3 * Copyright (c) 2003 The FFmpeg 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 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 "libavcodec/bytestream.h"
29 #include "libavcodec/mpeg4audio.h"
31 #include "avio_internal.h"
35 int wrong_dts; ///< wrong dts due to negative cts
38 static int flv_probe(AVProbeData *p)
43 if (d[0] == 'F' && d[1] == 'L' && d[2] == 'V' && d[3] < 5 && d[5]==0 && AV_RB32(d+5)>8) {
44 return AVPROBE_SCORE_MAX;
49 static void flv_set_audio_codec(AVFormatContext *s, AVStream *astream, int flv_codecid) {
50 AVCodecContext *acodec = astream->codec;
52 //no distinction between S16 and S8 PCM codec flags
54 acodec->codec_id = acodec->bits_per_coded_sample == 8 ? CODEC_ID_PCM_U8 :
61 case FLV_CODECID_PCM_LE:
62 acodec->codec_id = acodec->bits_per_coded_sample == 8 ? CODEC_ID_PCM_U8 : CODEC_ID_PCM_S16LE; break;
63 case FLV_CODECID_AAC : acodec->codec_id = CODEC_ID_AAC; break;
64 case FLV_CODECID_ADPCM: acodec->codec_id = CODEC_ID_ADPCM_SWF; break;
65 case FLV_CODECID_SPEEX:
66 acodec->codec_id = CODEC_ID_SPEEX;
67 acodec->sample_rate = 16000;
69 case FLV_CODECID_MP3 : acodec->codec_id = CODEC_ID_MP3 ; astream->need_parsing = AVSTREAM_PARSE_FULL; break;
70 case FLV_CODECID_NELLYMOSER_8KHZ_MONO:
71 acodec->sample_rate = 8000; //in case metadata does not otherwise declare samplerate
72 acodec->codec_id = CODEC_ID_NELLYMOSER;
74 case FLV_CODECID_NELLYMOSER_16KHZ_MONO:
75 acodec->sample_rate = 16000;
76 acodec->codec_id = CODEC_ID_NELLYMOSER;
78 case FLV_CODECID_NELLYMOSER:
79 acodec->codec_id = CODEC_ID_NELLYMOSER;
82 av_log(s, AV_LOG_INFO, "Unsupported audio codec (%x)\n", flv_codecid >> FLV_AUDIO_CODECID_OFFSET);
83 acodec->codec_tag = flv_codecid >> FLV_AUDIO_CODECID_OFFSET;
87 static int flv_set_video_codec(AVFormatContext *s, AVStream *vstream, int flv_codecid) {
88 AVCodecContext *vcodec = vstream->codec;
90 case FLV_CODECID_H263 : vcodec->codec_id = CODEC_ID_FLV1 ; break;
91 case FLV_CODECID_SCREEN: vcodec->codec_id = CODEC_ID_FLASHSV; break;
92 case FLV_CODECID_SCREEN2: vcodec->codec_id = CODEC_ID_FLASHSV2; break;
93 case FLV_CODECID_VP6 : vcodec->codec_id = CODEC_ID_VP6F ;
94 case FLV_CODECID_VP6A :
95 if(flv_codecid == FLV_CODECID_VP6A)
96 vcodec->codec_id = CODEC_ID_VP6A;
97 if(vcodec->extradata_size != 1) {
98 vcodec->extradata_size = 1;
99 vcodec->extradata = av_malloc(1);
101 vcodec->extradata[0] = avio_r8(s->pb);
102 return 1; // 1 byte body size adjustment for flv_read_packet()
103 case FLV_CODECID_H264:
104 vcodec->codec_id = CODEC_ID_H264;
105 return 3; // not 4, reading packet type will consume one byte
107 av_log(s, AV_LOG_INFO, "Unsupported video codec (%x)\n", flv_codecid);
108 vcodec->codec_tag = flv_codecid;
114 static int amf_get_string(AVIOContext *ioc, char *buffer, int buffsize) {
115 int length = avio_rb16(ioc);
116 if(length >= buffsize) {
117 avio_skip(ioc, length);
121 avio_read(ioc, buffer, length);
123 buffer[length] = '\0';
128 static int parse_keyframes_index(AVFormatContext *s, AVIOContext *ioc, AVStream *vstream, int64_t max_pos) {
129 unsigned int timeslen = 0, fileposlen = 0, i;
131 int64_t *times = NULL;
132 int64_t *filepositions = NULL;
133 int ret = AVERROR(ENOSYS);
134 int64_t initial_pos = avio_tell(ioc);
136 while (avio_tell(ioc) < max_pos - 2 && amf_get_string(ioc, str_val, sizeof(str_val)) > 0) {
137 int64_t** current_array;
138 unsigned int arraylen;
140 // Expect array object in context
141 if (avio_r8(ioc) != AMF_DATA_TYPE_ARRAY)
144 arraylen = avio_rb32(ioc);
148 if (!strcmp(KEYFRAMES_TIMESTAMP_TAG , str_val) && !times){
149 current_array= ×
151 }else if (!strcmp(KEYFRAMES_BYTEOFFSET_TAG, str_val) && !filepositions){
152 current_array= &filepositions;
153 fileposlen= arraylen;
154 }else // unexpected metatag inside keyframes, will not use such metadata for indexing
157 if (!(*current_array = av_mallocz(sizeof(**current_array) * arraylen))) {
158 ret = AVERROR(ENOMEM);
162 for (i = 0; i < arraylen && avio_tell(ioc) < max_pos - 1; i++) {
163 if (avio_r8(ioc) != AMF_DATA_TYPE_NUMBER)
165 current_array[0][i] = av_int2dbl(avio_rb64(ioc));
167 if (times && filepositions) {
168 // All done, exiting at a position allowing amf_parse_object
169 // to finish parsing the object
175 if (timeslen == fileposlen) {
176 for(i = 0; i < timeslen; i++)
177 av_add_index_entry(vstream, filepositions[i], times[i]*1000, 0, 0, AVINDEX_KEYFRAME);
179 av_log(s, AV_LOG_WARNING, "Invalid keyframes object, skipping.\n");
183 av_freep(&filepositions);
184 avio_seek(ioc, initial_pos, SEEK_SET);
188 static int amf_parse_object(AVFormatContext *s, AVStream *astream, AVStream *vstream, const char *key, int64_t max_pos, int depth) {
189 AVCodecContext *acodec, *vcodec;
191 AMFDataType amf_type;
198 amf_type = avio_r8(ioc);
201 case AMF_DATA_TYPE_NUMBER:
202 num_val = av_int2dbl(avio_rb64(ioc)); break;
203 case AMF_DATA_TYPE_BOOL:
204 num_val = avio_r8(ioc); break;
205 case AMF_DATA_TYPE_STRING:
206 if(amf_get_string(ioc, str_val, sizeof(str_val)) < 0)
209 case AMF_DATA_TYPE_OBJECT: {
212 if (ioc->seekable && key && !strcmp(KEYFRAMES_TAG, key) && depth == 1)
213 if (parse_keyframes_index(s, ioc, vstream, max_pos) < 0)
214 av_log(s, AV_LOG_ERROR, "Keyframe index parsing failed\n");
216 while(avio_tell(ioc) < max_pos - 2 && (keylen = avio_rb16(ioc))) {
217 avio_skip(ioc, keylen); //skip key string
218 if(amf_parse_object(s, NULL, NULL, NULL, max_pos, depth + 1) < 0)
219 return -1; //if we couldn't skip, bomb out.
221 if(avio_r8(ioc) != AMF_END_OF_OBJECT)
225 case AMF_DATA_TYPE_NULL:
226 case AMF_DATA_TYPE_UNDEFINED:
227 case AMF_DATA_TYPE_UNSUPPORTED:
228 break; //these take up no additional space
229 case AMF_DATA_TYPE_MIXEDARRAY:
230 avio_skip(ioc, 4); //skip 32-bit max array index
231 while(avio_tell(ioc) < max_pos - 2 && amf_get_string(ioc, str_val, sizeof(str_val)) > 0) {
232 //this is the only case in which we would want a nested parse to not skip over the object
233 if(amf_parse_object(s, astream, vstream, str_val, max_pos, depth + 1) < 0)
236 if(avio_r8(ioc) != AMF_END_OF_OBJECT)
239 case AMF_DATA_TYPE_ARRAY: {
240 unsigned int arraylen, i;
242 arraylen = avio_rb32(ioc);
243 for(i = 0; i < arraylen && avio_tell(ioc) < max_pos - 1; i++) {
244 if(amf_parse_object(s, NULL, NULL, NULL, max_pos, depth + 1) < 0)
245 return -1; //if we couldn't skip, bomb out.
249 case AMF_DATA_TYPE_DATE:
250 avio_skip(ioc, 8 + 2); //timestamp (double) and UTC offset (int16)
252 default: //unsupported type, we couldn't skip
256 if(depth == 1 && key) { //only look for metadata values when we are not nested and key != NULL
257 acodec = astream ? astream->codec : NULL;
258 vcodec = vstream ? vstream->codec : NULL;
260 if(amf_type == AMF_DATA_TYPE_BOOL) {
261 av_strlcpy(str_val, num_val > 0 ? "true" : "false", sizeof(str_val));
262 av_metadata_set2(&s->metadata, key, str_val, 0);
263 } else if(amf_type == AMF_DATA_TYPE_NUMBER) {
264 snprintf(str_val, sizeof(str_val), "%.f", num_val);
265 av_metadata_set2(&s->metadata, key, str_val, 0);
266 if(!strcmp(key, "duration")) s->duration = num_val * AV_TIME_BASE;
267 else if(!strcmp(key, "videodatarate") && vcodec && 0 <= (int)(num_val * 1024.0))
268 vcodec->bit_rate = num_val * 1024.0;
269 else if(!strcmp(key, "audiodatarate") && acodec && 0 <= (int)(num_val * 1024.0))
270 acodec->bit_rate = num_val * 1024.0;
271 } else if (amf_type == AMF_DATA_TYPE_STRING)
272 av_metadata_set2(&s->metadata, key, str_val, 0);
278 static int flv_read_metabody(AVFormatContext *s, int64_t next_pos) {
280 AVStream *stream, *astream, *vstream;
283 char buffer[11]; //only needs to hold the string "onMetaData". Anything longer is something we don't want.
289 //first object needs to be "onMetaData" string
291 if(type != AMF_DATA_TYPE_STRING || amf_get_string(ioc, buffer, sizeof(buffer)) < 0 || strcmp(buffer, "onMetaData"))
294 //find the streams now so that amf_parse_object doesn't need to do the lookup every time it is called.
295 for(i = 0; i < s->nb_streams; i++) {
296 stream = s->streams[i];
297 if (stream->codec->codec_type == AVMEDIA_TYPE_AUDIO) astream = stream;
298 else if(stream->codec->codec_type == AVMEDIA_TYPE_VIDEO) vstream = stream;
301 //parse the second object (we want a mixed array)
302 if(amf_parse_object(s, astream, vstream, buffer, next_pos, 0) < 0)
308 static AVStream *create_stream(AVFormatContext *s, int is_audio){
309 AVStream *st = av_new_stream(s, is_audio);
312 st->codec->codec_type = is_audio ? AVMEDIA_TYPE_AUDIO : AVMEDIA_TYPE_VIDEO;
313 av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
317 static int flv_read_header(AVFormatContext *s,
318 AVFormatParameters *ap)
323 flags = avio_r8(s->pb);
324 /* old flvtool cleared this field */
325 /* FIXME: better fix needed */
327 flags = FLV_HEADER_FLAG_HASVIDEO | FLV_HEADER_FLAG_HASAUDIO;
328 av_log(s, AV_LOG_WARNING, "Broken FLV file, which says no streams present, this might fail\n");
331 if((flags & (FLV_HEADER_FLAG_HASVIDEO|FLV_HEADER_FLAG_HASAUDIO))
332 != (FLV_HEADER_FLAG_HASVIDEO|FLV_HEADER_FLAG_HASAUDIO))
333 s->ctx_flags |= AVFMTCTX_NOHEADER;
335 if(flags & FLV_HEADER_FLAG_HASVIDEO){
336 if(!create_stream(s, 0))
337 return AVERROR(ENOMEM);
339 if(flags & FLV_HEADER_FLAG_HASAUDIO){
340 if(!create_stream(s, 1))
341 return AVERROR(ENOMEM);
344 offset = avio_rb32(s->pb);
345 avio_seek(s->pb, offset, SEEK_SET);
353 static int flv_get_extradata(AVFormatContext *s, AVStream *st, int size)
355 av_free(st->codec->extradata);
356 st->codec->extradata = av_mallocz(size + FF_INPUT_BUFFER_PADDING_SIZE);
357 if (!st->codec->extradata)
358 return AVERROR(ENOMEM);
359 st->codec->extradata_size = size;
360 avio_read(s->pb, st->codec->extradata, st->codec->extradata_size);
364 static int flv_read_packet(AVFormatContext *s, AVPacket *pkt)
366 FLVContext *flv = s->priv_data;
367 int ret, i, type, size, flags, is_audio;
369 int64_t dts, pts = AV_NOPTS_VALUE;
372 for(;;avio_skip(s->pb, 4)){ /* pkt size is repeated at end. skip it */
373 pos = avio_tell(s->pb);
374 type = avio_r8(s->pb);
375 size = avio_rb24(s->pb);
376 dts = avio_rb24(s->pb);
377 dts |= avio_r8(s->pb) << 24;
378 av_dlog(s, "type:%d, size:%d, dts:%"PRId64"\n", type, size, dts);
381 avio_skip(s->pb, 3); /* stream id, always 0 */
387 next= size + avio_tell(s->pb);
389 if (type == FLV_TAG_TYPE_AUDIO) {
391 flags = avio_r8(s->pb);
393 } else if (type == FLV_TAG_TYPE_VIDEO) {
395 flags = avio_r8(s->pb);
397 if ((flags & 0xf0) == 0x50) /* video info / command frame */
400 if (type == FLV_TAG_TYPE_META && size > 13+1+4)
401 flv_read_metabody(s, next);
402 else /* skip packet */
403 av_log(s, AV_LOG_DEBUG, "skipping flv packet: type %d, size %d, flags %d\n", type, size, flags);
405 avio_seek(s->pb, next, SEEK_SET);
409 /* skip empty data packets */
413 /* now find stream */
414 for(i=0;i<s->nb_streams;i++) {
416 if (st->id == is_audio)
419 if(i == s->nb_streams){
420 av_log(s, AV_LOG_ERROR, "invalid stream\n");
421 st= create_stream(s, is_audio);
422 s->ctx_flags &= ~AVFMTCTX_NOHEADER;
424 av_dlog(s, "%d %X %d \n", is_audio, flags, st->discard);
425 if( (st->discard >= AVDISCARD_NONKEY && !((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY || is_audio))
426 ||(st->discard >= AVDISCARD_BIDIR && ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_DISP_INTER && !is_audio))
427 || st->discard >= AVDISCARD_ALL
429 avio_seek(s->pb, next, SEEK_SET);
432 if ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY)
433 av_add_index_entry(st, pos, dts, size, 0, AVINDEX_KEYFRAME);
437 // if not streamed and no duration from metadata then seek to end to find the duration from the timestamps
438 if(s->pb->seekable && (!s->duration || s->duration==AV_NOPTS_VALUE)){
440 const int64_t pos= avio_tell(s->pb);
441 const int64_t fsize= avio_size(s->pb);
442 avio_seek(s->pb, fsize-4, SEEK_SET);
443 size= avio_rb32(s->pb);
444 avio_seek(s->pb, fsize-3-size, SEEK_SET);
445 if(size == avio_rb24(s->pb) + 11){
446 uint32_t ts = avio_rb24(s->pb);
447 ts |= avio_r8(s->pb) << 24;
448 s->duration = ts * (int64_t)AV_TIME_BASE / 1000;
450 avio_seek(s->pb, pos, SEEK_SET);
454 if(!st->codec->channels || !st->codec->sample_rate || !st->codec->bits_per_coded_sample) {
455 st->codec->channels = (flags & FLV_AUDIO_CHANNEL_MASK) == FLV_STEREO ? 2 : 1;
456 st->codec->sample_rate = (44100 << ((flags & FLV_AUDIO_SAMPLERATE_MASK) >> FLV_AUDIO_SAMPLERATE_OFFSET) >> 3);
457 st->codec->bits_per_coded_sample = (flags & FLV_AUDIO_SAMPLESIZE_MASK) ? 16 : 8;
459 if(!st->codec->codec_id){
460 flv_set_audio_codec(s, st, flags & FLV_AUDIO_CODECID_MASK);
463 size -= flv_set_video_codec(s, st, flags & FLV_VIDEO_CODECID_MASK);
466 if (st->codec->codec_id == CODEC_ID_AAC ||
467 st->codec->codec_id == CODEC_ID_H264) {
468 int type = avio_r8(s->pb);
470 if (st->codec->codec_id == CODEC_ID_H264) {
471 int32_t cts = (avio_rb24(s->pb)+0xff800000)^0xff800000; // sign extension
473 if (cts < 0) { // dts are wrong
475 av_log(s, AV_LOG_WARNING, "negative cts, previous timestamps might be wrong\n");
478 dts = AV_NOPTS_VALUE;
481 if ((ret = flv_get_extradata(s, st, size)) < 0)
483 if (st->codec->codec_id == CODEC_ID_AAC) {
484 MPEG4AudioConfig cfg;
485 ff_mpeg4audio_get_config(&cfg, st->codec->extradata,
486 st->codec->extradata_size);
487 st->codec->channels = cfg.channels;
488 if (cfg.ext_sample_rate)
489 st->codec->sample_rate = cfg.ext_sample_rate;
491 st->codec->sample_rate = cfg.sample_rate;
492 av_dlog(s, "mp4a config channels %d sample rate %d\n",
493 st->codec->channels, st->codec->sample_rate);
496 ret = AVERROR(EAGAIN);
501 /* skip empty data packets */
503 ret = AVERROR(EAGAIN);
507 ret= av_get_packet(s->pb, pkt, size);
511 /* note: we need to modify the packet size here to handle the last
515 pkt->pts = pts == AV_NOPTS_VALUE ? dts : pts;
516 pkt->stream_index = st->index;
518 if (is_audio || ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY))
519 pkt->flags |= AV_PKT_FLAG_KEY;
526 static int flv_read_seek(AVFormatContext *s, int stream_index,
527 int64_t ts, int flags)
529 return avio_seek_time(s->pb, stream_index, ts, flags);
532 #if 0 /* don't know enough to implement this */
533 static int flv_read_seek2(AVFormatContext *s, int stream_index,
534 int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
536 int ret = AVERROR(ENOSYS);
538 if (ts - min_ts > (uint64_t)(max_ts - ts)) flags |= AVSEEK_FLAG_BACKWARD;
540 if (!s->pb->seekable) {
541 if (stream_index < 0) {
542 stream_index = av_find_default_stream_index(s);
543 if (stream_index < 0)
546 /* timestamp for default must be expressed in AV_TIME_BASE units */
547 ts = av_rescale_rnd(ts, 1000, AV_TIME_BASE,
548 flags & AVSEEK_FLAG_BACKWARD ? AV_ROUND_DOWN : AV_ROUND_UP);
550 ret = avio_seek_time(s->pb, stream_index, ts, flags);
553 if (ret == AVERROR(ENOSYS))
554 ret = av_seek_frame(s, stream_index, ts, flags);
559 AVInputFormat ff_flv_demuxer = {
561 NULL_IF_CONFIG_SMALL("FLV format"),
566 .read_seek = flv_read_seek,
568 .read_seek2 = flv_read_seek2,
571 .value = CODEC_ID_FLV1,