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/*
* ***** 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 *****
*/
/** \file audaspace/intern/AUD_Mixer.cpp
* \ingroup audaspaceintern
*/
#include "AUD_Mixer.h"
#include "AUD_IReader.h"
#include <cstring>
AUD_Mixer::AUD_Mixer(AUD_DeviceSpecs specs) :
m_specs(specs)
{
switch(m_specs.format)
{
case AUD_FORMAT_U8:
m_convert = AUD_convert_float_u8;
break;
case AUD_FORMAT_S16:
m_convert = AUD_convert_float_s16;
break;
case AUD_FORMAT_S24:
#ifdef __BIG_ENDIAN__
m_convert = AUD_convert_float_s24_be;
#else
m_convert = AUD_convert_float_s24_le;
#endif
break;
case AUD_FORMAT_S32:
m_convert = AUD_convert_float_s32;
break;
case AUD_FORMAT_FLOAT32:
m_convert = AUD_convert_copy<float>;
break;
case AUD_FORMAT_FLOAT64:
m_convert = AUD_convert_float_double;
break;
default:
break;
}
}
AUD_DeviceSpecs AUD_Mixer::getSpecs() const
{
return m_specs;
}
void AUD_Mixer::setSpecs(AUD_Specs specs)
{
m_specs.specs = specs;
}
void AUD_Mixer::clear(int length)
{
m_buffer.assureSize(length * m_specs.channels * AUD_SAMPLE_SIZE(m_specs));
m_length = length;
memset(m_buffer.getBuffer(), 0, length * m_specs.channels * AUD_SAMPLE_SIZE(m_specs));
}
void AUD_Mixer::mix(sample_t* buffer, int start, int length, float volume)
{
sample_t* out = m_buffer.getBuffer();
length = (AUD_MIN(m_length, length + start) - start) * m_specs.channels;
start *= m_specs.channels;
for(int i = 0; i < length; i++)
out[i + start] += buffer[i] * volume;
}
void AUD_Mixer::mix(sample_t* buffer, int start, int length, float volume_to, float volume_from)
{
sample_t* out = m_buffer.getBuffer();
length = (std::min(m_length, length + start) - start);
for(int i = 0; i < length; i++)
{
float volume = volume_from * (1.0f - i / float(length)) + volume_to * (i / float(length));
for(int c = 0; c < m_specs.channels; c++)
out[(i + start) * m_specs.channels + c] += buffer[i * m_specs.channels + c] * volume;
}
}
void AUD_Mixer::read(data_t* buffer, float volume)
{
sample_t* out = m_buffer.getBuffer();
for(int i = 0; i < m_length * m_specs.channels; i++)
out[i] *= volume;
m_convert(buffer, (data_t*) out, m_length * m_specs.channels);
}
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