mirror of
https://github.com/libretro/scummvm.git
synced 2025-01-10 03:40:25 +00:00
127 lines
4.4 KiB
C++
127 lines
4.4 KiB
C++
/* 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 <cstddef>
|
|
|
|
#include "SampleRateConverter.h"
|
|
|
|
#if MT32EMU_WITH_LIBSOXR_RESAMPLER
|
|
#include "srchelper/SoxrAdapter.h"
|
|
#elif MT32EMU_WITH_LIBSAMPLERATE_RESAMPLER
|
|
#include "srchelper/SamplerateAdapter.h"
|
|
#elif MT32EMU_WITH_INTERNAL_RESAMPLER
|
|
#include "srchelper/InternalResampler.h"
|
|
#endif
|
|
|
|
#include "Synth.h"
|
|
|
|
using namespace MT32Emu;
|
|
|
|
static inline void *createDelegate(Synth &synth, double targetSampleRate, SamplerateConversionQuality quality) {
|
|
#if MT32EMU_WITH_LIBSOXR_RESAMPLER
|
|
return new SoxrAdapter(synth, targetSampleRate, quality);
|
|
#elif MT32EMU_WITH_LIBSAMPLERATE_RESAMPLER
|
|
return new SamplerateAdapter(synth, targetSampleRate, quality);
|
|
#elif MT32EMU_WITH_INTERNAL_RESAMPLER
|
|
return new InternalResampler(synth, targetSampleRate, quality);
|
|
#else
|
|
(void)synth, (void)targetSampleRate, (void)quality;
|
|
return NULL;
|
|
#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;
|
|
}
|
|
|
|
double SampleRateConverter::getSupportedOutputSampleRate(double desiredSampleRate) {
|
|
#if MT32EMU_WITH_LIBSOXR_RESAMPLER || MT32EMU_WITH_LIBSAMPLERATE_RESAMPLER || MT32EMU_WITH_INTERNAL_RESAMPLER
|
|
return desiredSampleRate > 0 ? desiredSampleRate : 0;
|
|
#else
|
|
(void)desiredSampleRate;
|
|
return 0;
|
|
#endif
|
|
}
|
|
|
|
SampleRateConverter::SampleRateConverter(Synth &useSynth, double targetSampleRate, SamplerateConversionQuality useQuality) :
|
|
synthInternalToTargetSampleRateRatio(SAMPLE_RATE / targetSampleRate),
|
|
useSynthDelegate(useSynth.getStereoOutputSampleRate() == targetSampleRate),
|
|
srcDelegate(useSynthDelegate ? &useSynth : createDelegate(useSynth, targetSampleRate, useQuality))
|
|
{}
|
|
|
|
SampleRateConverter::~SampleRateConverter() {
|
|
if (!useSynthDelegate) {
|
|
#if MT32EMU_WITH_LIBSOXR_RESAMPLER
|
|
delete static_cast<SoxrAdapter *>(srcDelegate);
|
|
#elif MT32EMU_WITH_LIBSAMPLERATE_RESAMPLER
|
|
delete static_cast<SamplerateAdapter *>(srcDelegate);
|
|
#elif MT32EMU_WITH_INTERNAL_RESAMPLER
|
|
delete static_cast<InternalResampler *>(srcDelegate);
|
|
#endif
|
|
}
|
|
}
|
|
|
|
void SampleRateConverter::getOutputSamples(float *buffer, unsigned int length) {
|
|
if (useSynthDelegate) {
|
|
static_cast<Synth *>(srcDelegate)->render(buffer, length);
|
|
return;
|
|
}
|
|
|
|
#if MT32EMU_WITH_LIBSOXR_RESAMPLER
|
|
static_cast<SoxrAdapter *>(srcDelegate)->getOutputSamples(buffer, length);
|
|
#elif MT32EMU_WITH_LIBSAMPLERATE_RESAMPLER
|
|
static_cast<SamplerateAdapter *>(srcDelegate)->getOutputSamples(buffer, length);
|
|
#elif MT32EMU_WITH_INTERNAL_RESAMPLER
|
|
static_cast<InternalResampler *>(srcDelegate)->getOutputSamples(buffer, length);
|
|
#else
|
|
Synth::muteSampleBuffer(buffer, length);
|
|
#endif
|
|
}
|
|
|
|
void SampleRateConverter::getOutputSamples(Bit16s *outBuffer, unsigned int length) {
|
|
static const unsigned int CHANNEL_COUNT = 2;
|
|
|
|
if (useSynthDelegate) {
|
|
static_cast<Synth *>(srcDelegate)->render(outBuffer, length);
|
|
return;
|
|
}
|
|
|
|
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;
|
|
}
|