| /* |
| * 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" |
| #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_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_S8, 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_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 { |
| 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_S8: |
| 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 == CODEC_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 + 4*!!audio_enc + 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(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_S8 ? 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 == CODEC_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 == 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_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, |
| }; |
