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midisine.c
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midisine.c
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/*
Copyright (C) 2004 Ian Esten
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <math.h>
#include <inttypes.h>
#include <jack/jack.h>
#include <jack/midiport.h>
jack_port_t *input_port;
jack_port_t *output_port;
jack_default_audio_sample_t ramp=0.0;
jack_default_audio_sample_t note_on;
unsigned char note = 0;
jack_default_audio_sample_t note_frqs[128];
jack_client_t *client;
static void signal_handler(int sig)
{
jack_client_close(client);
fprintf(stderr, "signal received, exiting ...\n");
exit(0);
}
static void calc_note_frqs(jack_default_audio_sample_t srate)
{
int i;
for(i=0; i<128; i++)
{
note_frqs[i] = (2.0 * 440.0 / 32.0) * pow(2, (((jack_default_audio_sample_t)i - 9.0) / 12.0)) / srate;
}
}
static int process(jack_nframes_t nframes, void *arg)
{
int i;
void* port_buf = jack_port_get_buffer(input_port, nframes);
jack_default_audio_sample_t *out = (jack_default_audio_sample_t *) jack_port_get_buffer (output_port, nframes);
jack_midi_event_t in_event;
jack_nframes_t event_index = 0;
jack_nframes_t event_count = jack_midi_get_event_count(port_buf);
if(event_count > 1)
{
printf(" midisine: have %d events\n", event_count);
for(i=0; i<event_count; i++)
{
jack_midi_event_get(&in_event, port_buf, i);
printf(" event %d time is %d. 1st byte is 0x%x\n", i, in_event.time, *(in_event.buffer));
}
/* printf("1st byte of 1st event addr is %p\n", in_events[0].buffer);*/
}
jack_midi_event_get(&in_event, port_buf, 0);
for(i = 0; i < nframes; i++)
{
if ((in_event.time == i) && (event_index < event_count))
{
if (((*(in_event.buffer) & 0xf0)) == 0x90)
{
/* note on */
note = *(in_event.buffer + 1);
if (*(in_event.buffer + 2) == 0) {
note_on = 0.0;
} else {
note_on = (float)(*(in_event.buffer + 2)) / 127.f;
}
}
else if (((*(in_event.buffer)) & 0xf0) == 0x80)
{
/* note off */
note = *(in_event.buffer + 1);
note_on = 0.0;
}
event_index++;
if(event_index < event_count)
jack_midi_event_get(&in_event, port_buf, event_index);
}
ramp += note_frqs[note];
ramp = (ramp > 1.0) ? ramp - 2.0 : ramp;
out[i] = note_on*sin(2*M_PI*ramp);
}
return 0;
}
static int srate(jack_nframes_t nframes, void *arg)
{
printf("the sample rate is now %" PRIu32 "/sec\n", nframes);
calc_note_frqs((jack_default_audio_sample_t)nframes);
return 0;
}
static void jack_shutdown(void *arg)
{
fprintf(stderr, "JACK shut down, exiting ...\n");
exit(1);
}
int main(int narg, char **args)
{
if ((client = jack_client_open("midisine", JackNullOption, NULL)) == 0)
{
fprintf(stderr, "JACK server not running?\n");
return 1;
}
calc_note_frqs(jack_get_sample_rate (client));
jack_set_process_callback (client, process, 0);
jack_set_sample_rate_callback (client, srate, 0);
jack_on_shutdown (client, jack_shutdown, 0);
input_port = jack_port_register (client, "midi_in", JACK_DEFAULT_MIDI_TYPE, JackPortIsInput, 0);
output_port = jack_port_register (client, "audio_out", JACK_DEFAULT_AUDIO_TYPE, JackPortIsOutput, 0);
if (jack_activate (client))
{
fprintf(stderr, "cannot activate client");
return 1;
}
/* install a signal handler to properly quits jack client */
#ifndef WIN32
signal(SIGQUIT, signal_handler);
signal(SIGHUP, signal_handler);
#endif
signal(SIGTERM, signal_handler);
signal(SIGINT, signal_handler);
/* run until interrupted */
while(1) {
#ifdef WIN32
Sleep(1*1000);
#else
sleep(1);
#endif
}
jack_client_close(client);
exit (0);
}