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
44 case FLV_CODECID_PCM_BE:
45 acodec->codec_id = acodec->bits_per_sample == 8 ? CODEC_ID_PCM_S8 : CODEC_ID_PCM_S16BE; break;
46 case FLV_CODECID_PCM_LE:
47 acodec->codec_id = acodec->bits_per_sample == 8 ? CODEC_ID_PCM_S8 : CODEC_ID_PCM_S16LE; break;
48 case FLV_CODECID_ADPCM: acodec->codec_id = CODEC_ID_ADPCM_SWF; break;
49 case FLV_CODECID_MP3 : acodec->codec_id = CODEC_ID_MP3 ; astream->need_parsing = AVSTREAM_PARSE_FULL; break;
50 case FLV_CODECID_NELLYMOSER_8HZ_MONO:
51 acodec->sample_rate = 8000; //in case metadata does not otherwise declare samplerate
52 case FLV_CODECID_NELLYMOSER:
53 acodec->codec_id = CODEC_ID_NELLYMOSER;
56 av_log(s, AV_LOG_INFO, "Unsupported audio codec (%x)\n", flv_codecid >> FLV_AUDIO_CODECID_OFFSET);
57 acodec->codec_tag = flv_codecid >> FLV_AUDIO_CODECID_OFFSET;
61 static int flv_set_video_codec(AVFormatContext *s, AVStream *vstream, int flv_codecid) {
62 AVCodecContext *vcodec = vstream->codec;
64 case FLV_CODECID_H263 : vcodec->codec_id = CODEC_ID_FLV1 ; break;
65 case FLV_CODECID_SCREEN: vcodec->codec_id = CODEC_ID_FLASHSV; break;
66 case FLV_CODECID_VP6 : vcodec->codec_id = CODEC_ID_VP6F ;
67 case FLV_CODECID_VP6A :
68 if(flv_codecid == FLV_CODECID_VP6A)
69 vcodec->codec_id = CODEC_ID_VP6A;
70 if(vcodec->extradata_size != 1) {
71 vcodec->extradata_size = 1;
72 vcodec->extradata = av_malloc(1);
74 vcodec->extradata[0] = get_byte(&s->pb);
75 return 1; // 1 byte body size adjustment for flv_read_packet()
77 av_log(s, AV_LOG_INFO, "Unsupported video codec (%x)\n", flv_codecid);
78 vcodec->codec_tag = flv_codecid;
84 static int amf_get_string(ByteIOContext *ioc, char *buffer, int buffsize) {
85 int length = get_be16(ioc);
86 if(length >= buffsize) {
87 url_fskip(ioc, length);
91 get_buffer(ioc, buffer, length);
93 buffer[length] = '\0';
98 static int amf_parse_object(AVFormatContext *s, AVStream *astream, AVStream *vstream, const char *key, unsigned int max_pos, int depth) {
99 AVCodecContext *acodec, *vcodec;
101 AMFDataType amf_type;
108 amf_type = get_byte(ioc);
111 case AMF_DATA_TYPE_NUMBER:
112 num_val = av_int2dbl(get_be64(ioc)); break;
113 case AMF_DATA_TYPE_BOOL:
114 num_val = get_byte(ioc); break;
115 case AMF_DATA_TYPE_STRING:
116 if(amf_get_string(ioc, str_val, sizeof(str_val)) < 0)
119 case AMF_DATA_TYPE_OBJECT: {
122 while(url_ftell(ioc) < max_pos - 2 && (keylen = get_be16(ioc))) {
123 url_fskip(ioc, keylen); //skip key string
124 if(amf_parse_object(s, NULL, NULL, NULL, max_pos, depth + 1) < 0)
125 return -1; //if we couldn't skip, bomb out.
127 if(get_byte(ioc) != AMF_END_OF_OBJECT)
131 case AMF_DATA_TYPE_NULL:
132 case AMF_DATA_TYPE_UNDEFINED:
133 case AMF_DATA_TYPE_UNSUPPORTED:
134 break; //these take up no additional space
135 case AMF_DATA_TYPE_MIXEDARRAY:
136 url_fskip(ioc, 4); //skip 32-bit max array index
137 while(url_ftell(ioc) < max_pos - 2 && amf_get_string(ioc, str_val, sizeof(str_val)) > 0) {
138 //this is the only case in which we would want a nested parse to not skip over the object
139 if(amf_parse_object(s, astream, vstream, str_val, max_pos, depth + 1) < 0)
142 if(get_byte(ioc) != AMF_END_OF_OBJECT)
145 case AMF_DATA_TYPE_ARRAY: {
146 unsigned int arraylen, i;
148 arraylen = get_be32(ioc);
149 for(i = 0; i < arraylen && url_ftell(ioc) < max_pos - 1; i++) {
150 if(amf_parse_object(s, NULL, NULL, NULL, max_pos, depth + 1) < 0)
151 return -1; //if we couldn't skip, bomb out.
155 case AMF_DATA_TYPE_DATE:
156 url_fskip(ioc, 8 + 2); //timestamp (double) and UTC offset (int16)
158 default: //unsupported type, we couldn't skip
162 if(depth == 1 && key) { //only look for metadata values when we are not nested and key != NULL
163 acodec = astream ? astream->codec : NULL;
164 vcodec = vstream ? vstream->codec : NULL;
166 if(amf_type == AMF_DATA_TYPE_BOOL) {
167 if(!strcmp(key, "stereo") && acodec) acodec->channels = num_val > 0 ? 2 : 1;
168 } else if(amf_type == AMF_DATA_TYPE_NUMBER) {
169 if(!strcmp(key, "duration")) s->duration = num_val * AV_TIME_BASE;
170 // else if(!strcmp(key, "width") && vcodec && num_val > 0) vcodec->width = num_val;
171 // else if(!strcmp(key, "height") && vcodec && num_val > 0) vcodec->height = num_val;
172 else if(!strcmp(key, "audiocodecid") && acodec) flv_set_audio_codec(s, astream, (int)num_val << FLV_AUDIO_CODECID_OFFSET);
173 else if(!strcmp(key, "videocodecid") && vcodec) flv_set_video_codec(s, vstream, (int)num_val);
174 else if(!strcmp(key, "audiosamplesize") && acodec && num_val >= 0) {
175 acodec->bits_per_sample = num_val;
176 //we may have to rewrite a previously read codecid because FLV only marks PCM endianness.
177 if(num_val == 8 && (acodec->codec_id == CODEC_ID_PCM_S16BE || acodec->codec_id == CODEC_ID_PCM_S16LE))
178 acodec->codec_id = CODEC_ID_PCM_S8;
180 else if(!strcmp(key, "audiosamplerate") && acodec && num_val >= 0) {
181 //some tools, like FLVTool2, write consistently approximate metadata sample rates
182 switch((int)num_val) {
183 case 44000: acodec->sample_rate = 44100 ; break;
184 case 22000: acodec->sample_rate = 22050 ; break;
185 case 11000: acodec->sample_rate = 11025 ; break;
186 case 5000 : acodec->sample_rate = 5512 ; break;
187 default : acodec->sample_rate = num_val;
196 static int flv_read_metabody(AVFormatContext *s, unsigned int next_pos) {
198 AVStream *stream, *astream, *vstream;
201 char buffer[11]; //only needs to hold the string "onMetaData". Anything longer is something we don't want.
208 //first object needs to be "onMetaData" string
209 type = get_byte(ioc);
210 if(type != AMF_DATA_TYPE_STRING || amf_get_string(ioc, buffer, sizeof(buffer)) < 0 || strcmp(buffer, "onMetaData"))
213 //find the streams now so that amf_parse_object doesn't need to do the lookup every time it is called.
214 for(i = 0; i < s->nb_streams; i++) {
215 stream = s->streams[i];
216 if (stream->codec->codec_type == CODEC_TYPE_AUDIO) astream = stream;
217 else if(stream->codec->codec_type == CODEC_TYPE_VIDEO) vstream = stream;
220 //parse the second object (we want a mixed array)
221 if(amf_parse_object(s, astream, vstream, buffer, next_pos, 0) < 0)
227 static AVStream *create_stream(AVFormatContext *s, int is_audio){
228 AVStream *st = av_new_stream(s, is_audio);
231 st->codec->codec_type = is_audio ? CODEC_TYPE_AUDIO : CODEC_TYPE_VIDEO;
232 av_set_pts_info(st, 24, 1, 1000); /* 24 bit pts in ms */
236 static int flv_read_header(AVFormatContext *s,
237 AVFormatParameters *ap)
241 url_fskip(&s->pb, 4);
242 flags = get_byte(&s->pb);
243 /* old flvtool cleared this field */
244 /* FIXME: better fix needed */
246 flags = FLV_HEADER_FLAG_HASVIDEO | FLV_HEADER_FLAG_HASAUDIO;
247 av_log(s, AV_LOG_WARNING, "Broken FLV file, which says no streams present, this might fail\n");
250 if(flags & FLV_HEADER_FLAG_HASVIDEO){
251 if(!create_stream(s, 0))
252 return AVERROR(ENOMEM);
254 if(flags & FLV_HEADER_FLAG_HASAUDIO){
255 if(!create_stream(s, 1))
256 return AVERROR(ENOMEM);
259 offset = get_be32(&s->pb);
260 url_fseek(&s->pb, offset, SEEK_SET);
267 static int flv_read_packet(AVFormatContext *s, AVPacket *pkt)
269 int ret, i, type, size, pts, flags, is_audio, next, pos;
273 pos = url_ftell(&s->pb);
274 url_fskip(&s->pb, 4); /* size of previous packet */
275 type = get_byte(&s->pb);
276 size = get_be24(&s->pb);
277 pts = get_be24(&s->pb);
278 // av_log(s, AV_LOG_DEBUG, "type:%d, size:%d, pts:%d\n", type, size, pts);
279 if (url_feof(&s->pb))
281 url_fskip(&s->pb, 4); /* reserved */
287 next= size + url_ftell(&s->pb);
289 if (type == FLV_TAG_TYPE_AUDIO) {
291 flags = get_byte(&s->pb);
292 } else if (type == FLV_TAG_TYPE_VIDEO) {
294 flags = get_byte(&s->pb);
296 if (type == FLV_TAG_TYPE_META && size > 13+1+4)
297 flv_read_metabody(s, next);
298 else /* skip packet */
299 av_log(s, AV_LOG_ERROR, "skipping flv packet: type %d, size %d, flags %d\n", type, size, flags);
300 url_fseek(&s->pb, next, SEEK_SET);
304 /* now find stream */
305 for(i=0;i<s->nb_streams;i++) {
307 if (st->id == is_audio)
310 if(i == s->nb_streams){
311 av_log(NULL, AV_LOG_ERROR, "invalid stream\n");
312 st= create_stream(s, is_audio);
314 // av_log(NULL, AV_LOG_DEBUG, "%d %X %d \n", is_audio, flags, st->discard);
315 if( (st->discard >= AVDISCARD_NONKEY && !((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY || is_audio))
316 ||(st->discard >= AVDISCARD_BIDIR && ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_DISP_INTER && !is_audio))
317 || st->discard >= AVDISCARD_ALL
319 url_fseek(&s->pb, next, SEEK_SET);
322 if ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY)
323 av_add_index_entry(st, pos, pts, size, 0, AVINDEX_KEYFRAME);
327 // if not streamed and no duration from metadata then seek to end to find the duration from the timestamps
328 if(!url_is_streamed(&s->pb) && s->duration==AV_NOPTS_VALUE){
330 const int pos= url_ftell(&s->pb);
331 const int fsize= url_fsize(&s->pb);
332 url_fseek(&s->pb, fsize-4, SEEK_SET);
333 size= get_be32(&s->pb);
334 url_fseek(&s->pb, fsize-3-size, SEEK_SET);
335 if(size == get_be24(&s->pb) + 11){
336 s->duration= get_be24(&s->pb) * (int64_t)AV_TIME_BASE / 1000;
338 url_fseek(&s->pb, pos, SEEK_SET);
342 if(!st->codec->sample_rate || !st->codec->bits_per_sample || (!st->codec->codec_id && !st->codec->codec_tag)) {
343 st->codec->channels = (flags & FLV_AUDIO_CHANNEL_MASK) == FLV_STEREO ? 2 : 1;
344 if((flags & FLV_AUDIO_CODECID_MASK) == FLV_CODECID_NELLYMOSER_8HZ_MONO)
345 st->codec->sample_rate= 8000;
347 st->codec->sample_rate = (44100 << ((flags & FLV_AUDIO_SAMPLERATE_MASK) >> FLV_AUDIO_SAMPLERATE_OFFSET) >> 3);
348 st->codec->bits_per_sample = (flags & FLV_AUDIO_SAMPLESIZE_MASK) ? 16 : 8;
349 flv_set_audio_codec(s, st, flags & FLV_AUDIO_CODECID_MASK);
352 size -= flv_set_video_codec(s, st, flags & FLV_VIDEO_CODECID_MASK);
355 ret= av_get_packet(&s->pb, pkt, size - 1);
359 /* note: we need to modify the packet size here to handle the last
363 pkt->stream_index = st->index;
365 if (is_audio || ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY))
366 pkt->flags |= PKT_FLAG_KEY;
371 static int flv_read_close(AVFormatContext *s)
376 static int flv_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
378 AVStream *st = s->streams[stream_index];
379 int index = av_index_search_timestamp(st, timestamp, flags);
382 url_fseek(&s->pb, st->index_entries[index].pos, SEEK_SET);
387 AVInputFormat flv_demuxer = {
397 .value = CODEC_ID_FLV1,