87 lines
2.3 KiB
C++
87 lines
2.3 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_EnvelopeReader.h"
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#include "AUD_Buffer.h"
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#include <cstring>
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#include <cmath>
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AUD_EnvelopeReader::AUD_EnvelopeReader(AUD_IReader* reader, float attack,
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float release, float threshold,
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float arthreshold) :
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AUD_EffectReader(reader),
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m_threshold(threshold)
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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_envelopes = new AUD_Buffer(samplesize);
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AUD_NEW("buffer")
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memset(m_envelopes->getBuffer(), 0, samplesize);
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m_bAttack = pow(arthreshold, 1.0f/(specs.rate * attack));
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m_bRelease = pow(arthreshold, 1.0f/(specs.rate * release));
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}
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AUD_EnvelopeReader::~AUD_EnvelopeReader()
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{
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delete m_buffer; AUD_DELETE("buffer")
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delete m_envelopes; AUD_DELETE("buffer")
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}
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void AUD_EnvelopeReader::read(int & length, sample_t* & buffer)
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{
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sample_t* buf;
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sample_t* envelopes;
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envelopes = m_envelopes->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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sample_t value;
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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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value = fabs(buf[i * specs.channels + channel]);
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if(value < m_threshold)
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value = 0.0f;
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buffer[i * specs.channels + channel] = envelopes[channel] =
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((value > envelopes[channel]) ? m_bAttack : m_bRelease) *
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(envelopes[channel] - value) + value;
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}
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}
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}
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