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author | Willem Jan Palenstijn | 2017-02-27 12:32:06 +0100 |
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committer | Willem Jan Palenstijn | 2017-02-28 18:40:04 +0100 |
commit | 867511d2d0a5d063e37b07115b8b98f5930d415b (patch) | |
tree | 2fd96da5f26b8320b8c3524a2acb20f37c59e61c /audio/softsynth/mt32/srchelper/srctools/src/ResamplerModel.cpp | |
parent | e2a72393d298a5c338e55b73ae910c9ef4e1b45e (diff) | |
download | scummvm-rg350-867511d2d0a5d063e37b07115b8b98f5930d415b.tar.gz scummvm-rg350-867511d2d0a5d063e37b07115b8b98f5930d415b.tar.bz2 scummvm-rg350-867511d2d0a5d063e37b07115b8b98f5930d415b.zip |
MT32: Update Munt to 2.0.3
This update uses upstream commit
777c51cdb4dbb4e02a53c23edea9086f0b600e26.
The new SampleRateConverter is added, but not built as we don't use it.
Also, building it without source changes will need additional include
directories.
This update of Munt reduces the stack size, and thus fixes bug #9630.
Diffstat (limited to 'audio/softsynth/mt32/srchelper/srctools/src/ResamplerModel.cpp')
-rw-r--r-- | audio/softsynth/mt32/srchelper/srctools/src/ResamplerModel.cpp | 153 |
1 files changed, 153 insertions, 0 deletions
diff --git a/audio/softsynth/mt32/srchelper/srctools/src/ResamplerModel.cpp b/audio/softsynth/mt32/srchelper/srctools/src/ResamplerModel.cpp new file mode 100644 index 0000000000..4d2d930837 --- /dev/null +++ b/audio/softsynth/mt32/srchelper/srctools/src/ResamplerModel.cpp @@ -0,0 +1,153 @@ +/* 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 <cmath> +#include <cstddef> + +#include "ResamplerModel.h" + +#include "ResamplerStage.h" +#include "SincResampler.h" +#include "IIR2xResampler.h" +#include "LinearResampler.h" + +namespace SRCTools { + +namespace ResamplerModel { + +static const unsigned int CHANNEL_COUNT = 2; +static const unsigned int MAX_SAMPLES_PER_RUN = 4096; + +class CascadeStage : public FloatSampleProvider { +friend void freeResamplerModel(FloatSampleProvider &model, FloatSampleProvider &source); +public: + CascadeStage(FloatSampleProvider &source, ResamplerStage &resamplerStage); + + void getOutputSamples(FloatSample *outBuffer, unsigned int size); + +protected: + ResamplerStage &resamplerStage; + +private: + FloatSampleProvider &source; + FloatSample buffer[CHANNEL_COUNT * MAX_SAMPLES_PER_RUN]; + const FloatSample *bufferPtr; + unsigned int size; +}; + +class InternalResamplerCascadeStage : public CascadeStage { +public: + InternalResamplerCascadeStage(FloatSampleProvider &useSource, ResamplerStage &useResamplerStage) : + CascadeStage(useSource, useResamplerStage) + {} + + ~InternalResamplerCascadeStage() { + delete &resamplerStage; + } +}; + +} // namespace ResamplerModel + +} // namespace SRCTools + +using namespace SRCTools; + +FloatSampleProvider &ResamplerModel::createResamplerModel(FloatSampleProvider &source, double sourceSampleRate, double targetSampleRate, Quality quality) { + if (sourceSampleRate == targetSampleRate) { + return source; + } + if (quality == FASTEST) { + return *new InternalResamplerCascadeStage(source, *new LinearResampler(sourceSampleRate, targetSampleRate)); + } + const IIRResampler::Quality iirQuality = static_cast<IIRResampler::Quality>(quality); + const double iirPassbandFraction = IIRResampler::getPassbandFractionForQuality(iirQuality); + if (sourceSampleRate < targetSampleRate) { + ResamplerStage *iir2xInterpolator = new IIR2xInterpolator(iirQuality); + FloatSampleProvider &iir2xInterpolatorStage = *new InternalResamplerCascadeStage(source, *iir2xInterpolator); + + if (2.0 * sourceSampleRate == targetSampleRate) { + return iir2xInterpolatorStage; + } + + double passband = 0.5 * sourceSampleRate * iirPassbandFraction; + double stopband = 1.5 * sourceSampleRate; + ResamplerStage *sincResampler = SincResampler::createSincResampler(2.0 * sourceSampleRate, targetSampleRate, passband, stopband, DEFAULT_DB_SNR, DEFAULT_WINDOWED_SINC_MAX_UPSAMPLE_FACTOR); + return *new InternalResamplerCascadeStage(iir2xInterpolatorStage, *sincResampler); + } + + if (sourceSampleRate == 2.0 * targetSampleRate) { + ResamplerStage *iir2xDecimator = new IIR2xDecimator(iirQuality); + return *new InternalResamplerCascadeStage(source, *iir2xDecimator); + } + + double passband = 0.5 * targetSampleRate * iirPassbandFraction; + double stopband = 1.5 * targetSampleRate; + double sincOutSampleRate = 2.0 * targetSampleRate; + const unsigned int maxUpsampleFactor = static_cast<unsigned int>(ceil(DEFAULT_WINDOWED_SINC_MAX_DOWNSAMPLE_FACTOR * sincOutSampleRate / sourceSampleRate)); + ResamplerStage *sincResampler = SincResampler::createSincResampler(sourceSampleRate, sincOutSampleRate, passband, stopband, DEFAULT_DB_SNR, maxUpsampleFactor); + FloatSampleProvider &sincResamplerStage = *new InternalResamplerCascadeStage(source, *sincResampler); + + ResamplerStage *iir2xDecimator = new IIR2xDecimator(iirQuality); + return *new InternalResamplerCascadeStage(sincResamplerStage, *iir2xDecimator); +} + +FloatSampleProvider &ResamplerModel::createResamplerModel(FloatSampleProvider &source, ResamplerStage **resamplerStages, unsigned int stageCount) { + FloatSampleProvider *prevStage = &source; + for (unsigned int i = 0; i < stageCount; i++) { + prevStage = new CascadeStage(*prevStage, *(resamplerStages[i])); + } + return *prevStage; +} + +FloatSampleProvider &ResamplerModel::createResamplerModel(FloatSampleProvider &source, ResamplerStage &stage) { + return *new CascadeStage(source, stage); +} + +void ResamplerModel::freeResamplerModel(FloatSampleProvider &model, FloatSampleProvider &source) { + FloatSampleProvider *currentStage = &model; + while (currentStage != &source) { + CascadeStage *cascadeStage = dynamic_cast<CascadeStage *>(currentStage); + if (cascadeStage == NULL) return; + FloatSampleProvider &prevStage = cascadeStage->source; + delete currentStage; + currentStage = &prevStage; + } +} + +using namespace ResamplerModel; + +CascadeStage::CascadeStage(FloatSampleProvider &useSource, ResamplerStage &useResamplerStage) : + resamplerStage(useResamplerStage), + source(useSource), + bufferPtr(buffer), + size() +{} + +void CascadeStage::getOutputSamples(FloatSample *outBuffer, unsigned int length) { + while (length > 0) { + if (size == 0) { + size = resamplerStage.estimateInLength(length); + if (size < 1) { + size = 1; + } else if (MAX_SAMPLES_PER_RUN < size) { + size = MAX_SAMPLES_PER_RUN; + } + source.getOutputSamples(buffer, size); + bufferPtr = buffer; + } + resamplerStage.process(bufferPtr, size, outBuffer, length); + } +} |