prosperon/source/engine/dsp.h

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#ifndef DSP_H
#define DSP_H
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#define SAMPLERATE 48000
#define BUF_FRAMES 4096
#define CHANNELS 2
#define MUSIZE 2
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#include "circbuf.h"
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void dsp_rectify(short *in, short *out, int n);
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struct dsp_filter {
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void (*filter)(void *data, short *out, int samples);
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void *data;
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int inputs;
struct dsp_filter *in[6];
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short cache[CHANNELS*BUF_FRAMES];
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int dirty;
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};
struct dsp_fir {
float freq;
int n;
int head;
float *cof;
float *dx;
struct dsp_filter in;
};
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void dsp_filter_addin(struct dsp_filter filter, struct dsp_filter *in);
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struct dsp_filter lp_fir_make(float freq);
void dsp_iir_fillbuf(struct dsp_iir *iir, short *out, int n);
struct dsp_filter hpf_make(int poles, float freq);
struct dsp_filter lpf_make(int poles, float freq);
struct dsp_filter bpf_make(int poles, float freq1, float freq2);
struct dsp_filter npf_make(int poles, float freq1, float freq2);
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/* atk, dec, sus, rls specify the time, in miliseconds, the phase begins */
struct dsp_adsr {
unsigned int atk;
double atk_t;
unsigned int dec;
double dec_t;
unsigned int sus;
float sus_pwr; // Between 0 and 1
unsigned int rls;
double rls_t;
double time; /* Current time of the filter */
float out;
};
void dsp_adsr_fillbuf(struct dsp_adsr *adsr, short *out, int n);
struct dsp_filter make_adsr(unsigned int atk, unsigned int dec, unsigned int sus, unsigned int rls);
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struct dsp_delay {
unsigned int ms_delay;
struct circbuf buf;
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struct dsp_filter in;
};
struct dsp_delay dsp_delay_make(unsigned int ms_delay);
void dsp_delay_filbuf(struct dsp_delay *delay, short *buf, int n);
struct dsp_ammod {
struct dsp_filter ina;
struct dsp_filter inb;
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short abuf[BUF_FRAMES*CHANNELS];
short bbuf[BUF_FRAMES*CHANNELS];
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};
struct dsp_compressor {
};
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struct dsp_filter dsp_make_compressor();
void dsp_compressor_fillbuf(struct dsp_compressor *comp, short *out, int n);
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struct dsp_limiter {
};
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struct dsp_filter dsp_make_limiter();
void dsp_limiter_fillbuf(struct dsp_limiter *lim, short *out, int n);
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struct phasor {
unsigned int sr;
float cur;
float freq;
unsigned int clen;
unsigned int cstep;
float *cache;
};
struct phasor phasor_make(unsigned int sr, float freq);
struct osc {
float (*f)(float p);
struct phasor p;
unsigned int frames;
unsigned int frame;
short *cache;
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};
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struct wav;
struct wav gen_sine(float amp, float freq, int sr, int ch);
struct wav gen_square(float amp, float freq, int sr, int ch);
struct wav gen_triangle(float amp, float freq, int sr, int ch);
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struct wav gen_saw(float amp, float freq, int sr, int ch);
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void gen_whitenoise(void *data, short *out, int n);
void gen_pinknoise(void *data, short *out, int n);
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float sin_phasor(float p);
float square_phasor(float p);
float saw_phasor(float p);
float tri_phasor(float p);
void osc_fillbuf(struct osc *osc, short *buf, int n);
void am_mod(struct dsp_ammod *mod, short *c, int n);
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struct dsp_reverb {
unsigned int time; /* Time in miliseconds for the sound to decay out */
};
struct dsp_filter make_reverb();
void dsp_reverb_fillbuf(struct dsp_reverb *r, short *out, int n);
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#endif