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/*
* $Id$
*
* ***** BEGIN LGPL LICENSE BLOCK *****
*
* Copyright 2009 Jörg Hermann Müller
*
* This file is part of AudaSpace.
*
* AudaSpace is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* AudaSpace is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with AudaSpace. If not, see <http://www.gnu.org/licenses/>.
*
* ***** END LGPL LICENSE BLOCK *****
*/
#include "AUD_ReverseReader.h"
#include "AUD_Buffer.h"
#include <cstring>
AUD_ReverseReader::AUD_ReverseReader(AUD_IReader* reader) :
AUD_EffectReader(reader)
{
if(reader->getType() != AUD_TYPE_BUFFER)
AUD_THROW(AUD_ERROR_READER);
m_length = reader->getLength();
if(m_length < 0)
AUD_THROW(AUD_ERROR_READER);
m_position = 0;
m_buffer = new AUD_Buffer(); AUD_NEW("buffer")
}
AUD_ReverseReader::~AUD_ReverseReader()
{
delete m_buffer; AUD_DELETE("buffer")
}
void AUD_ReverseReader::seek(int position)
{
m_position = position;
}
int AUD_ReverseReader::getLength()
{
return m_length;
}
int AUD_ReverseReader::getPosition()
{
return m_position;
}
void AUD_ReverseReader::read(int & length, sample_t* & buffer)
{
// first correct the length
if(m_position+length > m_length)
length = m_length-m_position;
if(length <= 0)
{
length = 0;
return;
}
int samplesize = AUD_SAMPLE_SIZE(getSpecs());
// resize buffer if needed
if(m_buffer->getSize() < length * samplesize)
m_buffer->resize(length * samplesize);
buffer = m_buffer->getBuffer();
sample_t* buf;
int len = length;
// read from reader
m_reader->seek(m_length-m_position-len);
m_reader->read(len, buf);
// set null if reader didn't give enough data
if(len < length)
{
if(getSpecs().format == AUD_FORMAT_U8)
memset(buffer, 0x80, (length-len)*samplesize);
else
memset(buffer, 0, (length-len)*samplesize);
buffer += length-len;
}
// copy the samples reverted
for(int i = 0; i < len; i++)
memcpy(buffer + i * samplesize,
buf + (len - 1 - i) * samplesize,
samplesize);
m_position += length;
buffer = m_buffer->getBuffer();
}
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