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