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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/***************************************************************************
* chresampler.cc
*
* Tue Sep 23 20:42:14 CEST 2014
* Copyright 2014 Bent Bisballe Nyeng
* deva@aasimon.org
****************************************************************************/
/*
* This file is part of DrumGizmo.
*
* DrumGizmo 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.
*
* DrumGizmo 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 DrumGizmo; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include "chresampler.h"
#include <config.h>
#include <hugin.hpp>
#include <stdio.h>
#ifdef WITH_RESAMPLER
#if defined(USE_ZITA)
#include <zita-resampler/resampler.h>
#elif defined(USE_SRC)
#include <samplerate.h>
#else
#error "No resampler selected"
#endif
class CHResampler::Prv {
public:
#if defined(USE_ZITA)
Resampler zita;
#elif defined(USE_SRC)
SRC_STATE *state;
SRC_DATA data;
#endif
};
CHResampler::CHResampler()
{
input_fs = 44100;
output_fs = 44100;
prv = new Prv();
#if defined(SRC)
prv->state = NULL;
#endif
}
void CHResampler::setup(double input_fs, double output_fs)
{
int nchan = 1; // always mono
this->input_fs = input_fs;
this->output_fs = output_fs;
#if defined(USE_ZITA)
DEBUG(resampler, "Using zita-resampler (%d -> %d)", (int)input_fs, (int)output_fs);
int hlen = 72; // 16 ≤ hlen ≤ 96
// delay is 2 * hlen, 72 corresponds to delay introduced by SRC.
prv->zita.setup(input_fs, output_fs, nchan, hlen);
#elif defined(USE_SRC)
DEBUG(resampler, "Using libsamplerate (%d -> %d)", (int)input_fs, (int)output_fs);
int err;
prv->state = src_new(SRC_SINC_BEST_QUALITY, nchan, &err);
(void)err;
// printf("err: %d\n", err);
src_set_ratio(prv->state, output_fs / input_fs);
prv->data.src_ratio = output_fs / input_fs;
prv->data.end_of_input = 0;
#endif
}
CHResampler::~CHResampler()
{
#if defined(USE_ZITA)
#elif defined(USE_SRC)
if(prv->state) src_delete(prv->state);
#endif
delete prv;
}
void CHResampler::setInputSamples(float *samples, size_t count)
{
#if defined(USE_ZITA)
prv->zita.inp_data = samples;
prv->zita.inp_count = count;
#elif defined(USE_SRC)
prv->data.data_in = samples;
prv->data.input_frames = count;
#endif
}
void CHResampler::setOutputSamples(float *samples, size_t count)
{
#if defined(USE_ZITA)
prv->zita.out_data = samples;
prv->zita.out_count = count;
#elif defined(USE_SRC)
prv->data.data_out = samples;
prv->data.output_frames = count;
#endif
}
void CHResampler::process()
{
#if defined(USE_ZITA)
prv->zita.process();
#elif defined(USE_SRC)
src_process(prv->state, &prv->data);
prv->data.output_frames -= prv->data.output_frames_gen;
prv->data.data_out += prv->data.output_frames_gen;
prv->data.input_frames -= prv->data.input_frames_used;
prv->data.data_in += prv->data.input_frames_used;
#endif
}
size_t CHResampler::getInputSampleCount()
{
#if defined(USE_ZITA)
return prv->zita.inp_count;
#elif defined(USE_SRC)
return prv->data.input_frames;
#endif
}
size_t CHResampler::getOutputSampleCount()
{
#if defined(USE_ZITA)
return prv->zita.out_count;
#elif defined(USE_SRC)
return prv->data.output_frames;
#endif
}
double CHResampler::ratio()
{
return input_fs / output_fs;
}
#else
// Dummy implementation
CHResampler::CHResampler() {}
CHResampler::~CHResampler() {}
void CHResampler::setup(double, double) {}
void CHResampler::setInputSamples(float *, size_t) {}
void CHResampler::setOutputSamples(float *, size_t) {}
void CHResampler::process() {}
size_t CHResampler::getInputSampleCount() { return 0; }
size_t CHResampler::getOutputSampleCount() { return 0; }
double CHResampler::ratio() { return 1; }
#endif/*WITH_RESAMPLER*/
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