FFmpeg: libavformat/flacenc_header.c Source File

00001 /*
00002  * raw FLAC muxer
00003  * Copyright (C) 2009 Justin Ruggles
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * FFmpeg is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00022 #include "libavcodec/flac.h"
00023 #include "libavcodec/bytestream.h"
00024 #include "avformat.h"
00025 #include "flacenc.h"
00026 
00027 int ff_flac_write_header(AVIOContext *pb, AVCodecContext *codec,
00028                          int last_block)
00029 {
00030     uint8_t header[8] = {
00031         0x66, 0x4C, 0x61, 0x43, 0x00, 0x00, 0x00, 0x22
00032     };
00033     uint8_t *streaminfo;
00034     enum FLACExtradataFormat format;
00035 
00036     header[4] = last_block ? 0x80 : 0x00;
00037     if (!avpriv_flac_is_extradata_valid(codec, &format, &streaminfo))
00038         return -1;
00039 
00040     /* write "fLaC" stream marker and first metadata block header */
00041     avio_write(pb, header, 8);
00042 
00043     /* write STREAMINFO */
00044     avio_write(pb, streaminfo, FLAC_STREAMINFO_SIZE);
00045 
00046     return 0;
00047 }