63 lines
1.9 KiB
C
63 lines
1.9 KiB
C
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/*
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* raw FLAC muxer
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* Copyright (C) 2009 Justin Ruggles
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/channel_layout.h"
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#include "libavcodec/flac.h"
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#include "avformat.h"
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#include "flacenc.h"
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int ff_flac_write_header(AVIOContext *pb, const uint8_t *extradata,
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int extradata_size, int last_block)
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{
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uint8_t header[8] = {
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0x66, 0x4C, 0x61, 0x43, 0x00, 0x00, 0x00, 0x22
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};
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header[4] = last_block ? 0x80 : 0x00;
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if (extradata_size < FLAC_STREAMINFO_SIZE)
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return AVERROR_INVALIDDATA;
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/* write "fLaC" stream marker and first metadata block header */
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avio_write(pb, header, 8);
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/* write STREAMINFO */
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avio_write(pb, extradata, FLAC_STREAMINFO_SIZE);
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return 0;
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}
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int ff_flac_is_native_layout(uint64_t channel_layout)
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{
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if (channel_layout == AV_CH_LAYOUT_MONO ||
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channel_layout == AV_CH_LAYOUT_STEREO ||
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channel_layout == AV_CH_LAYOUT_SURROUND ||
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channel_layout == AV_CH_LAYOUT_QUAD ||
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channel_layout == AV_CH_LAYOUT_5POINT0 ||
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channel_layout == AV_CH_LAYOUT_5POINT1 ||
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channel_layout == AV_CH_LAYOUT_6POINT1 ||
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channel_layout == AV_CH_LAYOUT_7POINT1)
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return 1;
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return 0;
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}
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