The Tor Browser: comparison media/libsoundtouch/src/TDStretch.h

--1:000000000000
+:86f2d37c3488
+////////////////////////////////////////////////////////////////////////////////
+///
+/// Sampled sound tempo changer/time stretch algorithm. Changes the sound tempo
+/// while maintaining the original pitch by using a time domain WSOLA-like method
+/// with several performance-increasing tweaks.
+///
+/// Note : MMX/SSE optimized functions reside in separate, platform-specific files
+/// 'mmx_optimized.cpp' and 'sse_optimized.cpp'
+///
+/// Author        : Copyright (c) Olli Parviainen
+/// Author e-mail : oparviai 'at' iki.fi
+/// SoundTouch WWW: http://www.surina.net/soundtouch
+///
+////////////////////////////////////////////////////////////////////////////////
+//
+// Last changed  : $Date: 2014-04-06 10:57:21 -0500 (Sun, 06 Apr 2014) $
+// File revision : $Revision: 4 $
+//
+// $Id: TDStretch.h 195 2014-04-06 15:57:21Z oparviai $
+//
+////////////////////////////////////////////////////////////////////////////////
+//
+// License :
+//
+//  SoundTouch audio processing library
+//  Copyright (c) Olli Parviainen
+//
+//  This library is free software; you can redistribute it and/or
+//  modify it under the terms of the GNU Lesser General Public
+//  License as published by the Free Software Foundation; either
+//  version 2.1 of the License, or (at your option) any later version.
+//
+//  This library is distributed in the hope that it will be useful,
+//  but WITHOUT ANY WARRANTY; without even the implied warranty of
+//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+//  Lesser General Public License for more details.
+//
+//  You should have received a copy of the GNU Lesser General Public
+//  License along with this library; if not, write to the Free Software
+//  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+//
+////////////////////////////////////////////////////////////////////////////////
+#ifndef TDStretch_H
+#define TDStretch_H
+#include <stddef.h>
+#include "STTypes.h"
+#include "RateTransposer.h"
+#include "FIFOSamplePipe.h"
+namespace soundtouch
+{
+/// Default values for sound processing parameters:
+/// Notice that the default parameters are tuned for contemporary popular music
+/// processing. For speech processing applications these parameters suit better:
+///     #define DEFAULT_SEQUENCE_MS     40
+///     #define DEFAULT_SEEKWINDOW_MS   15
+///     #define DEFAULT_OVERLAP_MS      8
+///
+/// Default length of a single processing sequence, in milliseconds. This determines to how
+/// long sequences the original sound is chopped in the time-stretch algorithm.
+///
+/// The larger this value is, the lesser sequences are used in processing. In principle
+/// a bigger value sounds better when slowing down tempo, but worse when increasing tempo
+/// and vice versa.
+///
+/// Increasing this value reduces computational burden & vice versa.
+//#define DEFAULT_SEQUENCE_MS         40
+#define DEFAULT_SEQUENCE_MS         USE_AUTO_SEQUENCE_LEN
+/// Giving this value for the sequence length sets automatic parameter value
+/// according to tempo setting (recommended)
+#define USE_AUTO_SEQUENCE_LEN       0
+/// Seeking window default length in milliseconds for algorithm that finds the best possible
+/// overlapping location. This determines from how wide window the algorithm may look for an
+/// optimal joining location when mixing the sound sequences back together.
+///
+/// The bigger this window setting is, the higher the possibility to find a better mixing
+/// position will become, but at the same time large values may cause a "drifting" artifact
+/// because consequent sequences will be taken at more uneven intervals.
+///
+/// If there's a disturbing artifact that sounds as if a constant frequency was drifting
+/// around, try reducing this setting.
+///
+/// Increasing this value increases computational burden & vice versa.
+//#define DEFAULT_SEEKWINDOW_MS       15
+#define DEFAULT_SEEKWINDOW_MS       USE_AUTO_SEEKWINDOW_LEN
+/// Giving this value for the seek window length sets automatic parameter value
+/// according to tempo setting (recommended)
+#define USE_AUTO_SEEKWINDOW_LEN     0
+/// Overlap length in milliseconds. When the chopped sound sequences are mixed back together,
+/// to form a continuous sound stream, this parameter defines over how long period the two
+/// consecutive sequences are let to overlap each other.
+///
+/// This shouldn't be that critical parameter. If you reduce the DEFAULT_SEQUENCE_MS setting
+/// by a large amount, you might wish to try a smaller value on this.
+///
+/// Increasing this value increases computational burden & vice versa.
+#define DEFAULT_OVERLAP_MS      8
+/// Class that does the time-stretch (tempo change) effect for the processed
+/// sound.
+class TDStretch : public FIFOProcessor
+{
+protected:
+int channels;
+int sampleReq;
+float tempo;
+SAMPLETYPE *pMidBuffer;
+SAMPLETYPE *pMidBufferUnaligned;
+int overlapLength;
+int seekLength;
+int seekWindowLength;
+int overlapDividerBits;
+int slopingDivider;
+float nominalSkip;
+float skipFract;
+FIFOSampleBuffer outputBuffer;
+FIFOSampleBuffer inputBuffer;
+bool bQuickSeek;
+int sampleRate;
+int sequenceMs;
+int seekWindowMs;
+int overlapMs;
+bool bAutoSeqSetting;
+bool bAutoSeekSetting;
+void acceptNewOverlapLength(int newOverlapLength);
+virtual void clearCrossCorrState();
+void calculateOverlapLength(int overlapMs);
+virtual double calcCrossCorr(const SAMPLETYPE *mixingPos, const SAMPLETYPE *compare, double &norm) const;
+virtual double calcCrossCorrAccumulate(const SAMPLETYPE *mixingPos, const SAMPLETYPE *compare, double &norm) const;
+virtual int seekBestOverlapPositionFull(const SAMPLETYPE *refPos);
+virtual int seekBestOverlapPositionQuick(const SAMPLETYPE *refPos);
+int seekBestOverlapPosition(const SAMPLETYPE *refPos);
+virtual void overlapStereo(SAMPLETYPE *output, const SAMPLETYPE *input) const;
+virtual void overlapMono(SAMPLETYPE *output, const SAMPLETYPE *input) const;
+virtual void overlapMulti(SAMPLETYPE *output, const SAMPLETYPE *input) const;
+void clearMidBuffer();
+void overlap(SAMPLETYPE *output, const SAMPLETYPE *input, uint ovlPos) const;
+void calcSeqParameters();
+/// Changes the tempo of the given sound samples.
+/// Returns amount of samples returned in the "output" buffer.
+/// The maximum amount of samples that can be returned at a time is set by
+/// the 'set_returnBuffer_size' function.
+void processSamples();
+public:
+TDStretch();
+virtual ~TDStretch();
+/// 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.
+static void *operator new(size_t s);
+/// Use this function instead of "new" operator to create a new instance of this class.
+/// This function automatically chooses a correct feature set depending on if the CPU
+/// supports MMX/SSE/etc extensions.
+static TDStretch *newInstance();
+/// Returns the output buffer object
+FIFOSamplePipe *getOutput() { return &outputBuffer; };
+/// Returns the input buffer object
+FIFOSamplePipe *getInput() { return &inputBuffer; };
+/// Sets new target tempo. Normal tempo = 'SCALE', smaller values represent slower
+/// tempo, larger faster tempo.
+void setTempo(float newTempo);
+/// Returns nonzero if there aren't any samples available for outputting.
+virtual void clear();
+/// Clears the input buffer
+void clearInput();
+/// Sets the number of channels, 1 = mono, 2 = stereo
+void setChannels(int numChannels);
+/// Enables/disables the quick position seeking algorithm. Zero to disable,
+/// nonzero to enable
+void enableQuickSeek(bool enable);
+/// Returns nonzero if the quick seeking algorithm is enabled.
+bool isQuickSeekEnabled() const;
+/// Sets routine control parameters. These control are certain time constants
+/// defining how the sound is stretched to the desired duration.
+//
+/// 'sampleRate' = sample rate of the sound
+/// 'sequenceMS' = one processing sequence length in milliseconds
+/// 'seekwindowMS' = seeking window length for scanning the best overlapping
+///      position
+/// 'overlapMS' = overlapping length
+void setParameters(int sampleRate,          ///< Samplerate of sound being processed (Hz)
+int sequenceMS = -1,     ///< Single processing sequence length (ms)
+int seekwindowMS = -1,   ///< Offset seeking window length (ms)
+int overlapMS = -1       ///< Sequence overlapping length (ms)
+);
+/// Get routine control parameters, see setParameters() function.
+/// Any of the parameters to this function can be NULL, in such case corresponding parameter
+/// value isn't returned.
+void getParameters(int *pSampleRate, int *pSequenceMs, int *pSeekWindowMs, int *pOverlapMs) const;
+/// Adds 'numsamples' pcs of samples from the 'samples' memory position into
+/// the input of the object.
+virtual void putSamples(
+const SAMPLETYPE *samples,  ///< Input sample data
+uint numSamples                         ///< Number of samples in 'samples' so that one sample
+///< contains both channels if stereo
+);
+/// return nominal input sample requirement for triggering a processing batch
+int getInputSampleReq() const
+{
+return (int)(nominalSkip + 0.5);
+}
+/// return nominal output sample amount when running a processing batch
+int getOutputBatchSize() const
+{
+return seekWindowLength - overlapLength;
+}
+};
+// Implementation-specific class declarations:
+#ifdef SOUNDTOUCH_ALLOW_MMX
+/// Class that implements MMX optimized routines for 16bit integer samples type.
+class TDStretchMMX : public TDStretch
+{
+protected:
+double calcCrossCorr(const short *mixingPos, const short *compare, double &norm) const;
+double calcCrossCorrAccumulate(const short *mixingPos, const short *compare, double &norm) const;
+virtual void overlapStereo(short *output, const short *input) const;
+virtual void clearCrossCorrState();
+};
+#endif /// SOUNDTOUCH_ALLOW_MMX
+#ifdef SOUNDTOUCH_ALLOW_SSE
+/// Class that implements SSE optimized routines for floating point samples type.
+class TDStretchSSE : public TDStretch
+{
+protected:
+double calcCrossCorr(const float *mixingPos, const float *compare, double &norm) const;
+double calcCrossCorrAccumulate(const float *mixingPos, const float *compare, double &norm) const;
+};
+#endif /// SOUNDTOUCH_ALLOW_SSE
+}
+#endif  /// TDStretch_H

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comparison: media/libsoundtouch/src/TDStretch.h

media/libsoundtouch/src/TDStretch.h