mirror of
https://github.com/cookiengineer/audacity
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103 lines
2.9 KiB
C++
103 lines
2.9 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 <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 = (void *)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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soxr_delete((soxr_t)mHandle);
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mHandle = NULL;
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}
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int Resample::GetNumMethods() { return 4; }
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wxString Resample::GetMethodName(int index)
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{
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static char const * const soxr_method_names[] = {
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"Low Quality (Fastest)", "Medium Quality", "High Quality", "Best Quality (Slowest)"
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};
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return wxString(wxString::FromAscii(soxr_method_names[index]));
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}
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const wxString Resample::GetFastMethodKey()
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{
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return wxT("/Quality/LibsoxrSampleRateConverter");
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}
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const wxString Resample::GetBestMethodKey()
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{
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return wxT("/Quality/LibsoxrHQSampleRateConverter");
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}
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int Resample::GetFastMethodDefault() {return 1;}
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int Resample::GetBestMethodDefault() {return 3;}
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int Resample::Process(double factor,
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float *inBuffer,
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int inBufferLen,
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bool lastFlag,
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int *inBufferUsed,
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float *outBuffer,
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int 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((soxr_t)mHandle,
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inBuffer , (size_t)(lastFlag? ~inBufferLen : inBufferLen), &idone,
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outBuffer, (size_t) outBufferLen, &odone);
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}
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else
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{
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soxr_set_io_ratio((soxr_t)mHandle, 1/factor, 0);
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inBufferLen = lastFlag? ~inBufferLen : inBufferLen;
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soxr_process((soxr_t)mHandle,
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inBuffer , (size_t)inBufferLen , &idone,
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outBuffer, (size_t)outBufferLen, &odone);
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}
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*inBufferUsed = (int)idone;
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return (int)odone;
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}
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