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00027 #include "libavutil/avstring.h"
00028 #include "libavcodec/bytestream.h"
00029 #include "libavcodec/mpeg4audio.h"
00030 #include "avformat.h"
00031 #include "flv.h"
00032
00033 typedef struct {
00034 int wrong_dts;
00035 } FLVContext;
00036
00037 static int flv_probe(AVProbeData *p)
00038 {
00039 const uint8_t *d;
00040
00041 d = p->buf;
00042 if (d[0] == 'F' && d[1] == 'L' && d[2] == 'V' && d[3] < 5 && d[5]==0 && AV_RB32(d+5)>8) {
00043 return AVPROBE_SCORE_MAX;
00044 }
00045 return 0;
00046 }
00047
00048 static void flv_set_audio_codec(AVFormatContext *s, AVStream *astream, int flv_codecid) {
00049 AVCodecContext *acodec = astream->codec;
00050 switch(flv_codecid) {
00051
00052 case FLV_CODECID_PCM:
00053 acodec->codec_id = acodec->bits_per_coded_sample == 8 ? CODEC_ID_PCM_U8 :
00054 #if HAVE_BIGENDIAN
00055 CODEC_ID_PCM_S16BE;
00056 #else
00057 CODEC_ID_PCM_S16LE;
00058 #endif
00059 break;
00060 case FLV_CODECID_PCM_LE:
00061 acodec->codec_id = acodec->bits_per_coded_sample == 8 ? CODEC_ID_PCM_U8 : CODEC_ID_PCM_S16LE; break;
00062 case FLV_CODECID_AAC : acodec->codec_id = CODEC_ID_AAC; break;
00063 case FLV_CODECID_ADPCM: acodec->codec_id = CODEC_ID_ADPCM_SWF; break;
00064 case FLV_CODECID_SPEEX:
00065 acodec->codec_id = CODEC_ID_SPEEX;
00066 acodec->sample_rate = 16000;
00067 break;
00068 case FLV_CODECID_MP3 : acodec->codec_id = CODEC_ID_MP3 ; astream->need_parsing = AVSTREAM_PARSE_FULL; break;
00069 case FLV_CODECID_NELLYMOSER_8KHZ_MONO:
00070 acodec->sample_rate = 8000;
00071 case FLV_CODECID_NELLYMOSER:
00072 acodec->codec_id = CODEC_ID_NELLYMOSER;
00073 break;
00074 default:
00075 av_log(s, AV_LOG_INFO, "Unsupported audio codec (%x)\n", flv_codecid >> FLV_AUDIO_CODECID_OFFSET);
00076 acodec->codec_tag = flv_codecid >> FLV_AUDIO_CODECID_OFFSET;
00077 }
00078 }
00079
00080 static int flv_set_video_codec(AVFormatContext *s, AVStream *vstream, int flv_codecid) {
00081 AVCodecContext *vcodec = vstream->codec;
00082 switch(flv_codecid) {
00083 case FLV_CODECID_H263 : vcodec->codec_id = CODEC_ID_FLV1 ; break;
00084 case FLV_CODECID_SCREEN: vcodec->codec_id = CODEC_ID_FLASHSV; break;
00085 case FLV_CODECID_SCREEN2: vcodec->codec_id = CODEC_ID_FLASHSV2; break;
00086 case FLV_CODECID_VP6 : vcodec->codec_id = CODEC_ID_VP6F ;
00087 case FLV_CODECID_VP6A :
00088 if(flv_codecid == FLV_CODECID_VP6A)
00089 vcodec->codec_id = CODEC_ID_VP6A;
00090 if(vcodec->extradata_size != 1) {
00091 vcodec->extradata_size = 1;
00092 vcodec->extradata = av_malloc(1);
00093 }
00094 vcodec->extradata[0] = get_byte(s->pb);
00095 return 1;
00096 case FLV_CODECID_H264:
00097 vcodec->codec_id = CODEC_ID_H264;
00098 return 3;
00099 default:
00100 av_log(s, AV_LOG_INFO, "Unsupported video codec (%x)\n", flv_codecid);
00101 vcodec->codec_tag = flv_codecid;
00102 }
00103
00104 return 0;
00105 }
00106
00107 static int amf_get_string(ByteIOContext *ioc, char *buffer, int buffsize) {
00108 int length = get_be16(ioc);
00109 if(length >= buffsize) {
00110 url_fskip(ioc, length);
00111 return -1;
00112 }
00113
00114 get_buffer(ioc, buffer, length);
00115
00116 buffer[length] = '\0';
00117
00118 return length;
00119 }
00120
00121 static int amf_parse_object(AVFormatContext *s, AVStream *astream, AVStream *vstream, const char *key, int64_t max_pos, int depth) {
00122 AVCodecContext *acodec, *vcodec;
00123 ByteIOContext *ioc;
00124 AMFDataType amf_type;
00125 char str_val[256];
00126 double num_val;
00127
00128 num_val = 0;
00129 ioc = s->pb;
00130
00131 amf_type = get_byte(ioc);
00132
00133 switch(amf_type) {
00134 case AMF_DATA_TYPE_NUMBER:
00135 num_val = av_int2dbl(get_be64(ioc)); break;
00136 case AMF_DATA_TYPE_BOOL:
00137 num_val = get_byte(ioc); break;
00138 case AMF_DATA_TYPE_STRING:
00139 if(amf_get_string(ioc, str_val, sizeof(str_val)) < 0)
00140 return -1;
00141 break;
00142 case AMF_DATA_TYPE_OBJECT: {
00143 unsigned int keylen;
00144
00145 while(url_ftell(ioc) < max_pos - 2 && (keylen = get_be16(ioc))) {
00146 url_fskip(ioc, keylen);
00147 if(amf_parse_object(s, NULL, NULL, NULL, max_pos, depth + 1) < 0)
00148 return -1;
00149 }
00150 if(get_byte(ioc) != AMF_END_OF_OBJECT)
00151 return -1;
00152 }
00153 break;
00154 case AMF_DATA_TYPE_NULL:
00155 case AMF_DATA_TYPE_UNDEFINED:
00156 case AMF_DATA_TYPE_UNSUPPORTED:
00157 break;
00158 case AMF_DATA_TYPE_MIXEDARRAY:
00159 url_fskip(ioc, 4);
00160 while(url_ftell(ioc) < max_pos - 2 && amf_get_string(ioc, str_val, sizeof(str_val)) > 0) {
00161
00162 if(amf_parse_object(s, astream, vstream, str_val, max_pos, depth + 1) < 0)
00163 return -1;
00164 }
00165 if(get_byte(ioc) != AMF_END_OF_OBJECT)
00166 return -1;
00167 break;
00168 case AMF_DATA_TYPE_ARRAY: {
00169 unsigned int arraylen, i;
00170
00171 arraylen = get_be32(ioc);
00172 for(i = 0; i < arraylen && url_ftell(ioc) < max_pos - 1; i++) {
00173 if(amf_parse_object(s, NULL, NULL, NULL, max_pos, depth + 1) < 0)
00174 return -1;
00175 }
00176 }
00177 break;
00178 case AMF_DATA_TYPE_DATE:
00179 url_fskip(ioc, 8 + 2);
00180 break;
00181 default:
00182 return -1;
00183 }
00184
00185 if(depth == 1 && key) {
00186 acodec = astream ? astream->codec : NULL;
00187 vcodec = vstream ? vstream->codec : NULL;
00188
00189 if(amf_type == AMF_DATA_TYPE_BOOL) {
00190 av_strlcpy(str_val, num_val > 0 ? "true" : "false", sizeof(str_val));
00191 av_metadata_set2(&s->metadata, key, str_val, 0);
00192 } else if(amf_type == AMF_DATA_TYPE_NUMBER) {
00193 snprintf(str_val, sizeof(str_val), "%.f", num_val);
00194 av_metadata_set2(&s->metadata, key, str_val, 0);
00195 if(!strcmp(key, "duration")) s->duration = num_val * AV_TIME_BASE;
00196 else if(!strcmp(key, "videodatarate") && vcodec && 0 <= (int)(num_val * 1024.0))
00197 vcodec->bit_rate = num_val * 1024.0;
00198 else if(!strcmp(key, "audiodatarate") && acodec && 0 <= (int)(num_val * 1024.0))
00199 acodec->bit_rate = num_val * 1024.0;
00200 } else if (amf_type == AMF_DATA_TYPE_STRING)
00201 av_metadata_set2(&s->metadata, key, str_val, 0);
00202 }
00203
00204 return 0;
00205 }
00206
00207 static int flv_read_metabody(AVFormatContext *s, int64_t next_pos) {
00208 AMFDataType type;
00209 AVStream *stream, *astream, *vstream;
00210 ByteIOContext *ioc;
00211 int i;
00212 char buffer[11];
00213
00214 astream = NULL;
00215 vstream = NULL;
00216 ioc = s->pb;
00217
00218
00219 type = get_byte(ioc);
00220 if(type != AMF_DATA_TYPE_STRING || amf_get_string(ioc, buffer, sizeof(buffer)) < 0 || strcmp(buffer, "onMetaData"))
00221 return -1;
00222
00223
00224 for(i = 0; i < s->nb_streams; i++) {
00225 stream = s->streams[i];
00226 if (stream->codec->codec_type == AVMEDIA_TYPE_AUDIO) astream = stream;
00227 else if(stream->codec->codec_type == AVMEDIA_TYPE_VIDEO) vstream = stream;
00228 }
00229
00230
00231 if(amf_parse_object(s, astream, vstream, buffer, next_pos, 0) < 0)
00232 return -1;
00233
00234 return 0;
00235 }
00236
00237 static AVStream *create_stream(AVFormatContext *s, int is_audio){
00238 AVStream *st = av_new_stream(s, is_audio);
00239 if (!st)
00240 return NULL;
00241 st->codec->codec_type = is_audio ? AVMEDIA_TYPE_AUDIO : AVMEDIA_TYPE_VIDEO;
00242 av_set_pts_info(st, 32, 1, 1000);
00243 return st;
00244 }
00245
00246 static int flv_read_header(AVFormatContext *s,
00247 AVFormatParameters *ap)
00248 {
00249 int offset, flags;
00250
00251 url_fskip(s->pb, 4);
00252 flags = get_byte(s->pb);
00253
00254
00255 if (!flags) {
00256 flags = FLV_HEADER_FLAG_HASVIDEO | FLV_HEADER_FLAG_HASAUDIO;
00257 av_log(s, AV_LOG_WARNING, "Broken FLV file, which says no streams present, this might fail\n");
00258 }
00259
00260 if((flags & (FLV_HEADER_FLAG_HASVIDEO|FLV_HEADER_FLAG_HASAUDIO))
00261 != (FLV_HEADER_FLAG_HASVIDEO|FLV_HEADER_FLAG_HASAUDIO))
00262 s->ctx_flags |= AVFMTCTX_NOHEADER;
00263
00264 if(flags & FLV_HEADER_FLAG_HASVIDEO){
00265 if(!create_stream(s, 0))
00266 return AVERROR(ENOMEM);
00267 }
00268 if(flags & FLV_HEADER_FLAG_HASAUDIO){
00269 if(!create_stream(s, 1))
00270 return AVERROR(ENOMEM);
00271 }
00272
00273 offset = get_be32(s->pb);
00274 url_fseek(s->pb, offset, SEEK_SET);
00275 url_fskip(s->pb, 4);
00276
00277 s->start_time = 0;
00278
00279 return 0;
00280 }
00281
00282 static int flv_get_extradata(AVFormatContext *s, AVStream *st, int size)
00283 {
00284 av_free(st->codec->extradata);
00285 st->codec->extradata = av_mallocz(size + FF_INPUT_BUFFER_PADDING_SIZE);
00286 if (!st->codec->extradata)
00287 return AVERROR(ENOMEM);
00288 st->codec->extradata_size = size;
00289 get_buffer(s->pb, st->codec->extradata, st->codec->extradata_size);
00290 return 0;
00291 }
00292
00293 static int flv_read_packet(AVFormatContext *s, AVPacket *pkt)
00294 {
00295 FLVContext *flv = s->priv_data;
00296 int ret, i, type, size, flags, is_audio;
00297 int64_t next, pos;
00298 int64_t dts, pts = AV_NOPTS_VALUE;
00299 AVStream *st = NULL;
00300
00301 for(;;url_fskip(s->pb, 4)){
00302 pos = url_ftell(s->pb);
00303 type = get_byte(s->pb);
00304 size = get_be24(s->pb);
00305 dts = get_be24(s->pb);
00306 dts |= get_byte(s->pb) << 24;
00307
00308 if (url_feof(s->pb))
00309 return AVERROR_EOF;
00310 url_fskip(s->pb, 3);
00311 flags = 0;
00312
00313 if(size == 0)
00314 continue;
00315
00316 next= size + url_ftell(s->pb);
00317
00318 if (type == FLV_TAG_TYPE_AUDIO) {
00319 is_audio=1;
00320 flags = get_byte(s->pb);
00321 size--;
00322 } else if (type == FLV_TAG_TYPE_VIDEO) {
00323 is_audio=0;
00324 flags = get_byte(s->pb);
00325 size--;
00326 if ((flags & 0xf0) == 0x50)
00327 goto skip;
00328 } else {
00329 if (type == FLV_TAG_TYPE_META && size > 13+1+4)
00330 flv_read_metabody(s, next);
00331 else
00332 av_log(s, AV_LOG_DEBUG, "skipping flv packet: type %d, size %d, flags %d\n", type, size, flags);
00333 skip:
00334 url_fseek(s->pb, next, SEEK_SET);
00335 continue;
00336 }
00337
00338
00339 if (!size)
00340 continue;
00341
00342
00343 for(i=0;i<s->nb_streams;i++) {
00344 st = s->streams[i];
00345 if (st->id == is_audio)
00346 break;
00347 }
00348 if(i == s->nb_streams){
00349 av_log(s, AV_LOG_ERROR, "invalid stream\n");
00350 st= create_stream(s, is_audio);
00351 s->ctx_flags &= ~AVFMTCTX_NOHEADER;
00352 }
00353
00354 if( (st->discard >= AVDISCARD_NONKEY && !((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY || is_audio))
00355 ||(st->discard >= AVDISCARD_BIDIR && ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_DISP_INTER && !is_audio))
00356 || st->discard >= AVDISCARD_ALL
00357 ){
00358 url_fseek(s->pb, next, SEEK_SET);
00359 continue;
00360 }
00361 if ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY)
00362 av_add_index_entry(st, pos, dts, size, 0, AVINDEX_KEYFRAME);
00363 break;
00364 }
00365
00366
00367 if(!url_is_streamed(s->pb) && (!s->duration || s->duration==AV_NOPTS_VALUE)){
00368 int size;
00369 const int64_t pos= url_ftell(s->pb);
00370 const int64_t fsize= url_fsize(s->pb);
00371 url_fseek(s->pb, fsize-4, SEEK_SET);
00372 size= get_be32(s->pb);
00373 url_fseek(s->pb, fsize-3-size, SEEK_SET);
00374 if(size == get_be24(s->pb) + 11){
00375 uint32_t ts = get_be24(s->pb);
00376 ts |= get_byte(s->pb) << 24;
00377 s->duration = ts * (int64_t)AV_TIME_BASE / 1000;
00378 }
00379 url_fseek(s->pb, pos, SEEK_SET);
00380 }
00381
00382 if(is_audio){
00383 if(!st->codec->channels || !st->codec->sample_rate || !st->codec->bits_per_coded_sample) {
00384 st->codec->channels = (flags & FLV_AUDIO_CHANNEL_MASK) == FLV_STEREO ? 2 : 1;
00385 st->codec->sample_rate = (44100 << ((flags & FLV_AUDIO_SAMPLERATE_MASK) >> FLV_AUDIO_SAMPLERATE_OFFSET) >> 3);
00386 st->codec->bits_per_coded_sample = (flags & FLV_AUDIO_SAMPLESIZE_MASK) ? 16 : 8;
00387 }
00388 if(!st->codec->codec_id){
00389 flv_set_audio_codec(s, st, flags & FLV_AUDIO_CODECID_MASK);
00390 }
00391 }else{
00392 size -= flv_set_video_codec(s, st, flags & FLV_VIDEO_CODECID_MASK);
00393 }
00394
00395 if (st->codec->codec_id == CODEC_ID_AAC ||
00396 st->codec->codec_id == CODEC_ID_H264) {
00397 int type = get_byte(s->pb);
00398 size--;
00399 if (st->codec->codec_id == CODEC_ID_H264) {
00400 int32_t cts = (get_be24(s->pb)+0xff800000)^0xff800000;
00401 pts = dts + cts;
00402 if (cts < 0) {
00403 flv->wrong_dts = 1;
00404 av_log(s, AV_LOG_WARNING, "negative cts, previous timestamps might be wrong\n");
00405 }
00406 if (flv->wrong_dts)
00407 dts = AV_NOPTS_VALUE;
00408 }
00409 if (type == 0) {
00410 if ((ret = flv_get_extradata(s, st, size)) < 0)
00411 return ret;
00412 if (st->codec->codec_id == CODEC_ID_AAC) {
00413 MPEG4AudioConfig cfg;
00414 ff_mpeg4audio_get_config(&cfg, st->codec->extradata,
00415 st->codec->extradata_size);
00416 st->codec->channels = cfg.channels;
00417 st->codec->sample_rate = cfg.sample_rate;
00418 dprintf(s, "mp4a config channels %d sample rate %d\n",
00419 st->codec->channels, st->codec->sample_rate);
00420 }
00421
00422 ret = AVERROR(EAGAIN);
00423 goto leave;
00424 }
00425 }
00426
00427
00428 if (!size) {
00429 ret = AVERROR(EAGAIN);
00430 goto leave;
00431 }
00432
00433 ret= av_get_packet(s->pb, pkt, size);
00434 if (ret < 0) {
00435 return AVERROR(EIO);
00436 }
00437
00438
00439 pkt->size = ret;
00440 pkt->dts = dts;
00441 pkt->pts = pts == AV_NOPTS_VALUE ? dts : pts;
00442 pkt->stream_index = st->index;
00443
00444 if (is_audio || ((flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY))
00445 pkt->flags |= AV_PKT_FLAG_KEY;
00446
00447 leave:
00448 url_fskip(s->pb, 4);
00449 return ret;
00450 }
00451
00452 static int flv_read_seek(AVFormatContext *s, int stream_index,
00453 int64_t ts, int flags)
00454 {
00455 return av_url_read_fseek(s->pb, stream_index, ts, flags);
00456 }
00457
00458 #if 0
00459 static int flv_read_seek2(AVFormatContext *s, int stream_index,
00460 int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
00461 {
00462 int ret = AVERROR(ENOSYS);
00463
00464 if (ts - min_ts > (uint64_t)(max_ts - ts)) flags |= AVSEEK_FLAG_BACKWARD;
00465
00466 if (url_is_streamed(s->pb)) {
00467 if (stream_index < 0) {
00468 stream_index = av_find_default_stream_index(s);
00469 if (stream_index < 0)
00470 return -1;
00471
00472
00473 ts = av_rescale_rnd(ts, 1000, AV_TIME_BASE,
00474 flags & AVSEEK_FLAG_BACKWARD ? AV_ROUND_DOWN : AV_ROUND_UP);
00475 }
00476 ret = av_url_read_fseek(s->pb, stream_index, ts, flags);
00477 }
00478
00479 if (ret == AVERROR(ENOSYS))
00480 ret = av_seek_frame(s, stream_index, ts, flags);
00481 return ret;
00482 }
00483 #endif
00484
00485 AVInputFormat flv_demuxer = {
00486 "flv",
00487 NULL_IF_CONFIG_SMALL("FLV format"),
00488 sizeof(FLVContext),
00489 flv_probe,
00490 flv_read_header,
00491 flv_read_packet,
00492 .read_seek = flv_read_seek,
00493 #if 0
00494 .read_seek2 = flv_read_seek2,
00495 #endif
00496 .extensions = "flv",
00497 .value = CODEC_ID_FLV1,
00498 };