libs/rubberband/rubberband/TimeStretcher.h

   1 /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
   2
   3 /*
   4     Rubber Band
   5     An audio time-stretching and pitch-shifting library.
   6     Copyright 2007 Chris Cannam.
   7
   8     This program is free software; you can redistribute it and/or
   9     modify it under the terms of the GNU General Public License as
  10     published by the Free Software Foundation; either version 2 of the
  11     License, or (at your option) any later version.  See the file
  12     COPYING included with this distribution for more information.
  13 */
  14
  15 #ifndef _RUBBERBAND_TIMESTRETCHER_H_
  16 #define _RUBBERBAND_TIMESTRETCHER_H_
  17
  18 #include <sys/types.h>
  19
  20 namespace RubberBand
  21 {
  22
  23 /**
  24  * Base class for time stretchers.  RubberBand currently provides only
  25  * a single subclass implementation.
  26  *
  27  * @see RubberBandStretcher
  28  */
  29 class TimeStretcher
  30 {
  31 public:
  32     TimeStretcher(size_t sampleRate, size_t channels) :
  33         m_sampleRate(sampleRate),
  34         m_channels(channels)
  35     { }
  36     virtual ~TimeStretcher()
  37     { }
  38
  39     virtual void reset() = 0;
  40     virtual void setTimeRatio(double ratio) = 0;
  41     virtual void setPitchScale(double scale) = 0;
  42     virtual size_t getLatency() const = 0;
  43
  44     virtual void study(const float *const *input, size_t samples, bool final) = 0;
  45     virtual size_t getSamplesRequired() const = 0;
  46     virtual void process(const float *const *input, size_t samples, bool final) = 0;
  47     virtual int available() const = 0;
  48     virtual size_t retrieve(float *const *output, size_t samples) const = 0;
  49
  50 protected:
  51     size_t m_sampleRate;
  52     size_t m_channels;
  53 };
  54
  55 }
  56
  57 #endif
  58