forked from bartvdbraak/blender
113 lines
2.3 KiB
C++
113 lines
2.3 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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#include "AUD_LoopReader.h"
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#include "AUD_Buffer.h"
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#include <cstring>
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AUD_LoopReader::AUD_LoopReader(AUD_IReader* reader, int loop) :
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AUD_EffectReader(reader), m_count(loop), m_left(loop)
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{
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}
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void AUD_LoopReader::seek(int position)
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{
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int len = m_reader->getLength();
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if(len < 0)
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m_reader->seek(position);
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else
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{
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if(m_count >= 0)
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{
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m_left = m_count - (position / len);
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if(m_left < 0)
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m_left = 0;
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}
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m_reader->seek(position % len);
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}
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}
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int AUD_LoopReader::getLength() const
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{
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if(m_count < 0)
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return -1;
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return m_reader->getLength() * m_count;
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}
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int AUD_LoopReader::getPosition() const
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{
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return m_reader->getPosition() * (m_count < 0 ? 1 : m_count);
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}
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void AUD_LoopReader::read(int & length, sample_t* & buffer)
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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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int len = length;
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m_reader->read(len, buffer);
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if(len < length && m_left)
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{
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int pos = 0;
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if(m_buffer.getSize() < length * samplesize)
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m_buffer.resize(length * samplesize);
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sample_t* buf = m_buffer.getBuffer();
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memcpy(buf + pos * specs.channels, buffer, len * samplesize);
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pos += len;
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while(pos < length && m_left)
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{
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if(m_left > 0)
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m_left--;
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m_reader->seek(0);
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len = length - pos;
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m_reader->read(len, buffer);
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// prevent endless loop
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if(!len)
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break;
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memcpy(buf + pos * specs.channels, buffer, len * samplesize);
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pos += len;
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}
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length = pos;
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buffer = buf;
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}
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else
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length = len;
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}
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