diff options
| -rw-r--r-- | example4.c | 74 |
1 files changed, 73 insertions, 1 deletions
@@ -1,13 +1,19 @@ #include <stdio.h> #include <stdlib.h> +#include <signal.h> #include <alsa/asoundlib.h> #define CLIENT_NAME "ttdaw" -#define MAX_MIDI_PORTS 4 +#define MAX_MIDI_PORTS 1 static snd_seq_t *seq_handle; static snd_seq_addr_t *ports; static int rate = 44100; +static int stop = 0; + +static void sighandler(int sig ATTRIBUTE_UNUSED) { + stop = 1; +} int main(void) { fprintf(stdout, "Example: Reading MIDI input\n"); @@ -33,12 +39,20 @@ int main(void) { exit(1); } + // Connecting ports. char *port_name = "28:0"; + ports = realloc(ports, MAX_MIDI_PORTS * sizeof(snd_seq_addr_t)); if (snd_seq_parse_address(seq_handle, &ports[0], port_name) < 0) { fprintf(stderr, "Invalid port %s.\n", port_name); exit(1); } + // Listing assigned ports. + fprintf(stdout, "Ports:\n"); + for (int j = 0; j < MAX_MIDI_PORTS; j++) { + fprintf(stdout, " client: %d, port: %d\n", ports[j].client, ports[j].port); + } + // Connecting ports. for (int i = 0; i < MAX_MIDI_PORTS; ++i) { int err = snd_seq_connect_from(seq_handle, 0, ports[i].client, ports[i].port); @@ -48,6 +62,64 @@ int main(void) { } } + if (snd_seq_nonblock(seq_handle, 1) < 0) { + fprintf(stderr, "Set nonblock mode failed."); + exit(1); + } + + signal(SIGINT, sighandler); + signal(SIGTERM, sighandler); + + // Reading MIDI device. + struct pollfd *pfds; + int npfds; + + npfds = snd_seq_poll_descriptors_count(seq_handle, POLLIN); + pfds = alloca(sizeof(*pfds) * npfds); + + for (;;) { + snd_seq_poll_descriptors(seq_handle, pfds, npfds, POLLIN); + if (poll(pfds, npfds, -1) < 0) { + break; + } + + for (;;) { + snd_seq_event_t *ev; + + if (snd_seq_event_input(seq_handle, &ev) < 0) { + break; + } + + if (ev) { + switch (ev->type) { + case SND_SEQ_EVENT_NOTEON: + printf("%3d:%-3dNote on %2d, note %d, velocity: %3d\n", + ev->source.client, ev->source.port, + ev->data.note.channel, + ev->data.note.note, + ev->data.note.velocity); + break; + + case SND_SEQ_EVENT_NOTEOFF: + printf("%3d:%-3dNote off\t%2d, note %d\n", + ev->source.client, ev->source.port, + ev->data.note.channel, + ev->data.note.note); + break; + + + } + } + } + + fflush(stdout); + + if (stop) { + break; + } + } + + fprintf(stdout, "Finishing up\n"); snd_seq_close(seq_handle); return 0; } |