames+1 relative to the input. 1487 * - encoding: Set by user. 1488 * - decoding: unused 1489 */ 1490 int max_b_frames; 1491 1492 /** 1493 * qscale factor between IP and B-frames 1494 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset). 1495 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset). 1496 * - encoding: Set by user. 1497 * - decoding: unused 1498 */ 1499 float b_quant_factor; 1500 1501 /** obsolete FIXME remove */ 1502 int rc_strategy; 1503 #define FF_RC_STRATEGY_XVID 1 1504 1505 int b_frame_strategy; 1506 1507 /** 1508 * qscale offset between IP and B-frames 1509 * - encoding: Set by user. 1510 * - decoding: unused 1511 */ 1512 float b_quant_offset; 1513 1514 /** 1515 * Size of the frame reordering buffer in the decoder. 1516 * For MPEG-2 it is 1 IPB or 0 low delay IP. 1517 * - encoding: Set by libavcodec. 1518 * - decoding: Set by libavcodec. 1519 */ 1520 int has_b_frames; 1521 1522 /** 1523 * 0-> h263 quant 1-> mpeg quant 1524 * - encoding: Set by user. 1525 * - decoding: unused 1526 */ 1527 int mpeg_quant; 1528 1529 /** 1530 * qscale factor between P and I-frames 1531 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset). 1532 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset). 1533 * - encoding: Set by user. 1534 * - decoding: unused 1535 */ 1536 float i_quant_factor; 1537 1538 /** 1539 * qscale offset between P and I-frames 1540 * - encoding: Set by user. 1541 * - decoding: unused 1542 */ 1543 float i_quant_offset; 1544 1545 /** 1546 * luminance masking (0-> disabled) 1547 * - encoding: Set by user. 1548 * - decoding: unused 1549 */ 1550 float lumi_masking; 1551 1552 /** 1553 * temporary complexity masking (0-> disabled) 1554 * - encoding: Set by user. 1555 * - decoding: unused 1556 */ 1557 float temporal_cplx_masking; 1558 1559 /** 1560 * spatial complexity masking (0-> disabled) 1561 * - encoding: Set by user. 1562 * - decoding: unused 1563 */ 1564 float spatial_cplx_masking; 1565 1566 /** 1567 * p block masking (0-> disabled) 1568 * - encoding: Set by user. 1569 * - decoding: unused 1570 */ 1571 float p_masking; 1572 1573 /** 1574 * darkness masking (0-> disabled) 1575 * - encoding: Set by user. 1576 * - decoding: unused 1577 */ 1578 float dark_masking; 1579 1580 /** 1581 * slice count 1582 * - encoding: Set by libavcodec. 1583 * - decoding: Set by user (or 0). 1584 */ 1585 int slice_count; 1586 /** 1587 * prediction method (needed for huffyuv) 1588 * - encoding: Set by user. 1589 * - decoding: unused 1590 */ 1591 int prediction_method; 1592 #define FF_PRED_LEFT 0 1593 #define FF_PRED_PLANE 1 1594 #define FF_PRED_MEDIAN 2 1595 1596 /** 1597 * slice offsets in the frame in bytes 1598 * - encoding: Set/allocated by libavcodec. 1599 * - decoding: Set/allocated by user (or NULL). 1600 */ 1601 int *slice_offset; 1602 1603 /** 1604 * sample aspect ratio (0 if unknown) 1605 * That is the width of a pixel divided by the height of the pixel. 1606 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards. 1607 * - encoding: Set by user. 1608 * - decoding: Set by libavcodec. 1609 */ 1610 AVRational sample_aspect_ratio; 1611 1612 /** 1613 * motion estimation comparison function 1614 * - encoding: Set by user. 1615 * - decoding: unused 1616 */ 1617 int me_cmp; 1618 /** 1619 * subpixel motion estimation comparison function 1620 * - encoding: Set by user. 1621 * - decoding: unused 1622 */ 1623 int me_sub_cmp; 1624 /** 1625 * macroblock comparison function (not supported yet) 1626 * - encoding: Set by user. 1627 * - decoding: unused 1628 */ 1629 int mb_cmp; 1630 /** 1631 * interlaced DCT comparison function 1632 * - encoding: Set by user. 1633 * - decoding: unused 1634 */ 1635 int ildct_cmp; 1636 #define FF_CMP_SAD 0 1637 #define FF_CMP_SSE 1 1638 #define FF_CMP_SATD 2 1639 #define FF_CMP_DCT 3 1640 #define FF_CMP_PSNR 4 1641 #define FF_CMP_BIT 5 1642 #define FF_CMP_RD 6 1643 #define FF_CMP_ZERO 7 1644 #define FF_CMP_VSAD 8 1645 #define FF_CMP_VSSE 9 1646 #define FF_CMP_NSSE 10 1647 #define FF_CMP_W53 11 1648 #define FF_CMP_W97 12 1649 #define FF_CMP_DCTMAX 13 1650 #define FF_CMP_DCT264 14 1651 #define FF_CMP_CHROMA 256 1652 1653 /** 1654 * ME diamond size & shape 1655 * - encoding: Set by user. 1656 * - decoding: unused 1657 */ 1658 int dia_size; 1659 1660 /** 1661 * amount of previous MV predictors (2a+1 x 2a+1 square) 1662 * - encoding: Set by user. 1663 * - decoding: unused 1664 */ 1665 int last_predictor_count; 1666 1667 /** 1668 * prepass for motion estimation 1669 * - encoding: Set by user. 1670 * - decoding: unused 1671 */ 1672 int pre_me; 1673 1674 /** 1675 * motion estimation prepass comparison function 1676 * - encoding: Set by user. 1677 * - decoding: unused 1678 */ 1679 int me_pre_cmp; 1680 1681 /** 1682 * ME prepass diamond size & shape 1683 * - encoding: Set by user. 1684 * - decoding: unused 1685 */ 1686 int pre_dia_size; 1687 1688 /** 1689 * subpel ME quality 1690 * - encoding: Set by user. 1691 * - decoding: unused 1692 */ 1693 int me_subpel_quality; 1694 1695 #if FF_API_AFD 1696 /** 1697 * DTG active format information (additional aspect ratio 1698 * information only used in DVB MPEG-2 transport streams) 1699 * 0 if not set. 1700 * 1701 * - encoding: unused 1702 * - decoding: Set by decoder. 1703 * @deprecated Deprecated in favor of AVSideData 1704 */ 1705 attribute_deprecated int dtg_active_format; 1706 #define FF_DTG_AFD_SAME 8 1707 #define FF_DTG_AFD_4_3 9 1708 #define FF_DTG_AFD_16_9 10 1709 #define FF_DTG_AFD_14_9 11 1710 #define FF_DTG_AFD_4_3_SP_14_9 13 1711 #define FF_DTG_AFD_16_9_SP_14_9 14 1712 #define FF_DTG_AFD_SP_4_3 15 1713 #endif /* FF_API_AFD */ 1714 1715 /** 1716 * maximum motion estimation search range in subpel units 1717 * If 0 then no limit. 1718 * 1719 * - encoding: Set by user. 1720 * - decoding: unused 1721 */ 1722 int me_range; 1723 1724 /** 1725 * intra quantizer bias 1726 * - encoding: Set by user. 1727 * - decoding: unused 1728 */ 1729 int intra_quant_bias; 1730 #define FF_DEFAULT_QUANT_BIAS 999999 1731 1732 /** 1733 * inter quantizer bias 1734 * - encoding: Set by user. 1735 * - decoding: unused 1736 */ 1737 int inter_quant_bias; 1738 1739 /** 1740 * slice flags 1741 * - encoding: unused 1742 * - decoding: Set by user. 1743 */ 1744 int slice_flags; 1745 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display 1746 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics) 1747 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1) 1748 1749 #if FF_API_XVMC 1750 /** 1751 * XVideo Motion Acceleration 1752 * - encoding: forbidden 1753 * - decoding: set by decoder 1754 * @deprecated XvMC doesn't need it anymore. 1755 */ 1756 attribute_deprecated int xvmc_acceleration; 1757 #endif /* FF_API_XVMC */ 1758 1759 /** 1760 * macroblock decision mode 1761 * - encoding: Set by user. 1762 * - decoding: unused 1763 */ 1764 int mb_decision; 1765 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp 1766 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits 1767 #define FF_MB_DECISION_RD 2 ///< rate distortion 1768 1769 /** 1770 * custom intra quantization matrix 1771 * - encoding: Set by user, can be NULL. 1772 * - decoding: Set by libavcodec. 1773 */ 1774 uint16_t *intra_matrix; 1775 1776 /** 1777 * custom inter quantization matrix 1778 * - encoding: Set by user, can be NULL. 1779 * - decoding: Set by libavcodec. 1780 */ 1781 uint16_t *inter_matrix; 1782 1783 /** 1784 * scene change detection threshold 1785 * 0 is default, larger means fewer detected scene changes. 1786 * - encoding: Set by user. 1787 * - decoding: unused 1788 */ 1789 int scenechange_threshold; 1790 1791 /** 1792 * noise reduction strength 1793 * - encoding: Set by user. 1794 * - decoding: unused 1795 */ 1796 int noise_reduction; 1797 1798 #if FF_API_MPV_OPT 1799 /** 1800 * @deprecated this field is unused 1801 */ 1802 attribute_deprecated 1803 int me_threshold; 1804 1805 /** 1806 * @deprecated this field is unused 1807 */ 1808 attribute_deprecated 1809 int mb_threshold; 1810 #endif 1811 1812 /** 1813 * precision of the intra DC coefficient - 8 1814 * - encoding: Set by user. 1815 * - decoding: unused 1816 */ 1817 int intra_dc_precision; 1818 1819 /** 1820 * Number of macroblock rows at the top which are skipped. 1821 * - encoding: unused 1822 * - decoding: Set by user. 1823 */ 1824 int skip_top; 1825 1826 /** 1827 * Number of macroblock rows at the bottom which are skipped. 1828 * - encoding: unused 1829 * - decoding: Set by user. 1830 */ 1831 int skip_bottom; 1832 1833 #if FF_API_MPV_OPT 1834 /** 1835 * @deprecated use encoder private options instead 1836 */ 1837 attribute_deprecated 1838 float border_masking; 1839 #endif 1840 1841 /** 1842 * minimum MB lagrange multipler 1843 * - encoding: Set by user. 1844 * - decoding: unused 1845 */ 1846 int mb_lmin; 1847 1848 /** 1849 * maximum MB lagrange multipler 1850 * - encoding: Set by user. 1851 * - decoding: unused 1852 */ 1853 int mb_lmax; 1854 1855 /** 1856 * 1857 * - encoding: Set by user. 1858 * - decoding: unused 1859 */ 1860 int me_penalty_compensation; 1861 1862 /** 1863 * 1864 * - encoding: Set by user. 1865 * - decoding: unused 1866 */ 1867 int bidir_refine; 1868 1869 /** 1870 * 1871 * - encoding: Set by user. 1872 * - decoding: unused 1873 */ 1874 int brd_scale; 1875 1876 /** 1877 * minimum GOP size 1878 * - encoding: Set by user. 1879 * - decoding: unused 1880 */ 1881 int keyint_min; 1882 1883 /** 1884 * number of reference frames 1885 * - encoding: Set by user. 1886 * - decoding: Set by lavc. 1887 */ 1888 int refs; 1889 1890 /** 1891 * chroma qp offset from luma 1892 * - encoding: Set by user. 1893 * - decoding: unused 1894 */ 1895 int chromaoffset; 1896 1897 #if FF_API_UNUSED_MEMBERS 1898 /** 1899 * Multiplied by qscale for each frame and added to scene_change_score. 1900 * - encoding: Set by user. 1901 * - decoding: unused 1902 */ 1903 attribute_deprecated int scenechange_factor; 1904 #endif 1905 1906 /** 1907 * 1908 * Note: Value depends upon the compare function used for fullpel ME. 1909 * - encoding: Set by user. 1910 * - decoding: unused 1911 */ 1912 int mv0_threshold; 1913 1914 /** 1915 * Adjust sensitivity of b_frame_strategy 1. 1916 * - encoding: Set by user. 1917 * - decoding: unused 1918 */ 1919 int b_sensitivity; 1920 1921 /** 1922 * Chromaticity coordinates of the source primaries. 1923 * - encoding: Set by user 1924 * - decoding: Set by libavcodec 1925 */ 1926 enum AVColorPrimaries color_primaries; 1927 1928 /** 1929 * Color Transfer Characteristic. 1930 * - encoding: Set by user 1931 * - decoding: Set by libavcodec 1932 */ 1933 enum AVColorTransferCharacteristic color_trc; 1934 1935 /** 1936 * YUV colorspace type. 1937 * - encoding: Set by user 1938 * - decoding: Set by libavcodec 1939 */ 1940 enum AVColorSpace colorspace; 1941 1942 /** 1943 * MPEG vs JPEG YUV range. 1944 * - encoding: Set by user 1945 * - decoding: Set by libavcodec 1946 */ 1947 enum AVColorRange color_range; 1948 1949 /** 1950 * This defines the location of chroma samples. 1951 * - encoding: Set by user 1952 * - decoding: Set by libavcodec 1953 */ 1954 enum AVChromaLocation chroma_sample_location; 1955 1956 /** 1957 * Number of slices. 1958 * Indicates number of picture subdivisions. Used for parallelized 1959 * decoding. 1960 * - encoding: Set by user 1961 * - decoding: unused 1962 */ 1963 int slices; 1964 1965 /** Field order 1966 * - encoding: set by libavcodec 1967 * - decoding: Set by user. 1968 */ 1969 enum AVFieldOrder field_order; 1970 1971 /* audio only */ 1972 int sample_rate; ///< samples per second 1973 int channels; ///< number of audio channels 1974 1975 /** 1976 * audio sample format 1977 * - encoding: Set by user. 1978 * - decoding: Set by libavcodec. 1979 */ 1980 enum AVSampleFormat sample_fmt; ///< sample format 1981 1982 /* The following data should not be initialized. */ 1983 /** 1984 * Number of samples per channel in an audio frame. 1985 * 1986 * - encoding: set by libavcodec in avcodec_open2(). Each submitted frame 1987 * except the last must contain exactly frame_size samples per channel. 1988 * May be 0 when the codec has CODEC_CAP_VARIABLE_FRAME_SIZE set, then the 1989 * frame size is not restricted. 1990 * - decoding: may be set by some decoders to indicate constant frame size 1991 */ 1992 int frame_size; 1993 1994 /** 1995 * Frame counter, set by libavcodec. 1996 * 1997 * - decoding: total number of frames returned from the decoder so far. 1998 * - encoding: total number of frames passed to the encoder so far. 1999 * 2000 * @note the counter is not incremented if encoding/decoding resulted in 2001 * an error. 2002 */ 2003 int frame_number; 2004 2005 /** 2006 * number of bytes per packet if constant and known or 0 2007 * Used by some WAV based audio codecs. 2008 */ 2009 int block_align; 2010 2011 /** 2012 * Audio cutoff bandwidth (0 means "automatic") 2013 * - encoding: Set by user. 2014 * - decoding: unused 2015 */ 2016 int cutoff; 2017 2018 #if FF_API_REQUEST_CHANNELS 2019 /** 2020 * Decoder should decode to this many channels if it can (0 for default) 2021 * - encoding: unused 2022 * - decoding: Set by user. 2023 * @deprecated Deprecated in favor of request_channel_layout. 2024 */ 2025 attribute_deprecated int request_channels; 2026 #endif 2027 2028 /** 2029 * Audio channel layout. 2030 * - encoding: set by user. 2031 * - decoding: set by user, may be overwritten by libavcodec. 2032 */ 2033 uint64_t channel_layout; 2034 2035 /** 2036 * Request decoder to use this channel layout if it can (0 for default) 2037 * - encoding: unused 2038 * - decoding: Set by user. 2039 */ 2040 uint64_t request_channel_layout; 2041 2042 /** 2043 * Type of service that the audio stream conveys. 2044 * - encoding: Set by user. 2045 * - decoding: Set by libavcodec. 2046 */ 2047 enum AVAudioServiceType audio_service_type; 2048 2049 /** 2050 * desired sample format 2051 * - encoding: Not used. 2052 * - decoding: Set by user. 2053 * Decoder will decode to this format if it can. 2054 */ 2055 enum AVSampleFormat request_sample_fmt; 2056 2057 #if FF_API_GET_BUFFER 2058 /** 2059 * Called at the beginning of each frame to get a buffer for it. 2060 * 2061 * The function will set AVFrame.data[], AVFrame.linesize[]. 2062 * AVFrame.extended_data[] must also be set, but it should be the same as 2063 * AVFrame.data[] except for planar audio with more channels than can fit 2064 * in AVFrame.data[]. In that case, AVFrame.data[] shall still contain as 2065 * many data pointers as it can hold. 2066 * 2067 * if CODEC_CAP_DR1 is not set then get_buffer() must call 2068 * avcodec_default_get_buffer() instead of providing buffers allocated by 2069 * some other means. 2070 * 2071 * AVFrame.data[] should be 32- or 16-byte-aligned unless the CPU doesn't 2072 * need it. avcodec_default_get_buffer() aligns the output buffer properly, 2073 * but if get_buffer() is overridden then alignment considerations should 2074 * be taken into account. 2075 * 2076 * @see avcodec_default_get_buffer() 2077 * 2078 * Video: 2079 * 2080 * If pic.reference is set then the frame will be read later by libavcodec. 2081 * avcodec_align_dimensions2() should be used to find the required width and 2082 * height, as they normally need to be rounded up to the next multiple of 16. 2083 * 2084 * If frame multithreading is used and thread_safe_callbacks is set, 2085 * it may be called from a different thread, but not from more than one at 2086 * once. Does not need to be reentrant. 2087 * 2088 * @see release_buffer(), reget_buffer() 2089 * @see avcodec_align_dimensions2() 2090 * 2091 * Audio: 2092 * 2093 * Decoders request a buffer of a particular size by setting 2094 * AVFrame.nb_samples prior to calling get_buffer(). The decoder may, 2095 * however, utilize only part of the buffer by setting AVFrame.nb_samples 2096 * to a smaller value in the output frame. 2097 * 2098 * Decoders cannot use the buffer after returning from 2099 * avcodec_decode_audio4(), so they will not call release_buffer(), as it 2100 * is assumed to be released immediately upon return. In some rare cases, 2101 * a decoder may need to call get_buffer() more than once in a single 2102 * call to avcodec_decode_audio4(). In that case, when get_buffer() is 2103 * called again after it has already been called once, the previously 2104 * acquired buffer is assumed to be released at that time and may not be 2105 * reused by the decoder. 2106 * 2107 * As a convenience, av_samples_get_buffer_size() and 2108 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer() 2109 * functions to find the required data size and to fill data pointers and 2110 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio 2111 * since all planes must be the same size. 2112 * 2113 * @see av_samples_get_buffer_size(), av_samples_fill_arrays() 2114 * 2115 * - encoding: unused 2116 * - decoding: Set by libavcodec, user can override. 2117 * 2118 * @deprecated use get_buffer2() 2119 */ 2120 attribute_deprecated 2121 int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic); 2122 2123 /** 2124 * Called to release buffers which were allocated with get_buffer. 2125 * A released buffer can be reused in get_buffer(). 2126 * pic.data[*] must be set to NULL. 2127 * May be called from a different thread if frame multithreading is used, 2128 * but not by more than one thread at once, so does not need to be reentrant. 2129 * - encoding: unused 2130 * - decoding: Set by libavcodec, user can override. 2131 * 2132 * @deprecated custom freeing callbacks should be set from get_buffer2() 2133 */ 2134 attribute_deprecated 2135 void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic); 2136 2137 /** 2138 * Called at the beginning of a frame to get cr buffer for it. 2139 * Buffer type (size, hints) must be the same. libavcodec won't check it. 2140 * libavcodec will pass previous buffer in pic, function should return 2141 * same buffer or new buffer with old frame "painted" into it. 2142 * If pic.data[0] == NULL must behave like get_buffer(). 2143 * if CODEC_CAP_DR1 is not set then reget_buffer() must call 2144 * avcodec_default_reget_buffer() instead of providing buffers allocated by 2145 * some other means. 2146 * - encoding: unused 2147 * - decoding: Set by libavcodec, user can override. 2148 */ 2149 attribute_deprecated 2150 int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic); 2151 #endif 2152 2153 /** 2154 * This callback is called at the beginning of each frame to get data 2155 * buffer(s) for it. There may be one contiguous buffer for all the data or 2156 * there may be a buffer per each data plane or anything in between. What 2157 * this means is, you may set however many entries in buf[] you feel necessary. 2158 * Each buffer must be reference-counted using the AVBuffer API (see description 2159 * of buf[] below). 2160 * 2161 * The following fields will be set in the frame before this callback is 2162 * called: 2163 * - format 2164 * - width, height (video only) 2165 * - sample_rate, channel_layout, nb_samples (audio only) 2166 * Their values may differ from the corresponding values in 2167 * AVCodecContext. This callback must use the frame values, not the codec 2168 * context values, to calculate the required buffer size. 2169 * 2170 * This callback must fill the following fields in the frame: 2171 * - data[] 2172 * - linesize[] 2173 * - extended_data: 2174 * * if the data is planar audio with more than 8 channels, then this 2175 * callback must allocate and fill extended_data to contain all pointers 2176 * to all data planes. data[] must hold as many pointers as it can. 2177 * extended_data must be allocated with av_malloc() and will be freed in 2178 * av_frame_unref(). 2179 * * otherwise exended_data must point to data 2180 * - buf[] must contain one or more pointers to AVBufferRef structures. Each of 2181 * the frame's data and extended_data pointers must be contained in these. That 2182 * is, one AVBufferRef for each allocated chunk of memory, not necessarily one 2183 * AVBufferRef per data[] entry. See: av_buffer_create(), av_buffer_alloc(), 2184 * and av_buffer_ref(). 2185 * - extended_buf and nb_extended_buf must be allocated with av_malloc() by 2186 * this callback and filled with the extra buffers if there are more 2187 * buffers than buf[] can hold. extended_buf will be freed in 2188 * av_frame_unref(). 2189 * 2190 * If CODEC_CAP_DR1 is not set then get_buffer2() must call 2191 * avcodec_default_get_buffer2() instead of providing buffers allocated by 2192 * some other means. 2193 * 2194 * Each data plane must be aligned to the maximum required by the target 2195 * CPU. 2196 * 2197 * @see avcodec_default_get_buffer2() 2198 * 2199 * Video: 2200 * 2201 * If AV_GET_BUFFER_FLAG_REF is set in flags then the frame may be reused 2202 * (read and/or written to if it is writable) later by libavcodec. 2203 * 2204 * avcodec_align_dimensions2() should be used to find the required width and 2205 * height, as they normally need to be rounded up to the next multiple of 16. 2206 * 2207 * Some decoders do not support linesizes changing between frames. 2208 * 2209 * If frame multithreading is used and thread_safe_callbacks is set, 2210 * this callback may be called from a different thread, but not from more 2211 * than one at once. Does not need to be reentrant. 2212 * 2213 * @see avcodec_align_dimensions2() 2214 * 2215 * Audio: 2216 * 2217 * Decoders request a buffer of a particular size by setting 2218 * AVFrame.nb_samples prior to calling get_buffer2(). The decoder may, 2219 * however, utilize only part of the buffer by setting AVFrame.nb_samples 2220 * to a smaller value in the output frame. 2221 * 2222 * As a convenience, av_samples_get_buffer_size() and 2223 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer2() 2224 * functions to find the required data size and to fill data pointers and 2225 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio 2226 * since all planes must be the same size. 2227 * 2228 * @see av_samples_get_buffer_size(), av_samples_fill_arrays() 2229 * 2230 * - encoding: unused 2231 * - decoding: Set by libavcodec, user can override. 2232 */ 2233 int (*get_buffer2)(struct AVCodecContext *s, AVFrame *frame, int flags); 2234 2235 /** 2236 * If non-zero, the decoded audio and video frames returned from 2237 * avcodec_decode_video2() and avcodec_decode_audio4() are reference-counted 2238 * and are valid indefinitely. The caller must free them with 2239 * av_frame_unref() when they are not needed anymore. 2240 * Otherwise, the decoded frames must not be freed by the caller and are 2241 * only valid until the next decode call. 2242 * 2243 * - encoding: unused 2244 * - decoding: set by the caller before avcodec_open2(). 2245 */ 2246 int refcounted_frames; 2247 2248 /* - encoding parameters */ 2249 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0) 2250 float qblur; ///< amount of qscale smoothing over time (0.0-1.0) 2251 2252 /** 2253 * minimum quantizer 2254 * - encoding: Set by user. 2255 * - decoding: unused 2256 */ 2257 int qmin; 2258 2259 /** 2260 * maximum quantizer 2261 * - encoding: Set by user. 2262 * - decoding: unused 2263 */ 2264 int qmax; 2265 2266 /** 2267 * maximum quantizer difference between frames 2268 * - encoding: Set by user. 2269 * - decoding: unused 2270 */ 2271 int max_qdiff; 2272 2273 #if FF_API_MPV_OPT 2274 /** 2275 * @deprecated use encoder private options instead 2276 */ 2277 attribute_deprecated 2278 float rc_qsquish; 2279 2280 attribute_deprecated 2281 float rc_qmod_amp; 2282 attribute_deprecated 2283 int rc_qmod_freq; 2284 #endif 2285 2286 /** 2287 * decoder bitstream buffer size 2288 * - encoding: Set by user. 2289 * - decoding: unused 2290 */ 2291 int rc_buffer_size; 2292 2293 /** 2294 * ratecontrol override, see RcOverride 2295 * - encoding: Allocated/set/freed by user. 2296 * - decoding: unused 2297 */ 2298 int rc_override_count; 2299 RcOverride *rc_override; 2300 2301 #if FF_API_MPV_OPT 2302 /** 2303 * @deprecated use encoder private options instead 2304 */ 2305 attribute_deprecated 2306 const char *rc_eq; 2307 #endif 2308 2309 /** 2310 * maximum bitrate 2311 * - encoding: Set by user. 2312 * - decoding: Set by libavcodec. 2313 */ 2314 int rc_max_rate; 2315 2316 /** 2317 * minimum bitrate 2318 * - encoding: Set by user. 2319 * - decoding: unused 2320 */ 2321 int rc_min_rate; 2322 2323 #if FF_API_MPV_OPT 2324 /** 2325 * @deprecated use encoder private options instead 2326 */ 2327 attribute_deprecated 2328 float rc_buffer_aggressivity; 2329 2330 attribute_deprecated 2331 float rc_initial_cplx; 2332 #endif 2333 2334 /** 2335 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow. 2336 * - encoding: Set by user. 2337 * - decoding: unused. 2338 */ 2339 float rc_max_available_vbv_use; 2340 2341 /** 2342 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow. 2343 * - encoding: Set by user. 2344 * - decoding: unused. 2345 */ 2346 float rc_min_vbv_overflow_use; 2347 2348 /** 2349 * Number of bits which should be loaded into the rc buffer before decoding starts. 2350 * - encoding: Set by user. 2351 * - decoding: unused 2352 */ 2353 int rc_initial_buffer_occupancy; 2354 2355 #define FF_CODER_TYPE_VLC 0 2356 #define FF_CODER_TYPE_AC 1 2357 #define FF_CODER_TYPE_RAW 2 2358 #define FF_CODER_TYPE_RLE 3 2359 #if FF_API_UNUSED_MEMBERS 2360 #define FF_CODER_TYPE_DEFLATE 4 2361 #endif /* FF_API_UNUSED_MEMBERS */ 2362 /** 2363 * coder type 2364 * - encoding: Set by user. 2365 * - decoding: unused 2366 */ 2367 int coder_type; 2368 2369 /** 2370 * context model 2371 * - encoding: Set by user. 2372 * - decoding: unused 2373 */ 2374 int context_model; 2375 2376 #if FF_API_MPV_OPT 2377 /** 2378 * @deprecated use encoder private options instead 2379 */ 2380 attribute_deprecated 2381 int lmin; 2382 2383 /** 2384 * @deprecated use encoder private options instead 2385 */ 2386 attribute_deprecated 2387 int lmax; 2388 #endif 2389 2390 /** 2391 * frame skip threshold 2392 * - encoding: Set by user. 2393 * - decoding: unused 2394 */ 2395 int frame_skip_threshold; 2396 2397 /** 2398 * frame skip factor 2399 * - encoding: Set by user. 2400 * - decoding: unused 2401 */ 2402 int frame_skip_factor; 2403 2404 /** 2405 * frame skip exponent 2406 * - encoding: Set by user. 2407 * - decoding: unused 2408 */ 2409 int frame_skip_exp; 2410 2411 /** 2412 * frame skip comparison function 2413 * - encoding: Set by user. 2414 * - decoding: unused 2415 */ 2416 int frame_skip_cmp; 2417 2418 /** 2419 * trellis RD quantization 2420 * - encoding: Set by user. 2421 * - decoding: unused 2422 */ 2423 int trellis; 2424 2425 /** 2426 * - encoding: Set by user. 2427 * - decoding: unused 2428 */ 2429 int min_prediction_order; 2430 2431 /** 2432 * - encoding: Set by user. 2433 * - decoding: unused 2434 */ 2435 int max_prediction_order; 2436 2437 /** 2438 * GOP timecode frame start number 2439 * - encoding: Set by user, in non drop frame format 2440 * - decoding: Set by libavcodec (timecode in the 25 bits format, -1 if unset) 2441 */ 2442 int64_t timecode_frame_start; 2443 2444 /* The RTP callback: This function is called */ 2445 /* every time the encoder has a packet to send. */ 2446 /* It depends on the encoder if the data starts */ 2447 /* with a Start Code (it should). H.263 does. */ 2448 /* mb_nb contains the number of macroblocks */ 2449 /* encoded in the RTP payload. */ 2450 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb); 2451 2452 int rtp_payload_size; /* The size of the RTP payload: the coder will */ 2453 /* do its best to deliver a chunk with size */ 2454 /* below rtp_payload_size, the chunk will start */ 2455 /* with a start code on some codecs like H.263. */ 2456 /* This doesn't take account of any particular */ 2457 /* headers inside the transmitted RTP payload. */ 2458 2459 /* statistics, used for 2-pass encoding */ 2460 int mv_bits; 2461 int header_bits; 2462 int i_tex_bits; 2463 int p_tex_bits; 2464 int i_count; 2465 int p_count; 2466 int skip_count; 2467 int misc_bits; 2468 2469 /** 2470 * number of bits used for the previously encoded frame 2471 * - encoding: Set by libavcodec. 2472 * - decoding: unused 2473 */ 2474 int frame_bits; 2475 2476 /** 2477 * pass1 encoding statistics output buffer 2478 * - encoding: Set by libavcodec. 2479 * - decoding: unused 2480 */ 2481 char *stats_out; 2482 2483 /** 2484 * pass2 encoding statistics input buffer 2485 * Concatenated stuff from stats_out of pass1 should be placed here. 2486 * - encoding: Allocated/set/freed by user. 2487 * - decoding: unused 2488 */ 2489 char *stats_in; 2490 2491 /** 2492 * Work around bugs in encoders which sometimes cannot be detected automatically. 2493 * - encoding: Set by user 2494 * - decoding: Set by user 2495 */ 2496 int workaround_bugs; 2497 #define FF_BUG_AUTODETECT 1 ///< autodetection 2498 #if FF_API_OLD_MSMPEG4 2499 #define FF_BUG_OLD_MSMPEG4 2 2500 #endif 2501 #define FF_BUG_XVID_ILACE 4 2502 #define FF_BUG_UMP4 8 2503 #define FF_BUG_NO_PADDING 16 2504 #define FF_BUG_AMV 32 2505 #if FF_API_AC_VLC 2506 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default. 2507 #endif 2508 #define FF_BUG_QPEL_CHROMA 64 2509 #define FF_BUG_STD_QPEL 128 2510 #define FF_BUG_QPEL_CHROMA2 256 2511 #define FF_BUG_DIRECT_BLOCKSIZE 512 2512 #define FF_BUG_EDGE 1024 2513 #define FF_BUG_HPEL_CHROMA 2048 2514 #define FF_BUG_DC_CLIP 4096 2515 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders. 2516 #define FF_BUG_TRUNCATED 16384 2517 2518 /** 2519 * strictly follow the standard (MPEG4, ...). 2520 * - encoding: Set by user. 2521 * - decoding: Set by user. 2522 * Setting this to STRICT or higher means the encoder and decoder will 2523 * generally do stupid things, whereas setting it to unofficial or lower 2524 * will mean the encoder might produce output that is not supported by all 2525 * spec-compliant decoders. Decoders don't differentiate between normal, 2526 * unofficial and experimental (that is, they always try to decode things 2527 * when they can) unless they are explicitly asked to behave stupidly 2528 * (=strictly conform to the specs) 2529 */ 2530 int strict_std_compliance; 2531 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software. 2532 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences. 2533 #define FF_COMPLIANCE_NORMAL 0 2534 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions 2535 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things. 2536 2537 /** 2538 * error concealment flags 2539 * - encoding: unused 2540 * - decoding: Set by user. 2541 */ 2542 int error_concealment; 2543 #define FF_EC_GUESS_MVS 1 2544 #define FF_EC_DEBLOCK 2 2545 #define FF_EC_FAVOR_INTER 256 2546 2547 /** 2548 * debug 2549 * - encoding: Set by user. 2550 * - decoding: Set by user. 2551 */ 2552 int debug; 2553 #define FF_DEBUG_PICT_INFO 1 2554 #define FF_DEBUG_RC 2 2555 #define FF_DEBUG_BITSTREAM 4 2556 #define FF_DEBUG_MB_TYPE 8 2557 #define FF_DEBUG_QP 16 2558 #if FF_API_DEBUG_MV 2559 /** 2560 * @deprecated this option does nothing 2561 */ 2562 #define FF_DEBUG_MV 32 2563 #endif 2564 #define FF_DEBUG_DCT_COEFF 0x00000040 2565 #define FF_DEBUG_SKIP 0x00000080 2566 #define FF_DEBUG_STARTCODE 0x00000100 2567 #if FF_API_UNUSED_MEMBERS 2568 #define FF_DEBUG_PTS 0x00000200 2569 #endif /* FF_API_UNUSED_MEMBERS */ 2570 #define FF_DEBUG_ER 0x00000400 2571 #define FF_DEBUG_MMCO 0x00000800 2572 #define FF_DEBUG_BUGS 0x00001000 2573 #if FF_API_DEBUG_MV 2574 #define FF_DEBUG_VIS_QP 0x00002000 ///< only access through AVOptions from outside libavcodec 2575 #define FF_DEBUG_VIS_MB_TYPE 0x00004000 ///< only access through AVOptions from outside libavcodec 2576 #endif 2577 #define FF_DEBUG_BUFFERS 0x00008000 2578 #define FF_DEBUG_THREADS 0x00010000 2579 #define FF_DEBUG_NOMC 0x01000000 2580 2581 #if FF_API_DEBUG_MV 2582 /** 2583 * debug 2584 * Code outside libavcodec should access this field using AVOptions 2585 * - encoding: Set by user. 2586 * - decoding: Set by user. 2587 */ 2588 int debug_mv; 2589 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames 2590 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames 2591 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames 2592 #endif 2593 2594 /** 2595 * Error recognition; may misdetect some more or less valid parts as errors. 2596 * - encoding: unused 2597 * - decoding: Set by user. 2598 */ 2599 int err_recognition; 2600 2601 /** 2602 * Verify checksums embedded in the bitstream (could be of either encoded or 2603 * decoded data, depending on the codec) and print an error message on mismatch. 2604 * If AV_EF_EXPLODE is also set, a mismatching checksum will result in the 2605 * decoder returning an error. 2606 */ 2607 #define AV_EF_CRCCHECK (1<<0) 2608 #define AV_EF_BITSTREAM (1<<1) ///< detect bitstream specification deviations 2609 #define AV_EF_BUFFER (1<<2) ///< detect improper bitstream length 2610 #define AV_EF_EXPLODE (1<<3) ///< abort decoding on minor error detection 2611 2612 #define AV_EF_IGNORE_ERR (1<<15) ///< ignore errors and continue 2613 #define AV_EF_CAREFUL (1<<16) ///< consider things that violate the spec, are fast to calculate and have not been seen in the wild as errors 2614 #define AV_EF_COMPLIANT (1<<17) ///< consider all spec non compliances as errors 2615 #define AV_EF_AGGRESSIVE (1<<18) ///< consider things that a sane encoder should not do as an error 2616 2617 2618 /** 2619 * opaque 64bit number (generally a PTS) that will be reordered and 2620 * output in AVFrame.reordered_opaque 2621 * - encoding: unused 2622 * - decoding: Set by user. 2623 */ 2624 int64_t reordered_opaque; 2625 2626 /** 2627 * Hardware accelerator in use 2628 * - encoding: unused. 2629 * - decoding: Set by libavcodec 2630 */ 2631 struct AVHWAccel *hwaccel; 2632 2633 /** 2634 * Hardware accelerator context. 2635 * For some hardware accelerators, a global context needs to be 2636 * provided by the user. In that case, this holds display-dependent 2637 * data FFmpeg cannot instantiate itself. Please refer to the 2638 * FFmpeg HW accelerator documentation to know how to fill this 2639 * is. e.g. for VA API, this is a struct vaapi_context. 2640 * - encoding: unused 2641 * - decoding: Set by user 2642 */ 2643 void *hwaccel_context; 2644 2645 /** 2646 * error 2647 * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR. 2648 * - decoding: unused 2649 */ 2650 uint64_t error[AV_NUM_DATA_POINTERS]; 2651 2652 /** 2653 * DCT algorithm, see FF_DCT_* below 2654 * - encoding: Set by user. 2655 * - decoding: unused 2656 */ 2657 int dct_algo; 2658 #define FF_DCT_AUTO 0 2659 #define FF_DCT_FASTINT 1 2660 #if FF_API_UNUSED_MEMBERS 2661 #define FF_DCT_INT 2 2662 #endif /* FF_API_UNUSED_MEMBERS */ 2663 #define FF_DCT_MMX 3 2664 #define FF_DCT_ALTIVEC 5 2665 #define FF_DCT_FAAN 6 2666 2667 /** 2668 * IDCT algorithm, see FF_IDCT_* below. 2669 * - encoding: Set by user. 2670 * - decoding: Set by user. 2671 */ 2672 int idct_algo; 2673 #define FF_IDCT_AUTO 0 2674 #define FF_IDCT_INT 1 2675 #define FF_IDCT_SIMPLE 2 2676 #define FF_IDCT_SIMPLEMMX 3 2677 #define FF_IDCT_ARM 7 2678 #define FF_IDCT_ALTIVEC 8 2679 #if FF_API_ARCH_SH4 2680 #define FF_IDCT_SH4 9 2681 #endif 2682 #define FF_IDCT_SIMPLEARM 10 2683 #if FF_API_UNUSED_MEMBERS 2684 #define FF_IDCT_IPP 13 2685 #endif /* FF_API_UNUSED_MEMBERS */ 2686 #define FF_IDCT_XVID 14 2687 #if FF_API_IDCT_XVIDMMX 2688 #define FF_IDCT_XVIDMMX 14 2689 #endif /* FF_API_IDCT_XVIDMMX */ 2690 #define FF_IDCT_SIMPLEARMV5TE 16 2691 #define FF_IDCT_SIMPLEARMV6 17 2692 #if FF_API_ARCH_SPARC 2693 #define FF_IDCT_SIMPLEVIS 18 2694 #endif 2695 #define FF_IDCT_FAAN 20 2696 #define FF_IDCT_SIMPLENEON 22 2697 #if FF_API_ARCH_ALPHA 2698 #define FF_IDCT_SIMPLEALPHA 23 2699 #endif 2700 #define FF_IDCT_SIMPLEAUTO 128 2701 2702 /** 2703 * bits per sample/pixel from the demuxer (needed for huffyuv). 2704 * - encoding: Set by libavcodec. 2705 * - decoding: Set by user. 2706 */ 2707 int bits_per_coded_sample; 2708 2709 /** 2710 * Bits per sample/pixel of internal libavcodec pixel/sample format. 2711 * - encoding: set by user. 2712 * - decoding: set by libavcodec. 2713 */ 2714 int bits_per_raw_sample; 2715 2716 #if FF_API_LOWRES 2717 /** 2718 * low resolution decoding, 1-> 1/2 size, 2->1/4 size 2719 * - encoding: unused 2720 * - decoding: Set by user. 2721 * Code outside libavcodec should access this field using: 2722 * av_codec_{get,set}_lowres(avctx) 2723 */ 2724 int lowres; 2725 #endif 2726 2727 /** 2728 * the picture in the bitstream 2729 * - encoding: Set by libavcodec. 2730 * - decoding: unused 2731 */ 2732 AVFrame *coded_frame; 2733 2734 /** 2735 * thread count 2736 * is used to decide how many independent tasks should be passed to execute() 2737 * - encoding: Set by user. 2738 * - decoding: Set by user. 2739 */ 2740 int thread_count; 2741 2742 /** 2743 * Which multithreading methods to use. 2744 * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread, 2745 * so clients which cannot provide future frames should not use it. 2746 * 2747 * - encoding: Set by user, otherwise the default is used. 2748 * - decoding: Set by user, otherwise the default is used. 2749 */ 2750 int thread_type; 2751 #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once 2752 #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once 2753 2754 /** 2755 * Which multithreading methods are in use by the codec. 2756 * - encoding: Set by libavcodec. 2757 * - decoding: Set by libavcodec. 2758 */ 2759 int active_thread_type; 2760 2761 /** 2762 * Set by the client if its custom get_buffer() callback can be called 2763 * synchronously from another thread, which allows faster multithreaded decoding. 2764 * draw_horiz_band() will be called from other threads regardless of this setting. 2765 * Ignored if the default get_buffer() is used. 2766 * - encoding: Set by user. 2767 * - decoding: Set by user. 2768 */ 2769 int thread_safe_callbacks; 2770 2771 /** 2772 * The codec may call this to execute several independent things. 2773 * It will return only after finishing all tasks. 2774 * The user may replace this with some multithreaded implementation, 2775 * the default implementation will execute the parts serially. 2776 * @param count the number of things to execute 2777 * - encoding: Set by libavcodec, user can override. 2778 * - decoding: Set by libavcodec, user can override. 2779 */ 2780 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size); 2781 2782 /** 2783 * The codec may call this to execute several independent things. 2784 * It will return only after finishing all tasks. 2785 * The user may replace this with some multithreaded implementation, 2786 * the default implementation will execute the parts serially. 2787 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option. 2788 * @param c context passed also to func 2789 * @param count the number of things to execute 2790 * @param arg2 argument passed unchanged to func 2791 * @param ret return values of executed functions, must have space for "count" values. May be NULL. 2792 * @param func function that will be called count times, with jobnr from 0 to count-1. 2793 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no 2794 * two instances of func executing at the same time will have the same threadnr. 2795 * @return always 0 currently, but code should handle a future improvement where when any call to func 2796 * returns < 0 no further calls to func may be done and < 0 is returned. 2797 * - encoding: Set by libavcodec, user can override. 2798 * - decoding: Set by libavcodec, user can override. 2799 */ 2800 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count); 2801 2802 #if FF_API_THREAD_OPAQUE 2803 /** 2804 * @deprecated this field should not be used from outside of lavc 2805 */ 2806 attribute_deprecated 2807 void *thread_opaque; 2808 #endif 2809 2810 /** 2811 * noise vs. sse weight for the nsse comparison function 2812 * - encoding: Set by user. 2813 * - decoding: unused 2814 */ 2815 int nsse_weight; 2816 2817 /** 2818 * profile 2819 * - encoding: Set by user. 2820 * - decoding: Set by libavcodec. 2821 */ 2822 int profile; 2823 #define FF_PROFILE_UNKNOWN -99 2824 #define FF_PROFILE_RESERVED -100 2825 2826 #define FF_PROFILE_AAC_MAIN 0 2827 #define FF_PROFILE_AAC_LOW 1 2828 #define FF_PROFILE_AAC_SSR 2 2829 #define FF_PROFILE_AAC_LTP 3 2830 #define FF_PROFILE_AAC_HE 4 2831 #define FF_PROFILE_AAC_HE_V2 28 2832 #define FF_PROFILE_AAC_LD 22 2833 #define FF_PROFILE_AAC_ELD 38 2834 #define FF_PROFILE_MPEG2_AAC_LOW 128 2835 #define FF_PROFILE_MPEG2_AAC_HE 131 2836 2837 #define FF_PROFILE_DTS 20 2838 #define FF_PROFILE_DTS_ES 30 2839 #define FF_PROFILE_DTS_96_24 40 2840 #define FF_PROFILE_DTS_HD_HRA 50 2841 #define FF_PROFILE_DTS_HD_MA 60 2842 2843 #define FF_PROFILE_MPEG2_422 0 2844 #define FF_PROFILE_MPEG2_HIGH 1 2845 #define FF_PROFILE_MPEG2_SS 2 2846 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3 2847 #define FF_PROFILE_MPEG2_MAIN 4 2848 #define FF_PROFILE_MPEG2_SIMPLE 5 2849 2850 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag 2851 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag 2852 2853 #define FF_PROFILE_H264_BASELINE 66 2854 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED) 2855 #define FF_PROFILE_H264_MAIN 77 2856 #define FF_PROFILE_H264_EXTENDED 88 2857 #define FF_PROFILE_H264_HIGH 100 2858 #define FF_PROFILE_H264_HIGH_10 110 2859 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA) 2860 #define FF_PROFILE_H264_HIGH_422 122 2861 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA) 2862 #define FF_PROFILE_H264_HIGH_444 144 2863 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244 2864 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA) 2865 #define FF_PROFILE_H264_CAVLC_444 44 2866 2867 #define FF_PROFILE_VC1_SIMPLE 0 2868 #define FF_PROFILE_VC1_MAIN 1 2869 #define FF_PROFILE_VC1_COMPLEX 2 2870 #define FF_PROFILE_VC1_ADVANCED 3 2871 2872 #define FF_PROFILE_MPEG4_SIMPLE 0 2873 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1 2874 #define FF_PROFILE_MPEG4_CORE 2 2875 #define FF_PROFILE_MPEG4_MAIN 3 2876 #define FF_PROFILE_MPEG4_N_BIT 4 2877 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5 2878 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6 2879 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7 2880 #define FF_PROFILE_MPEG4_HYBRID 8 2881 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9 2882 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10 2883 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11 2884 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12 2885 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13 2886 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14 2887 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15 2888 2889 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_0 0 2890 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_1 1 2891 #define FF_PROFILE_JPEG2000_CSTREAM_NO_RESTRICTION 2 2892 #define FF_PROFILE_JPEG2000_DCINEMA_2K 3 2893 #define FF_PROFILE_JPEG2000_DCINEMA_4K 4 2894 2895 2896 #define FF_PROFILE_HEVC_MAIN 1 2897 #define FF_PROFILE_HEVC_MAIN_10 2 2898 #define FF_PROFILE_HEVC_MAIN_STILL_PICTURE 3 2899 #define FF_PROFILE_HEVC_REXT 4 2900 2901 /** 2902 * level 2903 * - encoding: Set by user. 2904 * - decoding: Set by libavcodec. 2905 */ 2906 int level; 2907 #define FF_LEVEL_UNKNOWN -99 2908 2909 /** 2910 * Skip loop filtering for selected frames. 2911 * - encoding: unused 2912 * - decoding: Set by user. 2913 */ 2914 enum AVDiscard skip_loop_filter; 2915 2916 /** 2917 * Skip IDCT/dequantization for selected frames. 2918 * - encoding: unused 2919 * - decoding: Set by user. 2920 */ 2921 enum AVDiscard skip_idct; 2922 2923 /** 2924 * Skip decoding for selected frames. 2925 * - encoding: unused 2926 * - decoding: Set by user. 2927 */ 2928 enum AVDiscard skip_frame; 2929 2930 /** 2931 * Header containing style information for text subtitles. 2932 * For SUBTITLE_ASS subtitle type, it should contain the whole ASS 2933 * [Script Info] and [V4+ Styles] section, plus the [Events] line and 2934 * the Format line following. It shouldn't include any Dialogue line. 2935 * - encoding: Set/allocated/freed by user (before avcodec_open2()) 2936 * - decoding: Set/allocated/freed by libavcodec (by avcodec_open2()) 2937 */ 2938 uint8_t *subtitle_header; 2939 int subtitle_header_size; 2940 2941 #if FF_API_ERROR_RATE 2942 /** 2943 * @deprecated use the 'error_rate' private AVOption of the mpegvideo 2944 * encoders 2945 */ 2946 attribute_deprecated 2947 int error_rate; 2948 #endif 2949 2950 #if FF_API_CODEC_PKT 2951 /** 2952 * @deprecated this field is not supposed to be accessed from outside lavc 2953 */ 2954 attribute_deprecated 2955 AVPacket *pkt; 2956 #endif 2957 2958 /** 2959 * VBV delay coded in the last frame (in periods of a 27 MHz clock). 2960 * Used for compliant TS muxing. 2961 * - encoding: Set by libavcodec. 2962 * - decoding: unused. 2963 */ 2964 uint64_t vbv_delay; 2965 2966 /** 2967 * Encoding only. Allow encoders to output packets that do not contain any 2968 * encoded data, only side data. 2969 * 2970 * Some encoders need to output such packets, e.g. to update some stream 2971 * parameters at the end of encoding. 2972 * 2973 * All callers are strongly recommended to set this option to 1 and update 2974 * their code to deal with such packets, since this behaviour may become 2975 * always enabled in the future (then this option will be deprecated and 2976 * later removed). To avoid ABI issues when this happens, the callers should 2977 * use AVOptions to set this field. 2978 */ 2979 int side_data_only_packets; 2980 2981 /** 2982 * Audio only. The number of "priming" samples (padding) inserted by the 2983 * encoder at the beginning of the audio. I.e. this number of leading 2984 * decoded samples must be discarded by the caller to get the original audio 2985 * without leading padding. 2986 * 2987 * - decoding: unused 2988 * - encoding: Set by libavcodec. The timestamps on the output packets are 2989 * adjusted by the encoder so that they always refer to the 2990 * first sample of the data actually contained in the packet, 2991 * including any added padding. E.g. if the timebase is 2992 * 1/samplerate and the timestamp of the first input sample is 2993 * 0, the timestamp of the first output packet will be 2994 * -initial_padding. 2995 */ 2996 int initial_padding; 2997 2998 /** 2999 * - decoding: For codecs that store a framerate value in the compressed 3000 * bitstream, the decoder may export it here. { 0, 1} when 3001 * unknown. 3002 * - encoding: unused 3003 */ 3004 AVRational framerate; 3005 3006 /** 3007 * Timebase in which pkt_dts/pts and AVPacket.dts/pts are. 3008 * Code outside libavcodec should access this field using: 3009 * av_codec_{get,set}_pkt_timebase(avctx) 3010 * - encoding unused. 3011 * - decoding set by user. 3012 */ 3013 AVRational pkt_timebase; 3014 3015 /** 3016 * AVCodecDescriptor 3017 * Code outside libavcodec should access this field using: 3018 * av_codec_{get,set}_codec_descriptor(avctx) 3019 * - encoding: unused. 3020 * - decoding: set by libavcodec. 3021 */ 3022 const AVCodecDescriptor *codec_descriptor; 3023 3024 #if !FF_API_LOWRES 3025 /** 3026 * low resolution decoding, 1-> 1/2 size, 2->1/4 size 3027 * - encoding: unused 3028 * - decoding: Set by user. 3029 * Code outside libavcodec should access this field using: 3030 * av_codec_{get,set}_lowres(avctx) 3031 */ 3032 int lowres; 3033 #endif 3034 3035 /** 3036 * Current statistics for PTS correction. 3037 * - decoding: maintained and used by libavcodec, not intended to be used by user apps 3038 * - encoding: unused 3039 */ 3040 int64_t pts_correction_num_faulty_pts; /// Number of incorrect PTS values so far 3041 int64_t pts_correction_num_faulty_dts; /// Number of incorrect DTS values so far 3042 int64_t pts_correction_last_pts; /// PTS of the last frame 3043 int64_t pts_correction_last_dts; /// DTS of the last frame 3044 3045 /** 3046 * Character encoding of the input subtitles file. 3047 * - decoding: set by user 3048 * - encoding: unused 3049 */ 3050 char *sub_charenc; 3051 3052 /** 3053 * Subtitles character encoding mode. Formats or codecs might be adjusting 3054 * this setting (if they are doing the conversion themselves for instance). 3055 * - decoding: set by libavcodec 3056 * - encoding: unused 3057 */ 3058 int sub_charenc_mode; 3059 #define FF_SUB_CHARENC_MODE_DO_NOTHING -1 ///< do nothing (demuxer outputs a stream supposed to be already in UTF-8, or the codec is bitmap for instance) 3060 #define FF_SUB_CHARENC_MODE_AUTOMATIC 0 ///< libavcodec will select the mode itself 3061 #define FF_SUB_CHARENC_MODE_PRE_DECODER 1 ///< the AVPacket data needs to be recoded to UTF-8 before being fed to the decoder, requires iconv 3062 3063 /** 3064 * Skip processing alpha if supported by codec. 3065 * Note that if the format uses pre-multiplied alpha (common with VP6, 3066 * and recommended due to better video quality/compression) 3067 * the image will look as if alpha-blended onto a black background. 3068 * However for formats that do not use pre-multiplied alpha 3069 * there might be serious artefacts (though e.g. libswscale currently 3070 * assumes pre-multiplied alpha anyway). 3071 * Code outside libavcodec should access this field using AVOptions 3072 * 3073 * - decoding: set by user 3074 * - encoding: unused 3075 */ 3076 int skip_alpha; 3077 3078 /** 3079 * Number of samples to skip after a discontinuity 3080 * - decoding: unused 3081 * - encoding: set by libavcodec 3082 */ 3083 int seek_preroll; 3084 3085 #if !FF_API_DEBUG_MV 3086 /** 3087 * debug motion vectors 3088 * Code outside libavcodec should access this field using AVOptions 3089 * - encoding: Set by user. 3090 * - decoding: Set by user. 3091 */ 3092 int debug_mv; 3093 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames 3094 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames 3095 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames 3096 #endif 3097 3098 /** 3099 * custom intra quantization matrix 3100 * Code outside libavcodec should access this field using av_codec_g/set_chroma_intra_matrix() 3101 * - encoding: Set by user, can be NULL. 3102 * - decoding: unused. 3103 */ 3104 uint16_t *chroma_intra_matrix; 3105 3106 /** 3107 * dump format separator. 3108 * can be ", " or "\n " or anything else 3109 * Code outside libavcodec should access this field using AVOptions 3110 * (NO direct access). 3111 * - encoding: Set by user. 3112 * - decoding: Set by user. 3113 */ 3114 uint8_t *dump_separator; 3115 3116 /** 3117 * ',' seperated list of allowed decoders. 3118 * If NULL then all are allowed 3119 * - encoding: unused 3120 * - decoding: set by user through AVOPtions (NO direct access) 3121 */ 3122 char *codec_whitelist; 3123 } AVCodecContext; 3124 3125 AVRational av_codec_get_pkt_timebase (const AVCodecContext *avctx); 3126 void av_codec_set_pkt_timebase (AVCodecContext *avctx, AVRational val); 3127 3128 const AVCodecDescriptor *av_codec_get_codec_descriptor(const AVCodecContext *avctx); 3129 void av_codec_set_codec_descriptor(AVCodecContext *avctx, const AVCodecDescriptor *desc); 3130 3131 int av_codec_get_lowres(const AVCodecContext *avctx); 3132 void av_codec_set_lowres(AVCodecContext *avctx, int val); 3133 3134 int av_codec_get_seek_preroll(const AVCodecContext *avctx); 3135 void av_codec_set_seek_preroll(AVCodecContext *avctx, int val); 3136 3137 uint16_t *av_codec_get_chroma_intra_matrix(const AVCodecContext *avctx); 3138 void av_codec_set_chroma_intra_matrix(AVCodecContext *avctx, uint16_t *val); 3139 3140 /** 3141 * AVProfile. 3142 */ 3143 typedef struct AVProfile { 3144 int profile; 3145 const char *name; ///< short name for the profile 3146 } AVProfile; 3147 3148 typedef struct AVCodecDefault AVCodecDefault; 3149 3150 struct AVSubtitle; 3151 3152 /** 3153 * AVCodec. 3154 */ 3155 typedef struct AVCodec { 3156 /** 3157 * Name of the codec implementation. 3158 * The name is globally unique among encoders and among decoders (but an 3159 * encoder and a decoder can share the same name). 3160 * This is the primary way to find a codec from the user perspective. 3161 */ 3162 const char *name; 3163 /** 3164 * Descriptive name for the codec, meant to be more human readable than name. 3165 * You should use the NULL_IF_CONFIG_SMALL() macro to define it. 3166 */ 3167 const char *long_name; 3168 enum AVMediaType type; 3169 enum AVCodecID id; 3170 /** 3171 * Codec capabilities. 3172 * see CODEC_CAP_* 3173 */ 3174 int capabilities; 3175 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0} 3176 const enum AVPixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1 3177 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0 3178 const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1 3179 const uint64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0 3180 #if FF_API_LOWRES 3181 uint8_t max_lowres; ///< maximum value for lowres supported by the decoder, no direct access, use av_codec_get_max_lowres() 3182 #endif 3183 const AVClass *priv_class; ///< AVClass for the private context 3184 const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN} 3185 3186 /***************************************************************** 3187 * No fields below this line are part of the public API. They 3188 * may not be used outside of libavcodec and can be changed and 3189 * removed at will. 3190 * New public fields should be added right above. 3191 ***************************************************************** 3192 */ 3193 int priv_data_size; 3194 struct AVCodec *next; 3195 /** 3196 * @name Frame-level threading support functions 3197 * @{ 3198 */ 3199 /** 3200 * If defined, called on thread contexts when they are created. 3201 * If the codec allocates writable tables in init(), re-allocate them here. 3202 * priv_data will be set to a copy of the original. 3203 */ 3204 int (*init_thread_copy)(AVCodecContext *); 3205 /** 3206 * Copy necessary context variables from a previous thread context to the current one. 3207 * If not defined, the next thread will start automatically; otherwise, the codec 3208 * must call ff_thread_finish_setup(). 3209 * 3210 * dst and src will (rarely) point to the same context, in which case memcpy should be skipped. 3211 */ 3212 int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src); 3213 /** @} */ 3214 3215 /** 3216 * Private codec-specific defaults. 3217 */ 3218 const AVCodecDefault *defaults; 3219 3220 /** 3221 * Initialize codec static data, called from avcodec_register(). 3222 */ 3223 void (*init_static_data)(struct AVCodec *codec); 3224 3225 int (*init)(AVCodecContext *); 3226 int (*encode_sub)(AVCodecContext *, uint8_t *buf, int buf_size, 3227 const struct AVSubtitle *sub); 3228 /** 3229 * Encode data to an AVPacket. 3230 * 3231 * @param avctx codec context 3232 * @param avpkt output AVPacket (may contain a user-provided buffer) 3233 * @param[in] frame AVFrame containing the raw data to be encoded 3234 * @param[out] got_packet_ptr encoder sets to 0 or 1 to indicate that a 3235 * non-empty packet was returned in avpkt. 3236 * @return 0 on success, negative error code on failure 3237 */ 3238 int (*encode2)(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame, 3239 int *got_packet_ptr); 3240 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt); 3241 int (*close)(AVCodecContext *); 3242 /** 3243 * Flush buffers. 3244 * Will be called when seeking 3245 */ 3246 void (*flush)(AVCodecContext *); 3247 } AVCodec; 3248 3249 int av_codec_get_max_lowres(const AVCodec *codec); 3250 3251 struct MpegEncContext; 3252 3253 /** 3254 * @defgroup lavc_hwaccel AVHWAccel 3255 * @{ 3256 */ 3257 typedef struct AVHWAccel { 3258 /** 3259 * Name of the hardware accelerated codec. 3260 * The name is globally unique among encoders and among decoders (but an 3261 * encoder and a decoder can share the same name). 3262 */ 3263 const char *name; 3264 3265 /** 3266 * Type of codec implemented by the hardware accelerator. 3267 * 3268 * See AVMEDIA_TYPE_xxx 3269 */ 3270 enum AVMediaType type; 3271 3272 /** 3273 * Codec implemented by the hardware accelerator. 3274 * 3275 * See AV_CODEC_ID_xxx 3276 */ 3277 enum AVCodecID id; 3278 3279 /** 3280 * Supported pixel format. 3281 * 3282 * Only hardware accelerated formats are supported here. 3283 */ 3284 enum AVPixelFormat pix_fmt; 3285 3286 /** 3287 * Hardware accelerated codec capabilities. 3288 * see FF_HWACCEL_CODEC_CAP_* 3289 */ 3290 int capabilities; 3291 3292 /***************************************************************** 3293 * No fields below this line are part of the public API. They 3294 * may not be used outside of libavcodec and can be changed and 3295 * removed at will. 3296 * New public fields should be added right above. 3297 ***************************************************************** 3298 */ 3299 struct AVHWAccel *next; 3300 3301 /** 3302 * Allocate a custom buffer 3303 */ 3304 int (*alloc_frame)(AVCodecContext *avctx, AVFrame *frame); 3305 3306 /** 3307 * Called at the beginning of each frame or field picture. 3308 * 3309 * Meaningful frame information (codec specific) is guaranteed to 3310 * be parsed at this point. This function is mandatory. 3311 * 3312 * Note that buf can be NULL along with buf_size set to 0. 3313 * Otherwise, this means the whole frame is available at this point. 3314 * 3315 * @param avctx the codec context 3316 * @param buf the frame data buffer base 3317 * @param buf_size the size of the frame in bytes 3318 * @return zero if successful, a negative value otherwise 3319 */ 3320 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size); 3321 3322 /** 3323 * Callback for each slice. 3324 * 3325 * Meaningful slice information (codec specific) is guaranteed to 3326 * be parsed at this point. This function is mandatory. 3327 * The only exception is XvMC, that works on MB level. 3328 * 3329 * @param avctx the codec context 3330 * @param buf the slice data buffer base 3331 * @param buf_size the size of the slice in bytes 3332 * @return zero if successful, a negative value otherwise 3333 */ 3334 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size); 3335 3336 /** 3337 * Called at the end of each frame or field picture. 3338 * 3339 * The whole picture is parsed at this point and can now be sent 3340 * to the hardware accelerator. This function is mandatory. 3341 * 3342 * @param avctx the codec context 3343 * @return zero if successful, a negative value otherwise 3344 */ 3345 int (*end_frame)(AVCodecContext *avctx); 3346 3347 /** 3348 * Size of per-frame hardware accelerator private data. 3349 * 3350 * Private data is allocated with av_mallocz() before 3351 * AVCodecContext.get_buffer() and deallocated after 3352 * AVCodecContext.release_buffer(). 3353 */ 3354 int frame_priv_data_size; 3355 3356 /** 3357 * Called for every Macroblock in a slice. 3358 * 3359 * XvMC uses it to replace the ff_mpv_decode_mb(). 3360 * Instead of decoding to raw picture, MB parameters are 3361 * stored in an array provided by the video driver. 3362 * 3363 * @param s the mpeg context 3364 */ 3365 void (*decode_mb)(struct MpegEncContext *s); 3366 3367 /** 3368 * Initialize the hwaccel private data. 3369 * 3370 * This will be called from ff_get_format(), after hwaccel and 3371 * hwaccel_context are set and the hwaccel private data in AVCodecInternal 3372 * is allocated. 3373 */ 3374 int (*init)(AVCodecContext *avctx); 3375 3376 /** 3377 * Uninitialize the hwaccel private data. 3378 * 3379 * This will be called from get_format() or avcodec_close(), after hwaccel 3380 * and hwaccel_context are already uninitialized. 3381 */ 3382 int (*uninit)(AVCodecContext *avctx); 3383 3384 /** 3385 * Size of the private data to allocate in 3386 * AVCodecInternal.hwaccel_priv_data. 3387 */ 3388 int priv_data_size; 3389 } AVHWAccel; 3390 3391 /** 3392 * Hardware acceleration should be used for decoding even if the codec level 3393 * used is unknown or higher than the maximum supported level reported by the 3394 * hardware driver. 3395 */ 3396 #define AV_HWACCEL_FLAG_IGNORE_LEVEL (1 << 0) 3397 3398 /** 3399 * @} 3400 */ 3401 3402 /** 3403 * @defgroup lavc_picture AVPicture 3404 * 3405 * Functions for working with AVPicture 3406 * @{ 3407 */ 3408 3409 /** 3410 * Picture data structure. 3411 * 3412 * Up to four components can be stored into it, the last component is 3413 * alpha. 3414 */ 3415 typedef struct AVPicture { 3416 uint8_t *data[AV_NUM_DATA_POINTERS]; ///< pointers to the image data planes 3417 int linesize[AV_NUM_DATA_POINTERS]; ///< number of bytes per line 3418 } AVPicture; 3419 3420 /** 3421 * @} 3422 */ 3423 3424 enum AVSubtitleType { 3425 SUBTITLE_NONE, 3426 3427 SUBTITLE_BITMAP, ///< A bitmap, pict will be set 3428 3429 /** 3430 * Plain text, the text field must be set by the decoder and is 3431 * authoritative. ass and pict fields may contain approximations. 3432 */ 3433 SUBTITLE_TEXT, 3434 3435 /** 3436 * Formatted text, the ass field must be set by the decoder and is 3437 * authoritative. pict and text fields may contain approximations. 3438 */ 3439 SUBTITLE_ASS, 3440 }; 3441 3442 #define AV_SUBTITLE_FLAG_FORCED 0x00000001 3443 3444 typedef struct AVSubtitleRect { 3445 int x; ///< top left corner of pict, undefined when pict is not set 3446 int y; ///< top left corner of pict, undefined when pict is not set 3447 int w; ///< width of pict, undefined when pict is not set 3448 int h; ///< height of pict, undefined when pict is not set 3449 int nb_colors; ///< number of colors in pict, undefined when pict is not set 3450 3451 /** 3452 * data+linesize for the bitmap of this subtitle. 3453 * can be set for text/ass as well once they where rendered 3454 */ 3455 AVPicture pict; 3456 enum AVSubtitleType type; 3457 3458 char *text; ///< 0 terminated plain UTF-8 text 3459 3460 /** 3461 * 0 terminated ASS/SSA compatible event line. 3462 * The presentation of this is unaffected by the other values in this 3463 * struct. 3464 */ 3465 char *ass; 3466 3467 int flags; 3468 } AVSubtitleRect; 3469 3470 typedef struct AVSubtitle { 3471 uint16_t format; /* 0 = graphics */ 3472 uint32_t start_display_time; /* relative to packet pts, in ms */ 3473 uint32_t end_display_time; /* relative to packet pts, in ms */ 3474 unsigned num_rects; 3475 AVSubtitleRect **rects; 3476 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE 3477 } AVSubtitle; 3478 3479 /** 3480 * If c is NULL, returns the first registered codec, 3481 * if c is non-NULL, returns the next registered codec after c, 3482 * or NULL if c is the last one. 3483 */ 3484 AVCodec *av_codec_next(const AVCodec *c); 3485 3486 /** 3487 * Return the LIBAVCODEC_VERSION_INT constant. 3488 */ 3489 unsigned avcodec_version(void); 3490 3491 /** 3492 * Return the libavcodec build-time configuration. 3493 */ 3494 const char *avcodec_configuration(void); 3495 3496 /** 3497 * Return the libavcodec license. 3498 */ 3499 const char *avcodec_license(void); 3500 3501 /** 3502 * Register the codec codec and initialize libavcodec. 3503 * 3504 * @warning either this function or avcodec_register_all() must be called 3505 * before any other libavcodec functions. 3506 * 3507 * @see avcodec_register_all() 3508 */ 3509 void avcodec_register(AVCodec *codec); 3510 3511 /** 3512 * Register all the codecs, parsers and bitstream filters which were enabled at 3513 * configuration time. If you do not call this function you can select exactly 3514 * which formats you want to support, by using the individual registration 3515 * functions. 3516 * 3517 * @see avcodec_register 3518 * @see av_register_codec_parser 3519 * @see av_register_bitstream_filter 3520 */ 3521 void avcodec_register_all(void); 3522 3523 /** 3524 * Allocate an AVCodecContext and set its fields to default values. The 3525 * resulting struct should be freed with avcodec_free_context(). 3526 * 3527 * @param codec if non-NULL, allocate private data and initialize defaults 3528 * for the given codec. It is illegal to then call avcodec_open2() 3529 * with a different codec. 3530 * If NULL, then the codec-specific defaults won't be initialized, 3531 * which may result in suboptimal default settings (this is 3532 * important mainly for encoders, e.g. libx264). 3533 * 3534 * @return An AVCodecContext filled with default values or NULL on failure. 3535 * @see avcodec_get_context_defaults 3536 */ 3537 AVCodecContext *avcodec_alloc_context3(const AVCodec *codec); 3538 3539 /** 3540 * Free the codec context and everything associated with it and write NULL to 3541 * the provided pointer. 3542 */ 3543 void avcodec_free_context(AVCodecContext **avctx); 3544 3545 /** 3546 * Set the fields of the given AVCodecContext to default values corresponding 3547 * to the given codec (defaults may be codec-dependent). 3548 * 3549 * Do not call this function if a non-NULL codec has been passed 3550 * to avcodec_alloc_context3() that allocated this AVCodecContext. 3551 * If codec is non-NULL, it is illegal to call avcodec_open2() with a 3552 * different codec on this AVCodecContext. 3553 */ 3554 int avcodec_get_context_defaults3(AVCodecContext *s, const AVCodec *codec); 3555 3556 /** 3557 * Get the AVClass for AVCodecContext. It can be used in combination with 3558 * AV_OPT_SEARCH_FAKE_OBJ for examining options. 3559 * 3560 * @see av_opt_find(). 3561 */ 3562 const AVClass *avcodec_get_class(void); 3563 3564 /** 3565 * Get the AVClass for AVFrame. It can be used in combination with 3566 * AV_OPT_SEARCH_FAKE_OBJ for examining options. 3567 * 3568 * @see av_opt_find(). 3569 */ 3570 const AVClass *avcodec_get_frame_class(void); 3571 3572 /** 3573 * Get the AVClass for AVSubtitleRect. It can be used in combination with 3574 * AV_OPT_SEARCH_FAKE_OBJ for examining options. 3575 * 3576 * @see av_opt_find(). 3577 */ 3578 const AVClass *avcodec_get_subtitle_rect_class(void); 3579 3580 /** 3581 * Copy the settings of the source AVCodecContext into the destination 3582 * AVCodecContext. The resulting destination codec context will be 3583 * unopened, i.e. you are required to call avcodec_open2() before you 3584 * can use this AVCodecContext to decode/encode video/audio data. 3585 * 3586 * @param dest target codec context, should be initialized with 3587 * avcodec_alloc_context3(NULL), but otherwise uninitialized 3588 * @param src source codec context 3589 * @return AVERROR() on error (e.g. memory allocation error), 0 on success 3590 */ 3591 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src); 3592 3593 #if FF_API_AVFRAME_LAVC 3594 /** 3595 * @deprecated use av_frame_alloc() 3596 */ 3597 attribute_deprecated 3598 AVFrame *avcodec_alloc_frame(void); 3599 3600 /** 3601 * Set the fields of the given AVFrame to default values. 3602 * 3603 * @param frame The AVFrame of which the fields should be set to default values. 3604 * 3605 * @deprecated use av_frame_unref() 3606 */ 3607 attribute_deprecated 3608 void avcodec_get_frame_defaults(AVFrame *frame); 3609 3610 /** 3611 * Free the frame and any dynamically allocated objects in it, 3612 * e.g. extended_data. 3613 * 3614 * @param frame frame to be freed. The pointer will be set to NULL. 3615 * 3616 * @warning this function does NOT free the data buffers themselves 3617 * (it does not know how, since they might have been allocated with 3618 * a custom get_buffer()). 3619 * 3620 * @deprecated use av_frame_free() 3621 */ 3622 attribute_deprecated 3623 void avcodec_free_frame(AVFrame **frame); 3624 #endif 3625 3626 /** 3627 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this 3628 * function the context has to be allocated with avcodec_alloc_context3(). 3629 * 3630 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(), 3631 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for 3632 * retrieving a codec. 3633 * 3634 * @warning This function is not thread safe! 3635 * 3636 * @code 3637 * avcodec_register_all(); 3638 * av_dict_set(&opts, "b", "2.5M", 0); 3639 * codec = avcodec_find_decoder(AV_CODEC_ID_H264); 3640 * if (!codec) 3641 * exit(1); 3642 * 3643 * context = avcodec_alloc_context3(codec); 3644 * 3645 * if (avcodec_open2(context, codec, opts) < 0) 3646 * exit(1); 3647 * @endcode 3648 * 3649 * @param avctx The context to initialize. 3650 * @param codec The codec to open this context for. If a non-NULL codec has been 3651 * previously passed to avcodec_alloc_context3() or 3652 * avcodec_get_context_defaults3() for this context, then this 3653 * parameter MUST be either NULL or equal to the previously passed 3654 * codec. 3655 * @param options A dictionary filled with AVCodecContext and codec-private options. 3656 * On return this object will be filled with options that were not found. 3657 * 3658 * @return zero on success, a negative value on error 3659 * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(), 3660 * av_dict_set(), av_opt_find(). 3661 */ 3662 int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options); 3663 3664 /** 3665 * Close a given AVCodecContext and free all the data associated with it 3666 * (but not the AVCodecContext itself). 3667 * 3668 * Calling this function on an AVCodecContext that hasn't been opened will free 3669 * the codec-specific data allocated in avcodec_alloc_context3() / 3670 * avcodec_get_context_defaults3() with a non-NULL codec. Subsequent calls will 3671 * do nothing. 3672 */ 3673 int avcodec_close(AVCodecContext *avctx); 3674 3675 /** 3676 * Free all allocated data in the given subtitle struct. 3677 * 3678 * @param sub AVSubtitle to free. 3679 */ 3680 void avsubtitle_free(AVSubtitle *sub); 3681 3682 /** 3683 * @} 3684 */ 3685 3686 /** 3687 * @addtogroup lavc_packet 3688 * @{ 3689 */ 3690 3691 #if FF_API_DESTRUCT_PACKET 3692 /** 3693 * Default packet destructor. 3694 * @deprecated use the AVBuffer API instead 3695 */ 3696 attribute_deprecated 3697 void av_destruct_packet(AVPacket *pkt); 3698 #endif 3699 3700 /** 3701 * Initialize optional fields of a packet with default values. 3702 * 3703 * Note, this does not touch the data and size members, which have to be 3704 * initialized separately. 3705 * 3706 * @param pkt packet 3707 */ 3708 void av_init_packet(AVPacket *pkt); 3709 3710 /** 3711 * Allocate the payload of a packet and initialize its fields with 3712 * default values. 3713 * 3714 * @param pkt packet 3715 * @param size wanted payload size 3716 * @return 0 if OK, AVERROR_xxx otherwise 3717 */ 3718 int av_new_packet(AVPacket *pkt, int size); 3719 3720 /** 3721 * Reduce packet size, correctly zeroing padding 3722 * 3723 * @param pkt packet 3724 * @param size new size 3725 */ 3726 void av_shrink_packet(AVPacket *pkt, int size); 3727 3728 /** 3729 * Increase packet size, correctly zeroing padding 3730 * 3731 * @param pkt packet 3732 * @param grow_by number of bytes by which to increase the size of the packet 3733 */ 3734 int av_grow_packet(AVPacket *pkt, int grow_by); 3735 3736 /** 3737 * Initialize a reference-counted packet from av_malloc()ed data. 3738 * 3739 * @param pkt packet to be initialized. This function will set the data, size, 3740 * buf and destruct fields, all others are left untouched. 3741 * @param data Data allocated by av_malloc() to be used as packet data. If this 3742 * function returns successfully, the data is owned by the underlying AVBuffer. 3743 * The caller may not access the data through other means. 3744 * @param size size of data in bytes, without the padding. I.e. the full buffer 3745 * size is assumed to be size + FF_INPUT_BUFFER_PADDING_SIZE. 3746 * 3747 * @return 0 on success, a negative AVERROR on error 3748 */ 3749 int av_packet_from_data(AVPacket *pkt, uint8_t *data, int size); 3750 3751 /** 3752 * @warning This is a hack - the packet memory allocation stuff is broken. The 3753 * packet is allocated if it was not really allocated. 3754 */ 3755 int av_dup_packet(AVPacket *pkt); 3756 3757 /** 3758 * Copy packet, including contents 3759 * 3760 * @return 0 on success, negative AVERROR on fail 3761 */ 3762 int av_copy_packet(AVPacket *dst, const AVPacket *src); 3763 3764 /** 3765 * Copy packet side data 3766 * 3767 * @return 0 on success, negative AVERROR on fail 3768 */ 3769 int av_copy_packet_side_data(AVPacket *dst, const AVPacket *src); 3770 3771 /** 3772 * Free a packet. 3773 * 3774 * @param pkt packet to free 3775 */ 3776 void av_free_packet(AVPacket *pkt); 3777 3778 /** 3779 * Allocate new information of a packet. 3780 * 3781 * @param pkt packet 3782 * @param type side information type 3783 * @param size side information size 3784 * @return pointer to fresh allocated data or NULL otherwise 3785 */ 3786 uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type, 3787 int size); 3788 3789 /** 3790 * Shrink the already allocated side data buffer 3791 * 3792 * @param pkt packet 3793 * @param type side information type 3794 * @param size new side information size 3795 * @return 0 on success, < 0 on failure 3796 */ 3797 int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type, 3798 int size); 3799 3800 /** 3801 * Get side information from packet. 3802 * 3803 * @param pkt packet 3804 * @param type desired side information type 3805 * @param size pointer for side information size to store (optional) 3806 * @return pointer to data if present or NULL otherwise 3807 */ 3808 uint8_t* av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type, 3809 int *size); 3810 3811 int av_packet_merge_side_data(AVPacket *pkt); 3812 3813 int av_packet_split_side_data(AVPacket *pkt); 3814 3815 /** 3816 * Pack a dictionary for use in side_data. 3817 * 3818 * @param dict The dictionary to pack. 3819 * @param size pointer to store the size of the returned data 3820 * @return pointer to data if successful, NULL otherwise 3821 */ 3822 uint8_t *av_packet_pack_dictionary(AVDictionary *dict, int *size); 3823 /** 3824 * Unpack a dictionary from side_data. 3825 * 3826 * @param data data from side_data 3827 * @param size size of the data 3828 * @param dict the metadata storage dictionary 3829 * @return 0 on success, < 0 on failure 3830 */ 3831 int av_packet_unpack_dictionary(const uint8_t *data, int size, AVDictionary **dict); 3832 3833 3834 /** 3835 * Convenience function to free all the side data stored. 3836 * All the other fields stay untouched. 3837 * 3838 * @param pkt packet 3839 */ 3840 void av_packet_free_side_data(AVPacket *pkt); 3841 3842 /** 3843 * Setup a new reference to the data described by a given packet 3844 * 3845 * If src is reference-counted, setup dst as a new reference to the 3846 * buffer in src. Otherwise allocate a new buffer in dst and copy the 3847 * data from src into it. 3848 * 3849 * All the other fields are copied from src. 3850 * 3851 * @see av_packet_unref 3852 * 3853 * @param dst Destination packet 3854 * @param src Source packet 3855 * 3856 * @return 0 on success, a negative AVERROR on error. 3857 */ 3858 int av_packet_ref(AVPacket *dst, const AVPacket *src); 3859 3860 /** 3861 * Wipe the packet. 3862 * 3863 * Unreference the buffer referenced by the packet and reset the 3864 * remaining packet fields to their default values. 3865 * 3866 * @param pkt The packet to be unreferenced. 3867 */ 3868 void av_packet_unref(AVPacket *pkt); 3869 3870 /** 3871 * Move every field in src to dst and reset src. 3872 * 3873 * @see av_packet_unref 3874 * 3875 * @param src Source packet, will be reset 3876 * @param dst Destination packet 3877 */ 3878 void av_packet_move_ref(AVPacket *dst, AVPacket *src); 3879 3880 /** 3881 * Copy only "properties" fields from src to dst. 3882 * 3883 * Properties for the purpose of this function are all the fields 3884 * beside those related to the packet data (buf, data, size) 3885 * 3886 * @param dst Destination packet 3887 * @param src Source packet 3888 * 3889 * @return 0 on success AVERROR on failure. 3890 * 3891 */ 3892 int av_packet_copy_props(AVPacket *dst, const AVPacket *src); 3893 3894 /** 3895 * Convert valid timing fields (timestamps / durations) in a packet from one 3896 * timebase to another. Timestamps with unknown values (AV_NOPTS_VALUE) will be 3897 * ignored. 3898 * 3899 * @param pkt packet on which the conversion will be performed 3900 * @param tb_src source timebase, in which the timing fields in pkt are 3901 * expressed 3902 * @param tb_dst destination timebase, to which the timing fields will be 3903 * converted 3904 */ 3905 void av_packet_rescale_ts(AVPacket *pkt, AVRational tb_src, AVRational tb_dst); 3906 3907 /** 3908 * @} 3909 */ 3910 3911 /** 3912 * @addtogroup lavc_decoding 3913 * @{ 3914 */ 3915 3916 /** 3917 * Find a registered decoder with a matching codec ID. 3918 * 3919 * @param id AVCodecID of the requested decoder 3920 * @return A decoder if one was found, NULL otherwise. 3921 */ 3922 AVCodec *avcodec_find_decoder(enum AVCodecID id); 3923 3924 /** 3925 * Find a registered decoder with the specified name. 3926 * 3927 * @param name name of the requested decoder 3928 * @return A decoder if one was found, NULL otherwise. 3929 */ 3930 AVCodec *avcodec_find_decoder_by_name(const char *name); 3931 3932 #if FF_API_GET_BUFFER 3933 attribute_deprecated int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic); 3934 attribute_deprecated void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic); 3935 attribute_deprecated int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic); 3936 #endif 3937 3938 /** 3939 * The default callback for AVCodecContext.get_buffer2(). It is made public so 3940 * it can be called by custom get_buffer2() implementations for decoders without 3941 * CODEC_CAP_DR1 set. 3942 */ 3943 int avcodec_default_get_buffer2(AVCodecContext *s, AVFrame *frame, int flags); 3944 3945 #if FF_API_EMU_EDGE 3946 /** 3947 * Return the amount of padding in pixels which the get_buffer callback must 3948 * provide around the edge of the image for codecs which do not have the 3949 * CODEC_FLAG_EMU_EDGE flag. 3950 * 3951 * @return Required padding in pixels. 3952 * 3953 * @deprecated CODEC_FLAG_EMU_EDGE is deprecated, so this function is no longer 3954 * needed 3955 */ 3956 attribute_deprecated 3957 unsigned avcodec_get_edge_width(void); 3958 #endif 3959 3960 /** 3961 * Modify width and height values so that they will result in a memory 3962 * buffer that is acceptable for the codec if you do not use any horizontal 3963 * padding. 3964 * 3965 * May only be used if a codec with CODEC_CAP_DR1 has been opened. 3966 */ 3967 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height); 3968 3969 /** 3970 * Modify width and height values so that they will result in a memory 3971 * buffer that is acceptable for the codec if you also ensure that all 3972 * line sizes are a multiple of the respective linesize_align[i]. 3973 * 3974 * May only be used if a codec with CODEC_CAP_DR1 has been opened. 3975 */ 3976 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height, 3977 int linesize_align[AV_NUM_DATA_POINTERS]); 3978 3979 /** 3980 * Converts AVChromaLocation to swscale x/y chroma position. 3981 * 3982 * The positions represent the chroma (0,0) position in a coordinates system 3983 * with luma (0,0) representing the origin and luma(1,1) representing 256,256 3984 * 3985 * @param xpos horizontal chroma sample position 3986 * @param ypos vertical chroma sample position 3987 */ 3988 int avcodec_enum_to_chroma_pos(int *xpos, int *ypos, enum AVChromaLocation pos); 3989 3990 /** 3991 * Converts swscale x/y chroma position to AVChromaLocation. 3992 * 3993 * The positions represent the chroma (0,0) position in a coordinates system 3994 * with luma (0,0) representing the origin and luma(1,1) representing 256,256 3995 * 3996 * @param xpos horizontal chroma sample position 3997 * @param ypos vertical chroma sample position 3998 */ 3999 enum AVChromaLocation avcodec_chroma_pos_to_enum(int xpos, int ypos); 4000 4001 #if FF_API_OLD_DECODE_AUDIO 4002 /** 4003 * Wrapper function which calls avcodec_decode_audio4. 4004 * 4005 * @deprecated Use avcodec_decode_audio4 instead. 4006 * 4007 * Decode the audio frame of size avpkt->size from avpkt->data into samples. 4008 * Some decoders may support multiple frames in a single AVPacket, such 4009 * decoders would then just decode the first frame. In this case, 4010 * avcodec_decode_audio3 has to be called again with an AVPacket that contains 4011 * the remaining data in order to decode the second frame etc. 4012 * If no frame 4013 * could be outputted, frame_size_ptr is zero. Otherwise, it is the 4014 * decompressed frame size in bytes. 4015 * 4016 * @warning You must set frame_size_ptr to the allocated size of the 4017 * output buffer before calling avcodec_decode_audio3(). 4018 * 4019 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than 4020 * the actual read bytes because some optimized bitstream readers read 32 or 64 4021 * bits at once and could read over the end. 4022 * 4023 * @warning The end of the input buffer avpkt->data should be set to 0 to ensure that 4024 * no overreading happens for damaged MPEG streams. 4025 * 4026 * @warning You must not provide a custom get_buffer() when using 4027 * avcodec_decode_audio3(). Doing so will override it with 4028 * avcodec_default_get_buffer. Use avcodec_decode_audio4() instead, 4029 * which does allow the application to provide a custom get_buffer(). 4030 * 4031 * @note You might have to align the input buffer avpkt->data and output buffer 4032 * samples. The alignment requirements depend on the CPU: On some CPUs it isn't 4033 * necessary at all, on others it won't work at all if not aligned and on others 4034 * it will work but it will have an impact on performance. 4035 * 4036 * In practice, avpkt->data should have 4 byte alignment at minimum and 4037 * samples should be 16 byte aligned unless the CPU doesn't need it 4038 * (AltiVec and SSE do). 4039 * 4040 * @note Codecs which have the CODEC_CAP_DELAY capability set have a delay 4041 * between input and output, these need to be fed with avpkt->data=NULL, 4042 * avpkt->size=0 at the end to return the remaining frames. 4043 * 4044 * @param avctx the codec context 4045 * @param[out] samples the output buffer, sample type in avctx->sample_fmt 4046 * If the sample format is planar, each channel plane will 4047 * be the same size, with no padding between channels. 4048 * @param[in,out] frame_size_ptr the output buffer size in bytes 4049 * @param[in] avpkt The input AVPacket containing the input buffer. 4050 * You can create such packet with av_init_packet() and by then setting 4051 * data and size, some decoders might in addition need other fields. 4052 * All decoders are designed to use the least fields possible though. 4053 * @return On error a negative value is returned, otherwise the number of bytes 4054 * used or zero if no frame data was decompressed (used) from the input AVPacket. 4055 */ 4056 attribute_deprecated int avcodec_decode_audio3(AVCodecContext *avctx, int16_t *samples, 4057 int *frame_size_ptr, 4058 AVPacket *avpkt); 4059 #endif 4060 4061 /** 4062 * Decode the audio frame of size avpkt->size from avpkt->data into frame. 4063 * 4064 * Some decoders may support multiple frames in a single AVPacket. Such 4065 * decoders would then just decode the first frame and the return value would be 4066 * less than the packet size. In this case, avcodec_decode_audio4 has to be 4067 * called again with an AVPacket containing the remaining data in order to 4068 * decode the second frame, etc... Even if no frames are returned, the packet 4069 * needs to be fed to the decoder with remaining data until it is completely 4070 * consumed or an error occurs. 4071 * 4072 * Some decoders (those marked with CODEC_CAP_DELAY) have a delay between input 4073 * and output. This means that for some packets they will not immediately 4074 * produce decoded output and need to be flushed at the end of decoding to get 4075 * all the decoded data. Flushing is done by calling this function with packets 4076 * with avpkt->data set to NULL and avpkt->size set to 0 until it stops 4077 * returning samples. It is safe to flush even those decoders that are not 4078 * marked with CODEC_CAP_DELAY, then no samples will be returned. 4079 * 4080 * @warning The input buffer, avpkt->data must be FF_INPUT_BUFFER_PADDING_SIZE 4081 * larger than the actual read bytes because some optimized bitstream 4082 * readers read 32 or 64 bits at once and could read over the end. 4083 * 4084 * @param avctx the codec context 4085 * @param[out] frame The AVFrame in which to store decoded audio samples. 4086 * The decoder will allocate a buffer for the decoded frame by 4087 * calling the AVCodecContext.get_buffer2() callback. 4088 * When AVCodecContext.refcounted_frames is set to 1, the frame is 4089 * reference counted and the returned reference belongs to the 4090 * caller. The caller must release the frame using av_frame_unref() 4091 * when the frame is no longer needed. The caller may safely write 4092 * to the frame if av_frame_is_writable() returns 1. 4093 * When AVCodecContext.refcounted_frames is set to 0, the returned 4094 * reference belongs to the decoder and is valid only until the 4095 * next call to this function or until closing or flushing the 4096 * decoder. The caller may not write to it. 4097 * @param[out] got_frame_ptr Zero if no frame could be decoded, otherwise it is 4098 * non-zero. Note that this field being set to zero 4099 * does not mean that an error has occurred. For 4100 * decoders with CODEC_CAP_DELAY set, no given decode 4101 * call is guaranteed to produce a frame. 4102 * @param[in] avpkt The input AVPacket containing the input buffer. 4103 * At least avpkt->data and avpkt->size should be set. Some 4104 * decoders might also require additional fields to be set. 4105 * @return A negative error code is returned if an error occurred during 4106 * decoding, otherwise the number of bytes consumed from the input 4107 * AVPacket is returned. 4108 */ 4109 int avcodec_decode_audio4(AVCodecContext *avctx, AVFrame *frame, 4110 int *got_frame_ptr, const AVPacket *avpkt); 4111 4112 /** 4113 * Decode the video frame of size avpkt->size from avpkt->data into picture. 4114 * Some decoders may support multiple frames in a single AVPacket, such 4115 * decoders would then just decode the first frame. 4116 * 4117 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than 4118 * the actual read bytes because some optimized bitstream readers read 32 or 64 4119 * bits at once and could read over the end. 4120 * 4121 * @warning The end of the input buffer buf should be set to 0 to ensure that 4122 * no overreading happens for damaged MPEG streams. 4123 * 4124 * @note Codecs which have the CODEC_CAP_DELAY capability set have a delay 4125 * between input and output, these need to be fed with avpkt->data=NULL, 4126 * avpkt->size=0 at the end to return the remaining frames. 4127 * 4128 * @param avctx the codec context 4129 * @param[out] picture The AVFrame in which the decoded video frame will be stored. 4130 * Use av_frame_alloc() to get an AVFrame. The codec will 4131 * allocate memory for the actual bitmap by calling the 4132 * AVCodecContext.get_buffer2() callback. 4133 * When AVCodecContext.refcounted_frames is set to 1, the frame is 4134 * reference counted and the returned reference belongs to the 4135 * caller. The caller must release the frame using av_frame_unref() 4136 * when the frame is no longer needed. The caller may safely write 4137 * to the frame if av_frame_is_writable() returns 1. 4138 * When AVCodecContext.refcounted_frames is set to 0, the returned 4139 * reference belongs to the decoder and is valid only until the 4140 * next call to this function or until closing or flushing the 4141 * decoder. The caller may not write to it. 4142 * 4143 * @param[in] avpkt The input AVPacket containing the input buffer. 4144 * You can create such packet with av_init_packet() and by then setting 4145 * data and size, some decoders might in addition need other fields like 4146 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least 4147 * fields possible. 4148 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero. 4149 * @return On error a negative value is returned, otherwise the number of bytes 4150 * used or zero if no frame could be decompressed. 4151 */ 4152 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture, 4153 int *got_picture_ptr, 4154 const AVPacket *avpkt); 4155 4156 /** 4157 * Decode a subtitle message. 4158 * Return a negative value on error, otherwise return the number of bytes used. 4159 * If no subtitle could be decompressed, got_sub_ptr is zero. 4160 * Otherwise, the subtitle is stored in *sub. 4161 * Note that CODEC_CAP_DR1 is not available for subtitle codecs. This is for 4162 * simplicity, because the performance difference is expect to be negligible 4163 * and reusing a get_buffer written for video codecs would probably perform badly 4164 * due to a potentially very different allocation pattern. 4165 * 4166 * Some decoders (those marked with CODEC_CAP_DELAY) have a delay between input 4167 * and output. This means that for some packets they will not immediately 4168 * produce decoded output and need to be flushed at the end of decoding to get 4169 * all the decoded data. Flushing is done by calling this function with packets 4170 * with avpkt->data set to NULL and avpkt->size set to 0 until it stops 4171 * returning subtitles. It is safe to flush even those decoders that are not 4172 * marked with CODEC_CAP_DELAY, then no subtitles will be returned. 4173 * 4174 * @param avctx the codec context 4175 * @param[out] sub The Preallocated AVSubtitle in which the decoded subtitle will be stored, 4176 * must be freed with avsubtitle_free if *got_sub_ptr is set. 4177 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero. 4178 * @param[in] avpkt The input AVPacket containing the input buffer. 4179 */ 4180 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub, 4181 int *got_sub_ptr, 4182 AVPacket *avpkt); 4183 4184 /** 4185 * @defgroup lavc_parsing Frame parsing 4186 * @{ 4187 */ 4188 4189 enum AVPictureStructure { 4190 AV_PICTURE_STRUCTURE_UNKNOWN, //< unknown 4191 AV_PICTURE_STRUCTURE_TOP_FIELD, //< coded as top field 4192 AV_PICTURE_STRUCTURE_BOTTOM_FIELD, //< coded as bottom field 4193 AV_PICTURE_STRUCTURE_FRAME, //< coded as frame 4194 }; 4195 4196 typedef struct AVCodecParserContext { 4197 void *priv_data; 4198 struct AVCodecParser *parser; 4199 int64_t frame_offset; /* offset of the current frame */ 4200 int64_t cur_offset; /* current offset 4201 (incremented by each av_parser_parse()) */ 4202 int64_t next_frame_offset; /* offset of the next frame */ 4203 /* video info */ 4204 int pict_type; /* XXX: Put it back in AVCodecContext. */ 4205 /** 4206 * This field is used for proper frame duration computation in lavf. 4207 * It signals, how much longer the frame duration of the current frame 4208 * is compared to normal frame duration. 4209 * 4210 * frame_duration = (1 + repeat_pict) * time_base 4211 * 4212 * It is used by codecs like H.264 to display telecined material. 4213 */ 4214 int repeat_pict; /* XXX: Put it back in AVCodecContext. */ 4215 int64_t pts; /* pts of the current frame */ 4216 int64_t dts; /* dts of the current frame */ 4217 4218 /* private data */ 4219 int64_t last_pts; 4220 int64_t last_dts; 4221 int fetch_timestamp; 4222 4223 #define AV_PARSER_PTS_NB 4 4224 int cur_frame_start_index; 4225 int64_t cur_frame_offset[AV_PARSER_PTS_NB]; 4226 int64_t cur_frame_pts[AV_PARSER_PTS_NB]; 4227 int64_t cur_frame_dts[AV_PARSER_PTS_NB]; 4228 4229 int flags; 4230 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001 4231 #define PARSER_FLAG_ONCE 0x0002 4232 /// Set if the parser has a valid file offset 4233 #define PARSER_FLAG_FETCHED_OFFSET 0x0004 4234 #define PARSER_FLAG_USE_CODEC_TS 0x1000 4235 4236 int64_t offset; ///< byte offset from starting packet start 4237 int64_t cur_frame_end[AV_PARSER_PTS_NB]; 4238 4239 /** 4240 * Set by parser to 1 for key frames and 0 for non-key frames. 4241 * It is initialized to -1, so if the parser doesn't set this flag, 4242 * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames 4243 * will be used. 4244 */ 4245 int key_frame; 4246 4247 /** 4248 * Time difference in stream time base units from the pts of this 4249 * packet to the point at which the output from the decoder has converged 4250 * independent from the availability of previous frames. That is, the 4251 * frames are virtually identical no matter if decoding started from 4252 * the very first frame or from this keyframe. 4253 * Is AV_NOPTS_VALUE if unknown. 4254 * This field is not the display duration of the current frame. 4255 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY 4256 * set. 4257 * 4258 * The purpose of this field is to allow seeking in streams that have no 4259 * keyframes in the conventional sense. It corresponds to the 4260 * recovery point SEI in H.264 and match_time_delta in NUT. It is also 4261 * essential for some types of subtitle streams to ensure that all 4262 * subtitles are correctly displayed after seeking. 4263 */ 4264 int64_t convergence_duration; 4265 4266 // Timestamp generation support: 4267 /** 4268 * Synchronization point for start of timestamp generation. 4269 * 4270 * Set to >0 for sync point, 0 for no sync point and <0 for undefined 4271 * (default). 4272 * 4273 * For example, this corresponds to presence of H.264 buffering period 4274 * SEI message. 4275 */ 4276 int dts_sync_point; 4277 4278 /** 4279 * Offset of the current timestamp against last timestamp sync point in 4280 * units of AVCodecContext.time_base. 4281 * 4282 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must 4283 * contain a valid timestamp offset. 4284 * 4285 * Note that the timestamp of sync point has usually a nonzero 4286 * dts_ref_dts_delta, which refers to the previous sync point. Offset of 4287 * the next frame after timestamp sync point will be usually 1. 4288 * 4289 * For example, this corresponds to H.264 cpb_removal_delay. 4290 */ 4291 int dts_ref_dts_delta; 4292 4293 /** 4294 * Presentation delay of current frame in units of AVCodecContext.time_base. 4295 * 4296 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must 4297 * contain valid non-negative timestamp delta (presentation time of a frame 4298 * must not lie in the past). 4299 * 4300 * This delay represents the difference between decoding and presentation 4301 * time of the frame. 4302 * 4303 * For example, this corresponds to H.264 dpb_output_delay. 4304 */ 4305 int pts_dts_delta; 4306 4307 /** 4308 * Position of the packet in file. 4309 * 4310 * Analogous to cur_frame_pts/dts 4311 */ 4312 int64_t cur_frame_pos[AV_PARSER_PTS_NB]; 4313 4314 /** 4315 * Byte position of currently parsed frame in stream. 4316 */ 4317 int64_t pos; 4318 4319 /** 4320 * Previous frame byte position. 4321 */ 4322 int64_t last_pos; 4323 4324 /** 4325 * Duration of the current frame. 4326 * For audio, this is in units of 1 / AVCodecContext.sample_rate. 4327 * For all other types, this is in units of AVCodecContext.time_base. 4328 */ 4329 int duration; 4330 4331 enum AVFieldOrder field_order; 4332 4333 /** 4334 * Indicate whether a picture is coded as a frame, top field or bottom field. 4335 * 4336 * For example, H.264 field_pic_flag equal to 0 corresponds to 4337 * AV_PICTURE_STRUCTURE_FRAME. An H.264 picture with field_pic_flag 4338 * equal to 1 and bottom_field_flag equal to 0 corresponds to 4339 * AV_PICTURE_STRUCTURE_TOP_FIELD. 4340 */ 4341 enum AVPictureStructure picture_structure; 4342 4343 /** 4344 * Picture number incremented in presentation or output order. 4345 * This field may be reinitialized at the first picture of a new sequence. 4346 * 4347 * For example, this corresponds to H.264 PicOrderCnt. 4348 */ 4349 int output_picture_number; 4350 } AVCodecParserContext; 4351 4352 typedef struct AVCodecParser { 4353 int codec_ids[5]; /* several codec IDs are permitted */ 4354 int priv_data_size; 4355 int (*parser_init)(AVCodecParserContext *s); 4356 int (*parser_parse)(AVCodecParserContext *s, 4357 AVCodecContext *avctx, 4358 const uint8_t **poutbuf, int *poutbuf_size, 4359 const uint8_t *buf, int buf_size); 4360 void (*parser_close)(AVCodecParserContext *s); 4361 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size); 4362 struct AVCodecParser *next; 4363 } AVCodecParser; 4364 4365 AVCodecParser *av_parser_next(const AVCodecParser *c); 4366 4367 void av_register_codec_parser(AVCodecParser *parser); 4368 AVCodecParserContext *av_parser_init(int codec_id); 4369 4370 /** 4371 * Parse a packet. 4372 * 4373 * @param s parser context. 4374 * @param avctx codec context. 4375 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished. 4376 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished. 4377 * @param buf input buffer. 4378 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output). 4379 * @param pts input presentation timestamp. 4380 * @param dts input decoding timestamp. 4381 * @param pos input byte position in stream. 4382 * @return the number of bytes of the input bitstream used. 4383 * 4384 * Example: 4385 * @code 4386 * while(in_len){ 4387 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size, 4388 * in_data, in_len, 4389 * pts, dts, pos); 4390 * in_data += len; 4391 * in_len -= len; 4392 * 4393 * if(size) 4394 * decode_frame(data, size); 4395 * } 4396 * @endcode 4397 */ 4398 int av_parser_parse2(AVCodecParserContext *s, 4399 AVCodecContext *avctx, 4400 uint8_t **poutbuf, int *poutbuf_size, 4401 const uint8_t *buf, int buf_size, 4402 int64_t pts, int64_t dts, 4403 int64_t pos); 4404 4405 /** 4406 * @return 0 if the output buffer is a subset of the input, 1 if it is allocated and must be freed 4407 * @deprecated use AVBitStreamFilter 4408 */ 4409 int av_parser_change(AVCodecParserContext *s, 4410 AVCodecContext *avctx, 4411 uint8_t **poutbuf, int *poutbuf_size, 4412 const uint8_t *buf, int buf_size, int keyframe); 4413 void av_parser_close(AVCodecParserContext *s); 4414 4415 /** 4416 * @} 4417 * @} 4418 */ 4419 4420 /** 4421 * @addtogroup lavc_encoding 4422 * @{ 4423 */ 4424 4425 /** 4426 * Find a registered encoder with a matching codec ID. 4427 * 4428 * @param id AVCodecID of the requested encoder 4429 * @return An encoder if one was found, NULL otherwise. 4430 */ 4431 AVCodec *avcodec_find_encoder(enum AVCodecID id); 4432 4433 /** 4434 * Find a registered encoder with the specified name. 4435 * 4436 * @param name name of the requested encoder 4437 * @return An encoder if one was found, NULL otherwise. 4438 */ 4439 AVCodec *avcodec_find_encoder_by_name(const char *name); 4440 4441 #if FF_API_OLD_ENCODE_AUDIO 4442 /** 4443 * Encode an audio frame from samples into buf. 4444 * 4445 * @deprecated Use avcodec_encode_audio2 instead. 4446 * 4447 * @note The output buffer should be at least FF_MIN_BUFFER_SIZE bytes large. 4448 * However, for codecs with avctx->frame_size equal to 0 (e.g. PCM) the user 4449 * will know how much space is needed because it depends on the value passed 4450 * in buf_size as described below. In that case a lower value can be used. 4451 * 4452 * @param avctx the codec context 4453 * @param[out] buf the output buffer 4454 * @param[in] buf_size the output buffer size 4455 * @param[in] samples the input buffer containing the samples 4456 * The number of samples read from this buffer is frame_size*channels, 4457 * both of which are defined in avctx. 4458 * For codecs which have avctx->frame_size equal to 0 (e.g. PCM) the number of 4459 * samples read from samples is equal to: 4460 * buf_size * 8 / (avctx->channels * av_get_bits_per_sample(avctx->codec_id)) 4461 * This also implies that av_get_bits_per_sample() must not return 0 for these 4462 * codecs. 4463 * @return On error a negative value is returned, on success zero or the number 4464 * of bytes used to encode the data read from the input buffer. 4465 */ 4466 int attribute_deprecated avcodec_encode_audio(AVCodecContext *avctx, 4467 uint8_t *buf, int buf_size, 4468 const short *samples); 4469 #endif 4470 4471 /** 4472 * Encode a frame of audio. 4473 * 4474 * Takes input samples from frame and writes the next output packet, if 4475 * available, to avpkt. The output packet does not necessarily contain data for 4476 * the most recent frame, as encoders can delay, split, and combine input frames 4477 * internally as needed. 4478 * 4479 * @param avctx codec context 4480 * @param avpkt output AVPacket. 4481 * The user can supply an output buffer by setting 4482 * avpkt->data and avpkt->size prior to calling the 4483 * function, but if the size of the user-provided data is not 4484 * large enough, encoding will fail. If avpkt->data and 4485 * avpkt->size are set, avpkt->destruct must also be set. All 4486 * other AVPacket fields will be reset by the encoder using 4487 * av_init_packet(). If avpkt->data is NULL, the encoder will 4488 * allocate it. The encoder will set avpkt->size to the size 4489 * of the output packet. 4490 * 4491 * If this function fails or produces no output, avpkt will be 4492 * freed using av_free_packet() (i.e. avpkt->destruct will be 4493 * called to free the user supplied buffer). 4494 * @param[in] frame AVFrame containing the raw audio data to be encoded. 4495 * May be NULL when flushing an encoder that has the 4496 * CODEC_CAP_DELAY capability set. 4497 * If CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame 4498 * can have any number of samples. 4499 * If it is not set, frame->nb_samples must be equal to 4500 * avctx->frame_size for all frames except the last. 4501 * The final frame may be smaller than avctx->frame_size. 4502 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the 4503 * output packet is non-empty, and to 0 if it is 4504 * empty. If the function returns an error, the 4505 * packet can be assumed to be invalid, and the 4506 * value of got_packet_ptr is undefined and should 4507 * not be used. 4508 * @return 0 on success, negative error code on failure 4509 */ 4510 int avcodec_encode_audio2(AVCodecContext *avctx, AVPacket *avpkt, 4511 const AVFrame *frame, int *got_packet_ptr); 4512 4513 #if FF_API_OLD_ENCODE_VIDEO 4514 /** 4515 * @deprecated use avcodec_encode_video2() instead. 4516 * 4517 * Encode a video frame from pict into buf. 4518 * The input picture should be 4519 * stored using a specific format, namely avctx.pix_fmt. 4520 * 4521 * @param avctx the codec context 4522 * @param[out] buf the output buffer for the bitstream of encoded frame 4523 * @param[in] buf_size the size of the output buffer in bytes 4524 * @param[in] pict the input picture to encode 4525 * @return On error a negative value is returned, on success zero or the number 4526 * of bytes used from the output buffer. 4527 */ 4528 attribute_deprecated 4529 int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size, 4530 const AVFrame *pict); 4531 #endif 4532 4533 /** 4534 * Encode a frame of video. 4535 * 4536 * Takes input raw video data from frame and writes the next output packet, if 4537 * available, to avpkt. The output packet does not necessarily contain data for 4538 * the most recent frame, as encoders can delay and reorder input frames 4539 * internally as needed. 4540 * 4541 * @param avctx codec context 4542 * @param avpkt output AVPacket. 4543 * The user can supply an output buffer by setting 4544 * avpkt->data and avpkt->size prior to calling the 4545 * function, but if the size of the user-provided data is not 4546 * large enough, encoding will fail. All other AVPacket fields 4547 * will be reset by the encoder using av_init_packet(). If 4548 * avpkt->data is NULL, the encoder will allocate it. 4549 * The encoder will set avpkt->size to the size of the 4550 * output packet. The returned data (if any) belongs to the 4551 * caller, he is responsible for freeing it. 4552 * 4553 * If this function fails or produces no output, avpkt will be 4554 * freed using av_free_packet() (i.e. avpkt->destruct will be 4555 * called to free the user supplied buffer). 4556 * @param[in] frame AVFrame containing the raw video data to be encoded. 4557 * May be NULL when flushing an encoder that has the 4558 * CODEC_CAP_DELAY capability set. 4559 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the 4560 * output packet is non-empty, and to 0 if it is 4561 * empty. If the function returns an error, the 4562 * packet can be assumed to be invalid, and the 4563 * value of got_packet_ptr is undefined and should 4564 * not be used. 4565 * @return 0 on success, negative error code on failure 4566 */ 4567 int avcodec_encode_video2(AVCodecContext *avctx, AVPacket *avpkt, 4568 const AVFrame *frame, int *got_packet_ptr); 4569 4570 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size, 4571 const AVSubtitle *sub); 4572 4573 4574 /** 4575 * @} 4576 */ 4577 4578 #if FF_API_AVCODEC_RESAMPLE 4579 /** 4580 * @defgroup lavc_resample Audio resampling 4581 * @ingroup libavc 4582 * @deprecated use libswresample instead 4583 * 4584 * @{ 4585 */ 4586 struct ReSampleContext; 4587 struct AVResampleContext; 4588 4589 typedef struct ReSampleContext ReSampleContext; 4590 4591 /** 4592 * Initialize audio resampling context. 4593 * 4594 * @param output_channels number of output channels 4595 * @param input_channels number of input channels 4596 * @param output_rate output sample rate 4597 * @param input_rate input sample rate 4598 * @param sample_fmt_out requested output sample format 4599 * @param sample_fmt_in input sample format 4600 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff frequency 4601 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank 4602 * @param linear if 1 then the used FIR filter will be linearly interpolated 4603 between the 2 closest, if 0 the closest will be used 4604 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate 4605 * @return allocated ReSampleContext, NULL if error occurred 4606 */ 4607 attribute_deprecated 4608 ReSampleContext *av_audio_resample_init(int output_channels, int input_channels, 4609 int output_rate, int input_rate, 4610 enum AVSampleFormat sample_fmt_out, 4611 enum AVSampleFormat sample_fmt_in, 4612 int filter_length, int log2_phase_count, 4613 int linear, double cutoff); 4614 4615 attribute_deprecated 4616 int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples); 4617 4618 /** 4619 * Free resample context. 4620 * 4621 * @param s a non-NULL pointer to a resample context previously 4622 * created with av_audio_resample_init() 4623 */ 4624 attribute_deprecated 4625 void audio_resample_close(ReSampleContext *s); 4626 4627 4628 /** 4629 * Initialize an audio resampler. 4630 * Note, if either rate is not an integer then simply scale both rates up so they are. 4631 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq 4632 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank 4633 * @param linear If 1 then the used FIR filter will be linearly interpolated 4634 between the 2 closest, if 0 the closest will be used 4635 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate 4636 */ 4637 attribute_deprecated 4638 struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff); 4639 4640 /** 4641 * Resample an array of samples using a previously configured context. 4642 * @param src an array of unconsumed samples 4643 * @param consumed the number of samples of src which have been consumed are returned here 4644 * @param src_size the number of unconsumed samples available 4645 * @param dst_size the amount of space in samples available in dst 4646 * @param update_ctx If this is 0 then the context will not be modified, that way several channels can be resampled with the same context. 4647 * @return the number of samples written in dst or -1 if an error occurred 4648 */ 4649 attribute_deprecated 4650 int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx); 4651 4652 4653 /** 4654 * Compensate samplerate/timestamp drift. The compensation is done by changing 4655 * the resampler parameters, so no audible clicks or similar distortions occur 4656 * @param compensation_distance distance in output samples over which the compensation should be performed 4657 * @param sample_delta number of output samples which should be output less 4658 * 4659 * example: av_resample_compensate(c, 10, 500) 4660 * here instead of 510 samples only 500 samples would be output 4661 * 4662 * note, due to rounding the actual compensation might be slightly different, 4663 * especially if the compensation_distance is large and the in_rate used during init is small 4664 */ 4665 attribute_deprecated 4666 void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance); 4667 attribute_deprecated 4668 void av_resample_close(struct AVResampleContext *c); 4669 4670 /** 4671 * @} 4672 */ 4673 #endif 4674 4675 /** 4676 * @addtogroup lavc_picture 4677 * @{ 4678 */ 4679 4680 /** 4681 * Allocate memory for the pixels of a picture and setup the AVPicture 4682 * fields for it. 4683 * 4684 * Call avpicture_free() to free it. 4685 * 4686 * @param picture the picture structure to be filled in 4687 * @param pix_fmt the pixel format of the picture 4688 * @param width the width of the picture 4689 * @param height the height of the picture 4690 * @return zero if successful, a negative error code otherwise 4691 * 4692 * @see av_image_alloc(), avpicture_fill() 4693 */ 4694 int avpicture_alloc(AVPicture *picture, enum AVPixelFormat pix_fmt, int width, int height); 4695 4696 /** 4697 * Free a picture previously allocated by avpicture_alloc(). 4698 * The data buffer used by the AVPicture is freed, but the AVPicture structure 4699 * itself is not. 4700 * 4701 * @param picture the AVPicture to be freed 4702 */ 4703 void avpicture_free(AVPicture *picture); 4704 4705 /** 4706 * Setup the picture fields based on the specified image parameters 4707 * and the provided image data buffer. 4708 * 4709 * The picture fields are filled in by using the image data buffer 4710 * pointed to by ptr. 4711 * 4712 * If ptr is NULL, the function will fill only the picture linesize 4713 * array and return the required size for the image buffer. 4714 * 4715 * To allocate an image buffer and fill the picture data in one call, 4716 * use avpicture_alloc(). 4717 * 4718 * @param picture the picture to be filled in 4719 * @param ptr buffer where the image data is stored, or NULL 4720 * @param pix_fmt the pixel format of the image 4721 * @param width the width of the image in pixels 4722 * @param height the height of the image in pixels 4723 * @return the size in bytes required for src, a negative error code 4724 * in case of failure 4725 * 4726 * @see av_image_fill_arrays() 4727 */ 4728 int avpicture_fill(AVPicture *picture, const uint8_t *ptr, 4729 enum AVPixelFormat pix_fmt, int width, int height); 4730 4731 /** 4732 * Copy pixel data from an AVPicture into a buffer. 4733 * 4734 * avpicture_get_size() can be used to compute the required size for 4735 * the buffer to fill. 4736 * 4737 * @param src source picture with filled data 4738 * @param pix_fmt picture pixel format 4739 * @param width picture width 4740 * @param height picture height 4741 * @param dest destination buffer 4742 * @param dest_size destination buffer size in bytes 4743 * @return the number of bytes written to dest, or a negative value 4744 * (error code) on error, for example if the destination buffer is not 4745 * big enough 4746 * 4747 * @see av_image_copy_to_buffer() 4748 */ 4749 int avpicture_layout(const AVPicture *src, enum AVPixelFormat pix_fmt, 4750 int width, int height, 4751 unsigned char *dest, int dest_size); 4752 4753 /** 4754 * Calculate the size in bytes that a picture of the given width and height 4755 * would occupy if stored in the given picture format. 4756 * 4757 * @param pix_fmt picture pixel format 4758 * @param width picture width 4759 * @param height picture height 4760 * @return the computed picture buffer size or a negative error code 4761 * in case of error 4762 * 4763 * @see av_image_get_buffer_size(). 4764 */ 4765 int avpicture_get_size(enum AVPixelFormat pix_fmt, int width, int height); 4766 4767 #if FF_API_DEINTERLACE 4768 /** 4769 * deinterlace - if not supported return -1 4770 * 4771 * @deprecated - use yadif (in libavfilter) instead 4772 */ 4773 attribute_deprecated 4774 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src, 4775 enum AVPixelFormat pix_fmt, int width, int height); 4776 #endif 4777 /** 4778 * Copy image src to dst. Wraps av_image_copy(). 4779 */ 4780 void av_picture_copy(AVPicture *dst, const AVPicture *src, 4781 enum AVPixelFormat pix_fmt, int width, int height); 4782 4783 /** 4784 * Crop image top and left side. 4785 */ 4786 int av_picture_crop(AVPicture *dst, const AVPicture *src, 4787 enum AVPixelFormat pix_fmt, int top_band, int left_band); 4788 4789 /** 4790 * Pad image. 4791 */ 4792 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum AVPixelFormat pix_fmt, 4793 int padtop, int padbottom, int padleft, int padright, int *color); 4794 4795 /** 4796 * @} 4797 */ 4798 4799 /** 4800 * @defgroup lavc_misc Utility functions 4801 * @ingroup libavc 4802 * 4803 * Miscellaneous utility functions related to both encoding and decoding 4804 * (or neither). 4805 * @{ 4806 */ 4807 4808 /** 4809 * @defgroup lavc_misc_pixfmt Pixel formats 4810 * 4811 * Functions for working with pixel formats. 4812 * @{ 4813 */ 4814 4815 /** 4816 * Utility function to access log2_chroma_w log2_chroma_h from 4817 * the pixel format AVPixFmtDescriptor. 4818 * 4819 * This function asserts that pix_fmt is valid. See av_pix_fmt_get_chroma_sub_sample 4820 * for one that returns a failure code and continues in case of invalid 4821 * pix_fmts. 4822 * 4823 * @param[in] pix_fmt the pixel format 4824 * @param[out] h_shift store log2_chroma_w 4825 * @param[out] v_shift store log2_chroma_h 4826 * 4827 * @see av_pix_fmt_get_chroma_sub_sample 4828 */ 4829 4830 void avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift); 4831 4832 /** 4833 * Return a value representing the fourCC code associated to the 4834 * pixel format pix_fmt, or 0 if no associated fourCC code can be 4835 * found. 4836 */ 4837 unsigned int avcodec_pix_fmt_to_codec_tag(enum AVPixelFormat pix_fmt); 4838 4839 /** 4840 * @deprecated see av_get_pix_fmt_loss() 4841 */ 4842 int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt, enum AVPixelFormat src_pix_fmt, 4843 int has_alpha); 4844 4845 /** 4846 * Find the best pixel format to convert to given a certain source pixel 4847 * format. When converting from one pixel format to another, information loss 4848 * may occur. For example, when converting from RGB24 to GRAY, the color 4849 * information will be lost. Similarly, other losses occur when converting from 4850 * some formats to other formats. avcodec_find_best_pix_fmt_of_2() searches which of 4851 * the given pixel formats should be used to suffer the least amount of loss. 4852 * The pixel formats from which it chooses one, are determined by the 4853 * pix_fmt_list parameter. 4854 * 4855 * 4856 * @param[in] pix_fmt_list AV_PIX_FMT_NONE terminated array of pixel formats to choose from 4857 * @param[in] src_pix_fmt source pixel format 4858 * @param[in] has_alpha Whether the source pixel format alpha channel is used. 4859 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur. 4860 * @return The best pixel format to convert to or -1 if none was found. 4861 */ 4862 enum AVPixelFormat avcodec_find_best_pix_fmt_of_list(const enum AVPixelFormat *pix_fmt_list, 4863 enum AVPixelFormat src_pix_fmt, 4864 int has_alpha, int *loss_ptr); 4865 4866 /** 4867 * @deprecated see av_find_best_pix_fmt_of_2() 4868 */ 4869 enum AVPixelFormat avcodec_find_best_pix_fmt_of_2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2, 4870 enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr); 4871 4872 attribute_deprecated 4873 #if AV_HAVE_INCOMPATIBLE_LIBAV_ABI 4874 enum AVPixelFormat avcodec_find_best_pix_fmt2(const enum AVPixelFormat *pix_fmt_list, 4875 enum AVPixelFormat src_pix_fmt, 4876 int has_alpha, int *loss_ptr); 4877 #else 4878 enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2, 4879 enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr); 4880 #endif 4881 4882 4883 enum AVPixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum AVPixelFormat * fmt); 4884 4885 /** 4886 * @} 4887 */ 4888 4889 #if FF_API_SET_DIMENSIONS 4890 /** 4891 * @deprecated this function is not supposed to be used from outside of lavc 4892 */ 4893 attribute_deprecated 4894 void avcodec_set_dimensions(AVCodecContext *s, int width, int height); 4895 #endif 4896 4897 /** 4898 * Put a string representing the codec tag codec_tag in buf. 4899 * 4900 * @param buf buffer to place codec tag in 4901 * @param buf_size size in bytes of buf 4902 * @param codec_tag codec tag to assign 4903 * @return the length of the string that would have been generated if 4904 * enough space had been available, excluding the trailing null 4905 */ 4906 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag); 4907 4908 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode); 4909 4910 /** 4911 * Return a name for the specified profile, if available. 4912 * 4913 * @param codec the codec that is searched for the given profile 4914 * @param profile the profile value for which a name is requested 4915 * @return A name for the profile if found, NULL otherwise. 4916 */ 4917 const char *av_get_profile_name(const AVCodec *codec, int profile); 4918 4919 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size); 4920 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count); 4921 //FIXME func typedef 4922 4923 /** 4924 * Fill AVFrame audio data and linesize pointers. 4925 * 4926 * The buffer buf must be a preallocated buffer with a size big enough 4927 * to contain the specified samples amount. The filled AVFrame data 4928 * pointers will point to this buffer. 4929 * 4930 * AVFrame extended_data channel pointers are allocated if necessary for 4931 * planar audio. 4932 * 4933 * @param frame the AVFrame 4934 * frame->nb_samples must be set prior to calling the 4935 * function. This function fills in frame->data, 4936 * frame->extended_data, frame->linesize[0]. 4937 * @param nb_channels channel count 4938 * @param sample_fmt sample format 4939 * @param buf buffer to use for frame data 4940 * @param buf_size size of buffer 4941 * @param align plane size sample alignment (0 = default) 4942 * @return >=0 on success, negative error code on failure 4943 * @todo return the size in bytes required to store the samples in 4944 * case of success, at the next libavutil bump 4945 */ 4946 int avcodec_fill_audio_frame(AVFrame *frame, int nb_channels, 4947 enum AVSampleFormat sample_fmt, const uint8_t *buf, 4948 int buf_size, int align); 4949 4950 /** 4951 * Reset the internal decoder state / flush internal buffers. Should be called 4952 * e.g. when seeking or when switching to a different stream. 4953 * 4954 * @note when refcounted frames are not used (i.e. avctx->refcounted_frames is 0), 4955 * this invalidates the frames previously returned from the decoder. When 4956 * refcounted frames are used, the decoder just releases any references it might 4957 * keep internally, but the caller's reference remains valid. 4958 */ 4959 void avcodec_flush_buffers(AVCodecContext *avctx); 4960 4961 /** 4962 * Return codec bits per sample. 4963 * 4964 * @param[in] codec_id the codec 4965 * @return Number of bits per sample or zero if unknown for the given codec. 4966 */ 4967 int av_get_bits_per_sample(enum AVCodecID codec_id); 4968 4969 /** 4970 * Return the PCM codec associated with a sample format. 4971 * @param be endianness, 0 for little, 1 for big, 4972 * -1 (or anything else) for native 4973 * @return AV_CODEC_ID_PCM_* or AV_CODEC_ID_NONE 4974 */ 4975 enum AVCodecID av_get_pcm_codec(enum AVSampleFormat fmt, int be); 4976 4977 /** 4978 * Return codec bits per sample. 4979 * Only return non-zero if the bits per sample is exactly correct, not an 4980 * approximation. 4981 * 4982 * @param[in] codec_id the codec 4983 * @return Number of bits per sample or zero if unknown for the given codec. 4984 */ 4985 int av_get_exact_bits_per_sample(enum AVCodecID codec_id); 4986 4987 /** 4988 * Return audio frame duration. 4989 * 4990 * @param avctx codec context 4991 * @param frame_bytes size of the frame, or 0 if unknown 4992 * @return frame duration, in samples, if known. 0 if not able to 4993 * determine. 4994 */ 4995 int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes); 4996 4997 4998 typedef struct AVBitStreamFilterContext { 4999 void *priv_data; 5000 struct AVBitStreamFilter *filter; 5001 AVCodecParserContext *parser; 5002 struct AVBitStreamFilterContext *next; 5003 } AVBitStreamFilterContext; 5004 5005 5006 typedef struct AVBitStreamFilter { 5007 const char *name; 5008 int priv_data_size; 5009 int (*filter)(AVBitStreamFilterContext *bsfc, 5010 AVCodecContext *avctx, const char *args, 5011 uint8_t **poutbuf, int *poutbuf_size, 5012 const uint8_t *buf, int buf_size, int keyframe); 5013 void (*close)(AVBitStreamFilterContext *bsfc); 5014 struct AVBitStreamFilter *next; 5015 } AVBitStreamFilter; 5016 5017 /** 5018 * Register a bitstream filter. 5019 * 5020 * The filter will be accessible to the application code through 5021 * av_bitstream_filter_next() or can be directly initialized with 5022 * av_bitstream_filter_init(). 5023 * 5024 * @see avcodec_register_all() 5025 */ 5026 void av_register_bitstream_filter(AVBitStreamFilter *bsf); 5027 5028 /** 5029 * Create and initialize a bitstream filter context given a bitstream 5030 * filter name. 5031 * 5032 * The returned context must be freed with av_bitstream_filter_close(). 5033 * 5034 * @param name the name of the bitstream filter 5035 * @return a bitstream filter context if a matching filter was found 5036 * and successfully initialized, NULL otherwise 5037 */ 5038 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name); 5039 5040 /** 5041 * Filter bitstream. 5042 * 5043 * This function filters the buffer buf with size buf_size, and places the 5044 * filtered buffer in the buffer pointed to by poutbuf. 5045 * 5046 * The output buffer must be freed by the caller. 5047 * 5048 * @param bsfc bitstream filter context created by av_bitstream_filter_init() 5049 * @param avctx AVCodecContext accessed by the filter, may be NULL. 5050 * If specified, this must point to the encoder context of the 5051 * output stream the packet is sent to. 5052 * @param args arguments which specify the filter configuration, may be NULL 5053 * @param poutbuf pointer which is updated to point to the filtered buffer 5054 * @param poutbuf_size pointer which is updated to the filtered buffer size in bytes 5055 * @param buf buffer containing the data to filter 5056 * @param buf_size size in bytes of buf 5057 * @param keyframe set to non-zero if the buffer to filter corresponds to a key-frame packet data 5058 * @return >= 0 in case of success, or a negative error code in case of failure 5059 * 5060 * If the return value is positive, an output buffer is allocated and 5061 * is available in *poutbuf, and is distinct from the input buffer. 5062 * 5063 * If the return value is 0, the output buffer is not allocated and 5064 * should be considered identical to the input buffer, or in case 5065 * *poutbuf was set it points to the input buffer (not necessarily to 5066 * its starting address). 5067 */ 5068 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc, 5069 AVCodecContext *avctx, const char *args, 5070 uint8_t **poutbuf, int *poutbuf_size, 5071 const uint8_t *buf, int buf_size, int keyframe); 5072 5073 /** 5074 * Release bitstream filter context. 5075 * 5076 * @param bsf the bitstream filter context created with 5077 * av_bitstream_filter_init(), can be NULL 5078 */ 5079 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf); 5080 5081 /** 5082 * If f is NULL, return the first registered bitstream filter, 5083 * if f is non-NULL, return the next registered bitstream filter 5084 * after f, or NULL if f is the last one. 5085 * 5086 * This function can be used to iterate over all registered bitstream 5087 * filters. 5088 */ 5089 AVBitStreamFilter *av_bitstream_filter_next(const AVBitStreamFilter *f); 5090 5091 /* memory */ 5092 5093 /** 5094 * Same behaviour av_fast_malloc but the buffer has additional 5095 * FF_INPUT_BUFFER_PADDING_SIZE at the end which will always be 0. 5096 * 5097 * In addition the whole buffer will initially and after resizes 5098 * be 0-initialized so that no uninitialized data will ever appear. 5099 */ 5100 void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size); 5101 5102 /** 5103 * Same behaviour av_fast_padded_malloc except that buffer will always 5104 * be 0-initialized after call. 5105 */ 5106 void av_fast_padded_mallocz(void *ptr, unsigned int *size, size_t min_size); 5107 5108 /** 5109 * Encode extradata length to a buffer. Used by xiph codecs. 5110 * 5111 * @param s buffer to write to; must be at least (v/255+1) bytes long 5112 * @param v size of extradata in bytes 5113 * @return number of bytes written to the buffer. 5114 */ 5115 unsigned int av_xiphlacing(unsigned char *s, unsigned int v); 5116 5117 #if FF_API_MISSING_SAMPLE 5118 /** 5119 * Log a generic warning message about a missing feature. This function is 5120 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.) 5121 * only, and would normally not be used by applications. 5122 * @param[in] avc a pointer to an arbitrary struct of which the first field is 5123 * a pointer to an AVClass struct 5124 * @param[in] feature string containing the name of the missing feature 5125 * @param[in] want_sample indicates if samples are wanted which exhibit this feature. 5126 * If want_sample is non-zero, additional verbage will be added to the log 5127 * message which tells the user how to report samples to the development 5128 * mailing list. 5129 * @deprecated Use avpriv_report_missing_feature() instead. 5130 */ 5131 attribute_deprecated 5132 void av_log_missing_feature(void *avc, const char *feature, int want_sample); 5133 5134 /** 5135 * Log a generic warning message asking for a sample. This function is 5136 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.) 5137 * only, and would normally not be used by applications. 5138 * @param[in] avc a pointer to an arbitrary struct of which the first field is 5139 * a pointer to an AVClass struct 5140 * @param[in] msg string containing an optional message, or NULL if no message 5141 * @deprecated Use avpriv_request_sample() instead. 5142 */ 5143 attribute_deprecated 5144 void av_log_ask_for_sample(void *avc, const char *msg, ...) av_printf_format(2, 3); 5145 #endif /* FF_API_MISSING_SAMPLE */ 5146 5147 /** 5148 * Register the hardware accelerator hwaccel. 5149 */ 5150 void av_register_hwaccel(AVHWAccel *hwaccel); 5151 5152 /** 5153 * If hwaccel is NULL, returns the first registered hardware accelerator, 5154 * if hwaccel is non-NULL, returns the next registered hardware accelerator 5155 * after hwaccel, or NULL if hwaccel is the last one. 5156 */ 5157 AVHWAccel *av_hwaccel_next(const AVHWAccel *hwaccel); 5158 5159 5160 /** 5161 * Lock operation used by lockmgr 5162 */ 5163 enum AVLockOp { 5164 AV_LOCK_CREATE, ///< Create a mutex 5165 AV_LOCK_OBTAIN, ///< Lock the mutex 5166 AV_LOCK_RELEASE, ///< Unlock the mutex 5167 AV_LOCK_DESTROY, ///< Free mutex resources 5168 }; 5169 5170 /** 5171 * Register a user provided lock manager supporting the operations 5172 * specified by AVLockOp. The "mutex" argument to the function points 5173 * to a (void *) where the lockmgr should store/get a pointer to a user 5174 * allocated mutex. It is NULL upon AV_LOCK_CREATE and equal to the 5175 * value left by the last call for all other ops. If the lock manager is 5176 * unable to perform the op then it should leave the mutex in the same 5177 * state as when it was called and return a non-zero value. However, 5178 * when called with AV_LOCK_DESTROY the mutex will always be assumed to 5179 * have been successfully destroyed. If av_lockmgr_register succeeds 5180 * it will return a non-negative value, if it fails it will return a 5181 * negative value and destroy all mutex and unregister all callbacks. 5182 * av_lockmgr_register is not thread-safe, it must be called from a 5183 * single thread before any calls which make use of locking are used. 5184 * 5185 * @param cb User defined callback. av_lockmgr_register invokes calls 5186 * to this callback and the previously registered callback. 5187 * The callback will be used to create more than one mutex 5188 * each of which must be backed by its own underlying locking 5189 * mechanism (i.e. do not use a single static object to 5190 * implement your lock manager). If cb is set to NULL the 5191 * lockmgr will be unregistered. 5192 */ 5193 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op)); 5194 5195 /** 5196 * Get the type of the given codec. 5197 */ 5198 enum AVMediaType avcodec_get_type(enum AVCodecID codec_id); 5199 5200 /** 5201 * Get the name of a codec. 5202 * @return a static string identifying the codec; never NULL 5203 */ 5204 const char *avcodec_get_name(enum AVCodecID id); 5205 5206 /** 5207 * @return a positive value if s is open (i.e. avcodec_open2() was called on it 5208 * with no corresponding avcodec_close()), 0 otherwise. 5209 */ 5210 int avcodec_is_open(AVCodecContext *s); 5211 5212 /** 5213 * @return a non-zero number if codec is an encoder, zero otherwise 5214 */ 5215 int av_codec_is_encoder(const AVCodec *codec); 5216 5217 /** 5218 * @return a non-zero number if codec is a decoder, zero otherwise 5219 */ 5220 int av_codec_is_decoder(const AVCodec *codec); 5221 5222 /** 5223 * @return descriptor for given codec ID or NULL if no descriptor exists. 5224 */ 5225 const AVCodecDescriptor *avcodec_descriptor_get(enum AVCodecID id); 5226 5227 /** 5228 * Iterate over all codec descriptors known to libavcodec. 5229 * 5230 * @param prev previous descriptor. NULL to get the first descriptor. 5231 * 5232 * @return next descriptor or NULL after the last descriptor 5233 */ 5234 const AVCodecDescriptor *avcodec_descriptor_next(const AVCodecDescriptor *prev); 5235 5236 /** 5237 * @return codec descriptor with the given name or NULL if no such descriptor 5238 * exists. 5239 */ 5240 const AVCodecDescriptor *avcodec_descriptor_get_by_name(const char *name); 5241 5242 /** 5243 * @} 5244 */ 5245 5246 #endif /* AVCODEC_AVCODEC_H */ 5247