121 lines
3.3 KiB
C++
121 lines
3.3 KiB
C++
/**********************************************************************
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Audacity: A Digital Audio Editor
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Audacity(R) is copyright (c) 1999-2012 Audacity Team.
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License: GPL v2. See License.txt.
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Resample.cpp
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Dominic Mazzoni, Rob Sykes, Vaughan Johnson
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******************************************************************//**
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\class Resample
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\brief Interface to libsoxr.
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This class abstracts the interface to different resampling libraries:
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libsoxr, written by Rob Sykes. LGPL.
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Since Audacity always does resampling on mono streams that are
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contiguous in memory, this class doesn't support multiple channels
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or some of the other optional features of some of these resamplers.
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*//*******************************************************************/
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#include "Resample.h"
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#include "Prefs.h"
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#include "Internat.h"
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#include "../include/audacity/ComponentInterface.h"
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#include <soxr.h>
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Resample::Resample(const bool useBestMethod, const double dMinFactor, const double dMaxFactor)
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{
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this->SetMethod(useBestMethod);
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soxr_quality_spec_t q_spec;
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if (dMinFactor == dMaxFactor)
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{
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mbWantConstRateResampling = true; // constant rate resampling
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q_spec = soxr_quality_spec("\0\1\4\6"[mMethod], 0);
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}
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else
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{
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mbWantConstRateResampling = false; // variable rate resampling
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q_spec = soxr_quality_spec(SOXR_HQ, SOXR_VR);
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}
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mHandle.reset(soxr_create(1, dMinFactor, 1, 0, 0, &q_spec, 0));
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}
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Resample::~Resample()
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{
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}
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//////////
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static const std::initializer_list<EnumValueSymbol> methodNames{
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{ wxT("LowQuality"), XO("Low Quality (Fastest)") },
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{ wxT("MediumQuality"), XO("Medium Quality") },
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{ wxT("HighQuality"), XO("High Quality") },
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{ wxT("BestQuality"), XO("Best Quality (Slowest)") }
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};
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static auto intChoicesMethod = {
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0, 1, 2, 3
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};
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EnumSetting< int > Resample::FastMethodSetting{
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wxT("/Quality/LibsoxrSampleRateConverterChoice"),
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methodNames,
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1, // Medium Quality
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// for migrating old preferences:
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intChoicesMethod,
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wxT("/Quality/LibsoxrSampleRateConverter")
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};
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EnumSetting< int > Resample::BestMethodSetting
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{
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wxT("/Quality/LibsoxrHQSampleRateConverterChoice"),
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methodNames,
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3, // Best Quality,
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// for migrating old preferences:
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intChoicesMethod,
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wxT("/Quality/LibsoxrHQSampleRateConverter")
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};
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//////////
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std::pair<size_t, size_t>
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Resample::Process(double factor,
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float *inBuffer,
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size_t inBufferLen,
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bool lastFlag,
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float *outBuffer,
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size_t outBufferLen)
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{
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size_t idone, odone;
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if (mbWantConstRateResampling)
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{
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soxr_process(mHandle.get(),
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inBuffer , (lastFlag? ~inBufferLen : inBufferLen), &idone,
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outBuffer, outBufferLen, &odone);
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}
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else
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{
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soxr_set_io_ratio(mHandle.get(), 1/factor, 0);
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inBufferLen = lastFlag? ~inBufferLen : inBufferLen;
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soxr_process(mHandle.get(),
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inBuffer , inBufferLen , &idone,
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outBuffer, outBufferLen, &odone);
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}
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return { idone, odone };
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}
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void Resample::SetMethod(const bool useBestMethod)
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{
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if (useBestMethod)
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mMethod = BestMethodSetting.ReadEnum();
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else
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mMethod = FastMethodSetting.ReadEnum();
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}
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