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115 lines
4.3 KiB
115 lines
4.3 KiB
/* |
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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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/** |
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* @addtogroup lavu_audio |
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* @{ |
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*/ |
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/** |
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* @defgroup channel_masks Audio channel masks |
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* @{ |
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*/ |
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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 0x8000000000000000ULL |
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/** |
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* @} |
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* @defgroup channel_mask_c Audio channel convenience macros |
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* @{ |
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* */ |
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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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* @} |
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*/ |
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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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uint64_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, uint64_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(uint64_t channel_layout); |
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/** |
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* @} |
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*/ |
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#endif /* AVUTIL_AUDIOCONVERT_H */
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