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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_SRCResampleReader.h"
#include "AUD_Buffer.h"
#include <math.h>
#include <cstring>
#include <stdio.h>
static long src_callback(void *cb_data, float **data)
{
return ((AUD_SRCResampleReader*)cb_data)->doCallback(data);
}
AUD_SRCResampleReader::AUD_SRCResampleReader(AUD_IReader* reader,
AUD_Specs specs) :
AUD_EffectReader(reader)
{
m_sspecs = reader->getSpecs();
if(m_sspecs.format != AUD_FORMAT_FLOAT32)
{
delete m_reader; AUD_DELETE("reader")
AUD_THROW(AUD_ERROR_READER);
}
m_tspecs = specs;
m_tspecs.channels = m_sspecs.channels;
m_tspecs.format = m_sspecs.format;
m_factor = (double)m_tspecs.rate / (double)m_sspecs.rate;
int error;
m_src = src_callback_new(src_callback,
SRC_SINC_MEDIUM_QUALITY,
m_sspecs.channels,
&error,
this);
if(!m_src)
{
// XXX printf("%s\n", src_strerror(error));
delete m_reader; AUD_DELETE("reader")
AUD_THROW(AUD_ERROR_READER);
}
m_buffer = new AUD_Buffer(); AUD_NEW("buffer")
}
AUD_SRCResampleReader::~AUD_SRCResampleReader()
{
delete m_buffer; AUD_DELETE("buffer")
src_delete(m_src);
}
long AUD_SRCResampleReader::doCallback(float** data)
{
int length = m_buffer->getSize() / 4 / m_tspecs.channels;
sample_t* buffer;
m_reader->read(length, buffer);
*data = (float*)buffer;
return length;
}
void AUD_SRCResampleReader::seek(int position)
{
m_reader->seek(position / m_factor);
src_reset(m_src);
}
int AUD_SRCResampleReader::getLength()
{
return m_reader->getLength() * m_factor;
}
int AUD_SRCResampleReader::getPosition()
{
return m_reader->getPosition() * m_factor;
}
AUD_Specs AUD_SRCResampleReader::getSpecs()
{
return m_tspecs;
}
void AUD_SRCResampleReader::read(int & length, sample_t* & buffer)
{
if(m_buffer->getSize() < length * m_tspecs.channels * 4)
m_buffer->resize(length * m_tspecs.channels * 4);
buffer = m_buffer->getBuffer();
length = src_callback_read(m_src, m_factor, length, (float*)buffer);
}
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