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https://github.com/cookiengineer/audacity
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809 lines
24 KiB
C++
809 lines
24 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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///
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/// Sampled sound tempo changer/time stretch algorithm. Changes the sound tempo
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/// while maintaining the original pitch by using a time domain WSOLA-like
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/// method with several performance-increasing tweaks.
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///
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/// Note : MMX optimized functions reside in a separate, platform-specific
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/// file, e.g. 'mmx_win.cpp' or 'mmx_gcc.cpp'
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///
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/// Author : Copyright (c) Olli Parviainen
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/// Author e-mail : oparviai 'at' iki.fi
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/// SoundTouch WWW: http://www.surina.net/soundtouch
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///
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////////////////////////////////////////////////////////////////////////////////
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//
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// Last changed : $Date: 2012-11-08 20:53:01 +0200 (Thu, 08 Nov 2012) $
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// File revision : $Revision: 1.12 $
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//
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// $Id: TDStretch.cpp 160 2012-11-08 18:53:01Z oparviai $
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//
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////////////////////////////////////////////////////////////////////////////////
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//
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// License :
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//
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// SoundTouch audio processing library
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// Copyright (c) Olli Parviainen
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 2.1 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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//
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////////////////////////////////////////////////////////////////////////////////
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#include <string.h>
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#include <limits.h>
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#include <assert.h>
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#include <math.h>
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#include <float.h>
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#include "STTypes.h"
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#include "cpu_detect.h"
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#include "TDStretch.h"
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#include <stdio.h>
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using namespace soundtouch;
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#define max(x, y) (((x) > (y)) ? (x) : (y))
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/*****************************************************************************
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*
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* Constant definitions
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*
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*****************************************************************************/
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// Table for the hierarchical mixing position seeking algorithm
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static const short _scanOffsets[5][24]={
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{ 124, 186, 248, 310, 372, 434, 496, 558, 620, 682, 744, 806,
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868, 930, 992, 1054, 1116, 1178, 1240, 1302, 1364, 1426, 1488, 0},
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{-100, -75, -50, -25, 25, 50, 75, 100, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
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{ -20, -15, -10, -5, 5, 10, 15, 20, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
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{ -4, -3, -2, -1, 1, 2, 3, 4, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
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{ 121, 114, 97, 114, 98, 105, 108, 32, 104, 99, 117, 111,
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116, 100, 110, 117, 111, 115, 0, 0, 0, 0, 0, 0}};
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/*****************************************************************************
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*
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* Implementation of the class 'TDStretch'
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*
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*****************************************************************************/
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TDStretch::TDStretch() : FIFOProcessor(&outputBuffer)
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{
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bQuickSeek = FALSE;
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channels = 2;
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pMidBuffer = NULL;
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pMidBufferUnaligned = NULL;
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overlapLength = 0;
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bAutoSeqSetting = TRUE;
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bAutoSeekSetting = TRUE;
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// outDebt = 0;
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skipFract = 0;
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tempo = 1.0f;
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setParameters(44100, DEFAULT_SEQUENCE_MS, DEFAULT_SEEKWINDOW_MS, DEFAULT_OVERLAP_MS);
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setTempo(1.0f);
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clear();
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}
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TDStretch::~TDStretch()
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{
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delete[] pMidBufferUnaligned;
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}
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// Sets routine control parameters. These control are certain time constants
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// defining how the sound is stretched to the desired duration.
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//
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// 'sampleRate' = sample rate of the sound
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// 'sequenceMS' = one processing sequence length in milliseconds (default = 82 ms)
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// 'seekwindowMS' = seeking window length for scanning the best overlapping
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// position (default = 28 ms)
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// 'overlapMS' = overlapping length (default = 12 ms)
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void TDStretch::setParameters(int aSampleRate, int aSequenceMS,
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int aSeekWindowMS, int aOverlapMS)
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{
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// accept only positive parameter values - if zero or negative, use old values instead
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if (aSampleRate > 0) this->sampleRate = aSampleRate;
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if (aOverlapMS > 0) this->overlapMs = aOverlapMS;
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if (aSequenceMS > 0)
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{
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this->sequenceMs = aSequenceMS;
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bAutoSeqSetting = FALSE;
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}
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else if (aSequenceMS == 0)
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{
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// if zero, use automatic setting
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bAutoSeqSetting = TRUE;
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}
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if (aSeekWindowMS > 0)
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{
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this->seekWindowMs = aSeekWindowMS;
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bAutoSeekSetting = FALSE;
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}
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else if (aSeekWindowMS == 0)
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{
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// if zero, use automatic setting
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bAutoSeekSetting = TRUE;
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}
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calcSeqParameters();
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calculateOverlapLength(overlapMs);
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// set tempo to recalculate 'sampleReq'
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setTempo(tempo);
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}
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/// Get routine control parameters, see setParameters() function.
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/// Any of the parameters to this function can be NULL, in such case corresponding parameter
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/// value isn't returned.
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void TDStretch::getParameters(int *pSampleRate, int *pSequenceMs, int *pSeekWindowMs, int *pOverlapMs) const
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{
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if (pSampleRate)
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{
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*pSampleRate = sampleRate;
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}
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if (pSequenceMs)
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{
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*pSequenceMs = (bAutoSeqSetting) ? (USE_AUTO_SEQUENCE_LEN) : sequenceMs;
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}
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if (pSeekWindowMs)
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{
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*pSeekWindowMs = (bAutoSeekSetting) ? (USE_AUTO_SEEKWINDOW_LEN) : seekWindowMs;
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}
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if (pOverlapMs)
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{
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*pOverlapMs = overlapMs;
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}
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}
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// Overlaps samples in 'midBuffer' with the samples in 'pInput'
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void TDStretch::overlapMono(SAMPLETYPE *pOutput, const SAMPLETYPE *pInput) const
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{
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int i;
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SAMPLETYPE m1, m2;
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m1 = (SAMPLETYPE)0;
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m2 = (SAMPLETYPE)overlapLength;
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for (i = 0; i < overlapLength ; i ++)
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{
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pOutput[i] = (pInput[i] * m1 + pMidBuffer[i] * m2 ) / overlapLength;
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m1 += 1;
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m2 -= 1;
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}
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}
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void TDStretch::clearMidBuffer()
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{
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memset(pMidBuffer, 0, 2 * sizeof(SAMPLETYPE) * overlapLength);
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}
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void TDStretch::clearInput()
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{
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inputBuffer.clear();
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clearMidBuffer();
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}
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// Clears the sample buffers
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void TDStretch::clear()
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{
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outputBuffer.clear();
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clearInput();
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}
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// Enables/disables the quick position seeking algorithm. Zero to disable, nonzero
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// to enable
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void TDStretch::enableQuickSeek(BOOL enable)
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{
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bQuickSeek = enable;
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}
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// Returns nonzero if the quick seeking algorithm is enabled.
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BOOL TDStretch::isQuickSeekEnabled() const
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{
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return bQuickSeek;
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}
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// Seeks for the optimal overlap-mixing position.
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int TDStretch::seekBestOverlapPosition(const SAMPLETYPE *refPos)
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{
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if (bQuickSeek)
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{
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return seekBestOverlapPositionQuick(refPos);
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}
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else
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{
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return seekBestOverlapPositionFull(refPos);
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}
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}
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// Overlaps samples in 'midBuffer' with the samples in 'pInputBuffer' at position
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// of 'ovlPos'.
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inline void TDStretch::overlap(SAMPLETYPE *pOutput, const SAMPLETYPE *pInput, uint ovlPos) const
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{
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if (channels == 2)
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{
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// stereo sound
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overlapStereo(pOutput, pInput + 2 * ovlPos);
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} else {
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// mono sound.
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overlapMono(pOutput, pInput + ovlPos);
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}
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}
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// Seeks for the optimal overlap-mixing position. The 'stereo' version of the
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// routine
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//
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// The best position is determined as the position where the two overlapped
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// sample sequences are 'most alike', in terms of the highest cross-correlation
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// value over the overlapping period
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int TDStretch::seekBestOverlapPositionFull(const SAMPLETYPE *refPos)
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{
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int bestOffs;
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double bestCorr, corr;
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int i;
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bestCorr = FLT_MIN;
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bestOffs = 0;
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// Scans for the best correlation value by testing each possible position
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// over the permitted range.
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for (i = 0; i < seekLength; i ++)
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{
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// Calculates correlation value for the mixing position corresponding
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// to 'i'
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corr = calcCrossCorr(refPos + channels * i, pMidBuffer);
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// heuristic rule to slightly favour values close to mid of the range
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double tmp = (double)(2 * i - seekLength) / (double)seekLength;
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corr = ((corr + 0.1) * (1.0 - 0.25 * tmp * tmp));
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// Checks for the highest correlation value
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if (corr > bestCorr)
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{
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bestCorr = corr;
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bestOffs = i;
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}
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}
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// clear cross correlation routine state if necessary (is so e.g. in MMX routines).
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clearCrossCorrState();
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return bestOffs;
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}
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// Seeks for the optimal overlap-mixing position. The 'stereo' version of the
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// routine
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//
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// The best position is determined as the position where the two overlapped
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// sample sequences are 'most alike', in terms of the highest cross-correlation
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// value over the overlapping period
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int TDStretch::seekBestOverlapPositionQuick(const SAMPLETYPE *refPos)
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{
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int j;
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int bestOffs;
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double bestCorr, corr;
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int scanCount, corrOffset, tempOffset;
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bestCorr = FLT_MIN;
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bestOffs = _scanOffsets[0][0];
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corrOffset = 0;
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tempOffset = 0;
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// Scans for the best correlation value using four-pass hierarchical search.
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//
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// The look-up table 'scans' has hierarchical position adjusting steps.
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// In first pass the routine searhes for the highest correlation with
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// relatively coarse steps, then rescans the neighbourhood of the highest
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// correlation with better resolution and so on.
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for (scanCount = 0;scanCount < 4; scanCount ++)
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{
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j = 0;
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while (_scanOffsets[scanCount][j])
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{
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tempOffset = corrOffset + _scanOffsets[scanCount][j];
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if (tempOffset >= seekLength) break;
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// Calculates correlation value for the mixing position corresponding
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// to 'tempOffset'
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corr = (double)calcCrossCorr(refPos + channels * tempOffset, pMidBuffer);
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// heuristic rule to slightly favour values close to mid of the range
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double tmp = (double)(2 * tempOffset - seekLength) / seekLength;
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corr = ((corr + 0.1) * (1.0 - 0.25 * tmp * tmp));
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// Checks for the highest correlation value
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if (corr > bestCorr)
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{
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bestCorr = corr;
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bestOffs = tempOffset;
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}
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j ++;
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}
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corrOffset = bestOffs;
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}
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// clear cross correlation routine state if necessary (is so e.g. in MMX routines).
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clearCrossCorrState();
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return bestOffs;
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}
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/// clear cross correlation routine state if necessary
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void TDStretch::clearCrossCorrState()
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{
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// default implementation is empty.
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}
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/// Calculates processing sequence length according to tempo setting
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void TDStretch::calcSeqParameters()
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{
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// Adjust tempo param according to tempo, so that variating processing sequence length is used
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// at varius tempo settings, between the given low...top limits
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#define AUTOSEQ_TEMPO_LOW 0.5 // auto setting low tempo range (-50%)
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#define AUTOSEQ_TEMPO_TOP 2.0 // auto setting top tempo range (+100%)
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// sequence-ms setting values at above low & top tempo
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#define AUTOSEQ_AT_MIN 125.0
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#define AUTOSEQ_AT_MAX 50.0
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#define AUTOSEQ_K ((AUTOSEQ_AT_MAX - AUTOSEQ_AT_MIN) / (AUTOSEQ_TEMPO_TOP - AUTOSEQ_TEMPO_LOW))
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#define AUTOSEQ_C (AUTOSEQ_AT_MIN - (AUTOSEQ_K) * (AUTOSEQ_TEMPO_LOW))
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// seek-window-ms setting values at above low & top tempo
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#define AUTOSEEK_AT_MIN 25.0
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#define AUTOSEEK_AT_MAX 15.0
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#define AUTOSEEK_K ((AUTOSEEK_AT_MAX - AUTOSEEK_AT_MIN) / (AUTOSEQ_TEMPO_TOP - AUTOSEQ_TEMPO_LOW))
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#define AUTOSEEK_C (AUTOSEEK_AT_MIN - (AUTOSEEK_K) * (AUTOSEQ_TEMPO_LOW))
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#define CHECK_LIMITS(x, mi, ma) (((x) < (mi)) ? (mi) : (((x) > (ma)) ? (ma) : (x)))
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double seq, seek;
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if (bAutoSeqSetting)
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{
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seq = AUTOSEQ_C + AUTOSEQ_K * tempo;
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seq = CHECK_LIMITS(seq, AUTOSEQ_AT_MAX, AUTOSEQ_AT_MIN);
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sequenceMs = (int)(seq + 0.5);
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}
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if (bAutoSeekSetting)
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{
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seek = AUTOSEEK_C + AUTOSEEK_K * tempo;
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seek = CHECK_LIMITS(seek, AUTOSEEK_AT_MAX, AUTOSEEK_AT_MIN);
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seekWindowMs = (int)(seek + 0.5);
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}
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// Update seek window lengths
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seekWindowLength = (sampleRate * sequenceMs) / 1000;
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if (seekWindowLength < 2 * overlapLength)
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{
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seekWindowLength = 2 * overlapLength;
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}
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seekLength = (sampleRate * seekWindowMs) / 1000;
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}
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// Sets new target tempo. Normal tempo = 'SCALE', smaller values represent slower
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// tempo, larger faster tempo.
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void TDStretch::setTempo(float newTempo)
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{
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int intskip;
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tempo = newTempo;
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// Calculate new sequence duration
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calcSeqParameters();
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// Calculate ideal skip length (according to tempo value)
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nominalSkip = tempo * (seekWindowLength - overlapLength);
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intskip = (int)(nominalSkip + 0.5f);
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// Calculate how many samples are needed in the 'inputBuffer' to
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// process another batch of samples
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//sampleReq = max(intskip + overlapLength, seekWindowLength) + seekLength / 2;
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sampleReq = max(intskip + overlapLength, seekWindowLength) + seekLength;
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}
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// Sets the number of channels, 1 = mono, 2 = stereo
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void TDStretch::setChannels(int numChannels)
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{
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assert(numChannels > 0);
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if (channels == numChannels) return;
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assert(numChannels == 1 || numChannels == 2);
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channels = numChannels;
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inputBuffer.setChannels(channels);
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outputBuffer.setChannels(channels);
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}
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// nominal tempo, no need for processing, just pass the samples through
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// to outputBuffer
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/*
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void TDStretch::processNominalTempo()
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{
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assert(tempo == 1.0f);
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if (bMidBufferDirty)
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{
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// If there are samples in pMidBuffer waiting for overlapping,
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// do a single sliding overlapping with them in order to prevent a
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// clicking distortion in the output sound
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if (inputBuffer.numSamples() < overlapLength)
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{
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// wait until we've got overlapLength input samples
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return;
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}
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// Mix the samples in the beginning of 'inputBuffer' with the
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// samples in 'midBuffer' using sliding overlapping
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overlap(outputBuffer.ptrEnd(overlapLength), inputBuffer.ptrBegin(), 0);
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outputBuffer.putSamples(overlapLength);
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inputBuffer.receiveSamples(overlapLength);
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clearMidBuffer();
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// now we've caught the nominal sample flow and may switch to
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// bypass mode
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}
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// Simply bypass samples from input to output
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outputBuffer.moveSamples(inputBuffer);
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}
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*/
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#include <stdio.h>
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// Processes as many processing frames of the samples 'inputBuffer', store
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// the result into 'outputBuffer'
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void TDStretch::processSamples()
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{
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int ovlSkip, offset;
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int temp;
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/* Removed this small optimization - can introduce a click to sound when tempo setting
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crosses the nominal value
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if (tempo == 1.0f)
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{
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// tempo not changed from the original, so bypass the processing
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processNominalTempo();
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return;
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}
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*/
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// Process samples as long as there are enough samples in 'inputBuffer'
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// to form a processing frame.
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while ((int)inputBuffer.numSamples() >= sampleReq)
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{
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// If tempo differs from the normal ('SCALE'), scan for the best overlapping
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// position
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offset = seekBestOverlapPosition(inputBuffer.ptrBegin());
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// Mix the samples in the 'inputBuffer' at position of 'offset' with the
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// samples in 'midBuffer' using sliding overlapping
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// ... first partially overlap with the end of the previous sequence
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// (that's in 'midBuffer')
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overlap(outputBuffer.ptrEnd((uint)overlapLength), inputBuffer.ptrBegin(), (uint)offset);
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outputBuffer.putSamples((uint)overlapLength);
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// ... then copy sequence samples from 'inputBuffer' to output:
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// length of sequence
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temp = (seekWindowLength - 2 * overlapLength);
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// crosscheck that we don't have buffer overflow...
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if ((int)inputBuffer.numSamples() < (offset + temp + overlapLength * 2))
|
|
{
|
|
continue; // just in case, shouldn't really happen
|
|
}
|
|
|
|
outputBuffer.putSamples(inputBuffer.ptrBegin() + channels * (offset + overlapLength), (uint)temp);
|
|
|
|
// Copies the end of the current sequence from 'inputBuffer' to
|
|
// 'midBuffer' for being mixed with the beginning of the next
|
|
// processing sequence and so on
|
|
assert((offset + temp + overlapLength * 2) <= (int)inputBuffer.numSamples());
|
|
memcpy(pMidBuffer, inputBuffer.ptrBegin() + channels * (offset + temp + overlapLength),
|
|
channels * sizeof(SAMPLETYPE) * overlapLength);
|
|
|
|
// Remove the processed samples from the input buffer. Update
|
|
// the difference between integer & nominal skip step to 'skipFract'
|
|
// in order to prevent the error from accumulating over time.
|
|
skipFract += nominalSkip; // real skip size
|
|
ovlSkip = (int)skipFract; // rounded to integer skip
|
|
skipFract -= ovlSkip; // maintain the fraction part, i.e. real vs. integer skip
|
|
inputBuffer.receiveSamples((uint)ovlSkip);
|
|
}
|
|
}
|
|
|
|
|
|
// Adds 'numsamples' pcs of samples from the 'samples' memory position into
|
|
// the input of the object.
|
|
void TDStretch::putSamples(const SAMPLETYPE *samples, uint nSamples)
|
|
{
|
|
// Add the samples into the input buffer
|
|
inputBuffer.putSamples(samples, nSamples);
|
|
// Process the samples in input buffer
|
|
processSamples();
|
|
}
|
|
|
|
|
|
|
|
/// Set new overlap length parameter & reallocate RefMidBuffer if necessary.
|
|
void TDStretch::acceptNewOverlapLength(int newOverlapLength)
|
|
{
|
|
int prevOvl;
|
|
|
|
assert(newOverlapLength >= 0);
|
|
prevOvl = overlapLength;
|
|
overlapLength = newOverlapLength;
|
|
|
|
if (overlapLength > prevOvl)
|
|
{
|
|
delete[] pMidBufferUnaligned;
|
|
|
|
pMidBufferUnaligned = new SAMPLETYPE[overlapLength * 2 + 16 / sizeof(SAMPLETYPE)];
|
|
// ensure that 'pMidBuffer' is aligned to 16 byte boundary for efficiency
|
|
pMidBuffer = (SAMPLETYPE *)SOUNDTOUCH_ALIGN_POINTER_16(pMidBufferUnaligned);
|
|
|
|
clearMidBuffer();
|
|
}
|
|
}
|
|
|
|
|
|
// Operator 'new' is overloaded so that it automatically creates a suitable instance
|
|
// depending on if we've a MMX/SSE/etc-capable CPU available or not.
|
|
void * TDStretch::operator new(size_t s)
|
|
{
|
|
// Notice! don't use "new TDStretch" directly, use "newInstance" to create a new instance instead!
|
|
ST_THROW_RT_ERROR("Error in TDStretch::new: Don't use 'new TDStretch' directly, use 'newInstance' member instead!");
|
|
return newInstance();
|
|
}
|
|
|
|
|
|
TDStretch * TDStretch::newInstance()
|
|
{
|
|
uint uExtensions;
|
|
|
|
uExtensions = detectCPUextensions();
|
|
|
|
// Check if MMX/SSE instruction set extensions supported by CPU
|
|
|
|
#ifdef SOUNDTOUCH_ALLOW_MMX
|
|
// MMX routines available only with integer sample types
|
|
if (uExtensions & SUPPORT_MMX)
|
|
{
|
|
return ::new TDStretchMMX;
|
|
}
|
|
else
|
|
#endif // SOUNDTOUCH_ALLOW_MMX
|
|
|
|
|
|
#ifdef SOUNDTOUCH_ALLOW_SSE
|
|
if (uExtensions & SUPPORT_SSE)
|
|
{
|
|
// SSE support
|
|
return ::new TDStretchSSE;
|
|
}
|
|
else
|
|
#endif // SOUNDTOUCH_ALLOW_SSE
|
|
|
|
{
|
|
// ISA optimizations not supported, use plain C version
|
|
return ::new TDStretch;
|
|
}
|
|
}
|
|
|
|
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// Integer arithmetics specific algorithm implementations.
|
|
//
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
|
|
#ifdef SOUNDTOUCH_INTEGER_SAMPLES
|
|
|
|
// Overlaps samples in 'midBuffer' with the samples in 'input'. The 'Stereo'
|
|
// version of the routine.
|
|
void TDStretch::overlapStereo(short *poutput, const short *input) const
|
|
{
|
|
int i;
|
|
short temp;
|
|
int cnt2;
|
|
|
|
for (i = 0; i < overlapLength ; i ++)
|
|
{
|
|
temp = (short)(overlapLength - i);
|
|
cnt2 = 2 * i;
|
|
poutput[cnt2] = (input[cnt2] * i + pMidBuffer[cnt2] * temp ) / overlapLength;
|
|
poutput[cnt2 + 1] = (input[cnt2 + 1] * i + pMidBuffer[cnt2 + 1] * temp ) / overlapLength;
|
|
}
|
|
}
|
|
|
|
// Calculates the x having the closest 2^x value for the given value
|
|
static int _getClosest2Power(double value)
|
|
{
|
|
return (int)(log(value) / log(2.0) + 0.5);
|
|
}
|
|
|
|
|
|
/// Calculates overlap period length in samples.
|
|
/// Integer version rounds overlap length to closest power of 2
|
|
/// for a divide scaling operation.
|
|
void TDStretch::calculateOverlapLength(int aoverlapMs)
|
|
{
|
|
int newOvl;
|
|
|
|
assert(aoverlapMs >= 0);
|
|
|
|
// calculate overlap length so that it's power of 2 - thus it's easy to do
|
|
// integer division by right-shifting. Term "-1" at end is to account for
|
|
// the extra most significatnt bit left unused in result by signed multiplication
|
|
overlapDividerBits = _getClosest2Power((sampleRate * aoverlapMs) / 1000.0) - 1;
|
|
if (overlapDividerBits > 9) overlapDividerBits = 9;
|
|
if (overlapDividerBits < 3) overlapDividerBits = 3;
|
|
newOvl = (int)pow(2.0, (int)overlapDividerBits + 1); // +1 => account for -1 above
|
|
|
|
acceptNewOverlapLength(newOvl);
|
|
|
|
// calculate sloping divider so that crosscorrelation operation won't
|
|
// overflow 32-bit register. Max. sum of the crosscorrelation sum without
|
|
// divider would be 2^30*(N^3-N)/3, where N = overlap length
|
|
slopingDivider = (newOvl * newOvl - 1) / 3;
|
|
}
|
|
|
|
|
|
double TDStretch::calcCrossCorr(const short *mixingPos, const short *compare) const
|
|
{
|
|
long corr;
|
|
long norm;
|
|
int i;
|
|
|
|
corr = norm = 0;
|
|
// Same routine for stereo and mono. For stereo, unroll loop for better
|
|
// efficiency and gives slightly better resolution against rounding.
|
|
// For mono it same routine, just unrolls loop by factor of 4
|
|
for (i = 0; i < channels * overlapLength; i += 4)
|
|
{
|
|
corr += (mixingPos[i] * compare[i] +
|
|
mixingPos[i + 1] * compare[i + 1] +
|
|
mixingPos[i + 2] * compare[i + 2] +
|
|
mixingPos[i + 3] * compare[i + 3]) >> overlapDividerBits;
|
|
norm += (mixingPos[i] * mixingPos[i] +
|
|
mixingPos[i + 1] * mixingPos[i + 1] +
|
|
mixingPos[i + 2] * mixingPos[i + 2] +
|
|
mixingPos[i + 3] * mixingPos[i + 3]) >> overlapDividerBits;
|
|
}
|
|
|
|
// Normalize result by dividing by sqrt(norm) - this step is easiest
|
|
// done using floating point operation
|
|
if (norm == 0) norm = 1; // to avoid div by zero
|
|
return (double)corr / sqrt((double)norm);
|
|
}
|
|
|
|
#endif // SOUNDTOUCH_INTEGER_SAMPLES
|
|
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// Floating point arithmetics specific algorithm implementations.
|
|
//
|
|
|
|
#ifdef SOUNDTOUCH_FLOAT_SAMPLES
|
|
|
|
// Overlaps samples in 'midBuffer' with the samples in 'pInput'
|
|
void TDStretch::overlapStereo(float *pOutput, const float *pInput) const
|
|
{
|
|
int i;
|
|
float fScale;
|
|
float f1;
|
|
float f2;
|
|
|
|
fScale = 1.0f / (float)overlapLength;
|
|
|
|
f1 = 0;
|
|
f2 = 1.0f;
|
|
|
|
for (i = 0; i < 2 * (int)overlapLength ; i += 2)
|
|
{
|
|
pOutput[i + 0] = pInput[i + 0] * f1 + pMidBuffer[i + 0] * f2;
|
|
pOutput[i + 1] = pInput[i + 1] * f1 + pMidBuffer[i + 1] * f2;
|
|
|
|
f1 += fScale;
|
|
f2 -= fScale;
|
|
}
|
|
}
|
|
|
|
|
|
/// Calculates overlapInMsec period length in samples.
|
|
void TDStretch::calculateOverlapLength(int overlapInMsec)
|
|
{
|
|
int newOvl;
|
|
|
|
assert(overlapInMsec >= 0);
|
|
newOvl = (sampleRate * overlapInMsec) / 1000;
|
|
if (newOvl < 16) newOvl = 16;
|
|
|
|
// must be divisible by 8
|
|
newOvl -= newOvl % 8;
|
|
|
|
acceptNewOverlapLength(newOvl);
|
|
}
|
|
|
|
|
|
double TDStretch::calcCrossCorr(const float *mixingPos, const float *compare) const
|
|
{
|
|
double corr;
|
|
double norm;
|
|
int i;
|
|
|
|
corr = norm = 0;
|
|
// Same routine for stereo and mono. For Stereo, unroll by factor of 2.
|
|
// For mono it's same routine yet unrollsd by factor of 4.
|
|
for (i = 0; i < channels * overlapLength; i += 4)
|
|
{
|
|
corr += mixingPos[i] * compare[i] +
|
|
mixingPos[i + 1] * compare[i + 1];
|
|
|
|
norm += mixingPos[i] * mixingPos[i] +
|
|
mixingPos[i + 1] * mixingPos[i + 1];
|
|
|
|
// unroll the loop for better CPU efficiency:
|
|
corr += mixingPos[i + 2] * compare[i + 2] +
|
|
mixingPos[i + 3] * compare[i + 3];
|
|
|
|
norm += mixingPos[i + 2] * mixingPos[i + 2] +
|
|
mixingPos[i + 3] * mixingPos[i + 3];
|
|
}
|
|
|
|
if (norm < 1e-9) norm = 1.0; // to avoid div by zero
|
|
return corr / sqrt(norm);
|
|
}
|
|
|
|
#endif // SOUNDTOUCH_FLOAT_SAMPLES
|