AUD_DefaultMixer.cpp

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/*
 * $Id: AUD_DefaultMixer.cpp 35141 2011-02-25 10:21:56Z jesterking $
 *
 * ***** BEGIN GPL LICENSE BLOCK *****
 *
 * Copyright 2009-2011 Jörg Hermann Müller
 *
 * This file is part of AudaSpace.
 *
 * Audaspace is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * AudaSpace 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Audaspace; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * ***** END GPL LICENSE BLOCK *****
 */

#include "AUD_DefaultMixer.h"
#ifdef WITH_SAMPLERATE
#include "AUD_SRCResampleReader.h"
#else
#include "AUD_LinearResampleReader.h"
#endif
#include "AUD_ChannelMapperReader.h"
#include "AUD_ChannelMapperFactory.h"

#include <cstring>

AUD_DefaultMixer::AUD_DefaultMixer(AUD_DeviceSpecs specs) :
        AUD_Mixer(specs)
{
}

AUD_IReader* AUD_DefaultMixer::prepare(AUD_IReader* reader)
{
        // hacky for now, until a better channel mapper reader is available
        AUD_ChannelMapperFactory cmf(NULL, m_specs);

        AUD_Specs specs = reader->getSpecs();

        // if channel count is lower in output, rechannel before resampling
        if(specs.channels < m_specs.channels)
        {
                reader = new AUD_ChannelMapperReader(reader,
                                                                                         cmf.getMapping(specs.channels));
                specs.channels = m_specs.channels;
        }

        // resample
        if(specs.rate != m_specs.rate)
#ifdef WITH_SAMPLERATE
                reader = new AUD_SRCResampleReader(reader, m_specs.specs);
#else
                reader = new AUD_LinearResampleReader(reader, m_specs.specs);
#endif
        
        // rechannel
        if(specs.channels != m_specs.channels)
                reader = new AUD_ChannelMapperReader(reader,
                                                                                         cmf.getMapping(specs.channels));

        return reader;
}