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"
34 int wrong_dts; ///< wrong dts due to negative cts
37 static int flv_probe(AVProbeData *p)
42 if (d[0] == 'F' && d[1] == 'L' && d[2] == 'V' && d[3] < 5 && d[5]==0 && AV_RB32(d+5)>8) {
43 return AVPROBE_SCORE_MAX;
48 static void flv_set_audio_codec(AVFormatContext *s, AVStream *astream, int flv_codecid) {
49 AVCodecContext *acodec = astream->codec;
51 //no distinction between S16 and S8 PCM codec flags
53 acodec->codec_id = acodec->bits_per_coded_sample == 8 ? CODEC_ID_PCM_U8 :
60 case FLV_CODECID_PCM_LE:
61 acodec->codec_id = acodec->bits_per_coded_sample == 8 ? CODEC_ID_PCM_U8 : CODEC_ID_PCM_S16LE; break;
62 case FLV_CODECID_AAC : acodec->codec_id = CODEC_ID_AAC; break;
63 case FLV_CODECID_ADPCM: acodec->codec_id = CODEC_ID_ADPCM_SWF; break;
64 case FLV_CODECID_SPEEX:
65 acodec->codec_id = CODEC_ID_SPEEX;
66 acodec->sample_rate = 16000;
68 case FLV_CODECID_MP3 : acodec->codec_id = CODEC_ID_MP3 ; astream->need_parsing = AVSTREAM_PARSE_FULL; break;
69 case FLV_CODECID_NELLYMOSER_8KHZ_MONO:
70 acodec->sample_rate = 8000; //in case metadata does not otherwise declare samplerate
71 case FLV_CODECID_NELLYMOSER:
72 acodec->codec_id = CODEC_ID_NELLYMOSER;
75 av_log(s, AV_LOG_INFO, "Unsupported audio codec (%x)\n", flv_codecid >> FLV_AUDIO_CODECID_OFFSET);
76 acodec->codec_tag = flv_codecid >> FLV_AUDIO_CODECID_OFFSET;
80 static int flv_set_video_codec(AVFormatContext *s, AVStream *vstream, int flv_codecid) {
81 AVCodecContext *vcodec = vstream->codec;
83 case FLV_CODECID_H263 : vcodec->codec_id = CODEC_ID_FLV1 ; break;
84 case FLV_CODECID_SCREEN: vcodec->codec_id = CODEC_ID_FLASHSV; break;
85 case FLV_CODECID_SCREEN2: vcodec->codec_id = CODEC_ID_FLASHSV2; break;
86 case FLV_CODECID_VP6 : vcodec->codec_id = CODEC_ID_VP6F ;
87 case FLV_CODECID_VP6A :
88 if(flv_codecid == FLV_CODECID_VP6A)
89 vcodec->codec_id = CODEC_ID_VP6A;
90 if(vcodec->extradata_size != 1) {
91 vcodec->extradata_size = 1;
92 vcodec->extradata = av_malloc(1);
94 vcodec->extradata[0] = get_byte(s->pb);
95 return 1; // 1 byte body size adjustment for flv_read_packet()
96 case FLV_CODECID_H264:
97 vcodec->codec_id = CODEC_ID_H264;
98 return 3; // not 4, reading packet type will consume one byte
100 av_log(s, AV_LOG_INFO, "Unsupported video codec (%x)\n", flv_codecid);
101 vcodec->codec_tag = flv_codecid;
107 static int amf_get_string(ByteIOContext *ioc, char **buf)
109 uint16_t len = get_be16(ioc);
111 *buf = av_malloc(len+1);
113 return AVERROR_NOMEM;
115 get_buffer(ioc, *buf, len);
121 static int amf_parse_object(AVFormatContext *s, AVStream *astream, AVStream *vstream, const char *key, int64_t max_pos, int depth) {
122 AVCodecContext *acodec, *vcodec;
124 AMFDataType amf_type;
131 amf_type = get_byte(ioc);
134 case AMF_DATA_TYPE_NUMBER:
135 num_val = av_int2dbl(get_be64(ioc)); break;
136 case AMF_DATA_TYPE_BOOL:
137 num_val = get_byte(ioc); break;
138 case AMF_DATA_TYPE_STRING:
139 if(amf_get_string(ioc, &str) < 0)
142 case AMF_DATA_TYPE_OBJECT: {
145 while(url_ftell(ioc) < max_pos - 2 && (keylen = get_be16(ioc))) {
146 url_fskip(ioc, keylen); //skip key string
147 if(amf_parse_object(s, NULL, NULL, NULL, max_pos, depth + 1) < 0)
148 return -1; //if we couldn't skip, bomb out.
150 if(get_byte(ioc) != AMF_END_OF_OBJECT)
154 case AMF_DATA_TYPE_NULL:
155 case AMF_DATA_TYPE_UNDEFINED:
156 case AMF_DATA_TYPE_UNSUPPORTED:
157 break; //these take up no additional space
158 case AMF_DATA_TYPE_MIXEDARRAY:
159 url_fskip(ioc, 4); //skip 32-bit max array index
160 while(url_ftell(ioc) < max_pos - 2 && amf_get_string(ioc, &str) > 0) {
161 //this is the only case in which we would want a nested parse to not skip over the object
162 if(amf_parse_object(s, astream, vstream, str, max_pos, depth + 1) < 0)
166 if(get_byte(ioc) != AMF_END_OF_OBJECT)
169 case AMF_DATA_TYPE_ARRAY: {
170 unsigned int arraylen, i;
172 arraylen = get_be32(ioc);
173 for(i = 0; i < arraylen && url_ftell(ioc) < max_pos - 1; i++) {
174 if(amf_parse_object(s, NULL, NULL, NULL, max_pos, depth + 1) < 0)
175 return -1; //if we couldn't skip, bomb out.
179 case AMF_DATA_TYPE_DATE:
180 url_fskip(ioc, 8 + 2); //timestamp (double) and UTC offset (int16)
182 default: //unsupported type, we couldn't skip
186 if(depth == 1 && key) { //only look for metadata values when we are not nested and key != NULL
187 acodec = astream ? astream->codec : NULL;
188 vcodec = vstream ? vstream->codec : NULL;
190 if(amf_type == AMF_DATA_TYPE_BOOL) {
191 av_metadata_set2(&s->metadata, key, av_d2str(num_val), AV_METADATA_DONT_STRDUP_VAL);
192 } else if(amf_type == AMF_DATA_TYPE_NUMBER) {
193 av_metadata_set2(&s->metadata, key, av_d2str(num_val), AV_METADATA_DONT_STRDUP_VAL);
194 if(!strcmp(key, "duration")) s->duration = num_val * AV_TIME_BASE;
195 else if(!strcmp(key, "videodatarate") && vcodec && 0 <= (int)(num_val * 1024.0))
196 vcodec->bit_rate = num_val * 1024.0;
197 } else if (amf_type == AMF_DATA_TYPE_STRING)
198 av_metadata_set2(&s->metadata, key, str,
199 AV_METADATA_DONT_STRDUP_VAL);
205 static int flv_read_metabody(AVFormatContext *s, int64_t next_pos) {
207 AVStream *stream, *astream, *vstream;
210 char *buf = NULL; //only needs to hold the string "onMetaData". Anything longer is something we don't want.
216 //first object needs to be "onMetaData" string
217 type = get_byte(ioc);
218 if (type != AMF_DATA_TYPE_STRING ||
219 amf_get_string(ioc, &buf) < 0 || strcmp(buf, "onMetaData")) {
224 //find the streams now so that amf_parse_object doesn't need to do the lookup every time it is called.
225 for(i = 0; i < s->nb_streams; i++) {
226 stream = s->streams[i];
227 if (stream->codec->codec_type == CODEC_TYPE_AUDIO) astream = stream;
228 else if(stream->codec->codec_type == CODEC_TYPE_VIDEO) vstream = stream;
231 //parse the second object (we want a mixed array)
232 if(amf_parse_object(s, astream, vstream, buf, next_pos, 0) < 0)
239 static AVStream *create_stream(AVFormatContext *s, int is_audio){
240 AVStream *st = av_new_stream(s, is_audio);
243 st->codec->codec_type = is_audio ? CODEC_TYPE_AUDIO : CODEC_TYPE_VIDEO;
244 av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
248 static int flv_read_header(AVFormatContext *s,
249 AVFormatParameters *ap)
254 flags = get_byte(s->pb);
255 /* old flvtool cleared this field */
256 /* FIXME: better fix needed */
258 flags = FLV_HEADER_FLAG_HASVIDEO | FLV_HEADER_FLAG_HASAUDIO;
259 av_log(s, AV_LOG_WARNING, "Broken FLV file, which says no streams present, this might fail\n");
262 if((flags & (FLV_HEADER_FLAG_HASVIDEO|FLV_HEADER_FLAG_HASAUDIO))
263 != (FLV_HEADER_FLAG_HASVIDEO|FLV_HEADER_FLAG_HASAUDIO))
264 s->ctx_flags |= AVFMTCTX_NOHEADER;
266 if(flags & FLV_HEADER_FLAG_HASVIDEO){
267 if(!create_stream(s, 0))
268 return AVERROR(ENOMEM);
270 if(flags & FLV_HEADER_FLAG_HASAUDIO){
271 if(!create_stream(s, 1))
272 return AVERROR(ENOMEM);
275 offset = get_be32(s->pb);
276 url_fseek(s->pb, offset, SEEK_SET);
283 static int flv_get_extradata(AVFormatContext *s, AVStream *st, int size)
285 av_free(st->codec->extradata);
286 st->codec->extradata = av_mallocz(size + FF_INPUT_BUFFER_PADDING_SIZE);
287 if (!st->codec->extradata)
288 return AVERROR(ENOMEM);
289 st->codec->extradata_size = size;
290 get_buffer(s->pb, st->codec->extradata, st->codec->extradata_size);
294 static int flv_read_packet(AVFormatContext *s, AVPacket *pkt)
296 FLVContext *flv = s->priv_data;
297 int ret, i, type, size, flags, is_audio;
299 int64_t dts, pts = AV_NOPTS_VALUE;
303 pos = url_ftell(s->pb);
304 url_fskip(s->pb, 4); /* size of previous packet */
305 type = get_byte(s->pb);
306 size = get_be24(s->pb);
307 dts = get_be24(s->pb);
308 dts |= get_byte(s->pb) << 24;
309 // av_log(s, AV_LOG_DEBUG, "type:%d, size:%d, dts:%d\n", type, size, dts);
312 url_fskip(s->pb, 3); /* stream id, always 0 */
318 next= size + url_ftell(s->pb);
320 if (type == FLV_TAG_TYPE_AUDIO) {
322 flags = get_byte(s->pb);
324 } else if (type == FLV_TAG_TYPE_VIDEO) {
326 flags = get_byte(s->pb);
328 if ((flags & 0xf0) == 0x50) /* video info / command frame */
331 if (type == FLV_TAG_TYPE_META && size > 13+1+4)
332 flv_read_metabody(s, next);
333 else /* skip packet */
334 av_log(s, AV_LOG_DEBUG, "skipping flv packet: type %d, size %d, flags %d\n", type, size, flags);
336 url_fseek(s->pb, next, SEEK_SET);
340 /* skip empty data packets */
344 /* now find stream */
345 for(i=0;i<s->nb_streams;i++) {
347 if (st->id == is_audio)
350 if(i == s->nb_streams){
351 av_log(s, AV_LOG_ERROR, "invalid stream\n");
352 st= create_stream(s, is_audio);
353 s->ctx_flags &= ~AVFMTCTX_NOHEADER;
355 // av_log(s, AV_LOG_DEBUG, "%d %X %d \n", is_audio, flags, st->discard);
356 if( (st->discard >= AVDISCARD_NONKEY && !((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY || is_audio))
357 ||(st->discard >= AVDISCARD_BIDIR && ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_DISP_INTER && !is_audio))
358 || st->discard >= AVDISCARD_ALL
360 url_fseek(s->pb, next, SEEK_SET);
363 if ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY)
364 av_add_index_entry(st, pos, dts, size, 0, AVINDEX_KEYFRAME);
368 // if not streamed and no duration from metadata then seek to end to find the duration from the timestamps
369 if(!url_is_streamed(s->pb) && s->duration==AV_NOPTS_VALUE){
371 const int64_t pos= url_ftell(s->pb);
372 const int64_t fsize= url_fsize(s->pb);
373 url_fseek(s->pb, fsize-4, SEEK_SET);
374 size= get_be32(s->pb);
375 url_fseek(s->pb, fsize-3-size, SEEK_SET);
376 if(size == get_be24(s->pb) + 11){
377 uint32_t ts = get_be24(s->pb);
378 ts |= get_byte(s->pb) << 24;
379 s->duration = ts * (int64_t)AV_TIME_BASE / 1000;
381 url_fseek(s->pb, pos, SEEK_SET);
385 if(!st->codec->channels || !st->codec->sample_rate || !st->codec->bits_per_coded_sample) {
386 st->codec->channels = (flags & FLV_AUDIO_CHANNEL_MASK) == FLV_STEREO ? 2 : 1;
387 st->codec->sample_rate = (44100 << ((flags & FLV_AUDIO_SAMPLERATE_MASK) >> FLV_AUDIO_SAMPLERATE_OFFSET) >> 3);
388 st->codec->bits_per_coded_sample = (flags & FLV_AUDIO_SAMPLESIZE_MASK) ? 16 : 8;
390 if(!st->codec->codec_id){
391 flv_set_audio_codec(s, st, flags & FLV_AUDIO_CODECID_MASK);
394 size -= flv_set_video_codec(s, st, flags & FLV_VIDEO_CODECID_MASK);
397 if (st->codec->codec_id == CODEC_ID_AAC ||
398 st->codec->codec_id == CODEC_ID_H264) {
399 int type = get_byte(s->pb);
401 if (st->codec->codec_id == CODEC_ID_H264) {
402 int32_t cts = (get_be24(s->pb)+0xff800000)^0xff800000; // sign extension
404 if (cts < 0) { // dts are wrong
406 av_log(s, AV_LOG_WARNING, "negative cts, previous timestamps might be wrong\n");
409 dts = AV_NOPTS_VALUE;
412 if ((ret = flv_get_extradata(s, st, size)) < 0)
414 if (st->codec->codec_id == CODEC_ID_AAC) {
415 MPEG4AudioConfig cfg;
416 ff_mpeg4audio_get_config(&cfg, st->codec->extradata,
417 st->codec->extradata_size);
418 st->codec->channels = cfg.channels;
419 st->codec->sample_rate = cfg.sample_rate;
420 dprintf(s, "mp4a config channels %d sample rate %d\n",
421 st->codec->channels, st->codec->sample_rate);
424 return AVERROR(EAGAIN);
428 /* skip empty data packets */
430 return AVERROR(EAGAIN);
432 ret= av_get_packet(s->pb, pkt, size);
436 /* note: we need to modify the packet size here to handle the last
440 pkt->pts = pts == AV_NOPTS_VALUE ? dts : pts;
441 pkt->stream_index = st->index;
443 if (is_audio || ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY))
444 pkt->flags |= PKT_FLAG_KEY;
449 AVInputFormat flv_demuxer = {
451 NULL_IF_CONFIG_SMALL("FLV format"),
457 .value = CODEC_ID_FLV1,