100 lines
2.2 KiB
C++
100 lines
2.2 KiB
C++
/*
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* $Id$
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*
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* ***** BEGIN GPL LICENSE BLOCK *****
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*
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* Copyright 2009-2011 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 General Public License as published by
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* the Free Software Foundation; either version 2 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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Audaspace; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* ***** END GPL LICENSE BLOCK *****
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*/
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/** \file audaspace/FX/AUD_DelayReader.cpp
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* \ingroup audfx
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*/
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#include "AUD_DelayReader.h"
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#include <cstring>
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AUD_DelayReader::AUD_DelayReader(AUD_Reference<AUD_IReader> reader, float delay) :
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AUD_EffectReader(reader),
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m_delay(int(delay * reader->getSpecs().rate)),
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m_remdelay(int(delay * reader->getSpecs().rate))
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{
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}
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void AUD_DelayReader::seek(int position)
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{
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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() const
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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() const
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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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AUD_Specs specs = m_reader->getSpecs();
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int samplesize = AUD_SAMPLE_SIZE(specs);
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if(length > m_remdelay)
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{
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memset(buffer, 0, m_remdelay * samplesize);
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int len = length - m_remdelay;
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m_reader->read(len, buffer + m_remdelay * specs.channels);
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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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memset(buffer, 0, length * samplesize);
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m_remdelay -= length;
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}
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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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