forked from bartvdbraak/blender
112 lines
2.4 KiB
C++
112 lines
2.4 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_ReverseReader.h"
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#include "AUD_Buffer.h"
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#include <cstring>
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AUD_ReverseReader::AUD_ReverseReader(AUD_IReader* reader) :
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AUD_EffectReader(reader)
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{
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if(reader->getType() != AUD_TYPE_BUFFER)
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AUD_THROW(AUD_ERROR_READER);
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m_length = reader->getLength();
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if(m_length < 0)
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AUD_THROW(AUD_ERROR_READER);
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m_position = 0;
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m_buffer = new AUD_Buffer(); AUD_NEW("buffer")
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}
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AUD_ReverseReader::~AUD_ReverseReader()
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{
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delete m_buffer; AUD_DELETE("buffer")
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}
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void AUD_ReverseReader::seek(int position)
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{
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m_position = position;
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}
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int AUD_ReverseReader::getLength()
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{
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return m_length;
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}
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int AUD_ReverseReader::getPosition()
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{
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return m_position;
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}
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void AUD_ReverseReader::read(int & length, sample_t* & buffer)
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{
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// first correct the length
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if(m_position+length > m_length)
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length = m_length-m_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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int samplesize = AUD_SAMPLE_SIZE(getSpecs());
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// resize buffer if needed
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if(m_buffer->getSize() < length * samplesize)
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m_buffer->resize(length * samplesize);
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buffer = m_buffer->getBuffer();
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sample_t* buf;
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int len = length;
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// read from reader
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m_reader->seek(m_length-m_position-len);
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m_reader->read(len, buf);
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// set null if reader didn't give enough data
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if(len < length)
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{
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if(getSpecs().format == AUD_FORMAT_U8)
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memset(buffer, 0x80, (length-len)*samplesize);
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else
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memset(buffer, 0, (length-len)*samplesize);
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buffer += length-len;
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}
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// copy the samples reverted
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for(int i = 0; i < len; i++)
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memcpy(buffer + i * samplesize,
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buf + (len - 1 - i) * samplesize,
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samplesize);
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m_position += length;
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buffer = m_buffer->getBuffer();
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}
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