aac5773f
 hucm
功能基本完成，接口待打磨
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/*
* Copyright (c) 2011 Justin Ruggles
*
* 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
*/
/**
* mov 'chan' tag reading/writing.
* @author Justin Ruggles
*/
#ifndef AVFORMAT_MOV_CHAN_H
#define AVFORMAT_MOV_CHAN_H
#include <stdint.h>
#include "libavcodec/avcodec.h"
#include "avformat.h"
/**
* Get the channel layout for the specified channel layout tag.
*
* @param[in] tag channel layout tag
* @param[out] bitmap channel bitmap (only used if needed)
* @return channel layout
*/
uint64_t ff_mov_get_channel_layout(uint32_t tag, uint32_t bitmap);
/**
* Get the channel layout tag for the specified codec id and channel layout.
* If the layout tag was not found, use a channel bitmap if possible.
*
* @param[in] codec_id codec id
* @param[in] channel_layout channel layout
* @param[out] bitmap channel bitmap
* @return channel layout tag
*/
uint32_t ff_mov_get_channel_layout_tag(enum AVCodecID codec_id,
uint64_t channel_layout,
uint32_t *bitmap);
/**
* Read 'chan' tag from the input stream.
*
* @param s AVFormatContext
* @param pb AVIOContext
* @param st The stream to set codec values for
* @param size Remaining size in the 'chan' tag
* @return 0 if ok, or negative AVERROR code on failure
*/
int ff_mov_read_chan(AVFormatContext *s, AVIOContext *pb, AVStream *st,
int64_t size);
#endif /* AVFORMAT_MOV_CHAN_H */
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