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130 lines
3.5 KiB
C++
130 lines
3.5 KiB
C++
#ifndef STK_DRUMMER_H
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#define STK_DRUMMER_H
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#include "Instrmnt.h"
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#include "FileWvIn.h"
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#include "OnePole.h"
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namespace stk {
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/***************************************************/
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/*! \class Drummer
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\brief STK drum sample player class.
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This class implements a drum sampling
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synthesizer using WvIn objects and one-pole
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filters. The drum rawwave files are sampled
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at 22050 Hz, but will be appropriately
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interpolated for other sample rates. You can
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specify the maximum polyphony (maximum number
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of simultaneous voices) via a #define in the
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Drummer.h.
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by Perry R. Cook and Gary P. Scavone, 1995-2012.
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*/
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/***************************************************/
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const int DRUM_NUMWAVES = 11;
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const int DRUM_POLYPHONY = 4;
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class Drummer : public Instrmnt
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{
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public:
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//! Class constructor.
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/*!
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An StkError will be thrown if the rawwave path is incorrectly set.
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*/
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Drummer( void );
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//! Class destructor.
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~Drummer( void );
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//! Start a note with the given drum type and amplitude.
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/*!
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Use general MIDI drum instrument numbers, converted to
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frequency values as if MIDI note numbers, to select a particular
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instrument. An StkError will be thrown if the rawwave path is
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incorrectly set.
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*/
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void noteOn( StkFloat instrument, StkFloat amplitude );
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//! Stop a note with the given amplitude (speed of decay).
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void noteOff( StkFloat amplitude );
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//! Compute and return one output sample.
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StkFloat tick( unsigned int channel = 0 );
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//! Fill a channel of the StkFrames object with computed outputs.
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/*!
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The \c channel argument must be less than the number of
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channels in the StkFrames argument (the first channel is specified
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by 0). However, range checking is only performed if _STK_DEBUG_
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is defined during compilation, in which case an out-of-range value
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will trigger an StkError exception.
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*/
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StkFrames& tick( StkFrames& frames, unsigned int channel = 0 );
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protected:
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FileWvIn waves_[DRUM_POLYPHONY];
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OnePole filters_[DRUM_POLYPHONY];
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std::vector<int> soundOrder_;
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std::vector<int> soundNumber_;
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int nSounding_;
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};
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inline StkFloat Drummer :: tick( unsigned int )
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{
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lastFrame_[0] = 0.0;
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if ( nSounding_ == 0 ) return lastFrame_[0];
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for ( int i=0; i<DRUM_POLYPHONY; i++ ) {
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if ( soundOrder_[i] >= 0 ) {
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if ( waves_[i].isFinished() ) {
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// Re-order the list.
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for ( int j=0; j<DRUM_POLYPHONY; j++ ) {
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if ( soundOrder_[j] > soundOrder_[i] )
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soundOrder_[j] -= 1;
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}
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soundOrder_[i] = -1;
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nSounding_--;
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}
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else
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lastFrame_[0] += filters_[i].tick( waves_[i].tick() );
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}
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}
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return lastFrame_[0];
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}
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inline StkFrames& Drummer :: tick( StkFrames& frames, unsigned int channel )
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{
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unsigned int nChannels = lastFrame_.channels();
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#if defined(_STK_DEBUG_)
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if ( channel > frames.channels() - nChannels ) {
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oStream_ << "Drummer::tick(): channel and StkFrames arguments are incompatible!";
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handleError( StkError::FUNCTION_ARGUMENT );
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}
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#endif
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StkFloat *samples = &frames[channel];
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unsigned int j, hop = frames.channels() - nChannels;
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if ( nChannels == 1 ) {
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for ( unsigned int i=0; i<frames.frames(); i++, samples += hop )
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*samples++ = tick();
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}
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else {
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for ( unsigned int i=0; i<frames.frames(); i++, samples += hop ) {
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*samples++ = tick();
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for ( j=1; j<nChannels; j++ )
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*samples++ = lastFrame_[j];
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}
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}
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return frames;
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}
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} // stk namespace
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#endif
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