3 * Copyright (c) 2003 The Libav Project
5 * This demuxer will generate a 1 byte extradata for VP6F content.
7 * - upper 4bits: difference between encoded width and visible width
8 * - lower 4bits: difference between encoded height and visible height
10 * This file is part of Libav.
12 * Libav 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 * Libav 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 Libav; 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 KEYFRAMES_TAG "keyframes"
41 #define KEYFRAMES_TIMESTAMP_TAG "times"
42 #define KEYFRAMES_BYTEOFFSET_TAG "filepositions"
44 #define VALIDATE_INDEX_TS_THRESH 2500
47 const AVClass *class; ///< Class for private options.
48 int trust_metadata; ///< configure streams according onMetaData
49 int wrong_dts; ///< wrong dts due to negative cts
50 uint8_t *new_extradata[2];
51 int new_extradata_size[2];
62 static int flv_probe(AVProbeData *p)
70 d[3] < 5 && d[5] == 0 &&
72 return AVPROBE_SCORE_MAX;
77 static AVStream *create_stream(AVFormatContext *s, int codec_type)
79 AVStream *st = avformat_new_stream(s, NULL);
82 st->codec->codec_type = codec_type;
83 avpriv_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
87 static int flv_same_audio_codec(AVCodecContext *acodec, int flags)
89 int bits_per_coded_sample = (flags & FLV_AUDIO_SAMPLESIZE_MASK) ? 16 : 8;
90 int flv_codecid = flags & FLV_AUDIO_CODECID_MASK;
93 if (!acodec->codec_id && !acodec->codec_tag)
96 if (acodec->bits_per_coded_sample != bits_per_coded_sample)
99 switch (flv_codecid) {
100 // no distinction between S16 and S8 PCM codec flags
101 case FLV_CODECID_PCM:
102 codec_id = bits_per_coded_sample == 8
105 : AV_CODEC_ID_PCM_S16BE;
107 : AV_CODEC_ID_PCM_S16LE;
109 return codec_id == acodec->codec_id;
110 case FLV_CODECID_PCM_LE:
111 codec_id = bits_per_coded_sample == 8
113 : AV_CODEC_ID_PCM_S16LE;
114 return codec_id == acodec->codec_id;
115 case FLV_CODECID_AAC:
116 return acodec->codec_id == AV_CODEC_ID_AAC;
117 case FLV_CODECID_ADPCM:
118 return acodec->codec_id == AV_CODEC_ID_ADPCM_SWF;
119 case FLV_CODECID_SPEEX:
120 return acodec->codec_id == AV_CODEC_ID_SPEEX;
121 case FLV_CODECID_MP3:
122 return acodec->codec_id == AV_CODEC_ID_MP3;
123 case FLV_CODECID_NELLYMOSER_8KHZ_MONO:
124 case FLV_CODECID_NELLYMOSER_16KHZ_MONO:
125 case FLV_CODECID_NELLYMOSER:
126 return acodec->codec_id == AV_CODEC_ID_NELLYMOSER;
127 case FLV_CODECID_PCM_MULAW:
128 return acodec->sample_rate == 8000 &&
129 acodec->codec_id == AV_CODEC_ID_PCM_MULAW;
130 case FLV_CODECID_PCM_ALAW:
131 return acodec->sample_rate == 8000 &&
132 acodec->codec_id == AV_CODEC_ID_PCM_ALAW;
134 return acodec->codec_tag == (flv_codecid >> FLV_AUDIO_CODECID_OFFSET);
138 static void flv_set_audio_codec(AVFormatContext *s, AVStream *astream,
139 AVCodecContext *acodec, int flv_codecid)
141 switch (flv_codecid) {
142 // no distinction between S16 and S8 PCM codec flags
143 case FLV_CODECID_PCM:
144 acodec->codec_id = acodec->bits_per_coded_sample == 8
147 : AV_CODEC_ID_PCM_S16BE;
149 : AV_CODEC_ID_PCM_S16LE;
152 case FLV_CODECID_PCM_LE:
153 acodec->codec_id = acodec->bits_per_coded_sample == 8
155 : AV_CODEC_ID_PCM_S16LE;
157 case FLV_CODECID_AAC:
158 acodec->codec_id = AV_CODEC_ID_AAC;
160 case FLV_CODECID_ADPCM:
161 acodec->codec_id = AV_CODEC_ID_ADPCM_SWF;
163 case FLV_CODECID_SPEEX:
164 acodec->codec_id = AV_CODEC_ID_SPEEX;
165 acodec->sample_rate = 16000;
167 case FLV_CODECID_MP3:
168 acodec->codec_id = AV_CODEC_ID_MP3;
169 astream->need_parsing = AVSTREAM_PARSE_FULL;
171 case FLV_CODECID_NELLYMOSER_8KHZ_MONO:
172 // in case metadata does not otherwise declare samplerate
173 acodec->sample_rate = 8000;
174 acodec->codec_id = AV_CODEC_ID_NELLYMOSER;
176 case FLV_CODECID_NELLYMOSER_16KHZ_MONO:
177 acodec->sample_rate = 16000;
178 acodec->codec_id = AV_CODEC_ID_NELLYMOSER;
180 case FLV_CODECID_NELLYMOSER:
181 acodec->codec_id = AV_CODEC_ID_NELLYMOSER;
183 case FLV_CODECID_PCM_MULAW:
184 acodec->sample_rate = 8000;
185 acodec->codec_id = AV_CODEC_ID_PCM_MULAW;
187 case FLV_CODECID_PCM_ALAW:
188 acodec->sample_rate = 8000;
189 acodec->codec_id = AV_CODEC_ID_PCM_ALAW;
192 av_log(s, AV_LOG_INFO, "Unsupported audio codec (%x)\n",
193 flv_codecid >> FLV_AUDIO_CODECID_OFFSET);
194 acodec->codec_tag = flv_codecid >> FLV_AUDIO_CODECID_OFFSET;
198 static int flv_same_video_codec(AVCodecContext *vcodec, int flags)
200 int flv_codecid = flags & FLV_VIDEO_CODECID_MASK;
202 if (!vcodec->codec_id && !vcodec->codec_tag)
205 switch (flv_codecid) {
206 case FLV_CODECID_H263:
207 return vcodec->codec_id == AV_CODEC_ID_FLV1;
208 case FLV_CODECID_SCREEN:
209 return vcodec->codec_id == AV_CODEC_ID_FLASHSV;
210 case FLV_CODECID_SCREEN2:
211 return vcodec->codec_id == AV_CODEC_ID_FLASHSV2;
212 case FLV_CODECID_VP6:
213 return vcodec->codec_id == AV_CODEC_ID_VP6F;
214 case FLV_CODECID_VP6A:
215 return vcodec->codec_id == AV_CODEC_ID_VP6A;
216 case FLV_CODECID_H264:
217 return vcodec->codec_id == AV_CODEC_ID_H264;
219 return vcodec->codec_tag == flv_codecid;
223 static int flv_set_video_codec(AVFormatContext *s, AVStream *vstream,
224 int flv_codecid, int read)
226 AVCodecContext *vcodec = vstream->codec;
227 switch (flv_codecid) {
228 case FLV_CODECID_H263:
229 vcodec->codec_id = AV_CODEC_ID_FLV1;
231 case FLV_CODECID_SCREEN:
232 vcodec->codec_id = AV_CODEC_ID_FLASHSV;
234 case FLV_CODECID_SCREEN2:
235 vcodec->codec_id = AV_CODEC_ID_FLASHSV2;
237 case FLV_CODECID_VP6:
238 vcodec->codec_id = AV_CODEC_ID_VP6F;
239 case FLV_CODECID_VP6A:
240 if (flv_codecid == FLV_CODECID_VP6A)
241 vcodec->codec_id = AV_CODEC_ID_VP6A;
243 if (vcodec->extradata_size != 1) {
244 vcodec->extradata = av_malloc(1);
245 if (vcodec->extradata)
246 vcodec->extradata_size = 1;
248 if (vcodec->extradata)
249 vcodec->extradata[0] = avio_r8(s->pb);
253 return 1; // 1 byte body size adjustment for flv_read_packet()
254 case FLV_CODECID_H264:
255 vcodec->codec_id = AV_CODEC_ID_H264;
256 return 3; // not 4, reading packet type will consume one byte
258 av_log(s, AV_LOG_INFO, "Unsupported video codec (%x)\n", flv_codecid);
259 vcodec->codec_tag = flv_codecid;
265 static int amf_get_string(AVIOContext *ioc, char *buffer, int buffsize)
267 int length = avio_rb16(ioc);
268 if (length >= buffsize) {
269 avio_skip(ioc, length);
273 avio_read(ioc, buffer, length);
275 buffer[length] = '\0';
280 static int parse_keyframes_index(AVFormatContext *s, AVIOContext *ioc,
281 AVStream *vstream, int64_t max_pos)
283 FLVContext *flv = s->priv_data;
284 unsigned int arraylen = 0, timeslen = 0, fileposlen = 0, i;
287 int64_t *times = NULL;
288 int64_t *filepositions = NULL;
289 int ret = AVERROR(ENOSYS);
290 int64_t initial_pos = avio_tell(ioc);
292 if (s->flags & AVFMT_FLAG_IGNIDX)
295 while (avio_tell(ioc) < max_pos - 2 &&
296 amf_get_string(ioc, str_val, sizeof(str_val)) > 0) {
297 int64_t *current_array;
299 // Expect array object in context
300 if (avio_r8(ioc) != AMF_DATA_TYPE_ARRAY)
303 arraylen = avio_rb32(ioc);
307 /* Expect only 'times' or 'filepositions' sub-arrays in other
308 * case refuse to use such metadata for indexing. */
309 if (!strcmp(KEYFRAMES_TIMESTAMP_TAG, str_val) && !times) {
310 if (!(times = av_mallocz(sizeof(*times) * arraylen))) {
311 ret = AVERROR(ENOMEM);
315 current_array = times;
316 } else if (!strcmp(KEYFRAMES_BYTEOFFSET_TAG, str_val) &&
318 if (!(filepositions = av_mallocz(sizeof(*filepositions) * arraylen))) {
319 ret = AVERROR(ENOMEM);
322 fileposlen = arraylen;
323 current_array = filepositions;
325 // unexpected metatag inside keyframes, will not use such
326 // metadata for indexing
329 for (i = 0; i < arraylen && avio_tell(ioc) < max_pos - 1; i++) {
330 if (avio_r8(ioc) != AMF_DATA_TYPE_NUMBER)
332 num_val = av_int2double(avio_rb64(ioc));
333 current_array[i] = num_val;
335 if (times && filepositions) {
336 // All done, exiting at a position allowing amf_parse_object
337 // to finish parsing the object
343 if (!ret && timeslen == fileposlen) {
344 for (i = 0; i < fileposlen; i++) {
345 av_add_index_entry(vstream, filepositions[i], times[i] * 1000,
346 0, 0, AVINDEX_KEYFRAME);
348 flv->validate_index[i].pos = filepositions[i];
349 flv->validate_index[i].dts = times[i] * 1000;
350 flv->validate_count = i + 1;
354 av_log(s, AV_LOG_WARNING, "Invalid keyframes object, skipping.\n");
358 av_freep(&filepositions);
359 // If we got unexpected data, but successfully reset back to
360 // the start pos, the caller can continue parsing
361 if (ret < 0 && avio_seek(ioc, initial_pos, SEEK_SET) > 0)
366 static int amf_parse_object(AVFormatContext *s, AVStream *astream,
367 AVStream *vstream, const char *key,
368 int64_t max_pos, int depth)
370 AVCodecContext *acodec, *vcodec;
371 FLVContext *flv = s->priv_data;
373 AMFDataType amf_type;
379 amf_type = avio_r8(ioc);
382 case AMF_DATA_TYPE_NUMBER:
383 num_val = av_int2double(avio_rb64(ioc));
385 case AMF_DATA_TYPE_BOOL:
386 num_val = avio_r8(ioc);
388 case AMF_DATA_TYPE_STRING:
389 if (amf_get_string(ioc, str_val, sizeof(str_val)) < 0)
392 case AMF_DATA_TYPE_OBJECT:
393 if ((vstream || astream) && key &&
394 !strcmp(KEYFRAMES_TAG, key) && depth == 1)
395 if (parse_keyframes_index(s, ioc, vstream ? vstream : astream,
399 while (avio_tell(ioc) < max_pos - 2 &&
400 amf_get_string(ioc, str_val, sizeof(str_val)) > 0)
401 if (amf_parse_object(s, astream, vstream, str_val, max_pos,
403 return -1; // if we couldn't skip, bomb out.
404 if (avio_r8(ioc) != AMF_END_OF_OBJECT)
407 case AMF_DATA_TYPE_NULL:
408 case AMF_DATA_TYPE_UNDEFINED:
409 case AMF_DATA_TYPE_UNSUPPORTED:
410 break; // these take up no additional space
411 case AMF_DATA_TYPE_MIXEDARRAY:
412 avio_skip(ioc, 4); // skip 32-bit max array index
413 while (avio_tell(ioc) < max_pos - 2 &&
414 amf_get_string(ioc, str_val, sizeof(str_val)) > 0)
415 // this is the only case in which we would want a nested
416 // parse to not skip over the object
417 if (amf_parse_object(s, astream, vstream, str_val, max_pos,
420 if (avio_r8(ioc) != AMF_END_OF_OBJECT)
423 case AMF_DATA_TYPE_ARRAY:
425 unsigned int arraylen, i;
427 arraylen = avio_rb32(ioc);
428 for (i = 0; i < arraylen && avio_tell(ioc) < max_pos - 1; i++)
429 if (amf_parse_object(s, NULL, NULL, NULL, max_pos,
431 return -1; // if we couldn't skip, bomb out.
434 case AMF_DATA_TYPE_DATE:
435 avio_skip(ioc, 8 + 2); // timestamp (double) and UTC offset (int16)
437 default: // unsupported type, we couldn't skip
441 // only look for metadata values when we are not nested and key != NULL
442 if (depth == 1 && key) {
443 acodec = astream ? astream->codec : NULL;
444 vcodec = vstream ? vstream->codec : NULL;
446 if (amf_type == AMF_DATA_TYPE_NUMBER ||
447 amf_type == AMF_DATA_TYPE_BOOL) {
448 if (!strcmp(key, "duration"))
449 s->duration = num_val * AV_TIME_BASE;
450 else if (!strcmp(key, "videodatarate") && vcodec &&
451 0 <= (int)(num_val * 1024.0))
452 vcodec->bit_rate = num_val * 1024.0;
453 else if (!strcmp(key, "audiodatarate") && acodec &&
454 0 <= (int)(num_val * 1024.0))
455 acodec->bit_rate = num_val * 1024.0;
456 else if (!strcmp(key, "datastream")) {
457 AVStream *st = create_stream(s, AVMEDIA_TYPE_DATA);
459 return AVERROR(ENOMEM);
460 st->codec->codec_id = AV_CODEC_ID_TEXT;
461 } else if (flv->trust_metadata) {
462 if (!strcmp(key, "videocodecid") && vcodec) {
463 flv_set_video_codec(s, vstream, num_val, 0);
464 } else if (!strcmp(key, "audiocodecid") && acodec) {
465 int id = ((int)num_val) << FLV_AUDIO_CODECID_OFFSET;
466 flv_set_audio_codec(s, astream, acodec, id);
467 } else if (!strcmp(key, "audiosamplerate") && acodec) {
468 acodec->sample_rate = num_val;
469 } else if (!strcmp(key, "audiosamplesize") && acodec) {
470 acodec->bits_per_coded_sample = num_val;
471 } else if (!strcmp(key, "stereo") && acodec) {
472 acodec->channels = num_val + 1;
473 acodec->channel_layout = acodec->channels == 2 ?
474 AV_CH_LAYOUT_STEREO :
476 } else if (!strcmp(key, "width") && vcodec) {
477 vcodec->width = num_val;
478 } else if (!strcmp(key, "height") && vcodec) {
479 vcodec->height = num_val;
484 if (!strcmp(key, "duration") ||
485 !strcmp(key, "filesize") ||
486 !strcmp(key, "width") ||
487 !strcmp(key, "height") ||
488 !strcmp(key, "videodatarate") ||
489 !strcmp(key, "framerate") ||
490 !strcmp(key, "videocodecid") ||
491 !strcmp(key, "audiodatarate") ||
492 !strcmp(key, "audiosamplerate") ||
493 !strcmp(key, "audiosamplesize") ||
494 !strcmp(key, "stereo") ||
495 !strcmp(key, "audiocodecid"))
498 if (amf_type == AMF_DATA_TYPE_BOOL) {
499 av_strlcpy(str_val, num_val > 0 ? "true" : "false",
501 av_dict_set(&s->metadata, key, str_val, 0);
502 } else if (amf_type == AMF_DATA_TYPE_NUMBER) {
503 snprintf(str_val, sizeof(str_val), "%.f", num_val);
504 av_dict_set(&s->metadata, key, str_val, 0);
505 } else if (amf_type == AMF_DATA_TYPE_STRING)
506 av_dict_set(&s->metadata, key, str_val, 0);
512 static int flv_read_metabody(AVFormatContext *s, int64_t next_pos)
515 AVStream *stream, *astream, *vstream;
518 // only needs to hold the string "onMetaData".
519 // Anything longer is something we don't want.
526 // first object needs to be "onMetaData" string
528 if (type != AMF_DATA_TYPE_STRING ||
529 amf_get_string(ioc, buffer, sizeof(buffer)) < 0)
532 if (!strcmp(buffer, "onTextData"))
535 if (strcmp(buffer, "onMetaData"))
538 // find the streams now so that amf_parse_object doesn't need to do
539 // the lookup every time it is called.
540 for (i = 0; i < s->nb_streams; i++) {
541 stream = s->streams[i];
542 if (stream->codec->codec_type == AVMEDIA_TYPE_AUDIO)
544 else if (stream->codec->codec_type == AVMEDIA_TYPE_VIDEO)
548 // parse the second object (we want a mixed array)
549 if (amf_parse_object(s, astream, vstream, buffer, next_pos, 0) < 0)
555 static int flv_read_header(AVFormatContext *s)
560 flags = avio_r8(s->pb);
561 /* old flvtool cleared this field */
562 /* FIXME: better fix needed */
564 flags = FLV_HEADER_FLAG_HASVIDEO | FLV_HEADER_FLAG_HASAUDIO;
565 av_log(s, AV_LOG_WARNING,
566 "Broken FLV file, which says no streams present, "
567 "this might fail\n");
570 s->ctx_flags |= AVFMTCTX_NOHEADER;
572 if (flags & FLV_HEADER_FLAG_HASVIDEO)
573 if (!create_stream(s, AVMEDIA_TYPE_VIDEO))
574 return AVERROR(ENOMEM);
575 if (flags & FLV_HEADER_FLAG_HASAUDIO)
576 if (!create_stream(s, AVMEDIA_TYPE_AUDIO))
577 return AVERROR(ENOMEM);
579 offset = avio_rb32(s->pb);
580 avio_seek(s->pb, offset, SEEK_SET);
588 static int flv_read_close(AVFormatContext *s)
590 FLVContext *flv = s->priv_data;
591 av_freep(&flv->new_extradata[0]);
592 av_freep(&flv->new_extradata[1]);
596 static int flv_get_extradata(AVFormatContext *s, AVStream *st, int size)
598 av_free(st->codec->extradata);
599 st->codec->extradata = av_mallocz(size + FF_INPUT_BUFFER_PADDING_SIZE);
600 if (!st->codec->extradata)
601 return AVERROR(ENOMEM);
602 st->codec->extradata_size = size;
603 avio_read(s->pb, st->codec->extradata, st->codec->extradata_size);
607 static int flv_queue_extradata(FLVContext *flv, AVIOContext *pb, int stream,
610 av_free(flv->new_extradata[stream]);
611 flv->new_extradata[stream] = av_mallocz(size +
612 FF_INPUT_BUFFER_PADDING_SIZE);
613 if (!flv->new_extradata[stream])
614 return AVERROR(ENOMEM);
615 flv->new_extradata_size[stream] = size;
616 avio_read(pb, flv->new_extradata[stream], size);
620 static void clear_index_entries(AVFormatContext *s, int64_t pos)
623 av_log(s, AV_LOG_WARNING,
624 "Found invalid index entries, clearing the index.\n");
625 for (i = 0; i < s->nb_streams; i++) {
626 AVStream *st = s->streams[i];
627 /* Remove all index entries that point to >= pos */
629 for (j = 0; j < st->nb_index_entries; j++)
630 if (st->index_entries[j].pos < pos)
631 st->index_entries[out++] = st->index_entries[j];
632 st->nb_index_entries = out;
636 static int flv_data_packet(AVFormatContext *s, AVPacket *pkt,
637 int64_t dts, int64_t next)
639 AVIOContext *pb = s->pb;
646 if (type == AMF_DATA_TYPE_MIXEDARRAY)
647 avio_seek(pb, 4, SEEK_CUR);
648 else if (type != AMF_DATA_TYPE_OBJECT)
649 return AVERROR_INVALIDDATA;
651 amf_get_string(pb, buf, sizeof(buf));
652 if (strcmp(buf, "type") || avio_r8(pb) != AMF_DATA_TYPE_STRING)
653 return AVERROR_INVALIDDATA;
655 amf_get_string(pb, buf, sizeof(buf));
656 // FIXME parse it as codec_id
657 amf_get_string(pb, buf, sizeof(buf));
658 if (strcmp(buf, "text") || avio_r8(pb) != AMF_DATA_TYPE_STRING)
659 return AVERROR_INVALIDDATA;
661 length = avio_rb16(pb);
662 ret = av_get_packet(s->pb, pkt, length);
666 for (i = 0; i < s->nb_streams; i++) {
668 if (st->codec->codec_type == AVMEDIA_TYPE_DATA)
672 if (i == s->nb_streams) {
673 st = create_stream(s, AVMEDIA_TYPE_DATA);
675 return AVERROR_INVALIDDATA;
676 st->codec->codec_id = AV_CODEC_ID_TEXT;
683 pkt->stream_index = st->index;
684 pkt->flags |= AV_PKT_FLAG_KEY;
686 avio_seek(s->pb, next + 4, SEEK_SET);
691 static int flv_read_packet(AVFormatContext *s, AVPacket *pkt)
693 FLVContext *flv = s->priv_data;
694 int ret, i, type, size, flags, is_audio;
696 int64_t dts, pts = AV_NOPTS_VALUE;
697 int sample_rate = 0, channels = 0;
700 /* pkt size is repeated at end. skip it */
701 for (;; avio_skip(s->pb, 4)) {
702 pos = avio_tell(s->pb);
703 type = avio_r8(s->pb);
704 size = avio_rb24(s->pb);
705 dts = avio_rb24(s->pb);
706 dts |= avio_r8(s->pb) << 24;
707 av_dlog(s, "type:%d, size:%d, dts:%"PRId64"\n", type, size, dts);
708 if (s->pb->eof_reached)
710 avio_skip(s->pb, 3); /* stream id, always 0 */
713 if (flv->validate_next < flv->validate_count) {
714 int64_t validate_pos = flv->validate_index[flv->validate_next].pos;
715 if (pos == validate_pos) {
716 if (FFABS(dts - flv->validate_index[flv->validate_next].dts) <=
717 VALIDATE_INDEX_TS_THRESH) {
718 flv->validate_next++;
720 clear_index_entries(s, validate_pos);
721 flv->validate_count = 0;
723 } else if (pos > validate_pos) {
724 clear_index_entries(s, validate_pos);
725 flv->validate_count = 0;
732 next = size + avio_tell(s->pb);
734 if (type == FLV_TAG_TYPE_AUDIO) {
736 flags = avio_r8(s->pb);
738 } else if (type == FLV_TAG_TYPE_VIDEO) {
740 flags = avio_r8(s->pb);
742 if ((flags & 0xf0) == 0x50) /* video info / command frame */
745 if (type == FLV_TAG_TYPE_META && size > 13 + 1 + 4)
746 if (flv_read_metabody(s, next) > 0) {
747 return flv_data_packet(s, pkt, dts, next);
748 } else /* skip packet */
749 av_log(s, AV_LOG_DEBUG,
750 "skipping flv packet: type %d, size %d, flags %d\n",
754 avio_seek(s->pb, next, SEEK_SET);
758 /* skip empty data packets */
762 /* now find stream */
763 for (i = 0; i < s->nb_streams; i++) {
765 if (is_audio && st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
766 if (flv_same_audio_codec(st->codec, flags))
768 } else if (!is_audio &&
769 st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
770 if (flv_same_video_codec(st->codec, flags))
774 if (i == s->nb_streams)
775 st = create_stream(s, is_audio ? AVMEDIA_TYPE_AUDIO
776 : AVMEDIA_TYPE_VIDEO);
777 av_dlog(s, "%d %X %d \n", is_audio, flags, st->discard);
778 if ((st->discard >= AVDISCARD_NONKEY &&
779 !((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY || is_audio)) ||
780 (st->discard >= AVDISCARD_BIDIR &&
781 ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_DISP_INTER && !is_audio)) ||
782 st->discard >= AVDISCARD_ALL) {
783 avio_seek(s->pb, next, SEEK_SET);
786 if ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY)
787 av_add_index_entry(st, pos, dts, size, 0, AVINDEX_KEYFRAME);
791 // if not streamed and no duration from metadata then seek to end to find
792 // the duration from the timestamps
793 if (s->pb->seekable && (!s->duration || s->duration == AV_NOPTS_VALUE)) {
795 const int64_t pos = avio_tell(s->pb);
796 const int64_t fsize = avio_size(s->pb);
797 avio_seek(s->pb, fsize - 4, SEEK_SET);
798 size = avio_rb32(s->pb);
799 avio_seek(s->pb, fsize - 3 - size, SEEK_SET);
800 if (size == avio_rb24(s->pb) + 11) {
801 uint32_t ts = avio_rb24(s->pb);
802 ts |= avio_r8(s->pb) << 24;
803 s->duration = ts * (int64_t)AV_TIME_BASE / 1000;
805 avio_seek(s->pb, pos, SEEK_SET);
809 int bits_per_coded_sample;
810 channels = (flags & FLV_AUDIO_CHANNEL_MASK) == FLV_STEREO ? 2 : 1;
811 sample_rate = 44100 << ((flags & FLV_AUDIO_SAMPLERATE_MASK) >>
812 FLV_AUDIO_SAMPLERATE_OFFSET) >> 3;
813 bits_per_coded_sample = (flags & FLV_AUDIO_SAMPLESIZE_MASK) ? 16 : 8;
814 if (!st->codec->channels || !st->codec->sample_rate ||
815 !st->codec->bits_per_coded_sample) {
816 st->codec->channels = channels;
817 st->codec->channel_layout = channels == 1
819 : AV_CH_LAYOUT_STEREO;
820 st->codec->sample_rate = sample_rate;
821 st->codec->bits_per_coded_sample = bits_per_coded_sample;
823 if (!st->codec->codec_id) {
824 flv_set_audio_codec(s, st, st->codec,
825 flags & FLV_AUDIO_CODECID_MASK);
826 flv->last_sample_rate =
827 sample_rate = st->codec->sample_rate;
829 channels = st->codec->channels;
832 ctx.sample_rate = sample_rate;
833 flv_set_audio_codec(s, st, &ctx, flags & FLV_AUDIO_CODECID_MASK);
834 sample_rate = ctx.sample_rate;
837 size -= flv_set_video_codec(s, st, flags & FLV_VIDEO_CODECID_MASK, 1);
840 if (st->codec->codec_id == AV_CODEC_ID_AAC ||
841 st->codec->codec_id == AV_CODEC_ID_H264) {
842 int type = avio_r8(s->pb);
844 if (st->codec->codec_id == AV_CODEC_ID_H264) {
846 int32_t cts = (avio_rb24(s->pb) + 0xff800000) ^ 0xff800000;
848 if (cts < 0) { // dts are wrong
850 av_log(s, AV_LOG_WARNING,
851 "negative cts, previous timestamps might be wrong\n");
854 dts = AV_NOPTS_VALUE;
857 if (st->codec->extradata) {
858 if ((ret = flv_queue_extradata(flv, s->pb, is_audio, size)) < 0)
860 ret = AVERROR(EAGAIN);
863 if ((ret = flv_get_extradata(s, st, size)) < 0)
865 if (st->codec->codec_id == AV_CODEC_ID_AAC) {
866 MPEG4AudioConfig cfg;
867 avpriv_mpeg4audio_get_config(&cfg, st->codec->extradata,
868 st->codec->extradata_size * 8, 1);
869 st->codec->channels = cfg.channels;
870 st->codec->channel_layout = 0;
871 if (cfg.ext_sample_rate)
872 st->codec->sample_rate = cfg.ext_sample_rate;
874 st->codec->sample_rate = cfg.sample_rate;
875 av_dlog(s, "mp4a config channels %d sample rate %d\n",
876 st->codec->channels, st->codec->sample_rate);
879 ret = AVERROR(EAGAIN);
884 /* skip empty data packets */
886 ret = AVERROR(EAGAIN);
890 ret = av_get_packet(s->pb, pkt, size);
893 /* note: we need to modify the packet size here to handle the last
897 pkt->pts = pts == AV_NOPTS_VALUE ? dts : pts;
898 pkt->stream_index = st->index;
899 if (flv->new_extradata[is_audio]) {
900 uint8_t *side = av_packet_new_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA,
901 flv->new_extradata_size[is_audio]);
903 memcpy(side, flv->new_extradata[is_audio],
904 flv->new_extradata_size[is_audio]);
905 av_freep(&flv->new_extradata[is_audio]);
906 flv->new_extradata_size[is_audio] = 0;
909 if (is_audio && (sample_rate != flv->last_sample_rate ||
910 channels != flv->last_channels)) {
911 flv->last_sample_rate = sample_rate;
912 flv->last_channels = channels;
913 ff_add_param_change(pkt, channels, 0, sample_rate, 0, 0);
916 if (is_audio || ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY))
917 pkt->flags |= AV_PKT_FLAG_KEY;
924 static int flv_read_seek(AVFormatContext *s, int stream_index,
925 int64_t ts, int flags)
927 FLVContext *flv = s->priv_data;
928 flv->validate_count = 0;
929 return avio_seek_time(s->pb, stream_index, ts, flags);
932 #define OFFSET(x) offsetof(FLVContext, x)
933 #define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM
934 static const AVOption options[] = {
935 { "flv_metadata", "Allocate streams according the onMetaData array", OFFSET(trust_metadata), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VD },
939 static const AVClass class = {
940 .class_name = "flvdec",
941 .item_name = av_default_item_name,
943 .version = LIBAVUTIL_VERSION_INT,
946 AVInputFormat ff_flv_demuxer = {
948 .long_name = NULL_IF_CONFIG_SMALL("FLV (Flash Video)"),
949 .priv_data_size = sizeof(FLVContext),
950 .read_probe = flv_probe,
951 .read_header = flv_read_header,
952 .read_packet = flv_read_packet,
953 .read_seek = flv_read_seek,
954 .read_close = flv_read_close,
956 .priv_class = &class,