105 lines
2.2 KiB
C++
105 lines
2.2 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 "AUD_Buffer.h"
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#include <math.h>
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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(double frequency, AUD_SampleRate sampleRate)
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{
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m_frequency = frequency;
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m_position = 0;
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m_buffer = new AUD_Buffer(); AUD_NEW("buffer")
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m_sampleRate = sampleRate;
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}
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AUD_SinusReader::~AUD_SinusReader()
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{
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delete m_buffer; AUD_DELETE("buffer")
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}
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bool AUD_SinusReader::isSeekable()
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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()
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{
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return -1;
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}
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int AUD_SinusReader::getPosition()
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{
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return m_position;
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}
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AUD_Specs AUD_SinusReader::getSpecs()
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{
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AUD_Specs specs;
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specs.rate = m_sampleRate;
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specs.format = AUD_FORMAT_S16;
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specs.channels = AUD_CHANNELS_STEREO;
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return specs;
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}
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AUD_ReaderType AUD_SinusReader::getType()
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{
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return AUD_TYPE_STREAM;
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}
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bool AUD_SinusReader::notify(AUD_Message &message)
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{
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return false;
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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*4)
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m_buffer->resize(length*4);
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// fill with sine data
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short* buf = (short*) m_buffer->getBuffer();
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for(int i=0; i < length; i++)
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{
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buf[i*2] = sin((m_position + i) * 2.0 * M_PI * m_frequency /
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(float)m_sampleRate) * 32700;
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buf[i*2+1] = buf[i*2];
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}
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buffer = (sample_t*)buf;
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m_position += length;
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}
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