/* * 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 "internal.h" #include "avc.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_FLASHSV2, FLV_CODECID_SCREEN2}, {CODEC_ID_VP6F, FLV_CODECID_VP6 }, {CODEC_ID_VP6, FLV_CODECID_VP6 }, {CODEC_ID_H264, FLV_CODECID_H264 }, {CODEC_ID_NONE, 0} }; static const AVCodecTag flv_audio_codec_ids[] = { {CODEC_ID_MP3, FLV_CODECID_MP3 >> FLV_AUDIO_CODECID_OFFSET}, {CODEC_ID_PCM_U8, FLV_CODECID_PCM >> FLV_AUDIO_CODECID_OFFSET}, {CODEC_ID_PCM_S16BE, FLV_CODECID_PCM >> 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_AAC, FLV_CODECID_AAC >> FLV_AUDIO_CODECID_OFFSET}, {CODEC_ID_NELLYMOSER, FLV_CODECID_NELLYMOSER >> FLV_AUDIO_CODECID_OFFSET}, {CODEC_ID_SPEEX, FLV_CODECID_SPEEX >> FLV_AUDIO_CODECID_OFFSET}, {CODEC_ID_NONE, 0} }; typedef struct FLVContext { int reserved; int64_t duration_offset; int64_t filesize_offset; int64_t duration; int delay; ///< first dts delay for AVC } FLVContext; static int get_audio_flags(AVCodecContext *enc){ int flags = (enc->bits_per_coded_sample == 16) ? FLV_SAMPLESSIZE_16BIT : FLV_SAMPLESSIZE_8BIT; if (enc->codec_id == CODEC_ID_AAC) // specs force these parameters return FLV_CODECID_AAC | FLV_SAMPLERATE_44100HZ | FLV_SAMPLESSIZE_16BIT | FLV_STEREO; else if (enc->codec_id == CODEC_ID_SPEEX) { if (enc->sample_rate != 16000) { av_log(enc, AV_LOG_ERROR, "flv only supports wideband (16kHz) Speex audio\n"); return -1; } if (enc->channels != 1) { av_log(enc, AV_LOG_ERROR, "flv only supports mono Speex audio\n"); return -1; } if (enc->frame_size / 320 > 8) { av_log(enc, AV_LOG_WARNING, "Warning: Speex stream has more than " "8 frames per packet. Adobe Flash " "Player cannot handle this!\n"); } return FLV_CODECID_SPEEX | FLV_SAMPLERATE_11025HZ | FLV_SAMPLESSIZE_16BIT; } else { 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 if(enc->codec_id != CODEC_ID_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_U8: flags |= FLV_CODECID_PCM | FLV_SAMPLESSIZE_8BIT; break; case CODEC_ID_PCM_S16BE: flags |= FLV_CODECID_PCM | 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 CODEC_ID_NELLYMOSER: if (enc->sample_rate == 8000) { flags |= FLV_CODECID_NELLYMOSER_8KHZ_MONO | FLV_SAMPLESSIZE_16BIT; } else { flags |= FLV_CODECID_NELLYMOSER | 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; AVCodecContext *audio_enc = NULL, *video_enc = NULL; int i; double framerate = 0.0; int metadata_size_pos, data_size; for(i=0; i<s->nb_streams; i++){ AVCodecContext *enc = s->streams[i]->codec; if (enc->codec_type == AVMEDIA_TYPE_VIDEO) { 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); } video_enc = enc; if(enc->codec_tag == 0) { av_log(enc, AV_LOG_ERROR, "video codec not compatible with flv\n"); return -1; } } else { audio_enc = enc; if(get_audio_flags(enc)<0) return -1; } av_set_pts_info(s->streams[i], 32, 1, 1000); /* 32 bit pts in ms */ } put_tag(pb,"FLV"); put_byte(pb,1); put_byte(pb, FLV_HEADER_FLAG_HASAUDIO * !!audio_enc + FLV_HEADER_FLAG_HASVIDEO * !!video_enc); 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*!!video_enc + 5*!!audio_enc + 2); // +2 for duration and file size put_amf_string(pb, "duration"); flv->duration_offset= url_ftell(pb); put_amf_double(pb, s->duration / AV_TIME_BASE); // fill in the guessed duration, it'll be corrected later if incorrect if(video_enc){ put_amf_string(pb, "width"); put_amf_double(pb, video_enc->width); put_amf_string(pb, "height"); put_amf_double(pb, video_enc->height); put_amf_string(pb, "videodatarate"); put_amf_double(pb, video_enc->bit_rate / 1024.0); put_amf_string(pb, "framerate"); put_amf_double(pb, framerate); put_amf_string(pb, "videocodecid"); put_amf_double(pb, video_enc->codec_tag); } if(audio_enc){ put_amf_string(pb, "audiodatarate"); put_amf_double(pb, audio_enc->bit_rate / 1024.0); put_amf_string(pb, "audiosamplerate"); put_amf_double(pb, audio_enc->sample_rate); put_amf_string(pb, "audiosamplesize"); put_amf_double(pb, audio_enc->codec_id == CODEC_ID_PCM_U8 ? 8 : 16); put_amf_string(pb, "stereo"); put_amf_bool(pb, audio_enc->channels == 2); put_amf_string(pb, "audiocodecid"); put_amf_double(pb, audio_enc->codec_tag); } 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); for (i = 0; i < s->nb_streams; i++) { AVCodecContext *enc = s->streams[i]->codec; if (enc->codec_id == CODEC_ID_AAC || enc->codec_id == CODEC_ID_H264) { int64_t pos; put_byte(pb, enc->codec_type == AVMEDIA_TYPE_VIDEO ? FLV_TAG_TYPE_VIDEO : FLV_TAG_TYPE_AUDIO); put_be24(pb, 0); // size patched later put_be24(pb, 0); // ts put_byte(pb, 0); // ts ext put_be24(pb, 0); // streamid pos = url_ftell(pb); if (enc->codec_id == CODEC_ID_AAC) { put_byte(pb, get_audio_flags(enc)); put_byte(pb, 0); // AAC sequence header put_buffer(pb, enc->extradata, enc->extradata_size); } else { put_byte(pb, enc->codec_tag | FLV_FRAME_KEY); // flags put_byte(pb, 0); // AVC sequence header put_be24(pb, 0); // composition time ff_isom_write_avcc(pb, enc->extradata, enc->extradata_size); } data_size = url_ftell(pb) - pos; url_fseek(pb, -data_size - 10, SEEK_CUR); put_be24(pb, data_size); url_fseek(pb, data_size + 10 - 3, SEEK_CUR); put_be32(pb, data_size + 11); // previous tag size } } 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; unsigned ts; int size= pkt->size; uint8_t *data= NULL; int flags, flags_size; // av_log(s, AV_LOG_DEBUG, "type:%d pts: %"PRId64" size:%d\n", enc->codec_type, timestamp, size); if(enc->codec_id == CODEC_ID_VP6 || enc->codec_id == CODEC_ID_VP6F || enc->codec_id == CODEC_ID_AAC) flags_size= 2; else if(enc->codec_id == CODEC_ID_H264) flags_size= 5; else flags_size= 1; if (enc->codec_type == AVMEDIA_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 & AV_PKT_FLAG_KEY ? FLV_FRAME_KEY : FLV_FRAME_INTER; } else { assert(enc->codec_type == AVMEDIA_TYPE_AUDIO); flags = get_audio_flags(enc); assert(size); put_byte(pb, FLV_TAG_TYPE_AUDIO); } if (enc->codec_id == CODEC_ID_H264) { /* check if extradata looks like mp4 formated */ if (enc->extradata_size > 0 && *(uint8_t*)enc->extradata != 1) { if (ff_avc_parse_nal_units_buf(pkt->data, &data, &size) < 0) return -1; } if (!flv->delay && pkt->dts < 0) flv->delay = -pkt->dts; } ts = pkt->dts + flv->delay; // add delay to force positive dts put_be24(pb,size + flags_size); put_be24(pb,ts); put_byte(pb,(ts >> 24) & 0x7F); // timestamps are 32bits _signed_ put_be24(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); else if (enc->codec_id == CODEC_ID_AAC) put_byte(pb,1); // AAC raw else if (enc->codec_id == CODEC_ID_H264) { put_byte(pb,1); // AVC NALU put_be24(pb,pkt->pts - pkt->dts); } put_buffer(pb, data ? data : pkt->data, size); put_be32(pb,size+flags_size+11); // previous tag size flv->duration = FFMAX(flv->duration, pkt->pts + flv->delay + pkt->duration); put_flush_packet(pb); av_free(data); return 0; } AVOutputFormat flv_muxer = { "flv", NULL_IF_CONFIG_SMALL("FLV format"), "video/x-flv", "flv", sizeof(FLVContext), #if CONFIG_LIBMP3LAME CODEC_ID_MP3, #else // CONFIG_LIBMP3LAME CODEC_ID_ADPCM_SWF, #endif // CONFIG_LIBMP3LAME CODEC_ID_FLV1, flv_write_header, flv_write_packet, flv_write_trailer, .codec_tag= (const AVCodecTag* const []){flv_video_codec_ids, flv_audio_codec_ids, 0}, .flags= AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS, };