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/*
* $Id$
*
* ***** BEGIN LGPL LICENSE BLOCK *****
*
* Copyright 2009 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 Lesser General Public License as published by
* the Free Software Foundation, either version 3 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with AudaSpace. If not, see <http://www.gnu.org/licenses/>.
*
* ***** END LGPL LICENSE BLOCK *****
*/
#include "AUD_SinusReader.h"
#include "AUD_Buffer.h"
#include <math.h>
#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif
AUD_SinusReader::AUD_SinusReader(double frequency, AUD_SampleRate sampleRate)
{
m_frequency = frequency;
m_position = 0;
m_buffer = new AUD_Buffer(); AUD_NEW("buffer")
m_sampleRate = sampleRate;
}
AUD_SinusReader::~AUD_SinusReader()
{
delete m_buffer; AUD_DELETE("buffer")
}
bool AUD_SinusReader::isSeekable()
{
return true;
}
void AUD_SinusReader::seek(int position)
{
m_position = position;
}
int AUD_SinusReader::getLength()
{
return -1;
}
int AUD_SinusReader::getPosition()
{
return m_position;
}
AUD_Specs AUD_SinusReader::getSpecs()
{
AUD_Specs specs;
specs.rate = m_sampleRate;
specs.format = AUD_FORMAT_S16;
specs.channels = AUD_CHANNELS_STEREO;
return specs;
}
AUD_ReaderType AUD_SinusReader::getType()
{
return AUD_TYPE_STREAM;
}
bool AUD_SinusReader::notify(AUD_Message &message)
{
return false;
}
void AUD_SinusReader::read(int & length, sample_t* & buffer)
{
// resize if necessary
if(m_buffer->getSize() < length*4)
m_buffer->resize(length*4);
// fill with sine data
short* buf = (short*) m_buffer->getBuffer();
for(int i=0; i < length; i++)
{
buf[i*2] = sin((m_position + i) * 2.0 * M_PI * m_frequency /
(float)m_sampleRate) * 32700;
buf[i*2+1] = buf[i*2];
}
buffer = (sample_t*)buf;
m_position += length;
}
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