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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 "SampleRateConverter.h"
#if MT32EMU_WITH_LIBSOXR_RESAMPLER
#include "srchelper/SoxrAdapter.h"
#elif MT32EMU_WITH_LIBSAMPLERATE_RESAMPLER
#include "srchelper/SamplerateAdapter.h"
#else
#include "srchelper/InternalResampler.h"
#endif
#include "Synth.h"
using namespace MT32Emu;
static inline void *createDelegate(Synth &synth, double targetSampleRate, SampleRateConverter::Quality quality) {
#if MT32EMU_WITH_LIBSOXR_RESAMPLER
return new SoxrAdapter(synth, targetSampleRate, quality);
#elif MT32EMU_WITH_LIBSAMPLERATE_RESAMPLER
return new SamplerateAdapter(synth, targetSampleRate, quality);
#else
return new InternalResampler(synth, targetSampleRate, quality);
#endif
}
AnalogOutputMode SampleRateConverter::getBestAnalogOutputMode(double targetSampleRate) {
if (Synth::getStereoOutputSampleRate(AnalogOutputMode_ACCURATE) < targetSampleRate) {
return AnalogOutputMode_OVERSAMPLED;
} else if (Synth::getStereoOutputSampleRate(AnalogOutputMode_COARSE) < targetSampleRate) {
return AnalogOutputMode_ACCURATE;
}
return AnalogOutputMode_COARSE;
}
SampleRateConverter::SampleRateConverter(Synth &useSynth, double targetSampleRate, Quality useQuality) :
synthInternalToTargetSampleRateRatio(SAMPLE_RATE / targetSampleRate),
srcDelegate(createDelegate(useSynth, targetSampleRate, useQuality))
{}
SampleRateConverter::~SampleRateConverter() {
#if MT32EMU_WITH_LIBSOXR_RESAMPLER
delete static_cast<SoxrAdapter *>(srcDelegate);
#elif MT32EMU_WITH_LIBSAMPLERATE_RESAMPLER
delete static_cast<SamplerateAdapter *>(srcDelegate);
#else
delete static_cast<InternalResampler *>(srcDelegate);
#endif
}
void SampleRateConverter::getOutputSamples(float *buffer, unsigned int length) {
#if MT32EMU_WITH_LIBSOXR_RESAMPLER
static_cast<SoxrAdapter *>(srcDelegate)->getOutputSamples(buffer, length);
#elif MT32EMU_WITH_LIBSAMPLERATE_RESAMPLER
static_cast<SamplerateAdapter *>(srcDelegate)->getOutputSamples(buffer, length);
#else
static_cast<InternalResampler *>(srcDelegate)->getOutputSamples(buffer, length);
#endif
}
void SampleRateConverter::getOutputSamples(Bit16s *outBuffer, unsigned int length) {
static const unsigned int CHANNEL_COUNT = 2;
float floatBuffer[CHANNEL_COUNT * MAX_SAMPLES_PER_RUN];
while (length > 0) {
const unsigned int size = MAX_SAMPLES_PER_RUN < length ? MAX_SAMPLES_PER_RUN : length;
getOutputSamples(floatBuffer, size);
float *outs = floatBuffer;
float *ends = floatBuffer + CHANNEL_COUNT * size;
while (outs < ends) {
*(outBuffer++) = Synth::convertSample(*(outs++));
}
length -= size;
}
}
double SampleRateConverter::convertOutputToSynthTimestamp(double outputTimestamp) const {
return outputTimestamp * synthInternalToTargetSampleRateRatio;
}
double SampleRateConverter::convertSynthToOutputTimestamp(double synthTimestamp) const {
return synthTimestamp / synthInternalToTargetSampleRateRatio;
}
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