3 * Copyright (c) 2003 The FFmpeg Project
5 * This demuxer will generate a 1 byte extradata for VP6F content.
7 * - upper 4 bits: difference between encoded width and visible width
8 * - lower 4 bits: difference between encoded height and visible height
10 * This file is part of FFmpeg.
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.
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.
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
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"
37 #include "avio_internal.h"
40 #define VALIDATE_INDEX_TS_THRESH 2500
42 #define RESYNC_BUFFER_SIZE (1<<20)
44 typedef struct FLVContext {
45 const AVClass *class; ///< Class for private options.
46 int trust_metadata; ///< configure streams according onMetaData
47 int trust_datasize; ///< trust data size of FLVTag
48 int dump_full_metadata; ///< Dump full metadata of the onMetadata
49 int wrong_dts; ///< wrong dts due to negative cts
50 uint8_t *new_extradata[FLV_STREAM_TYPE_NB];
51 int new_extradata_size[FLV_STREAM_TYPE_NB];
62 uint8_t resync_buffer[2*RESYNC_BUFFER_SIZE];
67 int last_keyframe_stream_index;
69 int64_t video_bit_rate;
70 int64_t audio_bit_rate;
71 int64_t *keyframe_times;
72 int64_t *keyframe_filepositions;
77 static int probe(AVProbeData *p, int live)
79 const uint8_t *d = p->buf;
80 unsigned offset = AV_RB32(d + 5);
85 d[3] < 5 && d[5] == 0 &&
86 offset + 100 < p->buf_size &&
88 int is_live = !memcmp(d + offset + 40, "NGINX RTMP", 10);
91 return AVPROBE_SCORE_MAX;
96 static int flv_probe(AVProbeData *p)
101 static int live_flv_probe(AVProbeData *p)
106 static void add_keyframes_index(AVFormatContext *s)
108 FLVContext *flv = s->priv_data;
109 AVStream *stream = NULL;
112 if (flv->last_keyframe_stream_index < 0) {
113 av_log(s, AV_LOG_DEBUG, "keyframe stream hasn't been created\n");
117 av_assert0(flv->last_keyframe_stream_index <= s->nb_streams);
118 stream = s->streams[flv->last_keyframe_stream_index];
120 if (stream->nb_index_entries == 0) {
121 for (i = 0; i < flv->keyframe_count; i++) {
122 av_log(s, AV_LOG_TRACE, "keyframe filepositions = %"PRId64" times = %"PRId64"\n",
123 flv->keyframe_filepositions[i], flv->keyframe_times[i] * 1000);
124 av_add_index_entry(stream, flv->keyframe_filepositions[i],
125 flv->keyframe_times[i] * 1000, 0, 0, AVINDEX_KEYFRAME);
128 av_log(s, AV_LOG_WARNING, "Skipping duplicate index\n");
130 if (stream->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
131 av_freep(&flv->keyframe_times);
132 av_freep(&flv->keyframe_filepositions);
133 flv->keyframe_count = 0;
137 static AVStream *create_stream(AVFormatContext *s, int codec_type)
139 FLVContext *flv = s->priv_data;
140 AVStream *st = avformat_new_stream(s, NULL);
143 st->codecpar->codec_type = codec_type;
144 if (s->nb_streams>=3 ||( s->nb_streams==2
145 && s->streams[0]->codecpar->codec_type != AVMEDIA_TYPE_SUBTITLE
146 && s->streams[1]->codecpar->codec_type != AVMEDIA_TYPE_SUBTITLE))
147 s->ctx_flags &= ~AVFMTCTX_NOHEADER;
148 if (codec_type == AVMEDIA_TYPE_AUDIO) {
149 st->codecpar->bit_rate = flv->audio_bit_rate;
150 flv->missing_streams &= ~FLV_HEADER_FLAG_HASAUDIO;
152 if (codec_type == AVMEDIA_TYPE_VIDEO) {
153 st->codecpar->bit_rate = flv->video_bit_rate;
154 flv->missing_streams &= ~FLV_HEADER_FLAG_HASVIDEO;
155 st->avg_frame_rate = flv->framerate;
159 avpriv_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
160 flv->last_keyframe_stream_index = s->nb_streams - 1;
161 add_keyframes_index(s);
165 static int flv_same_audio_codec(AVCodecParameters *apar, int flags)
167 int bits_per_coded_sample = (flags & FLV_AUDIO_SAMPLESIZE_MASK) ? 16 : 8;
168 int flv_codecid = flags & FLV_AUDIO_CODECID_MASK;
171 if (!apar->codec_id && !apar->codec_tag)
174 if (apar->bits_per_coded_sample != bits_per_coded_sample)
177 switch (flv_codecid) {
178 // no distinction between S16 and S8 PCM codec flags
179 case FLV_CODECID_PCM:
180 codec_id = bits_per_coded_sample == 8
183 : AV_CODEC_ID_PCM_S16BE;
185 : AV_CODEC_ID_PCM_S16LE;
187 return codec_id == apar->codec_id;
188 case FLV_CODECID_PCM_LE:
189 codec_id = bits_per_coded_sample == 8
191 : AV_CODEC_ID_PCM_S16LE;
192 return codec_id == apar->codec_id;
193 case FLV_CODECID_AAC:
194 return apar->codec_id == AV_CODEC_ID_AAC;
195 case FLV_CODECID_ADPCM:
196 return apar->codec_id == AV_CODEC_ID_ADPCM_SWF;
197 case FLV_CODECID_SPEEX:
198 return apar->codec_id == AV_CODEC_ID_SPEEX;
199 case FLV_CODECID_MP3:
200 return apar->codec_id == AV_CODEC_ID_MP3;
201 case FLV_CODECID_NELLYMOSER_8KHZ_MONO:
202 case FLV_CODECID_NELLYMOSER_16KHZ_MONO:
203 case FLV_CODECID_NELLYMOSER:
204 return apar->codec_id == AV_CODEC_ID_NELLYMOSER;
205 case FLV_CODECID_PCM_MULAW:
206 return apar->sample_rate == 8000 &&
207 apar->codec_id == AV_CODEC_ID_PCM_MULAW;
208 case FLV_CODECID_PCM_ALAW:
209 return apar->sample_rate == 8000 &&
210 apar->codec_id == AV_CODEC_ID_PCM_ALAW;
212 return apar->codec_tag == (flv_codecid >> FLV_AUDIO_CODECID_OFFSET);
216 static void flv_set_audio_codec(AVFormatContext *s, AVStream *astream,
217 AVCodecParameters *apar, int flv_codecid)
219 switch (flv_codecid) {
220 // no distinction between S16 and S8 PCM codec flags
221 case FLV_CODECID_PCM:
222 apar->codec_id = apar->bits_per_coded_sample == 8
225 : AV_CODEC_ID_PCM_S16BE;
227 : AV_CODEC_ID_PCM_S16LE;
230 case FLV_CODECID_PCM_LE:
231 apar->codec_id = apar->bits_per_coded_sample == 8
233 : AV_CODEC_ID_PCM_S16LE;
235 case FLV_CODECID_AAC:
236 apar->codec_id = AV_CODEC_ID_AAC;
238 case FLV_CODECID_ADPCM:
239 apar->codec_id = AV_CODEC_ID_ADPCM_SWF;
241 case FLV_CODECID_SPEEX:
242 apar->codec_id = AV_CODEC_ID_SPEEX;
243 apar->sample_rate = 16000;
245 case FLV_CODECID_MP3:
246 apar->codec_id = AV_CODEC_ID_MP3;
247 astream->need_parsing = AVSTREAM_PARSE_FULL;
249 case FLV_CODECID_NELLYMOSER_8KHZ_MONO:
250 // in case metadata does not otherwise declare samplerate
251 apar->sample_rate = 8000;
252 apar->codec_id = AV_CODEC_ID_NELLYMOSER;
254 case FLV_CODECID_NELLYMOSER_16KHZ_MONO:
255 apar->sample_rate = 16000;
256 apar->codec_id = AV_CODEC_ID_NELLYMOSER;
258 case FLV_CODECID_NELLYMOSER:
259 apar->codec_id = AV_CODEC_ID_NELLYMOSER;
261 case FLV_CODECID_PCM_MULAW:
262 apar->sample_rate = 8000;
263 apar->codec_id = AV_CODEC_ID_PCM_MULAW;
265 case FLV_CODECID_PCM_ALAW:
266 apar->sample_rate = 8000;
267 apar->codec_id = AV_CODEC_ID_PCM_ALAW;
270 avpriv_request_sample(s, "Audio codec (%x)",
271 flv_codecid >> FLV_AUDIO_CODECID_OFFSET);
272 apar->codec_tag = flv_codecid >> FLV_AUDIO_CODECID_OFFSET;
276 static int flv_same_video_codec(AVCodecParameters *vpar, int flags)
278 int flv_codecid = flags & FLV_VIDEO_CODECID_MASK;
280 if (!vpar->codec_id && !vpar->codec_tag)
283 switch (flv_codecid) {
284 case FLV_CODECID_H263:
285 return vpar->codec_id == AV_CODEC_ID_FLV1;
286 case FLV_CODECID_SCREEN:
287 return vpar->codec_id == AV_CODEC_ID_FLASHSV;
288 case FLV_CODECID_SCREEN2:
289 return vpar->codec_id == AV_CODEC_ID_FLASHSV2;
290 case FLV_CODECID_VP6:
291 return vpar->codec_id == AV_CODEC_ID_VP6F;
292 case FLV_CODECID_VP6A:
293 return vpar->codec_id == AV_CODEC_ID_VP6A;
294 case FLV_CODECID_H264:
295 return vpar->codec_id == AV_CODEC_ID_H264;
297 return vpar->codec_tag == flv_codecid;
301 static int flv_set_video_codec(AVFormatContext *s, AVStream *vstream,
302 int flv_codecid, int read)
305 AVCodecParameters *par = vstream->codecpar;
306 enum AVCodecID old_codec_id = vstream->codecpar->codec_id;
307 switch (flv_codecid) {
308 case FLV_CODECID_H263:
309 par->codec_id = AV_CODEC_ID_FLV1;
311 case FLV_CODECID_REALH263:
312 par->codec_id = AV_CODEC_ID_H263;
313 break; // Really mean it this time
314 case FLV_CODECID_SCREEN:
315 par->codec_id = AV_CODEC_ID_FLASHSV;
317 case FLV_CODECID_SCREEN2:
318 par->codec_id = AV_CODEC_ID_FLASHSV2;
320 case FLV_CODECID_VP6:
321 par->codec_id = AV_CODEC_ID_VP6F;
322 case FLV_CODECID_VP6A:
323 if (flv_codecid == FLV_CODECID_VP6A)
324 par->codec_id = AV_CODEC_ID_VP6A;
326 if (par->extradata_size != 1) {
327 ff_alloc_extradata(par, 1);
330 par->extradata[0] = avio_r8(s->pb);
334 ret = 1; // 1 byte body size adjustment for flv_read_packet()
336 case FLV_CODECID_H264:
337 par->codec_id = AV_CODEC_ID_H264;
338 vstream->need_parsing = AVSTREAM_PARSE_HEADERS;
339 ret = 3; // not 4, reading packet type will consume one byte
341 case FLV_CODECID_MPEG4:
342 par->codec_id = AV_CODEC_ID_MPEG4;
346 avpriv_request_sample(s, "Video codec (%x)", flv_codecid);
347 par->codec_tag = flv_codecid;
350 if (!vstream->internal->need_context_update && par->codec_id != old_codec_id) {
351 avpriv_request_sample(s, "Changing the codec id midstream");
352 return AVERROR_PATCHWELCOME;
358 static int amf_get_string(AVIOContext *ioc, char *buffer, int buffsize)
360 int length = avio_rb16(ioc);
361 if (length >= buffsize) {
362 avio_skip(ioc, length);
366 avio_read(ioc, buffer, length);
368 buffer[length] = '\0';
373 static int parse_keyframes_index(AVFormatContext *s, AVIOContext *ioc, int64_t max_pos)
375 FLVContext *flv = s->priv_data;
376 unsigned int timeslen = 0, fileposlen = 0, i;
378 int64_t *times = NULL;
379 int64_t *filepositions = NULL;
380 int ret = AVERROR(ENOSYS);
381 int64_t initial_pos = avio_tell(ioc);
383 if (flv->keyframe_count > 0) {
384 av_log(s, AV_LOG_DEBUG, "keyframes have been paresed\n");
387 av_assert0(!flv->keyframe_times);
388 av_assert0(!flv->keyframe_filepositions);
390 if (s->flags & AVFMT_FLAG_IGNIDX)
393 while (avio_tell(ioc) < max_pos - 2 &&
394 amf_get_string(ioc, str_val, sizeof(str_val)) > 0) {
395 int64_t **current_array;
396 unsigned int arraylen;
398 // Expect array object in context
399 if (avio_r8(ioc) != AMF_DATA_TYPE_ARRAY)
402 arraylen = avio_rb32(ioc);
406 if (!strcmp(KEYFRAMES_TIMESTAMP_TAG , str_val) && !times) {
407 current_array = ×
409 } else if (!strcmp(KEYFRAMES_BYTEOFFSET_TAG, str_val) &&
411 current_array = &filepositions;
412 fileposlen = arraylen;
414 // unexpected metatag inside keyframes, will not use such
415 // metadata for indexing
418 if (!(*current_array = av_mallocz(sizeof(**current_array) * arraylen))) {
419 ret = AVERROR(ENOMEM);
423 for (i = 0; i < arraylen && avio_tell(ioc) < max_pos - 1; i++) {
424 if (avio_r8(ioc) != AMF_DATA_TYPE_NUMBER)
426 current_array[0][i] = av_int2double(avio_rb64(ioc));
428 if (times && filepositions) {
429 // All done, exiting at a position allowing amf_parse_object
430 // to finish parsing the object
436 if (timeslen == fileposlen && fileposlen>1 && max_pos <= filepositions[0]) {
437 for (i = 0; i < FFMIN(2,fileposlen); i++) {
438 flv->validate_index[i].pos = filepositions[i];
439 flv->validate_index[i].dts = times[i] * 1000;
440 flv->validate_count = i + 1;
442 flv->keyframe_times = times;
443 flv->keyframe_filepositions = filepositions;
444 flv->keyframe_count = timeslen;
446 filepositions = NULL;
449 av_log(s, AV_LOG_WARNING, "Invalid keyframes object, skipping.\n");
454 av_freep(&filepositions);
455 avio_seek(ioc, initial_pos, SEEK_SET);
459 static int amf_parse_object(AVFormatContext *s, AVStream *astream,
460 AVStream *vstream, const char *key,
461 int64_t max_pos, int depth)
463 AVCodecParameters *apar, *vpar;
464 FLVContext *flv = s->priv_data;
466 AMFDataType amf_type;
472 amf_type = avio_r8(ioc);
475 case AMF_DATA_TYPE_NUMBER:
476 num_val = av_int2double(avio_rb64(ioc));
478 case AMF_DATA_TYPE_BOOL:
479 num_val = avio_r8(ioc);
481 case AMF_DATA_TYPE_STRING:
482 if (amf_get_string(ioc, str_val, sizeof(str_val)) < 0) {
483 av_log(s, AV_LOG_ERROR, "AMF_DATA_TYPE_STRING parsing failed\n");
487 case AMF_DATA_TYPE_OBJECT:
489 (ioc->seekable & AVIO_SEEKABLE_NORMAL) &&
490 !strcmp(KEYFRAMES_TAG, key) && depth == 1)
491 if (parse_keyframes_index(s, ioc,
493 av_log(s, AV_LOG_ERROR, "Keyframe index parsing failed\n");
495 add_keyframes_index(s);
496 while (avio_tell(ioc) < max_pos - 2 &&
497 amf_get_string(ioc, str_val, sizeof(str_val)) > 0)
498 if (amf_parse_object(s, astream, vstream, str_val, max_pos,
500 return -1; // if we couldn't skip, bomb out.
501 if (avio_r8(ioc) != AMF_END_OF_OBJECT) {
502 av_log(s, AV_LOG_ERROR, "Missing AMF_END_OF_OBJECT in AMF_DATA_TYPE_OBJECT\n");
506 case AMF_DATA_TYPE_NULL:
507 case AMF_DATA_TYPE_UNDEFINED:
508 case AMF_DATA_TYPE_UNSUPPORTED:
509 break; // these take up no additional space
510 case AMF_DATA_TYPE_MIXEDARRAY:
513 avio_skip(ioc, 4); // skip 32-bit max array index
514 while (avio_tell(ioc) < max_pos - 2 &&
515 amf_get_string(ioc, str_val, sizeof(str_val)) > 0)
516 // this is the only case in which we would want a nested
517 // parse to not skip over the object
518 if (amf_parse_object(s, astream, vstream, str_val, max_pos,
522 if (v != AMF_END_OF_OBJECT) {
523 av_log(s, AV_LOG_ERROR, "Missing AMF_END_OF_OBJECT in AMF_DATA_TYPE_MIXEDARRAY, found %d\n", v);
528 case AMF_DATA_TYPE_ARRAY:
530 unsigned int arraylen, i;
532 arraylen = avio_rb32(ioc);
533 for (i = 0; i < arraylen && avio_tell(ioc) < max_pos - 1; i++)
534 if (amf_parse_object(s, NULL, NULL, NULL, max_pos,
536 return -1; // if we couldn't skip, bomb out.
539 case AMF_DATA_TYPE_DATE:
540 avio_skip(ioc, 8 + 2); // timestamp (double) and UTC offset (int16)
542 default: // unsupported type, we couldn't skip
543 av_log(s, AV_LOG_ERROR, "unsupported amf type %d\n", amf_type);
548 apar = astream ? astream->codecpar : NULL;
549 vpar = vstream ? vstream->codecpar : NULL;
551 // stream info doesn't live any deeper than the first object
553 if (amf_type == AMF_DATA_TYPE_NUMBER ||
554 amf_type == AMF_DATA_TYPE_BOOL) {
555 if (!strcmp(key, "duration"))
556 s->duration = num_val * AV_TIME_BASE;
557 else if (!strcmp(key, "videodatarate") &&
558 0 <= (int)(num_val * 1024.0))
559 flv->video_bit_rate = num_val * 1024.0;
560 else if (!strcmp(key, "audiodatarate") &&
561 0 <= (int)(num_val * 1024.0))
562 flv->audio_bit_rate = num_val * 1024.0;
563 else if (!strcmp(key, "datastream")) {
564 AVStream *st = create_stream(s, AVMEDIA_TYPE_SUBTITLE);
566 return AVERROR(ENOMEM);
567 st->codecpar->codec_id = AV_CODEC_ID_TEXT;
568 } else if (!strcmp(key, "framerate")) {
569 flv->framerate = av_d2q(num_val, 1000);
571 vstream->avg_frame_rate = flv->framerate;
572 } else if (flv->trust_metadata) {
573 if (!strcmp(key, "videocodecid") && vpar) {
574 int ret = flv_set_video_codec(s, vstream, num_val, 0);
577 } else if (!strcmp(key, "audiocodecid") && apar) {
578 int id = ((int)num_val) << FLV_AUDIO_CODECID_OFFSET;
579 flv_set_audio_codec(s, astream, apar, id);
580 } else if (!strcmp(key, "audiosamplerate") && apar) {
581 apar->sample_rate = num_val;
582 } else if (!strcmp(key, "audiosamplesize") && apar) {
583 apar->bits_per_coded_sample = num_val;
584 } else if (!strcmp(key, "stereo") && apar) {
585 apar->channels = num_val + 1;
586 apar->channel_layout = apar->channels == 2 ?
587 AV_CH_LAYOUT_STEREO :
589 } else if (!strcmp(key, "width") && vpar) {
590 vpar->width = num_val;
591 } else if (!strcmp(key, "height") && vpar) {
592 vpar->height = num_val;
596 if (amf_type == AMF_DATA_TYPE_STRING) {
597 if (!strcmp(key, "encoder")) {
599 if (1 == sscanf(str_val, "Open Broadcaster Software v0.%d", &version)) {
600 if (version > 0 && version <= 655)
601 flv->broken_sizes = 1;
603 } else if (!strcmp(key, "metadatacreator")) {
604 if ( !strcmp (str_val, "MEGA")
605 || !strncmp(str_val, "FlixEngine", 10))
606 flv->broken_sizes = 1;
611 if (amf_type == AMF_DATA_TYPE_OBJECT && s->nb_streams == 1 &&
612 ((!apar && !strcmp(key, "audiocodecid")) ||
613 (!vpar && !strcmp(key, "videocodecid"))))
614 s->ctx_flags &= ~AVFMTCTX_NOHEADER; //If there is either audio/video missing, codecid will be an empty object
616 if ((!strcmp(key, "duration") ||
617 !strcmp(key, "filesize") ||
618 !strcmp(key, "width") ||
619 !strcmp(key, "height") ||
620 !strcmp(key, "videodatarate") ||
621 !strcmp(key, "framerate") ||
622 !strcmp(key, "videocodecid") ||
623 !strcmp(key, "audiodatarate") ||
624 !strcmp(key, "audiosamplerate") ||
625 !strcmp(key, "audiosamplesize") ||
626 !strcmp(key, "stereo") ||
627 !strcmp(key, "audiocodecid") ||
628 !strcmp(key, "datastream")) && !flv->dump_full_metadata)
631 s->event_flags |= AVFMT_EVENT_FLAG_METADATA_UPDATED;
632 if (amf_type == AMF_DATA_TYPE_BOOL) {
633 av_strlcpy(str_val, num_val > 0 ? "true" : "false",
635 av_dict_set(&s->metadata, key, str_val, 0);
636 } else if (amf_type == AMF_DATA_TYPE_NUMBER) {
637 snprintf(str_val, sizeof(str_val), "%.f", num_val);
638 av_dict_set(&s->metadata, key, str_val, 0);
639 } else if (amf_type == AMF_DATA_TYPE_STRING)
640 av_dict_set(&s->metadata, key, str_val, 0);
646 #define TYPE_ONTEXTDATA 1
647 #define TYPE_ONCAPTION 2
648 #define TYPE_ONCAPTIONINFO 3
649 #define TYPE_UNKNOWN 9
651 static int flv_read_metabody(AVFormatContext *s, int64_t next_pos)
653 FLVContext *flv = s->priv_data;
655 AVStream *stream, *astream, *vstream;
656 AVStream av_unused *dstream;
666 // first object needs to be "onMetaData" string
668 if (type != AMF_DATA_TYPE_STRING ||
669 amf_get_string(ioc, buffer, sizeof(buffer)) < 0)
672 if (!strcmp(buffer, "onTextData"))
673 return TYPE_ONTEXTDATA;
675 if (!strcmp(buffer, "onCaption"))
676 return TYPE_ONCAPTION;
678 if (!strcmp(buffer, "onCaptionInfo"))
679 return TYPE_ONCAPTIONINFO;
681 if (strcmp(buffer, "onMetaData") && strcmp(buffer, "onCuePoint")) {
682 av_log(s, AV_LOG_DEBUG, "Unknown type %s\n", buffer);
686 // find the streams now so that amf_parse_object doesn't need to do
687 // the lookup every time it is called.
688 for (i = 0; i < s->nb_streams; i++) {
689 stream = s->streams[i];
690 if (stream->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
692 flv->last_keyframe_stream_index = i;
693 } else if (stream->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
695 if (flv->last_keyframe_stream_index == -1)
696 flv->last_keyframe_stream_index = i;
698 else if (stream->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE)
702 // parse the second object (we want a mixed array)
703 if (amf_parse_object(s, astream, vstream, buffer, next_pos, 0) < 0)
709 static int flv_read_header(AVFormatContext *s)
712 FLVContext *flv = s->priv_data;
714 int pre_tag_size = 0;
717 flags = avio_r8(s->pb);
719 flv->missing_streams = flags & (FLV_HEADER_FLAG_HASVIDEO | FLV_HEADER_FLAG_HASAUDIO);
721 s->ctx_flags |= AVFMTCTX_NOHEADER;
723 offset = avio_rb32(s->pb);
724 avio_seek(s->pb, offset, SEEK_SET);
726 /* Annex E. The FLV File Format
729 * PreviousTagSize0 UI32 Always 0
731 pre_tag_size = avio_rb32(s->pb);
733 av_log(s, AV_LOG_WARNING, "Read FLV header error, input file is not a standard flv format, first PreviousTagSize0 always is 0\n");
737 flv->sum_flv_tag_size = 0;
738 flv->last_keyframe_stream_index = -1;
743 static int flv_read_close(AVFormatContext *s)
746 FLVContext *flv = s->priv_data;
747 for (i=0; i<FLV_STREAM_TYPE_NB; i++)
748 av_freep(&flv->new_extradata[i]);
749 av_freep(&flv->keyframe_times);
750 av_freep(&flv->keyframe_filepositions);
754 static int flv_get_extradata(AVFormatContext *s, AVStream *st, int size)
759 av_freep(&st->codecpar->extradata);
760 if (ff_get_extradata(s, st->codecpar, s->pb, size) < 0)
761 return AVERROR(ENOMEM);
762 st->internal->need_context_update = 1;
766 static int flv_queue_extradata(FLVContext *flv, AVIOContext *pb, int stream,
772 av_free(flv->new_extradata[stream]);
773 flv->new_extradata[stream] = av_mallocz(size +
774 AV_INPUT_BUFFER_PADDING_SIZE);
775 if (!flv->new_extradata[stream])
776 return AVERROR(ENOMEM);
777 flv->new_extradata_size[stream] = size;
778 avio_read(pb, flv->new_extradata[stream], size);
782 static void clear_index_entries(AVFormatContext *s, int64_t pos)
785 av_log(s, AV_LOG_WARNING,
786 "Found invalid index entries, clearing the index.\n");
787 for (i = 0; i < s->nb_streams; i++) {
788 AVStream *st = s->streams[i];
789 /* Remove all index entries that point to >= pos */
791 for (j = 0; j < st->nb_index_entries; j++)
792 if (st->index_entries[j].pos < pos)
793 st->index_entries[out++] = st->index_entries[j];
794 st->nb_index_entries = out;
798 static int amf_skip_tag(AVIOContext *pb, AMFDataType type)
800 int nb = -1, ret, parse_name = 1;
803 case AMF_DATA_TYPE_NUMBER:
806 case AMF_DATA_TYPE_BOOL:
809 case AMF_DATA_TYPE_STRING:
810 avio_skip(pb, avio_rb16(pb));
812 case AMF_DATA_TYPE_ARRAY:
814 case AMF_DATA_TYPE_MIXEDARRAY:
816 case AMF_DATA_TYPE_OBJECT:
817 while(!pb->eof_reached && (nb-- > 0 || type != AMF_DATA_TYPE_ARRAY)) {
819 int size = avio_rb16(pb);
826 if ((ret = amf_skip_tag(pb, avio_r8(pb))) < 0)
830 case AMF_DATA_TYPE_NULL:
831 case AMF_DATA_TYPE_OBJECT_END:
834 return AVERROR_INVALIDDATA;
839 static int flv_data_packet(AVFormatContext *s, AVPacket *pkt,
840 int64_t dts, int64_t next)
842 AVIOContext *pb = s->pb;
845 int ret = AVERROR_INVALIDDATA;
849 switch (avio_r8(pb)) {
850 case AMF_DATA_TYPE_ARRAY:
852 case AMF_DATA_TYPE_MIXEDARRAY:
853 avio_seek(pb, 4, SEEK_CUR);
854 case AMF_DATA_TYPE_OBJECT:
860 while (array || (ret = amf_get_string(pb, buf, sizeof(buf))) > 0) {
861 AMFDataType type = avio_r8(pb);
862 if (type == AMF_DATA_TYPE_STRING && (array || !strcmp(buf, "text"))) {
863 length = avio_rb16(pb);
864 ret = av_get_packet(pb, pkt, length);
870 if ((ret = amf_skip_tag(pb, type)) < 0)
876 ret = AVERROR_INVALIDDATA;
880 for (i = 0; i < s->nb_streams; i++) {
882 if (st->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE)
886 if (i == s->nb_streams) {
887 st = create_stream(s, AVMEDIA_TYPE_SUBTITLE);
889 return AVERROR(ENOMEM);
890 st->codecpar->codec_id = AV_CODEC_ID_TEXT;
897 pkt->stream_index = st->index;
898 pkt->flags |= AV_PKT_FLAG_KEY;
901 avio_seek(s->pb, next + 4, SEEK_SET);
906 static int resync(AVFormatContext *s)
908 FLVContext *flv = s->priv_data;
910 int64_t pos = avio_tell(s->pb);
912 for (i=0; !avio_feof(s->pb); i++) {
913 int j = i & (RESYNC_BUFFER_SIZE-1);
914 int j1 = j + RESYNC_BUFFER_SIZE;
915 flv->resync_buffer[j ] =
916 flv->resync_buffer[j1] = avio_r8(s->pb);
919 unsigned lsize2 = AV_RB32(flv->resync_buffer + j1 - 4);
920 if (lsize2 >= 11 && lsize2 + 8LL < FFMIN(i, RESYNC_BUFFER_SIZE)) {
921 unsigned size2 = AV_RB24(flv->resync_buffer + j1 - lsize2 + 1 - 4);
922 unsigned lsize1 = AV_RB32(flv->resync_buffer + j1 - lsize2 - 8);
923 if (lsize1 >= 11 && lsize1 + 8LL + lsize2 < FFMIN(i, RESYNC_BUFFER_SIZE)) {
924 unsigned size1 = AV_RB24(flv->resync_buffer + j1 - lsize1 + 1 - lsize2 - 8);
925 if (size1 == lsize1 - 11 && size2 == lsize2 - 11) {
926 avio_seek(s->pb, pos + i - lsize1 - lsize2 - 8, SEEK_SET);
936 static int flv_read_packet(AVFormatContext *s, AVPacket *pkt)
938 FLVContext *flv = s->priv_data;
939 int ret, i, size, flags;
940 enum FlvTagType type;
942 int64_t next, pos, meta_pos;
943 int64_t dts, pts = AV_NOPTS_VALUE;
944 int av_uninit(channels);
945 int av_uninit(sample_rate);
951 /* pkt size is repeated at end. skip it */
952 pos = avio_tell(s->pb);
953 type = (avio_r8(s->pb) & 0x1F);
955 size = avio_rb24(s->pb);
956 flv->sum_flv_tag_size += size + 11;
957 dts = avio_rb24(s->pb);
958 dts |= (unsigned)avio_r8(s->pb) << 24;
959 av_log(s, AV_LOG_TRACE, "type:%d, size:%d, last:%d, dts:%"PRId64" pos:%"PRId64"\n", type, size, last, dts, avio_tell(s->pb));
960 if (avio_feof(s->pb))
962 avio_skip(s->pb, 3); /* stream id, always 0 */
965 if (flv->validate_next < flv->validate_count) {
966 int64_t validate_pos = flv->validate_index[flv->validate_next].pos;
967 if (pos == validate_pos) {
968 if (FFABS(dts - flv->validate_index[flv->validate_next].dts) <=
969 VALIDATE_INDEX_TS_THRESH) {
970 flv->validate_next++;
972 clear_index_entries(s, validate_pos);
973 flv->validate_count = 0;
975 } else if (pos > validate_pos) {
976 clear_index_entries(s, validate_pos);
977 flv->validate_count = 0;
986 next = size + avio_tell(s->pb);
988 if (type == FLV_TAG_TYPE_AUDIO) {
989 stream_type = FLV_STREAM_TYPE_AUDIO;
990 flags = avio_r8(s->pb);
992 } else if (type == FLV_TAG_TYPE_VIDEO) {
993 stream_type = FLV_STREAM_TYPE_VIDEO;
994 flags = avio_r8(s->pb);
996 if ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_VIDEO_INFO_CMD)
998 } else if (type == FLV_TAG_TYPE_META) {
999 stream_type=FLV_STREAM_TYPE_DATA;
1000 if (size > 13 + 1 + 4) { // Header-type metadata stuff
1002 meta_pos = avio_tell(s->pb);
1003 type = flv_read_metabody(s, next);
1004 if (type == 0 && dts == 0 || type < 0 || type == TYPE_UNKNOWN) {
1005 if (type < 0 && flv->validate_count &&
1006 flv->validate_index[0].pos > next &&
1007 flv->validate_index[0].pos - 4 < next
1009 av_log(s, AV_LOG_WARNING, "Adjusting next position due to index mismatch\n");
1010 next = flv->validate_index[0].pos - 4;
1013 } else if (type == TYPE_ONTEXTDATA) {
1014 avpriv_request_sample(s, "OnTextData packet");
1015 return flv_data_packet(s, pkt, dts, next);
1016 } else if (type == TYPE_ONCAPTION) {
1017 return flv_data_packet(s, pkt, dts, next);
1019 avio_seek(s->pb, meta_pos, SEEK_SET);
1022 av_log(s, AV_LOG_DEBUG,
1023 "Skipping flv packet: type %d, size %d, flags %d.\n",
1026 if (avio_seek(s->pb, next, SEEK_SET) != next) {
1027 // This can happen if flv_read_metabody above read past
1028 // next, on a non-seekable input, and the preceding data has
1029 // been flushed out from the IO buffer.
1030 av_log(s, AV_LOG_ERROR, "Unable to seek to the next packet\n");
1031 return AVERROR_INVALIDDATA;
1037 /* skip empty data packets */
1043 /* now find stream */
1044 for (i = 0; i < s->nb_streams; i++) {
1046 if (stream_type == FLV_STREAM_TYPE_AUDIO) {
1047 if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO &&
1048 (s->audio_codec_id || flv_same_audio_codec(st->codecpar, flags)))
1050 } else if (stream_type == FLV_STREAM_TYPE_VIDEO) {
1051 if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO &&
1052 (s->video_codec_id || flv_same_video_codec(st->codecpar, flags)))
1054 } else if (stream_type == FLV_STREAM_TYPE_DATA) {
1055 if (st->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE)
1059 if (i == s->nb_streams) {
1060 static const enum AVMediaType stream_types[] = {AVMEDIA_TYPE_VIDEO, AVMEDIA_TYPE_AUDIO, AVMEDIA_TYPE_SUBTITLE};
1061 st = create_stream(s, stream_types[stream_type]);
1063 return AVERROR(ENOMEM);
1066 av_log(s, AV_LOG_TRACE, "%d %X %d \n", stream_type, flags, st->discard);
1068 if ((s->pb->seekable & AVIO_SEEKABLE_NORMAL) &&
1069 ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY ||
1070 stream_type == FLV_STREAM_TYPE_AUDIO))
1071 av_add_index_entry(st, pos, dts, size, 0, AVINDEX_KEYFRAME);
1073 if ( (st->discard >= AVDISCARD_NONKEY && !((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY || (stream_type == FLV_STREAM_TYPE_AUDIO)))
1074 ||(st->discard >= AVDISCARD_BIDIR && ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_DISP_INTER && (stream_type == FLV_STREAM_TYPE_VIDEO)))
1075 || st->discard >= AVDISCARD_ALL
1077 avio_seek(s->pb, next, SEEK_SET);
1082 // if not streamed and no duration from metadata then seek to end to find
1083 // the duration from the timestamps
1084 if ((s->pb->seekable & AVIO_SEEKABLE_NORMAL) &&
1085 (!s->duration || s->duration == AV_NOPTS_VALUE) &&
1086 !flv->searched_for_end) {
1088 const int64_t pos = avio_tell(s->pb);
1089 // Read the last 4 bytes of the file, this should be the size of the
1090 // previous FLV tag. Use the timestamp of its payload as duration.
1091 int64_t fsize = avio_size(s->pb);
1093 avio_seek(s->pb, fsize - 4, SEEK_SET);
1094 size = avio_rb32(s->pb);
1095 if (size > 0 && size < fsize) {
1096 // Seek to the start of the last FLV tag at position (fsize - 4 - size)
1097 // but skip the byte indicating the type.
1098 avio_seek(s->pb, fsize - 3 - size, SEEK_SET);
1099 if (size == avio_rb24(s->pb) + 11) {
1100 uint32_t ts = avio_rb24(s->pb);
1101 ts |= avio_r8(s->pb) << 24;
1103 s->duration = ts * (int64_t)AV_TIME_BASE / 1000;
1104 else if (fsize >= 8 && fsize - 8 >= size) {
1106 goto retry_duration;
1111 avio_seek(s->pb, pos, SEEK_SET);
1112 flv->searched_for_end = 1;
1115 if (stream_type == FLV_STREAM_TYPE_AUDIO) {
1116 int bits_per_coded_sample;
1117 channels = (flags & FLV_AUDIO_CHANNEL_MASK) == FLV_STEREO ? 2 : 1;
1118 sample_rate = 44100 << ((flags & FLV_AUDIO_SAMPLERATE_MASK) >>
1119 FLV_AUDIO_SAMPLERATE_OFFSET) >> 3;
1120 bits_per_coded_sample = (flags & FLV_AUDIO_SAMPLESIZE_MASK) ? 16 : 8;
1121 if (!st->codecpar->channels || !st->codecpar->sample_rate ||
1122 !st->codecpar->bits_per_coded_sample) {
1123 st->codecpar->channels = channels;
1124 st->codecpar->channel_layout = channels == 1
1126 : AV_CH_LAYOUT_STEREO;
1127 st->codecpar->sample_rate = sample_rate;
1128 st->codecpar->bits_per_coded_sample = bits_per_coded_sample;
1130 if (!st->codecpar->codec_id) {
1131 flv_set_audio_codec(s, st, st->codecpar,
1132 flags & FLV_AUDIO_CODECID_MASK);
1133 flv->last_sample_rate =
1134 sample_rate = st->codecpar->sample_rate;
1135 flv->last_channels =
1136 channels = st->codecpar->channels;
1138 AVCodecParameters *par = avcodec_parameters_alloc();
1140 ret = AVERROR(ENOMEM);
1143 par->sample_rate = sample_rate;
1144 par->bits_per_coded_sample = bits_per_coded_sample;
1145 flv_set_audio_codec(s, st, par, flags & FLV_AUDIO_CODECID_MASK);
1146 sample_rate = par->sample_rate;
1147 avcodec_parameters_free(&par);
1149 } else if (stream_type == FLV_STREAM_TYPE_VIDEO) {
1150 int ret = flv_set_video_codec(s, st, flags & FLV_VIDEO_CODECID_MASK, 1);
1154 } else if (stream_type == FLV_STREAM_TYPE_DATA) {
1155 st->codecpar->codec_id = AV_CODEC_ID_TEXT;
1158 if (st->codecpar->codec_id == AV_CODEC_ID_AAC ||
1159 st->codecpar->codec_id == AV_CODEC_ID_H264 ||
1160 st->codecpar->codec_id == AV_CODEC_ID_MPEG4) {
1161 int type = avio_r8(s->pb);
1165 ret = AVERROR_INVALIDDATA;
1169 if (st->codecpar->codec_id == AV_CODEC_ID_H264 || st->codecpar->codec_id == AV_CODEC_ID_MPEG4) {
1171 int32_t cts = (avio_rb24(s->pb) + 0xff800000) ^ 0xff800000;
1173 if (cts < 0) { // dts might be wrong
1174 if (!flv->wrong_dts)
1175 av_log(s, AV_LOG_WARNING,
1176 "Negative cts, previous timestamps might be wrong.\n");
1178 } else if (FFABS(dts - pts) > 1000*60*15) {
1179 av_log(s, AV_LOG_WARNING,
1180 "invalid timestamps %"PRId64" %"PRId64"\n", dts, pts);
1181 dts = pts = AV_NOPTS_VALUE;
1184 if (type == 0 && (!st->codecpar->extradata || st->codecpar->codec_id == AV_CODEC_ID_AAC ||
1185 st->codecpar->codec_id == AV_CODEC_ID_H264)) {
1186 AVDictionaryEntry *t;
1188 if (st->codecpar->extradata) {
1189 if ((ret = flv_queue_extradata(flv, s->pb, stream_type, size)) < 0)
1194 if ((ret = flv_get_extradata(s, st, size)) < 0)
1197 /* Workaround for buggy Omnia A/XE encoder */
1198 t = av_dict_get(s->metadata, "Encoder", NULL, 0);
1199 if (st->codecpar->codec_id == AV_CODEC_ID_AAC && t && !strcmp(t->value, "Omnia A/XE"))
1200 st->codecpar->extradata_size = 2;
1202 if (st->codecpar->codec_id == AV_CODEC_ID_AAC && 0) {
1203 MPEG4AudioConfig cfg;
1205 if (avpriv_mpeg4audio_get_config(&cfg, st->codecpar->extradata,
1206 st->codecpar->extradata_size * 8, 1) >= 0) {
1207 st->codecpar->channels = cfg.channels;
1208 st->codecpar->channel_layout = 0;
1209 if (cfg.ext_sample_rate)
1210 st->codecpar->sample_rate = cfg.ext_sample_rate;
1212 st->codecpar->sample_rate = cfg.sample_rate;
1213 av_log(s, AV_LOG_TRACE, "mp4a config channels %d sample rate %d\n",
1214 st->codecpar->channels, st->codecpar->sample_rate);
1223 /* skip empty data packets */
1229 ret = av_get_packet(s->pb, pkt, size);
1233 pkt->pts = pts == AV_NOPTS_VALUE ? dts : pts;
1234 pkt->stream_index = st->index;
1236 if (flv->new_extradata[stream_type]) {
1237 uint8_t *side = av_packet_new_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA,
1238 flv->new_extradata_size[stream_type]);
1240 memcpy(side, flv->new_extradata[stream_type],
1241 flv->new_extradata_size[stream_type]);
1242 av_freep(&flv->new_extradata[stream_type]);
1243 flv->new_extradata_size[stream_type] = 0;
1246 if (stream_type == FLV_STREAM_TYPE_AUDIO &&
1247 (sample_rate != flv->last_sample_rate ||
1248 channels != flv->last_channels)) {
1249 flv->last_sample_rate = sample_rate;
1250 flv->last_channels = channels;
1251 ff_add_param_change(pkt, channels, 0, sample_rate, 0, 0);
1254 if ( stream_type == FLV_STREAM_TYPE_AUDIO ||
1255 ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY) ||
1256 stream_type == FLV_STREAM_TYPE_DATA)
1257 pkt->flags |= AV_PKT_FLAG_KEY;
1260 last = avio_rb32(s->pb);
1261 if (!flv->trust_datasize) {
1262 if (last != orig_size + 11 && last != orig_size + 10 &&
1263 !avio_feof(s->pb) &&
1264 (last != orig_size || !last) && last != flv->sum_flv_tag_size &&
1265 !flv->broken_sizes) {
1266 av_log(s, AV_LOG_ERROR, "Packet mismatch %d %d %d\n", last, orig_size + 11, flv->sum_flv_tag_size);
1267 avio_seek(s->pb, pos + 1, SEEK_SET);
1269 av_packet_unref(pkt);
1278 static int flv_read_seek(AVFormatContext *s, int stream_index,
1279 int64_t ts, int flags)
1281 FLVContext *flv = s->priv_data;
1282 flv->validate_count = 0;
1283 return avio_seek_time(s->pb, stream_index, ts, flags);
1286 #define OFFSET(x) offsetof(FLVContext, x)
1287 #define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM
1288 static const AVOption options[] = {
1289 { "flv_metadata", "Allocate streams according to the onMetaData array", OFFSET(trust_metadata), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, VD },
1290 { "flv_full_metadata", "Dump full metadata of the onMetadata", OFFSET(dump_full_metadata), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, VD },
1291 { "flv_ignore_prevtag", "Ignore the Size of previous tag", OFFSET(trust_datasize), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, VD },
1292 { "missing_streams", "", OFFSET(missing_streams), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 0xFF, VD | AV_OPT_FLAG_EXPORT | AV_OPT_FLAG_READONLY },
1296 static const AVClass flv_class = {
1297 .class_name = "flvdec",
1298 .item_name = av_default_item_name,
1300 .version = LIBAVUTIL_VERSION_INT,
1303 AVInputFormat ff_flv_demuxer = {
1305 .long_name = NULL_IF_CONFIG_SMALL("FLV (Flash Video)"),
1306 .priv_data_size = sizeof(FLVContext),
1307 .read_probe = flv_probe,
1308 .read_header = flv_read_header,
1309 .read_packet = flv_read_packet,
1310 .read_seek = flv_read_seek,
1311 .read_close = flv_read_close,
1312 .extensions = "flv",
1313 .priv_class = &flv_class,
1316 static const AVClass live_flv_class = {
1317 .class_name = "live_flvdec",
1318 .item_name = av_default_item_name,
1320 .version = LIBAVUTIL_VERSION_INT,
1323 AVInputFormat ff_live_flv_demuxer = {
1325 .long_name = NULL_IF_CONFIG_SMALL("live RTMP FLV (Flash Video)"),
1326 .priv_data_size = sizeof(FLVContext),
1327 .read_probe = live_flv_probe,
1328 .read_header = flv_read_header,
1329 .read_packet = flv_read_packet,
1330 .read_seek = flv_read_seek,
1331 .read_close = flv_read_close,
1332 .extensions = "flv",
1333 .priv_class = &live_flv_class,
1334 .flags = AVFMT_TS_DISCONT