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
29 static int flv_probe(AVProbeData *p)
34 if (d[0] == 'F' && d[1] == 'L' && d[2] == 'V' && d[3] < 5 && d[5]==0) {
35 return AVPROBE_SCORE_MAX;
40 static void flv_set_audio_codec(AVFormatContext *s, AVStream *astream, int flv_codecid) {
41 AVCodecContext *acodec = astream->codec;
43 //no distinction between S16 and S8 PCM codec flags
45 acodec->codec_id = acodec->bits_per_sample == 8 ? CODEC_ID_PCM_S8 :
46 #ifdef WORDS_BIGENDIAN
52 case FLV_CODECID_PCM_LE:
53 acodec->codec_id = acodec->bits_per_sample == 8 ? CODEC_ID_PCM_S8 : CODEC_ID_PCM_S16LE; break;
54 case FLV_CODECID_AAC : acodec->codec_id = CODEC_ID_AAC; break;
55 case FLV_CODECID_ADPCM: acodec->codec_id = CODEC_ID_ADPCM_SWF; break;
56 case FLV_CODECID_MP3 : acodec->codec_id = CODEC_ID_MP3 ; astream->need_parsing = AVSTREAM_PARSE_FULL; break;
57 case FLV_CODECID_NELLYMOSER_8HZ_MONO:
58 acodec->sample_rate = 8000; //in case metadata does not otherwise declare samplerate
59 case FLV_CODECID_NELLYMOSER:
60 acodec->codec_id = CODEC_ID_NELLYMOSER;
63 av_log(s, AV_LOG_INFO, "Unsupported audio codec (%x)\n", flv_codecid >> FLV_AUDIO_CODECID_OFFSET);
64 acodec->codec_tag = flv_codecid >> FLV_AUDIO_CODECID_OFFSET;
68 static int flv_set_video_codec(AVFormatContext *s, AVStream *vstream, int flv_codecid) {
69 AVCodecContext *vcodec = vstream->codec;
71 case FLV_CODECID_H263 : vcodec->codec_id = CODEC_ID_FLV1 ; break;
72 case FLV_CODECID_SCREEN: vcodec->codec_id = CODEC_ID_FLASHSV; break;
73 case FLV_CODECID_VP6 : vcodec->codec_id = CODEC_ID_VP6F ;
74 case FLV_CODECID_VP6A :
75 if(flv_codecid == FLV_CODECID_VP6A)
76 vcodec->codec_id = CODEC_ID_VP6A;
77 if(vcodec->extradata_size != 1) {
78 vcodec->extradata_size = 1;
79 vcodec->extradata = av_malloc(1);
81 vcodec->extradata[0] = get_byte(s->pb);
82 return 1; // 1 byte body size adjustment for flv_read_packet()
83 case FLV_CODECID_H264:
84 vcodec->codec_id = CODEC_ID_H264;
85 return 3; // not 4, reading packet type will consume one byte
87 av_log(s, AV_LOG_INFO, "Unsupported video codec (%x)\n", flv_codecid);
88 vcodec->codec_tag = flv_codecid;
94 static int amf_get_string(ByteIOContext *ioc, char *buffer, int buffsize) {
95 int length = get_be16(ioc);
96 if(length >= buffsize) {
97 url_fskip(ioc, length);
101 get_buffer(ioc, buffer, length);
103 buffer[length] = '\0';
108 static int amf_parse_object(AVFormatContext *s, AVStream *astream, AVStream *vstream, const char *key, unsigned int max_pos, int depth) {
109 AVCodecContext *acodec, *vcodec;
111 AMFDataType amf_type;
118 amf_type = get_byte(ioc);
121 case AMF_DATA_TYPE_NUMBER:
122 num_val = av_int2dbl(get_be64(ioc)); break;
123 case AMF_DATA_TYPE_BOOL:
124 num_val = get_byte(ioc); break;
125 case AMF_DATA_TYPE_STRING:
126 if(amf_get_string(ioc, str_val, sizeof(str_val)) < 0)
129 case AMF_DATA_TYPE_OBJECT: {
132 while(url_ftell(ioc) < max_pos - 2 && (keylen = get_be16(ioc))) {
133 url_fskip(ioc, keylen); //skip key string
134 if(amf_parse_object(s, NULL, NULL, NULL, max_pos, depth + 1) < 0)
135 return -1; //if we couldn't skip, bomb out.
137 if(get_byte(ioc) != AMF_END_OF_OBJECT)
141 case AMF_DATA_TYPE_NULL:
142 case AMF_DATA_TYPE_UNDEFINED:
143 case AMF_DATA_TYPE_UNSUPPORTED:
144 break; //these take up no additional space
145 case AMF_DATA_TYPE_MIXEDARRAY:
146 url_fskip(ioc, 4); //skip 32-bit max array index
147 while(url_ftell(ioc) < max_pos - 2 && amf_get_string(ioc, str_val, sizeof(str_val)) > 0) {
148 //this is the only case in which we would want a nested parse to not skip over the object
149 if(amf_parse_object(s, astream, vstream, str_val, max_pos, depth + 1) < 0)
152 if(get_byte(ioc) != AMF_END_OF_OBJECT)
155 case AMF_DATA_TYPE_ARRAY: {
156 unsigned int arraylen, i;
158 arraylen = get_be32(ioc);
159 for(i = 0; i < arraylen && url_ftell(ioc) < max_pos - 1; i++) {
160 if(amf_parse_object(s, NULL, NULL, NULL, max_pos, depth + 1) < 0)
161 return -1; //if we couldn't skip, bomb out.
165 case AMF_DATA_TYPE_DATE:
166 url_fskip(ioc, 8 + 2); //timestamp (double) and UTC offset (int16)
168 default: //unsupported type, we couldn't skip
172 if(depth == 1 && key) { //only look for metadata values when we are not nested and key != NULL
173 acodec = astream ? astream->codec : NULL;
174 vcodec = vstream ? vstream->codec : NULL;
176 if(amf_type == AMF_DATA_TYPE_BOOL) {
177 if(!strcmp(key, "stereo") && acodec) acodec->channels = num_val > 0 ? 2 : 1;
178 } else if(amf_type == AMF_DATA_TYPE_NUMBER) {
179 if(!strcmp(key, "duration")) s->duration = num_val * AV_TIME_BASE;
180 // else if(!strcmp(key, "width") && vcodec && num_val > 0) vcodec->width = num_val;
181 // else if(!strcmp(key, "height") && vcodec && num_val > 0) vcodec->height = num_val;
182 else if(!strcmp(key, "audiocodecid") && acodec && 0 <= (int)num_val)
183 flv_set_audio_codec(s, astream, (int)num_val << FLV_AUDIO_CODECID_OFFSET);
184 else if(!strcmp(key, "videocodecid") && vcodec && 0 <= (int)num_val)
185 flv_set_video_codec(s, vstream, (int)num_val);
186 else if(!strcmp(key, "audiosamplesize") && acodec && 0 < (int)num_val) {
187 acodec->bits_per_sample = num_val;
188 //we may have to rewrite a previously read codecid because FLV only marks PCM endianness.
189 if(num_val == 8 && (acodec->codec_id == CODEC_ID_PCM_S16BE || acodec->codec_id == CODEC_ID_PCM_S16LE))
190 acodec->codec_id = CODEC_ID_PCM_S8;
192 else if(!strcmp(key, "audiosamplerate") && acodec && num_val >= 0) {
193 //some tools, like FLVTool2, write consistently approximate metadata sample rates
194 if (!acodec->sample_rate) {
195 switch((int)num_val) {
196 case 44000: acodec->sample_rate = 44100 ; break;
197 case 22000: acodec->sample_rate = 22050 ; break;
198 case 11000: acodec->sample_rate = 11025 ; break;
199 case 5000 : acodec->sample_rate = 5512 ; break;
200 default : acodec->sample_rate = num_val;
210 static int flv_read_metabody(AVFormatContext *s, unsigned int next_pos) {
212 AVStream *stream, *astream, *vstream;
215 char buffer[11]; //only needs to hold the string "onMetaData". Anything longer is something we don't want.
222 //first object needs to be "onMetaData" string
223 type = get_byte(ioc);
224 if(type != AMF_DATA_TYPE_STRING || amf_get_string(ioc, buffer, sizeof(buffer)) < 0 || strcmp(buffer, "onMetaData"))
227 //find the streams now so that amf_parse_object doesn't need to do the lookup every time it is called.
228 for(i = 0; i < s->nb_streams; i++) {
229 stream = s->streams[i];
230 if (stream->codec->codec_type == CODEC_TYPE_AUDIO) astream = stream;
231 else if(stream->codec->codec_type == CODEC_TYPE_VIDEO) vstream = stream;
234 //parse the second object (we want a mixed array)
235 if(amf_parse_object(s, astream, vstream, buffer, next_pos, 0) < 0)
241 static AVStream *create_stream(AVFormatContext *s, int is_audio){
242 AVStream *st = av_new_stream(s, is_audio);
245 st->codec->codec_type = is_audio ? CODEC_TYPE_AUDIO : CODEC_TYPE_VIDEO;
246 av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
250 static int flv_read_header(AVFormatContext *s,
251 AVFormatParameters *ap)
256 flags = get_byte(s->pb);
257 /* old flvtool cleared this field */
258 /* FIXME: better fix needed */
260 flags = FLV_HEADER_FLAG_HASVIDEO | FLV_HEADER_FLAG_HASAUDIO;
261 av_log(s, AV_LOG_WARNING, "Broken FLV file, which says no streams present, this might fail\n");
264 if((flags & (FLV_HEADER_FLAG_HASVIDEO|FLV_HEADER_FLAG_HASAUDIO))
265 != (FLV_HEADER_FLAG_HASVIDEO|FLV_HEADER_FLAG_HASAUDIO))
266 s->ctx_flags |= AVFMTCTX_NOHEADER;
268 if(flags & FLV_HEADER_FLAG_HASVIDEO){
269 if(!create_stream(s, 0))
270 return AVERROR(ENOMEM);
272 if(flags & FLV_HEADER_FLAG_HASAUDIO){
273 if(!create_stream(s, 1))
274 return AVERROR(ENOMEM);
277 offset = get_be32(s->pb);
278 url_fseek(s->pb, offset, SEEK_SET);
285 static int flv_get_extradata(AVFormatContext *s, AVStream *st, int size)
287 av_free(st->codec->extradata);
288 st->codec->extradata = av_mallocz(size + FF_INPUT_BUFFER_PADDING_SIZE);
289 if (!st->codec->extradata)
290 return AVERROR(ENOMEM);
291 st->codec->extradata_size = size;
292 get_buffer(s->pb, st->codec->extradata, st->codec->extradata_size);
296 static int flv_read_packet(AVFormatContext *s, AVPacket *pkt)
298 int ret, i, type, size, flags, is_audio, next, pos;
304 pos = url_ftell(s->pb);
305 url_fskip(s->pb, 4); /* size of previous packet */
306 type = get_byte(s->pb);
307 size = get_be24(s->pb);
308 dts = get_be24(s->pb);
309 dts |= get_byte(s->pb) << 24;
310 // av_log(s, AV_LOG_DEBUG, "type:%d, size:%d, dts:%d\n", type, size, dts);
313 url_fskip(s->pb, 3); /* stream id, always 0 */
319 next= size + url_ftell(s->pb);
321 if (type == FLV_TAG_TYPE_AUDIO) {
323 flags = get_byte(s->pb);
324 } else if (type == FLV_TAG_TYPE_VIDEO) {
326 flags = get_byte(s->pb);
328 if (type == FLV_TAG_TYPE_META && size > 13+1+4)
329 flv_read_metabody(s, next);
330 else /* skip packet */
331 av_log(s, AV_LOG_ERROR, "skipping flv packet: type %d, size %d, flags %d\n", type, size, flags);
332 url_fseek(s->pb, next, SEEK_SET);
336 /* now find stream */
337 for(i=0;i<s->nb_streams;i++) {
339 if (st->id == is_audio)
342 if(i == s->nb_streams){
343 av_log(NULL, AV_LOG_ERROR, "invalid stream\n");
344 st= create_stream(s, is_audio);
345 s->ctx_flags &= ~AVFMTCTX_NOHEADER;
347 // av_log(NULL, AV_LOG_DEBUG, "%d %X %d \n", is_audio, flags, st->discard);
348 if( (st->discard >= AVDISCARD_NONKEY && !((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY || is_audio))
349 ||(st->discard >= AVDISCARD_BIDIR && ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_DISP_INTER && !is_audio))
350 || st->discard >= AVDISCARD_ALL
352 url_fseek(s->pb, next, SEEK_SET);
355 if ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY)
356 av_add_index_entry(st, pos, dts, size, 0, AVINDEX_KEYFRAME);
360 // if not streamed and no duration from metadata then seek to end to find the duration from the timestamps
361 if(!url_is_streamed(s->pb) && s->duration==AV_NOPTS_VALUE){
363 const int pos= url_ftell(s->pb);
364 const int fsize= url_fsize(s->pb);
365 url_fseek(s->pb, fsize-4, SEEK_SET);
366 size= get_be32(s->pb);
367 url_fseek(s->pb, fsize-3-size, SEEK_SET);
368 if(size == get_be24(s->pb) + 11){
369 s->duration= get_be24(s->pb) * (int64_t)AV_TIME_BASE / 1000;
371 url_fseek(s->pb, pos, SEEK_SET);
375 if(!st->codec->sample_rate || !st->codec->bits_per_sample || (!st->codec->codec_id && !st->codec->codec_tag)) {
376 st->codec->channels = (flags & FLV_AUDIO_CHANNEL_MASK) == FLV_STEREO ? 2 : 1;
377 if((flags & FLV_AUDIO_CODECID_MASK) == FLV_CODECID_NELLYMOSER_8HZ_MONO)
378 st->codec->sample_rate= 8000;
380 st->codec->sample_rate = (44100 << ((flags & FLV_AUDIO_SAMPLERATE_MASK) >> FLV_AUDIO_SAMPLERATE_OFFSET) >> 3);
381 st->codec->bits_per_sample = (flags & FLV_AUDIO_SAMPLESIZE_MASK) ? 16 : 8;
382 flv_set_audio_codec(s, st, flags & FLV_AUDIO_CODECID_MASK);
385 size -= flv_set_video_codec(s, st, flags & FLV_VIDEO_CODECID_MASK);
388 if (st->codec->codec_id == CODEC_ID_AAC ||
389 st->codec->codec_id == CODEC_ID_H264) {
390 int type = get_byte(s->pb);
392 if (st->codec->codec_id == CODEC_ID_H264) {
393 // cts offset ignored because it might to be signed
394 // and would cause pts < dts
398 if ((ret = flv_get_extradata(s, st, size - 1)) < 0)
404 ret= av_get_packet(s->pb, pkt, size - 1);
408 /* note: we need to modify the packet size here to handle the last
412 pkt->stream_index = st->index;
414 if (is_audio || ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY))
415 pkt->flags |= PKT_FLAG_KEY;
420 AVInputFormat flv_demuxer = {
428 .value = CODEC_ID_FLV1,