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 if (avio_r8(ioc) != AMF_DATA_TYPE_NUMBER)
457 goto invalid;
458 current_array[0][i] = av_int2double(avio_rb64(ioc));
459 }
460 if (times && filepositions) {
461 // All done, exiting at a position allowing amf_parse_object
462 // to finish parsing the object
463 ret = 0;
464 break;
465 }
466 }
467
468 if (timeslen == fileposlen && fileposlen>1 && max_pos <= filepositions[0]) {
469 for (i = 0; i < FFMIN(2,fileposlen); i++) {
470 flv->validate_index[i].pos = filepositions[i];
471 flv->validate_index[i].dts = times[i] * 1000;
472 flv->validate_count = i + 1;
473 }
474 flv->keyframe_times = times;
475 flv->keyframe_filepositions = filepositions;
476 flv->keyframe_count = timeslen;
477 times = NULL;
478 filepositions = NULL;
479 } else {
480 invalid:
481 av_log(s, AV_LOG_WARNING, "Invalid keyframes object, skipping.\n");
482 }
483
484 finish:
485 av_freep(×);
486 av_freep(&filepositions);
487 avio_seek(ioc, initial_pos, SEEK_SET);
488 return ret;
489 }
490
amf_parse_object(AVFormatContext * s,AVStream * astream,AVStream * vstream,const char * key,int64_t max_pos,int depth)491 static int amf_parse_object(AVFormatContext *s, AVStream *astream,
492 AVStream *vstream, const char *key,
493 int64_t max_pos, int depth)
494 {
495 AVCodecParameters *apar, *vpar;
496 FLVContext *flv = s->priv_data;
497 AVIOContext *ioc;
498 AMFDataType amf_type;
499 char str_val[1024];
500 double num_val;
501 amf_date date;
502
503 if (depth > MAX_DEPTH)
504 return AVERROR_PATCHWELCOME;
505
506 num_val = 0;
507 ioc = s->pb;
508 if (avio_feof(ioc))
509 return AVERROR_EOF;
510 amf_type = avio_r8(ioc);
511
512 switch (amf_type) {
513 case AMF_DATA_TYPE_NUMBER:
514 num_val = av_int2double(avio_rb64(ioc));
515 break;
516 case AMF_DATA_TYPE_BOOL:
517 num_val = avio_r8(ioc);
518 break;
519 case AMF_DATA_TYPE_STRING:
520 if (amf_get_string(ioc, str_val, sizeof(str_val)) < 0) {
521 av_log(s, AV_LOG_ERROR, "AMF_DATA_TYPE_STRING parsing failed\n");
522 return -1;
523 }
524 break;
525 case AMF_DATA_TYPE_OBJECT:
526 if (key &&
527 (ioc->seekable & AVIO_SEEKABLE_NORMAL) &&
528 !strcmp(KEYFRAMES_TAG, key) && depth == 1)
529 if (parse_keyframes_index(s, ioc,
530 max_pos) < 0)
531 av_log(s, AV_LOG_ERROR, "Keyframe index parsing failed\n");
532 else
533 add_keyframes_index(s);
534 while (avio_tell(ioc) < max_pos - 2 &&
535 amf_get_string(ioc, str_val, sizeof(str_val)) > 0)
536 if (amf_parse_object(s, astream, vstream, str_val, max_pos,
537 depth + 1) < 0)
538 return -1; // if we couldn't skip, bomb out.
539 if (avio_r8(ioc) != AMF_END_OF_OBJECT) {
540 av_log(s, AV_LOG_ERROR, "Missing AMF_END_OF_OBJECT in AMF_DATA_TYPE_OBJECT\n");
541 return -1;
542 }
543 break;
544 case AMF_DATA_TYPE_NULL:
545 case AMF_DATA_TYPE_UNDEFINED:
546 case AMF_DATA_TYPE_UNSUPPORTED:
547 break; // these take up no additional space
548 case AMF_DATA_TYPE_MIXEDARRAY:
549 {
550 unsigned v;
551 avio_skip(ioc, 4); // skip 32-bit max array index
552 while (avio_tell(ioc) < max_pos - 2 &&
553 amf_get_string(ioc, str_val, sizeof(str_val)) > 0)
554 // this is the only case in which we would want a nested
555 // parse to not skip over the object
556 if (amf_parse_object(s, astream, vstream, str_val, max_pos,
557 depth + 1) < 0)
558 return -1;
559 v = avio_r8(ioc);
560 if (v != AMF_END_OF_OBJECT) {
561 av_log(s, AV_LOG_ERROR, "Missing AMF_END_OF_OBJECT in AMF_DATA_TYPE_MIXEDARRAY, found %d\n", v);
562 return -1;
563 }
564 break;
565 }
566 case AMF_DATA_TYPE_ARRAY:
567 {
568 unsigned int arraylen, i;
569
570 arraylen = avio_rb32(ioc);
571 for (i = 0; i < arraylen && avio_tell(ioc) < max_pos - 1; i++)
572 if (amf_parse_object(s, NULL, NULL, NULL, max_pos,
573 depth + 1) < 0)
574 return -1; // if we couldn't skip, bomb out.
575 }
576 break;
577 case AMF_DATA_TYPE_DATE:
578 // timestamp (double) and UTC offset (int16)
579 date.milliseconds = av_int2double(avio_rb64(ioc));
580 date.timezone = avio_rb16(ioc);
581 break;
582 default: // unsupported type, we couldn't skip
583 av_log(s, AV_LOG_ERROR, "unsupported amf type %d\n", amf_type);
584 return -1;
585 }
586
587 if (key) {
588 apar = astream ? astream->codecpar : NULL;
589 vpar = vstream ? vstream->codecpar : NULL;
590
591 // stream info doesn't live any deeper than the first object
592 if (depth == 1) {
593 if (amf_type == AMF_DATA_TYPE_NUMBER ||
594 amf_type == AMF_DATA_TYPE_BOOL) {
595 if (!strcmp(key, "duration"))
596 s->duration = num_val * AV_TIME_BASE;
597 else if (!strcmp(key, "videodatarate") &&
598 0 <= (int)(num_val * 1024.0))
599 flv->video_bit_rate = num_val * 1024.0;
600 else if (!strcmp(key, "audiodatarate") &&
601 0 <= (int)(num_val * 1024.0))
602 flv->audio_bit_rate = num_val * 1024.0;
603 else if (!strcmp(key, "datastream")) {
604 AVStream *st = create_stream(s, AVMEDIA_TYPE_SUBTITLE);
605 if (!st)
606 return AVERROR(ENOMEM);
607 st->codecpar->codec_id = AV_CODEC_ID_TEXT;
608 } else if (!strcmp(key, "framerate")) {
609 flv->framerate = av_d2q(num_val, 1000);
610 if (vstream)
611 vstream->avg_frame_rate = flv->framerate;
612 } else if (flv->trust_metadata) {
613 if (!strcmp(key, "videocodecid") && vpar) {
614 int ret = flv_set_video_codec(s, vstream, num_val, 0);
615 if (ret < 0)
616 return ret;
617 } else if (!strcmp(key, "audiocodecid") && apar) {
618 int id = ((int)num_val) << FLV_AUDIO_CODECID_OFFSET;
619 flv_set_audio_codec(s, astream, apar, id);
620 } else if (!strcmp(key, "audiosamplerate") && apar) {
621 apar->sample_rate = num_val;
622 } else if (!strcmp(key, "audiosamplesize") && apar) {
623 apar->bits_per_coded_sample = num_val;
624 } else if (!strcmp(key, "stereo") && apar) {
625 apar->channels = num_val + 1;
626 apar->channel_layout = apar->channels == 2 ?
627 AV_CH_LAYOUT_STEREO :
628 AV_CH_LAYOUT_MONO;
629 } else if (!strcmp(key, "width") && vpar) {
630 vpar->width = num_val;
631 } else if (!strcmp(key, "height") && vpar) {
632 vpar->height = num_val;
633 }
634 }
635 }
636 if (amf_type == AMF_DATA_TYPE_STRING) {
637 if (!strcmp(key, "encoder")) {
638 int version = -1;
639 if (1 == sscanf(str_val, "Open Broadcaster Software v0.%d", &version)) {
640 if (version > 0 && version <= 655)
641 flv->broken_sizes = 1;
642 }
643 } else if (!strcmp(key, "metadatacreator")) {
644 if ( !strcmp (str_val, "MEGA")
645 || !strncmp(str_val, "FlixEngine", 10))
646 flv->broken_sizes = 1;
647 }
648 }
649 }
650
651 if (amf_type == AMF_DATA_TYPE_OBJECT && s->nb_streams == 1 &&
652 ((!apar && !strcmp(key, "audiocodecid")) ||
653 (!vpar && !strcmp(key, "videocodecid"))))
654 s->ctx_flags &= ~AVFMTCTX_NOHEADER; //If there is either audio/video missing, codecid will be an empty object
655
656 if ((!strcmp(key, "duration") ||
657 !strcmp(key, "filesize") ||
658 !strcmp(key, "width") ||
659 !strcmp(key, "height") ||
660 !strcmp(key, "videodatarate") ||
661 !strcmp(key, "framerate") ||
662 !strcmp(key, "videocodecid") ||
663 !strcmp(key, "audiodatarate") ||
664 !strcmp(key, "audiosamplerate") ||
665 !strcmp(key, "audiosamplesize") ||
666 !strcmp(key, "stereo") ||
667 !strcmp(key, "audiocodecid") ||
668 !strcmp(key, "datastream")) && !flv->dump_full_metadata)
669 return 0;
670
671 s->event_flags |= AVFMT_EVENT_FLAG_METADATA_UPDATED;
672 if (amf_type == AMF_DATA_TYPE_BOOL) {
673 av_strlcpy(str_val, num_val > 0 ? "true" : "false",
674 sizeof(str_val));
675 av_dict_set(&s->metadata, key, str_val, 0);
676 } else if (amf_type == AMF_DATA_TYPE_NUMBER) {
677 snprintf(str_val, sizeof(str_val), "%.f", num_val);
678 av_dict_set(&s->metadata, key, str_val, 0);
679 } else if (amf_type == AMF_DATA_TYPE_STRING) {
680 av_dict_set(&s->metadata, key, str_val, 0);
681 } else if (amf_type == AMF_DATA_TYPE_DATE) {
682 time_t time;
683 struct tm t;
684 char datestr[128];
685 time = date.milliseconds / 1000; // to seconds
686 localtime_r(&time, &t);
687 strftime(datestr, sizeof(datestr), "%a, %d %b %Y %H:%M:%S %z", &t);
688
689 av_dict_set(&s->metadata, key, datestr, 0);
690 }
691 }
692
693 return 0;
694 }
695
696 #define TYPE_ONTEXTDATA 1
697 #define TYPE_ONCAPTION 2
698 #define TYPE_ONCAPTIONINFO 3
699 #define TYPE_UNKNOWN 9
700
flv_read_metabody(AVFormatContext * s,int64_t next_pos)701 static int flv_read_metabody(AVFormatContext *s, int64_t next_pos)
702 {
703 FLVContext *flv = s->priv_data;
704 AMFDataType type;
705 AVStream *stream, *astream, *vstream;
706 AVStream av_unused *dstream;
707 AVIOContext *ioc;
708 int i;
709 char buffer[32];
710
711 astream = NULL;
712 vstream = NULL;
713 dstream = NULL;
714 ioc = s->pb;
715
716 // first object needs to be "onMetaData" string
717 type = avio_r8(ioc);
718 if (type != AMF_DATA_TYPE_STRING ||
719 amf_get_string(ioc, buffer, sizeof(buffer)) < 0)
720 return TYPE_UNKNOWN;
721
722 if (!strcmp(buffer, "onTextData"))
723 return TYPE_ONTEXTDATA;
724
725 if (!strcmp(buffer, "onCaption"))
726 return TYPE_ONCAPTION;
727
728 if (!strcmp(buffer, "onCaptionInfo"))
729 return TYPE_ONCAPTIONINFO;
730
731 if (strcmp(buffer, "onMetaData") && strcmp(buffer, "onCuePoint")) {
732 av_log(s, AV_LOG_DEBUG, "Unknown type %s\n", buffer);
733 return TYPE_UNKNOWN;
734 }
735
736 // find the streams now so that amf_parse_object doesn't need to do
737 // the lookup every time it is called.
738 for (i = 0; i < s->nb_streams; i++) {
739 stream = s->streams[i];
740 if (stream->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
741 vstream = stream;
742 flv->last_keyframe_stream_index = i;
743 } else if (stream->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
744 astream = stream;
745 if (flv->last_keyframe_stream_index == -1)
746 flv->last_keyframe_stream_index = i;
747 }
748 else if (stream->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE)
749 dstream = stream;
750 }
751
752 // parse the second object (we want a mixed array)
753 if (amf_parse_object(s, astream, vstream, buffer, next_pos, 0) < 0)
754 return -1;
755
756 return 0;
757 }
758
flv_read_header(AVFormatContext * s)759 static int flv_read_header(AVFormatContext *s)
760 {
761 int flags;
762 FLVContext *flv = s->priv_data;
763 int offset;
764 int pre_tag_size = 0;
765
766 /* Actual FLV data at 0xe40000 in KUX file */
767 if(!strcmp(s->iformat->name, "kux"))
768 avio_skip(s->pb, 0xe40000);
769
770 avio_skip(s->pb, 4);
771 flags = avio_r8(s->pb);
772
773 flv->missing_streams = flags & (FLV_HEADER_FLAG_HASVIDEO | FLV_HEADER_FLAG_HASAUDIO);
774
775 s->ctx_flags |= AVFMTCTX_NOHEADER;
776
777 offset = avio_rb32(s->pb);
778 avio_seek(s->pb, offset, SEEK_SET);
779
780 /* Annex E. The FLV File Format
781 * E.3 TheFLVFileBody
782 * Field Type Comment
783 * PreviousTagSize0 UI32 Always 0
784 * */
785 pre_tag_size = avio_rb32(s->pb);
786 if (pre_tag_size) {
787 av_log(s, AV_LOG_WARNING, "Read FLV header error, input file is not a standard flv format, first PreviousTagSize0 always is 0\n");
788 }
789
790 s->start_time = 0;
791 flv->sum_flv_tag_size = 0;
792 flv->last_keyframe_stream_index = -1;
793
794 return 0;
795 }
796
flv_read_close(AVFormatContext * s)797 static int flv_read_close(AVFormatContext *s)
798 {
799 int i;
800 FLVContext *flv = s->priv_data;
801 for (i=0; i<FLV_STREAM_TYPE_NB; i++)
802 av_freep(&flv->new_extradata[i]);
803 av_freep(&flv->keyframe_times);
804 av_freep(&flv->keyframe_filepositions);
805 return 0;
806 }
807
flv_get_extradata(AVFormatContext * s,AVStream * st,int size)808 static int flv_get_extradata(AVFormatContext *s, AVStream *st, int size)
809 {
810 int ret;
811 if (!size)
812 return 0;
813
814 if ((ret = ff_get_extradata(s, st->codecpar, s->pb, size)) < 0)
815 return ret;
816 st->internal->need_context_update = 1;
817 return 0;
818 }
819
flv_queue_extradata(FLVContext * flv,AVIOContext * pb,int stream,int size)820 static int flv_queue_extradata(FLVContext *flv, AVIOContext *pb, int stream,
821 int size)
822 {
823 if (!size)
824 return 0;
825
826 av_free(flv->new_extradata[stream]);
827 flv->new_extradata[stream] = av_mallocz(size +
828 AV_INPUT_BUFFER_PADDING_SIZE);
829 if (!flv->new_extradata[stream])
830 return AVERROR(ENOMEM);
831 flv->new_extradata_size[stream] = size;
832 avio_read(pb, flv->new_extradata[stream], size);
833 return 0;
834 }
835
clear_index_entries(AVFormatContext * s,int64_t pos)836 static void clear_index_entries(AVFormatContext *s, int64_t pos)
837 {
838 int i, j, out;
839 av_log(s, AV_LOG_WARNING,
840 "Found invalid index entries, clearing the index.\n");
841 for (i = 0; i < s->nb_streams; i++) {
842 AVStream *st = s->streams[i];
843 /* Remove all index entries that point to >= pos */
844 out = 0;
845 for (j = 0; j < st->nb_index_entries; j++)
846 if (st->index_entries[j].pos < pos)
847 st->index_entries[out++] = st->index_entries[j];
848 st->nb_index_entries = out;
849 }
850 }
851
amf_skip_tag(AVIOContext * pb,AMFDataType type,int depth)852 static int amf_skip_tag(AVIOContext *pb, AMFDataType type, int depth)
853 {
854 int nb = -1, ret, parse_name = 1;
855
856 if (depth > MAX_DEPTH)
857 return AVERROR_PATCHWELCOME;
858
859 if (avio_feof(pb))
860 return AVERROR_EOF;
861
862 switch (type) {
863 case AMF_DATA_TYPE_NUMBER:
864 avio_skip(pb, 8);
865 break;
866 case AMF_DATA_TYPE_BOOL:
867 avio_skip(pb, 1);
868 break;
869 case AMF_DATA_TYPE_STRING:
870 avio_skip(pb, avio_rb16(pb));
871 break;
872 case AMF_DATA_TYPE_ARRAY:
873 parse_name = 0;
874 case AMF_DATA_TYPE_MIXEDARRAY:
875 nb = avio_rb32(pb);
876 case AMF_DATA_TYPE_OBJECT:
877 while(!pb->eof_reached && (nb-- > 0 || type != AMF_DATA_TYPE_ARRAY)) {
878 if (parse_name) {
879 int size = avio_rb16(pb);
880 if (!size) {
881 avio_skip(pb, 1);
882 break;
883 }
884 avio_skip(pb, size);
885 }
886 if ((ret = amf_skip_tag(pb, avio_r8(pb), depth + 1)) < 0)
887 return ret;
888 }
889 break;
890 case AMF_DATA_TYPE_NULL:
891 case AMF_DATA_TYPE_OBJECT_END:
892 break;
893 default:
894 return AVERROR_INVALIDDATA;
895 }
896 return 0;
897 }
898
flv_data_packet(AVFormatContext * s,AVPacket * pkt,int64_t dts,int64_t next)899 static int flv_data_packet(AVFormatContext *s, AVPacket *pkt,
900 int64_t dts, int64_t next)
901 {
902 AVIOContext *pb = s->pb;
903 AVStream *st = NULL;
904 char buf[20];
905 int ret = AVERROR_INVALIDDATA;
906 int i, length = -1;
907 int array = 0;
908
909 switch (avio_r8(pb)) {
910 case AMF_DATA_TYPE_ARRAY:
911 array = 1;
912 case AMF_DATA_TYPE_MIXEDARRAY:
913 avio_seek(pb, 4, SEEK_CUR);
914 case AMF_DATA_TYPE_OBJECT:
915 break;
916 default:
917 goto skip;
918 }
919
920 while (array || (ret = amf_get_string(pb, buf, sizeof(buf))) > 0) {
921 AMFDataType type = avio_r8(pb);
922 if (type == AMF_DATA_TYPE_STRING && (array || !strcmp(buf, "text"))) {
923 length = avio_rb16(pb);
924 ret = av_get_packet(pb, pkt, length);
925 if (ret < 0)
926 goto skip;
927 else
928 break;
929 } else {
930 if ((ret = amf_skip_tag(pb, type, 0)) < 0)
931 goto skip;
932 }
933 }
934
935 if (length < 0) {
936 ret = AVERROR_INVALIDDATA;
937 goto skip;
938 }
939
940 for (i = 0; i < s->nb_streams; i++) {
941 st = s->streams[i];
942 if (st->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE)
943 break;
944 }
945
946 if (i == s->nb_streams) {
947 st = create_stream(s, AVMEDIA_TYPE_SUBTITLE);
948 if (!st)
949 return AVERROR(ENOMEM);
950 st->codecpar->codec_id = AV_CODEC_ID_TEXT;
951 }
952
953 pkt->dts = dts;
954 pkt->pts = dts;
955 pkt->size = ret;
956
957 pkt->stream_index = st->index;
958 pkt->flags |= AV_PKT_FLAG_KEY;
959
960 skip:
961 avio_seek(s->pb, next + 4, SEEK_SET);
962
963 return ret;
964 }
965
resync(AVFormatContext * s)966 static int resync(AVFormatContext *s)
967 {
968 FLVContext *flv = s->priv_data;
969 int64_t i;
970 int64_t pos = avio_tell(s->pb);
971
972 for (i=0; !avio_feof(s->pb); i++) {
973 int j = i & (RESYNC_BUFFER_SIZE-1);
974 int j1 = j + RESYNC_BUFFER_SIZE;
975 flv->resync_buffer[j ] =
976 flv->resync_buffer[j1] = avio_r8(s->pb);
977
978 if (i >= 8 && pos) {
979 uint8_t *d = flv->resync_buffer + j1 - 8;
980 if (d[0] == 'F' &&
981 d[1] == 'L' &&
982 d[2] == 'V' &&
983 d[3] < 5 && d[5] == 0) {
984 av_log(s, AV_LOG_WARNING, "Concatenated FLV detected, might fail to demux, decode and seek %"PRId64"\n", flv->last_ts);
985 flv->time_offset = flv->last_ts + 1;
986 flv->time_pos = avio_tell(s->pb);
987 }
988 }
989
990 if (i > 22) {
991 unsigned lsize2 = AV_RB32(flv->resync_buffer + j1 - 4);
992 if (lsize2 >= 11 && lsize2 + 8LL < FFMIN(i, RESYNC_BUFFER_SIZE)) {
993 unsigned size2 = AV_RB24(flv->resync_buffer + j1 - lsize2 + 1 - 4);
994 unsigned lsize1 = AV_RB32(flv->resync_buffer + j1 - lsize2 - 8);
995 if (lsize1 >= 11 && lsize1 + 8LL + lsize2 < FFMIN(i, RESYNC_BUFFER_SIZE)) {
996 unsigned size1 = AV_RB24(flv->resync_buffer + j1 - lsize1 + 1 - lsize2 - 8);
997 if (size1 == lsize1 - 11 && size2 == lsize2 - 11) {
998 avio_seek(s->pb, pos + i - lsize1 - lsize2 - 8, SEEK_SET);
999 return 1;
1000 }
1001 }
1002 }
1003 }
1004 }
1005 return AVERROR_EOF;
1006 }
1007
flv_read_packet(AVFormatContext * s,AVPacket * pkt)1008 static int flv_read_packet(AVFormatContext *s, AVPacket *pkt)
1009 {
1010 FLVContext *flv = s->priv_data;
1011 int ret, i, size, flags;
1012 enum FlvTagType type;
1013 int stream_type=-1;
1014 int64_t next, pos, meta_pos;
1015 int64_t dts, pts = AV_NOPTS_VALUE;
1016 int av_uninit(channels);
1017 int av_uninit(sample_rate);
1018 AVStream *st = NULL;
1019 int last = -1;
1020 int orig_size;
1021
1022 retry:
1023 /* pkt size is repeated at end. skip it */
1024 pos = avio_tell(s->pb);
1025 type = (avio_r8(s->pb) & 0x1F);
1026 orig_size =
1027 size = avio_rb24(s->pb);
1028 flv->sum_flv_tag_size += size + 11;
1029 dts = avio_rb24(s->pb);
1030 dts |= (unsigned)avio_r8(s->pb) << 24;
1031 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));
1032 if (avio_feof(s->pb))
1033 return AVERROR_EOF;
1034 avio_skip(s->pb, 3); /* stream id, always 0 */
1035 flags = 0;
1036
1037 if (flv->validate_next < flv->validate_count) {
1038 int64_t validate_pos = flv->validate_index[flv->validate_next].pos;
1039 if (pos == validate_pos) {
1040 if (FFABS(dts - flv->validate_index[flv->validate_next].dts) <=
1041 VALIDATE_INDEX_TS_THRESH) {
1042 flv->validate_next++;
1043 } else {
1044 clear_index_entries(s, validate_pos);
1045 flv->validate_count = 0;
1046 }
1047 } else if (pos > validate_pos) {
1048 clear_index_entries(s, validate_pos);
1049 flv->validate_count = 0;
1050 }
1051 }
1052
1053 if (size == 0) {
1054 ret = FFERROR_REDO;
1055 goto leave;
1056 }
1057
1058 next = size + avio_tell(s->pb);
1059
1060 if (type == FLV_TAG_TYPE_AUDIO) {
1061 stream_type = FLV_STREAM_TYPE_AUDIO;
1062 flags = avio_r8(s->pb);
1063 size--;
1064 } else if (type == FLV_TAG_TYPE_VIDEO) {
1065 stream_type = FLV_STREAM_TYPE_VIDEO;
1066 flags = avio_r8(s->pb);
1067 size--;
1068 if ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_VIDEO_INFO_CMD)
1069 goto skip;
1070 } else if (type == FLV_TAG_TYPE_META) {
1071 stream_type=FLV_STREAM_TYPE_SUBTITLE;
1072 if (size > 13 + 1 + 4) { // Header-type metadata stuff
1073 int type;
1074 meta_pos = avio_tell(s->pb);
1075 type = flv_read_metabody(s, next);
1076 if (type == 0 && dts == 0 || type < 0) {
1077 if (type < 0 && flv->validate_count &&
1078 flv->validate_index[0].pos > next &&
1079 flv->validate_index[0].pos - 4 < next
1080 ) {
1081 av_log(s, AV_LOG_WARNING, "Adjusting next position due to index mismatch\n");
1082 next = flv->validate_index[0].pos - 4;
1083 }
1084 goto skip;
1085 } else if (type == TYPE_ONTEXTDATA) {
1086 avpriv_request_sample(s, "OnTextData packet");
1087 return flv_data_packet(s, pkt, dts, next);
1088 } else if (type == TYPE_ONCAPTION) {
1089 return flv_data_packet(s, pkt, dts, next);
1090 } else if (type == TYPE_UNKNOWN) {
1091 stream_type = FLV_STREAM_TYPE_DATA;
1092 }
1093 avio_seek(s->pb, meta_pos, SEEK_SET);
1094 }
1095 } else {
1096 av_log(s, AV_LOG_DEBUG,
1097 "Skipping flv packet: type %d, size %d, flags %d.\n",
1098 type, size, flags);
1099 skip:
1100 if (avio_seek(s->pb, next, SEEK_SET) != next) {
1101 // This can happen if flv_read_metabody above read past
1102 // next, on a non-seekable input, and the preceding data has
1103 // been flushed out from the IO buffer.
1104 av_log(s, AV_LOG_ERROR, "Unable to seek to the next packet\n");
1105 return AVERROR_INVALIDDATA;
1106 }
1107 ret = FFERROR_REDO;
1108 goto leave;
1109 }
1110
1111 /* skip empty data packets */
1112 if (!size) {
1113 ret = FFERROR_REDO;
1114 goto leave;
1115 }
1116
1117 /* now find stream */
1118 for (i = 0; i < s->nb_streams; i++) {
1119 st = s->streams[i];
1120 if (stream_type == FLV_STREAM_TYPE_AUDIO) {
1121 if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO &&
1122 (s->audio_codec_id || flv_same_audio_codec(st->codecpar, flags)))
1123 break;
1124 } else if (stream_type == FLV_STREAM_TYPE_VIDEO) {
1125 if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO &&
1126 (s->video_codec_id || flv_same_video_codec(st->codecpar, flags)))
1127 break;
1128 } else if (stream_type == FLV_STREAM_TYPE_SUBTITLE) {
1129 if (st->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE)
1130 break;
1131 } else if (stream_type == FLV_STREAM_TYPE_DATA) {
1132 if (st->codecpar->codec_type == AVMEDIA_TYPE_DATA)
1133 break;
1134 }
1135 }
1136 if (i == s->nb_streams) {
1137 static const enum AVMediaType stream_types[] = {AVMEDIA_TYPE_VIDEO, AVMEDIA_TYPE_AUDIO, AVMEDIA_TYPE_SUBTITLE, AVMEDIA_TYPE_DATA};
1138 st = create_stream(s, stream_types[stream_type]);
1139 if (!st)
1140 return AVERROR(ENOMEM);
1141
1142 }
1143 av_log(s, AV_LOG_TRACE, "%d %X %d \n", stream_type, flags, st->discard);
1144
1145 if (flv->time_pos <= pos) {
1146 dts += flv->time_offset;
1147 }
1148
1149 if ((s->pb->seekable & AVIO_SEEKABLE_NORMAL) &&
1150 ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY ||
1151 stream_type == FLV_STREAM_TYPE_AUDIO))
1152 av_add_index_entry(st, pos, dts, size, 0, AVINDEX_KEYFRAME);
1153
1154 if ( (st->discard >= AVDISCARD_NONKEY && !((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY || (stream_type == FLV_STREAM_TYPE_AUDIO)))
1155 ||(st->discard >= AVDISCARD_BIDIR && ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_DISP_INTER && (stream_type == FLV_STREAM_TYPE_VIDEO)))
1156 || st->discard >= AVDISCARD_ALL
1157 ) {
1158 avio_seek(s->pb, next, SEEK_SET);
1159 ret = FFERROR_REDO;
1160 goto leave;
1161 }
1162
1163 // if not streamed and no duration from metadata then seek to end to find
1164 // the duration from the timestamps
1165 if ((s->pb->seekable & AVIO_SEEKABLE_NORMAL) &&
1166 (!s->duration || s->duration == AV_NOPTS_VALUE) &&
1167 !flv->searched_for_end) {
1168 int size;
1169 const int64_t pos = avio_tell(s->pb);
1170 // Read the last 4 bytes of the file, this should be the size of the
1171 // previous FLV tag. Use the timestamp of its payload as duration.
1172 int64_t fsize = avio_size(s->pb);
1173 retry_duration:
1174 avio_seek(s->pb, fsize - 4, SEEK_SET);
1175 size = avio_rb32(s->pb);
1176 if (size > 0 && size < fsize) {
1177 // Seek to the start of the last FLV tag at position (fsize - 4 - size)
1178 // but skip the byte indicating the type.
1179 avio_seek(s->pb, fsize - 3 - size, SEEK_SET);
1180 if (size == avio_rb24(s->pb) + 11) {
1181 uint32_t ts = avio_rb24(s->pb);
1182 ts |= (unsigned)avio_r8(s->pb) << 24;
1183 if (ts)
1184 s->duration = ts * (int64_t)AV_TIME_BASE / 1000;
1185 else if (fsize >= 8 && fsize - 8 >= size) {
1186 fsize -= size+4;
1187 goto retry_duration;
1188 }
1189 }
1190 }
1191
1192 avio_seek(s->pb, pos, SEEK_SET);
1193 flv->searched_for_end = 1;
1194 }
1195
1196 if (stream_type == FLV_STREAM_TYPE_AUDIO) {
1197 int bits_per_coded_sample;
1198 channels = (flags & FLV_AUDIO_CHANNEL_MASK) == FLV_STEREO ? 2 : 1;
1199 sample_rate = 44100 << ((flags & FLV_AUDIO_SAMPLERATE_MASK) >>
1200 FLV_AUDIO_SAMPLERATE_OFFSET) >> 3;
1201 bits_per_coded_sample = (flags & FLV_AUDIO_SAMPLESIZE_MASK) ? 16 : 8;
1202 if (!st->codecpar->channels || !st->codecpar->sample_rate ||
1203 !st->codecpar->bits_per_coded_sample) {
1204 st->codecpar->channels = channels;
1205 st->codecpar->channel_layout = channels == 1
1206 ? AV_CH_LAYOUT_MONO
1207 : AV_CH_LAYOUT_STEREO;
1208 st->codecpar->sample_rate = sample_rate;
1209 st->codecpar->bits_per_coded_sample = bits_per_coded_sample;
1210 }
1211 if (!st->codecpar->codec_id) {
1212 flv_set_audio_codec(s, st, st->codecpar,
1213 flags & FLV_AUDIO_CODECID_MASK);
1214 flv->last_sample_rate =
1215 sample_rate = st->codecpar->sample_rate;
1216 flv->last_channels =
1217 channels = st->codecpar->channels;
1218 } else {
1219 AVCodecParameters *par = avcodec_parameters_alloc();
1220 if (!par) {
1221 ret = AVERROR(ENOMEM);
1222 goto leave;
1223 }
1224 par->sample_rate = sample_rate;
1225 par->bits_per_coded_sample = bits_per_coded_sample;
1226 flv_set_audio_codec(s, st, par, flags & FLV_AUDIO_CODECID_MASK);
1227 sample_rate = par->sample_rate;
1228 avcodec_parameters_free(&par);
1229 }
1230 } else if (stream_type == FLV_STREAM_TYPE_VIDEO) {
1231 int ret = flv_set_video_codec(s, st, flags & FLV_VIDEO_CODECID_MASK, 1);
1232 if (ret < 0)
1233 return ret;
1234 size -= ret;
1235 } else if (stream_type == FLV_STREAM_TYPE_SUBTITLE) {
1236 st->codecpar->codec_id = AV_CODEC_ID_TEXT;
1237 } else if (stream_type == FLV_STREAM_TYPE_DATA) {
1238 st->codecpar->codec_id = AV_CODEC_ID_NONE; // Opaque AMF data
1239 }
1240
1241 if (st->codecpar->codec_id == AV_CODEC_ID_AAC ||
1242 st->codecpar->codec_id == AV_CODEC_ID_H264 ||
1243 st->codecpar->codec_id == AV_CODEC_ID_MPEG4) {
1244 int type = avio_r8(s->pb);
1245 size--;
1246
1247 if (size < 0) {
1248 ret = AVERROR_INVALIDDATA;
1249 goto leave;
1250 }
1251
1252 if (st->codecpar->codec_id == AV_CODEC_ID_H264 || st->codecpar->codec_id == AV_CODEC_ID_MPEG4) {
1253 // sign extension
1254 int32_t cts = (avio_rb24(s->pb) + 0xff800000) ^ 0xff800000;
1255 pts = av_sat_add64(dts, cts);
1256 if (cts < 0) { // dts might be wrong
1257 if (!flv->wrong_dts)
1258 av_log(s, AV_LOG_WARNING,
1259 "Negative cts, previous timestamps might be wrong.\n");
1260 flv->wrong_dts = 1;
1261 } else if (FFABS(dts - pts) > 1000*60*15) {
1262 av_log(s, AV_LOG_WARNING,
1263 "invalid timestamps %"PRId64" %"PRId64"\n", dts, pts);
1264 dts = pts = AV_NOPTS_VALUE;
1265 }
1266 }
1267 if (type == 0 && (!st->codecpar->extradata || st->codecpar->codec_id == AV_CODEC_ID_AAC ||
1268 st->codecpar->codec_id == AV_CODEC_ID_H264)) {
1269 AVDictionaryEntry *t;
1270
1271 if (st->codecpar->extradata) {
1272 if ((ret = flv_queue_extradata(flv, s->pb, stream_type, size)) < 0)
1273 return ret;
1274 ret = FFERROR_REDO;
1275 goto leave;
1276 }
1277 if ((ret = flv_get_extradata(s, st, size)) < 0)
1278 return ret;
1279
1280 /* Workaround for buggy Omnia A/XE encoder */
1281 t = av_dict_get(s->metadata, "Encoder", NULL, 0);
1282 if (st->codecpar->codec_id == AV_CODEC_ID_AAC && t && !strcmp(t->value, "Omnia A/XE"))
1283 st->codecpar->extradata_size = 2;
1284
1285 ret = FFERROR_REDO;
1286 goto leave;
1287 }
1288 }
1289
1290 /* skip empty data packets */
1291 if (!size) {
1292 ret = FFERROR_REDO;
1293 goto leave;
1294 }
1295
1296 ret = av_get_packet(s->pb, pkt, size);
1297 if (ret < 0)
1298 return ret;
1299 pkt->dts = dts;
1300 pkt->pts = pts == AV_NOPTS_VALUE ? dts : pts;
1301 pkt->stream_index = st->index;
1302 pkt->pos = pos;
1303 if (flv->new_extradata[stream_type]) {
1304 int ret = av_packet_add_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA,
1305 flv->new_extradata[stream_type],
1306 flv->new_extradata_size[stream_type]);
1307 if (ret >= 0) {
1308 flv->new_extradata[stream_type] = NULL;
1309 flv->new_extradata_size[stream_type] = 0;
1310 }
1311 }
1312 if (stream_type == FLV_STREAM_TYPE_AUDIO &&
1313 (sample_rate != flv->last_sample_rate ||
1314 channels != flv->last_channels)) {
1315 flv->last_sample_rate = sample_rate;
1316 flv->last_channels = channels;
1317 ff_add_param_change(pkt, channels, 0, sample_rate, 0, 0);
1318 }
1319
1320 if ( stream_type == FLV_STREAM_TYPE_AUDIO ||
1321 ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY) ||
1322 stream_type == FLV_STREAM_TYPE_SUBTITLE ||
1323 stream_type == FLV_STREAM_TYPE_DATA)
1324 pkt->flags |= AV_PKT_FLAG_KEY;
1325
1326 leave:
1327 last = avio_rb32(s->pb);
1328 if (!flv->trust_datasize) {
1329 if (last != orig_size + 11 && last != orig_size + 10 &&
1330 !avio_feof(s->pb) &&
1331 (last != orig_size || !last) && last != flv->sum_flv_tag_size &&
1332 !flv->broken_sizes) {
1333 av_log(s, AV_LOG_ERROR, "Packet mismatch %d %d %d\n", last, orig_size + 11, flv->sum_flv_tag_size);
1334 avio_seek(s->pb, pos + 1, SEEK_SET);
1335 ret = resync(s);
1336 av_packet_unref(pkt);
1337 if (ret >= 0) {
1338 goto retry;
1339 }
1340 }
1341 }
1342
1343 if (ret >= 0)
1344 flv->last_ts = pkt->dts;
1345
1346 return ret;
1347 }
1348
flv_read_seek(AVFormatContext * s,int stream_index,int64_t ts,int flags)1349 static int flv_read_seek(AVFormatContext *s, int stream_index,
1350 int64_t ts, int flags)
1351 {
1352 FLVContext *flv = s->priv_data;
1353 flv->validate_count = 0;
1354 return avio_seek_time(s->pb, stream_index, ts, flags);
1355 }
1356
1357 #define OFFSET(x) offsetof(FLVContext, x)
1358 #define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM
1359 static const AVOption options[] = {
1360 { "flv_metadata", "Allocate streams according to the onMetaData array", OFFSET(trust_metadata), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, VD },
1361 { "flv_full_metadata", "Dump full metadata of the onMetadata", OFFSET(dump_full_metadata), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, VD },
1362 { "flv_ignore_prevtag", "Ignore the Size of previous tag", OFFSET(trust_datasize), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, VD },
1363 { "missing_streams", "", OFFSET(missing_streams), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 0xFF, VD | AV_OPT_FLAG_EXPORT | AV_OPT_FLAG_READONLY },
1364 { NULL }
1365 };
1366
1367 static const AVClass flv_class = {
1368 .class_name = "flvdec",
1369 .item_name = av_default_item_name,
1370 .option = options,
1371 .version = LIBAVUTIL_VERSION_INT,
1372 };
1373
1374 AVInputFormat ff_flv_demuxer = {
1375 .name = "flv",
1376 .long_name = NULL_IF_CONFIG_SMALL("FLV (Flash Video)"),
1377 .priv_data_size = sizeof(FLVContext),
1378 .read_probe = flv_probe,
1379 .read_header = flv_read_header,
1380 .read_packet = flv_read_packet,
1381 .read_seek = flv_read_seek,
1382 .read_close = flv_read_close,
1383 .extensions = "flv",
1384 .priv_class = &flv_class,
1385 };
1386
1387 static const AVClass live_flv_class = {
1388 .class_name = "live_flvdec",
1389 .item_name = av_default_item_name,
1390 .option = options,
1391 .version = LIBAVUTIL_VERSION_INT,
1392 };
1393
1394 AVInputFormat ff_live_flv_demuxer = {
1395 .name = "live_flv",
1396 .long_name = NULL_IF_CONFIG_SMALL("live RTMP FLV (Flash Video)"),
1397 .priv_data_size = sizeof(FLVContext),
1398 .read_probe = live_flv_probe,
1399 .read_header = flv_read_header,
1400 .read_packet = flv_read_packet,
1401 .read_seek = flv_read_seek,
1402 .read_close = flv_read_close,
1403 .extensions = "flv",
1404 .priv_class = &live_flv_class,
1405 .flags = AVFMT_TS_DISCONT
1406 };
1407
1408 static const AVClass kux_class = {
1409 .class_name = "kuxdec",
1410 .item_name = av_default_item_name,
1411 .option = options,
1412 .version = LIBAVUTIL_VERSION_INT,
1413 };
1414
1415 AVInputFormat ff_kux_demuxer = {
1416 .name = "kux",
1417 .long_name = NULL_IF_CONFIG_SMALL("KUX (YouKu)"),
1418 .priv_data_size = sizeof(FLVContext),
1419 .read_probe = kux_probe,
1420 .read_header = flv_read_header,
1421 .read_packet = flv_read_packet,
1422 .read_seek = flv_read_seek,
1423 .read_close = flv_read_close,
1424 .extensions = "kux",
1425 .priv_class = &kux_class,
1426 };
1427