84 lines
2.1 KiB
C++
84 lines
2.1 KiB
C++
/*
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* Copyright (C) 2003-2013 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_CONVERTER_HXX
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#define MPD_PCM_CHANNELS_CONVERTER_HXX
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#include "check.h"
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#include "AudioFormat.hxx"
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#include "PcmBuffer.hxx"
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#ifndef NDEBUG
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#include <assert.h>
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#endif
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class Error;
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template<typename T> struct ConstBuffer;
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/**
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* A class that converts samples from one format to another.
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*/
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class PcmChannelsConverter {
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SampleFormat format;
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unsigned src_channels, dest_channels;
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PcmBuffer buffer;
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public:
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#ifndef NDEBUG
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PcmChannelsConverter()
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:format(SampleFormat::UNDEFINED) {}
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~PcmChannelsConverter() {
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assert(format == SampleFormat::UNDEFINED);
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}
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#endif
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/**
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* Opens the object, prepare for Convert().
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*
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* @param format the sample format
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* @param src_channels the number of source channels
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* @param dest_channels the number of destination channels
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* @param error location to store the error
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* @return true on success
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*/
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bool Open(SampleFormat format,
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unsigned src_channels, unsigned dest_channels,
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Error &error);
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/**
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* Closes the object. After that, you may call Open() again.
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*/
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void Close();
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/**
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* Convert a block of PCM data.
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*
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* @param src the input buffer
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* @param error location to store the error
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* @return the destination buffer on success,
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* ConstBuffer::Null() on error
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*/
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gcc_pure
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ConstBuffer<void> Convert(ConstBuffer<void> src, Error &error);
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};
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#endif
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