/* * FLV muxer * Copyright (c) 2003 The FFmpeg Project. * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include "avformat.h" #include "flv.h" #include "riff.h" #undef NDEBUG #include <assert.h> static const AVCodecTag flv_video_codec_ids[] = { {CODEC_ID_FLV1, FLV_CODECID_H263 }, {CODEC_ID_FLASHSV, FLV_CODECID_SCREEN}, {CODEC_ID_VP6F, FLV_CODECID_VP6 }, {CODEC_ID_VP6, FLV_CODECID_VP6 }, {CODEC_ID_NONE, 0} }; static const AVCodecTag flv_audio_codec_ids[] = { {CODEC_ID_MP3, FLV_CODECID_MP3 >> FLV_AUDIO_CODECID_OFFSET}, {CODEC_ID_PCM_S8, FLV_CODECID_PCM_BE >> FLV_AUDIO_CODECID_OFFSET}, {CODEC_ID_PCM_S16BE, FLV_CODECID_PCM_BE >> FLV_AUDIO_CODECID_OFFSET}, {CODEC_ID_PCM_S16LE, FLV_CODECID_PCM_LE >> FLV_AUDIO_CODECID_OFFSET}, {CODEC_ID_ADPCM_SWF, FLV_CODECID_ADPCM >> FLV_AUDIO_CODECID_OFFSET}, {CODEC_ID_NONE, 0} }; typedef struct FLVContext { int hasAudio; int hasVideo; int reserved; offset_t duration_offset; offset_t filesize_offset; int64_t duration; } FLVContext; static int get_audio_flags(AVCodecContext *enc){ int flags = (enc->bits_per_sample == 16) ? FLV_SAMPLESSIZE_16BIT : FLV_SAMPLESSIZE_8BIT; switch (enc->sample_rate) { case 44100: flags |= FLV_SAMPLERATE_44100HZ; break; case 22050: flags |= FLV_SAMPLERATE_22050HZ; break; case 11025: flags |= FLV_SAMPLERATE_11025HZ; break; case 8000: //nellymoser only case 5512: //not mp3 flags |= FLV_SAMPLERATE_SPECIAL; break; default: av_log(enc, AV_LOG_ERROR, "flv does not support that sample rate, choose from (44100, 22050, 11025).\n"); return -1; } if (enc->channels > 1) { flags |= FLV_STEREO; } switch(enc->codec_id){ case CODEC_ID_MP3: flags |= FLV_CODECID_MP3 | FLV_SAMPLESSIZE_16BIT; break; case CODEC_ID_PCM_S8: flags |= FLV_CODECID_PCM_BE | FLV_SAMPLESSIZE_8BIT; break; case CODEC_ID_PCM_S16BE: flags |= FLV_CODECID_PCM_BE | FLV_SAMPLESSIZE_16BIT; break; case CODEC_ID_PCM_S16LE: flags |= FLV_CODECID_PCM_LE | FLV_SAMPLESSIZE_16BIT; break; case CODEC_ID_ADPCM_SWF: flags |= FLV_CODECID_ADPCM | FLV_SAMPLESSIZE_16BIT; break; case 0: flags |= enc->codec_tag<<4; break; default: av_log(enc, AV_LOG_ERROR, "codec not compatible with flv\n"); return -1; } return flags; } static void put_amf_string(ByteIOContext *pb, const char *str) { size_t len = strlen(str); put_be16(pb, len); put_buffer(pb, str, len); } static void put_amf_double(ByteIOContext *pb, double d) { put_byte(pb, AMF_DATA_TYPE_NUMBER); put_be64(pb, av_dbl2int(d)); } static void put_amf_bool(ByteIOContext *pb, int b) { put_byte(pb, AMF_DATA_TYPE_BOOL); put_byte(pb, !!b); } static int flv_write_header(AVFormatContext *s) { ByteIOContext *pb = &s->pb; FLVContext *flv = s->priv_data; int i, width, height, samplerate, samplesize, channels, audiocodecid, videocodecid; double framerate = 0.0; int metadata_size_pos, data_size; flv->hasAudio = 0; flv->hasVideo = 0; for(i=0; i<s->nb_streams; i++){ AVCodecContext *enc = s->streams[i]->codec; if (enc->codec_type == CODEC_TYPE_VIDEO) { width = enc->width; height = enc->height; if (s->streams[i]->r_frame_rate.den && s->streams[i]->r_frame_rate.num) { framerate = av_q2d(s->streams[i]->r_frame_rate); } else { framerate = 1/av_q2d(s->streams[i]->codec->time_base); } flv->hasVideo=1; videocodecid = enc->codec_tag; if(videocodecid == 0) { av_log(enc, AV_LOG_ERROR, "video codec not compatible with flv\n"); return -1; } } else { flv->hasAudio=1; samplerate = enc->sample_rate; channels = enc->channels; audiocodecid = enc->codec_tag; samplesize = (enc->codec_id == CODEC_ID_PCM_S8) ? 8 : 16; if(get_audio_flags(enc)<0) return -1; } av_set_pts_info(s->streams[i], 24, 1, 1000); /* 24 bit pts in ms */ } put_tag(pb,"FLV"); put_byte(pb,1); put_byte(pb, FLV_HEADER_FLAG_HASAUDIO * flv->hasAudio + FLV_HEADER_FLAG_HASVIDEO * flv->hasVideo); put_be32(pb,9); put_be32(pb,0); for(i=0; i<s->nb_streams; i++){ if(s->streams[i]->codec->codec_tag == 5){ put_byte(pb,8); // message type put_be24(pb,0); // include flags put_be24(pb,0); // time stamp put_be32(pb,0); // reserved put_be32(pb,11); // size flv->reserved=5; } } /* write meta_tag */ put_byte(pb, 18); // tag type META metadata_size_pos= url_ftell(pb); put_be24(pb, 0); // size of data part (sum of all parts below) put_be24(pb, 0); // time stamp put_be32(pb, 0); // reserved /* now data of data_size size */ /* first event name as a string */ put_byte(pb, AMF_DATA_TYPE_STRING); put_amf_string(pb, "onMetaData"); // 12 bytes /* mixed array (hash) with size and string/type/data tuples */ put_byte(pb, AMF_DATA_TYPE_MIXEDARRAY); put_be32(pb, 5*flv->hasVideo + 4*flv->hasAudio + 2); // +2 for duration and file size put_amf_string(pb, "duration"); flv->duration_offset= url_ftell(pb); put_amf_double(pb, 0); // delayed write if(flv->hasVideo){ put_amf_string(pb, "width"); put_amf_double(pb, width); put_amf_string(pb, "height"); put_amf_double(pb, height); put_amf_string(pb, "videodatarate"); put_amf_double(pb, s->bit_rate / 1024.0); put_amf_string(pb, "framerate"); put_amf_double(pb, framerate); put_amf_string(pb, "videocodecid"); put_amf_double(pb, videocodecid); } if(flv->hasAudio){ put_amf_string(pb, "audiosamplerate"); put_amf_double(pb, samplerate); put_amf_string(pb, "audiosamplesize"); put_amf_double(pb, samplesize); put_amf_string(pb, "stereo"); put_amf_bool(pb, (channels == 2)); put_amf_string(pb, "audiocodecid"); put_amf_double(pb, audiocodecid); } put_amf_string(pb, "filesize"); flv->filesize_offset= url_ftell(pb); put_amf_double(pb, 0); // delayed write put_amf_string(pb, ""); put_byte(pb, AMF_END_OF_OBJECT); /* write total size of tag */ data_size= url_ftell(pb) - metadata_size_pos - 10; url_fseek(pb, metadata_size_pos, SEEK_SET); put_be24(pb, data_size); url_fseek(pb, data_size + 10 - 3, SEEK_CUR); put_be32(pb, data_size + 11); return 0; } static int flv_write_trailer(AVFormatContext *s) { int64_t file_size; ByteIOContext *pb = &s->pb; FLVContext *flv = s->priv_data; file_size = url_ftell(pb); /* update informations */ url_fseek(pb, flv->duration_offset, SEEK_SET); put_amf_double(pb, flv->duration / (double)1000); url_fseek(pb, flv->filesize_offset, SEEK_SET); put_amf_double(pb, file_size); url_fseek(pb, file_size, SEEK_SET); return 0; } static int flv_write_packet(AVFormatContext *s, AVPacket *pkt) { ByteIOContext *pb = &s->pb; AVCodecContext *enc = s->streams[pkt->stream_index]->codec; FLVContext *flv = s->priv_data; int size= pkt->size; int flags; // av_log(s, AV_LOG_DEBUG, "type:%d pts: %"PRId64" size:%d\n", enc->codec_type, timestamp, size); if (enc->codec_type == CODEC_TYPE_VIDEO) { put_byte(pb, FLV_TAG_TYPE_VIDEO); flags = enc->codec_tag; if(flags == 0) { av_log(enc, AV_LOG_ERROR, "video codec %X not compatible with flv\n",enc->codec_id); return -1; } flags |= pkt->flags & PKT_FLAG_KEY ? FLV_FRAME_KEY : FLV_FRAME_INTER; } else { assert(enc->codec_type == CODEC_TYPE_AUDIO); flags = get_audio_flags(enc); assert(size); put_byte(pb, FLV_TAG_TYPE_AUDIO); } if ((enc->codec_id == CODEC_ID_VP6) || (enc->codec_id == CODEC_ID_VP6F)) put_be24(pb,size+2); // include the extra byte needed for VP6 in flv and flags else put_be24(pb,size+1); // include flags put_be24(pb,pkt->pts); put_be32(pb,flv->reserved); put_byte(pb,flags); if (enc->codec_id == CODEC_ID_VP6) put_byte(pb,0); if (enc->codec_id == CODEC_ID_VP6F) put_byte(pb, enc->extradata_size ? enc->extradata[0] : 0); put_buffer(pb, pkt->data, size); put_be32(pb,size+1+11); // previous tag size flv->duration = pkt->pts + pkt->duration; put_flush_packet(pb); return 0; } AVOutputFormat flv_muxer = { "flv", "flv format", "video/x-flv", "flv", sizeof(FLVContext), #ifdef CONFIG_LIBMP3LAME CODEC_ID_MP3, #else // CONFIG_LIBMP3LAME CODEC_ID_NONE, #endif // CONFIG_LIBMP3LAME CODEC_ID_FLV1, flv_write_header, flv_write_packet, flv_write_trailer, .codec_tag= (const AVCodecTag*[]){flv_video_codec_ids, flv_audio_codec_ids, 0}, };