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") ||
496 !strcmp(key, "datastream"))
499 if (amf_type == AMF_DATA_TYPE_BOOL) {
500 av_strlcpy(str_val, num_val > 0 ? "true" : "false",
502 av_dict_set(&s->metadata, key, str_val, 0);
503 } else if (amf_type == AMF_DATA_TYPE_NUMBER) {
504 snprintf(str_val, sizeof(str_val), "%.f", num_val);
505 av_dict_set(&s->metadata, key, str_val, 0);
506 } else if (amf_type == AMF_DATA_TYPE_STRING)
507 av_dict_set(&s->metadata, key, str_val, 0);
513 static int flv_read_metabody(AVFormatContext *s, int64_t next_pos)
516 AVStream *stream, *astream, *vstream;
519 // only needs to hold the string "onMetaData".
520 // Anything longer is something we don't want.
527 // first object needs to be "onMetaData" string
529 if (type != AMF_DATA_TYPE_STRING ||
530 amf_get_string(ioc, buffer, sizeof(buffer)) < 0)
533 if (!strcmp(buffer, "onTextData"))
536 if (strcmp(buffer, "onMetaData"))
539 // find the streams now so that amf_parse_object doesn't need to do
540 // the lookup every time it is called.
541 for (i = 0; i < s->nb_streams; i++) {
542 stream = s->streams[i];
543 if (stream->codec->codec_type == AVMEDIA_TYPE_AUDIO)
545 else if (stream->codec->codec_type == AVMEDIA_TYPE_VIDEO)
549 // parse the second object (we want a mixed array)
550 if (amf_parse_object(s, astream, vstream, buffer, next_pos, 0) < 0)
556 static int flv_read_header(AVFormatContext *s)
561 flags = avio_r8(s->pb);
562 /* old flvtool cleared this field */
563 /* FIXME: better fix needed */
565 flags = FLV_HEADER_FLAG_HASVIDEO | FLV_HEADER_FLAG_HASAUDIO;
566 av_log(s, AV_LOG_WARNING,
567 "Broken FLV file, which says no streams present, "
568 "this might fail.\n");
571 s->ctx_flags |= AVFMTCTX_NOHEADER;
573 if (flags & FLV_HEADER_FLAG_HASVIDEO)
574 if (!create_stream(s, AVMEDIA_TYPE_VIDEO))
575 return AVERROR(ENOMEM);
576 if (flags & FLV_HEADER_FLAG_HASAUDIO)
577 if (!create_stream(s, AVMEDIA_TYPE_AUDIO))
578 return AVERROR(ENOMEM);
580 offset = avio_rb32(s->pb);
581 avio_seek(s->pb, offset, SEEK_SET);
589 static int flv_read_close(AVFormatContext *s)
591 FLVContext *flv = s->priv_data;
592 av_freep(&flv->new_extradata[0]);
593 av_freep(&flv->new_extradata[1]);
597 static int flv_get_extradata(AVFormatContext *s, AVStream *st, int size)
599 av_free(st->codec->extradata);
600 st->codec->extradata = av_mallocz(size + FF_INPUT_BUFFER_PADDING_SIZE);
601 if (!st->codec->extradata)
602 return AVERROR(ENOMEM);
603 st->codec->extradata_size = size;
604 avio_read(s->pb, st->codec->extradata, st->codec->extradata_size);
608 static int flv_queue_extradata(FLVContext *flv, AVIOContext *pb, int stream,
611 av_free(flv->new_extradata[stream]);
612 flv->new_extradata[stream] = av_mallocz(size +
613 FF_INPUT_BUFFER_PADDING_SIZE);
614 if (!flv->new_extradata[stream])
615 return AVERROR(ENOMEM);
616 flv->new_extradata_size[stream] = size;
617 avio_read(pb, flv->new_extradata[stream], size);
621 static void clear_index_entries(AVFormatContext *s, int64_t pos)
624 av_log(s, AV_LOG_WARNING,
625 "Found invalid index entries, clearing the index.\n");
626 for (i = 0; i < s->nb_streams; i++) {
627 AVStream *st = s->streams[i];
628 /* Remove all index entries that point to >= pos */
630 for (j = 0; j < st->nb_index_entries; j++)
631 if (st->index_entries[j].pos < pos)
632 st->index_entries[out++] = st->index_entries[j];
633 st->nb_index_entries = out;
637 static int amf_skip_tag(AVIOContext *pb, AMFDataType type)
639 int nb = -1, ret, parse_name = 1;
642 case AMF_DATA_TYPE_NUMBER:
645 case AMF_DATA_TYPE_BOOL:
648 case AMF_DATA_TYPE_STRING:
649 avio_skip(pb, avio_rb16(pb));
651 case AMF_DATA_TYPE_ARRAY:
653 case AMF_DATA_TYPE_MIXEDARRAY:
655 case AMF_DATA_TYPE_OBJECT:
656 while(!pb->eof_reached && (nb-- > 0 || type != AMF_DATA_TYPE_ARRAY)) {
658 int size = avio_rb16(pb);
665 if ((ret = amf_skip_tag(pb, avio_r8(pb))) < 0)
669 case AMF_DATA_TYPE_NULL:
670 case AMF_DATA_TYPE_OBJECT_END:
673 return AVERROR_INVALIDDATA;
678 static int flv_data_packet(AVFormatContext *s, AVPacket *pkt,
679 int64_t dts, int64_t next)
681 AVIOContext *pb = s->pb;
684 int ret = AVERROR_INVALIDDATA;
687 switch (avio_r8(pb)) {
688 case AMF_DATA_TYPE_MIXEDARRAY:
689 avio_seek(pb, 4, SEEK_CUR);
690 case AMF_DATA_TYPE_OBJECT:
696 while ((ret = amf_get_string(pb, buf, sizeof(buf))) > 0) {
697 AMFDataType type = avio_r8(pb);
698 if (type == AMF_DATA_TYPE_STRING && !strcmp(buf, "text")) {
699 length = avio_rb16(pb);
700 ret = av_get_packet(pb, pkt, length);
706 if ((ret = amf_skip_tag(pb, type)) < 0)
712 ret = AVERROR_INVALIDDATA;
716 for (i = 0; i < s->nb_streams; i++) {
718 if (st->codec->codec_type == AVMEDIA_TYPE_DATA)
722 if (i == s->nb_streams) {
723 st = create_stream(s, AVMEDIA_TYPE_DATA);
725 return AVERROR_INVALIDDATA;
726 st->codec->codec_id = AV_CODEC_ID_TEXT;
733 pkt->stream_index = st->index;
734 pkt->flags |= AV_PKT_FLAG_KEY;
737 avio_seek(s->pb, next + 4, SEEK_SET);
742 static int flv_read_packet(AVFormatContext *s, AVPacket *pkt)
744 FLVContext *flv = s->priv_data;
745 int ret, i, type, size, flags, is_audio;
747 int64_t dts, pts = AV_NOPTS_VALUE;
748 int sample_rate = 0, channels = 0;
751 /* pkt size is repeated at end. skip it */
752 for (;; avio_skip(s->pb, 4)) {
753 pos = avio_tell(s->pb);
754 type = avio_r8(s->pb);
755 size = avio_rb24(s->pb);
756 dts = avio_rb24(s->pb);
757 dts |= avio_r8(s->pb) << 24;
758 av_dlog(s, "type:%d, size:%d, dts:%"PRId64"\n", type, size, dts);
759 if (s->pb->eof_reached)
761 avio_skip(s->pb, 3); /* stream id, always 0 */
764 if (flv->validate_next < flv->validate_count) {
765 int64_t validate_pos = flv->validate_index[flv->validate_next].pos;
766 if (pos == validate_pos) {
767 if (FFABS(dts - flv->validate_index[flv->validate_next].dts) <=
768 VALIDATE_INDEX_TS_THRESH) {
769 flv->validate_next++;
771 clear_index_entries(s, validate_pos);
772 flv->validate_count = 0;
774 } else if (pos > validate_pos) {
775 clear_index_entries(s, validate_pos);
776 flv->validate_count = 0;
783 next = size + avio_tell(s->pb);
785 if (type == FLV_TAG_TYPE_AUDIO) {
787 flags = avio_r8(s->pb);
789 } else if (type == FLV_TAG_TYPE_VIDEO) {
791 flags = avio_r8(s->pb);
793 if ((flags & 0xf0) == 0x50) /* video info / command frame */
796 if (type == FLV_TAG_TYPE_META && size > 13 + 1 + 4)
797 if (flv_read_metabody(s, next) > 0) {
798 return flv_data_packet(s, pkt, dts, next);
799 } else /* skip packet */
800 av_log(s, AV_LOG_DEBUG,
801 "Skipping flv packet: type %d, size %d, flags %d.\n",
805 avio_seek(s->pb, next, SEEK_SET);
809 /* skip empty data packets */
813 /* now find stream */
814 for (i = 0; i < s->nb_streams; i++) {
816 if (is_audio && st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
817 if (flv_same_audio_codec(st->codec, flags))
819 } else if (!is_audio &&
820 st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
821 if (flv_same_video_codec(st->codec, flags))
825 if (i == s->nb_streams)
826 st = create_stream(s, is_audio ? AVMEDIA_TYPE_AUDIO
827 : AVMEDIA_TYPE_VIDEO);
828 av_dlog(s, "%d %X %d \n", is_audio, flags, st->discard);
829 if ((st->discard >= AVDISCARD_NONKEY &&
830 !((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY || is_audio)) ||
831 (st->discard >= AVDISCARD_BIDIR &&
832 ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_DISP_INTER && !is_audio)) ||
833 st->discard >= AVDISCARD_ALL) {
834 avio_seek(s->pb, next, SEEK_SET);
837 if ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY)
838 av_add_index_entry(st, pos, dts, size, 0, AVINDEX_KEYFRAME);
842 // if not streamed and no duration from metadata then seek to end to find
843 // the duration from the timestamps
844 if (s->pb->seekable && (!s->duration || s->duration == AV_NOPTS_VALUE)) {
846 const int64_t pos = avio_tell(s->pb);
847 const int64_t fsize = avio_size(s->pb);
848 avio_seek(s->pb, fsize - 4, SEEK_SET);
849 size = avio_rb32(s->pb);
850 avio_seek(s->pb, fsize - 3 - size, SEEK_SET);
851 if (size == avio_rb24(s->pb) + 11) {
852 uint32_t ts = avio_rb24(s->pb);
853 ts |= avio_r8(s->pb) << 24;
854 s->duration = ts * (int64_t)AV_TIME_BASE / 1000;
856 avio_seek(s->pb, pos, SEEK_SET);
860 int bits_per_coded_sample;
861 channels = (flags & FLV_AUDIO_CHANNEL_MASK) == FLV_STEREO ? 2 : 1;
862 sample_rate = 44100 << ((flags & FLV_AUDIO_SAMPLERATE_MASK) >>
863 FLV_AUDIO_SAMPLERATE_OFFSET) >> 3;
864 bits_per_coded_sample = (flags & FLV_AUDIO_SAMPLESIZE_MASK) ? 16 : 8;
865 if (!st->codec->channels || !st->codec->sample_rate ||
866 !st->codec->bits_per_coded_sample) {
867 st->codec->channels = channels;
868 st->codec->channel_layout = channels == 1
870 : AV_CH_LAYOUT_STEREO;
871 st->codec->sample_rate = sample_rate;
872 st->codec->bits_per_coded_sample = bits_per_coded_sample;
874 if (!st->codec->codec_id) {
875 flv_set_audio_codec(s, st, st->codec,
876 flags & FLV_AUDIO_CODECID_MASK);
877 flv->last_sample_rate =
878 sample_rate = st->codec->sample_rate;
880 channels = st->codec->channels;
883 ctx.sample_rate = sample_rate;
884 flv_set_audio_codec(s, st, &ctx, flags & FLV_AUDIO_CODECID_MASK);
885 sample_rate = ctx.sample_rate;
888 size -= flv_set_video_codec(s, st, flags & FLV_VIDEO_CODECID_MASK, 1);
891 if (st->codec->codec_id == AV_CODEC_ID_AAC ||
892 st->codec->codec_id == AV_CODEC_ID_H264) {
893 int type = avio_r8(s->pb);
895 if (st->codec->codec_id == AV_CODEC_ID_H264) {
897 int32_t cts = (avio_rb24(s->pb) + 0xff800000) ^ 0xff800000;
899 if (cts < 0 && !flv->wrong_dts) { // dts might be wrong
901 av_log(s, AV_LOG_WARNING,
902 "Negative cts, previous timestamps might be wrong.\n");
905 dts = AV_NOPTS_VALUE;
908 if (st->codec->extradata) {
909 if ((ret = flv_queue_extradata(flv, s->pb, is_audio, size)) < 0)
911 ret = AVERROR(EAGAIN);
914 if ((ret = flv_get_extradata(s, st, size)) < 0)
916 if (st->codec->codec_id == AV_CODEC_ID_AAC) {
917 MPEG4AudioConfig cfg;
919 /* Workaround for buggy Omnia A/XE encoder */
920 AVDictionaryEntry *t = av_dict_get(s->metadata, "Encoder", NULL, 0);
921 if (t && !strcmp(t->value, "Omnia A/XE"))
922 st->codec->extradata_size = 2;
924 avpriv_mpeg4audio_get_config(&cfg, st->codec->extradata,
925 st->codec->extradata_size * 8, 1);
926 st->codec->channels = cfg.channels;
927 st->codec->channel_layout = 0;
928 if (cfg.ext_sample_rate)
929 st->codec->sample_rate = cfg.ext_sample_rate;
931 st->codec->sample_rate = cfg.sample_rate;
932 av_dlog(s, "mp4a config channels %d sample rate %d\n",
933 st->codec->channels, st->codec->sample_rate);
936 ret = AVERROR(EAGAIN);
941 /* skip empty data packets */
943 ret = AVERROR(EAGAIN);
947 ret = av_get_packet(s->pb, pkt, size);
950 /* note: we need to modify the packet size here to handle the last
954 pkt->pts = pts == AV_NOPTS_VALUE ? dts : pts;
955 pkt->stream_index = st->index;
956 if (flv->new_extradata[is_audio]) {
957 uint8_t *side = av_packet_new_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA,
958 flv->new_extradata_size[is_audio]);
960 memcpy(side, flv->new_extradata[is_audio],
961 flv->new_extradata_size[is_audio]);
962 av_freep(&flv->new_extradata[is_audio]);
963 flv->new_extradata_size[is_audio] = 0;
966 if (is_audio && (sample_rate != flv->last_sample_rate ||
967 channels != flv->last_channels)) {
968 flv->last_sample_rate = sample_rate;
969 flv->last_channels = channels;
970 ff_add_param_change(pkt, channels, 0, sample_rate, 0, 0);
973 if (is_audio || ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY))
974 pkt->flags |= AV_PKT_FLAG_KEY;
981 static int flv_read_seek(AVFormatContext *s, int stream_index,
982 int64_t ts, int flags)
984 FLVContext *flv = s->priv_data;
985 flv->validate_count = 0;
986 return avio_seek_time(s->pb, stream_index, ts, flags);
989 #define OFFSET(x) offsetof(FLVContext, x)
990 #define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM
991 static const AVOption options[] = {
992 { "flv_metadata", "Allocate streams according to the onMetaData array", OFFSET(trust_metadata), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VD },
996 static const AVClass class = {
997 .class_name = "flvdec",
998 .item_name = av_default_item_name,
1000 .version = LIBAVUTIL_VERSION_INT,
1003 AVInputFormat ff_flv_demuxer = {
1005 .long_name = NULL_IF_CONFIG_SMALL("FLV (Flash Video)"),
1006 .priv_data_size = sizeof(FLVContext),
1007 .read_probe = flv_probe,
1008 .read_header = flv_read_header,
1009 .read_packet = flv_read_packet,
1010 .read_seek = flv_read_seek,
1011 .read_close = flv_read_close,
1012 .extensions = "flv",
1013 .priv_class = &class,