81 lines
2.8 KiB
C
81 lines
2.8 KiB
C
/*
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* Copyright (C) 2003-2011 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef MPD_PCM_CHANNELS_H
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#define MPD_PCM_CHANNELS_H
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#include <stdint.h>
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#include <stddef.h>
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struct pcm_buffer;
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/**
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* Changes the number of channels in 16 bit PCM data.
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*
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* @param buffer the destination pcm_buffer object
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* @param dest_channels the number of channels requested
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* @param src_channels the number of channels in the source buffer
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* @param src the source PCM buffer
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* @param src_size the number of bytes in #src
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* @param dest_size_r returns the number of bytes of the destination buffer
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* @return the destination buffer
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*/
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const int16_t *
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pcm_convert_channels_16(struct pcm_buffer *buffer,
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unsigned dest_channels,
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unsigned src_channels, const int16_t *src,
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size_t src_size, size_t *dest_size_r);
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/**
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* Changes the number of channels in 24 bit PCM data (aligned at 32
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* bit boundaries).
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*
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* @param buffer the destination pcm_buffer object
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* @param dest_channels the number of channels requested
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* @param src_channels the number of channels in the source buffer
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* @param src the source PCM buffer
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* @param src_size the number of bytes in #src
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* @param dest_size_r returns the number of bytes of the destination buffer
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* @return the destination buffer
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*/
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const int32_t *
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pcm_convert_channels_24(struct pcm_buffer *buffer,
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unsigned dest_channels,
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unsigned src_channels, const int32_t *src,
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size_t src_size, size_t *dest_size_r);
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/**
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* Changes the number of channels in 32 bit PCM data.
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*
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* @param buffer the destination pcm_buffer object
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* @param dest_channels the number of channels requested
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* @param src_channels the number of channels in the source buffer
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* @param src the source PCM buffer
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* @param src_size the number of bytes in #src
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* @param dest_size_r returns the number of bytes of the destination buffer
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* @return the destination buffer
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*/
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const int32_t *
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pcm_convert_channels_32(struct pcm_buffer *buffer,
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unsigned dest_channels,
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unsigned src_channels, const int32_t *src,
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size_t src_size, size_t *dest_size_r);
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#endif
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