100 lines
2.6 KiB
C++
100 lines
2.6 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_AccumulatorReader.h"
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#include "AUD_Buffer.h"
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#include <cstring>
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#define CC specs.channels + channel
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AUD_AccumulatorReader::AUD_AccumulatorReader(AUD_IReader* reader,
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bool additive) :
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AUD_EffectReader(reader),
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m_additive(additive)
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{
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AUD_Specs specs = reader->getSpecs();
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int samplesize = AUD_SAMPLE_SIZE(specs);
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m_buffer = new AUD_Buffer(); AUD_NEW("buffer")
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m_sums = new AUD_Buffer(samplesize); AUD_NEW("buffer")
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memset(m_sums->getBuffer(), 0, samplesize);
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m_prevs = new AUD_Buffer(samplesize); AUD_NEW("buffer")
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memset(m_prevs->getBuffer(), 0, samplesize);
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}
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AUD_AccumulatorReader::~AUD_AccumulatorReader()
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{
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delete m_buffer; AUD_DELETE("buffer")
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delete m_sums; AUD_DELETE("buffer")
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delete m_prevs; AUD_DELETE("buffer")
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}
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void AUD_AccumulatorReader::read(int & length, sample_t* & buffer)
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{
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sample_t* buf;
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sample_t* sums;
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sample_t* prevs;
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sums = m_sums->getBuffer();
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prevs = m_prevs->getBuffer();
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AUD_Specs specs = m_reader->getSpecs();
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m_reader->read(length, buf);
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if(m_buffer->getSize() < length * AUD_SAMPLE_SIZE(specs))
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m_buffer->resize(length * AUD_SAMPLE_SIZE(specs));
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buffer = m_buffer->getBuffer();
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if(m_additive)
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{
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for(int channel = 0; channel < specs.channels; channel++)
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{
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for(int i = 0; i < length; i++)
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{
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if(buf[i * CC] > prevs[channel])
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sums[channel] += buf[i * CC] - prevs[channel];
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buffer[i * CC] = sums[channel] + buf[i * CC];
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prevs[channel] = buf[i * CC];
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}
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}
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}
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else
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{
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for(int channel = 0; channel < specs.channels; channel++)
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{
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for(int i = 0; i < length * specs.channels; i++)
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{
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if(buf[i * CC] > prevs[channel])
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sums[channel] += buf[i * CC] - prevs[channel];
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buffer[i * CC] = sums[channel];
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prevs[channel] = buf[i * CC];
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}
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}
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}
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}
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