/* * FLV encoder. * Copyright (c) 2003 The FFmpeg Project. * * This library 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 of the License, or (at your option) any later version. * * This library 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 this library; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include "avformat.h" #undef NDEBUG #include <assert.h> typedef struct FLVContext { int hasAudio; int hasVideo; int reserved; } FLVContext; static void put_be24(ByteIOContext *pb, int value) { put_byte(pb, (value>>16) & 0xFF ); put_byte(pb, (value>> 8) & 0xFF ); put_byte(pb, (value>> 0) & 0xFF ); } static int get_audio_flags(AVCodecContext *enc){ int flags = 0x02; switch (enc->sample_rate) { case 44100: flags |= 0x0C; break; case 22050: flags |= 0x08; break; case 11025: flags |= 0x04; break; case 8000: //nellymoser only case 5512: //not mp3 flags |= 0x00; break; default: return -1; } if (enc->channels > 1) { flags |= 0x01; } switch(enc->codec_id){ case CODEC_ID_MP3: flags |= 0x20; break; case 0: flags |= enc->codec_tag<<4; break; default: return -1; } return flags; } static int flv_write_header(AVFormatContext *s) { ByteIOContext *pb = &s->pb; FLVContext *flv = s->priv_data; int i; flv->hasAudio = 0; flv->hasVideo = 0; put_tag(pb,"FLV"); put_byte(pb,1); put_byte(pb,0); // delayed write put_be32(pb,9); put_be32(pb,0); for(i=0; i<s->nb_streams; i++){ AVCodecContext *enc = &s->streams[i]->codec; av_set_pts_info(s->streams[i], 24, 1, 1000); /* 24 bit pts in ms */ if(enc->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; } if(enc->codec_type == CODEC_TYPE_AUDIO && get_audio_flags(enc)<0) return -1; } return 0; } static int flv_write_trailer(AVFormatContext *s) { int64_t file_size; int flags = 0; ByteIOContext *pb = &s->pb; FLVContext *flv = s->priv_data; file_size = url_ftell(pb); flags |= flv->hasAudio ? 4 : 0; flags |= flv->hasVideo ? 1 : 0; url_fseek(pb, 4, SEEK_SET); put_byte(pb,flags); 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: %lld size:%d\n", enc->codec_type, timestamp, size); if (enc->codec_type == CODEC_TYPE_VIDEO) { put_byte(pb, 9); flags = 2; // choose h263 flags |= pkt->flags & PKT_FLAG_KEY ? 0x10 : 0x20; // add keyframe indicator flv->hasVideo = 1; } else { assert(enc->codec_type == CODEC_TYPE_AUDIO); flags = get_audio_flags(enc); assert(size); put_byte(pb, 8); // We got audio! Make sure we set this to the global flags on closure flv->hasAudio = 1; } put_be24(pb,size+1); // include flags put_be24(pb,pkt->pts); put_be32(pb,flv->reserved); put_byte(pb,flags); put_buffer(pb, pkt->data, size); put_be32(pb,size+1+11); // reserved put_flush_packet(pb); return 0; } static AVOutputFormat flv_oformat = { "flv", "flv format", "video/x-flashvideo", "flv", sizeof(FLVContext), #ifdef CONFIG_MP3LAME CODEC_ID_MP3, #else // CONFIG_MP3LAME CODEC_ID_NONE, #endif // CONFIG_MP3LAME CODEC_ID_FLV1, flv_write_header, flv_write_packet, flv_write_trailer, }; int flvenc_init(void) { av_register_output_format(&flv_oformat); return 0; }