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 "libavutil/time_internal.h"
34 #include "libavcodec/bytestream.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 #define MAX_DEPTH 16 ///< arbitrary limit to prevent unbounded recursion
45
46 typedef struct FLVContext {
47 const AVClass *class; ///< Class for private options.
48 int trust_metadata; ///< configure streams according onMetaData
49 int trust_datasize; ///< trust data size of FLVTag
50 int dump_full_metadata; ///< Dump full metadata of the onMetadata
51 int wrong_dts; ///< wrong dts due to negative cts
52 uint8_t *new_extradata[FLV_STREAM_TYPE_NB];
53 int new_extradata_size[FLV_STREAM_TYPE_NB];
54 int last_sample_rate;
55 int last_channels;
56 struct {
57 int64_t dts;
58 int64_t pos;
59 } validate_index[2];
60 int validate_next;
61 int validate_count;
62 int searched_for_end;
63
64 uint8_t resync_buffer[2*RESYNC_BUFFER_SIZE];
65
66 int broken_sizes;
67 int sum_flv_tag_size;
68
69 int last_keyframe_stream_index;
70 int keyframe_count;
71 int64_t video_bit_rate;
72 int64_t audio_bit_rate;
73 int64_t *keyframe_times;
74 int64_t *keyframe_filepositions;
75 int missing_streams;
76 AVRational framerate;
77 int64_t last_ts;
78 int64_t time_offset;
79 int64_t time_pos;
80 } FLVContext;
81
82 /* AMF date type */
83 typedef struct amf_date {
84 double milliseconds;
85 int16_t timezone;
86 } amf_date;
87
probe(const AVProbeData * p,int live)88 static int probe(const AVProbeData *p, int live)
89 {
90 const uint8_t *d = p->buf;
91 unsigned offset = AV_RB32(d + 5);
92
93 if (d[0] == 'F' &&
94 d[1] == 'L' &&
95 d[2] == 'V' &&
96 d[3] < 5 && d[5] == 0 &&
97 offset + 100 < p->buf_size &&
98 offset > 8) {
99 int is_live = !memcmp(d + offset + 40, "NGINX RTMP", 10);
100
101 if (live == is_live)
102 return AVPROBE_SCORE_MAX;
103 }
104 return 0;
105 }
106
flv_probe(const AVProbeData * p)107 static int flv_probe(const AVProbeData *p)
108 {
109 return probe(p, 0);
110 }
111
live_flv_probe(const AVProbeData * p)112 static int live_flv_probe(const AVProbeData *p)
113 {
114 return probe(p, 1);
115 }
116
kux_probe(const AVProbeData * p)117 static int kux_probe(const AVProbeData *p)
118 {
119 const uint8_t *d = p->buf;
120
121 if (d[0] == 'K' &&
122 d[1] == 'D' &&
123 d[2] == 'K' &&
124 d[3] == 0 &&
125 d[4] == 0) {
126 return AVPROBE_SCORE_EXTENSION + 1;
127 }
128 return 0;
129 }
130
add_keyframes_index(AVFormatContext * s)131 static void add_keyframes_index(AVFormatContext *s)
132 {
133 FLVContext *flv = s->priv_data;
134 AVStream *stream = NULL;
135 unsigned int i = 0;
136
137 if (flv->last_keyframe_stream_index < 0) {
138 av_log(s, AV_LOG_DEBUG, "keyframe stream hasn't been created\n");
139 return;
140 }
141
142 av_assert0(flv->last_keyframe_stream_index <= s->nb_streams);
143 stream = s->streams[flv->last_keyframe_stream_index];
144
145 if (stream->nb_index_entries == 0) {
146 for (i = 0; i < flv->keyframe_count; i++) {
147 av_log(s, AV_LOG_TRACE, "keyframe filepositions = %"PRId64" times = %"PRId64"\n",
148 flv->keyframe_filepositions[i], flv->keyframe_times[i] * 1000);
149 av_add_index_entry(stream, flv->keyframe_filepositions[i],
150 flv->keyframe_times[i] * 1000, 0, 0, AVINDEX_KEYFRAME);
151 }
152 } else
153 av_log(s, AV_LOG_WARNING, "Skipping duplicate index\n");
154
155 if (stream->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
156 av_freep(&flv->keyframe_times);
157 av_freep(&flv->keyframe_filepositions);
158 flv->keyframe_count = 0;
159 }
160 }
161
create_stream(AVFormatContext * s,int codec_type)162 static AVStream *create_stream(AVFormatContext *s, int codec_type)
163 {
164 FLVContext *flv = s->priv_data;
165 AVStream *st = avformat_new_stream(s, NULL);
166 if (!st)
167 return NULL;
168 st->codecpar->codec_type = codec_type;
169 if (s->nb_streams>=3 ||( s->nb_streams==2
170 && s->streams[0]->codecpar->codec_type != AVMEDIA_TYPE_SUBTITLE
171 && s->streams[1]->codecpar->codec_type != AVMEDIA_TYPE_SUBTITLE
172 && s->streams[0]->codecpar->codec_type != AVMEDIA_TYPE_DATA
173 && s->streams[1]->codecpar->codec_type != AVMEDIA_TYPE_DATA))
174 s->ctx_flags &= ~AVFMTCTX_NOHEADER;
175 if (codec_type == AVMEDIA_TYPE_AUDIO) {
176 st->codecpar->bit_rate = flv->audio_bit_rate;
177 flv->missing_streams &= ~FLV_HEADER_FLAG_HASAUDIO;
178 }
179 if (codec_type == AVMEDIA_TYPE_VIDEO) {
180 st->codecpar->bit_rate = flv->video_bit_rate;
181 flv->missing_streams &= ~FLV_HEADER_FLAG_HASVIDEO;
182 st->avg_frame_rate = flv->framerate;
183 }
184
185
186 avpriv_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
187 flv->last_keyframe_stream_index = s->nb_streams - 1;
188 add_keyframes_index(s);
189 return st;
190 }
191
flv_same_audio_codec(AVCodecParameters * apar,int flags)192 static int flv_same_audio_codec(AVCodecParameters *apar, int flags)
193 {
194 int bits_per_coded_sample = (flags & FLV_AUDIO_SAMPLESIZE_MASK) ? 16 : 8;
195 int flv_codecid = flags & FLV_AUDIO_CODECID_MASK;
196 int codec_id;
197
198 if (!apar->codec_id && !apar->codec_tag)
199 return 1;
200
201 if (apar->bits_per_coded_sample != bits_per_coded_sample)
202 return 0;
203
204 switch (flv_codecid) {
205 // no distinction between S16 and S8 PCM codec flags
206 case FLV_CODECID_PCM:
207 codec_id = bits_per_coded_sample == 8
208 ? AV_CODEC_ID_PCM_U8
209 #if HAVE_BIGENDIAN
210 : AV_CODEC_ID_PCM_S16BE;
211 #else
212 : AV_CODEC_ID_PCM_S16LE;
213 #endif
214 return codec_id == apar->codec_id;
215 case FLV_CODECID_PCM_LE:
216 codec_id = bits_per_coded_sample == 8
217 ? AV_CODEC_ID_PCM_U8
218 : AV_CODEC_ID_PCM_S16LE;
219 return codec_id == apar->codec_id;
220 case FLV_CODECID_AAC:
221 return apar->codec_id == AV_CODEC_ID_AAC;
222 case FLV_CODECID_ADPCM:
223 return apar->codec_id == AV_CODEC_ID_ADPCM_SWF;
224 case FLV_CODECID_SPEEX:
225 return apar->codec_id == AV_CODEC_ID_SPEEX;
226 case FLV_CODECID_MP3:
227 return apar->codec_id == AV_CODEC_ID_MP3;
228 case FLV_CODECID_NELLYMOSER_8KHZ_MONO:
229 case FLV_CODECID_NELLYMOSER_16KHZ_MONO:
230 case FLV_CODECID_NELLYMOSER:
231 return apar->codec_id == AV_CODEC_ID_NELLYMOSER;
232 case FLV_CODECID_PCM_MULAW:
233 return apar->sample_rate == 8000 &&
234 apar->codec_id == AV_CODEC_ID_PCM_MULAW;
235 case FLV_CODECID_PCM_ALAW:
236 return apar->sample_rate == 8000 &&
237 apar->codec_id == AV_CODEC_ID_PCM_ALAW;
238 default:
239 return apar->codec_tag == (flv_codecid >> FLV_AUDIO_CODECID_OFFSET);
240 }
241 }
242
flv_set_audio_codec(AVFormatContext * s,AVStream * astream,AVCodecParameters * apar,int flv_codecid)243 static void flv_set_audio_codec(AVFormatContext *s, AVStream *astream,
244 AVCodecParameters *apar, int flv_codecid)
245 {
246 switch (flv_codecid) {
247 // no distinction between S16 and S8 PCM codec flags
248 case FLV_CODECID_PCM:
249 apar->codec_id = apar->bits_per_coded_sample == 8
250 ? AV_CODEC_ID_PCM_U8
251 #if HAVE_BIGENDIAN
252 : AV_CODEC_ID_PCM_S16BE;
253 #else
254 : AV_CODEC_ID_PCM_S16LE;
255 #endif
256 break;
257 case FLV_CODECID_PCM_LE:
258 apar->codec_id = apar->bits_per_coded_sample == 8
259 ? AV_CODEC_ID_PCM_U8
260 : AV_CODEC_ID_PCM_S16LE;
261 break;
262 case FLV_CODECID_AAC:
263 apar->codec_id = AV_CODEC_ID_AAC;
264 break;
265 case FLV_CODECID_ADPCM:
266 apar->codec_id = AV_CODEC_ID_ADPCM_SWF;
267 break;
268 case FLV_CODECID_SPEEX:
269 apar->codec_id = AV_CODEC_ID_SPEEX;
270 apar->sample_rate = 16000;
271 break;
272 case FLV_CODECID_MP3:
273 apar->codec_id = AV_CODEC_ID_MP3;
274 astream->need_parsing = AVSTREAM_PARSE_FULL;
275 break;
276 case FLV_CODECID_NELLYMOSER_8KHZ_MONO:
277 // in case metadata does not otherwise declare samplerate
278 apar->sample_rate = 8000;
279 apar->codec_id = AV_CODEC_ID_NELLYMOSER;
280 break;
281 case FLV_CODECID_NELLYMOSER_16KHZ_MONO:
282 apar->sample_rate = 16000;
283 apar->codec_id = AV_CODEC_ID_NELLYMOSER;
284 break;
285 case FLV_CODECID_NELLYMOSER:
286 apar->codec_id = AV_CODEC_ID_NELLYMOSER;
287 break;
288 case FLV_CODECID_PCM_MULAW:
289 apar->sample_rate = 8000;
290 apar->codec_id = AV_CODEC_ID_PCM_MULAW;
291 break;
292 case FLV_CODECID_PCM_ALAW:
293 apar->sample_rate = 8000;
294 apar->codec_id = AV_CODEC_ID_PCM_ALAW;
295 break;
296 default:
297 avpriv_request_sample(s, "Audio codec (%x)",
298 flv_codecid >> FLV_AUDIO_CODECID_OFFSET);
299 apar->codec_tag = flv_codecid >> FLV_AUDIO_CODECID_OFFSET;
300 }
301 }
302
flv_same_video_codec(AVCodecParameters * vpar,int flags)303 static int flv_same_video_codec(AVCodecParameters *vpar, int flags)
304 {
305 int flv_codecid = flags & FLV_VIDEO_CODECID_MASK;
306
307 if (!vpar->codec_id && !vpar->codec_tag)
308 return 1;
309
310 switch (flv_codecid) {
311 case FLV_CODECID_H263:
312 return vpar->codec_id == AV_CODEC_ID_FLV1;
313 case FLV_CODECID_SCREEN:
314 return vpar->codec_id == AV_CODEC_ID_FLASHSV;
315 case FLV_CODECID_SCREEN2:
316 return vpar->codec_id == AV_CODEC_ID_FLASHSV2;
317 case FLV_CODECID_VP6:
318 return vpar->codec_id == AV_CODEC_ID_VP6F;
319 case FLV_CODECID_VP6A:
320 return vpar->codec_id == AV_CODEC_ID_VP6A;
321 case FLV_CODECID_H264:
322 return vpar->codec_id == AV_CODEC_ID_H264;
323 default:
324 return vpar->codec_tag == flv_codecid;
325 }
326 }
327
flv_set_video_codec(AVFormatContext * s,AVStream * vstream,int flv_codecid,int read)328 static int flv_set_video_codec(AVFormatContext *s, AVStream *vstream,
329 int flv_codecid, int read)
330 {
331 int ret = 0;
332 AVCodecParameters *par = vstream->codecpar;
333 enum AVCodecID old_codec_id = vstream->codecpar->codec_id;
334 switch (flv_codecid) {
335 case FLV_CODECID_H263:
336 par->codec_id = AV_CODEC_ID_FLV1;
337 break;
338 case FLV_CODECID_REALH263:
339 par->codec_id = AV_CODEC_ID_H263;
340 break; // Really mean it this time
341 case FLV_CODECID_SCREEN:
342 par->codec_id = AV_CODEC_ID_FLASHSV;
343 break;
344 case FLV_CODECID_SCREEN2:
345 par->codec_id = AV_CODEC_ID_FLASHSV2;
346 break;
347 case FLV_CODECID_VP6:
348 par->codec_id = AV_CODEC_ID_VP6F;
349 case FLV_CODECID_VP6A:
350 if (flv_codecid == FLV_CODECID_VP6A)
351 par->codec_id = AV_CODEC_ID_VP6A;
352 if (read) {
353 if (par->extradata_size != 1) {
354 ff_alloc_extradata(par, 1);
355 }
356 if (par->extradata)
357 par->extradata[0] = avio_r8(s->pb);
358 else
359 avio_skip(s->pb, 1);
360 }
361 ret = 1; // 1 byte body size adjustment for flv_read_packet()
362 break;
363 case FLV_CODECID_H264:
364 par->codec_id = AV_CODEC_ID_H264;
365 vstream->need_parsing = AVSTREAM_PARSE_HEADERS;
366 ret = 3; // not 4, reading packet type will consume one byte
367 break;
368 case FLV_CODECID_MPEG4:
369 par->codec_id = AV_CODEC_ID_MPEG4;
370 ret = 3;
371 break;
372 default:
373 avpriv_request_sample(s, "Video codec (%x)", flv_codecid);
374 par->codec_tag = flv_codecid;
375 }
376
377 if (!vstream->internal->need_context_update && par->codec_id != old_codec_id) {
378 avpriv_request_sample(s, "Changing the codec id midstream");
379 return AVERROR_PATCHWELCOME;
380 }
381
382 return ret;
383 }
384
amf_get_string(AVIOContext * ioc,char * buffer,int buffsize)385 static int amf_get_string(AVIOContext *ioc, char *buffer, int buffsize)
386 {
387 int ret;
388 int length = avio_rb16(ioc);
389 if (length >= buffsize) {
390 avio_skip(ioc, length);
391 return -1;
392 }
393
394 ret = avio_read(ioc, buffer, length);
395 if (ret < 0)
396 return ret;
397 if (ret < length)
398 return AVERROR_INVALIDDATA;
399
400 buffer[length] = '\0';
401
402 return length;
403 }
404
parse_keyframes_index(AVFormatContext * s,AVIOContext * ioc,int64_t max_pos)405 static int parse_keyframes_index(AVFormatContext *s, AVIOContext *ioc, int64_t max_pos)
406 {
407 FLVContext *flv = s->priv_data;
408 unsigned int timeslen = 0, fileposlen = 0, i;
409 char str_val[256];
410 int64_t *times = NULL;
411 int64_t *filepositions = NULL;
412 int ret = AVERROR(ENOSYS);
413 int64_t initial_pos = avio_tell(ioc);
414
415 if (flv->keyframe_count > 0) {
416 av_log(s, AV_LOG_DEBUG, "keyframes have been parsed\n");
417 return 0;
418 }
419 av_assert0(!flv->keyframe_times);
420 av_assert0(!flv->keyframe_filepositions);
421
422 if (s->flags & AVFMT_FLAG_IGNIDX)
423 return 0;
424
425 while (avio_tell(ioc) < max_pos - 2 &&
426 amf_get_string(ioc, str_val, sizeof(str_val)) > 0) {
427 int64_t **current_array;
428 unsigned int arraylen;
429
430 // Expect array object in context
431 if (avio_r8(ioc) != AMF_DATA_TYPE_ARRAY)
432 break;
433
434 arraylen = avio_rb32(ioc);
435 if (arraylen>>28)
436 break;
437
438 if (!strcmp(KEYFRAMES_TIMESTAMP_TAG , str_val) && !times) {
439 current_array = ×
440 timeslen = arraylen;
441 } else if (!strcmp(KEYFRAMES_BYTEOFFSET_TAG, str_val) &&
442 !filepositions) {
443 current_array = &filepositions;
444 fileposlen = arraylen;
445 } else
446 // unexpected metatag inside keyframes, will not use such
447 // metadata for indexing
448 break;
449
450 if (!(*current_array = av_mallocz(sizeof(**current_array) * arraylen))) {
451 ret = AVERROR(ENOMEM);
452 goto finish;
453 }
454
455 for (i = 0; i < arraylen && avio_tell(ioc) < max_pos - 1; i++) {
456 double d;
457 if (avio_r8(ioc) != AMF_DATA_TYPE_NUMBER)
458 goto invalid;
459 d = av_int2double(avio_rb64(ioc));
460 if (isnan(d) || d < INT64_MIN || d > INT64_MAX)
461 goto invalid;
462 current_array[0][i] = d;
463 }
464 if (times && filepositions) {
465 // All done, exiting at a position allowing amf_parse_object
466 // to finish parsing the object
467 ret = 0;
468 break;
469 }
470 }
471
472 if (timeslen == fileposlen && fileposlen>1 && max_pos <= filepositions[0]) {
473 for (i = 0; i < FFMIN(2,fileposlen); i++) {
474 flv->validate_index[i].pos = filepositions[i];
475 flv->validate_index[i].dts = times[i] * 1000;
476 flv->validate_count = i + 1;
477 }
478 flv->keyframe_times = times;
479 flv->keyframe_filepositions = filepositions;
480 flv->keyframe_count = timeslen;
481 times = NULL;
482 filepositions = NULL;
483 } else {
484 invalid:
485 av_log(s, AV_LOG_WARNING, "Invalid keyframes object, skipping.\n");
486 }
487
488 finish:
489 av_freep(×);
490 av_freep(&filepositions);
491 avio_seek(ioc, initial_pos, SEEK_SET);
492 return ret;
493 }
494
amf_parse_object(AVFormatContext * s,AVStream * astream,AVStream * vstream,const char * key,int64_t max_pos,int depth)495 static int amf_parse_object(AVFormatContext *s, AVStream *astream,
496 AVStream *vstream, const char *key,
497 int64_t max_pos, int depth)
498 {
499 AVCodecParameters *apar, *vpar;
500 FLVContext *flv = s->priv_data;
501 AVIOContext *ioc;
502 AMFDataType amf_type;
503 char str_val[1024];
504 double num_val;
505 amf_date date;
506
507 if (depth > MAX_DEPTH)
508 return AVERROR_PATCHWELCOME;
509
510 num_val = 0;
511 ioc = s->pb;
512 if (avio_feof(ioc))
513 return AVERROR_EOF;
514 amf_type = avio_r8(ioc);
515
516 switch (amf_type) {
517 case AMF_DATA_TYPE_NUMBER:
518 num_val = av_int2double(avio_rb64(ioc));
519 break;
520 case AMF_DATA_TYPE_BOOL:
521 num_val = avio_r8(ioc);
522 break;
523 case AMF_DATA_TYPE_STRING:
524 if (amf_get_string(ioc, str_val, sizeof(str_val)) < 0) {
525 av_log(s, AV_LOG_ERROR, "AMF_DATA_TYPE_STRING parsing failed\n");
526 return -1;
527 }
528 break;
529 case AMF_DATA_TYPE_OBJECT:
530 if (key &&
531 (ioc->seekable & AVIO_SEEKABLE_NORMAL) &&
532 !strcmp(KEYFRAMES_TAG, key) && depth == 1)
533 if (parse_keyframes_index(s, ioc, max_pos) < 0)
534 av_log(s, AV_LOG_ERROR, "Keyframe index parsing failed\n");
535 else
536 add_keyframes_index(s);
537 while (avio_tell(ioc) < max_pos - 2 &&
538 amf_get_string(ioc, str_val, sizeof(str_val)) > 0)
539 if (amf_parse_object(s, astream, vstream, str_val, max_pos,
540 depth + 1) < 0)
541 return -1; // if we couldn't skip, bomb out.
542 if (avio_r8(ioc) != AMF_END_OF_OBJECT) {
543 av_log(s, AV_LOG_ERROR, "Missing AMF_END_OF_OBJECT in AMF_DATA_TYPE_OBJECT\n");
544 return -1;
545 }
546 break;
547 case AMF_DATA_TYPE_NULL:
548 case AMF_DATA_TYPE_UNDEFINED:
549 case AMF_DATA_TYPE_UNSUPPORTED:
550 break; // these take up no additional space
551 case AMF_DATA_TYPE_MIXEDARRAY:
552 {
553 unsigned v;
554 avio_skip(ioc, 4); // skip 32-bit max array index
555 while (avio_tell(ioc) < max_pos - 2 &&
556 amf_get_string(ioc, str_val, sizeof(str_val)) > 0)
557 // this is the only case in which we would want a nested
558 // parse to not skip over the object
559 if (amf_parse_object(s, astream, vstream, str_val, max_pos,
560 depth + 1) < 0)
561 return -1;
562 v = avio_r8(ioc);
563 if (v != AMF_END_OF_OBJECT) {
564 av_log(s, AV_LOG_ERROR, "Missing AMF_END_OF_OBJECT in AMF_DATA_TYPE_MIXEDARRAY, found %d\n", v);
565 return -1;
566 }
567 break;
568 }
569 case AMF_DATA_TYPE_ARRAY:
570 {
571 unsigned int arraylen, i;
572
573 arraylen = avio_rb32(ioc);
574 for (i = 0; i < arraylen && avio_tell(ioc) < max_pos - 1; i++)
575 if (amf_parse_object(s, NULL, NULL, NULL, max_pos,
576 depth + 1) < 0)
577 return -1; // if we couldn't skip, bomb out.
578 }
579 break;
580 case AMF_DATA_TYPE_DATE:
581 // timestamp (double) and UTC offset (int16)
582 date.milliseconds = av_int2double(avio_rb64(ioc));
583 date.timezone = avio_rb16(ioc);
584 break;
585 default: // unsupported type, we couldn't skip
586 av_log(s, AV_LOG_ERROR, "unsupported amf type %d\n", amf_type);
587 return -1;
588 }
589
590 if (key) {
591 apar = astream ? astream->codecpar : NULL;
592 vpar = vstream ? vstream->codecpar : NULL;
593
594 // stream info doesn't live any deeper than the first object
595 if (depth == 1) {
596 if (amf_type == AMF_DATA_TYPE_NUMBER ||
597 amf_type == AMF_DATA_TYPE_BOOL) {
598 if (!strcmp(key, "duration"))
599 s->duration = num_val * AV_TIME_BASE;
600 else if (!strcmp(key, "videodatarate") &&
601 0 <= (int)(num_val * 1024.0))
602 flv->video_bit_rate = num_val * 1024.0;
603 else if (!strcmp(key, "audiodatarate") &&
604 0 <= (int)(num_val * 1024.0))
605 flv->audio_bit_rate = num_val * 1024.0;
606 else if (!strcmp(key, "datastream")) {
607 AVStream *st = create_stream(s, AVMEDIA_TYPE_SUBTITLE);
608 if (!st)
609 return AVERROR(ENOMEM);
610 st->codecpar->codec_id = AV_CODEC_ID_TEXT;
611 } else if (!strcmp(key, "framerate")) {
612 flv->framerate = av_d2q(num_val, 1000);
613 if (vstream)
614 vstream->avg_frame_rate = flv->framerate;
615 } else if (flv->trust_metadata) {
616 if (!strcmp(key, "videocodecid") && vpar) {
617 int ret = flv_set_video_codec(s, vstream, num_val, 0);
618 if (ret < 0)
619 return ret;
620 } else if (!strcmp(key, "audiocodecid") && apar) {
621 int id = ((int)num_val) << FLV_AUDIO_CODECID_OFFSET;
622 flv_set_audio_codec(s, astream, apar, id);
623 } else if (!strcmp(key, "audiosamplerate") && apar) {
624 apar->sample_rate = num_val;
625 } else if (!strcmp(key, "audiosamplesize") && apar) {
626 apar->bits_per_coded_sample = num_val;
627 } else if (!strcmp(key, "stereo") && apar) {
628 apar->channels = num_val + 1;
629 apar->channel_layout = apar->channels == 2 ?
630 AV_CH_LAYOUT_STEREO :
631 AV_CH_LAYOUT_MONO;
632 } else if (!strcmp(key, "width") && vpar) {
633 vpar->width = num_val;
634 } else if (!strcmp(key, "height") && vpar) {
635 vpar->height = num_val;
636 }
637 }
638 }
639 if (amf_type == AMF_DATA_TYPE_STRING) {
640 if (!strcmp(key, "encoder")) {
641 int version = -1;
642 if (1 == sscanf(str_val, "Open Broadcaster Software v0.%d", &version)) {
643 if (version > 0 && version <= 655)
644 flv->broken_sizes = 1;
645 }
646 } else if (!strcmp(key, "metadatacreator")) {
647 if ( !strcmp (str_val, "MEGA")
648 || !strncmp(str_val, "FlixEngine", 10))
649 flv->broken_sizes = 1;
650 }
651 }
652 }
653
654 if (amf_type == AMF_DATA_TYPE_OBJECT && s->nb_streams == 1 &&
655 ((!apar && !strcmp(key, "audiocodecid")) ||
656 (!vpar && !strcmp(key, "videocodecid"))))
657 s->ctx_flags &= ~AVFMTCTX_NOHEADER; //If there is either audio/video missing, codecid will be an empty object
658
659 if ((!strcmp(key, "duration") ||
660 !strcmp(key, "filesize") ||
661 !strcmp(key, "width") ||
662 !strcmp(key, "height") ||
663 !strcmp(key, "videodatarate") ||
664 !strcmp(key, "framerate") ||
665 !strcmp(key, "videocodecid") ||
666 !strcmp(key, "audiodatarate") ||
667 !strcmp(key, "audiosamplerate") ||
668 !strcmp(key, "audiosamplesize") ||
669 !strcmp(key, "stereo") ||
670 !strcmp(key, "audiocodecid") ||
671 !strcmp(key, "datastream")) && !flv->dump_full_metadata)
672 return 0;
673
674 s->event_flags |= AVFMT_EVENT_FLAG_METADATA_UPDATED;
675 if (amf_type == AMF_DATA_TYPE_BOOL) {
676 av_strlcpy(str_val, num_val > 0 ? "true" : "false",
677 sizeof(str_val));
678 av_dict_set(&s->metadata, key, str_val, 0);
679 } else if (amf_type == AMF_DATA_TYPE_NUMBER) {
680 snprintf(str_val, sizeof(str_val), "%.f", num_val);
681 av_dict_set(&s->metadata, key, str_val, 0);
682 } else if (amf_type == AMF_DATA_TYPE_STRING) {
683 av_dict_set(&s->metadata, key, str_val, 0);
684 } else if (amf_type == AMF_DATA_TYPE_DATE) {
685 time_t time;
686 struct tm t;
687 char datestr[128];
688 time = date.milliseconds / 1000; // to seconds
689 localtime_r(&time, &t);
690 strftime(datestr, sizeof(datestr), "%a, %d %b %Y %H:%M:%S %z", &t);
691
692 av_dict_set(&s->metadata, key, datestr, 0);
693 }
694 }
695
696 return 0;
697 }
698
699 #define TYPE_ONTEXTDATA 1
700 #define TYPE_ONCAPTION 2
701 #define TYPE_ONCAPTIONINFO 3
702 #define TYPE_UNKNOWN 9
703
flv_read_metabody(AVFormatContext * s,int64_t next_pos)704 static int flv_read_metabody(AVFormatContext *s, int64_t next_pos)
705 {
706 FLVContext *flv = s->priv_data;
707 AMFDataType type;
708 AVStream *stream, *astream, *vstream;
709 AVStream av_unused *dstream;
710 AVIOContext *ioc;
711 int i;
712 char buffer[32];
713
714 astream = NULL;
715 vstream = NULL;
716 dstream = NULL;
717 ioc = s->pb;
718
719 // first object needs to be "onMetaData" string
720 type = avio_r8(ioc);
721 if (type != AMF_DATA_TYPE_STRING ||
722 amf_get_string(ioc, buffer, sizeof(buffer)) < 0)
723 return TYPE_UNKNOWN;
724
725 if (!strcmp(buffer, "onTextData"))
726 return TYPE_ONTEXTDATA;
727
728 if (!strcmp(buffer, "onCaption"))
729 return TYPE_ONCAPTION;
730
731 if (!strcmp(buffer, "onCaptionInfo"))
732 return TYPE_ONCAPTIONINFO;
733
734 if (strcmp(buffer, "onMetaData") && strcmp(buffer, "onCuePoint") && strcmp(buffer, "|RtmpSampleAccess")) {
735 av_log(s, AV_LOG_DEBUG, "Unknown type %s\n", buffer);
736 return TYPE_UNKNOWN;
737 }
738
739 // find the streams now so that amf_parse_object doesn't need to do
740 // the lookup every time it is called.
741 for (i = 0; i < s->nb_streams; i++) {
742 stream = s->streams[i];
743 if (stream->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
744 vstream = stream;
745 flv->last_keyframe_stream_index = i;
746 } else if (stream->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
747 astream = stream;
748 if (flv->last_keyframe_stream_index == -1)
749 flv->last_keyframe_stream_index = i;
750 } else if (stream->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE)
751 dstream = stream;
752 }
753
754 // parse the second object (we want a mixed array)
755 if (amf_parse_object(s, astream, vstream, buffer, next_pos, 0) < 0)
756 return -1;
757
758 return 0;
759 }
760
flv_read_header(AVFormatContext * s)761 static int flv_read_header(AVFormatContext *s)
762 {
763 int flags;
764 FLVContext *flv = s->priv_data;
765 int offset;
766 int pre_tag_size = 0;
767
768 /* Actual FLV data at 0xe40000 in KUX file */
769 if(!strcmp(s->iformat->name, "kux"))
770 avio_skip(s->pb, 0xe40000);
771
772 avio_skip(s->pb, 4);
773 flags = avio_r8(s->pb);
774
775 flv->missing_streams = flags & (FLV_HEADER_FLAG_HASVIDEO | FLV_HEADER_FLAG_HASAUDIO);
776
777 s->ctx_flags |= AVFMTCTX_NOHEADER;
778
779 offset = avio_rb32(s->pb);
780 avio_seek(s->pb, offset, SEEK_SET);
781
782 /* Annex E. The FLV File Format
783 * E.3 TheFLVFileBody
784 * Field Type Comment
785 * PreviousTagSize0 UI32 Always 0
786 * */
787 pre_tag_size = avio_rb32(s->pb);
788 if (pre_tag_size) {
789 av_log(s, AV_LOG_WARNING, "Read FLV header error, input file is not a standard flv format, first PreviousTagSize0 always is 0\n");
790 }
791
792 s->start_time = 0;
793 flv->sum_flv_tag_size = 0;
794 flv->last_keyframe_stream_index = -1;
795
796 return 0;
797 }
798
flv_read_close(AVFormatContext * s)799 static int flv_read_close(AVFormatContext *s)
800 {
801 int i;
802 FLVContext *flv = s->priv_data;
803 for (i=0; i<FLV_STREAM_TYPE_NB; i++)
804 av_freep(&flv->new_extradata[i]);
805 av_freep(&flv->keyframe_times);
806 av_freep(&flv->keyframe_filepositions);
807 return 0;
808 }
809
flv_get_extradata(AVFormatContext * s,AVStream * st,int size)810 static int flv_get_extradata(AVFormatContext *s, AVStream *st, int size)
811 {
812 int ret;
813 if (!size)
814 return 0;
815
816 if ((ret = ff_get_extradata(s, st->codecpar, s->pb, size)) < 0)
817 return ret;
818 st->internal->need_context_update = 1;
819 return 0;
820 }
821
flv_queue_extradata(FLVContext * flv,AVIOContext * pb,int stream,int size)822 static int flv_queue_extradata(FLVContext *flv, AVIOContext *pb, int stream,
823 int size)
824 {
825 if (!size)
826 return 0;
827
828 av_free(flv->new_extradata[stream]);
829 flv->new_extradata[stream] = av_mallocz(size +
830 AV_INPUT_BUFFER_PADDING_SIZE);
831 if (!flv->new_extradata[stream])
832 return AVERROR(ENOMEM);
833 flv->new_extradata_size[stream] = size;
834 avio_read(pb, flv->new_extradata[stream], size);
835 return 0;
836 }
837
clear_index_entries(AVFormatContext * s,int64_t pos)838 static void clear_index_entries(AVFormatContext *s, int64_t pos)
839 {
840 int i, j, out;
841 av_log(s, AV_LOG_WARNING,
842 "Found invalid index entries, clearing the index.\n");
843 for (i = 0; i < s->nb_streams; i++) {
844 AVStream *st = s->streams[i];
845 /* Remove all index entries that point to >= pos */
846 out = 0;
847 for (j = 0; j < st->nb_index_entries; j++)
848 if (st->index_entries[j].pos < pos)
849 st->index_entries[out++] = st->index_entries[j];
850 st->nb_index_entries = out;
851 }
852 }
853
amf_skip_tag(AVIOContext * pb,AMFDataType type,int depth)854 static int amf_skip_tag(AVIOContext *pb, AMFDataType type, int depth)
855 {
856 int nb = -1, ret, parse_name = 1;
857
858 if (depth > MAX_DEPTH)
859 return AVERROR_PATCHWELCOME;
860
861 if (avio_feof(pb))
862 return AVERROR_EOF;
863
864 switch (type) {
865 case AMF_DATA_TYPE_NUMBER:
866 avio_skip(pb, 8);
867 break;
868 case AMF_DATA_TYPE_BOOL:
869 avio_skip(pb, 1);
870 break;
871 case AMF_DATA_TYPE_STRING:
872 avio_skip(pb, avio_rb16(pb));
873 break;
874 case AMF_DATA_TYPE_ARRAY:
875 parse_name = 0;
876 case AMF_DATA_TYPE_MIXEDARRAY:
877 nb = avio_rb32(pb);
878 if (nb < 0)
879 return AVERROR_INVALIDDATA;
880 case AMF_DATA_TYPE_OBJECT:
881 while(!pb->eof_reached && (nb-- > 0 || type != AMF_DATA_TYPE_ARRAY)) {
882 if (parse_name) {
883 int size = avio_rb16(pb);
884 if (!size) {
885 avio_skip(pb, 1);
886 break;
887 }
888 avio_skip(pb, size);
889 }
890 if ((ret = amf_skip_tag(pb, avio_r8(pb), depth + 1)) < 0)
891 return ret;
892 }
893 break;
894 case AMF_DATA_TYPE_NULL:
895 case AMF_DATA_TYPE_OBJECT_END:
896 break;
897 default:
898 return AVERROR_INVALIDDATA;
899 }
900 return 0;
901 }
902
flv_data_packet(AVFormatContext * s,AVPacket * pkt,int64_t dts,int64_t next)903 static int flv_data_packet(AVFormatContext *s, AVPacket *pkt,
904 int64_t dts, int64_t next)
905 {
906 AVIOContext *pb = s->pb;
907 AVStream *st = NULL;
908 char buf[20];
909 int ret = AVERROR_INVALIDDATA;
910 int i, length = -1;
911 int array = 0;
912
913 switch (avio_r8(pb)) {
914 case AMF_DATA_TYPE_ARRAY:
915 array = 1;
916 case AMF_DATA_TYPE_MIXEDARRAY:
917 avio_seek(pb, 4, SEEK_CUR);
918 case AMF_DATA_TYPE_OBJECT:
919 break;
920 default:
921 goto skip;
922 }
923
924 while (array || (ret = amf_get_string(pb, buf, sizeof(buf))) > 0) {
925 AMFDataType type = avio_r8(pb);
926 if (type == AMF_DATA_TYPE_STRING && (array || !strcmp(buf, "text"))) {
927 length = avio_rb16(pb);
928 ret = av_get_packet(pb, pkt, length);
929 if (ret < 0)
930 goto skip;
931 else
932 break;
933 } else {
934 if ((ret = amf_skip_tag(pb, type, 0)) < 0)
935 goto skip;
936 }
937 }
938
939 if (length < 0) {
940 ret = AVERROR_INVALIDDATA;
941 goto skip;
942 }
943
944 for (i = 0; i < s->nb_streams; i++) {
945 st = s->streams[i];
946 if (st->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE)
947 break;
948 }
949
950 if (i == s->nb_streams) {
951 st = create_stream(s, AVMEDIA_TYPE_SUBTITLE);
952 if (!st)
953 return AVERROR(ENOMEM);
954 st->codecpar->codec_id = AV_CODEC_ID_TEXT;
955 }
956
957 pkt->dts = dts;
958 pkt->pts = dts;
959 pkt->size = ret;
960
961 pkt->stream_index = st->index;
962 pkt->flags |= AV_PKT_FLAG_KEY;
963
964 skip:
965 avio_seek(s->pb, next + 4, SEEK_SET);
966
967 return ret;
968 }
969
resync(AVFormatContext * s)970 static int resync(AVFormatContext *s)
971 {
972 FLVContext *flv = s->priv_data;
973 int64_t i;
974 int64_t pos = avio_tell(s->pb);
975
976 for (i=0; !avio_feof(s->pb); i++) {
977 int j = i & (RESYNC_BUFFER_SIZE-1);
978 int j1 = j + RESYNC_BUFFER_SIZE;
979 flv->resync_buffer[j ] =
980 flv->resync_buffer[j1] = avio_r8(s->pb);
981
982 if (i >= 8 && pos) {
983 uint8_t *d = flv->resync_buffer + j1 - 8;
984 if (d[0] == 'F' &&
985 d[1] == 'L' &&
986 d[2] == 'V' &&
987 d[3] < 5 && d[5] == 0) {
988 av_log(s, AV_LOG_WARNING, "Concatenated FLV detected, might fail to demux, decode and seek %"PRId64"\n", flv->last_ts);
989 flv->time_offset = flv->last_ts + 1;
990 flv->time_pos = avio_tell(s->pb);
991 }
992 }
993
994 if (i > 22) {
995 unsigned lsize2 = AV_RB32(flv->resync_buffer + j1 - 4);
996 if (lsize2 >= 11 && lsize2 + 8LL < FFMIN(i, RESYNC_BUFFER_SIZE)) {
997 unsigned size2 = AV_RB24(flv->resync_buffer + j1 - lsize2 + 1 - 4);
998 unsigned lsize1 = AV_RB32(flv->resync_buffer + j1 - lsize2 - 8);
999 if (lsize1 >= 11 && lsize1 + 8LL + lsize2 < FFMIN(i, RESYNC_BUFFER_SIZE)) {
1000 unsigned size1 = AV_RB24(flv->resync_buffer + j1 - lsize1 + 1 - lsize2 - 8);
1001 if (size1 == lsize1 - 11 && size2 == lsize2 - 11) {
1002 avio_seek(s->pb, pos + i - lsize1 - lsize2 - 8, SEEK_SET);
1003 return 1;
1004 }
1005 }
1006 }
1007 }
1008 }
1009 return AVERROR_EOF;
1010 }
1011
flv_read_packet(AVFormatContext * s,AVPacket * pkt)1012 static int flv_read_packet(AVFormatContext *s, AVPacket *pkt)
1013 {
1014 FLVContext *flv = s->priv_data;
1015 int ret, i, size, flags;
1016 enum FlvTagType type;
1017 int stream_type=-1;
1018 int64_t next, pos, meta_pos;
1019 int64_t dts, pts = AV_NOPTS_VALUE;
1020 int av_uninit(channels);
1021 int av_uninit(sample_rate);
1022 AVStream *st = NULL;
1023 int last = -1;
1024 int orig_size;
1025
1026 retry:
1027 /* pkt size is repeated at end. skip it */
1028 pos = avio_tell(s->pb);
1029 type = (avio_r8(s->pb) & 0x1F);
1030 orig_size =
1031 size = avio_rb24(s->pb);
1032 flv->sum_flv_tag_size += size + 11;
1033 dts = avio_rb24(s->pb);
1034 dts |= (unsigned)avio_r8(s->pb) << 24;
1035 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));
1036 if (avio_feof(s->pb))
1037 return AVERROR_EOF;
1038 avio_skip(s->pb, 3); /* stream id, always 0 */
1039 flags = 0;
1040
1041 if (flv->validate_next < flv->validate_count) {
1042 int64_t validate_pos = flv->validate_index[flv->validate_next].pos;
1043 if (pos == validate_pos) {
1044 if (FFABS(dts - flv->validate_index[flv->validate_next].dts) <=
1045 VALIDATE_INDEX_TS_THRESH) {
1046 flv->validate_next++;
1047 } else {
1048 clear_index_entries(s, validate_pos);
1049 flv->validate_count = 0;
1050 }
1051 } else if (pos > validate_pos) {
1052 clear_index_entries(s, validate_pos);
1053 flv->validate_count = 0;
1054 }
1055 }
1056
1057 if (size == 0) {
1058 ret = FFERROR_REDO;
1059 goto leave;
1060 }
1061
1062 next = size + avio_tell(s->pb);
1063
1064 if (type == FLV_TAG_TYPE_AUDIO) {
1065 stream_type = FLV_STREAM_TYPE_AUDIO;
1066 flags = avio_r8(s->pb);
1067 size--;
1068 } else if (type == FLV_TAG_TYPE_VIDEO) {
1069 stream_type = FLV_STREAM_TYPE_VIDEO;
1070 flags = avio_r8(s->pb);
1071 size--;
1072 if ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_VIDEO_INFO_CMD)
1073 goto skip;
1074 } else if (type == FLV_TAG_TYPE_META) {
1075 stream_type=FLV_STREAM_TYPE_SUBTITLE;
1076 if (size > 13 + 1 + 4) { // Header-type metadata stuff
1077 int type;
1078 meta_pos = avio_tell(s->pb);
1079 type = flv_read_metabody(s, next);
1080 if (type == 0 && dts == 0 || type < 0) {
1081 if (type < 0 && flv->validate_count &&
1082 flv->validate_index[0].pos > next &&
1083 flv->validate_index[0].pos - 4 < next) {
1084 av_log(s, AV_LOG_WARNING, "Adjusting next position due to index mismatch\n");
1085 next = flv->validate_index[0].pos - 4;
1086 }
1087 goto skip;
1088 } else if (type == TYPE_ONTEXTDATA) {
1089 avpriv_request_sample(s, "OnTextData packet");
1090 return flv_data_packet(s, pkt, dts, next);
1091 } else if (type == TYPE_ONCAPTION) {
1092 return flv_data_packet(s, pkt, dts, next);
1093 } else if (type == TYPE_UNKNOWN) {
1094 stream_type = FLV_STREAM_TYPE_DATA;
1095 }
1096 avio_seek(s->pb, meta_pos, SEEK_SET);
1097 }
1098 } else {
1099 av_log(s, AV_LOG_DEBUG,
1100 "Skipping flv packet: type %d, size %d, flags %d.\n",
1101 type, size, flags);
1102 skip:
1103 if (avio_seek(s->pb, next, SEEK_SET) != next) {
1104 // This can happen if flv_read_metabody above read past
1105 // next, on a non-seekable input, and the preceding data has
1106 // been flushed out from the IO buffer.
1107 av_log(s, AV_LOG_ERROR, "Unable to seek to the next packet\n");
1108 return AVERROR_INVALIDDATA;
1109 }
1110 ret = FFERROR_REDO;
1111 goto leave;
1112 }
1113
1114 /* skip empty data packets */
1115 if (!size) {
1116 ret = FFERROR_REDO;
1117 goto leave;
1118 }
1119
1120 /* now find stream */
1121 for (i = 0; i < s->nb_streams; i++) {
1122 st = s->streams[i];
1123 if (stream_type == FLV_STREAM_TYPE_AUDIO) {
1124 if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO &&
1125 (s->audio_codec_id || flv_same_audio_codec(st->codecpar, flags)))
1126 break;
1127 } else if (stream_type == FLV_STREAM_TYPE_VIDEO) {
1128 if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO &&
1129 (s->video_codec_id || flv_same_video_codec(st->codecpar, flags)))
1130 break;
1131 } else if (stream_type == FLV_STREAM_TYPE_SUBTITLE) {
1132 if (st->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE)
1133 break;
1134 } else if (stream_type == FLV_STREAM_TYPE_DATA) {
1135 if (st->codecpar->codec_type == AVMEDIA_TYPE_DATA)
1136 break;
1137 }
1138 }
1139 if (i == s->nb_streams) {
1140 static const enum AVMediaType stream_types[] = {AVMEDIA_TYPE_VIDEO, AVMEDIA_TYPE_AUDIO, AVMEDIA_TYPE_SUBTITLE, AVMEDIA_TYPE_DATA};
1141 st = create_stream(s, stream_types[stream_type]);
1142 if (!st)
1143 return AVERROR(ENOMEM);
1144 }
1145 av_log(s, AV_LOG_TRACE, "%d %X %d \n", stream_type, flags, st->discard);
1146
1147 if (flv->time_pos <= pos) {
1148 dts += flv->time_offset;
1149 }
1150
1151 if ((s->pb->seekable & AVIO_SEEKABLE_NORMAL) &&
1152 ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY ||
1153 stream_type == FLV_STREAM_TYPE_AUDIO))
1154 av_add_index_entry(st, pos, dts, size, 0, AVINDEX_KEYFRAME);
1155
1156 if ((st->discard >= AVDISCARD_NONKEY && !((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY || stream_type == FLV_STREAM_TYPE_AUDIO)) ||
1157 (st->discard >= AVDISCARD_BIDIR && ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_DISP_INTER && stream_type == FLV_STREAM_TYPE_VIDEO)) ||
1158 st->discard >= AVDISCARD_ALL) {
1159 avio_seek(s->pb, next, SEEK_SET);
1160 ret = FFERROR_REDO;
1161 goto leave;
1162 }
1163
1164 // if not streamed and no duration from metadata then seek to end to find
1165 // the duration from the timestamps
1166 if ((s->pb->seekable & AVIO_SEEKABLE_NORMAL) &&
1167 (!s->duration || s->duration == AV_NOPTS_VALUE) &&
1168 !flv->searched_for_end) {
1169 int size;
1170 const int64_t pos = avio_tell(s->pb);
1171 // Read the last 4 bytes of the file, this should be the size of the
1172 // previous FLV tag. Use the timestamp of its payload as duration.
1173 int64_t fsize = avio_size(s->pb);
1174 retry_duration:
1175 avio_seek(s->pb, fsize - 4, SEEK_SET);
1176 size = avio_rb32(s->pb);
1177 if (size > 0 && size < fsize) {
1178 // Seek to the start of the last FLV tag at position (fsize - 4 - size)
1179 // but skip the byte indicating the type.
1180 avio_seek(s->pb, fsize - 3 - size, SEEK_SET);
1181 if (size == avio_rb24(s->pb) + 11) {
1182 uint32_t ts = avio_rb24(s->pb);
1183 ts |= (unsigned)avio_r8(s->pb) << 24;
1184 if (ts)
1185 s->duration = ts * (int64_t)AV_TIME_BASE / 1000;
1186 else if (fsize >= 8 && fsize - 8 >= size) {
1187 fsize -= size+4;
1188 goto retry_duration;
1189 }
1190 }
1191 }
1192
1193 avio_seek(s->pb, pos, SEEK_SET);
1194 flv->searched_for_end = 1;
1195 }
1196
1197 if (stream_type == FLV_STREAM_TYPE_AUDIO) {
1198 int bits_per_coded_sample;
1199 channels = (flags & FLV_AUDIO_CHANNEL_MASK) == FLV_STEREO ? 2 : 1;
1200 sample_rate = 44100 << ((flags & FLV_AUDIO_SAMPLERATE_MASK) >>
1201 FLV_AUDIO_SAMPLERATE_OFFSET) >> 3;
1202 bits_per_coded_sample = (flags & FLV_AUDIO_SAMPLESIZE_MASK) ? 16 : 8;
1203 if (!st->codecpar->channels || !st->codecpar->sample_rate ||
1204 !st->codecpar->bits_per_coded_sample) {
1205 st->codecpar->channels = channels;
1206 st->codecpar->channel_layout = channels == 1
1207 ? AV_CH_LAYOUT_MONO
1208 : AV_CH_LAYOUT_STEREO;
1209 st->codecpar->sample_rate = sample_rate;
1210 st->codecpar->bits_per_coded_sample = bits_per_coded_sample;
1211 }
1212 if (!st->codecpar->codec_id) {
1213 flv_set_audio_codec(s, st, st->codecpar,
1214 flags & FLV_AUDIO_CODECID_MASK);
1215 flv->last_sample_rate =
1216 sample_rate = st->codecpar->sample_rate;
1217 flv->last_channels =
1218 channels = st->codecpar->channels;
1219 } else {
1220 AVCodecParameters *par = avcodec_parameters_alloc();
1221 if (!par) {
1222 ret = AVERROR(ENOMEM);
1223 goto leave;
1224 }
1225 par->sample_rate = sample_rate;
1226 par->bits_per_coded_sample = bits_per_coded_sample;
1227 flv_set_audio_codec(s, st, par, flags & FLV_AUDIO_CODECID_MASK);
1228 sample_rate = par->sample_rate;
1229 avcodec_parameters_free(&par);
1230 }
1231 } else if (stream_type == FLV_STREAM_TYPE_VIDEO) {
1232 int ret = flv_set_video_codec(s, st, flags & FLV_VIDEO_CODECID_MASK, 1);
1233 if (ret < 0)
1234 return ret;
1235 size -= ret;
1236 } else if (stream_type == FLV_STREAM_TYPE_SUBTITLE) {
1237 st->codecpar->codec_id = AV_CODEC_ID_TEXT;
1238 } else if (stream_type == FLV_STREAM_TYPE_DATA) {
1239 st->codecpar->codec_id = AV_CODEC_ID_NONE; // Opaque AMF data
1240 }
1241
1242 if (st->codecpar->codec_id == AV_CODEC_ID_AAC ||
1243 st->codecpar->codec_id == AV_CODEC_ID_H264 ||
1244 st->codecpar->codec_id == AV_CODEC_ID_MPEG4) {
1245 int type = avio_r8(s->pb);
1246 size--;
1247
1248 if (size < 0) {
1249 ret = AVERROR_INVALIDDATA;
1250 goto leave;
1251 }
1252
1253 if (st->codecpar->codec_id == AV_CODEC_ID_H264 || st->codecpar->codec_id == AV_CODEC_ID_MPEG4) {
1254 // sign extension
1255 int32_t cts = (avio_rb24(s->pb) + 0xff800000) ^ 0xff800000;
1256 pts = av_sat_add64(dts, cts);
1257 if (cts < 0) { // dts might be wrong
1258 if (!flv->wrong_dts)
1259 av_log(s, AV_LOG_WARNING,
1260 "Negative cts, previous timestamps might be wrong.\n");
1261 flv->wrong_dts = 1;
1262 } else if (FFABS(dts - pts) > 1000*60*15) {
1263 av_log(s, AV_LOG_WARNING,
1264 "invalid timestamps %"PRId64" %"PRId64"\n", dts, pts);
1265 dts = pts = AV_NOPTS_VALUE;
1266 }
1267 }
1268 if (type == 0 && (!st->codecpar->extradata || st->codecpar->codec_id == AV_CODEC_ID_AAC ||
1269 st->codecpar->codec_id == AV_CODEC_ID_H264)) {
1270 AVDictionaryEntry *t;
1271
1272 if (st->codecpar->extradata) {
1273 if ((ret = flv_queue_extradata(flv, s->pb, stream_type, size)) < 0)
1274 return ret;
1275 ret = FFERROR_REDO;
1276 goto leave;
1277 }
1278 if ((ret = flv_get_extradata(s, st, size)) < 0)
1279 return ret;
1280
1281 /* Workaround for buggy Omnia A/XE encoder */
1282 t = av_dict_get(s->metadata, "Encoder", NULL, 0);
1283 if (st->codecpar->codec_id == AV_CODEC_ID_AAC && t && !strcmp(t->value, "Omnia A/XE"))
1284 st->codecpar->extradata_size = 2;
1285
1286 ret = FFERROR_REDO;
1287 goto leave;
1288 }
1289 }
1290
1291 /* skip empty data packets */
1292 if (!size) {
1293 ret = FFERROR_REDO;
1294 goto leave;
1295 }
1296
1297 ret = av_get_packet(s->pb, pkt, size);
1298 if (ret < 0)
1299 return ret;
1300 pkt->dts = dts;
1301 pkt->pts = pts == AV_NOPTS_VALUE ? dts : pts;
1302 pkt->stream_index = st->index;
1303 pkt->pos = pos;
1304 if (flv->new_extradata[stream_type]) {
1305 int ret = av_packet_add_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA,
1306 flv->new_extradata[stream_type],
1307 flv->new_extradata_size[stream_type]);
1308 if (ret >= 0) {
1309 flv->new_extradata[stream_type] = NULL;
1310 flv->new_extradata_size[stream_type] = 0;
1311 }
1312 }
1313 if (stream_type == FLV_STREAM_TYPE_AUDIO &&
1314 (sample_rate != flv->last_sample_rate ||
1315 channels != flv->last_channels)) {
1316 flv->last_sample_rate = sample_rate;
1317 flv->last_channels = channels;
1318 ff_add_param_change(pkt, channels, 0, sample_rate, 0, 0);
1319 }
1320
1321 if (stream_type == FLV_STREAM_TYPE_AUDIO ||
1322 (flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY ||
1323 stream_type == FLV_STREAM_TYPE_SUBTITLE ||
1324 stream_type == FLV_STREAM_TYPE_DATA)
1325 pkt->flags |= AV_PKT_FLAG_KEY;
1326
1327 leave:
1328 last = avio_rb32(s->pb);
1329 if (!flv->trust_datasize) {
1330 if (last != orig_size + 11 && last != orig_size + 10 &&
1331 !avio_feof(s->pb) &&
1332 (last != orig_size || !last) && last != flv->sum_flv_tag_size &&
1333 !flv->broken_sizes) {
1334 av_log(s, AV_LOG_ERROR, "Packet mismatch %d %d %d\n", last, orig_size + 11, flv->sum_flv_tag_size);
1335 avio_seek(s->pb, pos + 1, SEEK_SET);
1336 ret = resync(s);
1337 av_packet_unref(pkt);
1338 if (ret >= 0) {
1339 goto retry;
1340 }
1341 }
1342 }
1343
1344 if (ret >= 0)
1345 flv->last_ts = pkt->dts;
1346
1347 return ret;
1348 }
1349
flv_read_seek(AVFormatContext * s,int stream_index,int64_t ts,int flags)1350 static int flv_read_seek(AVFormatContext *s, int stream_index,
1351 int64_t ts, int flags)
1352 {
1353 FLVContext *flv = s->priv_data;
1354 flv->validate_count = 0;
1355 return avio_seek_time(s->pb, stream_index, ts, flags);
1356 }
1357
1358 #define OFFSET(x) offsetof(FLVContext, x)
1359 #define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM
1360 static const AVOption options[] = {
1361 { "flv_metadata", "Allocate streams according to the onMetaData array", OFFSET(trust_metadata), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, VD },
1362 { "flv_full_metadata", "Dump full metadata of the onMetadata", OFFSET(dump_full_metadata), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, VD },
1363 { "flv_ignore_prevtag", "Ignore the Size of previous tag", OFFSET(trust_datasize), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, VD },
1364 { "missing_streams", "", OFFSET(missing_streams), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 0xFF, VD | AV_OPT_FLAG_EXPORT | AV_OPT_FLAG_READONLY },
1365 { NULL }
1366 };
1367
1368 static const AVClass flv_class = {
1369 .class_name = "flvdec",
1370 .item_name = av_default_item_name,
1371 .option = options,
1372 .version = LIBAVUTIL_VERSION_INT,
1373 };
1374
1375 AVInputFormat ff_flv_demuxer = {
1376 .name = "flv",
1377 .long_name = NULL_IF_CONFIG_SMALL("FLV (Flash Video)"),
1378 .priv_data_size = sizeof(FLVContext),
1379 .read_probe = flv_probe,
1380 .read_header = flv_read_header,
1381 .read_packet = flv_read_packet,
1382 .read_seek = flv_read_seek,
1383 .read_close = flv_read_close,
1384 .extensions = "flv",
1385 .priv_class = &flv_class,
1386 };
1387
1388 static const AVClass live_flv_class = {
1389 .class_name = "live_flvdec",
1390 .item_name = av_default_item_name,
1391 .option = options,
1392 .version = LIBAVUTIL_VERSION_INT,
1393 };
1394
1395 AVInputFormat ff_live_flv_demuxer = {
1396 .name = "live_flv",
1397 .long_name = NULL_IF_CONFIG_SMALL("live RTMP FLV (Flash Video)"),
1398 .priv_data_size = sizeof(FLVContext),
1399 .read_probe = live_flv_probe,
1400 .read_header = flv_read_header,
1401 .read_packet = flv_read_packet,
1402 .read_seek = flv_read_seek,
1403 .read_close = flv_read_close,
1404 .extensions = "flv",
1405 .priv_class = &live_flv_class,
1406 .flags = AVFMT_TS_DISCONT
1407 };
1408
1409 static const AVClass kux_class = {
1410 .class_name = "kuxdec",
1411 .item_name = av_default_item_name,
1412 .option = options,
1413 .version = LIBAVUTIL_VERSION_INT,
1414 };
1415
1416 AVInputFormat ff_kux_demuxer = {
1417 .name = "kux",
1418 .long_name = NULL_IF_CONFIG_SMALL("KUX (YouKu)"),
1419 .priv_data_size = sizeof(FLVContext),
1420 .read_probe = kux_probe,
1421 .read_header = flv_read_header,
1422 .read_packet = flv_read_packet,
1423 .read_seek = flv_read_seek,
1424 .read_close = flv_read_close,
1425 .extensions = "kux",
1426 .priv_class = &kux_class,
1427 };
1428