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96 lines
4.2 KiB
C
96 lines
4.2 KiB
C
/*
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* Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
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* Copyright (c) 2008 Peter Ross
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*
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* This file is part of Libav.
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*
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* Libav 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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* Libav 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 Libav; 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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#ifndef AVUTIL_AUDIOCONVERT_H
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#define AVUTIL_AUDIOCONVERT_H
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#include <stdint.h>
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/**
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* @file
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* audio conversion routines
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*/
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/* Audio channel masks */
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#define AV_CH_FRONT_LEFT 0x00000001
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#define AV_CH_FRONT_RIGHT 0x00000002
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#define AV_CH_FRONT_CENTER 0x00000004
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#define AV_CH_LOW_FREQUENCY 0x00000008
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#define AV_CH_BACK_LEFT 0x00000010
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#define AV_CH_BACK_RIGHT 0x00000020
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#define AV_CH_FRONT_LEFT_OF_CENTER 0x00000040
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#define AV_CH_FRONT_RIGHT_OF_CENTER 0x00000080
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#define AV_CH_BACK_CENTER 0x00000100
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#define AV_CH_SIDE_LEFT 0x00000200
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#define AV_CH_SIDE_RIGHT 0x00000400
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#define AV_CH_TOP_CENTER 0x00000800
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#define AV_CH_TOP_FRONT_LEFT 0x00001000
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#define AV_CH_TOP_FRONT_CENTER 0x00002000
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#define AV_CH_TOP_FRONT_RIGHT 0x00004000
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#define AV_CH_TOP_BACK_LEFT 0x00008000
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#define AV_CH_TOP_BACK_CENTER 0x00010000
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#define AV_CH_TOP_BACK_RIGHT 0x00020000
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#define AV_CH_STEREO_LEFT 0x20000000 ///< Stereo downmix.
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#define AV_CH_STEREO_RIGHT 0x40000000 ///< See AV_CH_STEREO_LEFT.
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/** Channel mask value used for AVCodecContext.request_channel_layout
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to indicate that the user requests the channel order of the decoder output
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to be the native codec channel order. */
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#define AV_CH_LAYOUT_NATIVE 0x8000000000000000LL
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/* Audio channel convenience macros */
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#define AV_CH_LAYOUT_MONO (AV_CH_FRONT_CENTER)
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#define AV_CH_LAYOUT_STEREO (AV_CH_FRONT_LEFT|AV_CH_FRONT_RIGHT)
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#define AV_CH_LAYOUT_2_1 (AV_CH_LAYOUT_STEREO|AV_CH_BACK_CENTER)
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#define AV_CH_LAYOUT_SURROUND (AV_CH_LAYOUT_STEREO|AV_CH_FRONT_CENTER)
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#define AV_CH_LAYOUT_4POINT0 (AV_CH_LAYOUT_SURROUND|AV_CH_BACK_CENTER)
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#define AV_CH_LAYOUT_2_2 (AV_CH_LAYOUT_STEREO|AV_CH_SIDE_LEFT|AV_CH_SIDE_RIGHT)
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#define AV_CH_LAYOUT_QUAD (AV_CH_LAYOUT_STEREO|AV_CH_BACK_LEFT|AV_CH_BACK_RIGHT)
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#define AV_CH_LAYOUT_5POINT0 (AV_CH_LAYOUT_SURROUND|AV_CH_SIDE_LEFT|AV_CH_SIDE_RIGHT)
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#define AV_CH_LAYOUT_5POINT1 (AV_CH_LAYOUT_5POINT0|AV_CH_LOW_FREQUENCY)
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#define AV_CH_LAYOUT_5POINT0_BACK (AV_CH_LAYOUT_SURROUND|AV_CH_BACK_LEFT|AV_CH_BACK_RIGHT)
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#define AV_CH_LAYOUT_5POINT1_BACK (AV_CH_LAYOUT_5POINT0_BACK|AV_CH_LOW_FREQUENCY)
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#define AV_CH_LAYOUT_7POINT0 (AV_CH_LAYOUT_5POINT0|AV_CH_BACK_LEFT|AV_CH_BACK_RIGHT)
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#define AV_CH_LAYOUT_7POINT1 (AV_CH_LAYOUT_5POINT1|AV_CH_BACK_LEFT|AV_CH_BACK_RIGHT)
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#define AV_CH_LAYOUT_7POINT1_WIDE (AV_CH_LAYOUT_5POINT1_BACK|AV_CH_FRONT_LEFT_OF_CENTER|AV_CH_FRONT_RIGHT_OF_CENTER)
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#define AV_CH_LAYOUT_STEREO_DOWNMIX (AV_CH_STEREO_LEFT|AV_CH_STEREO_RIGHT)
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/**
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* Return a channel layout id that matches name, 0 if no match.
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*/
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int64_t av_get_channel_layout(const char *name);
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/**
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* Return a description of a channel layout.
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* If nb_channels is <= 0, it is guessed from the channel_layout.
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*
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* @param buf put here the string containing the channel layout
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* @param buf_size size in bytes of the buffer
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*/
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void av_get_channel_layout_string(char *buf, int buf_size, int nb_channels, int64_t channel_layout);
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/**
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* Return the number of channels in the channel layout.
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*/
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int av_get_channel_layout_nb_channels(int64_t channel_layout);
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#endif /* AVUTIL_AUDIOCONVERT_H */
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