The Tor Browser: media/libsoundtouch/src/SoundTouch.h@97036ab72558 (annotated)

media/libsoundtouch/src/SoundTouch.h@97036ab72558 (annotated)

media/libsoundtouch/src/SoundTouch.h

Tue, 06 Jan 2015 21:39:09 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Tue, 06 Jan 2015 21:39:09 +0100
branch: TOR_BUG_9701
changeset 8: 97036ab72558
permissions: -rw-r--r--

Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

 //////////////////////////////////////////////////////////////////////////////
 ///
 /// SoundTouch - main class for tempo/pitch/rate adjusting routines.
 ///
 /// Notes:
 /// - Initialize the SoundTouch object instance by setting up the sound stream
 ///   parameters with functions 'setSampleRate' and 'setChannels', then set
 ///   desired tempo/pitch/rate settings with the corresponding functions.
 ///
 /// - The SoundTouch class behaves like a first-in-first-out pipeline: The
 ///   samples that are to be processed are fed into one of the pipe by calling
 ///   function 'putSamples', while the ready processed samples can be read
 ///   from the other end of the pipeline with function 'receiveSamples'.
 ///
 /// - The SoundTouch processing classes require certain sized 'batches' of
 ///   samples in order to process the sound. For this reason the classes buffer
 ///   incoming samples until there are enough of samples available for
 ///   processing, then they carry out the processing step and consequently
 ///   make the processed samples available for outputting.
 ///
 /// - For the above reason, the processing routines introduce a certain
 ///   'latency' between the input and output, so that the samples input to
 ///   SoundTouch may not be immediately available in the output, and neither
 ///   the amount of outputtable samples may not immediately be in direct
 ///   relationship with the amount of previously input samples.
 ///
 /// - The tempo/pitch/rate control parameters can be altered during processing.
 ///   Please notice though that they aren't currently protected by semaphores,
 ///   so in multi-thread application external semaphore protection may be
 ///   required.
 ///
 /// - This class utilizes classes 'TDStretch' for tempo change (without modifying
 ///   pitch) and 'RateTransposer' for changing the playback rate (that is, both
 ///   tempo and pitch in the same ratio) of the sound. The third available control
 ///   'pitch' (change pitch but maintain tempo) is produced by a combination of
 ///   combining the two other controls.
 ///
 /// 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: SoundTouch.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 SoundTouch_H
 #define SoundTouch_H
 #include "FIFOSamplePipe.h"
 #include "STTypes.h"
 namespace soundtouch
 {
 /// Soundtouch library version string
 #define SOUNDTOUCH_VERSION          "1.8.0"
 /// SoundTouch library version id
 #define SOUNDTOUCH_VERSION_ID       (10800)
 //
 // Available setting IDs for the 'setSetting' & 'get_setting' functions:
 /// Enable/disable anti-alias filter in pitch transposer (0 = disable)
 #define SETTING_USE_AA_FILTER       0
 /// Pitch transposer anti-alias filter length (8 .. 128 taps, default = 32)
 #define SETTING_AA_FILTER_LENGTH    1
 /// Enable/disable quick seeking algorithm in tempo changer routine
 /// (enabling quick seeking lowers CPU utilization but causes a minor sound
 ///  quality compromising)
 #define SETTING_USE_QUICKSEEK       2
 /// Time-stretch algorithm single processing sequence length in milliseconds. This determines
 /// to how long sequences the original sound is chopped in the time-stretch algorithm.
 /// See "STTypes.h" or README for more information.
 #define SETTING_SEQUENCE_MS         3
 /// Time-stretch algorithm seeking window 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.
 /// See "STTypes.h" or README for more information.
 #define SETTING_SEEKWINDOW_MS       4
 /// Time-stretch algorithm 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.
 /// See "STTypes.h" or README for more information.
 #define SETTING_OVERLAP_MS          5
 /// Call "getSetting" with this ID to query nominal average processing sequence
 /// size in samples. This value tells approcimate value how many input samples
 /// SoundTouch needs to gather before it does DSP processing run for the sample batch.
 ///
 /// Notices:
 /// - This is read-only parameter, i.e. setSetting ignores this parameter
 /// - Returned value is approximate average value, exact processing batch
 ///   size may wary from time to time
 /// - This parameter value is not constant but may change depending on
 ///   tempo/pitch/rate/samplerate settings.
 #define SETTING_NOMINAL_INPUT_SEQUENCE		6
 /// Call "getSetting" with this ID to query nominal average processing output
 /// size in samples. This value tells approcimate value how many output samples
 /// SoundTouch outputs once it does DSP processing run for a batch of input samples.
 ///
 /// Notices:
 /// - This is read-only parameter, i.e. setSetting ignores this parameter
 /// - Returned value is approximate average value, exact processing batch
 ///   size may wary from time to time
 /// - This parameter value is not constant but may change depending on
 ///   tempo/pitch/rate/samplerate settings.
 #define SETTING_NOMINAL_OUTPUT_SEQUENCE		7
 class EXPORT SoundTouch : public FIFOProcessor
 {
 private:
     /// Rate transposer class instance
     class RateTransposer *pRateTransposer;
     /// Time-stretch class instance
     class TDStretch *pTDStretch;
     /// Virtual pitch parameter. Effective rate & tempo are calculated from these parameters.
     float virtualRate;
     /// Virtual pitch parameter. Effective rate & tempo are calculated from these parameters.
     float virtualTempo;
     /// Virtual pitch parameter. Effective rate & tempo are calculated from these parameters.
     float virtualPitch;
     /// Flag: Has sample rate been set?
     bool  bSrateSet;
     /// Calculates effective rate & tempo valuescfrom 'virtualRate', 'virtualTempo' and
     /// 'virtualPitch' parameters.
     void calcEffectiveRateAndTempo();
 protected :
     /// Number of channels
     uint  channels;
     /// Effective 'rate' value calculated from 'virtualRate', 'virtualTempo' and 'virtualPitch'
     float rate;
     /// Effective 'tempo' value calculated from 'virtualRate', 'virtualTempo' and 'virtualPitch'
     float tempo;
 public:
     SoundTouch();
     virtual ~SoundTouch();
     /// Get SoundTouch library version string
     static const char *getVersionString();
     /// Get SoundTouch library version Id
     static uint getVersionId();
     /// Sets new rate control value. Normal rate = 1.0, smaller values
     /// represent slower rate, larger faster rates.
     void setRate(float newRate);
     /// Sets new tempo control value. Normal tempo = 1.0, smaller values
     /// represent slower tempo, larger faster tempo.
     void setTempo(float newTempo);
     /// Sets new rate control value as a difference in percents compared
     /// to the original rate (-50 .. +100 %)
     void setRateChange(float newRate);
     /// Sets new tempo control value as a difference in percents compared
     /// to the original tempo (-50 .. +100 %)
     void setTempoChange(float newTempo);
     /// Sets new pitch control value. Original pitch = 1.0, smaller values
     /// represent lower pitches, larger values higher pitch.
     void setPitch(float newPitch);
     /// Sets pitch change in octaves compared to the original pitch
     /// (-1.00 .. +1.00)
     void setPitchOctaves(float newPitch);
     /// Sets pitch change in semi-tones compared to the original pitch
     /// (-12 .. +12)
     void setPitchSemiTones(int newPitch);
     void setPitchSemiTones(float newPitch);
     /// Sets the number of channels, 1 = mono, 2 = stereo
     void setChannels(uint numChannels);
     /// Sets sample rate.
     void setSampleRate(uint srate);
     /// Flushes the last samples from the processing pipeline to the output.
     /// Clears also the internal processing buffers.
     //
     /// Note: This function is meant for extracting the last samples of a sound
     /// stream. This function may introduce additional blank samples in the end
     /// of the sound stream, and thus it's not recommended to call this function
     /// in the middle of a sound stream.
     void flush();
     /// Adds 'numSamples' pcs of samples from the 'samples' memory position into
     /// the input of the object. Notice that sample rate _has_to_ be set before
     /// calling this function, otherwise throws a runtime_error exception.
     virtual void putSamples(
             const SAMPLETYPE *samples,  ///< Pointer to sample buffer.
             uint numSamples                         ///< Number of samples in buffer. Notice
                                                     ///< that in case of stereo-sound a single sample
                                                     ///< contains data for both channels.
             );
     /// Clears all the samples in the object's output and internal processing
     /// buffers.
     virtual void clear();
     /// Changes a setting controlling the processing system behaviour. See the
     /// 'SETTING_...' defines for available setting ID's.
     ///
     /// \return 'true' if the setting was succesfully changed
     bool setSetting(int settingId,   ///< Setting ID number. see SETTING_... defines.
                     int value        ///< New setting value.
                     );
     /// Reads a setting controlling the processing system behaviour. See the
     /// 'SETTING_...' defines for available setting ID's.
     ///
     /// \return the setting value.
     int getSetting(int settingId    ///< Setting ID number, see SETTING_... defines.
                    ) const;
     /// Returns number of samples currently unprocessed.
     virtual uint numUnprocessedSamples() const;
     /// Other handy functions that are implemented in the ancestor classes (see
     /// classes 'FIFOProcessor' and 'FIFOSamplePipe')
     ///
     /// - receiveSamples() : Use this function to receive 'ready' processed samples from SoundTouch.
     /// - numSamples()     : Get number of 'ready' samples that can be received with
     ///                      function 'receiveSamples()'
     /// - isEmpty()        : Returns nonzero if there aren't any 'ready' samples.
     /// - clear()          : Clears all samples from ready/processing buffers.
 };
 }
 #endif

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media/libsoundtouch/src/SoundTouch.h@97036ab72558 (annotated)

media/libsoundtouch/src/SoundTouch.h