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Updated SoundTouch library to 1.8.1 [r198]
This commit is contained in:
skidau
644
Externals/soundtouch/RateTransposer.cpp
vendored
644
Externals/soundtouch/RateTransposer.cpp
vendored
@ -10,10 +10,10 @@
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///
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////////////////////////////////////////////////////////////////////////////////
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//
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// Last changed : $Date: 2013-06-14 17:34:33 +0000 (Fri, 14 Jun 2013) $
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// Last changed : $Date: 2014-04-07 01:57:21 +1000 (Mon, 07 Apr 2014) $
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// File revision : $Revision: 4 $
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//
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// $Id: RateTransposer.cpp 172 2013-06-14 17:34:33Z oparviai $
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// $Id: RateTransposer.cpp 195 2014-04-06 15:57:21Z oparviai $
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//
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////////////////////////////////////////////////////////////////////////////////
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//
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@ -43,95 +43,25 @@
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#include <stdlib.h>
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#include <stdio.h>
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#include "RateTransposer.h"
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#include "InterpolateLinear.h"
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#include "InterpolateCubic.h"
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#include "InterpolateShannon.h"
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#include "AAFilter.h"
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using namespace soundtouch;
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/// A linear samplerate transposer class that uses integer arithmetics.
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/// for the transposing.
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class RateTransposerInteger : public RateTransposer
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{
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protected:
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int iSlopeCount;
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int iRate;
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SAMPLETYPE *sPrevSample;
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virtual void resetRegisters();
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virtual int transposeStereo(SAMPLETYPE *dest,
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const SAMPLETYPE *src,
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uint numSamples);
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virtual int transposeMono(SAMPLETYPE *dest,
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const SAMPLETYPE *src,
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uint numSamples);
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virtual int transposeMulti(SAMPLETYPE *dest, const SAMPLETYPE *src, uint numSamples);
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public:
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RateTransposerInteger();
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virtual ~RateTransposerInteger();
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/// Sets new target rate. Normal rate = 1.0, smaller values represent slower
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/// rate, larger faster rates.
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virtual void setRate(float newRate);
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};
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/// A linear samplerate transposer class that uses floating point arithmetics
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/// for the transposing.
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class RateTransposerFloat : public RateTransposer
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{
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protected:
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float fSlopeCount;
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SAMPLETYPE *sPrevSample;
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virtual void resetRegisters();
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virtual int transposeStereo(SAMPLETYPE *dest,
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const SAMPLETYPE *src,
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uint numSamples);
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virtual int transposeMono(SAMPLETYPE *dest,
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const SAMPLETYPE *src,
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uint numSamples);
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virtual int transposeMulti(SAMPLETYPE *dest, const SAMPLETYPE *src, uint nSamples);
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public:
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RateTransposerFloat();
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virtual ~RateTransposerFloat();
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};
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// Operator 'new' is overloaded so that it automatically creates a suitable instance
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// depending on if we've a MMX/SSE/etc-capable CPU available or not.
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void * RateTransposer::operator new(size_t s)
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{
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ST_THROW_RT_ERROR("Error in RateTransoser::new: don't use \"new TDStretch\" directly, use \"newInstance\" to create a new instance instead!");
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return newInstance();
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}
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RateTransposer *RateTransposer::newInstance()
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{
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#ifdef SOUNDTOUCH_INTEGER_SAMPLES
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return ::new RateTransposerInteger;
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#else
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return ::new RateTransposerFloat;
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#endif
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}
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// Define default interpolation algorithm here
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TransposerBase::ALGORITHM TransposerBase::algorithm = TransposerBase::CUBIC;
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// Constructor
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RateTransposer::RateTransposer() : FIFOProcessor(&outputBuffer)
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{
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numChannels = 2;
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bUseAAFilter = TRUE;
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fRate = 0;
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bUseAAFilter = true;
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// Instantiates the anti-alias filter with default tap length
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// of 32
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pAAFilter = new AAFilter(32);
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// Instantiates the anti-alias filter
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pAAFilter = new AAFilter(64);
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pTransposer = TransposerBase::newInstance();
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}
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@ -139,19 +69,20 @@ RateTransposer::RateTransposer() : FIFOProcessor(&outputBuffer)
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RateTransposer::~RateTransposer()
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{
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delete pAAFilter;
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delete pTransposer;
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}
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/// Enables/disables the anti-alias filter. Zero to disable, nonzero to enable
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void RateTransposer::enableAAFilter(BOOL newMode)
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void RateTransposer::enableAAFilter(bool newMode)
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{
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bUseAAFilter = newMode;
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}
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/// Returns nonzero if anti-alias filter is enabled.
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BOOL RateTransposer::isAAFilterEnabled() const
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bool RateTransposer::isAAFilterEnabled() const
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{
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return bUseAAFilter;
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}
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@ -170,7 +101,7 @@ void RateTransposer::setRate(float newRate)
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{
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double fCutoff;
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fRate = newRate;
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pTransposer->setRate(newRate);
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// design a new anti-alias filter
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if (newRate > 1.0f)
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@ -185,22 +116,6 @@ void RateTransposer::setRate(float newRate)
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}
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// Outputs as many samples of the 'outputBuffer' as possible, and if there's
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// any room left, outputs also as many of the incoming samples as possible.
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// The goal is to drive the outputBuffer empty.
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//
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// It's allowed for 'output' and 'input' parameters to point to the same
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// memory position.
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/*
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void RateTransposer::flushStoreBuffer()
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{
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if (storeBuffer.isEmpty()) return;
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outputBuffer.moveSamples(storeBuffer);
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}
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*/
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// Adds 'nSamples' pcs of samples from the 'samples' memory position into
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// the input of the object.
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void RateTransposer::putSamples(const SAMPLETYPE *samples, uint nSamples)
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@ -209,70 +124,6 @@ void RateTransposer::putSamples(const SAMPLETYPE *samples, uint nSamples)
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}
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// Transposes up the sample rate, causing the observed playback 'rate' of the
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// sound to decrease
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void RateTransposer::upsample(const SAMPLETYPE *src, uint nSamples)
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{
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uint count, sizeTemp, num;
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// If the parameter 'uRate' value is smaller than 'SCALE', first transpose
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// the samples and then apply the anti-alias filter to remove aliasing.
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// First check that there's enough room in 'storeBuffer'
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// (+16 is to reserve some slack in the destination buffer)
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sizeTemp = (uint)((float)nSamples / fRate + 16.0f);
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// Transpose the samples, store the result into the end of "storeBuffer"
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count = transpose(storeBuffer.ptrEnd(sizeTemp), src, nSamples);
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storeBuffer.putSamples(count);
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// Apply the anti-alias filter to samples in "store output", output the
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// result to "dest"
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num = storeBuffer.numSamples();
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count = pAAFilter->evaluate(outputBuffer.ptrEnd(num),
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storeBuffer.ptrBegin(), num, (uint)numChannels);
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outputBuffer.putSamples(count);
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// Remove the processed samples from "storeBuffer"
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storeBuffer.receiveSamples(count);
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}
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// Transposes down the sample rate, causing the observed playback 'rate' of the
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// sound to increase
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void RateTransposer::downsample(const SAMPLETYPE *src, uint nSamples)
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{
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uint count, sizeTemp;
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// If the parameter 'uRate' value is larger than 'SCALE', first apply the
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// anti-alias filter to remove high frequencies (prevent them from folding
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// over the lover frequencies), then transpose.
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// Add the new samples to the end of the storeBuffer
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storeBuffer.putSamples(src, nSamples);
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// Anti-alias filter the samples to prevent folding and output the filtered
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// data to tempBuffer. Note : because of the FIR filter length, the
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// filtering routine takes in 'filter_length' more samples than it outputs.
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assert(tempBuffer.isEmpty());
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sizeTemp = storeBuffer.numSamples();
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count = pAAFilter->evaluate(tempBuffer.ptrEnd(sizeTemp),
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storeBuffer.ptrBegin(), sizeTemp, (uint)numChannels);
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if (count == 0) return;
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// Remove the filtered samples from 'storeBuffer'
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storeBuffer.receiveSamples(count);
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// Transpose the samples (+16 is to reserve some slack in the destination buffer)
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sizeTemp = (uint)((float)nSamples / fRate + 16.0f);
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count = transpose(outputBuffer.ptrEnd(sizeTemp), tempBuffer.ptrBegin(), count);
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outputBuffer.putSamples(count);
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}
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// Transposes sample rate by applying anti-alias filter to prevent folding.
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// Returns amount of samples returned in the "dest" buffer.
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// The maximum amount of samples that can be returned at a time is set by
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@ -280,51 +131,45 @@ void RateTransposer::downsample(const SAMPLETYPE *src, uint nSamples)
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void RateTransposer::processSamples(const SAMPLETYPE *src, uint nSamples)
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{
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uint count;
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uint sizeReq;
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if (nSamples == 0) return;
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assert(pAAFilter);
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// Store samples to input buffer
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inputBuffer.putSamples(src, nSamples);
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// If anti-alias filter is turned off, simply transpose without applying
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// the filter
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if (bUseAAFilter == FALSE)
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if (bUseAAFilter == false)
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{
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sizeReq = (uint)((float)nSamples / fRate + 1.0f);
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count = transpose(outputBuffer.ptrEnd(sizeReq), src, nSamples);
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outputBuffer.putSamples(count);
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count = pTransposer->transpose(outputBuffer, inputBuffer);
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return;
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}
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assert(pAAFilter);
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// Transpose with anti-alias filter
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if (fRate < 1.0f)
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if (pTransposer->rate < 1.0f)
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{
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upsample(src, nSamples);
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// If the parameter 'Rate' value is smaller than 1, first transpose
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// the samples and then apply the anti-alias filter to remove aliasing.
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// Transpose the samples, store the result to end of "midBuffer"
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pTransposer->transpose(midBuffer, inputBuffer);
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// Apply the anti-alias filter for transposed samples in midBuffer
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pAAFilter->evaluate(outputBuffer, midBuffer);
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}
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else
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{
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downsample(src, nSamples);
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}
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}
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// If the parameter 'Rate' value is larger than 1, first apply the
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// anti-alias filter to remove high frequencies (prevent them from folding
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// over the lover frequencies), then transpose.
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// Apply the anti-alias filter for samples in inputBuffer
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pAAFilter->evaluate(midBuffer, inputBuffer);
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// Transposes the sample rate of the given samples using linear interpolation.
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// Returns the number of samples returned in the "dest" buffer
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inline int RateTransposer::transpose(SAMPLETYPE *dest, const SAMPLETYPE *src, uint nSamples)
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{
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#ifndef USE_MULTICH_ALWAYS
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if (numChannels == 1)
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{
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return transposeMono(dest, src, nSamples);
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}
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else if (numChannels == 2)
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{
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return transposeStereo(dest, src, nSamples);
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}
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else
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#endif // USE_MULTICH_ALWAYS
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{
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assert(numChannels > 0);
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return transposeMulti(dest, src, nSamples);
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// Transpose the AA-filtered samples in "midBuffer"
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pTransposer->transpose(outputBuffer, midBuffer);
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}
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}
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@ -333,17 +178,13 @@ inline int RateTransposer::transpose(SAMPLETYPE *dest, const SAMPLETYPE *src, ui
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void RateTransposer::setChannels(int nChannels)
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{
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assert(nChannels > 0);
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if (numChannels == nChannels) return;
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// assert(nChannels == 1 || nChannels == 2);
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numChannels = nChannels;
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if (pTransposer->numChannels == nChannels) return;
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pTransposer->setChannels(nChannels);
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storeBuffer.setChannels(numChannels);
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tempBuffer.setChannels(numChannels);
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outputBuffer.setChannels(numChannels);
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// Inits the linear interpolation registers
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resetRegisters();
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inputBuffer.setChannels(nChannels);
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midBuffer.setChannels(nChannels);
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outputBuffer.setChannels(nChannels);
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}
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@ -351,7 +192,8 @@ void RateTransposer::setChannels(int nChannels)
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void RateTransposer::clear()
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{
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outputBuffer.clear();
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storeBuffer.clear();
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midBuffer.clear();
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inputBuffer.clear();
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}
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@ -362,387 +204,99 @@ int RateTransposer::isEmpty() const
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res = FIFOProcessor::isEmpty();
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if (res == 0) return 0;
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return storeBuffer.isEmpty();
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return inputBuffer.isEmpty();
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}
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|
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|
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//////////////////////////////////////////////////////////////////////////////
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//
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// RateTransposerInteger - integer arithmetic implementation
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// TransposerBase - Base class for interpolation
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//
|
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|
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/// fixed-point interpolation routine precision
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#define SCALE 65536
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|
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// Constructor
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RateTransposerInteger::RateTransposerInteger() : RateTransposer()
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// static function to set interpolation algorithm
|
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void TransposerBase::setAlgorithm(TransposerBase::ALGORITHM a)
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{
|
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// Notice: use local function calling syntax for sake of clarity,
|
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// to indicate the fact that C++ constructor can't call virtual functions.
|
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sPrevSample=0;
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RateTransposerInteger::resetRegisters();
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RateTransposerInteger::setRate(1.0f);
|
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}
|
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|
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|
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RateTransposerInteger::~RateTransposerInteger()
|
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{
|
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if (sPrevSample) delete[] sPrevSample;
|
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}
|
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|
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|
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void RateTransposerInteger::resetRegisters()
|
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{
|
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iSlopeCount = 0;
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delete[] sPrevSample;
|
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sPrevSample = new SAMPLETYPE[numChannels];
|
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memset(sPrevSample, 0, numChannels * sizeof(SAMPLETYPE));
|
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}
|
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|
||||
|
||||
|
||||
// Transposes the sample rate of the given samples using linear interpolation.
|
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// 'Mono' version of the routine. Returns the number of samples returned in
|
||||
// the "dest" buffer
|
||||
int RateTransposerInteger::transposeMono(SAMPLETYPE *dest, const SAMPLETYPE *src, uint nSamples)
|
||||
{
|
||||
int i, remain;
|
||||
LONG_SAMPLETYPE temp, vol1;
|
||||
|
||||
if (nSamples == 0) return 0; // no samples, no work
|
||||
|
||||
remain = nSamples - 1;
|
||||
i = 0;
|
||||
|
||||
// Process the last sample saved from the previous call first...
|
||||
while (iSlopeCount <= SCALE)
|
||||
{
|
||||
vol1 = (LONG_SAMPLETYPE)(SCALE - iSlopeCount);
|
||||
temp = vol1 * sPrevSample[0] + iSlopeCount * src[0];
|
||||
dest[i] = (SAMPLETYPE)(temp / SCALE);
|
||||
i++;
|
||||
iSlopeCount += iRate;
|
||||
}
|
||||
// now always (iSlopeCount > SCALE)
|
||||
iSlopeCount -= SCALE;
|
||||
|
||||
while (1)
|
||||
{
|
||||
while (iSlopeCount > SCALE)
|
||||
{
|
||||
iSlopeCount -= SCALE;
|
||||
src ++;
|
||||
remain --;
|
||||
if (remain == 0) goto end;
|
||||
}
|
||||
vol1 = (LONG_SAMPLETYPE)(SCALE - iSlopeCount);
|
||||
temp = src[0] * vol1 + iSlopeCount * src[1];
|
||||
dest[i] = (SAMPLETYPE)(temp / SCALE);
|
||||
|
||||
i++;
|
||||
iSlopeCount += iRate;
|
||||
}
|
||||
end:
|
||||
// Store the last sample for the next round
|
||||
sPrevSample[0] = src[0];
|
||||
|
||||
return i;
|
||||
TransposerBase::algorithm = a;
|
||||
}
|
||||
|
||||
|
||||
// Transposes the sample rate of the given samples using linear interpolation.
|
||||
// 'Stereo' version of the routine. Returns the number of samples returned in
|
||||
// the "dest" buffer
|
||||
int RateTransposerInteger::transposeStereo(SAMPLETYPE *dest, const SAMPLETYPE *src, uint nSamples)
|
||||
// Returns the number of samples returned in the "dest" buffer
|
||||
int TransposerBase::transpose(FIFOSampleBuffer &dest, FIFOSampleBuffer &src)
|
||||
{
|
||||
int i, remain;
|
||||
LONG_SAMPLETYPE temp, vol1;
|
||||
int numSrcSamples = src.numSamples();
|
||||
int sizeDemand = (int)((float)numSrcSamples / rate) + 8;
|
||||
int numOutput;
|
||||
SAMPLETYPE *psrc = src.ptrBegin();
|
||||
SAMPLETYPE *pdest = dest.ptrEnd(sizeDemand);
|
||||
|
||||
if (nSamples == 0) return 0; // no samples, no work
|
||||
|
||||
remain = nSamples - 1;
|
||||
i = 0;
|
||||
|
||||
// Process the last sample saved from the sPrevSampleLious call first...
|
||||
while (iSlopeCount <= SCALE)
|
||||
#ifndef USE_MULTICH_ALWAYS
|
||||
if (numChannels == 1)
|
||||
{
|
||||
vol1 = (LONG_SAMPLETYPE)(SCALE - iSlopeCount);
|
||||
temp = vol1 * sPrevSample[0] + iSlopeCount * src[0];
|
||||
dest[2 * i] = (SAMPLETYPE)(temp / SCALE);
|
||||
temp = vol1 * sPrevSample[1] + iSlopeCount * src[1];
|
||||
dest[2 * i + 1] = (SAMPLETYPE)(temp / SCALE);
|
||||
i++;
|
||||
iSlopeCount += iRate;
|
||||
numOutput = transposeMono(pdest, psrc, numSrcSamples);
|
||||
}
|
||||
// now always (iSlopeCount > SCALE)
|
||||
iSlopeCount -= SCALE;
|
||||
|
||||
while (1)
|
||||
else if (numChannels == 2)
|
||||
{
|
||||
while (iSlopeCount > SCALE)
|
||||
{
|
||||
iSlopeCount -= SCALE;
|
||||
remain --;
|
||||
src += 2;
|
||||
if (remain == 0) goto end;
|
||||
}
|
||||
vol1 = (LONG_SAMPLETYPE)(SCALE - iSlopeCount);
|
||||
temp = src[0] * vol1 + iSlopeCount * src[2];
|
||||
dest[2 * i] = (SAMPLETYPE)(temp / SCALE);
|
||||
temp = src[1] * vol1 + iSlopeCount * src[3];
|
||||
dest[2 * i + 1] = (SAMPLETYPE)(temp / SCALE);
|
||||
|
||||
i++;
|
||||
iSlopeCount += iRate;
|
||||
numOutput = transposeStereo(pdest, psrc, numSrcSamples);
|
||||
}
|
||||
else
|
||||
#endif // USE_MULTICH_ALWAYS
|
||||
{
|
||||
assert(numChannels > 0);
|
||||
numOutput = transposeMulti(pdest, psrc, numSrcSamples);
|
||||
}
|
||||
end:
|
||||
// Store the last sample for the next round
|
||||
sPrevSample[0] = src[0];
|
||||
sPrevSample[1] = src[1];
|
||||
|
||||
return i;
|
||||
dest.putSamples(numOutput);
|
||||
src.receiveSamples(numSrcSamples);
|
||||
return numOutput;
|
||||
}
|
||||
|
||||
|
||||
int RateTransposerInteger::transposeMulti(SAMPLETYPE *dest, const SAMPLETYPE *src, uint nSamples)
|
||||
TransposerBase::TransposerBase()
|
||||
{
|
||||
int i, remaining;
|
||||
LONG_SAMPLETYPE temp, vol1;
|
||||
|
||||
if (nSamples == 0) return 0; // no samples, no work
|
||||
|
||||
remaining = nSamples - 1;
|
||||
i = 0;
|
||||
|
||||
// Process the last sample saved from the sPrevSampleLious call first...
|
||||
while (iSlopeCount <= SCALE)
|
||||
{
|
||||
for (int c = 0; c < numChannels; c ++)
|
||||
{
|
||||
vol1 = (SCALE - iSlopeCount);
|
||||
temp = vol1 * sPrevSample[c] + iSlopeCount * src[c];
|
||||
*dest = (SAMPLETYPE)(temp / SCALE);
|
||||
dest ++;
|
||||
}
|
||||
i++;
|
||||
|
||||
iSlopeCount += iRate;
|
||||
}
|
||||
// now always (iSlopeCount > SCALE)
|
||||
iSlopeCount -= SCALE;
|
||||
|
||||
while (1)
|
||||
{
|
||||
while (iSlopeCount > SCALE)
|
||||
{
|
||||
iSlopeCount -= SCALE;
|
||||
src += numChannels;
|
||||
remaining --;
|
||||
if (remaining == 0) goto end;
|
||||
}
|
||||
|
||||
for (int c = 0; c < numChannels; c ++)
|
||||
{
|
||||
vol1 = (SCALE - iSlopeCount);
|
||||
temp = src[c] * vol1 + iSlopeCount * src[c + numChannels];
|
||||
*dest = (SAMPLETYPE)(temp / SCALE);
|
||||
dest++;
|
||||
}
|
||||
|
||||
i++;
|
||||
iSlopeCount += iRate;
|
||||
}
|
||||
end:
|
||||
// Store the last sample for the next round
|
||||
memcpy(sPrevSample, src, numChannels * sizeof(SAMPLETYPE));
|
||||
|
||||
return i;
|
||||
}
|
||||
|
||||
// Sets new target iRate. Normal iRate = 1.0, smaller values represent slower
|
||||
// iRate, larger faster iRates.
|
||||
void RateTransposerInteger::setRate(float newRate)
|
||||
{
|
||||
iRate = (int)(newRate * SCALE + 0.5f);
|
||||
RateTransposer::setRate(newRate);
|
||||
numChannels = 0;
|
||||
rate = 1.0f;
|
||||
}
|
||||
|
||||
|
||||
//////////////////////////////////////////////////////////////////////////////
|
||||
//
|
||||
// RateTransposerFloat - floating point arithmetic implementation
|
||||
//
|
||||
//////////////////////////////////////////////////////////////////////////////
|
||||
|
||||
// Constructor
|
||||
RateTransposerFloat::RateTransposerFloat() : RateTransposer()
|
||||
TransposerBase::~TransposerBase()
|
||||
{
|
||||
// Notice: use local function calling syntax for sake of clarity,
|
||||
// to indicate the fact that C++ constructor can't call virtual functions.
|
||||
sPrevSample = NULL;
|
||||
RateTransposerFloat::resetRegisters();
|
||||
RateTransposerFloat::setRate(1.0f);
|
||||
}
|
||||
|
||||
|
||||
RateTransposerFloat::~RateTransposerFloat()
|
||||
void TransposerBase::setChannels(int channels)
|
||||
{
|
||||
delete[] sPrevSample;
|
||||
numChannels = channels;
|
||||
resetRegisters();
|
||||
}
|
||||
|
||||
|
||||
void RateTransposerFloat::resetRegisters()
|
||||
void TransposerBase::setRate(float newRate)
|
||||
{
|
||||
fSlopeCount = 0;
|
||||
delete[] sPrevSample;
|
||||
sPrevSample = new SAMPLETYPE[numChannels];
|
||||
memset(sPrevSample, 0, numChannels * sizeof(SAMPLETYPE));
|
||||
rate = newRate;
|
||||
}
|
||||
|
||||
|
||||
|
||||
// Transposes the sample rate of the given samples using linear interpolation.
|
||||
// 'Mono' version of the routine. Returns the number of samples returned in
|
||||
// the "dest" buffer
|
||||
int RateTransposerFloat::transposeMono(SAMPLETYPE *dest, const SAMPLETYPE *src, uint nSamples)
|
||||
// static factory function
|
||||
TransposerBase *TransposerBase::newInstance()
|
||||
{
|
||||
int i, remain;
|
||||
|
||||
remain = 0;
|
||||
i = 0;
|
||||
|
||||
// Process the last sample saved from the previous call first...
|
||||
while (fSlopeCount <= 1.0f)
|
||||
#ifdef SOUNDTOUCH_INTEGER_SAMPLES
|
||||
// Notice: For integer arithmetics support only linear algorithm (due to simplest calculus)
|
||||
return ::new InterpolateLinearInteger;
|
||||
#else
|
||||
switch (algorithm)
|
||||
{
|
||||
dest[i] = (SAMPLETYPE)((1.0f - fSlopeCount) * sPrevSample[0] + fSlopeCount * src[0]);
|
||||
i++;
|
||||
fSlopeCount += fRate;
|
||||
}
|
||||
fSlopeCount -= 1.0f;
|
||||
case LINEAR:
|
||||
return new InterpolateLinearFloat;
|
||||
|
||||
if (nSamples > 1)
|
||||
{
|
||||
while (1)
|
||||
{
|
||||
while (fSlopeCount > 1.0f)
|
||||
{
|
||||
fSlopeCount -= 1.0f;
|
||||
src ++;
|
||||
remain --;
|
||||
if (remain == 0) goto end;
|
||||
}
|
||||
dest[i] = (SAMPLETYPE)((1.0f - fSlopeCount) * src[0] + fSlopeCount * src[1]);
|
||||
i++;
|
||||
fSlopeCount += fRate;
|
||||
}
|
||||
}
|
||||
end:
|
||||
// Store the last sample for the next round
|
||||
sPrevSample[0] = src[0];
|
||||
case CUBIC:
|
||||
return new InterpolateCubic;
|
||||
|
||||
return i;
|
||||
}
|
||||
|
||||
|
||||
// Transposes the sample rate of the given samples using linear interpolation.
|
||||
// 'Mono' version of the routine. Returns the number of samples returned in
|
||||
// the "dest" buffer
|
||||
int RateTransposerFloat::transposeStereo(SAMPLETYPE *dest, const SAMPLETYPE *src, uint nSamples)
|
||||
{
|
||||
int i, remain;
|
||||
|
||||
if (nSamples == 0) return 0; // no samples, no work
|
||||
|
||||
remain = nSamples - 1;
|
||||
i = 0;
|
||||
|
||||
// Process the last sample saved from the sPrevSampleLious call first...
|
||||
while (fSlopeCount <= 1.0f)
|
||||
{
|
||||
dest[2 * i] = (SAMPLETYPE)((1.0f - fSlopeCount) * sPrevSample[0] + fSlopeCount * src[0]);
|
||||
dest[2 * i + 1] = (SAMPLETYPE)((1.0f - fSlopeCount) * sPrevSample[1] + fSlopeCount * src[1]);
|
||||
i++;
|
||||
fSlopeCount += fRate;
|
||||
}
|
||||
// now always (iSlopeCount > 1.0f)
|
||||
fSlopeCount -= 1.0f;
|
||||
|
||||
if (nSamples > 1)
|
||||
{
|
||||
while (1)
|
||||
{
|
||||
while (fSlopeCount > 1.0f)
|
||||
{
|
||||
fSlopeCount -= 1.0f;
|
||||
remain --;
|
||||
src += 2;
|
||||
if (remain == 0) goto end;
|
||||
}
|
||||
|
||||
dest[2 * i] = (SAMPLETYPE)((1.0f - fSlopeCount) * src[0]
|
||||
+ fSlopeCount * src[2]);
|
||||
dest[2 * i + 1] = (SAMPLETYPE)((1.0f - fSlopeCount) * src[1]
|
||||
+ fSlopeCount * src[3]);
|
||||
|
||||
i++;
|
||||
fSlopeCount += fRate;
|
||||
}
|
||||
}
|
||||
end:
|
||||
// Store the last sample for the next round
|
||||
sPrevSample[0] = src[0];
|
||||
sPrevSample[1] = src[1];
|
||||
|
||||
return i;
|
||||
}
|
||||
|
||||
int RateTransposerFloat::transposeMulti(SAMPLETYPE *dest, const SAMPLETYPE *src, uint nSamples)
|
||||
{
|
||||
int i, remaining;
|
||||
|
||||
if (nSamples == 0) return 0; // no samples, no work
|
||||
|
||||
remaining = nSamples - 1;
|
||||
i = 0;
|
||||
|
||||
// Process the last sample saved from the sPrevSampleLious call first...
|
||||
while (fSlopeCount <= 1.0f)
|
||||
{
|
||||
for (int c = 0; c < numChannels; c ++)
|
||||
{
|
||||
*dest = (SAMPLETYPE)((1.0f - fSlopeCount) * sPrevSample[c] + fSlopeCount * src[c]);
|
||||
dest ++;
|
||||
}
|
||||
i++;
|
||||
fSlopeCount += fRate;
|
||||
}
|
||||
// now always (iSlopeCount > 1.0f)
|
||||
fSlopeCount -= 1.0f;
|
||||
|
||||
while (remaining > 0)
|
||||
{
|
||||
while (fSlopeCount > 1.0f)
|
||||
{
|
||||
fSlopeCount -= 1.0f;
|
||||
src += numChannels;
|
||||
remaining --;
|
||||
if (remaining == 0) goto end;
|
||||
}
|
||||
|
||||
for (int c = 0; c < numChannels; c ++)
|
||||
{
|
||||
*dest = (SAMPLETYPE)((1.0f - fSlopeCount) * src[c]
|
||||
+ fSlopeCount * src[c + numChannels]);
|
||||
dest++;
|
||||
}
|
||||
|
||||
i++;
|
||||
fSlopeCount += fRate;
|
||||
}
|
||||
|
||||
end:
|
||||
// Store the last sample for the next round
|
||||
memcpy(sPrevSample, src, numChannels * sizeof(SAMPLETYPE));
|
||||
|
||||
return i;
|
||||
case SHANNON:
|
||||
return new InterpolateShannon;
|
||||
|
||||
default:
|
||||
assert(false);
|
||||
return NULL;
|
||||
}
|
||||
#endif
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user