blender/intern/audaspace/SRC/AUD_SRCResampleReader.cpp

151 lines
3.4 KiB
C++
Raw Normal View History

/*
* ***** BEGIN GPL LICENSE BLOCK *****
*
* Copyright 2009-2011 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 General Public License as published by
* the Free Software Foundation; either version 2 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Audaspace; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* ***** END GPL LICENSE BLOCK *****
*/
2011-02-25 10:21:56 +00:00
/** \file audaspace/SRC/AUD_SRCResampleReader.cpp
* \ingroup audsrc
*/
#include "AUD_SRCResampleReader.h"
#include <cmath>
#include <cstring>
#include <cstdio>
static long src_callback(void *cb_data, float **data)
{
return ((AUD_SRCResampleReader*)cb_data)->doCallback(data);
}
static const char* state_error = "AUD_SRCResampleReader: SRC State couldn't be "
"created.";
AUD_SRCResampleReader::AUD_SRCResampleReader(AUD_Reference<AUD_IReader> reader,
AUD_Specs specs) :
AUD_ResampleReader(reader, specs.rate),
m_channels(reader->getSpecs().channels),
m_position(0)
{
int error;
m_src = src_callback_new(src_callback,
SRC_SINC_MEDIUM_QUALITY,
m_channels,
&error,
this);
if(!m_src)
{
// XXX printf("%s\n", src_strerror(error));
AUD_THROW(AUD_ERROR_SRC, state_error);
}
}
AUD_SRCResampleReader::~AUD_SRCResampleReader()
{
src_delete(m_src);
}
long AUD_SRCResampleReader::doCallback(float** data)
{
AUD_Specs specs;
specs.channels = m_channels;
specs.rate = m_rate;
int length = m_buffer.getSize() / AUD_SAMPLE_SIZE(specs);
*data = m_buffer.getBuffer();
2011-06-21 20:14:53 +00:00
m_reader->read(length, m_eos, *data);
return length;
}
void AUD_SRCResampleReader::seek(int position)
{
AUD_Specs specs = m_reader->getSpecs();
double factor = double(m_rate) / double(specs.rate);
m_reader->seek(position / factor);
src_reset(m_src);
m_position = position;
}
int AUD_SRCResampleReader::getLength() const
{
AUD_Specs specs = m_reader->getSpecs();
double factor = double(m_rate) / double(specs.rate);
return m_reader->getLength() * factor;
}
int AUD_SRCResampleReader::getPosition() const
{
return m_position;
}
AUD_Specs AUD_SRCResampleReader::getSpecs() const
{
AUD_Specs specs = m_reader->getSpecs();
specs.rate = m_rate;
return specs;
}
2011-06-21 20:14:53 +00:00
void AUD_SRCResampleReader::read(int& length, bool& eos, sample_t* buffer)
{
AUD_Specs specs = m_reader->getSpecs();
double factor = double(m_rate) / double(specs.rate);
specs.rate = m_rate;
2011-06-21 20:14:53 +00:00
int size = length;
m_buffer.assureSize(length * AUD_SAMPLE_SIZE(specs));
if(specs.channels != m_channels)
{
src_delete(m_src);
m_channels = specs.channels;
int error;
m_src = src_callback_new(src_callback,
SRC_SINC_MEDIUM_QUALITY,
m_channels,
&error,
this);
if(!m_src)
{
// XXX printf("%s\n", src_strerror(error));
AUD_THROW(AUD_ERROR_SRC, state_error);
}
}
2011-06-21 20:14:53 +00:00
m_eos = false;
length = src_callback_read(m_src, factor, length, buffer);
m_position += length;
2011-06-21 20:14:53 +00:00
eos = m_eos && (length < size);
}