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101 lines
2.7 KiB
101 lines
2.7 KiB
4 years ago
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#pragma once
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#ifndef DSY_PLUCK_H
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#define DSY_PLUCK_H
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#include <stdint.h>
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#ifdef __cplusplus
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namespace daisysp
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{
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/** The method of natural decay that the algorithm will use.
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- RECURSIVE: 1st order recursive filter, with coefs .5.
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- WEIGHTED_AVERAGE: weighted averaging.
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*/
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enum
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{
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PLUCK_MODE_RECURSIVE,
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PLUCK_MODE_WEIGHTED_AVERAGE,
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PLUCK_LAST,
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};
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/** Produces a naturally decaying plucked string or drum sound based on the Karplus-Strong algorithms.
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Ported from soundpipe to DaisySP
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This code was originally extracted from the Csound opcode "pluck"
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Original Author(s): Barry Vercoe, John ffitch
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Year: 1991
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Location: OOps/ugens4.c
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*/
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class Pluck
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{
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public:
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Pluck() {}
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~Pluck() {}
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/** Initializes the Pluck module.
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\param sample_rate: Sample rate of the audio engine being run.
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\param buf: buffer used as an impulse when triggering the Pluck algorithm
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\param npt: number of elementes in buf.
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\param mode: Sets the mode of the algorithm.
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*/
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void Init(float sample_rate, float *buf, int32_t npt, int32_t mode);
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/** Processes the waveform to be generated, returning one sample. This should be called once per sample period.
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*/
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float Process(float &trig);
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/**
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Sets the amplitude of the output signal.
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Input range: 0-1?
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*/
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inline void SetAmp(float amp) { amp_ = amp; }
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/** Sets the frequency of the output signal in Hz.
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Input range: Any positive value
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*/
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inline void SetFreq(float freq) { freq_ = freq; }
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/** Sets the time it takes for a triggered note to end in seconds.
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Input range: 0-1
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*/
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inline void SetDecay(float decay) { decay_ = decay; }
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/** Sets the dampening factor applied by the filter (based on PLUCK_MODE)
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Input range: 0-1
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*/
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inline void SetDamp(float damp) { damp_ = damp; }
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/** Sets the mode of the algorithm.
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*/
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inline void SetMode(int32_t mode) { mode_ = mode; }
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/** Returns the current value for amp.
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*/
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inline float GetAmp() { return amp_; }
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/** Returns the current value for freq.
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*/
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inline float GetFreq() { return freq_; }
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/** Returns the current value for decay.
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*/
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inline float GetDecay() { return decay_; }
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/** Returns the current value for damp.
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*/
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inline float GetDamp() { return damp_; }
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/** Returns the current value for mode.
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*/
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inline int32_t GetMode() { return mode_; }
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private:
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void Reinit();
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float amp_, freq_, decay_, damp_, ifreq_;
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float sicps_;
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int32_t phs256_, npts_, maxpts_;
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float * buf_;
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float sample_rate_;
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char init_;
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int32_t mode_;
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};
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} // namespace daisysp
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#endif
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#endif
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