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Voicer.h

/***************************************************/
/*! \class Voicer
    \brief STK voice manager class.

    This class can be used to manage a group of
    STK instrument classes.  Individual voices can
    be controlled via unique note tags.
    Instrument groups can be controlled by channel
    number.

    A previously constructed STK instrument class
    is linked with a voice manager using the
    addInstrument() function.  An optional channel
    number argument can be specified to the
    addInstrument() function as well (default
    channel = 0).  The voice manager does not
    delete any instrument instances ... it is the
    responsibility of the user to allocate and
    deallocate all instruments.

    The tick() function returns the mix of all
    sounding voices.  Each noteOn returns a unique
    tag (credits to the NeXT MusicKit), so you can
    send control changes to specific voices within
    an ensemble.  Alternately, control changes can
    be sent to all voices on a given channel.

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

#ifndef STK_VOICER_H
#define STK_VOICER_H

#include "Instrmnt.h"
#include <vector>

00038 class Voicer : public Stk
{
public:
  //! Class constructor taking an optional note decay time (in seconds).
  Voicer( StkFloat decayTime=0.2 );

  //! Class destructor.
  ~Voicer();

  //! Add an instrument with an optional channel number to the voice manager.
  /*!
    A set of instruments can be grouped by channel number and
    controlled via the functions which take a channel number argument.
  */
  void addInstrument( Instrmnt *instrument, int channel=0 );

  //! Remove the given instrument pointer from the voice manager's control.
  /*!
    It is important that any instruments which are to be deleted by
    the user while the voice manager is running be first removed from
    the manager's control via this function!!
   */
  void removeInstrument( Instrmnt *instrument );

  //! Initiate a noteOn event with the given note number and amplitude and return a unique note tag.
  /*!
    Send the noteOn message to the first available unused voice.
    If all voices are sounding, the oldest voice is interrupted and
    sent the noteOn message.  If the optional channel argument is
    non-zero, only voices on that channel are used.  If no voices are
    found for a specified non-zero channel value, the function returns
    -1.  The amplitude value should be in the range 0.0 - 128.0.
  */
  long noteOn( StkFloat noteNumber, StkFloat amplitude, int channel=0 );

  //! Send a noteOff to all voices having the given noteNumber and optional channel (default channel = 0).
  /*!
    The amplitude value should be in the range 0.0 - 128.0.
  */
  void noteOff( StkFloat noteNumber, StkFloat amplitude, int channel=0 );

  //! Send a noteOff to the voice with the given note tag.
  /*!
    The amplitude value should be in the range 0.0 - 128.0.
  */
  void noteOff( long tag, StkFloat amplitude );

  //! Send a frequency update message to all voices assigned to the optional channel argument (default channel = 0).
  /*!
    The \e noteNumber argument corresponds to a MIDI note number, though it is a floating-point value and can range beyond the normal 0-127 range.
   */
  void setFrequency( StkFloat noteNumber, int channel=0 );

  //! Send a frequency update message to the voice with the given note tag.
  /*!
    The \e noteNumber argument corresponds to a MIDI note number, though it is a floating-point value and can range beyond the normal 0-127 range.
   */
  void setFrequency( long tag, StkFloat noteNumber );

  //! Send a pitchBend message to all voices assigned to the optional channel argument (default channel = 0).
  void pitchBend( StkFloat value, int channel=0 );

  //! Send a pitchBend message to the voice with the given note tag.
  void pitchBend( long tag, StkFloat value );

  //! Send a controlChange to all instruments assigned to the optional channel argument (default channel = 0).
  void controlChange( int number, StkFloat value, int channel=0 );

  //! Send a controlChange to the voice with the given note tag.
  void controlChange( long tag, int number, StkFloat value );

  //! Send a noteOff message to all existing voices.
  void silence( void );

  //! Mix the output for all sounding voices.
  StkFloat tick();

  //! Compute \e vectorSize output mixes and return them in \e vector.
  StkFloat *tick(StkFloat *vector, unsigned int vectorSize);

  //! Fill a channel of the StkFrames object with computed outputs.
  /*!
    The \c channel argument should be one or greater (the first
    channel is specified by 1).  An StkError will be thrown if the \c
    channel argument is zero or it is greater than the number of
    channels in the StkFrames object.
  */
  virtual StkFrames& tick( StkFrames& frames, unsigned int channel = 1 );

  //! Return the last output value.
  StkFloat lastOut() const;

  //! Return the last left output value.
  StkFloat lastOutLeft() const;

  //! Return the last right output value.
  StkFloat lastOutRight() const;

protected:

  struct Voice {
    Instrmnt *instrument;
    long tag;
    StkFloat noteNumber;
    StkFloat frequency;
    int sounding;
    int channel;

    // Default constructor.
    Voice()
      :instrument(0), tag(0), noteNumber(-1.0), frequency(0.0),
         sounding(0), channel(0) {}
  };

  std::vector<Voice> voices_;
  long tags_;
  int muteTime_;
  StkFloat lastOutput_;
  StkFloat lastOutputLeft_;
  StkFloat lastOutputRight_;
};

#endif

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