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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 <jack/jack.h>
#include <jack/midiport.h>
#include <stdio.h>
#include <signal.h>
#include <stdlib.h>
#include <unistd.h>
jack_client_t *client;
jack_port_t *output_port;
unsigned char* note_frqs;
jack_nframes_t* note_starts;
jack_nframes_t* note_lengths;
jack_nframes_t num_notes;
jack_nframes_t loop_nsamp;
jack_nframes_t loop_index;
static void signal_handler(int sig)
{
jack_client_close(client);
fprintf(stderr, "signal received, exiting ...\n");
exit(0);
}
static void usage()
{
fprintf(stderr, "usage: jack_midiseq name nsamp [startindex note nsamp] ...... [startindex note nsamp]\n");
fprintf(stderr, "eg: jack_midiseq Sequencer 24000 0 60 8000 12000 63 8000\n");
fprintf(stderr, "will play a 1/2 sec loop (if srate is 48khz) with a c4 note at the start of the loop\n");
fprintf(stderr, "that lasts for 12000 samples, then a d4# that starts at 1/4 sec that lasts for 800 samples\n");
}
static int process(jack_nframes_t nframes, void *arg)
{
int i,j;
void* port_buf = jack_port_get_buffer(output_port, nframes);
unsigned char* buffer;
jack_midi_clear_buffer(port_buf);
/*memset(buffer, 0, nframes*sizeof(jack_default_audio_sample_t));*/
for (i = 0; i < nframes; i++) {
for (j = 0; j < num_notes; j++) {
if (note_starts[j] == loop_index) {
if ((buffer = jack_midi_event_reserve(port_buf, i, 3))) {
/* printf("wrote a note on, port buffer = 0x%x, event buffer = 0x%x\n", port_buf, buffer); */
buffer[2] = 64; /* velocity */
buffer[1] = note_frqs[j];
buffer[0] = 0x90; /* note on */
}
} else if (note_starts[j] + note_lengths[j] == loop_index) {
if ((buffer = jack_midi_event_reserve(port_buf, i, 3))) {
/* printf("wrote a note off, port buffer = 0x%x, event buffer = 0x%x\n", port_buf, buffer); */
buffer[2] = 64; /* velocity */
buffer[1] = note_frqs[j];
buffer[0] = 0x80; /* note off */
}
}
}
loop_index = loop_index+1 >= loop_nsamp ? 0 : loop_index+1;
}
return 0;
}
int main(int narg, char **args)
{
int i;
if ((narg<6) || ((narg-3)%3 != 0)) {
usage();
exit(1);
}
if ((client = jack_client_open (args[1], JackNullOption, NULL)) == 0) {
fprintf (stderr, "JACK server not running?\n");
return 1;
}
jack_set_process_callback (client, process, 0);
output_port = jack_port_register (client, "out", JACK_DEFAULT_MIDI_TYPE, JackPortIsOutput, 0);
loop_index = 0;
num_notes = (narg - 3)/3;
note_frqs = malloc(num_notes*sizeof(unsigned char));
note_starts = malloc(num_notes*sizeof(jack_nframes_t));
note_lengths = malloc(num_notes*sizeof(jack_nframes_t));
loop_nsamp = atoi(args[2]);
for (i = 0; i < num_notes; i++) {
note_starts[i] = atoi(args[3 + 3*i]);
note_frqs[i] = atoi(args[4 + 3*i]);
note_lengths[i] = atoi(args[5 + 3*i]);
}
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);
}
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