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00021 #include "avformat.h"
00022 #include "flv.h"
00023 #include "internal.h"
00024 #include "avc.h"
00025 #include "metadata.h"
00026
00027 #undef NDEBUG
00028 #include <assert.h>
00029
00030 static const AVCodecTag flv_video_codec_ids[] = {
00031 {CODEC_ID_FLV1, FLV_CODECID_H263 },
00032 {CODEC_ID_FLASHSV, FLV_CODECID_SCREEN},
00033 {CODEC_ID_FLASHSV2, FLV_CODECID_SCREEN2},
00034 {CODEC_ID_VP6F, FLV_CODECID_VP6 },
00035 {CODEC_ID_VP6, FLV_CODECID_VP6 },
00036 {CODEC_ID_H264, FLV_CODECID_H264 },
00037 {CODEC_ID_NONE, 0}
00038 };
00039
00040 static const AVCodecTag flv_audio_codec_ids[] = {
00041 {CODEC_ID_MP3, FLV_CODECID_MP3 >> FLV_AUDIO_CODECID_OFFSET},
00042 {CODEC_ID_PCM_U8, FLV_CODECID_PCM >> FLV_AUDIO_CODECID_OFFSET},
00043 {CODEC_ID_PCM_S16BE, FLV_CODECID_PCM >> FLV_AUDIO_CODECID_OFFSET},
00044 {CODEC_ID_PCM_S16LE, FLV_CODECID_PCM_LE >> FLV_AUDIO_CODECID_OFFSET},
00045 {CODEC_ID_ADPCM_SWF, FLV_CODECID_ADPCM >> FLV_AUDIO_CODECID_OFFSET},
00046 {CODEC_ID_AAC, FLV_CODECID_AAC >> FLV_AUDIO_CODECID_OFFSET},
00047 {CODEC_ID_NELLYMOSER, FLV_CODECID_NELLYMOSER >> FLV_AUDIO_CODECID_OFFSET},
00048 {CODEC_ID_SPEEX, FLV_CODECID_SPEEX >> FLV_AUDIO_CODECID_OFFSET},
00049 {CODEC_ID_NONE, 0}
00050 };
00051
00052 typedef struct FLVContext {
00053 int reserved;
00054 int64_t duration_offset;
00055 int64_t filesize_offset;
00056 int64_t duration;
00057 int delay;
00058 int64_t last_video_ts;
00059 } FLVContext;
00060
00061 static int get_audio_flags(AVCodecContext *enc){
00062 int flags = (enc->bits_per_coded_sample == 16) ? FLV_SAMPLESSIZE_16BIT : FLV_SAMPLESSIZE_8BIT;
00063
00064 if (enc->codec_id == CODEC_ID_AAC)
00065 return FLV_CODECID_AAC | FLV_SAMPLERATE_44100HZ | FLV_SAMPLESSIZE_16BIT | FLV_STEREO;
00066 else if (enc->codec_id == CODEC_ID_SPEEX) {
00067 if (enc->sample_rate != 16000) {
00068 av_log(enc, AV_LOG_ERROR, "flv only supports wideband (16kHz) Speex audio\n");
00069 return -1;
00070 }
00071 if (enc->channels != 1) {
00072 av_log(enc, AV_LOG_ERROR, "flv only supports mono Speex audio\n");
00073 return -1;
00074 }
00075 if (enc->frame_size / 320 > 8) {
00076 av_log(enc, AV_LOG_WARNING, "Warning: Speex stream has more than "
00077 "8 frames per packet. Adobe Flash "
00078 "Player cannot handle this!\n");
00079 }
00080 return FLV_CODECID_SPEEX | FLV_SAMPLERATE_11025HZ | FLV_SAMPLESSIZE_16BIT;
00081 } else {
00082 switch (enc->sample_rate) {
00083 case 44100:
00084 flags |= FLV_SAMPLERATE_44100HZ;
00085 break;
00086 case 22050:
00087 flags |= FLV_SAMPLERATE_22050HZ;
00088 break;
00089 case 11025:
00090 flags |= FLV_SAMPLERATE_11025HZ;
00091 break;
00092 case 8000:
00093 case 5512:
00094 if(enc->codec_id != CODEC_ID_MP3){
00095 flags |= FLV_SAMPLERATE_SPECIAL;
00096 break;
00097 }
00098 default:
00099 av_log(enc, AV_LOG_ERROR, "flv does not support that sample rate, choose from (44100, 22050, 11025).\n");
00100 return -1;
00101 }
00102 }
00103
00104 if (enc->channels > 1) {
00105 flags |= FLV_STEREO;
00106 }
00107
00108 switch(enc->codec_id){
00109 case CODEC_ID_MP3:
00110 flags |= FLV_CODECID_MP3 | FLV_SAMPLESSIZE_16BIT;
00111 break;
00112 case CODEC_ID_PCM_U8:
00113 flags |= FLV_CODECID_PCM | FLV_SAMPLESSIZE_8BIT;
00114 break;
00115 case CODEC_ID_PCM_S16BE:
00116 flags |= FLV_CODECID_PCM | FLV_SAMPLESSIZE_16BIT;
00117 break;
00118 case CODEC_ID_PCM_S16LE:
00119 flags |= FLV_CODECID_PCM_LE | FLV_SAMPLESSIZE_16BIT;
00120 break;
00121 case CODEC_ID_ADPCM_SWF:
00122 flags |= FLV_CODECID_ADPCM | FLV_SAMPLESSIZE_16BIT;
00123 break;
00124 case CODEC_ID_NELLYMOSER:
00125 if (enc->sample_rate == 8000) {
00126 flags |= FLV_CODECID_NELLYMOSER_8KHZ_MONO | FLV_SAMPLESSIZE_16BIT;
00127 } else {
00128 flags |= FLV_CODECID_NELLYMOSER | FLV_SAMPLESSIZE_16BIT;
00129 }
00130 break;
00131 case 0:
00132 flags |= enc->codec_tag<<4;
00133 break;
00134 default:
00135 av_log(enc, AV_LOG_ERROR, "codec not compatible with flv\n");
00136 return -1;
00137 }
00138
00139 return flags;
00140 }
00141
00142 static void put_amf_string(AVIOContext *pb, const char *str)
00143 {
00144 size_t len = strlen(str);
00145 avio_wb16(pb, len);
00146 avio_write(pb, str, len);
00147 }
00148
00149 static void put_avc_eos_tag(AVIOContext *pb, unsigned ts) {
00150 avio_w8(pb, FLV_TAG_TYPE_VIDEO);
00151 avio_wb24(pb, 5);
00152 avio_wb24(pb, ts);
00153 avio_w8(pb, (ts >> 24) & 0x7F);
00154 avio_wb24(pb, 0);
00155 avio_w8(pb, 23);
00156 avio_w8(pb, 2);
00157 avio_wb24(pb, 0);
00158 avio_wb32(pb, 16);
00159 }
00160
00161 static void put_amf_double(AVIOContext *pb, double d)
00162 {
00163 avio_w8(pb, AMF_DATA_TYPE_NUMBER);
00164 avio_wb64(pb, av_dbl2int(d));
00165 }
00166
00167 static void put_amf_bool(AVIOContext *pb, int b) {
00168 avio_w8(pb, AMF_DATA_TYPE_BOOL);
00169 avio_w8(pb, !!b);
00170 }
00171
00172 static int flv_write_header(AVFormatContext *s)
00173 {
00174 AVIOContext *pb = s->pb;
00175 FLVContext *flv = s->priv_data;
00176 AVCodecContext *audio_enc = NULL, *video_enc = NULL;
00177 int i;
00178 double framerate = 0.0;
00179 int metadata_size_pos, data_size;
00180 AVMetadataTag *tag = NULL;
00181
00182 for(i=0; i<s->nb_streams; i++){
00183 AVCodecContext *enc = s->streams[i]->codec;
00184 if (enc->codec_type == AVMEDIA_TYPE_VIDEO) {
00185 if (s->streams[i]->r_frame_rate.den && s->streams[i]->r_frame_rate.num) {
00186 framerate = av_q2d(s->streams[i]->r_frame_rate);
00187 } else {
00188 framerate = 1/av_q2d(s->streams[i]->codec->time_base);
00189 }
00190 video_enc = enc;
00191 if(enc->codec_tag == 0) {
00192 av_log(enc, AV_LOG_ERROR, "video codec not compatible with flv\n");
00193 return -1;
00194 }
00195 } else {
00196 audio_enc = enc;
00197 if(get_audio_flags(enc)<0)
00198 return -1;
00199 }
00200 av_set_pts_info(s->streams[i], 32, 1, 1000);
00201 }
00202 avio_write(pb, "FLV", 3);
00203 avio_w8(pb,1);
00204 avio_w8(pb, FLV_HEADER_FLAG_HASAUDIO * !!audio_enc
00205 + FLV_HEADER_FLAG_HASVIDEO * !!video_enc);
00206 avio_wb32(pb,9);
00207 avio_wb32(pb,0);
00208
00209 for(i=0; i<s->nb_streams; i++){
00210 if(s->streams[i]->codec->codec_tag == 5){
00211 avio_w8(pb,8);
00212 avio_wb24(pb,0);
00213 avio_wb24(pb,0);
00214 avio_wb32(pb,0);
00215 avio_wb32(pb,11);
00216 flv->reserved=5;
00217 }
00218 }
00219
00220 flv->last_video_ts = -1;
00221
00222
00223 avio_w8(pb, 18);
00224 metadata_size_pos= avio_tell(pb);
00225 avio_wb24(pb, 0);
00226 avio_wb24(pb, 0);
00227 avio_wb32(pb, 0);
00228
00229
00230
00231
00232 avio_w8(pb, AMF_DATA_TYPE_STRING);
00233 put_amf_string(pb, "onMetaData");
00234
00235
00236 avio_w8(pb, AMF_DATA_TYPE_MIXEDARRAY);
00237 avio_wb32(pb, 5*!!video_enc + 5*!!audio_enc + 2);
00238
00239 put_amf_string(pb, "duration");
00240 flv->duration_offset= avio_tell(pb);
00241 put_amf_double(pb, s->duration / AV_TIME_BASE);
00242
00243 if(video_enc){
00244 put_amf_string(pb, "width");
00245 put_amf_double(pb, video_enc->width);
00246
00247 put_amf_string(pb, "height");
00248 put_amf_double(pb, video_enc->height);
00249
00250 put_amf_string(pb, "videodatarate");
00251 put_amf_double(pb, video_enc->bit_rate / 1024.0);
00252
00253 put_amf_string(pb, "framerate");
00254 put_amf_double(pb, framerate);
00255
00256 put_amf_string(pb, "videocodecid");
00257 put_amf_double(pb, video_enc->codec_tag);
00258 }
00259
00260 if(audio_enc){
00261 put_amf_string(pb, "audiodatarate");
00262 put_amf_double(pb, audio_enc->bit_rate / 1024.0);
00263
00264 put_amf_string(pb, "audiosamplerate");
00265 put_amf_double(pb, audio_enc->sample_rate);
00266
00267 put_amf_string(pb, "audiosamplesize");
00268 put_amf_double(pb, audio_enc->codec_id == CODEC_ID_PCM_U8 ? 8 : 16);
00269
00270 put_amf_string(pb, "stereo");
00271 put_amf_bool(pb, audio_enc->channels == 2);
00272
00273 put_amf_string(pb, "audiocodecid");
00274 put_amf_double(pb, audio_enc->codec_tag);
00275 }
00276
00277 while ((tag = av_metadata_get(s->metadata, "", tag, AV_METADATA_IGNORE_SUFFIX))) {
00278 put_amf_string(pb, tag->key);
00279 avio_w8(pb, AMF_DATA_TYPE_STRING);
00280 put_amf_string(pb, tag->value);
00281 }
00282
00283 put_amf_string(pb, "filesize");
00284 flv->filesize_offset= avio_tell(pb);
00285 put_amf_double(pb, 0);
00286
00287 put_amf_string(pb, "");
00288 avio_w8(pb, AMF_END_OF_OBJECT);
00289
00290
00291 data_size= avio_tell(pb) - metadata_size_pos - 10;
00292 avio_seek(pb, metadata_size_pos, SEEK_SET);
00293 avio_wb24(pb, data_size);
00294 avio_seek(pb, data_size + 10 - 3, SEEK_CUR);
00295 avio_wb32(pb, data_size + 11);
00296
00297 for (i = 0; i < s->nb_streams; i++) {
00298 AVCodecContext *enc = s->streams[i]->codec;
00299 if (enc->codec_id == CODEC_ID_AAC || enc->codec_id == CODEC_ID_H264) {
00300 int64_t pos;
00301 avio_w8(pb, enc->codec_type == AVMEDIA_TYPE_VIDEO ?
00302 FLV_TAG_TYPE_VIDEO : FLV_TAG_TYPE_AUDIO);
00303 avio_wb24(pb, 0);
00304 avio_wb24(pb, 0);
00305 avio_w8(pb, 0);
00306 avio_wb24(pb, 0);
00307 pos = avio_tell(pb);
00308 if (enc->codec_id == CODEC_ID_AAC) {
00309 avio_w8(pb, get_audio_flags(enc));
00310 avio_w8(pb, 0);
00311 avio_write(pb, enc->extradata, enc->extradata_size);
00312 } else {
00313 avio_w8(pb, enc->codec_tag | FLV_FRAME_KEY);
00314 avio_w8(pb, 0);
00315 avio_wb24(pb, 0);
00316 ff_isom_write_avcc(pb, enc->extradata, enc->extradata_size);
00317 }
00318 data_size = avio_tell(pb) - pos;
00319 avio_seek(pb, -data_size - 10, SEEK_CUR);
00320 avio_wb24(pb, data_size);
00321 avio_seek(pb, data_size + 10 - 3, SEEK_CUR);
00322 avio_wb32(pb, data_size + 11);
00323 }
00324 }
00325
00326 return 0;
00327 }
00328
00329 static int flv_write_trailer(AVFormatContext *s)
00330 {
00331 int64_t file_size;
00332
00333 AVIOContext *pb = s->pb;
00334 FLVContext *flv = s->priv_data;
00335 int i;
00336
00337
00338 for (i = 0; i < s->nb_streams; i++) {
00339 AVCodecContext *enc = s->streams[i]->codec;
00340 if (enc->codec_type == AVMEDIA_TYPE_VIDEO &&
00341 enc->codec_id == CODEC_ID_H264) {
00342 put_avc_eos_tag(pb, flv->last_video_ts);
00343 }
00344 }
00345
00346 file_size = avio_tell(pb);
00347
00348
00349 avio_seek(pb, flv->duration_offset, SEEK_SET);
00350 put_amf_double(pb, flv->duration / (double)1000);
00351 avio_seek(pb, flv->filesize_offset, SEEK_SET);
00352 put_amf_double(pb, file_size);
00353
00354 avio_seek(pb, file_size, SEEK_SET);
00355 return 0;
00356 }
00357
00358 static int flv_write_packet(AVFormatContext *s, AVPacket *pkt)
00359 {
00360 AVIOContext *pb = s->pb;
00361 AVCodecContext *enc = s->streams[pkt->stream_index]->codec;
00362 FLVContext *flv = s->priv_data;
00363 unsigned ts;
00364 int size= pkt->size;
00365 uint8_t *data= NULL;
00366 int flags, flags_size;
00367
00368
00369
00370 if(enc->codec_id == CODEC_ID_VP6 || enc->codec_id == CODEC_ID_VP6F ||
00371 enc->codec_id == CODEC_ID_AAC)
00372 flags_size= 2;
00373 else if(enc->codec_id == CODEC_ID_H264)
00374 flags_size= 5;
00375 else
00376 flags_size= 1;
00377
00378 if (enc->codec_type == AVMEDIA_TYPE_VIDEO) {
00379 avio_w8(pb, FLV_TAG_TYPE_VIDEO);
00380
00381 flags = enc->codec_tag;
00382 if(flags == 0) {
00383 av_log(enc, AV_LOG_ERROR, "video codec %X not compatible with flv\n",enc->codec_id);
00384 return -1;
00385 }
00386
00387 flags |= pkt->flags & AV_PKT_FLAG_KEY ? FLV_FRAME_KEY : FLV_FRAME_INTER;
00388 } else {
00389 assert(enc->codec_type == AVMEDIA_TYPE_AUDIO);
00390 flags = get_audio_flags(enc);
00391
00392 assert(size);
00393
00394 avio_w8(pb, FLV_TAG_TYPE_AUDIO);
00395 }
00396
00397 if (enc->codec_id == CODEC_ID_H264) {
00398
00399 if (enc->extradata_size > 0 && *(uint8_t*)enc->extradata != 1) {
00400 if (ff_avc_parse_nal_units_buf(pkt->data, &data, &size) < 0)
00401 return -1;
00402 }
00403 if (!flv->delay && pkt->dts < 0)
00404 flv->delay = -pkt->dts;
00405 }
00406
00407 ts = pkt->dts + flv->delay;
00408 if (enc->codec_type == AVMEDIA_TYPE_VIDEO) {
00409 if (flv->last_video_ts < ts)
00410 flv->last_video_ts = ts;
00411 }
00412 avio_wb24(pb,size + flags_size);
00413 avio_wb24(pb,ts);
00414 avio_w8(pb,(ts >> 24) & 0x7F);
00415 avio_wb24(pb,flv->reserved);
00416 avio_w8(pb,flags);
00417 if (enc->codec_id == CODEC_ID_VP6)
00418 avio_w8(pb,0);
00419 if (enc->codec_id == CODEC_ID_VP6F)
00420 avio_w8(pb, enc->extradata_size ? enc->extradata[0] : 0);
00421 else if (enc->codec_id == CODEC_ID_AAC)
00422 avio_w8(pb,1);
00423 else if (enc->codec_id == CODEC_ID_H264) {
00424 avio_w8(pb,1);
00425 avio_wb24(pb,pkt->pts - pkt->dts);
00426 }
00427
00428 avio_write(pb, data ? data : pkt->data, size);
00429
00430 avio_wb32(pb,size+flags_size+11);
00431 flv->duration = FFMAX(flv->duration, pkt->pts + flv->delay + pkt->duration);
00432
00433 put_flush_packet(pb);
00434
00435 av_free(data);
00436
00437 return 0;
00438 }
00439
00440 AVOutputFormat ff_flv_muxer = {
00441 "flv",
00442 NULL_IF_CONFIG_SMALL("FLV format"),
00443 "video/x-flv",
00444 "flv",
00445 sizeof(FLVContext),
00446 #if CONFIG_LIBMP3LAME
00447 CODEC_ID_MP3,
00448 #else
00449 CODEC_ID_ADPCM_SWF,
00450 #endif
00451 CODEC_ID_FLV1,
00452 flv_write_header,
00453 flv_write_packet,
00454 flv_write_trailer,
00455 .codec_tag= (const AVCodecTag* const []){flv_video_codec_ids, flv_audio_codec_ids, 0},
00456 .flags= AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS,
00457 };