1 /***************************************************************************** 2 * x264.h: x264 public header 3 ***************************************************************************** 4 * Copyright (C) 2003-2021 x264 project 5 * 6 * Authors: Laurent Aimar <fenrir@via.ecp.fr> 7 * Loren Merritt <lorenm@u.washington.edu> 8 * Fiona Glaser <fiona@x264.com> 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License as published by 12 * the Free Software Foundation; either version 2 of the License, or 13 * (at your option) any later version. 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 * GNU General Public License for more details. 19 * 20 * You should have received a copy of the GNU General Public License 21 * along with this program; if not, write to the Free Software 22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111, USA. 23 * 24 * This program is also available under a commercial proprietary license. 25 * For more information, contact us at licensing@x264.com. 26 *****************************************************************************/ 27 28 #ifndef X264_X264_H 29 #define X264_X264_H 30 31 #ifdef __cplusplus 32 extern "C" { 33 #endif 34 35 #if !defined(_STDINT_H) && !defined(_STDINT_H_) && !defined(_STDINT_H_INCLUDED) && !defined(_STDINT) &&\ 36 !defined(_SYS_STDINT_H_) && !defined(_INTTYPES_H) && !defined(_INTTYPES_H_) && !defined(_INTTYPES) 37 # ifdef _MSC_VER 38 # pragma message("You must include stdint.h or inttypes.h before x264.h") 39 # else 40 # warning You must include stdint.h or inttypes.h before x264.h 41 # endif 42 #endif 43 44 #include <stdarg.h> 45 46 #include "x264_config.h" 47 48 #define X264_BUILD 163 49 50 #ifdef _WIN32 51 # define X264_DLL_IMPORT __declspec(dllimport) 52 # define X264_DLL_EXPORT __declspec(dllexport) 53 #else 54 # if defined(__GNUC__) && (__GNUC__ >= 4) 55 # define X264_DLL_IMPORT 56 # define X264_DLL_EXPORT __attribute__((visibility("default"))) 57 # else 58 # define X264_DLL_IMPORT 59 # define X264_DLL_EXPORT 60 # endif 61 #endif 62 63 /* Application developers planning to link against a shared library version of 64 * libx264 from a Microsoft Visual Studio or similar development environment 65 * will need to define X264_API_IMPORTS before including this header. 66 * This clause does not apply to MinGW, similar development environments, or non 67 * Windows platforms. */ 68 #ifdef X264_API_IMPORTS 69 # define X264_API X264_DLL_IMPORT 70 #else 71 # ifdef X264_API_EXPORTS 72 # define X264_API X264_DLL_EXPORT 73 # else 74 # define X264_API 75 # endif 76 #endif 77 78 /* x264_t: 79 * opaque handler for encoder */ 80 typedef struct x264_t x264_t; 81 82 /**************************************************************************** 83 * NAL structure and functions 84 ****************************************************************************/ 85 86 enum nal_unit_type_e 87 { 88 NAL_UNKNOWN = 0, 89 NAL_SLICE = 1, 90 NAL_SLICE_DPA = 2, 91 NAL_SLICE_DPB = 3, 92 NAL_SLICE_DPC = 4, 93 NAL_SLICE_IDR = 5, /* ref_idc != 0 */ 94 NAL_SEI = 6, /* ref_idc == 0 */ 95 NAL_SPS = 7, 96 NAL_PPS = 8, 97 NAL_AUD = 9, 98 NAL_FILLER = 12, 99 /* ref_idc == 0 for 6,9,10,11,12 */ 100 }; 101 enum nal_priority_e 102 { 103 NAL_PRIORITY_DISPOSABLE = 0, 104 NAL_PRIORITY_LOW = 1, 105 NAL_PRIORITY_HIGH = 2, 106 NAL_PRIORITY_HIGHEST = 3, 107 }; 108 109 /* The data within the payload is already NAL-encapsulated; the ref_idc and type 110 * are merely in the struct for easy access by the calling application. 111 * All data returned in an x264_nal_t, including the data in p_payload, is no longer 112 * valid after the next call to x264_encoder_encode. Thus it must be used or copied 113 * before calling x264_encoder_encode or x264_encoder_headers again. */ 114 typedef struct x264_nal_t 115 { 116 int i_ref_idc; /* nal_priority_e */ 117 int i_type; /* nal_unit_type_e */ 118 int b_long_startcode; 119 int i_first_mb; /* If this NAL is a slice, the index of the first MB in the slice. */ 120 int i_last_mb; /* If this NAL is a slice, the index of the last MB in the slice. */ 121 122 /* Size of payload (including any padding) in bytes. */ 123 int i_payload; 124 /* If param->b_annexb is set, Annex-B bytestream with startcode. 125 * Otherwise, startcode is replaced with a 4-byte size. 126 * This size is the size used in mp4/similar muxing; it is equal to i_payload-4 */ 127 uint8_t *p_payload; 128 129 /* Size of padding in bytes. */ 130 int i_padding; 131 } x264_nal_t; 132 133 /**************************************************************************** 134 * Encoder parameters 135 ****************************************************************************/ 136 /* CPU flags */ 137 138 /* x86 */ 139 #define X264_CPU_MMX (1U<<0) 140 #define X264_CPU_MMX2 (1U<<1) /* MMX2 aka MMXEXT aka ISSE */ 141 #define X264_CPU_MMXEXT X264_CPU_MMX2 142 #define X264_CPU_SSE (1U<<2) 143 #define X264_CPU_SSE2 (1U<<3) 144 #define X264_CPU_LZCNT (1U<<4) 145 #define X264_CPU_SSE3 (1U<<5) 146 #define X264_CPU_SSSE3 (1U<<6) 147 #define X264_CPU_SSE4 (1U<<7) /* SSE4.1 */ 148 #define X264_CPU_SSE42 (1U<<8) /* SSE4.2 */ 149 #define X264_CPU_AVX (1U<<9) /* Requires OS support even if YMM registers aren't used */ 150 #define X264_CPU_XOP (1U<<10) /* AMD XOP */ 151 #define X264_CPU_FMA4 (1U<<11) /* AMD FMA4 */ 152 #define X264_CPU_FMA3 (1U<<12) 153 #define X264_CPU_BMI1 (1U<<13) 154 #define X264_CPU_BMI2 (1U<<14) 155 #define X264_CPU_AVX2 (1U<<15) 156 #define X264_CPU_AVX512 (1U<<16) /* AVX-512 {F, CD, BW, DQ, VL}, requires OS support */ 157 /* x86 modifiers */ 158 #define X264_CPU_CACHELINE_32 (1U<<17) /* avoid memory loads that span the border between two cachelines */ 159 #define X264_CPU_CACHELINE_64 (1U<<18) /* 32/64 is the size of a cacheline in bytes */ 160 #define X264_CPU_SSE2_IS_SLOW (1U<<19) /* avoid most SSE2 functions on Athlon64 */ 161 #define X264_CPU_SSE2_IS_FAST (1U<<20) /* a few functions are only faster on Core2 and Phenom */ 162 #define X264_CPU_SLOW_SHUFFLE (1U<<21) /* The Conroe has a slow shuffle unit (relative to overall SSE performance) */ 163 #define X264_CPU_STACK_MOD4 (1U<<22) /* if stack is only mod4 and not mod16 */ 164 #define X264_CPU_SLOW_ATOM (1U<<23) /* The Atom is terrible: slow SSE unaligned loads, slow 165 * SIMD multiplies, slow SIMD variable shifts, slow pshufb, 166 * cacheline split penalties -- gather everything here that 167 * isn't shared by other CPUs to avoid making half a dozen 168 * new SLOW flags. */ 169 #define X264_CPU_SLOW_PSHUFB (1U<<24) /* such as on the Intel Atom */ 170 #define X264_CPU_SLOW_PALIGNR (1U<<25) /* such as on the AMD Bobcat */ 171 172 /* PowerPC */ 173 #define X264_CPU_ALTIVEC 0x0000001U 174 175 /* ARM and AArch64 */ 176 #define X264_CPU_ARMV6 0x0000001U 177 #define X264_CPU_NEON 0x0000002U /* ARM NEON */ 178 #define X264_CPU_FAST_NEON_MRC 0x0000004U /* Transfer from NEON to ARM register is fast (Cortex-A9) */ 179 #define X264_CPU_ARMV8 0x0000008U 180 181 /* MIPS */ 182 #define X264_CPU_MSA 0x0000001U /* MIPS MSA */ 183 184 /* Analyse flags */ 185 #define X264_ANALYSE_I4x4 0x0001U /* Analyse i4x4 */ 186 #define X264_ANALYSE_I8x8 0x0002U /* Analyse i8x8 (requires 8x8 transform) */ 187 #define X264_ANALYSE_PSUB16x16 0x0010U /* Analyse p16x8, p8x16 and p8x8 */ 188 #define X264_ANALYSE_PSUB8x8 0x0020U /* Analyse p8x4, p4x8, p4x4 */ 189 #define X264_ANALYSE_BSUB16x16 0x0100U /* Analyse b16x8, b8x16 and b8x8 */ 190 191 #define X264_DIRECT_PRED_NONE 0 192 #define X264_DIRECT_PRED_SPATIAL 1 193 #define X264_DIRECT_PRED_TEMPORAL 2 194 #define X264_DIRECT_PRED_AUTO 3 195 #define X264_ME_DIA 0 196 #define X264_ME_HEX 1 197 #define X264_ME_UMH 2 198 #define X264_ME_ESA 3 199 #define X264_ME_TESA 4 200 #define X264_CQM_FLAT 0 201 #define X264_CQM_JVT 1 202 #define X264_CQM_CUSTOM 2 203 #define X264_RC_CQP 0 204 #define X264_RC_CRF 1 205 #define X264_RC_ABR 2 206 #define X264_QP_AUTO 0 207 #define X264_AQ_NONE 0 208 #define X264_AQ_VARIANCE 1 209 #define X264_AQ_AUTOVARIANCE 2 210 #define X264_AQ_AUTOVARIANCE_BIASED 3 211 #define X264_B_ADAPT_NONE 0 212 #define X264_B_ADAPT_FAST 1 213 #define X264_B_ADAPT_TRELLIS 2 214 #define X264_WEIGHTP_NONE 0 215 #define X264_WEIGHTP_SIMPLE 1 216 #define X264_WEIGHTP_SMART 2 217 #define X264_B_PYRAMID_NONE 0 218 #define X264_B_PYRAMID_STRICT 1 219 #define X264_B_PYRAMID_NORMAL 2 220 #define X264_KEYINT_MIN_AUTO 0 221 #define X264_KEYINT_MAX_INFINITE (1<<30) 222 223 /* AVC-Intra flavors */ 224 #define X264_AVCINTRA_FLAVOR_PANASONIC 0 225 #define X264_AVCINTRA_FLAVOR_SONY 1 226 227 static const char * const x264_direct_pred_names[] = { "none", "spatial", "temporal", "auto", 0 }; 228 static const char * const x264_motion_est_names[] = { "dia", "hex", "umh", "esa", "tesa", 0 }; 229 static const char * const x264_b_pyramid_names[] = { "none", "strict", "normal", 0 }; 230 static const char * const x264_overscan_names[] = { "undef", "show", "crop", 0 }; 231 static const char * const x264_vidformat_names[] = { "component", "pal", "ntsc", "secam", "mac", "undef", 0 }; 232 static const char * const x264_fullrange_names[] = { "off", "on", 0 }; 233 static const char * const x264_colorprim_names[] = { "", "bt709", "undef", "", "bt470m", "bt470bg", "smpte170m", "smpte240m", "film", "bt2020", "smpte428", 234 "smpte431", "smpte432", 0 }; 235 static const char * const x264_transfer_names[] = { "", "bt709", "undef", "", "bt470m", "bt470bg", "smpte170m", "smpte240m", "linear", "log100", "log316", 236 "iec61966-2-4", "bt1361e", "iec61966-2-1", "bt2020-10", "bt2020-12", "smpte2084", "smpte428", "arib-std-b67", 0 }; 237 static const char * const x264_colmatrix_names[] = { "GBR", "bt709", "undef", "", "fcc", "bt470bg", "smpte170m", "smpte240m", "YCgCo", "bt2020nc", "bt2020c", 238 "smpte2085", "chroma-derived-nc", "chroma-derived-c", "ICtCp", 0 }; 239 static const char * const x264_nal_hrd_names[] = { "none", "vbr", "cbr", 0 }; 240 static const char * const x264_avcintra_flavor_names[] = { "panasonic", "sony", 0 }; 241 242 /* Colorspace type */ 243 #define X264_CSP_MASK 0x00ff /* */ 244 #define X264_CSP_NONE 0x0000 /* Invalid mode */ 245 #define X264_CSP_I400 0x0001 /* monochrome 4:0:0 */ 246 #define X264_CSP_I420 0x0002 /* yuv 4:2:0 planar */ 247 #define X264_CSP_YV12 0x0003 /* yvu 4:2:0 planar */ 248 #define X264_CSP_NV12 0x0004 /* yuv 4:2:0, with one y plane and one packed u+v */ 249 #define X264_CSP_NV21 0x0005 /* yuv 4:2:0, with one y plane and one packed v+u */ 250 #define X264_CSP_I422 0x0006 /* yuv 4:2:2 planar */ 251 #define X264_CSP_YV16 0x0007 /* yvu 4:2:2 planar */ 252 #define X264_CSP_NV16 0x0008 /* yuv 4:2:2, with one y plane and one packed u+v */ 253 #define X264_CSP_YUYV 0x0009 /* yuyv 4:2:2 packed */ 254 #define X264_CSP_UYVY 0x000a /* uyvy 4:2:2 packed */ 255 #define X264_CSP_V210 0x000b /* 10-bit yuv 4:2:2 packed in 32 */ 256 #define X264_CSP_I444 0x000c /* yuv 4:4:4 planar */ 257 #define X264_CSP_YV24 0x000d /* yvu 4:4:4 planar */ 258 #define X264_CSP_BGR 0x000e /* packed bgr 24bits */ 259 #define X264_CSP_BGRA 0x000f /* packed bgr 32bits */ 260 #define X264_CSP_RGB 0x0010 /* packed rgb 24bits */ 261 #define X264_CSP_MAX 0x0011 /* end of list */ 262 #define X264_CSP_VFLIP 0x1000 /* the csp is vertically flipped */ 263 #define X264_CSP_HIGH_DEPTH 0x2000 /* the csp has a depth of 16 bits per pixel component */ 264 265 /* Slice type */ 266 #define X264_TYPE_AUTO 0x0000 /* Let x264 choose the right type */ 267 #define X264_TYPE_IDR 0x0001 268 #define X264_TYPE_I 0x0002 269 #define X264_TYPE_P 0x0003 270 #define X264_TYPE_BREF 0x0004 /* Non-disposable B-frame */ 271 #define X264_TYPE_B 0x0005 272 #define X264_TYPE_KEYFRAME 0x0006 /* IDR or I depending on b_open_gop option */ 273 #define IS_X264_TYPE_I(x) ((x)==X264_TYPE_I || (x)==X264_TYPE_IDR || (x)==X264_TYPE_KEYFRAME) 274 #define IS_X264_TYPE_B(x) ((x)==X264_TYPE_B || (x)==X264_TYPE_BREF) 275 276 /* Log level */ 277 #define X264_LOG_NONE (-1) 278 #define X264_LOG_ERROR 0 279 #define X264_LOG_WARNING 1 280 #define X264_LOG_INFO 2 281 #define X264_LOG_DEBUG 3 282 283 /* Threading */ 284 #define X264_THREADS_AUTO 0 /* Automatically select optimal number of threads */ 285 #define X264_SYNC_LOOKAHEAD_AUTO (-1) /* Automatically select optimal lookahead thread buffer size */ 286 287 /* HRD */ 288 #define X264_NAL_HRD_NONE 0 289 #define X264_NAL_HRD_VBR 1 290 #define X264_NAL_HRD_CBR 2 291 292 /* Zones: override ratecontrol or other options for specific sections of the video. 293 * See x264_encoder_reconfig() for which options can be changed. 294 * If zones overlap, whichever comes later in the list takes precedence. */ 295 typedef struct x264_zone_t 296 { 297 int i_start, i_end; /* range of frame numbers */ 298 int b_force_qp; /* whether to use qp vs bitrate factor */ 299 int i_qp; 300 float f_bitrate_factor; 301 struct x264_param_t *param; 302 } x264_zone_t; 303 304 typedef struct x264_param_t 305 { 306 /* CPU flags */ 307 uint32_t cpu; 308 int i_threads; /* encode multiple frames in parallel */ 309 int i_lookahead_threads; /* multiple threads for lookahead analysis */ 310 int b_sliced_threads; /* Whether to use slice-based threading. */ 311 int b_deterministic; /* whether to allow non-deterministic optimizations when threaded */ 312 int b_cpu_independent; /* force canonical behavior rather than cpu-dependent optimal algorithms */ 313 int i_sync_lookahead; /* threaded lookahead buffer */ 314 315 /* Video Properties */ 316 int i_width; 317 int i_height; 318 int i_csp; /* CSP of encoded bitstream */ 319 int i_bitdepth; 320 int i_level_idc; 321 int i_frame_total; /* number of frames to encode if known, else 0 */ 322 323 /* NAL HRD 324 * Uses Buffering and Picture Timing SEIs to signal HRD 325 * The HRD in H.264 was not designed with VFR in mind. 326 * It is therefore not recommendeded to use NAL HRD with VFR. 327 * Furthermore, reconfiguring the VBV (via x264_encoder_reconfig) 328 * will currently generate invalid HRD. */ 329 int i_nal_hrd; 330 331 struct 332 { 333 /* they will be reduced to be 0 < x <= 65535 and prime */ 334 int i_sar_height; 335 int i_sar_width; 336 337 int i_overscan; /* 0=undef, 1=no overscan, 2=overscan */ 338 339 /* see h264 annex E for the values of the following */ 340 int i_vidformat; 341 int b_fullrange; 342 int i_colorprim; 343 int i_transfer; 344 int i_colmatrix; 345 int i_chroma_loc; /* both top & bottom */ 346 } vui; 347 348 /* Bitstream parameters */ 349 int i_frame_reference; /* Maximum number of reference frames */ 350 int i_dpb_size; /* Force a DPB size larger than that implied by B-frames and reference frames. 351 * Useful in combination with interactive error resilience. */ 352 int i_keyint_max; /* Force an IDR keyframe at this interval */ 353 int i_keyint_min; /* Scenecuts closer together than this are coded as I, not IDR. */ 354 int i_scenecut_threshold; /* how aggressively to insert extra I frames */ 355 int b_intra_refresh; /* Whether or not to use periodic intra refresh instead of IDR frames. */ 356 357 int i_bframe; /* how many b-frame between 2 references pictures */ 358 int i_bframe_adaptive; 359 int i_bframe_bias; 360 int i_bframe_pyramid; /* Keep some B-frames as references: 0=off, 1=strict hierarchical, 2=normal */ 361 int b_open_gop; 362 int b_bluray_compat; 363 int i_avcintra_class; 364 int i_avcintra_flavor; 365 366 int b_deblocking_filter; 367 int i_deblocking_filter_alphac0; /* [-6, 6] -6 light filter, 6 strong */ 368 int i_deblocking_filter_beta; /* [-6, 6] idem */ 369 370 int b_cabac; 371 int i_cabac_init_idc; 372 373 int b_interlaced; 374 int b_constrained_intra; 375 376 int i_cqm_preset; 377 char *psz_cqm_file; /* filename (in UTF-8) of CQM file, JM format */ 378 uint8_t cqm_4iy[16]; /* used only if i_cqm_preset == X264_CQM_CUSTOM */ 379 uint8_t cqm_4py[16]; 380 uint8_t cqm_4ic[16]; 381 uint8_t cqm_4pc[16]; 382 uint8_t cqm_8iy[64]; 383 uint8_t cqm_8py[64]; 384 uint8_t cqm_8ic[64]; 385 uint8_t cqm_8pc[64]; 386 387 /* Log */ 388 void (*pf_log)( void *, int i_level, const char *psz, va_list ); 389 void *p_log_private; 390 int i_log_level; 391 int b_full_recon; /* fully reconstruct frames, even when not necessary for encoding. Implied by psz_dump_yuv */ 392 char *psz_dump_yuv; /* filename (in UTF-8) for reconstructed frames */ 393 394 /* Encoder analyser parameters */ 395 struct 396 { 397 unsigned int intra; /* intra partitions */ 398 unsigned int inter; /* inter partitions */ 399 400 int b_transform_8x8; 401 int i_weighted_pred; /* weighting for P-frames */ 402 int b_weighted_bipred; /* implicit weighting for B-frames */ 403 int i_direct_mv_pred; /* spatial vs temporal mv prediction */ 404 int i_chroma_qp_offset; 405 406 int i_me_method; /* motion estimation algorithm to use (X264_ME_*) */ 407 int i_me_range; /* integer pixel motion estimation search range (from predicted mv) */ 408 int i_mv_range; /* maximum length of a mv (in pixels). -1 = auto, based on level */ 409 int i_mv_range_thread; /* minimum space between threads. -1 = auto, based on number of threads. */ 410 int i_subpel_refine; /* subpixel motion estimation quality */ 411 int b_chroma_me; /* chroma ME for subpel and mode decision in P-frames */ 412 int b_mixed_references; /* allow each mb partition to have its own reference number */ 413 int i_trellis; /* trellis RD quantization */ 414 int b_fast_pskip; /* early SKIP detection on P-frames */ 415 int b_dct_decimate; /* transform coefficient thresholding on P-frames */ 416 int i_noise_reduction; /* adaptive pseudo-deadzone */ 417 float f_psy_rd; /* Psy RD strength */ 418 float f_psy_trellis; /* Psy trellis strength */ 419 int b_psy; /* Toggle all psy optimizations */ 420 421 int b_mb_info; /* Use input mb_info data in x264_picture_t */ 422 int b_mb_info_update; /* Update the values in mb_info according to the results of encoding. */ 423 424 /* the deadzone size that will be used in luma quantization */ 425 int i_luma_deadzone[2]; /* {inter, intra} */ 426 427 int b_psnr; /* compute and print PSNR stats */ 428 int b_ssim; /* compute and print SSIM stats */ 429 } analyse; 430 431 /* Rate control parameters */ 432 struct 433 { 434 int i_rc_method; /* X264_RC_* */ 435 436 int i_qp_constant; /* 0=lossless */ 437 int i_qp_min; /* min allowed QP value */ 438 int i_qp_max; /* max allowed QP value */ 439 int i_qp_step; /* max QP step between frames */ 440 441 int i_bitrate; 442 float f_rf_constant; /* 1pass VBR, nominal QP */ 443 float f_rf_constant_max; /* In CRF mode, maximum CRF as caused by VBV */ 444 float f_rate_tolerance; 445 int i_vbv_max_bitrate; 446 int i_vbv_buffer_size; 447 float f_vbv_buffer_init; /* <=1: fraction of buffer_size. >1: kbit */ 448 float f_ip_factor; 449 float f_pb_factor; 450 451 /* VBV filler: force CBR VBV and use filler bytes to ensure hard-CBR. 452 * Implied by NAL-HRD CBR. */ 453 int b_filler; 454 455 int i_aq_mode; /* psy adaptive QP. (X264_AQ_*) */ 456 float f_aq_strength; 457 int b_mb_tree; /* Macroblock-tree ratecontrol. */ 458 int i_lookahead; 459 460 /* 2pass */ 461 int b_stat_write; /* Enable stat writing in psz_stat_out */ 462 char *psz_stat_out; /* output filename (in UTF-8) of the 2pass stats file */ 463 int b_stat_read; /* Read stat from psz_stat_in and use it */ 464 char *psz_stat_in; /* input filename (in UTF-8) of the 2pass stats file */ 465 466 /* 2pass params (same as ffmpeg ones) */ 467 float f_qcompress; /* 0.0 => cbr, 1.0 => constant qp */ 468 float f_qblur; /* temporally blur quants */ 469 float f_complexity_blur; /* temporally blur complexity */ 470 x264_zone_t *zones; /* ratecontrol overrides */ 471 int i_zones; /* number of zone_t's */ 472 char *psz_zones; /* alternate method of specifying zones */ 473 } rc; 474 475 /* Cropping Rectangle parameters: added to those implicitly defined by 476 non-mod16 video resolutions. */ 477 struct 478 { 479 int i_left; 480 int i_top; 481 int i_right; 482 int i_bottom; 483 } crop_rect; 484 485 /* frame packing arrangement flag */ 486 int i_frame_packing; 487 488 /* mastering display SEI: Primary and white point chromaticity coordinates 489 in 0.00002 increments. Brightness units are 0.0001 cd/m^2. */ 490 struct 491 { 492 int b_mastering_display; /* enable writing this SEI */ 493 int i_green_x; 494 int i_green_y; 495 int i_blue_x; 496 int i_blue_y; 497 int i_red_x; 498 int i_red_y; 499 int i_white_x; 500 int i_white_y; 501 int64_t i_display_max; 502 int64_t i_display_min; 503 } mastering_display; 504 505 /* content light level SEI */ 506 struct 507 { 508 int b_cll; /* enable writing this SEI */ 509 int i_max_cll; 510 int i_max_fall; 511 } content_light_level; 512 513 /* alternative transfer SEI */ 514 int i_alternative_transfer; 515 516 /* Muxing parameters */ 517 int b_aud; /* generate access unit delimiters */ 518 int b_repeat_headers; /* put SPS/PPS before each keyframe */ 519 int b_annexb; /* if set, place start codes (4 bytes) before NAL units, 520 * otherwise place size (4 bytes) before NAL units. */ 521 int i_sps_id; /* SPS and PPS id number */ 522 int b_vfr_input; /* VFR input. If 1, use timebase and timestamps for ratecontrol purposes. 523 * If 0, use fps only. */ 524 int b_pulldown; /* use explicity set timebase for CFR */ 525 uint32_t i_fps_num; 526 uint32_t i_fps_den; 527 uint32_t i_timebase_num; /* Timebase numerator */ 528 uint32_t i_timebase_den; /* Timebase denominator */ 529 530 int b_tff; 531 532 /* Pulldown: 533 * The correct pic_struct must be passed with each input frame. 534 * The input timebase should be the timebase corresponding to the output framerate. This should be constant. 535 * e.g. for 3:2 pulldown timebase should be 1001/30000 536 * The PTS passed with each frame must be the PTS of the frame after pulldown is applied. 537 * Frame doubling and tripling require b_vfr_input set to zero (see H.264 Table D-1) 538 * 539 * Pulldown changes are not clearly defined in H.264. Therefore, it is the calling app's responsibility to manage this. 540 */ 541 542 int b_pic_struct; 543 544 /* Fake Interlaced. 545 * 546 * Used only when b_interlaced=0. Setting this flag makes it possible to flag the stream as PAFF interlaced yet 547 * encode all frames progessively. It is useful for encoding 25p and 30p Blu-Ray streams. 548 */ 549 550 int b_fake_interlaced; 551 552 /* Don't optimize header parameters based on video content, e.g. ensure that splitting an input video, compressing 553 * each part, and stitching them back together will result in identical SPS/PPS. This is necessary for stitching 554 * with container formats that don't allow multiple SPS/PPS. */ 555 int b_stitchable; 556 557 int b_opencl; /* use OpenCL when available */ 558 int i_opencl_device; /* specify count of GPU devices to skip, for CLI users */ 559 void *opencl_device_id; /* pass explicit cl_device_id as void*, for API users */ 560 char *psz_clbin_file; /* filename (in UTF-8) of the compiled OpenCL kernel cache file */ 561 562 /* Slicing parameters */ 563 int i_slice_max_size; /* Max size per slice in bytes; includes estimated NAL overhead. */ 564 int i_slice_max_mbs; /* Max number of MBs per slice; overrides i_slice_count. */ 565 int i_slice_min_mbs; /* Min number of MBs per slice */ 566 int i_slice_count; /* Number of slices per frame: forces rectangular slices. */ 567 int i_slice_count_max; /* Absolute cap on slices per frame; stops applying slice-max-size 568 * and slice-max-mbs if this is reached. */ 569 570 /* Optional callback for freeing this x264_param_t when it is done being used. 571 * Only used when the x264_param_t sits in memory for an indefinite period of time, 572 * i.e. when an x264_param_t is passed to x264_t in an x264_picture_t or in zones. 573 * Not used when x264_encoder_reconfig is called directly. */ 574 void (*param_free)( void* ); 575 576 /* Optional low-level callback for low-latency encoding. Called for each output NAL unit 577 * immediately after the NAL unit is finished encoding. This allows the calling application 578 * to begin processing video data (e.g. by sending packets over a network) before the frame 579 * is done encoding. 580 * 581 * This callback MUST do the following in order to work correctly: 582 * 1) Have available an output buffer of at least size nal->i_payload*3/2 + 5 + 64. 583 * 2) Call x264_nal_encode( h, dst, nal ), where dst is the output buffer. 584 * After these steps, the content of nal is valid and can be used in the same way as if 585 * the NAL unit were output by x264_encoder_encode. 586 * 587 * This does not need to be synchronous with the encoding process: the data pointed to 588 * by nal (both before and after x264_nal_encode) will remain valid until the next 589 * x264_encoder_encode call. The callback must be re-entrant. 590 * 591 * This callback does not work with frame-based threads; threads must be disabled 592 * or sliced-threads enabled. This callback also does not work as one would expect 593 * with HRD -- since the buffering period SEI cannot be calculated until the frame 594 * is finished encoding, it will not be sent via this callback. 595 * 596 * Note also that the NALs are not necessarily returned in order when sliced threads is 597 * enabled. Accordingly, the variable i_first_mb and i_last_mb are available in 598 * x264_nal_t to help the calling application reorder the slices if necessary. 599 * 600 * When this callback is enabled, x264_encoder_encode does not return valid NALs; 601 * the calling application is expected to acquire all output NALs through the callback. 602 * 603 * It is generally sensible to combine this callback with a use of slice-max-mbs or 604 * slice-max-size. 605 * 606 * The opaque pointer is the opaque pointer from the input frame associated with this 607 * NAL unit. This helps distinguish between nalu_process calls from different sources, 608 * e.g. if doing multiple encodes in one process. 609 */ 610 void (*nalu_process)( x264_t *h, x264_nal_t *nal, void *opaque ); 611 612 /* For internal use only */ 613 void *opaque; 614 } x264_param_t; 615 616 X264_API void x264_nal_encode( x264_t *h, uint8_t *dst, x264_nal_t *nal ); 617 618 /**************************************************************************** 619 * H.264 level restriction information 620 ****************************************************************************/ 621 622 typedef struct x264_level_t 623 { 624 uint8_t level_idc; 625 int32_t mbps; /* max macroblock processing rate (macroblocks/sec) */ 626 int32_t frame_size; /* max frame size (macroblocks) */ 627 int32_t dpb; /* max decoded picture buffer (mbs) */ 628 int32_t bitrate; /* max bitrate (kbit/sec) */ 629 int32_t cpb; /* max vbv buffer (kbit) */ 630 uint16_t mv_range; /* max vertical mv component range (pixels) */ 631 uint8_t mvs_per_2mb; /* max mvs per 2 consecutive mbs. */ 632 uint8_t slice_rate; /* ?? */ 633 uint8_t mincr; /* min compression ratio */ 634 uint8_t bipred8x8; /* limit bipred to >=8x8 */ 635 uint8_t direct8x8; /* limit b_direct to >=8x8 */ 636 uint8_t frame_only; /* forbid interlacing */ 637 } x264_level_t; 638 639 /* all of the levels defined in the standard, terminated by .level_idc=0 */ 640 X264_API extern const x264_level_t x264_levels[]; 641 642 /**************************************************************************** 643 * Basic parameter handling functions 644 ****************************************************************************/ 645 646 /* x264_param_default: 647 * fill x264_param_t with default values and do CPU detection */ 648 X264_API void x264_param_default( x264_param_t * ); 649 650 /* x264_param_parse: 651 * set one parameter by name. 652 * returns 0 on success, or returns one of the following errors. 653 * note: BAD_VALUE occurs only if it can't even parse the value, 654 * numerical range is not checked until x264_encoder_open() or 655 * x264_encoder_reconfig(). 656 * value=NULL means "true" for boolean options, but is a BAD_VALUE for non-booleans. 657 * can allocate memory which should be freed by call of x264_param_cleanup. */ 658 #define X264_PARAM_BAD_NAME (-1) 659 #define X264_PARAM_BAD_VALUE (-2) 660 #define X264_PARAM_ALLOC_FAILED (-3) 661 X264_API int x264_param_parse( x264_param_t *, const char *name, const char *value ); 662 663 /* x264_param_cleanup: 664 * Cleans up and frees allocated members of x264_param_t. 665 * This *does not* free the x264_param_t itself, as it may exist on the 666 * stack. It only frees any members of the struct that were allocated by 667 * x264 itself, in e.g. x264_param_parse(). */ 668 X264_API void x264_param_cleanup( x264_param_t *param ); 669 670 /**************************************************************************** 671 * Advanced parameter handling functions 672 ****************************************************************************/ 673 674 /* These functions expose the full power of x264's preset-tune-profile system for 675 * easy adjustment of large numbers of internal parameters. 676 * 677 * In order to replicate x264CLI's option handling, these functions MUST be called 678 * in the following order: 679 * 1) x264_param_default_preset 680 * 2) Custom user options (via param_parse or directly assigned variables) 681 * 3) x264_param_apply_fastfirstpass 682 * 4) x264_param_apply_profile 683 * 684 * Additionally, x264CLI does not apply step 3 if the preset chosen is "placebo" 685 * or --slow-firstpass is set. */ 686 687 /* x264_param_default_preset: 688 * The same as x264_param_default, but also use the passed preset and tune 689 * to modify the default settings. 690 * (either can be NULL, which implies no preset or no tune, respectively) 691 * 692 * Currently available presets are, ordered from fastest to slowest: */ 693 static const char * const x264_preset_names[] = { "ultrafast", "superfast", "veryfast", "faster", "fast", "medium", "slow", "slower", "veryslow", "placebo", 0 }; 694 695 /* The presets can also be indexed numerically, as in: 696 * x264_param_default_preset( ¶m, "3", ... ) 697 * with ultrafast mapping to "0" and placebo mapping to "9". This mapping may 698 * of course change if new presets are added in between, but will always be 699 * ordered from fastest to slowest. 700 * 701 * Warning: the speed of these presets scales dramatically. Ultrafast is a full 702 * 100 times faster than placebo! 703 * 704 * Currently available tunings are: */ 705 static const char * const x264_tune_names[] = { "film", "animation", "grain", "stillimage", "psnr", "ssim", "fastdecode", "zerolatency", 0 }; 706 707 /* Multiple tunings can be used if separated by a delimiter in ",./-+", 708 * however multiple psy tunings cannot be used. 709 * film, animation, grain, stillimage, psnr, and ssim are psy tunings. 710 * 711 * returns 0 on success, negative on failure (e.g. invalid preset/tune name). */ 712 X264_API int x264_param_default_preset( x264_param_t *, const char *preset, const char *tune ); 713 714 /* x264_param_apply_fastfirstpass: 715 * If first-pass mode is set (rc.b_stat_read == 0, rc.b_stat_write == 1), 716 * modify the encoder settings to disable options generally not useful on 717 * the first pass. */ 718 X264_API void x264_param_apply_fastfirstpass( x264_param_t * ); 719 720 /* x264_param_apply_profile: 721 * Applies the restrictions of the given profile. 722 * Currently available profiles are, from most to least restrictive: */ 723 static const char * const x264_profile_names[] = { "baseline", "main", "high", "high10", "high422", "high444", 0 }; 724 725 /* (can be NULL, in which case the function will do nothing) 726 * 727 * Does NOT guarantee that the given profile will be used: if the restrictions 728 * of "High" are applied to settings that are already Baseline-compatible, the 729 * stream will remain baseline. In short, it does not increase settings, only 730 * decrease them. 731 * 732 * returns 0 on success, negative on failure (e.g. invalid profile name). */ 733 X264_API int x264_param_apply_profile( x264_param_t *, const char *profile ); 734 735 /**************************************************************************** 736 * Picture structures and functions 737 ****************************************************************************/ 738 739 /* x264_chroma_format: 740 * Specifies the chroma formats that x264 supports encoding. When this 741 * value is non-zero, then it represents a X264_CSP_* that is the only 742 * chroma format that x264 supports encoding. If the value is 0 then 743 * there are no restrictions. */ 744 X264_API extern const int x264_chroma_format; 745 746 enum pic_struct_e 747 { 748 PIC_STRUCT_AUTO = 0, // automatically decide (default) 749 PIC_STRUCT_PROGRESSIVE = 1, // progressive frame 750 // "TOP" and "BOTTOM" are not supported in x264 (PAFF only) 751 PIC_STRUCT_TOP_BOTTOM = 4, // top field followed by bottom 752 PIC_STRUCT_BOTTOM_TOP = 5, // bottom field followed by top 753 PIC_STRUCT_TOP_BOTTOM_TOP = 6, // top field, bottom field, top field repeated 754 PIC_STRUCT_BOTTOM_TOP_BOTTOM = 7, // bottom field, top field, bottom field repeated 755 PIC_STRUCT_DOUBLE = 8, // double frame 756 PIC_STRUCT_TRIPLE = 9, // triple frame 757 }; 758 759 typedef struct x264_hrd_t 760 { 761 double cpb_initial_arrival_time; 762 double cpb_final_arrival_time; 763 double cpb_removal_time; 764 765 double dpb_output_time; 766 } x264_hrd_t; 767 768 /* Arbitrary user SEI: 769 * Payload size is in bytes and the payload pointer must be valid. 770 * Payload types and syntax can be found in Annex D of the H.264 Specification. 771 * SEI payload alignment bits as described in Annex D must be included at the 772 * end of the payload if needed. 773 * The payload should not be NAL-encapsulated. 774 * Payloads are written first in order of input, apart from in the case when HRD 775 * is enabled where payloads are written after the Buffering Period SEI. */ 776 777 typedef struct x264_sei_payload_t 778 { 779 int payload_size; 780 int payload_type; 781 uint8_t *payload; 782 } x264_sei_payload_t; 783 784 typedef struct x264_sei_t 785 { 786 int num_payloads; 787 x264_sei_payload_t *payloads; 788 /* In: optional callback to free each payload AND x264_sei_payload_t when used. */ 789 void (*sei_free)( void* ); 790 } x264_sei_t; 791 792 typedef struct x264_image_t 793 { 794 int i_csp; /* Colorspace */ 795 int i_plane; /* Number of image planes */ 796 int i_stride[4]; /* Strides for each plane */ 797 uint8_t *plane[4]; /* Pointers to each plane */ 798 } x264_image_t; 799 800 typedef struct x264_image_properties_t 801 { 802 /* All arrays of data here are ordered as follows: 803 * each array contains one offset per macroblock, in raster scan order. In interlaced 804 * mode, top-field MBs and bottom-field MBs are interleaved at the row level. 805 * Macroblocks are 16x16 blocks of pixels (with respect to the luma plane). For the 806 * purposes of calculating the number of macroblocks, width and height are rounded up to 807 * the nearest 16. If in interlaced mode, height is rounded up to the nearest 32 instead. */ 808 809 /* In: an array of quantizer offsets to be applied to this image during encoding. 810 * These are added on top of the decisions made by x264. 811 * Offsets can be fractional; they are added before QPs are rounded to integer. 812 * Adaptive quantization must be enabled to use this feature. Behavior if quant 813 * offsets differ between encoding passes is undefined. */ 814 float *quant_offsets; 815 /* In: optional callback to free quant_offsets when used. 816 * Useful if one wants to use a different quant_offset array for each frame. */ 817 void (*quant_offsets_free)( void* ); 818 819 /* In: optional array of flags for each macroblock. 820 * Allows specifying additional information for the encoder such as which macroblocks 821 * remain unchanged. Usable flags are listed below. 822 * x264_param_t.analyse.b_mb_info must be set to use this, since x264 needs to track 823 * extra data internally to make full use of this information. 824 * 825 * Out: if b_mb_info_update is set, x264 will update this array as a result of encoding. 826 * 827 * For "MBINFO_CONSTANT", it will remove this flag on any macroblock whose decoded 828 * pixels have changed. This can be useful for e.g. noting which areas of the 829 * frame need to actually be blitted. Note: this intentionally ignores the effects 830 * of deblocking for the current frame, which should be fine unless one needs exact 831 * pixel-perfect accuracy. 832 * 833 * Results for MBINFO_CONSTANT are currently only set for P-frames, and are not 834 * guaranteed to enumerate all blocks which haven't changed. (There may be false 835 * negatives, but no false positives.) 836 */ 837 uint8_t *mb_info; 838 /* In: optional callback to free mb_info when used. */ 839 void (*mb_info_free)( void* ); 840 841 /* The macroblock is constant and remains unchanged from the previous frame. */ 842 #define X264_MBINFO_CONSTANT (1U<<0) 843 /* More flags may be added in the future. */ 844 845 /* Out: SSIM of the the frame luma (if x264_param_t.b_ssim is set) */ 846 double f_ssim; 847 /* Out: Average PSNR of the frame (if x264_param_t.b_psnr is set) */ 848 double f_psnr_avg; 849 /* Out: PSNR of Y, U, and V (if x264_param_t.b_psnr is set) */ 850 double f_psnr[3]; 851 852 /* Out: Average effective CRF of the encoded frame */ 853 double f_crf_avg; 854 } x264_image_properties_t; 855 856 typedef struct x264_picture_t 857 { 858 /* In: force picture type (if not auto) 859 * If x264 encoding parameters are violated in the forcing of picture types, 860 * x264 will correct the input picture type and log a warning. 861 * Out: type of the picture encoded */ 862 int i_type; 863 /* In: force quantizer for != X264_QP_AUTO */ 864 int i_qpplus1; 865 /* In: pic_struct, for pulldown/doubling/etc...used only if b_pic_struct=1. 866 * use pic_struct_e for pic_struct inputs 867 * Out: pic_struct element associated with frame */ 868 int i_pic_struct; 869 /* Out: whether this frame is a keyframe. Important when using modes that result in 870 * SEI recovery points being used instead of IDR frames. */ 871 int b_keyframe; 872 /* In: user pts, Out: pts of encoded picture (user)*/ 873 int64_t i_pts; 874 /* Out: frame dts. When the pts of the first frame is close to zero, 875 * initial frames may have a negative dts which must be dealt with by any muxer */ 876 int64_t i_dts; 877 /* In: custom encoding parameters to be set from this frame forwards 878 (in coded order, not display order). If NULL, continue using 879 parameters from the previous frame. Some parameters, such as 880 aspect ratio, can only be changed per-GOP due to the limitations 881 of H.264 itself; in this case, the caller must force an IDR frame 882 if it needs the changed parameter to apply immediately. */ 883 x264_param_t *param; 884 /* In: raw image data */ 885 /* Out: reconstructed image data. x264 may skip part of the reconstruction process, 886 e.g. deblocking, in frames where it isn't necessary. To force complete 887 reconstruction, at a small speed cost, set b_full_recon. */ 888 x264_image_t img; 889 /* In: optional information to modify encoder decisions for this frame 890 * Out: information about the encoded frame */ 891 x264_image_properties_t prop; 892 /* Out: HRD timing information. Output only when i_nal_hrd is set. */ 893 x264_hrd_t hrd_timing; 894 /* In: arbitrary user SEI (e.g subtitles, AFDs) */ 895 x264_sei_t extra_sei; 896 /* private user data. copied from input to output frames. */ 897 void *opaque; 898 } x264_picture_t; 899 900 /* x264_picture_init: 901 * initialize an x264_picture_t. Needs to be done if the calling application 902 * allocates its own x264_picture_t as opposed to using x264_picture_alloc. */ 903 X264_API void x264_picture_init( x264_picture_t *pic ); 904 905 /* x264_picture_alloc: 906 * alloc data for a picture. You must call x264_picture_clean on it. 907 * returns 0 on success, or -1 on malloc failure or invalid colorspace. */ 908 X264_API int x264_picture_alloc( x264_picture_t *pic, int i_csp, int i_width, int i_height ); 909 910 /* x264_picture_clean: 911 * free associated resource for a x264_picture_t allocated with 912 * x264_picture_alloc ONLY */ 913 X264_API void x264_picture_clean( x264_picture_t *pic ); 914 915 /**************************************************************************** 916 * Encoder functions 917 ****************************************************************************/ 918 919 /* Force a link error in the case of linking against an incompatible API version. 920 * Glue #defines exist to force correct macro expansion; the final output of the macro 921 * is x264_encoder_open_##X264_BUILD (for purposes of dlopen). */ 922 #define x264_encoder_glue1(x,y) x##y 923 #define x264_encoder_glue2(x,y) x264_encoder_glue1(x,y) 924 #define x264_encoder_open x264_encoder_glue2(x264_encoder_open_,X264_BUILD) 925 926 /* x264_encoder_open: 927 * create a new encoder handler, all parameters from x264_param_t are copied */ 928 X264_API x264_t *x264_encoder_open( x264_param_t * ); 929 930 /* x264_encoder_reconfig: 931 * various parameters from x264_param_t are copied. 932 * this takes effect immediately, on whichever frame is encoded next; 933 * due to delay, this may not be the next frame passed to encoder_encode. 934 * if the change should apply to some particular frame, use x264_picture_t->param instead. 935 * returns 0 on success, negative on parameter validation error. 936 * not all parameters can be changed; see the actual function for a detailed breakdown. 937 * 938 * since not all parameters can be changed, moving from preset to preset may not always 939 * fully copy all relevant parameters, but should still work usably in practice. however, 940 * more so than for other presets, many of the speed shortcuts used in ultrafast cannot be 941 * switched out of; using reconfig to switch between ultrafast and other presets is not 942 * recommended without a more fine-grained breakdown of parameters to take this into account. */ 943 X264_API int x264_encoder_reconfig( x264_t *, x264_param_t * ); 944 /* x264_encoder_parameters: 945 * copies the current internal set of parameters to the pointer provided 946 * by the caller. useful when the calling application needs to know 947 * how x264_encoder_open has changed the parameters, or the current state 948 * of the encoder after multiple x264_encoder_reconfig calls. 949 * note that the data accessible through pointers in the returned param struct 950 * (e.g. filenames) should not be modified by the calling application. */ 951 X264_API void x264_encoder_parameters( x264_t *, x264_param_t * ); 952 /* x264_encoder_headers: 953 * return the SPS and PPS that will be used for the whole stream. 954 * *pi_nal is the number of NAL units outputted in pp_nal. 955 * returns the number of bytes in the returned NALs. 956 * returns negative on error. 957 * the payloads of all output NALs are guaranteed to be sequential in memory. */ 958 X264_API int x264_encoder_headers( x264_t *, x264_nal_t **pp_nal, int *pi_nal ); 959 /* x264_encoder_encode: 960 * encode one picture. 961 * *pi_nal is the number of NAL units outputted in pp_nal. 962 * returns the number of bytes in the returned NALs. 963 * returns negative on error and zero if no NAL units returned. 964 * the payloads of all output NALs are guaranteed to be sequential in memory. */ 965 X264_API int x264_encoder_encode( x264_t *, x264_nal_t **pp_nal, int *pi_nal, x264_picture_t *pic_in, x264_picture_t *pic_out ); 966 /* x264_encoder_close: 967 * close an encoder handler */ 968 X264_API void x264_encoder_close( x264_t * ); 969 /* x264_encoder_delayed_frames: 970 * return the number of currently delayed (buffered) frames 971 * this should be used at the end of the stream, to know when you have all the encoded frames. */ 972 X264_API int x264_encoder_delayed_frames( x264_t * ); 973 /* x264_encoder_maximum_delayed_frames( x264_t * ): 974 * return the maximum number of delayed (buffered) frames that can occur with the current 975 * parameters. */ 976 X264_API int x264_encoder_maximum_delayed_frames( x264_t * ); 977 /* x264_encoder_intra_refresh: 978 * If an intra refresh is not in progress, begin one with the next P-frame. 979 * If an intra refresh is in progress, begin one as soon as the current one finishes. 980 * Requires that b_intra_refresh be set. 981 * 982 * Useful for interactive streaming where the client can tell the server that packet loss has 983 * occurred. In this case, keyint can be set to an extremely high value so that intra refreshes 984 * only occur when calling x264_encoder_intra_refresh. 985 * 986 * In multi-pass encoding, if x264_encoder_intra_refresh is called differently in each pass, 987 * behavior is undefined. 988 * 989 * Should not be called during an x264_encoder_encode. */ 990 X264_API void x264_encoder_intra_refresh( x264_t * ); 991 /* x264_encoder_invalidate_reference: 992 * An interactive error resilience tool, designed for use in a low-latency one-encoder-few-clients 993 * system. When the client has packet loss or otherwise incorrectly decodes a frame, the encoder 994 * can be told with this command to "forget" the frame and all frames that depend on it, referencing 995 * only frames that occurred before the loss. This will force a keyframe if no frames are left to 996 * reference after the aforementioned "forgetting". 997 * 998 * It is strongly recommended to use a large i_dpb_size in this case, which allows the encoder to 999 * keep around extra, older frames to fall back on in case more recent frames are all invalidated. 1000 * Unlike increasing i_frame_reference, this does not increase the number of frames used for motion 1001 * estimation and thus has no speed impact. It is also recommended to set a very large keyframe 1002 * interval, so that keyframes are not used except as necessary for error recovery. 1003 * 1004 * x264_encoder_invalidate_reference is not currently compatible with the use of B-frames or intra 1005 * refresh. 1006 * 1007 * In multi-pass encoding, if x264_encoder_invalidate_reference is called differently in each pass, 1008 * behavior is undefined. 1009 * 1010 * Should not be called during an x264_encoder_encode, but multiple calls can be made simultaneously. 1011 * 1012 * Returns 0 on success, negative on failure. */ 1013 X264_API int x264_encoder_invalidate_reference( x264_t *, int64_t pts ); 1014 1015 #ifdef __cplusplus 1016 } 1017 #endif 1018 1019 #endif 1020