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#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <err.h>
#include <jack/jack.h>
#include <jack/midiport.h>
extern float Fs;
extern float &freq;
extern bool &gate;
void process_output(float *f, unsigned nframes);
int current_note = 0;
void dsp_dispatch(const char *msg);
//JACK stuff
jack_port_t *port, *iport;
jack_client_t *client;
int process(unsigned nframes, void *args);
void synth_init(void);
void audio_cleanup(void)
{
puts("Exiting jack...");
jack_deactivate(client);
jack_client_close(client);
}
void audio_init(void)
{
synth_init();
client = jack_client_open("rtosc-demo2", JackNullOption, NULL, NULL);
if(!client)
errx(1, "jack_client_open() failure");
jack_set_process_callback(client, process, NULL);
port = jack_port_register(client, "output",
JACK_DEFAULT_AUDIO_TYPE, JackPortIsOutput | JackPortIsTerminal, 0);
//Make midi port
iport = jack_port_register(client, "input",
JACK_DEFAULT_MIDI_TYPE, JackPortIsInput | JackPortIsTerminal, 0);
if(!port)
errx(1, "jack_port_register() failure");
if(jack_activate(client))
errx(1, "jack_activate() failure");
atexit(audio_cleanup);
}
void process_control(unsigned char control[3]);
int process(unsigned nframes, void *)
{
Fs = jack_get_sample_rate(client);
//Handle midi first
void *midi_buf = jack_port_get_buffer(iport, nframes);
jack_midi_event_t ev;
jack_nframes_t event_idx = 0;
while(jack_midi_event_get(&ev, midi_buf, event_idx++) == 0) {
switch(ev.buffer[0]&0xf0) {
case 0x90: //Note On
freq = 440.0f * powf(2.0f, (ev.buffer[1]-69.0f)/12.0f);
current_note = ev.buffer[1];
gate = 1;
break;
case 0x80: //Note Off
if(current_note == ev.buffer[1])
current_note = gate =0;
break;
case 0xB0: //Controller
process_control(ev.buffer);
break;
}
}
//Get all samples
float *smps = (float*) jack_port_get_buffer(port, nframes);
process_output(smps, nframes);
return 0;
}
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