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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 "generator/SquareReader.h"
#include <cmath>
AUD_NAMESPACE_BEGIN
SquareReader::SquareReader(float frequency, SampleRate sampleRate) :
m_frequency(frequency),
m_position(0),
m_sample(0),
m_sampleRate(sampleRate)
{
}
void SquareReader::setFrequency(float frequency)
{
m_frequency = frequency;
}
bool SquareReader::isSeekable() const
{
return true;
}
void SquareReader::seek(int position)
{
m_position = position;
m_sample = std::fmod(m_position * m_frequency / (float)m_sampleRate, 2.0f);
}
int SquareReader::getLength() const
{
return -1;
}
int SquareReader::getPosition() const
{
return m_position;
}
Specs SquareReader::getSpecs() const
{
Specs specs;
specs.rate = m_sampleRate;
specs.channels = CHANNELS_MONO;
return specs;
}
void SquareReader::read(int& length, bool& eos, sample_t* buffer)
{
float k = 2.0 * m_frequency / m_sampleRate;
for(int i = 0; i < length; i++)
{
m_sample += k;
if(m_sample >= 2.0f)
m_sample = std::fmod(m_sample, 2.0f);
buffer[i] = (m_sample < 1.0f) * 2.0f - 1.0f;
}
m_position += length;
eos = false;
}
AUD_NAMESPACE_END
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