96 lines
2.2 KiB
C++
96 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_LimiterReader.h"
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#include "AUD_Buffer.h"
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#include <iostream>
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AUD_LimiterReader::AUD_LimiterReader(AUD_IReader* reader,
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float start, float end) :
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AUD_EffectReader(reader)
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{
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m_end = (int)(end * reader->getSpecs().rate);
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if(start <= 0)
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m_start = 0;
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else
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{
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m_start = (int)(start * reader->getSpecs().rate);
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if(m_reader->isSeekable())
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m_reader->seek(m_start);
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else
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{
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// skip first m_start samples by reading them
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int length;
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sample_t* buffer;
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for(int i = m_start;
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i >= AUD_DEFAULT_BUFFER_SIZE;
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i -= AUD_DEFAULT_BUFFER_SIZE)
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{
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length = AUD_DEFAULT_BUFFER_SIZE;
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m_reader->read(length, buffer);
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length = i;
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}
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m_reader->read(length, buffer);
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}
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}
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}
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void AUD_LimiterReader::seek(int position)
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{
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m_reader->seek(position + m_start);
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}
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int AUD_LimiterReader::getLength()
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{
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int len = m_reader->getLength();
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if(m_reader->getType() != AUD_TYPE_BUFFER || len < 0 ||
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(len > m_end && m_end >= 0))
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len = m_end;
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return len - m_start;
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}
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int AUD_LimiterReader::getPosition()
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{
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return m_reader->getPosition() - m_start;
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}
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void AUD_LimiterReader::read(int & length, sample_t* & buffer)
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{
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if(m_end >= 0)
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{
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int position = m_reader->getPosition();
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if(position+length > m_end)
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length = m_end - position;
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if(length < 0)
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{
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length = 0;
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return;
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}
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}
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m_reader->read(length, buffer);
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}
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