git ssb

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#include <math.h>
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#include <malloc.h>
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#include "tune.h"
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#include "foobuf.h"
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static float keymap[256] = {0};
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float play(void *obj, double time, float in, unsigned char midi_cmd[3])
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{
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	struct {
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		struct foobuf *buf;
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		float *keymap;
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	} *state = obj;
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	struct_init(&state);
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	// foobuf_init(&state->buf, 48000);
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	// array_init(&state->keymap, 256);
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	/*
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	static float keymap[256];
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	if (!state->keymap) {
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		state->keymap = keymap;
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		for (size_t i = 0; i < 256; i++) keymap[i] = 0;
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	}
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	*/
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	float out = 0;
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	if (midi_cmd) {
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		// float val = sin(2. * M_PI * (float)i/buf_size * freq);
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		if (midi_cmd[0] == 0x90) {
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			keymap[midi_cmd[1]] = (float)midi_cmd[2]/255.;
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		} else if (midi_cmd[0] == 0x90) {
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			keymap[midi_cmd[1]] = 0;
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		} else {
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			// printf("midi %x %x %x\n", buf[0], buf[1], buf[2]);
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		}
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		for (size_t i = 0; i < 256; i++) {
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			float val = keymap[i];
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			if (val > 0.01) {
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				float freq = exp2f((float)(i-69) / 12);
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				out += sin(2. * M_PI * time * freq);
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				printf("i %zu %f %f\n", i, (double)freq, val);
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				keymap[i] /= 2;
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			}
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		}
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	}
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	// return sin(2. * M_PI * time * 440.) * 0.25 + in * 0.75;
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	// float out = in*0.5 + foobuf_read(state->buf, 0)*0.5;
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	// foobuf_read(state->buf, 0)*0.5;
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	// float out2 = in*0.5 + out*0.5;
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	// foobuf_write(state->buf, out);
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	return out;
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}
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