85 lines
1.8 KiB
C++
85 lines
1.8 KiB
C++
/*
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* $Id$
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*
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* ***** BEGIN LGPL LICENSE BLOCK *****
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*
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* Copyright 2009 Jörg Hermann Müller
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*
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* This file is part of AudaSpace.
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*
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* AudaSpace is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* AudaSpace is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with AudaSpace. If not, see <http://www.gnu.org/licenses/>.
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*
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* ***** END LGPL LICENSE BLOCK *****
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*/
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#include "AUD_SinusReader.h"
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#include <cmath>
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#ifndef M_PI
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#define M_PI 3.14159265358979323846
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#endif
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AUD_SinusReader::AUD_SinusReader(float frequency, AUD_SampleRate sampleRate) :
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m_frequency(frequency),
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m_position(0),
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m_sampleRate(sampleRate)
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{
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}
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bool AUD_SinusReader::isSeekable() const
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{
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return true;
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}
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void AUD_SinusReader::seek(int position)
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{
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m_position = position;
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}
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int AUD_SinusReader::getLength() const
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{
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return -1;
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}
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int AUD_SinusReader::getPosition() const
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{
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return m_position;
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}
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AUD_Specs AUD_SinusReader::getSpecs() const
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{
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AUD_Specs specs;
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specs.rate = m_sampleRate;
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specs.channels = AUD_CHANNELS_MONO;
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return specs;
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}
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void AUD_SinusReader::read(int & length, sample_t* & buffer)
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{
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// resize if necessary
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if(m_buffer.getSize() < length * sizeof(sample_t))
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m_buffer.resize(length * sizeof(sample_t));
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// fill with sine data
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buffer = m_buffer.getBuffer();
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for(int i = 0; i < length; i++)
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{
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buffer[i] = sin((m_position + i) * 2 * M_PI * m_frequency /
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(float)m_sampleRate);
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}
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m_position += length;
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}
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