159 lines
3.6 KiB
C
159 lines
3.6 KiB
C
#ifndef DSP_H
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#define DSP_H
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#define SAMPLERATE 48000
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#define BUF_FRAMES 128 /* At 48k, 128 needed for 240fps consistency */
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#define CHANNELS 2
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#include "circbuf.h"
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struct dsp_iir;
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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;
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struct dsp_filter *in[6];
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short cache[CHANNELS*BUF_FRAMES];
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int dirty;
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};
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struct dsp_filter dsp_filter(void *data, void (*filter)(void *data, short *out, int samples));
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struct dsp_fir {
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float freq;
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int n;
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int head;
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float *cof;
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float *dx;
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struct dsp_filter in;
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};
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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);
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void dsp_iir_fillbuf(struct dsp_iir *iir, short *out, int n);
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struct dsp_filter hpf_make(int poles, float freq);
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struct dsp_filter lpf_make(int poles, float freq);
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struct dsp_filter bpf_make(int poles, float freq1, float freq2);
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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 */
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struct dsp_adsr {
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unsigned int atk;
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double atk_t;
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unsigned int dec;
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double dec_t;
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unsigned int sus;
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float sus_pwr; // Between 0 and 1
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unsigned int rls;
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double rls_t;
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double time; /* Current time of the filter */
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float out;
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};
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void dsp_adsr_fillbuf(struct dsp_adsr *adsr, short *out, int n);
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struct dsp_filter make_adsr(unsigned int atk, unsigned int dec, unsigned int sus, unsigned int rls);
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struct dsp_delay {
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unsigned int ms_delay;
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struct circbuf buf;
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struct dsp_filter in;
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};
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struct dsp_delay dsp_delay_make(unsigned int ms_delay);
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void dsp_delay_filbuf(struct dsp_delay *delay, short *buf, int n);
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struct dsp_ammod {
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struct dsp_filter ina;
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struct dsp_filter inb;
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short abuf[BUF_FRAMES*CHANNELS];
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short bbuf[BUF_FRAMES*CHANNELS];
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};
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struct dsp_compressor {
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double ratio;
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double threshold;
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float target;
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unsigned int atk; /* Milliseconds */
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double atk_tau;
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unsigned int rls; /* MIlliseconds */
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double rls_tau;
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};
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struct dsp_filter dsp_make_compressor();
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void dsp_compressor_fillbuf(struct dsp_compressor *comp, short *out, int n);
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struct dsp_limiter {
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};
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struct dsp_filter dsp_make_limiter();
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void dsp_limiter_fillbuf(struct dsp_limiter *lim, short *out, int n);
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struct phasor {
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unsigned int sr;
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float cur;
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float freq;
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unsigned int clen;
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unsigned int cstep;
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float *cache;
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};
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struct phasor phasor_make(unsigned int sr, float freq);
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struct osc {
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float (*f)(float p);
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struct phasor p;
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unsigned int frames;
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unsigned int frame;
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short *cache;
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};
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struct wav;
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struct wav gen_sine(float amp, float freq, int sr, int ch);
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struct wav gen_square(float amp, float freq, int sr, int ch);
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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);
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void gen_pinknoise(void *data, short *out, int n);
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float sin_phasor(float p);
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float square_phasor(float p);
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float saw_phasor(float p);
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float tri_phasor(float p);
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void osc_fillbuf(struct osc *osc, short *buf, int n);
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void am_mod(struct dsp_ammod *mod, short *c, int n);
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struct dsp_reverb {
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unsigned int time; /* Time in miliseconds for the sound to decay out */
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};
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struct dsp_filter make_reverb();
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void dsp_reverb_fillbuf(struct dsp_reverb *r, short *out, int n);
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void dsp_pan(float *deg, short *out, int n);
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void dsp_mono(void *p, short *out, int n);
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void dsp_bitcrush(void *p, short *out, int n);
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void dsp_run(struct dsp_filter filter, short *out, int n);
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#endif
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