1 /*
2 * FLV demuxer
3 * Copyright (c) 2003 The FFmpeg Project
4 *
5 * This demuxer will generate a 1 byte extradata for VP6F content.
6 * It is composed of:
7 * - upper 4 bits: difference between encoded width and visible width
8 * - lower 4 bits: difference between encoded height and visible height
9 *
10 * This file is part of FFmpeg.
11 *
12 * FFmpeg is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU Lesser General Public
14 * License as published by the Free Software Foundation; either
15 * version 2.1 of the License, or (at your option) any later version.
16 *
17 * FFmpeg is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 * Lesser General Public License for more details.
21 *
22 * You should have received a copy of the GNU Lesser General Public
23 * License along with FFmpeg; if not, write to the Free Software
24 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
25 */
26
27 #include "libavutil/avstring.h"
28 #include "libavutil/channel_layout.h"
29 #include "libavutil/dict.h"
30 #include "libavutil/opt.h"
31 #include "libavutil/intfloat.h"
32 #include "libavutil/mathematics.h"
33 #include "libavcodec/bytestream.h"
34 #include "libavcodec/mpeg4audio.h"
35 #include "avformat.h"
36 #include "internal.h"
37 #include "avio_internal.h"
38 #include "flv.h"
39
40 #define VALIDATE_INDEX_TS_THRESH 2500
41
42 #define RESYNC_BUFFER_SIZE (1<<20)
43
44 typedef struct FLVContext {
45 const AVClass *class; ///< Class for private options.
46 int trust_metadata; ///< configure streams according onMetaData
47 int trust_datasize; ///< trust data size of FLVTag
48 int dump_full_metadata; ///< Dump full metadata of the onMetadata
49 int wrong_dts; ///< wrong dts due to negative cts
50 uint8_t *new_extradata[FLV_STREAM_TYPE_NB];
51 int new_extradata_size[FLV_STREAM_TYPE_NB];
52 int last_sample_rate;
53 int last_channels;
54 struct {
55 int64_t dts;
56 int64_t pos;
57 } validate_index[2];
58 int validate_next;
59 int validate_count;
60 int searched_for_end;
61
62 uint8_t resync_buffer[2*RESYNC_BUFFER_SIZE];
63
64 int broken_sizes;
65 int sum_flv_tag_size;
66
67 int last_keyframe_stream_index;
68 int keyframe_count;
69 int64_t video_bit_rate;
70 int64_t audio_bit_rate;
71 int64_t *keyframe_times;
72 int64_t *keyframe_filepositions;
73 int missing_streams;
74 AVRational framerate;
75 } FLVContext;
76
probe(AVProbeData * p,int live)77 static int probe(AVProbeData *p, int live)
78 {
79 const uint8_t *d = p->buf;
80 unsigned offset = AV_RB32(d + 5);
81
82 if (d[0] == 'F' &&
83 d[1] == 'L' &&
84 d[2] == 'V' &&
85 d[3] < 5 && d[5] == 0 &&
86 offset + 100 < p->buf_size &&
87 offset > 8) {
88 int is_live = !memcmp(d + offset + 40, "NGINX RTMP", 10);
89
90 if (live == is_live)
91 return AVPROBE_SCORE_MAX;
92 }
93 return 0;
94 }
95
flv_probe(AVProbeData * p)96 static int flv_probe(AVProbeData *p)
97 {
98 return probe(p, 0);
99 }
100
live_flv_probe(AVProbeData * p)101 static int live_flv_probe(AVProbeData *p)
102 {
103 return probe(p, 1);
104 }
105
add_keyframes_index(AVFormatContext * s)106 static void add_keyframes_index(AVFormatContext *s)
107 {
108 FLVContext *flv = s->priv_data;
109 AVStream *stream = NULL;
110 unsigned int i = 0;
111
112 if (flv->last_keyframe_stream_index < 0) {
113 av_log(s, AV_LOG_DEBUG, "keyframe stream hasn't been created\n");
114 return;
115 }
116
117 av_assert0(flv->last_keyframe_stream_index <= s->nb_streams);
118 stream = s->streams[flv->last_keyframe_stream_index];
119
120 if (stream->nb_index_entries == 0) {
121 for (i = 0; i < flv->keyframe_count; i++) {
122 av_log(s, AV_LOG_TRACE, "keyframe filepositions = %"PRId64" times = %"PRId64"\n",
123 flv->keyframe_filepositions[i], flv->keyframe_times[i] * 1000);
124 av_add_index_entry(stream, flv->keyframe_filepositions[i],
125 flv->keyframe_times[i] * 1000, 0, 0, AVINDEX_KEYFRAME);
126 }
127 } else
128 av_log(s, AV_LOG_WARNING, "Skipping duplicate index\n");
129
130 if (stream->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
131 av_freep(&flv->keyframe_times);
132 av_freep(&flv->keyframe_filepositions);
133 flv->keyframe_count = 0;
134 }
135 }
136
create_stream(AVFormatContext * s,int codec_type)137 static AVStream *create_stream(AVFormatContext *s, int codec_type)
138 {
139 FLVContext *flv = s->priv_data;
140 AVStream *st = avformat_new_stream(s, NULL);
141 if (!st)
142 return NULL;
143 st->codecpar->codec_type = codec_type;
144 if (s->nb_streams>=3 ||( s->nb_streams==2
145 && s->streams[0]->codecpar->codec_type != AVMEDIA_TYPE_SUBTITLE
146 && s->streams[1]->codecpar->codec_type != AVMEDIA_TYPE_SUBTITLE))
147 s->ctx_flags &= ~AVFMTCTX_NOHEADER;
148 if (codec_type == AVMEDIA_TYPE_AUDIO) {
149 st->codecpar->bit_rate = flv->audio_bit_rate;
150 flv->missing_streams &= ~FLV_HEADER_FLAG_HASAUDIO;
151 }
152 if (codec_type == AVMEDIA_TYPE_VIDEO) {
153 st->codecpar->bit_rate = flv->video_bit_rate;
154 flv->missing_streams &= ~FLV_HEADER_FLAG_HASVIDEO;
155 st->avg_frame_rate = flv->framerate;
156 }
157
158
159 avpriv_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
160 flv->last_keyframe_stream_index = s->nb_streams - 1;
161 add_keyframes_index(s);
162 return st;
163 }
164
flv_same_audio_codec(AVCodecParameters * apar,int flags)165 static int flv_same_audio_codec(AVCodecParameters *apar, int flags)
166 {
167 int bits_per_coded_sample = (flags & FLV_AUDIO_SAMPLESIZE_MASK) ? 16 : 8;
168 int flv_codecid = flags & FLV_AUDIO_CODECID_MASK;
169 int codec_id;
170
171 if (!apar->codec_id && !apar->codec_tag)
172 return 1;
173
174 if (apar->bits_per_coded_sample != bits_per_coded_sample)
175 return 0;
176
177 switch (flv_codecid) {
178 // no distinction between S16 and S8 PCM codec flags
179 case FLV_CODECID_PCM:
180 codec_id = bits_per_coded_sample == 8
181 ? AV_CODEC_ID_PCM_U8
182 #if HAVE_BIGENDIAN
183 : AV_CODEC_ID_PCM_S16BE;
184 #else
185 : AV_CODEC_ID_PCM_S16LE;
186 #endif
187 return codec_id == apar->codec_id;
188 case FLV_CODECID_PCM_LE:
189 codec_id = bits_per_coded_sample == 8
190 ? AV_CODEC_ID_PCM_U8
191 : AV_CODEC_ID_PCM_S16LE;
192 return codec_id == apar->codec_id;
193 case FLV_CODECID_AAC:
194 return apar->codec_id == AV_CODEC_ID_AAC;
195 case FLV_CODECID_ADPCM:
196 return apar->codec_id == AV_CODEC_ID_ADPCM_SWF;
197 case FLV_CODECID_SPEEX:
198 return apar->codec_id == AV_CODEC_ID_SPEEX;
199 case FLV_CODECID_MP3:
200 return apar->codec_id == AV_CODEC_ID_MP3;
201 case FLV_CODECID_NELLYMOSER_8KHZ_MONO:
202 case FLV_CODECID_NELLYMOSER_16KHZ_MONO:
203 case FLV_CODECID_NELLYMOSER:
204 return apar->codec_id == AV_CODEC_ID_NELLYMOSER;
205 case FLV_CODECID_PCM_MULAW:
206 return apar->sample_rate == 8000 &&
207 apar->codec_id == AV_CODEC_ID_PCM_MULAW;
208 case FLV_CODECID_PCM_ALAW:
209 return apar->sample_rate == 8000 &&
210 apar->codec_id == AV_CODEC_ID_PCM_ALAW;
211 default:
212 return apar->codec_tag == (flv_codecid >> FLV_AUDIO_CODECID_OFFSET);
213 }
214 }
215
flv_set_audio_codec(AVFormatContext * s,AVStream * astream,AVCodecParameters * apar,int flv_codecid)216 static void flv_set_audio_codec(AVFormatContext *s, AVStream *astream,
217 AVCodecParameters *apar, int flv_codecid)
218 {
219 switch (flv_codecid) {
220 // no distinction between S16 and S8 PCM codec flags
221 case FLV_CODECID_PCM:
222 apar->codec_id = apar->bits_per_coded_sample == 8
223 ? AV_CODEC_ID_PCM_U8
224 #if HAVE_BIGENDIAN
225 : AV_CODEC_ID_PCM_S16BE;
226 #else
227 : AV_CODEC_ID_PCM_S16LE;
228 #endif
229 break;
230 case FLV_CODECID_PCM_LE:
231 apar->codec_id = apar->bits_per_coded_sample == 8
232 ? AV_CODEC_ID_PCM_U8
233 : AV_CODEC_ID_PCM_S16LE;
234 break;
235 case FLV_CODECID_AAC:
236 apar->codec_id = AV_CODEC_ID_AAC;
237 break;
238 case FLV_CODECID_ADPCM:
239 apar->codec_id = AV_CODEC_ID_ADPCM_SWF;
240 break;
241 case FLV_CODECID_SPEEX:
242 apar->codec_id = AV_CODEC_ID_SPEEX;
243 apar->sample_rate = 16000;
244 break;
245 case FLV_CODECID_MP3:
246 apar->codec_id = AV_CODEC_ID_MP3;
247 astream->need_parsing = AVSTREAM_PARSE_FULL;
248 break;
249 case FLV_CODECID_NELLYMOSER_8KHZ_MONO:
250 // in case metadata does not otherwise declare samplerate
251 apar->sample_rate = 8000;
252 apar->codec_id = AV_CODEC_ID_NELLYMOSER;
253 break;
254 case FLV_CODECID_NELLYMOSER_16KHZ_MONO:
255 apar->sample_rate = 16000;
256 apar->codec_id = AV_CODEC_ID_NELLYMOSER;
257 break;
258 case FLV_CODECID_NELLYMOSER:
259 apar->codec_id = AV_CODEC_ID_NELLYMOSER;
260 break;
261 case FLV_CODECID_PCM_MULAW:
262 apar->sample_rate = 8000;
263 apar->codec_id = AV_CODEC_ID_PCM_MULAW;
264 break;
265 case FLV_CODECID_PCM_ALAW:
266 apar->sample_rate = 8000;
267 apar->codec_id = AV_CODEC_ID_PCM_ALAW;
268 break;
269 default:
270 avpriv_request_sample(s, "Audio codec (%x)",
271 flv_codecid >> FLV_AUDIO_CODECID_OFFSET);
272 apar->codec_tag = flv_codecid >> FLV_AUDIO_CODECID_OFFSET;
273 }
274 }
275
flv_same_video_codec(AVCodecParameters * vpar,int flags)276 static int flv_same_video_codec(AVCodecParameters *vpar, int flags)
277 {
278 int flv_codecid = flags & FLV_VIDEO_CODECID_MASK;
279
280 if (!vpar->codec_id && !vpar->codec_tag)
281 return 1;
282
283 switch (flv_codecid) {
284 case FLV_CODECID_H263:
285 return vpar->codec_id == AV_CODEC_ID_FLV1;
286 case FLV_CODECID_SCREEN:
287 return vpar->codec_id == AV_CODEC_ID_FLASHSV;
288 case FLV_CODECID_SCREEN2:
289 return vpar->codec_id == AV_CODEC_ID_FLASHSV2;
290 case FLV_CODECID_VP6:
291 return vpar->codec_id == AV_CODEC_ID_VP6F;
292 case FLV_CODECID_VP6A:
293 return vpar->codec_id == AV_CODEC_ID_VP6A;
294 case FLV_CODECID_H264:
295 return vpar->codec_id == AV_CODEC_ID_H264;
296 default:
297 return vpar->codec_tag == flv_codecid;
298 }
299 }
300
flv_set_video_codec(AVFormatContext * s,AVStream * vstream,int flv_codecid,int read)301 static int flv_set_video_codec(AVFormatContext *s, AVStream *vstream,
302 int flv_codecid, int read)
303 {
304 int ret = 0;
305 AVCodecParameters *par = vstream->codecpar;
306 enum AVCodecID old_codec_id = vstream->codecpar->codec_id;
307 switch (flv_codecid) {
308 case FLV_CODECID_H263:
309 par->codec_id = AV_CODEC_ID_FLV1;
310 break;
311 case FLV_CODECID_REALH263:
312 par->codec_id = AV_CODEC_ID_H263;
313 break; // Really mean it this time
314 case FLV_CODECID_SCREEN:
315 par->codec_id = AV_CODEC_ID_FLASHSV;
316 break;
317 case FLV_CODECID_SCREEN2:
318 par->codec_id = AV_CODEC_ID_FLASHSV2;
319 break;
320 case FLV_CODECID_VP6:
321 par->codec_id = AV_CODEC_ID_VP6F;
322 case FLV_CODECID_VP6A:
323 if (flv_codecid == FLV_CODECID_VP6A)
324 par->codec_id = AV_CODEC_ID_VP6A;
325 if (read) {
326 if (par->extradata_size != 1) {
327 ff_alloc_extradata(par, 1);
328 }
329 if (par->extradata)
330 par->extradata[0] = avio_r8(s->pb);
331 else
332 avio_skip(s->pb, 1);
333 }
334 ret = 1; // 1 byte body size adjustment for flv_read_packet()
335 break;
336 case FLV_CODECID_H264:
337 par->codec_id = AV_CODEC_ID_H264;
338 vstream->need_parsing = AVSTREAM_PARSE_HEADERS;
339 ret = 3; // not 4, reading packet type will consume one byte
340 break;
341 case FLV_CODECID_MPEG4:
342 par->codec_id = AV_CODEC_ID_MPEG4;
343 ret = 3;
344 break;
345 default:
346 avpriv_request_sample(s, "Video codec (%x)", flv_codecid);
347 par->codec_tag = flv_codecid;
348 }
349
350 if (!vstream->internal->need_context_update && par->codec_id != old_codec_id) {
351 avpriv_request_sample(s, "Changing the codec id midstream");
352 return AVERROR_PATCHWELCOME;
353 }
354
355 return ret;
356 }
357
amf_get_string(AVIOContext * ioc,char * buffer,int buffsize)358 static int amf_get_string(AVIOContext *ioc, char *buffer, int buffsize)
359 {
360 int length = avio_rb16(ioc);
361 if (length >= buffsize) {
362 avio_skip(ioc, length);
363 return -1;
364 }
365
366 avio_read(ioc, buffer, length);
367
368 buffer[length] = '\0';
369
370 return length;
371 }
372
parse_keyframes_index(AVFormatContext * s,AVIOContext * ioc,int64_t max_pos)373 static int parse_keyframes_index(AVFormatContext *s, AVIOContext *ioc, int64_t max_pos)
374 {
375 FLVContext *flv = s->priv_data;
376 unsigned int timeslen = 0, fileposlen = 0, i;
377 char str_val[256];
378 int64_t *times = NULL;
379 int64_t *filepositions = NULL;
380 int ret = AVERROR(ENOSYS);
381 int64_t initial_pos = avio_tell(ioc);
382
383 if (flv->keyframe_count > 0) {
384 av_log(s, AV_LOG_DEBUG, "keyframes have been paresed\n");
385 return 0;
386 }
387 av_assert0(!flv->keyframe_times);
388 av_assert0(!flv->keyframe_filepositions);
389
390 if (s->flags & AVFMT_FLAG_IGNIDX)
391 return 0;
392
393 while (avio_tell(ioc) < max_pos - 2 &&
394 amf_get_string(ioc, str_val, sizeof(str_val)) > 0) {
395 int64_t **current_array;
396 unsigned int arraylen;
397
398 // Expect array object in context
399 if (avio_r8(ioc) != AMF_DATA_TYPE_ARRAY)
400 break;
401
402 arraylen = avio_rb32(ioc);
403 if (arraylen>>28)
404 break;
405
406 if (!strcmp(KEYFRAMES_TIMESTAMP_TAG , str_val) && !times) {
407 current_array = ×
408 timeslen = arraylen;
409 } else if (!strcmp(KEYFRAMES_BYTEOFFSET_TAG, str_val) &&
410 !filepositions) {
411 current_array = &filepositions;
412 fileposlen = arraylen;
413 } else
414 // unexpected metatag inside keyframes, will not use such
415 // metadata for indexing
416 break;
417
418 if (!(*current_array = av_mallocz(sizeof(**current_array) * arraylen))) {
419 ret = AVERROR(ENOMEM);
420 goto finish;
421 }
422
423 for (i = 0; i < arraylen && avio_tell(ioc) < max_pos - 1; i++) {
424 if (avio_r8(ioc) != AMF_DATA_TYPE_NUMBER)
425 goto invalid;
426 current_array[0][i] = av_int2double(avio_rb64(ioc));
427 }
428 if (times && filepositions) {
429 // All done, exiting at a position allowing amf_parse_object
430 // to finish parsing the object
431 ret = 0;
432 break;
433 }
434 }
435
436 if (timeslen == fileposlen && fileposlen>1 && max_pos <= filepositions[0]) {
437 for (i = 0; i < FFMIN(2,fileposlen); i++) {
438 flv->validate_index[i].pos = filepositions[i];
439 flv->validate_index[i].dts = times[i] * 1000;
440 flv->validate_count = i + 1;
441 }
442 flv->keyframe_times = times;
443 flv->keyframe_filepositions = filepositions;
444 flv->keyframe_count = timeslen;
445 times = NULL;
446 filepositions = NULL;
447 } else {
448 invalid:
449 av_log(s, AV_LOG_WARNING, "Invalid keyframes object, skipping.\n");
450 }
451
452 finish:
453 av_freep(×);
454 av_freep(&filepositions);
455 avio_seek(ioc, initial_pos, SEEK_SET);
456 return ret;
457 }
458
amf_parse_object(AVFormatContext * s,AVStream * astream,AVStream * vstream,const char * key,int64_t max_pos,int depth)459 static int amf_parse_object(AVFormatContext *s, AVStream *astream,
460 AVStream *vstream, const char *key,
461 int64_t max_pos, int depth)
462 {
463 AVCodecParameters *apar, *vpar;
464 FLVContext *flv = s->priv_data;
465 AVIOContext *ioc;
466 AMFDataType amf_type;
467 char str_val[1024];
468 double num_val;
469
470 num_val = 0;
471 ioc = s->pb;
472 amf_type = avio_r8(ioc);
473
474 switch (amf_type) {
475 case AMF_DATA_TYPE_NUMBER:
476 num_val = av_int2double(avio_rb64(ioc));
477 break;
478 case AMF_DATA_TYPE_BOOL:
479 num_val = avio_r8(ioc);
480 break;
481 case AMF_DATA_TYPE_STRING:
482 if (amf_get_string(ioc, str_val, sizeof(str_val)) < 0) {
483 av_log(s, AV_LOG_ERROR, "AMF_DATA_TYPE_STRING parsing failed\n");
484 return -1;
485 }
486 break;
487 case AMF_DATA_TYPE_OBJECT:
488 if (key &&
489 (ioc->seekable & AVIO_SEEKABLE_NORMAL) &&
490 !strcmp(KEYFRAMES_TAG, key) && depth == 1)
491 if (parse_keyframes_index(s, ioc,
492 max_pos) < 0)
493 av_log(s, AV_LOG_ERROR, "Keyframe index parsing failed\n");
494 else
495 add_keyframes_index(s);
496 while (avio_tell(ioc) < max_pos - 2 &&
497 amf_get_string(ioc, str_val, sizeof(str_val)) > 0)
498 if (amf_parse_object(s, astream, vstream, str_val, max_pos,
499 depth + 1) < 0)
500 return -1; // if we couldn't skip, bomb out.
501 if (avio_r8(ioc) != AMF_END_OF_OBJECT) {
502 av_log(s, AV_LOG_ERROR, "Missing AMF_END_OF_OBJECT in AMF_DATA_TYPE_OBJECT\n");
503 return -1;
504 }
505 break;
506 case AMF_DATA_TYPE_NULL:
507 case AMF_DATA_TYPE_UNDEFINED:
508 case AMF_DATA_TYPE_UNSUPPORTED:
509 break; // these take up no additional space
510 case AMF_DATA_TYPE_MIXEDARRAY:
511 {
512 unsigned v;
513 avio_skip(ioc, 4); // skip 32-bit max array index
514 while (avio_tell(ioc) < max_pos - 2 &&
515 amf_get_string(ioc, str_val, sizeof(str_val)) > 0)
516 // this is the only case in which we would want a nested
517 // parse to not skip over the object
518 if (amf_parse_object(s, astream, vstream, str_val, max_pos,
519 depth + 1) < 0)
520 return -1;
521 v = avio_r8(ioc);
522 if (v != AMF_END_OF_OBJECT) {
523 av_log(s, AV_LOG_ERROR, "Missing AMF_END_OF_OBJECT in AMF_DATA_TYPE_MIXEDARRAY, found %d\n", v);
524 return -1;
525 }
526 break;
527 }
528 case AMF_DATA_TYPE_ARRAY:
529 {
530 unsigned int arraylen, i;
531
532 arraylen = avio_rb32(ioc);
533 for (i = 0; i < arraylen && avio_tell(ioc) < max_pos - 1; i++)
534 if (amf_parse_object(s, NULL, NULL, NULL, max_pos,
535 depth + 1) < 0)
536 return -1; // if we couldn't skip, bomb out.
537 }
538 break;
539 case AMF_DATA_TYPE_DATE:
540 avio_skip(ioc, 8 + 2); // timestamp (double) and UTC offset (int16)
541 break;
542 default: // unsupported type, we couldn't skip
543 av_log(s, AV_LOG_ERROR, "unsupported amf type %d\n", amf_type);
544 return -1;
545 }
546
547 if (key) {
548 apar = astream ? astream->codecpar : NULL;
549 vpar = vstream ? vstream->codecpar : NULL;
550
551 // stream info doesn't live any deeper than the first object
552 if (depth == 1) {
553 if (amf_type == AMF_DATA_TYPE_NUMBER ||
554 amf_type == AMF_DATA_TYPE_BOOL) {
555 if (!strcmp(key, "duration"))
556 s->duration = num_val * AV_TIME_BASE;
557 else if (!strcmp(key, "videodatarate") &&
558 0 <= (int)(num_val * 1024.0))
559 flv->video_bit_rate = num_val * 1024.0;
560 else if (!strcmp(key, "audiodatarate") &&
561 0 <= (int)(num_val * 1024.0))
562 flv->audio_bit_rate = num_val * 1024.0;
563 else if (!strcmp(key, "datastream")) {
564 AVStream *st = create_stream(s, AVMEDIA_TYPE_SUBTITLE);
565 if (!st)
566 return AVERROR(ENOMEM);
567 st->codecpar->codec_id = AV_CODEC_ID_TEXT;
568 } else if (!strcmp(key, "framerate")) {
569 flv->framerate = av_d2q(num_val, 1000);
570 if (vstream)
571 vstream->avg_frame_rate = flv->framerate;
572 } else if (flv->trust_metadata) {
573 if (!strcmp(key, "videocodecid") && vpar) {
574 int ret = flv_set_video_codec(s, vstream, num_val, 0);
575 if (ret < 0)
576 return ret;
577 } else if (!strcmp(key, "audiocodecid") && apar) {
578 int id = ((int)num_val) << FLV_AUDIO_CODECID_OFFSET;
579 flv_set_audio_codec(s, astream, apar, id);
580 } else if (!strcmp(key, "audiosamplerate") && apar) {
581 apar->sample_rate = num_val;
582 } else if (!strcmp(key, "audiosamplesize") && apar) {
583 apar->bits_per_coded_sample = num_val;
584 } else if (!strcmp(key, "stereo") && apar) {
585 apar->channels = num_val + 1;
586 apar->channel_layout = apar->channels == 2 ?
587 AV_CH_LAYOUT_STEREO :
588 AV_CH_LAYOUT_MONO;
589 } else if (!strcmp(key, "width") && vpar) {
590 vpar->width = num_val;
591 } else if (!strcmp(key, "height") && vpar) {
592 vpar->height = num_val;
593 }
594 }
595 }
596 if (amf_type == AMF_DATA_TYPE_STRING) {
597 if (!strcmp(key, "encoder")) {
598 int version = -1;
599 if (1 == sscanf(str_val, "Open Broadcaster Software v0.%d", &version)) {
600 if (version > 0 && version <= 655)
601 flv->broken_sizes = 1;
602 }
603 } else if (!strcmp(key, "metadatacreator")) {
604 if ( !strcmp (str_val, "MEGA")
605 || !strncmp(str_val, "FlixEngine", 10))
606 flv->broken_sizes = 1;
607 }
608 }
609 }
610
611 if (amf_type == AMF_DATA_TYPE_OBJECT && s->nb_streams == 1 &&
612 ((!apar && !strcmp(key, "audiocodecid")) ||
613 (!vpar && !strcmp(key, "videocodecid"))))
614 s->ctx_flags &= ~AVFMTCTX_NOHEADER; //If there is either audio/video missing, codecid will be an empty object
615
616 if ((!strcmp(key, "duration") ||
617 !strcmp(key, "filesize") ||
618 !strcmp(key, "width") ||
619 !strcmp(key, "height") ||
620 !strcmp(key, "videodatarate") ||
621 !strcmp(key, "framerate") ||
622 !strcmp(key, "videocodecid") ||
623 !strcmp(key, "audiodatarate") ||
624 !strcmp(key, "audiosamplerate") ||
625 !strcmp(key, "audiosamplesize") ||
626 !strcmp(key, "stereo") ||
627 !strcmp(key, "audiocodecid") ||
628 !strcmp(key, "datastream")) && !flv->dump_full_metadata)
629 return 0;
630
631 s->event_flags |= AVFMT_EVENT_FLAG_METADATA_UPDATED;
632 if (amf_type == AMF_DATA_TYPE_BOOL) {
633 av_strlcpy(str_val, num_val > 0 ? "true" : "false",
634 sizeof(str_val));
635 av_dict_set(&s->metadata, key, str_val, 0);
636 } else if (amf_type == AMF_DATA_TYPE_NUMBER) {
637 snprintf(str_val, sizeof(str_val), "%.f", num_val);
638 av_dict_set(&s->metadata, key, str_val, 0);
639 } else if (amf_type == AMF_DATA_TYPE_STRING)
640 av_dict_set(&s->metadata, key, str_val, 0);
641 }
642
643 return 0;
644 }
645
646 #define TYPE_ONTEXTDATA 1
647 #define TYPE_ONCAPTION 2
648 #define TYPE_ONCAPTIONINFO 3
649 #define TYPE_UNKNOWN 9
650
flv_read_metabody(AVFormatContext * s,int64_t next_pos)651 static int flv_read_metabody(AVFormatContext *s, int64_t next_pos)
652 {
653 FLVContext *flv = s->priv_data;
654 AMFDataType type;
655 AVStream *stream, *astream, *vstream;
656 AVStream av_unused *dstream;
657 AVIOContext *ioc;
658 int i;
659 char buffer[32];
660
661 astream = NULL;
662 vstream = NULL;
663 dstream = NULL;
664 ioc = s->pb;
665
666 // first object needs to be "onMetaData" string
667 type = avio_r8(ioc);
668 if (type != AMF_DATA_TYPE_STRING ||
669 amf_get_string(ioc, buffer, sizeof(buffer)) < 0)
670 return TYPE_UNKNOWN;
671
672 if (!strcmp(buffer, "onTextData"))
673 return TYPE_ONTEXTDATA;
674
675 if (!strcmp(buffer, "onCaption"))
676 return TYPE_ONCAPTION;
677
678 if (!strcmp(buffer, "onCaptionInfo"))
679 return TYPE_ONCAPTIONINFO;
680
681 if (strcmp(buffer, "onMetaData") && strcmp(buffer, "onCuePoint")) {
682 av_log(s, AV_LOG_DEBUG, "Unknown type %s\n", buffer);
683 return TYPE_UNKNOWN;
684 }
685
686 // find the streams now so that amf_parse_object doesn't need to do
687 // the lookup every time it is called.
688 for (i = 0; i < s->nb_streams; i++) {
689 stream = s->streams[i];
690 if (stream->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
691 vstream = stream;
692 flv->last_keyframe_stream_index = i;
693 } else if (stream->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
694 astream = stream;
695 if (flv->last_keyframe_stream_index == -1)
696 flv->last_keyframe_stream_index = i;
697 }
698 else if (stream->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE)
699 dstream = stream;
700 }
701
702 // parse the second object (we want a mixed array)
703 if (amf_parse_object(s, astream, vstream, buffer, next_pos, 0) < 0)
704 return -1;
705
706 return 0;
707 }
708
flv_read_header(AVFormatContext * s)709 static int flv_read_header(AVFormatContext *s)
710 {
711 int flags;
712 FLVContext *flv = s->priv_data;
713 int offset;
714 int pre_tag_size = 0;
715
716 avio_skip(s->pb, 4);
717 flags = avio_r8(s->pb);
718
719 flv->missing_streams = flags & (FLV_HEADER_FLAG_HASVIDEO | FLV_HEADER_FLAG_HASAUDIO);
720
721 s->ctx_flags |= AVFMTCTX_NOHEADER;
722
723 offset = avio_rb32(s->pb);
724 avio_seek(s->pb, offset, SEEK_SET);
725
726 /* Annex E. The FLV File Format
727 * E.3 TheFLVFileBody
728 * Field Type Comment
729 * PreviousTagSize0 UI32 Always 0
730 * */
731 pre_tag_size = avio_rb32(s->pb);
732 if (pre_tag_size) {
733 av_log(s, AV_LOG_WARNING, "Read FLV header error, input file is not a standard flv format, first PreviousTagSize0 always is 0\n");
734 }
735
736 s->start_time = 0;
737 flv->sum_flv_tag_size = 0;
738 flv->last_keyframe_stream_index = -1;
739
740 return 0;
741 }
742
flv_read_close(AVFormatContext * s)743 static int flv_read_close(AVFormatContext *s)
744 {
745 int i;
746 FLVContext *flv = s->priv_data;
747 for (i=0; i<FLV_STREAM_TYPE_NB; i++)
748 av_freep(&flv->new_extradata[i]);
749 av_freep(&flv->keyframe_times);
750 av_freep(&flv->keyframe_filepositions);
751 return 0;
752 }
753
flv_get_extradata(AVFormatContext * s,AVStream * st,int size)754 static int flv_get_extradata(AVFormatContext *s, AVStream *st, int size)
755 {
756 if (!size)
757 return 0;
758
759 av_freep(&st->codecpar->extradata);
760 if (ff_get_extradata(s, st->codecpar, s->pb, size) < 0)
761 return AVERROR(ENOMEM);
762 st->internal->need_context_update = 1;
763 return 0;
764 }
765
flv_queue_extradata(FLVContext * flv,AVIOContext * pb,int stream,int size)766 static int flv_queue_extradata(FLVContext *flv, AVIOContext *pb, int stream,
767 int size)
768 {
769 if (!size)
770 return 0;
771
772 av_free(flv->new_extradata[stream]);
773 flv->new_extradata[stream] = av_mallocz(size +
774 AV_INPUT_BUFFER_PADDING_SIZE);
775 if (!flv->new_extradata[stream])
776 return AVERROR(ENOMEM);
777 flv->new_extradata_size[stream] = size;
778 avio_read(pb, flv->new_extradata[stream], size);
779 return 0;
780 }
781
clear_index_entries(AVFormatContext * s,int64_t pos)782 static void clear_index_entries(AVFormatContext *s, int64_t pos)
783 {
784 int i, j, out;
785 av_log(s, AV_LOG_WARNING,
786 "Found invalid index entries, clearing the index.\n");
787 for (i = 0; i < s->nb_streams; i++) {
788 AVStream *st = s->streams[i];
789 /* Remove all index entries that point to >= pos */
790 out = 0;
791 for (j = 0; j < st->nb_index_entries; j++)
792 if (st->index_entries[j].pos < pos)
793 st->index_entries[out++] = st->index_entries[j];
794 st->nb_index_entries = out;
795 }
796 }
797
amf_skip_tag(AVIOContext * pb,AMFDataType type)798 static int amf_skip_tag(AVIOContext *pb, AMFDataType type)
799 {
800 int nb = -1, ret, parse_name = 1;
801
802 switch (type) {
803 case AMF_DATA_TYPE_NUMBER:
804 avio_skip(pb, 8);
805 break;
806 case AMF_DATA_TYPE_BOOL:
807 avio_skip(pb, 1);
808 break;
809 case AMF_DATA_TYPE_STRING:
810 avio_skip(pb, avio_rb16(pb));
811 break;
812 case AMF_DATA_TYPE_ARRAY:
813 parse_name = 0;
814 case AMF_DATA_TYPE_MIXEDARRAY:
815 nb = avio_rb32(pb);
816 case AMF_DATA_TYPE_OBJECT:
817 while(!pb->eof_reached && (nb-- > 0 || type != AMF_DATA_TYPE_ARRAY)) {
818 if (parse_name) {
819 int size = avio_rb16(pb);
820 if (!size) {
821 avio_skip(pb, 1);
822 break;
823 }
824 avio_skip(pb, size);
825 }
826 if ((ret = amf_skip_tag(pb, avio_r8(pb))) < 0)
827 return ret;
828 }
829 break;
830 case AMF_DATA_TYPE_NULL:
831 case AMF_DATA_TYPE_OBJECT_END:
832 break;
833 default:
834 return AVERROR_INVALIDDATA;
835 }
836 return 0;
837 }
838
flv_data_packet(AVFormatContext * s,AVPacket * pkt,int64_t dts,int64_t next)839 static int flv_data_packet(AVFormatContext *s, AVPacket *pkt,
840 int64_t dts, int64_t next)
841 {
842 AVIOContext *pb = s->pb;
843 AVStream *st = NULL;
844 char buf[20];
845 int ret = AVERROR_INVALIDDATA;
846 int i, length = -1;
847 int array = 0;
848
849 switch (avio_r8(pb)) {
850 case AMF_DATA_TYPE_ARRAY:
851 array = 1;
852 case AMF_DATA_TYPE_MIXEDARRAY:
853 avio_seek(pb, 4, SEEK_CUR);
854 case AMF_DATA_TYPE_OBJECT:
855 break;
856 default:
857 goto skip;
858 }
859
860 while (array || (ret = amf_get_string(pb, buf, sizeof(buf))) > 0) {
861 AMFDataType type = avio_r8(pb);
862 if (type == AMF_DATA_TYPE_STRING && (array || !strcmp(buf, "text"))) {
863 length = avio_rb16(pb);
864 ret = av_get_packet(pb, pkt, length);
865 if (ret < 0)
866 goto skip;
867 else
868 break;
869 } else {
870 if ((ret = amf_skip_tag(pb, type)) < 0)
871 goto skip;
872 }
873 }
874
875 if (length < 0) {
876 ret = AVERROR_INVALIDDATA;
877 goto skip;
878 }
879
880 for (i = 0; i < s->nb_streams; i++) {
881 st = s->streams[i];
882 if (st->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE)
883 break;
884 }
885
886 if (i == s->nb_streams) {
887 st = create_stream(s, AVMEDIA_TYPE_SUBTITLE);
888 if (!st)
889 return AVERROR(ENOMEM);
890 st->codecpar->codec_id = AV_CODEC_ID_TEXT;
891 }
892
893 pkt->dts = dts;
894 pkt->pts = dts;
895 pkt->size = ret;
896
897 pkt->stream_index = st->index;
898 pkt->flags |= AV_PKT_FLAG_KEY;
899
900 skip:
901 avio_seek(s->pb, next + 4, SEEK_SET);
902
903 return ret;
904 }
905
resync(AVFormatContext * s)906 static int resync(AVFormatContext *s)
907 {
908 FLVContext *flv = s->priv_data;
909 int64_t i;
910 int64_t pos = avio_tell(s->pb);
911
912 for (i=0; !avio_feof(s->pb); i++) {
913 int j = i & (RESYNC_BUFFER_SIZE-1);
914 int j1 = j + RESYNC_BUFFER_SIZE;
915 flv->resync_buffer[j ] =
916 flv->resync_buffer[j1] = avio_r8(s->pb);
917
918 if (i > 22) {
919 unsigned lsize2 = AV_RB32(flv->resync_buffer + j1 - 4);
920 if (lsize2 >= 11 && lsize2 + 8LL < FFMIN(i, RESYNC_BUFFER_SIZE)) {
921 unsigned size2 = AV_RB24(flv->resync_buffer + j1 - lsize2 + 1 - 4);
922 unsigned lsize1 = AV_RB32(flv->resync_buffer + j1 - lsize2 - 8);
923 if (lsize1 >= 11 && lsize1 + 8LL + lsize2 < FFMIN(i, RESYNC_BUFFER_SIZE)) {
924 unsigned size1 = AV_RB24(flv->resync_buffer + j1 - lsize1 + 1 - lsize2 - 8);
925 if (size1 == lsize1 - 11 && size2 == lsize2 - 11) {
926 avio_seek(s->pb, pos + i - lsize1 - lsize2 - 8, SEEK_SET);
927 return 1;
928 }
929 }
930 }
931 }
932 }
933 return AVERROR_EOF;
934 }
935
flv_read_packet(AVFormatContext * s,AVPacket * pkt)936 static int flv_read_packet(AVFormatContext *s, AVPacket *pkt)
937 {
938 FLVContext *flv = s->priv_data;
939 int ret, i, size, flags;
940 enum FlvTagType type;
941 int stream_type=-1;
942 int64_t next, pos, meta_pos;
943 int64_t dts, pts = AV_NOPTS_VALUE;
944 int av_uninit(channels);
945 int av_uninit(sample_rate);
946 AVStream *st = NULL;
947 int last = -1;
948 int orig_size;
949
950 retry:
951 /* pkt size is repeated at end. skip it */
952 pos = avio_tell(s->pb);
953 type = (avio_r8(s->pb) & 0x1F);
954 orig_size =
955 size = avio_rb24(s->pb);
956 flv->sum_flv_tag_size += size + 11;
957 dts = avio_rb24(s->pb);
958 dts |= (unsigned)avio_r8(s->pb) << 24;
959 av_log(s, AV_LOG_TRACE, "type:%d, size:%d, last:%d, dts:%"PRId64" pos:%"PRId64"\n", type, size, last, dts, avio_tell(s->pb));
960 if (avio_feof(s->pb))
961 return AVERROR_EOF;
962 avio_skip(s->pb, 3); /* stream id, always 0 */
963 flags = 0;
964
965 if (flv->validate_next < flv->validate_count) {
966 int64_t validate_pos = flv->validate_index[flv->validate_next].pos;
967 if (pos == validate_pos) {
968 if (FFABS(dts - flv->validate_index[flv->validate_next].dts) <=
969 VALIDATE_INDEX_TS_THRESH) {
970 flv->validate_next++;
971 } else {
972 clear_index_entries(s, validate_pos);
973 flv->validate_count = 0;
974 }
975 } else if (pos > validate_pos) {
976 clear_index_entries(s, validate_pos);
977 flv->validate_count = 0;
978 }
979 }
980
981 if (size == 0) {
982 ret = FFERROR_REDO;
983 goto leave;
984 }
985
986 next = size + avio_tell(s->pb);
987
988 if (type == FLV_TAG_TYPE_AUDIO) {
989 stream_type = FLV_STREAM_TYPE_AUDIO;
990 flags = avio_r8(s->pb);
991 size--;
992 } else if (type == FLV_TAG_TYPE_VIDEO) {
993 stream_type = FLV_STREAM_TYPE_VIDEO;
994 flags = avio_r8(s->pb);
995 size--;
996 if ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_VIDEO_INFO_CMD)
997 goto skip;
998 } else if (type == FLV_TAG_TYPE_META) {
999 stream_type=FLV_STREAM_TYPE_DATA;
1000 if (size > 13 + 1 + 4) { // Header-type metadata stuff
1001 int type;
1002 meta_pos = avio_tell(s->pb);
1003 type = flv_read_metabody(s, next);
1004 if (type == 0 && dts == 0 || type < 0 || type == TYPE_UNKNOWN) {
1005 if (type < 0 && flv->validate_count &&
1006 flv->validate_index[0].pos > next &&
1007 flv->validate_index[0].pos - 4 < next
1008 ) {
1009 av_log(s, AV_LOG_WARNING, "Adjusting next position due to index mismatch\n");
1010 next = flv->validate_index[0].pos - 4;
1011 }
1012 goto skip;
1013 } else if (type == TYPE_ONTEXTDATA) {
1014 avpriv_request_sample(s, "OnTextData packet");
1015 return flv_data_packet(s, pkt, dts, next);
1016 } else if (type == TYPE_ONCAPTION) {
1017 return flv_data_packet(s, pkt, dts, next);
1018 }
1019 avio_seek(s->pb, meta_pos, SEEK_SET);
1020 }
1021 } else {
1022 av_log(s, AV_LOG_DEBUG,
1023 "Skipping flv packet: type %d, size %d, flags %d.\n",
1024 type, size, flags);
1025 skip:
1026 if (avio_seek(s->pb, next, SEEK_SET) != next) {
1027 // This can happen if flv_read_metabody above read past
1028 // next, on a non-seekable input, and the preceding data has
1029 // been flushed out from the IO buffer.
1030 av_log(s, AV_LOG_ERROR, "Unable to seek to the next packet\n");
1031 return AVERROR_INVALIDDATA;
1032 }
1033 ret = FFERROR_REDO;
1034 goto leave;
1035 }
1036
1037 /* skip empty data packets */
1038 if (!size) {
1039 ret = FFERROR_REDO;
1040 goto leave;
1041 }
1042
1043 /* now find stream */
1044 for (i = 0; i < s->nb_streams; i++) {
1045 st = s->streams[i];
1046 if (stream_type == FLV_STREAM_TYPE_AUDIO) {
1047 if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO &&
1048 (s->audio_codec_id || flv_same_audio_codec(st->codecpar, flags)))
1049 break;
1050 } else if (stream_type == FLV_STREAM_TYPE_VIDEO) {
1051 if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO &&
1052 (s->video_codec_id || flv_same_video_codec(st->codecpar, flags)))
1053 break;
1054 } else if (stream_type == FLV_STREAM_TYPE_DATA) {
1055 if (st->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE)
1056 break;
1057 }
1058 }
1059 if (i == s->nb_streams) {
1060 static const enum AVMediaType stream_types[] = {AVMEDIA_TYPE_VIDEO, AVMEDIA_TYPE_AUDIO, AVMEDIA_TYPE_SUBTITLE};
1061 st = create_stream(s, stream_types[stream_type]);
1062 if (!st)
1063 return AVERROR(ENOMEM);
1064
1065 }
1066 av_log(s, AV_LOG_TRACE, "%d %X %d \n", stream_type, flags, st->discard);
1067
1068 if ((s->pb->seekable & AVIO_SEEKABLE_NORMAL) &&
1069 ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY ||
1070 stream_type == FLV_STREAM_TYPE_AUDIO))
1071 av_add_index_entry(st, pos, dts, size, 0, AVINDEX_KEYFRAME);
1072
1073 if ( (st->discard >= AVDISCARD_NONKEY && !((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY || (stream_type == FLV_STREAM_TYPE_AUDIO)))
1074 ||(st->discard >= AVDISCARD_BIDIR && ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_DISP_INTER && (stream_type == FLV_STREAM_TYPE_VIDEO)))
1075 || st->discard >= AVDISCARD_ALL
1076 ) {
1077 avio_seek(s->pb, next, SEEK_SET);
1078 ret = FFERROR_REDO;
1079 goto leave;
1080 }
1081
1082 // if not streamed and no duration from metadata then seek to end to find
1083 // the duration from the timestamps
1084 if ((s->pb->seekable & AVIO_SEEKABLE_NORMAL) &&
1085 (!s->duration || s->duration == AV_NOPTS_VALUE) &&
1086 !flv->searched_for_end) {
1087 int size;
1088 const int64_t pos = avio_tell(s->pb);
1089 // Read the last 4 bytes of the file, this should be the size of the
1090 // previous FLV tag. Use the timestamp of its payload as duration.
1091 int64_t fsize = avio_size(s->pb);
1092 retry_duration:
1093 avio_seek(s->pb, fsize - 4, SEEK_SET);
1094 size = avio_rb32(s->pb);
1095 if (size > 0 && size < fsize) {
1096 // Seek to the start of the last FLV tag at position (fsize - 4 - size)
1097 // but skip the byte indicating the type.
1098 avio_seek(s->pb, fsize - 3 - size, SEEK_SET);
1099 if (size == avio_rb24(s->pb) + 11) {
1100 uint32_t ts = avio_rb24(s->pb);
1101 ts |= avio_r8(s->pb) << 24;
1102 if (ts)
1103 s->duration = ts * (int64_t)AV_TIME_BASE / 1000;
1104 else if (fsize >= 8 && fsize - 8 >= size) {
1105 fsize -= size+4;
1106 goto retry_duration;
1107 }
1108 }
1109 }
1110
1111 avio_seek(s->pb, pos, SEEK_SET);
1112 flv->searched_for_end = 1;
1113 }
1114
1115 if (stream_type == FLV_STREAM_TYPE_AUDIO) {
1116 int bits_per_coded_sample;
1117 channels = (flags & FLV_AUDIO_CHANNEL_MASK) == FLV_STEREO ? 2 : 1;
1118 sample_rate = 44100 << ((flags & FLV_AUDIO_SAMPLERATE_MASK) >>
1119 FLV_AUDIO_SAMPLERATE_OFFSET) >> 3;
1120 bits_per_coded_sample = (flags & FLV_AUDIO_SAMPLESIZE_MASK) ? 16 : 8;
1121 if (!st->codecpar->channels || !st->codecpar->sample_rate ||
1122 !st->codecpar->bits_per_coded_sample) {
1123 st->codecpar->channels = channels;
1124 st->codecpar->channel_layout = channels == 1
1125 ? AV_CH_LAYOUT_MONO
1126 : AV_CH_LAYOUT_STEREO;
1127 st->codecpar->sample_rate = sample_rate;
1128 st->codecpar->bits_per_coded_sample = bits_per_coded_sample;
1129 }
1130 if (!st->codecpar->codec_id) {
1131 flv_set_audio_codec(s, st, st->codecpar,
1132 flags & FLV_AUDIO_CODECID_MASK);
1133 flv->last_sample_rate =
1134 sample_rate = st->codecpar->sample_rate;
1135 flv->last_channels =
1136 channels = st->codecpar->channels;
1137 } else {
1138 AVCodecParameters *par = avcodec_parameters_alloc();
1139 if (!par) {
1140 ret = AVERROR(ENOMEM);
1141 goto leave;
1142 }
1143 par->sample_rate = sample_rate;
1144 par->bits_per_coded_sample = bits_per_coded_sample;
1145 flv_set_audio_codec(s, st, par, flags & FLV_AUDIO_CODECID_MASK);
1146 sample_rate = par->sample_rate;
1147 avcodec_parameters_free(&par);
1148 }
1149 } else if (stream_type == FLV_STREAM_TYPE_VIDEO) {
1150 int ret = flv_set_video_codec(s, st, flags & FLV_VIDEO_CODECID_MASK, 1);
1151 if (ret < 0)
1152 return ret;
1153 size -= ret;
1154 } else if (stream_type == FLV_STREAM_TYPE_DATA) {
1155 st->codecpar->codec_id = AV_CODEC_ID_TEXT;
1156 }
1157
1158 if (st->codecpar->codec_id == AV_CODEC_ID_AAC ||
1159 st->codecpar->codec_id == AV_CODEC_ID_H264 ||
1160 st->codecpar->codec_id == AV_CODEC_ID_MPEG4) {
1161 int type = avio_r8(s->pb);
1162 size--;
1163
1164 if (size < 0) {
1165 ret = AVERROR_INVALIDDATA;
1166 goto leave;
1167 }
1168
1169 if (st->codecpar->codec_id == AV_CODEC_ID_H264 || st->codecpar->codec_id == AV_CODEC_ID_MPEG4) {
1170 // sign extension
1171 int32_t cts = (avio_rb24(s->pb) + 0xff800000) ^ 0xff800000;
1172 pts = dts + cts;
1173 if (cts < 0) { // dts might be wrong
1174 if (!flv->wrong_dts)
1175 av_log(s, AV_LOG_WARNING,
1176 "Negative cts, previous timestamps might be wrong.\n");
1177 flv->wrong_dts = 1;
1178 } else if (FFABS(dts - pts) > 1000*60*15) {
1179 av_log(s, AV_LOG_WARNING,
1180 "invalid timestamps %"PRId64" %"PRId64"\n", dts, pts);
1181 dts = pts = AV_NOPTS_VALUE;
1182 }
1183 }
1184 if (type == 0 && (!st->codecpar->extradata || st->codecpar->codec_id == AV_CODEC_ID_AAC ||
1185 st->codecpar->codec_id == AV_CODEC_ID_H264)) {
1186 AVDictionaryEntry *t;
1187
1188 if (st->codecpar->extradata) {
1189 if ((ret = flv_queue_extradata(flv, s->pb, stream_type, size)) < 0)
1190 return ret;
1191 ret = FFERROR_REDO;
1192 goto leave;
1193 }
1194 if ((ret = flv_get_extradata(s, st, size)) < 0)
1195 return ret;
1196
1197 /* Workaround for buggy Omnia A/XE encoder */
1198 t = av_dict_get(s->metadata, "Encoder", NULL, 0);
1199 if (st->codecpar->codec_id == AV_CODEC_ID_AAC && t && !strcmp(t->value, "Omnia A/XE"))
1200 st->codecpar->extradata_size = 2;
1201
1202 if (st->codecpar->codec_id == AV_CODEC_ID_AAC && 0) {
1203 MPEG4AudioConfig cfg;
1204
1205 if (avpriv_mpeg4audio_get_config(&cfg, st->codecpar->extradata,
1206 st->codecpar->extradata_size * 8, 1) >= 0) {
1207 st->codecpar->channels = cfg.channels;
1208 st->codecpar->channel_layout = 0;
1209 if (cfg.ext_sample_rate)
1210 st->codecpar->sample_rate = cfg.ext_sample_rate;
1211 else
1212 st->codecpar->sample_rate = cfg.sample_rate;
1213 av_log(s, AV_LOG_TRACE, "mp4a config channels %d sample rate %d\n",
1214 st->codecpar->channels, st->codecpar->sample_rate);
1215 }
1216 }
1217
1218 ret = FFERROR_REDO;
1219 goto leave;
1220 }
1221 }
1222
1223 /* skip empty data packets */
1224 if (!size) {
1225 ret = FFERROR_REDO;
1226 goto leave;
1227 }
1228
1229 ret = av_get_packet(s->pb, pkt, size);
1230 if (ret < 0)
1231 return ret;
1232 pkt->dts = dts;
1233 pkt->pts = pts == AV_NOPTS_VALUE ? dts : pts;
1234 pkt->stream_index = st->index;
1235 pkt->pos = pos;
1236 if (flv->new_extradata[stream_type]) {
1237 uint8_t *side = av_packet_new_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA,
1238 flv->new_extradata_size[stream_type]);
1239 if (side) {
1240 memcpy(side, flv->new_extradata[stream_type],
1241 flv->new_extradata_size[stream_type]);
1242 av_freep(&flv->new_extradata[stream_type]);
1243 flv->new_extradata_size[stream_type] = 0;
1244 }
1245 }
1246 if (stream_type == FLV_STREAM_TYPE_AUDIO &&
1247 (sample_rate != flv->last_sample_rate ||
1248 channels != flv->last_channels)) {
1249 flv->last_sample_rate = sample_rate;
1250 flv->last_channels = channels;
1251 ff_add_param_change(pkt, channels, 0, sample_rate, 0, 0);
1252 }
1253
1254 if ( stream_type == FLV_STREAM_TYPE_AUDIO ||
1255 ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY) ||
1256 stream_type == FLV_STREAM_TYPE_DATA)
1257 pkt->flags |= AV_PKT_FLAG_KEY;
1258
1259 leave:
1260 last = avio_rb32(s->pb);
1261 if (!flv->trust_datasize) {
1262 if (last != orig_size + 11 && last != orig_size + 10 &&
1263 !avio_feof(s->pb) &&
1264 (last != orig_size || !last) && last != flv->sum_flv_tag_size &&
1265 !flv->broken_sizes) {
1266 av_log(s, AV_LOG_ERROR, "Packet mismatch %d %d %d\n", last, orig_size + 11, flv->sum_flv_tag_size);
1267 avio_seek(s->pb, pos + 1, SEEK_SET);
1268 ret = resync(s);
1269 av_packet_unref(pkt);
1270 if (ret >= 0) {
1271 goto retry;
1272 }
1273 }
1274 }
1275 return ret;
1276 }
1277
flv_read_seek(AVFormatContext * s,int stream_index,int64_t ts,int flags)1278 static int flv_read_seek(AVFormatContext *s, int stream_index,
1279 int64_t ts, int flags)
1280 {
1281 FLVContext *flv = s->priv_data;
1282 flv->validate_count = 0;
1283 return avio_seek_time(s->pb, stream_index, ts, flags);
1284 }
1285
1286 #define OFFSET(x) offsetof(FLVContext, x)
1287 #define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM
1288 static const AVOption options[] = {
1289 { "flv_metadata", "Allocate streams according to the onMetaData array", OFFSET(trust_metadata), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, VD },
1290 { "flv_full_metadata", "Dump full metadata of the onMetadata", OFFSET(dump_full_metadata), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, VD },
1291 { "flv_ignore_prevtag", "Ignore the Size of previous tag", OFFSET(trust_datasize), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, VD },
1292 { "missing_streams", "", OFFSET(missing_streams), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 0xFF, VD | AV_OPT_FLAG_EXPORT | AV_OPT_FLAG_READONLY },
1293 { NULL }
1294 };
1295
1296 static const AVClass flv_class = {
1297 .class_name = "flvdec",
1298 .item_name = av_default_item_name,
1299 .option = options,
1300 .version = LIBAVUTIL_VERSION_INT,
1301 };
1302
1303 AVInputFormat ff_flv_demuxer = {
1304 .name = "flv",
1305 .long_name = NULL_IF_CONFIG_SMALL("FLV (Flash Video)"),
1306 .priv_data_size = sizeof(FLVContext),
1307 .read_probe = flv_probe,
1308 .read_header = flv_read_header,
1309 .read_packet = flv_read_packet,
1310 .read_seek = flv_read_seek,
1311 .read_close = flv_read_close,
1312 .extensions = "flv",
1313 .priv_class = &flv_class,
1314 };
1315
1316 static const AVClass live_flv_class = {
1317 .class_name = "live_flvdec",
1318 .item_name = av_default_item_name,
1319 .option = options,
1320 .version = LIBAVUTIL_VERSION_INT,
1321 };
1322
1323 AVInputFormat ff_live_flv_demuxer = {
1324 .name = "live_flv",
1325 .long_name = NULL_IF_CONFIG_SMALL("live RTMP FLV (Flash Video)"),
1326 .priv_data_size = sizeof(FLVContext),
1327 .read_probe = live_flv_probe,
1328 .read_header = flv_read_header,
1329 .read_packet = flv_read_packet,
1330 .read_seek = flv_read_seek,
1331 .read_close = flv_read_close,
1332 .extensions = "flv",
1333 .priv_class = &live_flv_class,
1334 .flags = AVFMT_TS_DISCONT
1335 };
1336