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/*******************************************************************************
* Copyright 2009-2016 Jörg Müller
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
******************************************************************************/
#include "respec/Mixer.h"
#include <algorithm>
#include <cstring>
AUD_NAMESPACE_BEGIN
Mixer::Mixer(DeviceSpecs specs) :
m_specs(specs)
{
switch(m_specs.format)
{
case FORMAT_U8:
m_convert = convert_float_u8;
break;
case FORMAT_S16:
m_convert = convert_float_s16;
break;
case FORMAT_S24:
#ifdef __BIG_ENDIAN__
m_convert = convert_float_s24_be;
#else
m_convert = convert_float_s24_le;
#endif
break;
case FORMAT_S32:
m_convert = convert_float_s32;
break;
case FORMAT_FLOAT32:
m_convert = convert_copy<float>;
break;
case FORMAT_FLOAT64:
m_convert = convert_float_double;
break;
default:
break;
}
}
DeviceSpecs Mixer::getSpecs() const
{
return m_specs;
}
void Mixer::setSpecs(Specs specs)
{
m_specs.specs = specs;
}
void Mixer::clear(int length)
{
m_buffer.assureSize(length * m_specs.channels * AUD_SAMPLE_SIZE(m_specs));
m_length = length;
std::memset(m_buffer.getBuffer(), 0, length * m_specs.channels * AUD_SAMPLE_SIZE(m_specs));
}
void Mixer::mix(sample_t* buffer, int start, int length, float volume)
{
sample_t* out = m_buffer.getBuffer();
length = (std::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 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 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);
}
AUD_NAMESPACE_END
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