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#include <alsa/asoundlib.h>
#include "alsa-seq-send.h"
#include "int.h"
#include "print.h"
/* Make a basic seq queue. */
int alsa_seq_make_default_queue(snd_seq_t *seq)
{
int queue;
queue = snd_seq_alloc_queue(seq);
snd_seq_start_queue(seq, queue, 0);
snd_seq_drain_output(seq);
return queue;
}
/* Apart from setting the event destination, all the code for _send
and _send_to is shared. */
static void alsa_seq_send_common(snd_seq_t *seq, int queue,
int src_port,
snd_midi_event_t *encoder,
u8 *c, int n,
snd_seq_event_t e)
{
if(n <= 0) {
eprintf("%s: empty packet\n", __func__);
return;
}
snd_seq_real_time_t time;
int err;
snd_seq_ev_set_source(&e, src_port);
snd_midi_event_reset_encode(encoder);
err = snd_midi_event_encode(encoder, c, n, &e);
if(err < 0 || e.type == SND_SEQ_EVENT_NONE) {
eprintf("%s: encoding failed: %s\n", __func__, snd_strerror(errno));
return;
}
time.tv_sec = time.tv_nsec = 0;
snd_seq_ev_schedule_real( &e, queue, 1, &time);
err = snd_seq_event_output_direct(seq, &e);
if(err < 0) {
eprintf("%s: output failed: %s\n", __func__, snd_strerror(errno));
return;
}
}
/* Encode the MIDI data at `c' as an ALSA sequencer event and send it
to the registered subscribers. */
void alsa_seq_send(snd_seq_t *seq, int queue,
int src_port,
snd_midi_event_t *encoder,
u8 *c, int n)
{
snd_seq_event_t e;
snd_seq_ev_clear(&e);
snd_seq_ev_set_subs(&e);
alsa_seq_send_common(seq, queue, src_port, encoder, c, n , e);
}
/* Encode the MIDI data at `c' as an ALSA sequencer event and send it
to indicated destination port. */
void alsa_seq_send_to(snd_seq_t *seq, int queue,
int src_port,
int dst_client, int dst_port,
snd_midi_event_t *encoder,
u8 *c, int n)
{
snd_seq_event_t e;
snd_seq_ev_clear(&e);
snd_seq_ev_set_dest(&e, dst_client, dst_port);
alsa_seq_send_common(seq, queue, src_port, encoder, c, n , e);
}
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