repositories / deb_ffmpeg.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
Imported Debian version 2.5.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavformat / flvdec.c
CommitLineData
2ba45a60
DM		 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 4bits: difference between encoded width and visible width
8 * - lower 4bits: 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
42typedef struct {
43 const AVClass *class; ///< Class for private options.
44 int trust_metadata; ///< configure streams according onMetaData
45 int wrong_dts; ///< wrong dts due to negative cts
46 uint8_t *new_extradata[FLV_STREAM_TYPE_NB];
47 int new_extradata_size[FLV_STREAM_TYPE_NB];
48 int last_sample_rate;
49 int last_channels;
50 struct {
51 int64_t dts;
52 int64_t pos;
53 } validate_index[2];
54 int validate_next;
55 int validate_count;
56 int searched_for_end;
57} FLVContext;
58
59static int probe(AVProbeData *p, int live)
60{
61 const uint8_t *d = p->buf;
62 unsigned offset = AV_RB32(d + 5);
63
64 if (d[0] == 'F' &&
65 d[1] == 'L' &&
66 d[2] == 'V' &&
67 d[3] < 5 && d[5] == 0 &&
68 offset + 100 < p->buf_size &&
69 offset > 8) {
70 int is_live = !memcmp(d + offset + 40, "NGINX RTMP", 10);
71
72 if (live == is_live)
73 return AVPROBE_SCORE_MAX;
74 }
75 return 0;
76}
77
78static int flv_probe(AVProbeData *p)
79{
80 return probe(p, 0);
81}
82
83static int live_flv_probe(AVProbeData *p)
84{
85 return probe(p, 1);
86}
87
88static AVStream *create_stream(AVFormatContext *s, int codec_type)
89{
90 AVStream *st = avformat_new_stream(s, NULL);
91 if (!st)
92 return NULL;
93 st->codec->codec_type = codec_type;
94 if (s->nb_streams>=3 ||( s->nb_streams==2
95 && s->streams[0]->codec->codec_type != AVMEDIA_TYPE_DATA
96 && s->streams[1]->codec->codec_type != AVMEDIA_TYPE_DATA))
97 s->ctx_flags &= ~AVFMTCTX_NOHEADER;
98
99 avpriv_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
100 return st;
101}
102
103static int flv_same_audio_codec(AVCodecContext *acodec, int flags)
104{
105 int bits_per_coded_sample = (flags & FLV_AUDIO_SAMPLESIZE_MASK) ? 16 : 8;
106 int flv_codecid = flags & FLV_AUDIO_CODECID_MASK;
107 int codec_id;
108
109 if (!acodec->codec_id && !acodec->codec_tag)
110 return 1;
111
112 if (acodec->bits_per_coded_sample != bits_per_coded_sample)
113 return 0;
114
115 switch (flv_codecid) {
116 // no distinction between S16 and S8 PCM codec flags
117 case FLV_CODECID_PCM:
118 codec_id = bits_per_coded_sample == 8
119 ? AV_CODEC_ID_PCM_U8
120#if HAVE_BIGENDIAN
121 : AV_CODEC_ID_PCM_S16BE;
122#else
123 : AV_CODEC_ID_PCM_S16LE;
124#endif
125 return codec_id == acodec->codec_id;
126 case FLV_CODECID_PCM_LE:
127 codec_id = bits_per_coded_sample == 8
128 ? AV_CODEC_ID_PCM_U8
129 : AV_CODEC_ID_PCM_S16LE;
130 return codec_id == acodec->codec_id;
131 case FLV_CODECID_AAC:
132 return acodec->codec_id == AV_CODEC_ID_AAC;
133 case FLV_CODECID_ADPCM:
134 return acodec->codec_id == AV_CODEC_ID_ADPCM_SWF;
135 case FLV_CODECID_SPEEX:
136 return acodec->codec_id == AV_CODEC_ID_SPEEX;
137 case FLV_CODECID_MP3:
138 return acodec->codec_id == AV_CODEC_ID_MP3;
139 case FLV_CODECID_NELLYMOSER_8KHZ_MONO:
140 case FLV_CODECID_NELLYMOSER_16KHZ_MONO:
141 case FLV_CODECID_NELLYMOSER:
142 return acodec->codec_id == AV_CODEC_ID_NELLYMOSER;
143 case FLV_CODECID_PCM_MULAW:
144 return acodec->sample_rate == 8000 &&
145 acodec->codec_id == AV_CODEC_ID_PCM_MULAW;
146 case FLV_CODECID_PCM_ALAW:
147 return acodec->sample_rate == 8000 &&
148 acodec->codec_id == AV_CODEC_ID_PCM_ALAW;
149 default:
150 return acodec->codec_tag == (flv_codecid >> FLV_AUDIO_CODECID_OFFSET);
151 }
152}
153
154static void flv_set_audio_codec(AVFormatContext *s, AVStream *astream,
155 AVCodecContext *acodec, int flv_codecid)
156{
157 switch (flv_codecid) {
158 // no distinction between S16 and S8 PCM codec flags
159 case FLV_CODECID_PCM:
160 acodec->codec_id = acodec->bits_per_coded_sample == 8
161 ? AV_CODEC_ID_PCM_U8
162#if HAVE_BIGENDIAN
163 : AV_CODEC_ID_PCM_S16BE;
164#else
165 : AV_CODEC_ID_PCM_S16LE;
166#endif
167 break;
168 case FLV_CODECID_PCM_LE:
169 acodec->codec_id = acodec->bits_per_coded_sample == 8
170 ? AV_CODEC_ID_PCM_U8
171 : AV_CODEC_ID_PCM_S16LE;
172 break;
173 case FLV_CODECID_AAC:
174 acodec->codec_id = AV_CODEC_ID_AAC;
175 break;
176 case FLV_CODECID_ADPCM:
177 acodec->codec_id = AV_CODEC_ID_ADPCM_SWF;
178 break;
179 case FLV_CODECID_SPEEX:
180 acodec->codec_id = AV_CODEC_ID_SPEEX;
181 acodec->sample_rate = 16000;
182 break;
183 case FLV_CODECID_MP3:
184 acodec->codec_id = AV_CODEC_ID_MP3;
185 astream->need_parsing = AVSTREAM_PARSE_FULL;
186 break;
187 case FLV_CODECID_NELLYMOSER_8KHZ_MONO:
188 // in case metadata does not otherwise declare samplerate
189 acodec->sample_rate = 8000;
190 acodec->codec_id = AV_CODEC_ID_NELLYMOSER;
191 break;
192 case FLV_CODECID_NELLYMOSER_16KHZ_MONO:
193 acodec->sample_rate = 16000;
194 acodec->codec_id = AV_CODEC_ID_NELLYMOSER;
195 break;
196 case FLV_CODECID_NELLYMOSER:
197 acodec->codec_id = AV_CODEC_ID_NELLYMOSER;
198 break;
199 case FLV_CODECID_PCM_MULAW:
200 acodec->sample_rate = 8000;
201 acodec->codec_id = AV_CODEC_ID_PCM_MULAW;
202 break;
203 case FLV_CODECID_PCM_ALAW:
204 acodec->sample_rate = 8000;
205 acodec->codec_id = AV_CODEC_ID_PCM_ALAW;
206 break;
207 default:
208 avpriv_request_sample(s, "Audio codec (%x)",
209 flv_codecid >> FLV_AUDIO_CODECID_OFFSET);
210 acodec->codec_tag = flv_codecid >> FLV_AUDIO_CODECID_OFFSET;
211 }
212}
213
214static int flv_same_video_codec(AVCodecContext *vcodec, int flags)
215{
216 int flv_codecid = flags & FLV_VIDEO_CODECID_MASK;
217
218 if (!vcodec->codec_id && !vcodec->codec_tag)
219 return 1;
220
221 switch (flv_codecid) {
222 case FLV_CODECID_H263:
223 return vcodec->codec_id == AV_CODEC_ID_FLV1;
224 case FLV_CODECID_SCREEN:
225 return vcodec->codec_id == AV_CODEC_ID_FLASHSV;
226 case FLV_CODECID_SCREEN2:
227 return vcodec->codec_id == AV_CODEC_ID_FLASHSV2;
228 case FLV_CODECID_VP6:
229 return vcodec->codec_id == AV_CODEC_ID_VP6F;
230 case FLV_CODECID_VP6A:
231 return vcodec->codec_id == AV_CODEC_ID_VP6A;
232 case FLV_CODECID_H264:
233 return vcodec->codec_id == AV_CODEC_ID_H264;
234 default:
235 return vcodec->codec_tag == flv_codecid;
236 }
237}
238
239static int flv_set_video_codec(AVFormatContext *s, AVStream *vstream,
240 int flv_codecid, int read)
241{
242 AVCodecContext *vcodec = vstream->codec;
243 switch (flv_codecid) {
244 case FLV_CODECID_H263:
245 vcodec->codec_id = AV_CODEC_ID_FLV1;
246 break;
247 case FLV_CODECID_REALH263:
248 vcodec->codec_id = AV_CODEC_ID_H263;
249 break; // Really mean it this time
250 case FLV_CODECID_SCREEN:
251 vcodec->codec_id = AV_CODEC_ID_FLASHSV;
252 break;
253 case FLV_CODECID_SCREEN2:
254 vcodec->codec_id = AV_CODEC_ID_FLASHSV2;
255 break;
256 case FLV_CODECID_VP6:
257 vcodec->codec_id = AV_CODEC_ID_VP6F;
258 case FLV_CODECID_VP6A:
259 if (flv_codecid == FLV_CODECID_VP6A)
260 vcodec->codec_id = AV_CODEC_ID_VP6A;
261 if (read) {
262 if (vcodec->extradata_size != 1) {
263 ff_alloc_extradata(vcodec, 1);
264 }
265 if (vcodec->extradata)
266 vcodec->extradata[0] = avio_r8(s->pb);
267 else
268 avio_skip(s->pb, 1);
269 }
270 return 1; // 1 byte body size adjustment for flv_read_packet()
271 case FLV_CODECID_H264:
272 vcodec->codec_id = AV_CODEC_ID_H264;
273 vstream->need_parsing = AVSTREAM_PARSE_HEADERS;
274 return 3; // not 4, reading packet type will consume one byte
275 case FLV_CODECID_MPEG4:
276 vcodec->codec_id = AV_CODEC_ID_MPEG4;
277 return 3;
278 default:
279 avpriv_request_sample(s, "Video codec (%x)", flv_codecid);
280 vcodec->codec_tag = flv_codecid;
281 }
282
283 return 0;
284}
285
286static int amf_get_string(AVIOContext *ioc, char *buffer, int buffsize)
287{
288 int length = avio_rb16(ioc);
289 if (length >= buffsize) {
290 avio_skip(ioc, length);
291 return -1;
292 }
293
294 avio_read(ioc, buffer, length);
295
296 buffer[length] = '\0';
297
298 return length;
299}
300
301static int parse_keyframes_index(AVFormatContext *s, AVIOContext *ioc,
302 AVStream *vstream, int64_t max_pos)
303{
304 FLVContext *flv = s->priv_data;
305 unsigned int timeslen = 0, fileposlen = 0, i;
306 char str_val[256];
307 int64_t *times = NULL;
308 int64_t *filepositions = NULL;
309 int ret = AVERROR(ENOSYS);
310 int64_t initial_pos = avio_tell(ioc);
311
312 if (vstream->nb_index_entries>0) {
313 av_log(s, AV_LOG_WARNING, "Skipping duplicate index\n");
314 return 0;
315 }
316
317 if (s->flags & AVFMT_FLAG_IGNIDX)
318 return 0;
319
320 while (avio_tell(ioc) < max_pos - 2 &&
321 amf_get_string(ioc, str_val, sizeof(str_val)) > 0) {
322 int64_t **current_array;
323 unsigned int arraylen;
324
325 // Expect array object in context
326 if (avio_r8(ioc) != AMF_DATA_TYPE_ARRAY)
327 break;
328
329 arraylen = avio_rb32(ioc);
330 if (arraylen>>28)
331 break;
332
333 if (!strcmp(KEYFRAMES_TIMESTAMP_TAG , str_val) && !times) {
334 current_array = &times;
335 timeslen = arraylen;
336 } else if (!strcmp(KEYFRAMES_BYTEOFFSET_TAG, str_val) &&
337 !filepositions) {
338 current_array = &filepositions;
339 fileposlen = arraylen;
340 } else
341 // unexpected metatag inside keyframes, will not use such
342 // metadata for indexing
343 break;
344
345 if (!(*current_array = av_mallocz(sizeof(**current_array) * arraylen))) {
346 ret = AVERROR(ENOMEM);
347 goto finish;
348 }
349
350 for (i = 0; i < arraylen && avio_tell(ioc) < max_pos - 1; i++) {
351 if (avio_r8(ioc) != AMF_DATA_TYPE_NUMBER)
352 goto invalid;
353 current_array[0][i] = av_int2double(avio_rb64(ioc));
354 }
355 if (times && filepositions) {
356 // All done, exiting at a position allowing amf_parse_object
357 // to finish parsing the object
358 ret = 0;
359 break;
360 }
361 }
362
363 if (timeslen == fileposlen && fileposlen>1 && max_pos <= filepositions[0]) {
364 for (i = 0; i < fileposlen; i++) {
365 av_add_index_entry(vstream, filepositions[i], times[i] * 1000,
366 0, 0, AVINDEX_KEYFRAME);
367 if (i < 2) {
368 flv->validate_index[i].pos = filepositions[i];
369 flv->validate_index[i].dts = times[i] * 1000;
370 flv->validate_count = i + 1;
371 }
372 }
373 } else {
374invalid:
375 av_log(s, AV_LOG_WARNING, "Invalid keyframes object, skipping.\n");
376 }
377
378finish:
379 av_freep(&times);
380 av_freep(&filepositions);
381 avio_seek(ioc, initial_pos, SEEK_SET);
382 return ret;
383}
384
385static int amf_parse_object(AVFormatContext *s, AVStream *astream,
386 AVStream *vstream, const char *key,
387 int64_t max_pos, int depth)
388{
389 AVCodecContext *acodec, *vcodec;
390 FLVContext *flv = s->priv_data;
391 AVIOContext *ioc;
392 AMFDataType amf_type;
0e279ba6 393 char str_val[1024];
2ba45a60
DM		 394 double num_val;
395
396 num_val = 0;
397 ioc = s->pb;
398 amf_type = avio_r8(ioc);
399
400 switch (amf_type) {
401 case AMF_DATA_TYPE_NUMBER:
402 num_val = av_int2double(avio_rb64(ioc));
403 break;
404 case AMF_DATA_TYPE_BOOL:
405 num_val = avio_r8(ioc);
406 break;
407 case AMF_DATA_TYPE_STRING:
408 if (amf_get_string(ioc, str_val, sizeof(str_val)) < 0)
409 return -1;
410 break;
411 case AMF_DATA_TYPE_OBJECT:
412 if ((vstream || astream) && key &&
413 ioc->seekable &&
414 !strcmp(KEYFRAMES_TAG, key) && depth == 1)
415 if (parse_keyframes_index(s, ioc, vstream ? vstream : astream,
416 max_pos) < 0)
417 av_log(s, AV_LOG_ERROR, "Keyframe index parsing failed\n");
418
419 while (avio_tell(ioc) < max_pos - 2 &&
420 amf_get_string(ioc, str_val, sizeof(str_val)) > 0)
421 if (amf_parse_object(s, astream, vstream, str_val, max_pos,
422 depth + 1) < 0)
423 return -1; // if we couldn't skip, bomb out.
424 if (avio_r8(ioc) != AMF_END_OF_OBJECT)
425 return -1;
426 break;
427 case AMF_DATA_TYPE_NULL:
428 case AMF_DATA_TYPE_UNDEFINED:
429 case AMF_DATA_TYPE_UNSUPPORTED:
430 break; // these take up no additional space
431 case AMF_DATA_TYPE_MIXEDARRAY:
432 avio_skip(ioc, 4); // skip 32-bit max array index
433 while (avio_tell(ioc) < max_pos - 2 &&
434 amf_get_string(ioc, str_val, sizeof(str_val)) > 0)
435 // this is the only case in which we would want a nested
436 // parse to not skip over the object
437 if (amf_parse_object(s, astream, vstream, str_val, max_pos,
438 depth + 1) < 0)
439 return -1;
440 if (avio_r8(ioc) != AMF_END_OF_OBJECT)
441 return -1;
442 break;
443 case AMF_DATA_TYPE_ARRAY:
444 {
445 unsigned int arraylen, i;
446
447 arraylen = avio_rb32(ioc);
448 for (i = 0; i < arraylen && avio_tell(ioc) < max_pos - 1; i++)
449 if (amf_parse_object(s, NULL, NULL, NULL, max_pos,
450 depth + 1) < 0)
451 return -1; // if we couldn't skip, bomb out.
452 }
453 break;
454 case AMF_DATA_TYPE_DATE:
455 avio_skip(ioc, 8 + 2); // timestamp (double) and UTC offset (int16)
456 break;
457 default: // unsupported type, we couldn't skip
458 return -1;
459 }
460
461 if (key) {
dcebb6f3
DM		 462 acodec = astream ? astream->codec : NULL;
463 vcodec = vstream ? vstream->codec : NULL;
464
2ba45a60
DM		 465 // stream info doesn't live any deeper than the first object
466 if (depth == 1) {
2ba45a60
DM		 467 if (amf_type == AMF_DATA_TYPE_NUMBER ||
468 amf_type == AMF_DATA_TYPE_BOOL) {
469 if (!strcmp(key, "duration"))
470 s->duration = num_val * AV_TIME_BASE;
471 else if (!strcmp(key, "videodatarate") && vcodec &&
472 0 <= (int)(num_val * 1024.0))
473 vcodec->bit_rate = num_val * 1024.0;
474 else if (!strcmp(key, "audiodatarate") && acodec &&
475 0 <= (int)(num_val * 1024.0))
476 acodec->bit_rate = num_val * 1024.0;
477 else if (!strcmp(key, "datastream")) {
478 AVStream *st = create_stream(s, AVMEDIA_TYPE_DATA);
479 if (!st)
480 return AVERROR(ENOMEM);
481 st->codec->codec_id = AV_CODEC_ID_TEXT;
482 } else if (flv->trust_metadata) {
483 if (!strcmp(key, "videocodecid") && vcodec) {
484 flv_set_video_codec(s, vstream, num_val, 0);
485 } else if (!strcmp(key, "audiocodecid") && acodec) {
486 int id = ((int)num_val) << FLV_AUDIO_CODECID_OFFSET;
487 flv_set_audio_codec(s, astream, acodec, id);
488 } else if (!strcmp(key, "audiosamplerate") && acodec) {
489 acodec->sample_rate = num_val;
490 } else if (!strcmp(key, "audiosamplesize") && acodec) {
491 acodec->bits_per_coded_sample = num_val;
492 } else if (!strcmp(key, "stereo") && acodec) {
493 acodec->channels = num_val + 1;
494 acodec->channel_layout = acodec->channels == 2 ?
495 AV_CH_LAYOUT_STEREO :
496 AV_CH_LAYOUT_MONO;
497 } else if (!strcmp(key, "width") && vcodec) {
498 vcodec->width = num_val;
499 } else if (!strcmp(key, "height") && vcodec) {
500 vcodec->height = num_val;
501 }
502 }
503 }
504 }
505
506 if (amf_type == AMF_DATA_TYPE_OBJECT && s->nb_streams == 1 &&
507 ((!acodec && !strcmp(key, "audiocodecid")) ||
508 (!vcodec && !strcmp(key, "videocodecid"))))
509 s->ctx_flags &= ~AVFMTCTX_NOHEADER; //If there is either audio/video missing, codecid will be an empty object
510
511 if (!strcmp(key, "duration") ||
512 !strcmp(key, "filesize") ||
513 !strcmp(key, "width") ||
514 !strcmp(key, "height") ||
515 !strcmp(key, "videodatarate") ||
516 !strcmp(key, "framerate") ||
517 !strcmp(key, "videocodecid") ||
518 !strcmp(key, "audiodatarate") ||
519 !strcmp(key, "audiosamplerate") ||
520 !strcmp(key, "audiosamplesize") ||
521 !strcmp(key, "stereo") ||
522 !strcmp(key, "audiocodecid") ||
523 !strcmp(key, "datastream"))
524 return 0;
525
526 s->event_flags |= AVFMT_EVENT_FLAG_METADATA_UPDATED;
527 if (amf_type == AMF_DATA_TYPE_BOOL) {
528 av_strlcpy(str_val, num_val > 0 ? "true" : "false",
529 sizeof(str_val));
530 av_dict_set(&s->metadata, key, str_val, 0);
531 } else if (amf_type == AMF_DATA_TYPE_NUMBER) {
532 snprintf(str_val, sizeof(str_val), "%.f", num_val);
533 av_dict_set(&s->metadata, key, str_val, 0);
534 } else if (amf_type == AMF_DATA_TYPE_STRING)
535 av_dict_set(&s->metadata, key, str_val, 0);
536 }
537
538 return 0;
539}
540
541static int flv_read_metabody(AVFormatContext *s, int64_t next_pos)
542{
543 AMFDataType type;
544 AVStream *stream, *astream, *vstream;
545 AVStream av_unused *dstream;
546 AVIOContext *ioc;
547 int i;
548 // only needs to hold the string "onMetaData".
549 // Anything longer is something we don't want.
550 char buffer[11];
551
552 astream = NULL;
553 vstream = NULL;
554 dstream = NULL;
555 ioc = s->pb;
556
557 // first object needs to be "onMetaData" string
558 type = avio_r8(ioc);
559 if (type != AMF_DATA_TYPE_STRING ||
560 amf_get_string(ioc, buffer, sizeof(buffer)) < 0)
0e279ba6 561 return 2;
2ba45a60
DM		 562
563 if (!strcmp(buffer, "onTextData"))
564 return 1;
565
566 if (strcmp(buffer, "onMetaData") && strcmp(buffer, "onCuePoint"))
0e279ba6 567 return 2;
2ba45a60
DM		 568
569 // find the streams now so that amf_parse_object doesn't need to do
570 // the lookup every time it is called.
571 for (i = 0; i < s->nb_streams; i++) {
572 stream = s->streams[i];
573 if (stream->codec->codec_type == AVMEDIA_TYPE_VIDEO)
574 vstream = stream;
575 else if (stream->codec->codec_type == AVMEDIA_TYPE_AUDIO)
576 astream = stream;
577 else if (stream->codec->codec_type == AVMEDIA_TYPE_DATA)
578 dstream = stream;
579 }
580
581 // parse the second object (we want a mixed array)
582 if (amf_parse_object(s, astream, vstream, buffer, next_pos, 0) < 0)
583 return -1;
584
585 return 0;
586}
587
588static int flv_read_header(AVFormatContext *s)
589{
590 int offset, flags;
591
592 avio_skip(s->pb, 4);
593 flags = avio_r8(s->pb);
594
595 s->ctx_flags |= AVFMTCTX_NOHEADER;
596
597 if (flags & FLV_HEADER_FLAG_HASVIDEO)
598 if (!create_stream(s, AVMEDIA_TYPE_VIDEO))
599 return AVERROR(ENOMEM);
600 if (flags & FLV_HEADER_FLAG_HASAUDIO)
601 if (!create_stream(s, AVMEDIA_TYPE_AUDIO))
602 return AVERROR(ENOMEM);
603 // Flag doesn't indicate whether or not there is script-data present. Must
604 // create that stream if it's encountered.
605
606 offset = avio_rb32(s->pb);
607 avio_seek(s->pb, offset, SEEK_SET);
608 avio_skip(s->pb, 4);
609
610 s->start_time = 0;
611
612 return 0;
613}
614
615static int flv_read_close(AVFormatContext *s)
616{
617 int i;
618 FLVContext *flv = s->priv_data;
619 for (i=0; i<FLV_STREAM_TYPE_NB; i++)
620 av_freep(&flv->new_extradata[i]);
621 return 0;
622}
623
624static int flv_get_extradata(AVFormatContext *s, AVStream *st, int size)
625{
092a9121 626 av_freep(&st->codec->extradata);
2ba45a60
DM		 627 if (ff_get_extradata(st->codec, s->pb, size) < 0)
628 return AVERROR(ENOMEM);
629 return 0;
630}
631
632static int flv_queue_extradata(FLVContext *flv, AVIOContext *pb, int stream,
633 int size)
634{
635 av_free(flv->new_extradata[stream]);
636 flv->new_extradata[stream] = av_mallocz(size +
637 FF_INPUT_BUFFER_PADDING_SIZE);
638 if (!flv->new_extradata[stream])
639 return AVERROR(ENOMEM);
640 flv->new_extradata_size[stream] = size;
641 avio_read(pb, flv->new_extradata[stream], size);
642 return 0;
643}
644
645static void clear_index_entries(AVFormatContext *s, int64_t pos)
646{
647 int i, j, out;
648 av_log(s, AV_LOG_WARNING,
649 "Found invalid index entries, clearing the index.\n");
650 for (i = 0; i < s->nb_streams; i++) {
651 AVStream *st = s->streams[i];
652 /* Remove all index entries that point to >= pos */
653 out = 0;
654 for (j = 0; j < st->nb_index_entries; j++)
655 if (st->index_entries[j].pos < pos)
656 st->index_entries[out++] = st->index_entries[j];
657 st->nb_index_entries = out;
658 }
659}
660
661static int amf_skip_tag(AVIOContext *pb, AMFDataType type)
662{
663 int nb = -1, ret, parse_name = 1;
664
665 switch (type) {
666 case AMF_DATA_TYPE_NUMBER:
667 avio_skip(pb, 8);
668 break;
669 case AMF_DATA_TYPE_BOOL:
670 avio_skip(pb, 1);
671 break;
672 case AMF_DATA_TYPE_STRING:
673 avio_skip(pb, avio_rb16(pb));
674 break;
675 case AMF_DATA_TYPE_ARRAY:
676 parse_name = 0;
677 case AMF_DATA_TYPE_MIXEDARRAY:
678 nb = avio_rb32(pb);
679 case AMF_DATA_TYPE_OBJECT:
680 while(!pb->eof_reached && (nb-- > 0 || type != AMF_DATA_TYPE_ARRAY)) {
681 if (parse_name) {
682 int size = avio_rb16(pb);
683 if (!size) {
684 avio_skip(pb, 1);
685 break;
686 }
687 avio_skip(pb, size);
688 }
689 if ((ret = amf_skip_tag(pb, avio_r8(pb))) < 0)
690 return ret;
691 }
692 break;
693 case AMF_DATA_TYPE_NULL:
694 case AMF_DATA_TYPE_OBJECT_END:
695 break;
696 default:
697 return AVERROR_INVALIDDATA;
698 }
699 return 0;
700}
701
702static int flv_data_packet(AVFormatContext *s, AVPacket *pkt,
703 int64_t dts, int64_t next)
704{
705 AVIOContext *pb = s->pb;
706 AVStream *st = NULL;
707 char buf[20];
708 int ret = AVERROR_INVALIDDATA;
709 int i, length = -1;
710
711 switch (avio_r8(pb)) {
712 case AMF_DATA_TYPE_MIXEDARRAY:
713 avio_seek(pb, 4, SEEK_CUR);
714 case AMF_DATA_TYPE_OBJECT:
715 break;
716 default:
717 goto skip;
718 }
719
720 while ((ret = amf_get_string(pb, buf, sizeof(buf))) > 0) {
721 AMFDataType type = avio_r8(pb);
722 if (type == AMF_DATA_TYPE_STRING && !strcmp(buf, "text")) {
723 length = avio_rb16(pb);
724 ret = av_get_packet(pb, pkt, length);
725 if (ret < 0)
726 goto skip;
727 else
728 break;
729 } else {
730 if ((ret = amf_skip_tag(pb, type)) < 0)
731 goto skip;
732 }
733 }
734
735 if (length < 0) {
736 ret = AVERROR_INVALIDDATA;
737 goto skip;
738 }
739
740 for (i = 0; i < s->nb_streams; i++) {
741 st = s->streams[i];
742 if (st->codec->codec_type == AVMEDIA_TYPE_DATA)
743 break;
744 }
745
746 if (i == s->nb_streams) {
747 st = create_stream(s, AVMEDIA_TYPE_DATA);
748 if (!st)
f6fa7814 749 return AVERROR(ENOMEM);
2ba45a60
DM		 750 st->codec->codec_id = AV_CODEC_ID_TEXT;
751 }
752
753 pkt->dts = dts;
754 pkt->pts = dts;
755 pkt->size = ret;
756
757 pkt->stream_index = st->index;
758 pkt->flags |= AV_PKT_FLAG_KEY;
759
760skip:
761 avio_seek(s->pb, next + 4, SEEK_SET);
762
763 return ret;
764}
765
766static int flv_read_packet(AVFormatContext *s, AVPacket *pkt)
767{
768 FLVContext *flv = s->priv_data;
769 int ret, i, type, size, flags;
770 int stream_type=-1;
771 int64_t next, pos, meta_pos;
772 int64_t dts, pts = AV_NOPTS_VALUE;
773 int av_uninit(channels);
774 int av_uninit(sample_rate);
775 AVStream *st = NULL;
776
777 /* pkt size is repeated at end. skip it */
778 for (;; avio_skip(s->pb, 4)) {
779 pos = avio_tell(s->pb);
780 type = (avio_r8(s->pb) & 0x1F);
781 size = avio_rb24(s->pb);
782 dts = avio_rb24(s->pb);
783 dts |= avio_r8(s->pb) << 24;
784 av_dlog(s, "type:%d, size:%d, dts:%"PRId64" pos:%"PRId64"\n", type, size, dts, avio_tell(s->pb));
785 if (avio_feof(s->pb))
786 return AVERROR_EOF;
787 avio_skip(s->pb, 3); /* stream id, always 0 */
788 flags = 0;
789
790 if (flv->validate_next < flv->validate_count) {
791 int64_t validate_pos = flv->validate_index[flv->validate_next].pos;
792 if (pos == validate_pos) {
793 if (FFABS(dts - flv->validate_index[flv->validate_next].dts) <=
794 VALIDATE_INDEX_TS_THRESH) {
795 flv->validate_next++;
796 } else {
797 clear_index_entries(s, validate_pos);
798 flv->validate_count = 0;
799 }
800 } else if (pos > validate_pos) {
801 clear_index_entries(s, validate_pos);
802 flv->validate_count = 0;
803 }
804 }
805
806 if (size == 0)
807 continue;
808
809 next = size + avio_tell(s->pb);
810
811 if (type == FLV_TAG_TYPE_AUDIO) {
812 stream_type = FLV_STREAM_TYPE_AUDIO;
813 flags = avio_r8(s->pb);
814 size--;
815 } else if (type == FLV_TAG_TYPE_VIDEO) {
816 stream_type = FLV_STREAM_TYPE_VIDEO;
817 flags = avio_r8(s->pb);
818 size--;
819 if ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_VIDEO_INFO_CMD)
820 goto skip;
821 } else if (type == FLV_TAG_TYPE_META) {
822 stream_type=FLV_STREAM_TYPE_DATA;
823 if (size > 13 + 1 + 4 && dts == 0) { // Header-type metadata stuff
824 meta_pos = avio_tell(s->pb);
0e279ba6 825 if (flv_read_metabody(s, next) <= 0) {
2ba45a60
DM		 826 goto skip;
827 }
828 avio_seek(s->pb, meta_pos, SEEK_SET);
829 }
830 } else {
831 av_log(s, AV_LOG_DEBUG,
832 "Skipping flv packet: type %d, size %d, flags %d.\n",
833 type, size, flags);
834skip:
835 avio_seek(s->pb, next, SEEK_SET);
836 continue;
837 }
838
839 /* skip empty data packets */
840 if (!size)
841 continue;
842
843 /* now find stream */
844 for (i = 0; i < s->nb_streams; i++) {
845 st = s->streams[i];
846 if (stream_type == FLV_STREAM_TYPE_AUDIO) {
847 if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO &&
848 (s->audio_codec_id || flv_same_audio_codec(st->codec, flags)))
849 break;
850 } else if (stream_type == FLV_STREAM_TYPE_VIDEO) {
851 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
852 (s->video_codec_id || flv_same_video_codec(st->codec, flags)))
853 break;
854 } else if (stream_type == FLV_STREAM_TYPE_DATA) {
855 if (st->codec->codec_type == AVMEDIA_TYPE_DATA)
856 break;
857 }
858 }
859 if (i == s->nb_streams) {
860 static const enum AVMediaType stream_types[] = {AVMEDIA_TYPE_VIDEO, AVMEDIA_TYPE_AUDIO, AVMEDIA_TYPE_DATA};
861 av_log(s, AV_LOG_WARNING, "Stream discovered after head already parsed\n");
862 st = create_stream(s, stream_types[stream_type]);
863 if (!st)
864 return AVERROR(ENOMEM);
865
866 }
867 av_dlog(s, "%d %X %d \n", stream_type, flags, st->discard);
868
869 if ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY ||
870 stream_type == FLV_STREAM_TYPE_AUDIO)
871 av_add_index_entry(st, pos, dts, size, 0, AVINDEX_KEYFRAME);
872
873 if ( (st->discard >= AVDISCARD_NONKEY && !((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY || (stream_type == FLV_STREAM_TYPE_AUDIO)))
874 ||(st->discard >= AVDISCARD_BIDIR && ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_DISP_INTER && (stream_type == FLV_STREAM_TYPE_VIDEO)))
875 || st->discard >= AVDISCARD_ALL
876 ) {
877 avio_seek(s->pb, next, SEEK_SET);
878 continue;
879 }
880 break;
881 }
882
883 // if not streamed and no duration from metadata then seek to end to find
884 // the duration from the timestamps
885 if (s->pb->seekable && (!s->duration || s->duration == AV_NOPTS_VALUE) && !flv->searched_for_end) {
886 int size;
887 const int64_t pos = avio_tell(s->pb);
f6fa7814
DM		 888 // Read the last 4 bytes of the file, this should be the size of the
889 // previous FLV tag. Use the timestamp of its payload as duration.
2ba45a60
DM		 890 int64_t fsize = avio_size(s->pb);
891retry_duration:
892 avio_seek(s->pb, fsize - 4, SEEK_SET);
893 size = avio_rb32(s->pb);
f6fa7814
DM		 894 // Seek to the start of the last FLV tag at position (fsize - 4 - size)
895 // but skip the byte indicating the type.
2ba45a60
DM		 896 avio_seek(s->pb, fsize - 3 - size, SEEK_SET);
897 if (size == avio_rb24(s->pb) + 11) {
898 uint32_t ts = avio_rb24(s->pb);
899 ts |= avio_r8(s->pb) << 24;
900 if (ts)
901 s->duration = ts * (int64_t)AV_TIME_BASE / 1000;
902 else if (fsize >= 8 && fsize - 8 >= size) {
903 fsize -= size+4;
904 goto retry_duration;
905 }
906 }
907
908 avio_seek(s->pb, pos, SEEK_SET);
909 flv->searched_for_end = 1;
910 }
911
912 if (stream_type == FLV_STREAM_TYPE_AUDIO) {
913 int bits_per_coded_sample;
914 channels = (flags & FLV_AUDIO_CHANNEL_MASK) == FLV_STEREO ? 2 : 1;
915 sample_rate = 44100 << ((flags & FLV_AUDIO_SAMPLERATE_MASK) >>
916 FLV_AUDIO_SAMPLERATE_OFFSET) >> 3;
917 bits_per_coded_sample = (flags & FLV_AUDIO_SAMPLESIZE_MASK) ? 16 : 8;
918 if (!st->codec->channels || !st->codec->sample_rate ||
919 !st->codec->bits_per_coded_sample) {
920 st->codec->channels = channels;
921 st->codec->channel_layout = channels == 1
922 ? AV_CH_LAYOUT_MONO
923 : AV_CH_LAYOUT_STEREO;
924 st->codec->sample_rate = sample_rate;
925 st->codec->bits_per_coded_sample = bits_per_coded_sample;
926 }
927 if (!st->codec->codec_id) {
928 flv_set_audio_codec(s, st, st->codec,
929 flags & FLV_AUDIO_CODECID_MASK);
930 flv->last_sample_rate =
931 sample_rate = st->codec->sample_rate;
932 flv->last_channels =
933 channels = st->codec->channels;
934 } else {
935 AVCodecContext ctx = {0};
936 ctx.sample_rate = sample_rate;
f6fa7814 937 ctx.bits_per_coded_sample = bits_per_coded_sample;
2ba45a60
DM		 938 flv_set_audio_codec(s, st, &ctx, flags & FLV_AUDIO_CODECID_MASK);
939 sample_rate = ctx.sample_rate;
940 }
941 } else if (stream_type == FLV_STREAM_TYPE_VIDEO) {
942 size -= flv_set_video_codec(s, st, flags & FLV_VIDEO_CODECID_MASK, 1);
943 }
944
945 if (st->codec->codec_id == AV_CODEC_ID_AAC ||
946 st->codec->codec_id == AV_CODEC_ID_H264 ||
947 st->codec->codec_id == AV_CODEC_ID_MPEG4) {
948 int type = avio_r8(s->pb);
949 size--;
950 if (st->codec->codec_id == AV_CODEC_ID_H264 || st->codec->codec_id == AV_CODEC_ID_MPEG4) {
951 // sign extension
952 int32_t cts = (avio_rb24(s->pb) + 0xff800000) ^ 0xff800000;
953 pts = dts + cts;
954 if (cts < 0) { // dts might be wrong
955 if (!flv->wrong_dts)
956 av_log(s, AV_LOG_WARNING,
957 "Negative cts, previous timestamps might be wrong.\n");
958 flv->wrong_dts = 1;
959 } else if (FFABS(dts - pts) > 1000*60*15) {
960 av_log(s, AV_LOG_WARNING,
961 "invalid timestamps %"PRId64" %"PRId64"\n", dts, pts);
962 dts = pts = AV_NOPTS_VALUE;
963 }
964 }
965 if (type == 0 && (!st->codec->extradata || st->codec->codec_id == AV_CODEC_ID_AAC ||
966 st->codec->codec_id == AV_CODEC_ID_H264)) {
967 AVDictionaryEntry *t;
968
969 if (st->codec->extradata) {
970 if ((ret = flv_queue_extradata(flv, s->pb, stream_type, size)) < 0)
971 return ret;
972 ret = AVERROR(EAGAIN);
973 goto leave;
974 }
975 if ((ret = flv_get_extradata(s, st, size)) < 0)
976 return ret;
977
978 /* Workaround for buggy Omnia A/XE encoder */
979 t = av_dict_get(s->metadata, "Encoder", NULL, 0);
980 if (st->codec->codec_id == AV_CODEC_ID_AAC && t && !strcmp(t->value, "Omnia A/XE"))
981 st->codec->extradata_size = 2;
982
983 if (st->codec->codec_id == AV_CODEC_ID_AAC && 0) {
984 MPEG4AudioConfig cfg;
985
986 if (avpriv_mpeg4audio_get_config(&cfg, st->codec->extradata,
987 st->codec->extradata_size * 8, 1) >= 0) {
988 st->codec->channels = cfg.channels;
989 st->codec->channel_layout = 0;
990 if (cfg.ext_sample_rate)
991 st->codec->sample_rate = cfg.ext_sample_rate;
992 else
993 st->codec->sample_rate = cfg.sample_rate;
994 av_dlog(s, "mp4a config channels %d sample rate %d\n",
995 st->codec->channels, st->codec->sample_rate);
996 }
997 }
998
999 ret = AVERROR(EAGAIN);
1000 goto leave;
1001 }
1002 }
1003
1004 /* skip empty data packets */
1005 if (!size) {
1006 ret = AVERROR(EAGAIN);
1007 goto leave;
1008 }
1009
1010 ret = av_get_packet(s->pb, pkt, size);
1011 if (ret < 0)
1012 return ret;
1013 pkt->dts = dts;
1014 pkt->pts = pts == AV_NOPTS_VALUE ? dts : pts;
1015 pkt->stream_index = st->index;
1016 if (flv->new_extradata[stream_type]) {
1017 uint8_t *side = av_packet_new_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA,
1018 flv->new_extradata_size[stream_type]);
1019 if (side) {
1020 memcpy(side, flv->new_extradata[stream_type],
1021 flv->new_extradata_size[stream_type]);
1022 av_freep(&flv->new_extradata[stream_type]);
1023 flv->new_extradata_size[stream_type] = 0;
1024 }
1025 }
1026 if (stream_type == FLV_STREAM_TYPE_AUDIO &&
1027 (sample_rate != flv->last_sample_rate ||
1028 channels != flv->last_channels)) {
1029 flv->last_sample_rate = sample_rate;
1030 flv->last_channels = channels;
1031 ff_add_param_change(pkt, channels, 0, sample_rate, 0, 0);
1032 }
1033
1034 if ( stream_type == FLV_STREAM_TYPE_AUDIO ||
1035 ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY) ||
1036 stream_type == FLV_STREAM_TYPE_DATA)
1037 pkt->flags |= AV_PKT_FLAG_KEY;
1038
1039leave:
1040 avio_skip(s->pb, 4);
1041 return ret;
1042}
1043
1044static int flv_read_seek(AVFormatContext *s, int stream_index,
1045 int64_t ts, int flags)
1046{
1047 FLVContext *flv = s->priv_data;
1048 flv->validate_count = 0;
1049 return avio_seek_time(s->pb, stream_index, ts, flags);
1050}
1051
1052#define OFFSET(x) offsetof(FLVContext, x)
1053#define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM
1054static const AVOption options[] = {
1055 { "flv_metadata", "Allocate streams according to the onMetaData array", OFFSET(trust_metadata), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VD },
1056 { NULL }
1057};
1058
1059static const AVClass flv_class = {
1060 .class_name = "flvdec",
1061 .item_name = av_default_item_name,
1062 .option = options,
1063 .version = LIBAVUTIL_VERSION_INT,
1064};
1065
1066AVInputFormat ff_flv_demuxer = {
1067 .name = "flv",
1068 .long_name = NULL_IF_CONFIG_SMALL("FLV (Flash Video)"),
1069 .priv_data_size = sizeof(FLVContext),
1070 .read_probe = flv_probe,
1071 .read_header = flv_read_header,
1072 .read_packet = flv_read_packet,
1073 .read_seek = flv_read_seek,
1074 .read_close = flv_read_close,
1075 .extensions = "flv",
1076 .priv_class = &flv_class,
1077};
1078
1079static const AVClass live_flv_class = {
1080 .class_name = "live_flvdec",
1081 .item_name = av_default_item_name,
1082 .option = options,
1083 .version = LIBAVUTIL_VERSION_INT,
1084};
1085
1086AVInputFormat ff_live_flv_demuxer = {
1087 .name = "live_flv",
1088 .long_name = NULL_IF_CONFIG_SMALL("live RTMP FLV (Flash Video)"),
1089 .priv_data_size = sizeof(FLVContext),
1090 .read_probe = live_flv_probe,
1091 .read_header = flv_read_header,
1092 .read_packet = flv_read_packet,
1093 .read_seek = flv_read_seek,
1094 .read_close = flv_read_close,
1095 .extensions = "flv",
1096 .priv_class = &live_flv_class,
1097 .flags = AVFMT_TS_DISCONT
1098};
ffmpeg Piment Noir Debian package repository