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/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
/*
Rubber Band
An audio time-stretching and pitch-shifting library.
Copyright 2007-2008 Chris Cannam.
This program 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. See the file
COPYING included with this distribution for more information.
*/
#include "Resampler.h"
#include "Profiler.h"
#include <cstdlib>
#include <cmath>
#include <iostream>
#include <samplerate.h>
namespace RubberBand {
class ResamplerImpl
{
public:
virtual ~ResamplerImpl() { }
virtual int resample(const float *const R__ *const R__ in,
float *const R__ *const R__ out,
int incount,
float ratio,
bool final) = 0;
virtual void reset() = 0;
};
namespace Resamplers {
class D_SRC : public ResamplerImpl
{
public:
D_SRC(Resampler::Quality quality, int channels, int maxBufferSize,
int m_debugLevel);
~D_SRC();
int resample(const float *const R__ *const R__ in,
float *const R__ *const R__ out,
int incount,
float ratio,
bool final);
void reset();
protected:
SRC_STATE *m_src;
float *m_iin;
float *m_iout;
float m_lastRatio;
int m_channels;
int m_iinsize;
int m_ioutsize;
int m_debugLevel;
};
D_SRC::D_SRC(Resampler::Quality quality, int channels, int maxBufferSize,
int debugLevel) :
m_src(0),
m_iin(0),
m_iout(0),
m_lastRatio(1.f),
m_channels(channels),
m_iinsize(0),
m_ioutsize(0),
m_debugLevel(debugLevel)
{
if (m_debugLevel > 0) {
std::cerr << "Resampler::Resampler: using libsamplerate implementation"
<< std::endl;
}
int err = 0;
m_src = src_new(quality == Resampler::Best ? SRC_SINC_BEST_QUALITY :
quality == Resampler::Fastest ? SRC_LINEAR :
SRC_SINC_FASTEST,
channels, &err);
if (err) {
std::cerr << "Resampler::Resampler: failed to create libsamplerate resampler: "
<< src_strerror(err) << std::endl;
throw Resampler::ImplementationError; //!!! of course, need to catch this!
}
if (maxBufferSize > 0 && m_channels > 1) {
m_iinsize = maxBufferSize * m_channels;
m_ioutsize = maxBufferSize * m_channels * 2;
m_iin = allocFloat(m_iinsize);
m_iout = allocFloat(m_ioutsize);
}
reset();
}
D_SRC::~D_SRC()
{
src_delete(m_src);
if (m_iinsize > 0) {
free(m_iin);
}
if (m_ioutsize > 0) {
free(m_iout);
}
}
int
D_SRC::resample(const float *const R__ *const R__ in,
float *const R__ *const R__ out,
int incount,
float ratio,
bool final)
{
SRC_DATA data;
int outcount = lrintf(ceilf(incount * ratio));
if (m_channels == 1) {
data.data_in = const_cast<float *>(*in); //!!!???
data.data_out = *out;
} else {
if (incount * m_channels > m_iinsize) {
m_iin = allocFloat(m_iin, m_iinsize);
}
if (outcount * m_channels > m_ioutsize) {
m_iout = allocFloat(m_iout, m_ioutsize);
}
for (int i = 0; i < incount; ++i) {
for (int c = 0; c < m_channels; ++c) {
m_iin[i * m_channels + c] = in[c][i];
}
}
data.data_in = m_iin;
data.data_out = m_iout;
}
data.input_frames = incount;
data.output_frames = outcount;
data.src_ratio = ratio;
data.end_of_input = (final ? 1 : 0);
int err = 0;
err = src_process(m_src, &data);
if (err) {
std::cerr << "Resampler::process: libsamplerate error: "
<< src_strerror(err) << std::endl;
throw Resampler::ImplementationError; //!!! of course, need to catch this!
}
if (m_channels > 1) {
for (int i = 0; i < data.output_frames_gen; ++i) {
for (int c = 0; c < m_channels; ++c) {
out[c][i] = m_iout[i * m_channels + c];
}
}
}
m_lastRatio = ratio;
return data.output_frames_gen;
}
void
D_SRC::reset()
{
src_reset(m_src);
}
} /* end namespace Resamplers */
Resampler::Resampler(Resampler::Quality quality, int channels,
int maxBufferSize, int debugLevel)
{
m_method = -1;
switch (quality) {
case Resampler::Best:
m_method = 1;
break;
case Resampler::FastestTolerable:
m_method = 1;
break;
case Resampler::Fastest:
m_method = 1;
break;
}
if (m_method == -1) {
std::cerr << "Resampler::Resampler(" << quality << ", " << channels
<< ", " << maxBufferSize << "): No implementation available!"
<< std::endl;
abort();
}
switch (m_method) {
case 0:
std::cerr << "Resampler::Resampler(" << quality << ", " << channels
<< ", " << maxBufferSize << "): No implementation available!"
<< std::endl;
abort();
break;
case 1:
d = new Resamplers::D_SRC(quality, channels, maxBufferSize, debugLevel);
break;
case 2:
std::cerr << "Resampler::Resampler(" << quality << ", " << channels
<< ", " << maxBufferSize << "): No implementation available!"
<< std::endl;
abort();
break;
}
}
Resampler::~Resampler()
{
delete d;
}
int
Resampler::resample(const float *const R__ *const R__ in,
float *const R__ *const R__ out,
int incount, float ratio, bool final)
{
Profiler profiler("Resampler::resample");
return d->resample(in, out, incount, ratio, final);
}
void
Resampler::reset()
{
d->reset();
}
}
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