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