87 lines
2.2 KiB
C
87 lines
2.2 KiB
C
---
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author: "Flávio Schiavoni"
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description: Obla dá!
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---
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <alsa/asoundlib.h>
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extern struct timespec timespec_diff(struct timespec start, struct timespec end);
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extern double timespec_millis(struct timespec time);
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snd_seq_t *open_seq();
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void midi_action(snd_seq_t *seq_handle);
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int keep_walking;
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static void sigint_handler(int i){
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keep_walking = 0;
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}
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int main(int argc, char *argv[]) {
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int note_on_time = 1000000; // 1 segundo
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int note_off_time = 1000000; // 1 segundo (em microsegundos)
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signal(SIGINT, &sigint_handler);
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signal(SIGTERM, &sigint_handler);
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keep_walking = 1;
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// Crio o dispositivo MIDI
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snd_seq_t *seq_handle;
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int portid;
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if (snd_seq_open(&seq_handle, "hw", SND_SEQ_OPEN_DUPLEX, 0) < 0) {
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fprintf(stderr, "Error opening ALSA sequencer.\n");
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exit(1);
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}
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snd_seq_set_client_name(seq_handle, "Teclado");
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if ((portid = snd_seq_create_simple_port(seq_handle, "keyb",
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SND_SEQ_PORT_CAP_READ|SND_SEQ_PORT_CAP_SUBS_READ,
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SND_SEQ_PORT_TYPE_APPLICATION)) < 0) {
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fprintf(stderr, "Error creating sequencer port.\n");
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exit(1);
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}
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snd_seq_event_t ev;
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snd_seq_ev_clear(&ev);
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snd_seq_ev_set_source(&ev, 0);
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snd_seq_ev_set_subs(&ev);
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snd_seq_ev_set_direct(&ev);
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while (keep_walking) {
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int key = getchar();
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printf("Pressionou o %d\n", key);
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switch(key){
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case 'a':
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snd_seq_ev_set_noteon(&ev, 0, 60, 127);
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snd_seq_event_output(seq_handle, &ev);
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snd_seq_drain_output(seq_handle);
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usleep(note_on_time / 3);
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snd_seq_ev_set_noteoff(&ev, 0, 60, 0);
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snd_seq_event_output(seq_handle, &ev);
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snd_seq_drain_output(seq_handle);
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break;
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case 's':
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snd_seq_ev_set_noteon(&ev, 0, 62, 127);
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snd_seq_event_output(seq_handle, &ev);
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snd_seq_drain_output(seq_handle);
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usleep(note_on_time / 3);
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snd_seq_ev_set_noteoff(&ev, 0, 62, 0);
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snd_seq_event_output(seq_handle, &ev);
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snd_seq_drain_output(seq_handle);
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}
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}
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snd_seq_close(seq_handle);
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return 0;
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}
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