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#include <math.h>
#include <stdio.h>
#include <string.h>
#include <err.h>
#include <jack/jack.h>
#include <jack/ringbuffer.h>
#include <rtosc/rtosc.h>
#define OFF (0)
//Shape of oscillator
//0 - sinusoidal
//1 - sawtooth
//2 - rectangular (25% duty cycle)
static int shape = 0;
//Current frequency
static float freq = 440.0f;
//Whether the note is running or not
static bool gate = OFF;
//Synthesis
float get_sample(const float phase)
{
if(shape == 0)
return sin(phase*2*M_PI);
else if(shape == 1)
return phase*2.0f-1.0f;
else if(shape == 2)
return phase > 0.75 ? 1.0 : 0.0f;
return 0.0f;
}
//OSC
static char dsp_osc_buf[2048];
extern char gui_osc_buf[];
void gui_message(const char *msg);
#define message(path, type, ...) do { \
if(rtosc_message(dsp_osc_buf, 2048, path, ...)) \
gui_message(dsp_osc_buf); \
else \
warnx("Message to %s is too long...", path);\
}
//Setter functions
#define setter(type_ch, type) void type_ch##setter(const char *osc_msg, void *param) { \
*((type*)param) = rtosc_argument(osc_msg, 0).type_ch; \
}
setter(i,int);
setter(f,float);
setter(T,bool);
void plot_data_cb(const char *msg, void*)
{
const int samples = rtosc_argument(msg, 0).i;
//Construct blob piecewise
if(rtosc_message(dsp_osc_buf, 2048, "/ui/plot", "b", samples, NULL)) {
//Fill reserved space
float *data = (float*) rtosc_argument(dsp_osc_buf,0).b.data;
for(int i=0; i < samples; ++i)
data[i] = get_sample((float)i/samples);
}
gui_message(dsp_osc_buf);
}
struct dispatch_t
{
const char *label;
void (*fn)(const char *,void*);
void *data;
};
//Simple dispatch table
dispatch_t dispatch_table[] = {
{"/synth/shape", isetter, &shape},
{"/synth/freq", fsetter, &freq},
{"/synth/gate", Tsetter, &gate},
{"/synth/plot/data", plot_data_cb, 0},
{0,0,0}
};
void dsp_dispatch(const char *msg)
{
dispatch_t *itr = dispatch_table;
while(itr->label && strcmp(msg, itr->label))
++itr;
if(itr->label)
itr->fn(msg, itr->data);
}
//JACK stuff
jack_port_t *jport;
jack_client_t *jclient;
jack_ringbuffer_t *gui_ring;
jack_ringbuffer_t *dsp_ring;
int process(unsigned nframes, void *args);
void dsp_ev(void);
void gui_dispatch(const char *msg);
void dsp_message(const char *msg)
{
if(jack_ringbuffer_write_space(dsp_ring) >= 2048)
jack_ringbuffer_write(dsp_ring, msg, 2048);
else
puts("dsp ringbuffer full...");
}
void gui_message(const char *msg)
{
if(jack_ringbuffer_write_space(gui_ring) >= 2048)
jack_ringbuffer_write(gui_ring, msg, 2048);
}
void dsp_ev(void)
{
while(jack_ringbuffer_read_space(dsp_ring) >= 2048) {
jack_ringbuffer_read(dsp_ring, dsp_osc_buf, 2048);
dsp_dispatch(dsp_osc_buf);
}
}
void gui_ev(void)
{
while(jack_ringbuffer_read_space(gui_ring) >= 2048) {
jack_ringbuffer_read(gui_ring, gui_osc_buf, 2048);
gui_dispatch(gui_osc_buf);
}
}
void start_synth(void)
{
//Setup Ringbuffers
gui_ring = jack_ringbuffer_create(2048*8);
dsp_ring = jack_ringbuffer_create(2048*32);
jack_ringbuffer_mlock(gui_ring);
jack_ringbuffer_mlock(dsp_ring);
jclient = jack_client_open("rtosc-demo", JackNullOption, NULL, NULL);
if(!jclient)
errx(1, "jack_client_open() failure");
jack_set_process_callback(jclient, process, NULL);
jport = jack_port_register(jclient, "output",
JACK_DEFAULT_AUDIO_TYPE, JackPortIsOutput | JackPortIsTerminal, 0);
if(!jport)
errx(1, "jack_port_register() failure");
if(jack_activate(jclient))
errx(1, "jack_activate() failure");
}
void stop_synth(void)
{
jack_client_close(jclient);
}
float phase = 0.0f;
int process(unsigned nframes, void *)
{
dsp_ev();
float *smps = (float*) jack_port_get_buffer(jport, nframes);
memset(smps, 0, nframes*sizeof(float));
const float dp = freq/jack_get_sample_rate(jclient);
for(unsigned i=0; i<nframes; ++i) {
smps[i] = get_sample(phase);
phase += dp;
if(phase > 1.0f)
phase -= 1.0f;
}
return 0;
}
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