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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* $URL$
* $Id$
*
*/
#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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