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/* Copyright (C) 2015-2017 Sergey V. Mikayev
*
* This program 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 2.1 of the License, or
* (at your option) any later version.
*
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "SamplerateAdapter.h"
#include "../Synth.h"
using namespace MT32Emu;
static const unsigned int CHANNEL_COUNT = 2;
long SamplerateAdapter::getInputSamples(void *cb_data, float **data) {
SamplerateAdapter *instance = static_cast<SamplerateAdapter *>(cb_data);
unsigned int length = instance->inBufferSize < 1 ? 1 : (MAX_SAMPLES_PER_RUN < instance->inBufferSize ? MAX_SAMPLES_PER_RUN : instance->inBufferSize);
instance->synth.render(instance->inBuffer, length);
*data = instance->inBuffer;
instance->inBufferSize -= length;
return length;
}
SamplerateAdapter::SamplerateAdapter(Synth &useSynth, double targetSampleRate, SamplerateConversionQuality quality) :
synth(useSynth),
inBuffer(new float[CHANNEL_COUNT * MAX_SAMPLES_PER_RUN]),
inBufferSize(MAX_SAMPLES_PER_RUN),
inputToOutputRatio(useSynth.getStereoOutputSampleRate() / targetSampleRate),
outputToInputRatio(targetSampleRate / useSynth.getStereoOutputSampleRate())
{
int error;
int conversionType;
switch (quality) {
case SamplerateConversionQuality_FASTEST:
conversionType = SRC_LINEAR;
break;
case SamplerateConversionQuality_FAST:
conversionType = SRC_SINC_FASTEST;
break;
case SamplerateConversionQuality_BEST:
conversionType = SRC_SINC_BEST_QUALITY;
break;
case SamplerateConversionQuality_GOOD:
default:
conversionType = SRC_SINC_MEDIUM_QUALITY;
break;
};
resampler = src_callback_new(getInputSamples, conversionType, CHANNEL_COUNT, &error, this);
if (error != 0) {
synth.printDebug("SamplerateAdapter: Creation of Samplerate instance failed: %s\n", src_strerror(error));
src_delete(resampler);
resampler = NULL;
}
}
SamplerateAdapter::~SamplerateAdapter() {
delete[] inBuffer;
src_delete(resampler);
}
void SamplerateAdapter::getOutputSamples(float *buffer, unsigned int length) {
if (resampler == NULL) {
Synth::muteSampleBuffer(buffer, CHANNEL_COUNT * length);
return;
}
while (length > 0) {
inBufferSize = static_cast<unsigned int>(length * inputToOutputRatio + 0.5);
long gotFrames = src_callback_read(resampler, outputToInputRatio, long(length), buffer);
int error = src_error(resampler);
if (error != 0) {
synth.printDebug("SamplerateAdapter: Samplerate error during processing: %s > resetting\n", src_strerror(error));
error = src_reset(resampler);
if (error != 0) {
synth.printDebug("SamplerateAdapter: Samplerate failed to reset: %s\n", src_strerror(error));
src_delete(resampler);
resampler = NULL;
Synth::muteSampleBuffer(buffer, CHANNEL_COUNT * length);
synth.printDebug("SamplerateAdapter: Samplerate disabled\n");
return;
}
continue;
}
if (gotFrames <= 0) {
synth.printDebug("SamplerateAdapter: got %li frames from Samplerate, weird\n", gotFrames);
}
buffer += CHANNEL_COUNT * gotFrames;
length -= gotFrames;
}
}
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