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Fix include paths and compiling in Linux. Externals soundtouch is 1.7.1, while Ubuntu 12.10 is 1.6.x. Externals soundtouch is compiled with integer samples, while ubuntu is compiled with float samples. Float samples is probably the more common route. If you're going to use soundtouch, you should probably use SAMPLETYPE instead of explicitly choosing short. This probably breaks the windows build since its includes aren't setup.
This commit is contained in:
Ryan Houdek
808
Externals/soundtouch/TDStretch.cpp
vendored
Normal file
808
Externals/soundtouch/TDStretch.cpp
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@ -0,0 +1,808 @@
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////////////////////////////////////////////////////////////////////////////////
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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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||||
if (bAutoSeekSetting)
|
||||
{
|
||||
seek = AUTOSEEK_C + AUTOSEEK_K * tempo;
|
||||
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
|
||||
seekWindowLength = (sampleRate * sequenceMs) / 1000;
|
||||
if (seekWindowLength < 2 * overlapLength)
|
||||
{
|
||||
seekWindowLength = 2 * overlapLength;
|
||||
}
|
||||
seekLength = (sampleRate * seekWindowMs) / 1000;
|
||||
}
|
||||
|
||||
|
||||
|
||||
// Sets new target tempo. Normal tempo = 'SCALE', smaller values represent slower
|
||||
// tempo, larger faster tempo.
|
||||
void TDStretch::setTempo(float newTempo)
|
||||
{
|
||||
int intskip;
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||||
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||||
tempo = newTempo;
|
||||
|
||||
// Calculate new sequence duration
|
||||
calcSeqParameters();
|
||||
|
||||
// Calculate ideal skip length (according to tempo value)
|
||||
nominalSkip = tempo * (seekWindowLength - overlapLength);
|
||||
intskip = (int)(nominalSkip + 0.5f);
|
||||
|
||||
// Calculate how many samples are needed in the 'inputBuffer' to
|
||||
// process another batch of samples
|
||||
//sampleReq = max(intskip + overlapLength, seekWindowLength) + seekLength / 2;
|
||||
sampleReq = max(intskip + overlapLength, seekWindowLength) + seekLength;
|
||||
}
|
||||
|
||||
|
||||
|
||||
// Sets the number of channels, 1 = mono, 2 = stereo
|
||||
void TDStretch::setChannels(int numChannels)
|
||||
{
|
||||
assert(numChannels > 0);
|
||||
if (channels == numChannels) return;
|
||||
assert(numChannels == 1 || numChannels == 2);
|
||||
|
||||
channels = numChannels;
|
||||
inputBuffer.setChannels(channels);
|
||||
outputBuffer.setChannels(channels);
|
||||
}
|
||||
|
||||
|
||||
// nominal tempo, no need for processing, just pass the samples through
|
||||
// to outputBuffer
|
||||
/*
|
||||
void TDStretch::processNominalTempo()
|
||||
{
|
||||
assert(tempo == 1.0f);
|
||||
|
||||
if (bMidBufferDirty)
|
||||
{
|
||||
// If there are samples in pMidBuffer waiting for overlapping,
|
||||
// do a single sliding overlapping with them in order to prevent a
|
||||
// clicking distortion in the output sound
|
||||
if (inputBuffer.numSamples() < overlapLength)
|
||||
{
|
||||
// wait until we've got overlapLength input samples
|
||||
return;
|
||||
}
|
||||
// Mix the samples in the beginning of 'inputBuffer' with the
|
||||
// samples in 'midBuffer' using sliding overlapping
|
||||
overlap(outputBuffer.ptrEnd(overlapLength), inputBuffer.ptrBegin(), 0);
|
||||
outputBuffer.putSamples(overlapLength);
|
||||
inputBuffer.receiveSamples(overlapLength);
|
||||
clearMidBuffer();
|
||||
// now we've caught the nominal sample flow and may switch to
|
||||
// bypass mode
|
||||
}
|
||||
|
||||
// Simply bypass samples from input to output
|
||||
outputBuffer.moveSamples(inputBuffer);
|
||||
}
|
||||
*/
|
||||
|
||||
#include <stdio.h>
|
||||
|
||||
// Processes as many processing frames of the samples 'inputBuffer', store
|
||||
// the result into 'outputBuffer'
|
||||
void TDStretch::processSamples()
|
||||
{
|
||||
int ovlSkip, offset;
|
||||
int temp;
|
||||
|
||||
/* Removed this small optimization - can introduce a click to sound when tempo setting
|
||||
crosses the nominal value
|
||||
if (tempo == 1.0f)
|
||||
{
|
||||
// tempo not changed from the original, so bypass the processing
|
||||
processNominalTempo();
|
||||
return;
|
||||
}
|
||||
*/
|
||||
|
||||
// Process samples as long as there are enough samples in 'inputBuffer'
|
||||
// to form a processing frame.
|
||||
while ((int)inputBuffer.numSamples() >= sampleReq)
|
||||
{
|
||||
// If tempo differs from the normal ('SCALE'), scan for the best overlapping
|
||||
// position
|
||||
offset = seekBestOverlapPosition(inputBuffer.ptrBegin());
|
||||
|
||||
// Mix the samples in the 'inputBuffer' at position of 'offset' with the
|
||||
// samples in 'midBuffer' using sliding overlapping
|
||||
// ... first partially overlap with the end of the previous sequence
|
||||
// (that's in 'midBuffer')
|
||||
overlap(outputBuffer.ptrEnd((uint)overlapLength), inputBuffer.ptrBegin(), (uint)offset);
|
||||
outputBuffer.putSamples((uint)overlapLength);
|
||||
|
||||
// ... then copy sequence samples from 'inputBuffer' to output:
|
||||
|
||||
// length of sequence
|
||||
temp = (seekWindowLength - 2 * overlapLength);
|
||||
|
||||
// crosscheck that we don't have buffer overflow...
|
||||
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
|
||||
Reference in New Issue
Block a user