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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 "fx/ModulatorReader.h"
#include "Exception.h"
#include <algorithm>
#include <cstring>
AUD_NAMESPACE_BEGIN
ModulatorReader::ModulatorReader(std::shared_ptr<IReader> reader1, std::shared_ptr<IReader> reader2) :
m_reader1(reader1), m_reader2(reader2)
{
}
ModulatorReader::~ModulatorReader()
{
}
bool ModulatorReader::isSeekable() const
{
return m_reader1->isSeekable() && m_reader2->isSeekable();
}
void ModulatorReader::seek(int position)
{
m_reader1->seek(position);
m_reader2->seek(position);
}
int ModulatorReader::getLength() const
{
int len1 = m_reader1->getLength();
int len2 = m_reader2->getLength();
if((len1 < 0) || (len2 < 0))
return -1;
return std::max(len1, len2);
}
int ModulatorReader::getPosition() const
{
int pos1 = m_reader1->getPosition();
int pos2 = m_reader2->getPosition();
return std::max(pos1, pos2);
}
Specs ModulatorReader::getSpecs() const
{
return m_reader1->getSpecs();
}
void ModulatorReader::read(int& length, bool& eos, sample_t* buffer)
{
Specs specs = m_reader1->getSpecs();
Specs s2 = m_reader2->getSpecs();
if(!AUD_COMPARE_SPECS(specs, s2))
AUD_THROW(StateException, "Two readers with different specifiactions cannot be modulated.");
int samplesize = AUD_SAMPLE_SIZE(specs);
m_buffer.assureSize(length * samplesize);
int len1 = length;
m_reader1->read(len1, eos, buffer);
if(len1 < length)
std::memset(buffer + len1 * specs.channels, 0, (length - len1) * samplesize);
int len2 = length;
bool eos2;
sample_t* buf = m_buffer.getBuffer();
m_reader2->read(len2, eos2, buf);
for(int i = 0; i < len2 * specs.channels; i++)
buffer[i] *= buf[i];
length = std::max(len1, len2);
eos &= eos2;
}
AUD_NAMESPACE_END
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