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RtWvOut.h

/***************************************************/
/*! \class RtWvOut
    \brief STK realtime audio (blocking) output class.

    This class provides a simplified interface to RtAudio for realtime
    audio output.  It is a subclass of WvOut.  Because this class
    makes use of RtAudio's blocking output routines, its performance
    is less robust on systems where the audio API is callback-based
    (Macintosh CoreAudio and Windows ASIO).

    RtWvOut supports multi-channel data in interleaved format.  It is
    important to distinguish the tick() methods, which output single
    samples to all channels in a sample frame, from the tickFrame()
    method, which take a pointer or reference to multi-channel sample
    frame data.

    by Perry R. Cook and Gary P. Scavone, 1995 - 2005.
*/
/***************************************************/

#ifndef STK_RTWVOUT_H
#define STK_RTWVOUT_H

#include "WvOut.h"
#include "RtAudio.h"

00027 class RtWvOut : public WvOut
{
 public:

  //! Default constructor.
  /*!
    The \e device argument is passed to RtAudio during
    instantiation.  The default value (zero) will select the default
    device on your system or the first device found meeting the
    specified parameters.  On systems with multiple
    soundcards/devices, values greater than zero can be specified in
    accordance with the order that the devices are enumerated by the
    underlying audio API.  The default buffer size of RT_BUFFER_SIZE
    is defined in Stk.h.  An StkError will be thrown if an error
    occurs duing instantiation.
  */
  RtWvOut( unsigned int nChannels = 1, StkFloat sampleRate = Stk::sampleRate(),
           int device = 0, int bufferFrames = RT_BUFFER_SIZE, int nBuffers = 4 );

  //! Class destructor.
  ~RtWvOut();

  //! Start the audio output stream.
  /*!
    The stream is started automatically, if necessary, when a
    tick() or tickFrame method is called.
  */
  void start(void);

  //! Stop the audio output stream.
  /*!
    It may be necessary to use this method to avoid undesireable
    audio buffer cycling if you wish to temporarily stop audio output.
  */
  void stop(void);

 protected:

  void computeSample( const StkFloat sample );

  void computeFrames( const StkFrames& frames );

  void incrementFrame( void );

  RtAudio *dac_;
  StkFloat *buffer_;
  bool stopped_;
  unsigned int nChannels_;
  unsigned int bufferIndex_;
  unsigned int iBuffer_;
  unsigned int bufferFrames_;

};

#endif

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