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/***************************************************************************
alsa-midi.c Copyright (C) 2002 Christoph Reichenbach
This program may be modified and copied freely according to the terms of
the GNU general public license (GPL), as long as the above copyright
notice and the licensing information contained herein are preserved.
Please refer to www.gnu.org for licensing details.
This work is provided AS IS, without warranty of any kind, expressed or
implied, including but not limited to the warranties of merchantibility,
noninfringement, and fitness for a specific purpose. The author will not
be held liable for any damage caused by this work or derivatives of it.
By using this source code, you agree to the licensing terms as stated
above.
Please contact the maintainer for bug reports or inquiries.
Current Maintainer:
Christoph Reichenbach (CR) <jameson@linuxgames.com>
***************************************************************************/
#include <sfx_engine.h>
#include "../device.h"
#ifdef HAVE_ALSA
#include <alsa/asoundlib.h>
#define SCI_ALSA_MIDI_VERSION "0.1"
static snd_midi_event_t *parser = NULL;
static snd_seq_t *seq = NULL;
static int queue = -1;
static int delta = 0;
static int port_out = -1;
static int port_nr = 128;
static int subport_nr = 0;
static const char *seq_name = "default";
static void
_set_tempo(void) {
int resolution = 60;
int tempo = 1;
snd_seq_queue_tempo_t *queue_tempo;
snd_seq_queue_tempo_malloc(&queue_tempo);
memset(queue_tempo, 0, snd_seq_queue_tempo_sizeof());
snd_seq_queue_tempo_set_ppq(queue_tempo, resolution);
snd_seq_queue_tempo_set_tempo(queue_tempo, 1000000 / tempo);
snd_seq_set_queue_tempo(seq, queue, queue_tempo);
snd_seq_queue_tempo_free(queue_tempo);
#if 0
int tempo = 1000000 / 60;
snd_seq_queue_tempo_t *queue_tempo;
snd_seq_queue_tempo_malloc(&queue_tempo);
snd_seq_queue_tempo_set_tempo(queue_tempo, tempo);
snd_seq_queue_tempo_set_ppq(queue_tempo, 1);
snd_seq_set_queue_tempo(seq, queue, queue_tempo);
snd_seq_queue_tempo_free(queue_tempo);
#endif
}
static int
am_subscribe_to_ports(void) {
if ((port_out = snd_seq_connect_to(seq, port_out, port_nr, subport_nr)) < 0) {
fprintf(stderr, "[SFX] Could not connect to ALSA sequencer port: %s\n", snd_strerror(port_out));
return SFX_ERROR;
}
return SFX_OK;
}
static int
aminit(midi_writer_t *self) {
int err;
snd_midi_event_new(4096, &parser);
snd_midi_event_init(parser);
sciprintf("[SFX] Initialising ALSA MIDI backend, v%s\n", SCI_ALSA_MIDI_VERSION);
if (snd_seq_open(&seq, seq_name, SND_SEQ_OPEN_OUTPUT, SND_SEQ_NONBLOCK)) {
fprintf(stderr, "[SFX] Failed to open ALSA MIDI sequencer '%s' for output\n",
seq_name);
return SFX_ERROR;
}
if ((port_out = snd_seq_create_simple_port(seq, "FreeSCI",
SND_SEQ_PORT_CAP_WRITE |
SND_SEQ_PORT_CAP_SUBS_WRITE |
SND_SEQ_PORT_CAP_READ,
SND_SEQ_PORT_TYPE_MIDI_GENERIC)) < 0) {
fprintf(stderr, "[SFX] Could not create ALSA sequencer port\n");
return SFX_ERROR;
}
if (am_subscribe_to_ports())
return SFX_ERROR;
queue = snd_seq_alloc_queue(seq);
_set_tempo();
snd_seq_start_queue(seq, queue, NULL);
if ((err = snd_seq_drain_output(seq))) {
fflush(NULL);
fprintf(stderr, "[SFX] Error while draining: %s\n",
snd_strerror(err));
return SFX_ERROR;
}
return SFX_OK;
}
static int
amsetopt(midi_writer_t *self, char *name, char *value) {
return SFX_ERROR;
}
static int
amwrite(midi_writer_t *self, unsigned char *buf, int len) {
snd_seq_event_t evt;
#if 0
{
int i;
fprintf(stderr, "[MID] ");
for (i = 0; i < len; i++)
fprintf(stderr, " %02x", buf[i]);
fprintf(stderr, "\n");
}
#endif
snd_seq_ev_clear(&evt);
snd_seq_ev_set_source(&evt, port_out);
snd_seq_ev_set_subs(&evt); /* Broadcast to all subscribers */
snd_midi_event_encode(parser, buf, len, &evt);
snd_seq_ev_schedule_tick(&evt, queue, 0, delta);
snd_seq_event_output_direct(seq, &evt);
#if 0
{
snd_seq_queue_status_t *status;
snd_seq_queue_status_malloc(&status);
snd_seq_get_queue_status(seq, queue, status);
//snd_seq_tick_time_t snd_seq_queue_status_get_tick_time(const snd_seq_queue_status_t *info);
fprintf(stderr, "Queue at %d/%d\n", delta, snd_seq_queue_status_get_tick_time(status));
snd_seq_queue_status_free(status);
}
#endif
return SFX_OK;
}
static void
amdelay(midi_writer_t *self, int ticks) {
delta += ticks;
}
static void
amreset_timer(midi_writer_t *self) {
snd_seq_drain_output(seq);
snd_seq_stop_queue(seq, queue, NULL);
{
snd_seq_event_t evt;
snd_seq_ev_clear(&evt);
snd_seq_ev_set_source(&evt, port_out);
snd_seq_ev_set_subs(&evt); /* Broadcast to all subscribers */
snd_seq_ev_set_queue_pos_tick(&evt, queue, 0);
snd_seq_event_output_direct(seq, &evt);
}
delta = 0;
snd_seq_start_queue(seq, queue, NULL);
}
static void
amclose(midi_writer_t *self) {
snd_midi_event_free(parser);
parser = NULL;
}
midi_writer_t sfx_device_midi_alsa = {
"alsa",
aminit,
amsetopt,
amwrite,
amdelay,
NULL,
amreset_timer,
amclose,
};
#endif
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