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 "libavutil/dict.h"
29 #include "libavutil/intfloat_readwrite.h"
30 #include "libavutil/mathematics.h"
31 #include "libavcodec/bytestream.h"
32 #include "libavcodec/mpeg4audio.h"
34 #include "avio_internal.h"
38 int wrong_dts; ///< wrong dts due to negative cts
41 static int flv_probe(AVProbeData *p)
46 if (d[0] == 'F' && d[1] == 'L' && d[2] == 'V' && d[3] < 5 && d[5]==0 && AV_RB32(d+5)>8) {
47 return AVPROBE_SCORE_MAX;
52 static void flv_set_audio_codec(AVFormatContext *s, AVStream *astream, int flv_codecid) {
53 AVCodecContext *acodec = astream->codec;
55 //no distinction between S16 and S8 PCM codec flags
57 acodec->codec_id = acodec->bits_per_coded_sample == 8 ? CODEC_ID_PCM_U8 :
64 case FLV_CODECID_PCM_LE:
65 acodec->codec_id = acodec->bits_per_coded_sample == 8 ? CODEC_ID_PCM_U8 : CODEC_ID_PCM_S16LE; break;
66 case FLV_CODECID_AAC : acodec->codec_id = CODEC_ID_AAC; break;
67 case FLV_CODECID_ADPCM: acodec->codec_id = CODEC_ID_ADPCM_SWF; break;
68 case FLV_CODECID_SPEEX:
69 acodec->codec_id = CODEC_ID_SPEEX;
70 acodec->sample_rate = 16000;
72 case FLV_CODECID_MP3 : acodec->codec_id = CODEC_ID_MP3 ; astream->need_parsing = AVSTREAM_PARSE_FULL; break;
73 case FLV_CODECID_NELLYMOSER_8KHZ_MONO:
74 acodec->sample_rate = 8000; //in case metadata does not otherwise declare samplerate
75 acodec->codec_id = CODEC_ID_NELLYMOSER;
77 case FLV_CODECID_NELLYMOSER_16KHZ_MONO:
78 acodec->sample_rate = 16000;
79 acodec->codec_id = CODEC_ID_NELLYMOSER;
81 case FLV_CODECID_NELLYMOSER:
82 acodec->codec_id = CODEC_ID_NELLYMOSER;
85 av_log(s, AV_LOG_INFO, "Unsupported audio codec (%x)\n", flv_codecid >> FLV_AUDIO_CODECID_OFFSET);
86 acodec->codec_tag = flv_codecid >> FLV_AUDIO_CODECID_OFFSET;
90 static int flv_set_video_codec(AVFormatContext *s, AVStream *vstream, int flv_codecid) {
91 AVCodecContext *vcodec = vstream->codec;
93 case FLV_CODECID_H263 : vcodec->codec_id = CODEC_ID_FLV1 ; break;
94 case FLV_CODECID_SCREEN: vcodec->codec_id = CODEC_ID_FLASHSV; break;
95 case FLV_CODECID_SCREEN2: vcodec->codec_id = CODEC_ID_FLASHSV2; break;
96 case FLV_CODECID_VP6 : vcodec->codec_id = CODEC_ID_VP6F ;
97 case FLV_CODECID_VP6A :
98 if(flv_codecid == FLV_CODECID_VP6A)
99 vcodec->codec_id = CODEC_ID_VP6A;
100 if(vcodec->extradata_size != 1) {
101 vcodec->extradata_size = 1;
102 vcodec->extradata = av_malloc(1);
104 vcodec->extradata[0] = avio_r8(s->pb);
105 return 1; // 1 byte body size adjustment for flv_read_packet()
106 case FLV_CODECID_H264:
107 vcodec->codec_id = CODEC_ID_H264;
108 return 3; // not 4, reading packet type will consume one byte
110 av_log(s, AV_LOG_INFO, "Unsupported video codec (%x)\n", flv_codecid);
111 vcodec->codec_tag = flv_codecid;
117 static int amf_get_string(AVIOContext *ioc, char *buffer, int buffsize) {
118 int length = avio_rb16(ioc);
119 if(length >= buffsize) {
120 avio_skip(ioc, length);
124 avio_read(ioc, buffer, length);
126 buffer[length] = '\0';
131 static int parse_keyframes_index(AVFormatContext *s, AVIOContext *ioc, AVStream *vstream, int64_t max_pos) {
132 unsigned int timeslen = 0, fileposlen = 0, i;
134 int64_t *times = NULL;
135 int64_t *filepositions = NULL;
136 int ret = AVERROR(ENOSYS);
137 int64_t initial_pos = avio_tell(ioc);
139 while (avio_tell(ioc) < max_pos - 2 && amf_get_string(ioc, str_val, sizeof(str_val)) > 0) {
140 int64_t** current_array;
141 unsigned int arraylen;
143 // Expect array object in context
144 if (avio_r8(ioc) != AMF_DATA_TYPE_ARRAY)
147 arraylen = avio_rb32(ioc);
151 if (!strcmp(KEYFRAMES_TIMESTAMP_TAG , str_val) && !times){
152 current_array= ×
154 }else if (!strcmp(KEYFRAMES_BYTEOFFSET_TAG, str_val) && !filepositions){
155 current_array= &filepositions;
156 fileposlen= arraylen;
157 }else // unexpected metatag inside keyframes, will not use such metadata for indexing
160 if (!(*current_array = av_mallocz(sizeof(**current_array) * arraylen))) {
161 ret = AVERROR(ENOMEM);
165 for (i = 0; i < arraylen && avio_tell(ioc) < max_pos - 1; i++) {
166 if (avio_r8(ioc) != AMF_DATA_TYPE_NUMBER)
168 current_array[0][i] = av_int2dbl(avio_rb64(ioc));
170 if (times && filepositions) {
171 // All done, exiting at a position allowing amf_parse_object
172 // to finish parsing the object
178 if (timeslen == fileposlen) {
179 for(i = 0; i < timeslen; i++)
180 av_add_index_entry(vstream, filepositions[i], times[i]*1000, 0, 0, AVINDEX_KEYFRAME);
182 av_log(s, AV_LOG_WARNING, "Invalid keyframes object, skipping.\n");
186 av_freep(&filepositions);
187 avio_seek(ioc, initial_pos, SEEK_SET);
191 static int amf_parse_object(AVFormatContext *s, AVStream *astream, AVStream *vstream, const char *key, int64_t max_pos, int depth) {
192 AVCodecContext *acodec, *vcodec;
194 AMFDataType amf_type;
201 amf_type = avio_r8(ioc);
204 case AMF_DATA_TYPE_NUMBER:
205 num_val = av_int2dbl(avio_rb64(ioc)); break;
206 case AMF_DATA_TYPE_BOOL:
207 num_val = avio_r8(ioc); break;
208 case AMF_DATA_TYPE_STRING:
209 if(amf_get_string(ioc, str_val, sizeof(str_val)) < 0)
212 case AMF_DATA_TYPE_OBJECT: {
215 if (ioc->seekable && key && !strcmp(KEYFRAMES_TAG, key) && depth == 1)
216 if (parse_keyframes_index(s, ioc, vstream, max_pos) < 0)
217 av_log(s, AV_LOG_ERROR, "Keyframe index parsing failed\n");
219 while(avio_tell(ioc) < max_pos - 2 && (keylen = avio_rb16(ioc))) {
220 avio_skip(ioc, keylen); //skip key string
221 if(amf_parse_object(s, NULL, NULL, NULL, max_pos, depth + 1) < 0)
222 return -1; //if we couldn't skip, bomb out.
224 if(avio_r8(ioc) != AMF_END_OF_OBJECT)
228 case AMF_DATA_TYPE_NULL:
229 case AMF_DATA_TYPE_UNDEFINED:
230 case AMF_DATA_TYPE_UNSUPPORTED:
231 break; //these take up no additional space
232 case AMF_DATA_TYPE_MIXEDARRAY:
233 avio_skip(ioc, 4); //skip 32-bit max array index
234 while(avio_tell(ioc) < max_pos - 2 && amf_get_string(ioc, str_val, sizeof(str_val)) > 0) {
235 //this is the only case in which we would want a nested parse to not skip over the object
236 if(amf_parse_object(s, astream, vstream, str_val, max_pos, depth + 1) < 0)
239 if(avio_r8(ioc) != AMF_END_OF_OBJECT)
242 case AMF_DATA_TYPE_ARRAY: {
243 unsigned int arraylen, i;
245 arraylen = avio_rb32(ioc);
246 for(i = 0; i < arraylen && avio_tell(ioc) < max_pos - 1; i++) {
247 if(amf_parse_object(s, NULL, NULL, NULL, max_pos, depth + 1) < 0)
248 return -1; //if we couldn't skip, bomb out.
252 case AMF_DATA_TYPE_DATE:
253 avio_skip(ioc, 8 + 2); //timestamp (double) and UTC offset (int16)
255 default: //unsupported type, we couldn't skip
259 if(depth == 1 && key) { //only look for metadata values when we are not nested and key != NULL
260 acodec = astream ? astream->codec : NULL;
261 vcodec = vstream ? vstream->codec : NULL;
263 if(amf_type == AMF_DATA_TYPE_BOOL) {
264 av_strlcpy(str_val, num_val > 0 ? "true" : "false", sizeof(str_val));
265 av_dict_set(&s->metadata, key, str_val, 0);
266 } else if(amf_type == AMF_DATA_TYPE_NUMBER) {
267 snprintf(str_val, sizeof(str_val), "%.f", num_val);
268 av_dict_set(&s->metadata, key, str_val, 0);
269 if(!strcmp(key, "duration")) s->duration = num_val * AV_TIME_BASE;
270 else if(!strcmp(key, "videodatarate") && vcodec && 0 <= (int)(num_val * 1024.0))
271 vcodec->bit_rate = num_val * 1024.0;
272 else if(!strcmp(key, "audiodatarate") && acodec && 0 <= (int)(num_val * 1024.0))
273 acodec->bit_rate = num_val * 1024.0;
274 } else if (amf_type == AMF_DATA_TYPE_STRING)
275 av_dict_set(&s->metadata, key, str_val, 0);
281 static int flv_read_metabody(AVFormatContext *s, int64_t next_pos) {
283 AVStream *stream, *astream, *vstream;
286 char buffer[11]; //only needs to hold the string "onMetaData". Anything longer is something we don't want.
292 //first object needs to be "onMetaData" string
294 if(type != AMF_DATA_TYPE_STRING || amf_get_string(ioc, buffer, sizeof(buffer)) < 0 || strcmp(buffer, "onMetaData"))
297 //find the streams now so that amf_parse_object doesn't need to do the lookup every time it is called.
298 for(i = 0; i < s->nb_streams; i++) {
299 stream = s->streams[i];
300 if (stream->codec->codec_type == AVMEDIA_TYPE_AUDIO) astream = stream;
301 else if(stream->codec->codec_type == AVMEDIA_TYPE_VIDEO) vstream = stream;
304 //parse the second object (we want a mixed array)
305 if(amf_parse_object(s, astream, vstream, buffer, next_pos, 0) < 0)
311 static AVStream *create_stream(AVFormatContext *s, int is_audio){
312 AVStream *st = av_new_stream(s, is_audio);
315 st->codec->codec_type = is_audio ? AVMEDIA_TYPE_AUDIO : AVMEDIA_TYPE_VIDEO;
316 av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
320 static int flv_read_header(AVFormatContext *s,
321 AVFormatParameters *ap)
326 flags = avio_r8(s->pb);
327 /* old flvtool cleared this field */
328 /* FIXME: better fix needed */
330 flags = FLV_HEADER_FLAG_HASVIDEO | FLV_HEADER_FLAG_HASAUDIO;
331 av_log(s, AV_LOG_WARNING, "Broken FLV file, which says no streams present, this might fail\n");
334 if((flags & (FLV_HEADER_FLAG_HASVIDEO|FLV_HEADER_FLAG_HASAUDIO))
335 != (FLV_HEADER_FLAG_HASVIDEO|FLV_HEADER_FLAG_HASAUDIO))
336 s->ctx_flags |= AVFMTCTX_NOHEADER;
338 if(flags & FLV_HEADER_FLAG_HASVIDEO){
339 if(!create_stream(s, 0))
340 return AVERROR(ENOMEM);
342 if(flags & FLV_HEADER_FLAG_HASAUDIO){
343 if(!create_stream(s, 1))
344 return AVERROR(ENOMEM);
347 offset = avio_rb32(s->pb);
348 avio_seek(s->pb, offset, SEEK_SET);
356 static int flv_get_extradata(AVFormatContext *s, AVStream *st, int size)
358 av_free(st->codec->extradata);
359 st->codec->extradata = av_mallocz(size + FF_INPUT_BUFFER_PADDING_SIZE);
360 if (!st->codec->extradata)
361 return AVERROR(ENOMEM);
362 st->codec->extradata_size = size;
363 avio_read(s->pb, st->codec->extradata, st->codec->extradata_size);
367 static int flv_read_packet(AVFormatContext *s, AVPacket *pkt)
369 FLVContext *flv = s->priv_data;
370 int ret, i, type, size, flags, is_audio;
372 int64_t dts, pts = AV_NOPTS_VALUE;
375 for(;;avio_skip(s->pb, 4)){ /* pkt size is repeated at end. skip it */
376 pos = avio_tell(s->pb);
377 type = avio_r8(s->pb);
378 size = avio_rb24(s->pb);
379 dts = avio_rb24(s->pb);
380 dts |= avio_r8(s->pb) << 24;
381 av_dlog(s, "type:%d, size:%d, dts:%"PRId64"\n", type, size, dts);
384 avio_skip(s->pb, 3); /* stream id, always 0 */
390 next= size + avio_tell(s->pb);
392 if (type == FLV_TAG_TYPE_AUDIO) {
394 flags = avio_r8(s->pb);
396 } else if (type == FLV_TAG_TYPE_VIDEO) {
398 flags = avio_r8(s->pb);
400 if ((flags & 0xf0) == 0x50) /* video info / command frame */
403 if (type == FLV_TAG_TYPE_META && size > 13+1+4)
404 flv_read_metabody(s, next);
405 else /* skip packet */
406 av_log(s, AV_LOG_DEBUG, "skipping flv packet: type %d, size %d, flags %d\n", type, size, flags);
408 avio_seek(s->pb, next, SEEK_SET);
412 /* skip empty data packets */
416 /* now find stream */
417 for(i=0;i<s->nb_streams;i++) {
419 if (st->id == is_audio)
422 if(i == s->nb_streams){
423 av_log(s, AV_LOG_ERROR, "invalid stream\n");
424 st= create_stream(s, is_audio);
425 s->ctx_flags &= ~AVFMTCTX_NOHEADER;
427 av_dlog(s, "%d %X %d \n", is_audio, flags, st->discard);
428 if( (st->discard >= AVDISCARD_NONKEY && !((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY || is_audio))
429 ||(st->discard >= AVDISCARD_BIDIR && ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_DISP_INTER && !is_audio))
430 || st->discard >= AVDISCARD_ALL
432 avio_seek(s->pb, next, SEEK_SET);
435 if ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY)
436 av_add_index_entry(st, pos, dts, size, 0, AVINDEX_KEYFRAME);
440 // if not streamed and no duration from metadata then seek to end to find the duration from the timestamps
441 if(s->pb->seekable && (!s->duration || s->duration==AV_NOPTS_VALUE)){
443 const int64_t pos= avio_tell(s->pb);
444 const int64_t fsize= avio_size(s->pb);
445 avio_seek(s->pb, fsize-4, SEEK_SET);
446 size= avio_rb32(s->pb);
447 avio_seek(s->pb, fsize-3-size, SEEK_SET);
448 if(size == avio_rb24(s->pb) + 11){
449 uint32_t ts = avio_rb24(s->pb);
450 ts |= avio_r8(s->pb) << 24;
451 s->duration = ts * (int64_t)AV_TIME_BASE / 1000;
453 avio_seek(s->pb, pos, SEEK_SET);
457 if(!st->codec->channels || !st->codec->sample_rate || !st->codec->bits_per_coded_sample) {
458 st->codec->channels = (flags & FLV_AUDIO_CHANNEL_MASK) == FLV_STEREO ? 2 : 1;
459 st->codec->sample_rate = (44100 << ((flags & FLV_AUDIO_SAMPLERATE_MASK) >> FLV_AUDIO_SAMPLERATE_OFFSET) >> 3);
460 st->codec->bits_per_coded_sample = (flags & FLV_AUDIO_SAMPLESIZE_MASK) ? 16 : 8;
462 if(!st->codec->codec_id){
463 flv_set_audio_codec(s, st, flags & FLV_AUDIO_CODECID_MASK);
466 size -= flv_set_video_codec(s, st, flags & FLV_VIDEO_CODECID_MASK);
469 if (st->codec->codec_id == CODEC_ID_AAC ||
470 st->codec->codec_id == CODEC_ID_H264) {
471 int type = avio_r8(s->pb);
473 if (st->codec->codec_id == CODEC_ID_H264) {
474 int32_t cts = (avio_rb24(s->pb)+0xff800000)^0xff800000; // sign extension
476 if (cts < 0) { // dts are wrong
478 av_log(s, AV_LOG_WARNING, "negative cts, previous timestamps might be wrong\n");
481 dts = AV_NOPTS_VALUE;
484 if ((ret = flv_get_extradata(s, st, size)) < 0)
486 if (st->codec->codec_id == CODEC_ID_AAC) {
487 MPEG4AudioConfig cfg;
488 ff_mpeg4audio_get_config(&cfg, st->codec->extradata,
489 st->codec->extradata_size);
490 st->codec->channels = cfg.channels;
491 if (cfg.ext_sample_rate)
492 st->codec->sample_rate = cfg.ext_sample_rate;
494 st->codec->sample_rate = cfg.sample_rate;
495 av_dlog(s, "mp4a config channels %d sample rate %d\n",
496 st->codec->channels, st->codec->sample_rate);
499 ret = AVERROR(EAGAIN);
504 /* skip empty data packets */
506 ret = AVERROR(EAGAIN);
510 ret= av_get_packet(s->pb, pkt, size);
514 /* note: we need to modify the packet size here to handle the last
518 pkt->pts = pts == AV_NOPTS_VALUE ? dts : pts;
519 pkt->stream_index = st->index;
521 if (is_audio || ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY))
522 pkt->flags |= AV_PKT_FLAG_KEY;
529 static int flv_read_seek(AVFormatContext *s, int stream_index,
530 int64_t ts, int flags)
532 return avio_seek_time(s->pb, stream_index, ts, flags);
535 #if 0 /* don't know enough to implement this */
536 static int flv_read_seek2(AVFormatContext *s, int stream_index,
537 int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
539 int ret = AVERROR(ENOSYS);
541 if (ts - min_ts > (uint64_t)(max_ts - ts)) flags |= AVSEEK_FLAG_BACKWARD;
543 if (!s->pb->seekable) {
544 if (stream_index < 0) {
545 stream_index = av_find_default_stream_index(s);
546 if (stream_index < 0)
549 /* timestamp for default must be expressed in AV_TIME_BASE units */
550 ts = av_rescale_rnd(ts, 1000, AV_TIME_BASE,
551 flags & AVSEEK_FLAG_BACKWARD ? AV_ROUND_DOWN : AV_ROUND_UP);
553 ret = avio_seek_time(s->pb, stream_index, ts, flags);
556 if (ret == AVERROR(ENOSYS))
557 ret = av_seek_frame(s, stream_index, ts, flags);
562 AVInputFormat ff_flv_demuxer = {
564 .long_name = NULL_IF_CONFIG_SMALL("FLV format"),
565 .priv_data_size = sizeof(FLVContext),
566 .read_probe = flv_probe,
567 .read_header = flv_read_header,
568 .read_packet = flv_read_packet,
569 .read_seek = flv_read_seek,
571 .read_seek2 = flv_read_seek2,
574 .value = CODEC_ID_FLV1,