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 "libavcodec/bytestream.h"
31 #include "libavcodec/mpeg4audio.h"
33 #include "avio_internal.h"
37 int wrong_dts; ///< wrong dts due to negative cts
40 static int flv_probe(AVProbeData *p)
45 if (d[0] == 'F' && d[1] == 'L' && d[2] == 'V' && d[3] < 5 && d[5]==0 && AV_RB32(d+5)>8) {
46 return AVPROBE_SCORE_MAX;
51 static void flv_set_audio_codec(AVFormatContext *s, AVStream *astream, int flv_codecid) {
52 AVCodecContext *acodec = astream->codec;
54 //no distinction between S16 and S8 PCM codec flags
56 acodec->codec_id = acodec->bits_per_coded_sample == 8 ? CODEC_ID_PCM_U8 :
63 case FLV_CODECID_PCM_LE:
64 acodec->codec_id = acodec->bits_per_coded_sample == 8 ? CODEC_ID_PCM_U8 : CODEC_ID_PCM_S16LE; break;
65 case FLV_CODECID_AAC : acodec->codec_id = CODEC_ID_AAC; break;
66 case FLV_CODECID_ADPCM: acodec->codec_id = CODEC_ID_ADPCM_SWF; break;
67 case FLV_CODECID_SPEEX:
68 acodec->codec_id = CODEC_ID_SPEEX;
69 acodec->sample_rate = 16000;
71 case FLV_CODECID_MP3 : acodec->codec_id = CODEC_ID_MP3 ; astream->need_parsing = AVSTREAM_PARSE_FULL; break;
72 case FLV_CODECID_NELLYMOSER_8KHZ_MONO:
73 acodec->sample_rate = 8000; //in case metadata does not otherwise declare samplerate
74 acodec->codec_id = CODEC_ID_NELLYMOSER;
76 case FLV_CODECID_NELLYMOSER_16KHZ_MONO:
77 acodec->sample_rate = 16000;
78 acodec->codec_id = CODEC_ID_NELLYMOSER;
80 case FLV_CODECID_NELLYMOSER:
81 acodec->codec_id = CODEC_ID_NELLYMOSER;
84 av_log(s, AV_LOG_INFO, "Unsupported audio codec (%x)\n", flv_codecid >> FLV_AUDIO_CODECID_OFFSET);
85 acodec->codec_tag = flv_codecid >> FLV_AUDIO_CODECID_OFFSET;
89 static int flv_set_video_codec(AVFormatContext *s, AVStream *vstream, int flv_codecid) {
90 AVCodecContext *vcodec = vstream->codec;
92 case FLV_CODECID_H263 : vcodec->codec_id = CODEC_ID_FLV1 ; break;
93 case FLV_CODECID_SCREEN: vcodec->codec_id = CODEC_ID_FLASHSV; break;
94 case FLV_CODECID_SCREEN2: vcodec->codec_id = CODEC_ID_FLASHSV2; break;
95 case FLV_CODECID_VP6 : vcodec->codec_id = CODEC_ID_VP6F ;
96 case FLV_CODECID_VP6A :
97 if(flv_codecid == FLV_CODECID_VP6A)
98 vcodec->codec_id = CODEC_ID_VP6A;
99 if(vcodec->extradata_size != 1) {
100 vcodec->extradata_size = 1;
101 vcodec->extradata = av_malloc(1);
103 vcodec->extradata[0] = avio_r8(s->pb);
104 return 1; // 1 byte body size adjustment for flv_read_packet()
105 case FLV_CODECID_H264:
106 vcodec->codec_id = CODEC_ID_H264;
107 return 3; // not 4, reading packet type will consume one byte
109 av_log(s, AV_LOG_INFO, "Unsupported video codec (%x)\n", flv_codecid);
110 vcodec->codec_tag = flv_codecid;
116 static int amf_get_string(AVIOContext *ioc, char *buffer, int buffsize) {
117 int length = avio_rb16(ioc);
118 if(length >= buffsize) {
119 avio_skip(ioc, length);
123 avio_read(ioc, buffer, length);
125 buffer[length] = '\0';
130 static int parse_keyframes_index(AVFormatContext *s, AVIOContext *ioc, AVStream *vstream, int64_t max_pos) {
131 unsigned int timeslen = 0, fileposlen = 0, i;
133 int64_t *times = NULL;
134 int64_t *filepositions = NULL;
135 int ret = AVERROR(ENOSYS);
136 int64_t initial_pos = avio_tell(ioc);
138 while (avio_tell(ioc) < max_pos - 2 && amf_get_string(ioc, str_val, sizeof(str_val)) > 0) {
139 int64_t** current_array;
140 unsigned int arraylen;
142 // Expect array object in context
143 if (avio_r8(ioc) != AMF_DATA_TYPE_ARRAY)
146 arraylen = avio_rb32(ioc);
150 if (!strcmp(KEYFRAMES_TIMESTAMP_TAG , str_val) && !times){
151 current_array= ×
153 }else if (!strcmp(KEYFRAMES_BYTEOFFSET_TAG, str_val) && !filepositions){
154 current_array= &filepositions;
155 fileposlen= arraylen;
156 }else // unexpected metatag inside keyframes, will not use such metadata for indexing
159 if (!(*current_array = av_mallocz(sizeof(**current_array) * arraylen))) {
160 ret = AVERROR(ENOMEM);
164 for (i = 0; i < arraylen && avio_tell(ioc) < max_pos - 1; i++) {
165 if (avio_r8(ioc) != AMF_DATA_TYPE_NUMBER)
167 current_array[0][i] = av_int2dbl(avio_rb64(ioc));
169 if (times && filepositions) {
170 // All done, exiting at a position allowing amf_parse_object
171 // to finish parsing the object
177 if (timeslen == fileposlen) {
178 for(i = 0; i < timeslen; i++)
179 av_add_index_entry(vstream, filepositions[i], times[i]*1000, 0, 0, AVINDEX_KEYFRAME);
181 av_log(s, AV_LOG_WARNING, "Invalid keyframes object, skipping.\n");
185 av_freep(&filepositions);
186 avio_seek(ioc, initial_pos, SEEK_SET);
190 static int amf_parse_object(AVFormatContext *s, AVStream *astream, AVStream *vstream, const char *key, int64_t max_pos, int depth) {
191 AVCodecContext *acodec, *vcodec;
193 AMFDataType amf_type;
200 amf_type = avio_r8(ioc);
203 case AMF_DATA_TYPE_NUMBER:
204 num_val = av_int2dbl(avio_rb64(ioc)); break;
205 case AMF_DATA_TYPE_BOOL:
206 num_val = avio_r8(ioc); break;
207 case AMF_DATA_TYPE_STRING:
208 if(amf_get_string(ioc, str_val, sizeof(str_val)) < 0)
211 case AMF_DATA_TYPE_OBJECT: {
214 if (ioc->seekable && key && !strcmp(KEYFRAMES_TAG, key) && depth == 1)
215 if (parse_keyframes_index(s, ioc, vstream, max_pos) < 0)
216 av_log(s, AV_LOG_ERROR, "Keyframe index parsing failed\n");
218 while(avio_tell(ioc) < max_pos - 2 && (keylen = avio_rb16(ioc))) {
219 avio_skip(ioc, keylen); //skip key string
220 if(amf_parse_object(s, NULL, NULL, NULL, max_pos, depth + 1) < 0)
221 return -1; //if we couldn't skip, bomb out.
223 if(avio_r8(ioc) != AMF_END_OF_OBJECT)
227 case AMF_DATA_TYPE_NULL:
228 case AMF_DATA_TYPE_UNDEFINED:
229 case AMF_DATA_TYPE_UNSUPPORTED:
230 break; //these take up no additional space
231 case AMF_DATA_TYPE_MIXEDARRAY:
232 avio_skip(ioc, 4); //skip 32-bit max array index
233 while(avio_tell(ioc) < max_pos - 2 && amf_get_string(ioc, str_val, sizeof(str_val)) > 0) {
234 //this is the only case in which we would want a nested parse to not skip over the object
235 if(amf_parse_object(s, astream, vstream, str_val, max_pos, depth + 1) < 0)
238 if(avio_r8(ioc) != AMF_END_OF_OBJECT)
241 case AMF_DATA_TYPE_ARRAY: {
242 unsigned int arraylen, i;
244 arraylen = avio_rb32(ioc);
245 for(i = 0; i < arraylen && avio_tell(ioc) < max_pos - 1; i++) {
246 if(amf_parse_object(s, NULL, NULL, NULL, max_pos, depth + 1) < 0)
247 return -1; //if we couldn't skip, bomb out.
251 case AMF_DATA_TYPE_DATE:
252 avio_skip(ioc, 8 + 2); //timestamp (double) and UTC offset (int16)
254 default: //unsupported type, we couldn't skip
258 if(depth == 1 && key) { //only look for metadata values when we are not nested and key != NULL
259 acodec = astream ? astream->codec : NULL;
260 vcodec = vstream ? vstream->codec : NULL;
262 if(amf_type == AMF_DATA_TYPE_BOOL) {
263 av_strlcpy(str_val, num_val > 0 ? "true" : "false", sizeof(str_val));
264 av_dict_set(&s->metadata, key, str_val, 0);
265 } else if(amf_type == AMF_DATA_TYPE_NUMBER) {
266 snprintf(str_val, sizeof(str_val), "%.f", num_val);
267 av_dict_set(&s->metadata, key, str_val, 0);
268 if(!strcmp(key, "duration")) s->duration = num_val * AV_TIME_BASE;
269 else if(!strcmp(key, "videodatarate") && vcodec && 0 <= (int)(num_val * 1024.0))
270 vcodec->bit_rate = num_val * 1024.0;
271 else if(!strcmp(key, "audiodatarate") && acodec && 0 <= (int)(num_val * 1024.0))
272 acodec->bit_rate = num_val * 1024.0;
273 } else if (amf_type == AMF_DATA_TYPE_STRING)
274 av_dict_set(&s->metadata, key, str_val, 0);
280 static int flv_read_metabody(AVFormatContext *s, int64_t next_pos) {
282 AVStream *stream, *astream, *vstream;
285 char buffer[11]; //only needs to hold the string "onMetaData". Anything longer is something we don't want.
291 //first object needs to be "onMetaData" string
293 if(type != AMF_DATA_TYPE_STRING || amf_get_string(ioc, buffer, sizeof(buffer)) < 0 || strcmp(buffer, "onMetaData"))
296 //find the streams now so that amf_parse_object doesn't need to do the lookup every time it is called.
297 for(i = 0; i < s->nb_streams; i++) {
298 stream = s->streams[i];
299 if (stream->codec->codec_type == AVMEDIA_TYPE_AUDIO) astream = stream;
300 else if(stream->codec->codec_type == AVMEDIA_TYPE_VIDEO) vstream = stream;
303 //parse the second object (we want a mixed array)
304 if(amf_parse_object(s, astream, vstream, buffer, next_pos, 0) < 0)
310 static AVStream *create_stream(AVFormatContext *s, int is_audio){
311 AVStream *st = av_new_stream(s, is_audio);
314 st->codec->codec_type = is_audio ? AVMEDIA_TYPE_AUDIO : AVMEDIA_TYPE_VIDEO;
315 av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
319 static int flv_read_header(AVFormatContext *s,
320 AVFormatParameters *ap)
325 flags = avio_r8(s->pb);
326 /* old flvtool cleared this field */
327 /* FIXME: better fix needed */
329 flags = FLV_HEADER_FLAG_HASVIDEO | FLV_HEADER_FLAG_HASAUDIO;
330 av_log(s, AV_LOG_WARNING, "Broken FLV file, which says no streams present, this might fail\n");
333 if((flags & (FLV_HEADER_FLAG_HASVIDEO|FLV_HEADER_FLAG_HASAUDIO))
334 != (FLV_HEADER_FLAG_HASVIDEO|FLV_HEADER_FLAG_HASAUDIO))
335 s->ctx_flags |= AVFMTCTX_NOHEADER;
337 if(flags & FLV_HEADER_FLAG_HASVIDEO){
338 if(!create_stream(s, 0))
339 return AVERROR(ENOMEM);
341 if(flags & FLV_HEADER_FLAG_HASAUDIO){
342 if(!create_stream(s, 1))
343 return AVERROR(ENOMEM);
346 offset = avio_rb32(s->pb);
347 avio_seek(s->pb, offset, SEEK_SET);
355 static int flv_get_extradata(AVFormatContext *s, AVStream *st, int size)
357 av_free(st->codec->extradata);
358 st->codec->extradata = av_mallocz(size + FF_INPUT_BUFFER_PADDING_SIZE);
359 if (!st->codec->extradata)
360 return AVERROR(ENOMEM);
361 st->codec->extradata_size = size;
362 avio_read(s->pb, st->codec->extradata, st->codec->extradata_size);
366 static int flv_read_packet(AVFormatContext *s, AVPacket *pkt)
368 FLVContext *flv = s->priv_data;
369 int ret, i, type, size, flags, is_audio;
371 int64_t dts, pts = AV_NOPTS_VALUE;
374 for(;;avio_skip(s->pb, 4)){ /* pkt size is repeated at end. skip it */
375 pos = avio_tell(s->pb);
376 type = avio_r8(s->pb);
377 size = avio_rb24(s->pb);
378 dts = avio_rb24(s->pb);
379 dts |= avio_r8(s->pb) << 24;
380 av_dlog(s, "type:%d, size:%d, dts:%"PRId64"\n", type, size, dts);
383 avio_skip(s->pb, 3); /* stream id, always 0 */
389 next= size + avio_tell(s->pb);
391 if (type == FLV_TAG_TYPE_AUDIO) {
393 flags = avio_r8(s->pb);
395 } else if (type == FLV_TAG_TYPE_VIDEO) {
397 flags = avio_r8(s->pb);
399 if ((flags & 0xf0) == 0x50) /* video info / command frame */
402 if (type == FLV_TAG_TYPE_META && size > 13+1+4)
403 flv_read_metabody(s, next);
404 else /* skip packet */
405 av_log(s, AV_LOG_DEBUG, "skipping flv packet: type %d, size %d, flags %d\n", type, size, flags);
407 avio_seek(s->pb, next, SEEK_SET);
411 /* skip empty data packets */
415 /* now find stream */
416 for(i=0;i<s->nb_streams;i++) {
418 if (st->id == is_audio)
421 if(i == s->nb_streams){
422 av_log(s, AV_LOG_ERROR, "invalid stream\n");
423 st= create_stream(s, is_audio);
424 s->ctx_flags &= ~AVFMTCTX_NOHEADER;
426 av_dlog(s, "%d %X %d \n", is_audio, flags, st->discard);
427 if( (st->discard >= AVDISCARD_NONKEY && !((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY || is_audio))
428 ||(st->discard >= AVDISCARD_BIDIR && ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_DISP_INTER && !is_audio))
429 || st->discard >= AVDISCARD_ALL
431 avio_seek(s->pb, next, SEEK_SET);
434 if ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY)
435 av_add_index_entry(st, pos, dts, size, 0, AVINDEX_KEYFRAME);
439 // if not streamed and no duration from metadata then seek to end to find the duration from the timestamps
440 if(s->pb->seekable && (!s->duration || s->duration==AV_NOPTS_VALUE)){
442 const int64_t pos= avio_tell(s->pb);
443 const int64_t fsize= avio_size(s->pb);
444 avio_seek(s->pb, fsize-4, SEEK_SET);
445 size= avio_rb32(s->pb);
446 avio_seek(s->pb, fsize-3-size, SEEK_SET);
447 if(size == avio_rb24(s->pb) + 11){
448 uint32_t ts = avio_rb24(s->pb);
449 ts |= avio_r8(s->pb) << 24;
450 s->duration = ts * (int64_t)AV_TIME_BASE / 1000;
452 avio_seek(s->pb, pos, SEEK_SET);
456 if(!st->codec->channels || !st->codec->sample_rate || !st->codec->bits_per_coded_sample) {
457 st->codec->channels = (flags & FLV_AUDIO_CHANNEL_MASK) == FLV_STEREO ? 2 : 1;
458 st->codec->sample_rate = (44100 << ((flags & FLV_AUDIO_SAMPLERATE_MASK) >> FLV_AUDIO_SAMPLERATE_OFFSET) >> 3);
459 st->codec->bits_per_coded_sample = (flags & FLV_AUDIO_SAMPLESIZE_MASK) ? 16 : 8;
461 if(!st->codec->codec_id){
462 flv_set_audio_codec(s, st, flags & FLV_AUDIO_CODECID_MASK);
465 size -= flv_set_video_codec(s, st, flags & FLV_VIDEO_CODECID_MASK);
468 if (st->codec->codec_id == CODEC_ID_AAC ||
469 st->codec->codec_id == CODEC_ID_H264) {
470 int type = avio_r8(s->pb);
472 if (st->codec->codec_id == CODEC_ID_H264) {
473 int32_t cts = (avio_rb24(s->pb)+0xff800000)^0xff800000; // sign extension
475 if (cts < 0) { // dts are wrong
477 av_log(s, AV_LOG_WARNING, "negative cts, previous timestamps might be wrong\n");
480 dts = AV_NOPTS_VALUE;
483 if ((ret = flv_get_extradata(s, st, size)) < 0)
485 if (st->codec->codec_id == CODEC_ID_AAC) {
486 MPEG4AudioConfig cfg;
487 ff_mpeg4audio_get_config(&cfg, st->codec->extradata,
488 st->codec->extradata_size);
489 st->codec->channels = cfg.channels;
490 if (cfg.ext_sample_rate)
491 st->codec->sample_rate = cfg.ext_sample_rate;
493 st->codec->sample_rate = cfg.sample_rate;
494 av_dlog(s, "mp4a config channels %d sample rate %d\n",
495 st->codec->channels, st->codec->sample_rate);
498 ret = AVERROR(EAGAIN);
503 /* skip empty data packets */
505 ret = AVERROR(EAGAIN);
509 ret= av_get_packet(s->pb, pkt, size);
513 /* note: we need to modify the packet size here to handle the last
517 pkt->pts = pts == AV_NOPTS_VALUE ? dts : pts;
518 pkt->stream_index = st->index;
520 if (is_audio || ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY))
521 pkt->flags |= AV_PKT_FLAG_KEY;
528 static int flv_read_seek(AVFormatContext *s, int stream_index,
529 int64_t ts, int flags)
531 return avio_seek_time(s->pb, stream_index, ts, flags);
534 #if 0 /* don't know enough to implement this */
535 static int flv_read_seek2(AVFormatContext *s, int stream_index,
536 int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
538 int ret = AVERROR(ENOSYS);
540 if (ts - min_ts > (uint64_t)(max_ts - ts)) flags |= AVSEEK_FLAG_BACKWARD;
542 if (!s->pb->seekable) {
543 if (stream_index < 0) {
544 stream_index = av_find_default_stream_index(s);
545 if (stream_index < 0)
548 /* timestamp for default must be expressed in AV_TIME_BASE units */
549 ts = av_rescale_rnd(ts, 1000, AV_TIME_BASE,
550 flags & AVSEEK_FLAG_BACKWARD ? AV_ROUND_DOWN : AV_ROUND_UP);
552 ret = avio_seek_time(s->pb, stream_index, ts, flags);
555 if (ret == AVERROR(ENOSYS))
556 ret = av_seek_frame(s, stream_index, ts, flags);
561 AVInputFormat ff_flv_demuxer = {
563 NULL_IF_CONFIG_SMALL("FLV format"),
568 .read_seek = flv_read_seek,
570 .read_seek2 = flv_read_seek2,
573 .value = CODEC_ID_FLV1,