forked from bartvdbraak/blender
112 lines
2.6 KiB
C++
112 lines
2.6 KiB
C++
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/*
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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_DelayReader.h"
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#include "AUD_Buffer.h"
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#include <cstring>
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AUD_DelayReader::AUD_DelayReader(AUD_IReader* reader, float delay) :
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AUD_EffectReader(reader)
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{
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m_delay = (int)(delay * reader->getSpecs().rate);
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m_remdelay = m_delay;
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m_buffer = new AUD_Buffer(); AUD_NEW("buffer")
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}
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AUD_DelayReader::~AUD_DelayReader()
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{
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delete m_buffer; AUD_DELETE("buffer")
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}
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void AUD_DelayReader::seek(int position)
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{
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if(position < 0)
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return;
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if(position < m_delay)
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{
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m_remdelay = m_delay - position;
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m_reader->seek(0);
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}
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else
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{
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m_remdelay = 0;
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m_reader->seek(position - m_delay);
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}
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}
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int AUD_DelayReader::getLength()
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{
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int len = m_reader->getLength();
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if(len < 0)
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return len;
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return len+m_delay;
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}
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int AUD_DelayReader::getPosition()
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{
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if(m_remdelay > 0)
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return m_delay-m_remdelay;
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return m_reader->getPosition() + m_delay;
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}
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void AUD_DelayReader::read(int & length, sample_t* & buffer)
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{
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if(m_remdelay > 0)
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{
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int samplesize = AUD_SAMPLE_SIZE(m_reader->getSpecs());
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if(m_buffer->getSize() < length*samplesize)
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m_buffer->resize(length*samplesize);
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if(length > m_remdelay)
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{
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if(getSpecs().format == AUD_FORMAT_U8)
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memset(m_buffer->getBuffer(), 0x80, m_remdelay*samplesize);
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else
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memset(m_buffer->getBuffer(), 0, m_remdelay*samplesize);
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int len = length - m_remdelay;
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m_reader->read(len, buffer);
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memcpy(m_buffer->getBuffer()+m_remdelay*samplesize,
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buffer, len*samplesize);
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if(len < length-m_remdelay)
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length = m_remdelay + len;
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m_remdelay = 0;
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}
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else
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{
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if(getSpecs().format == AUD_FORMAT_U8)
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memset(m_buffer->getBuffer(), 0x80, length*samplesize);
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else
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memset(m_buffer->getBuffer(), 0, length*samplesize);
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m_remdelay -= length;
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}
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buffer = m_buffer->getBuffer();
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}
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else
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m_reader->read(length, buffer);
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}
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