3 Ann Hell Ex Machina - Music Software
4 Copyright (C) 2003/2006 Angel Ortega <angel@triptico.com>
6 midi_song.c - MIDI song event stream management
8 This program is free software; you can redistribute it and/or
9 modify it under the terms of the GNU General Public License
10 as published by the Free Software Foundation; either version 2
11 of the License, or (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
22 http://www.triptico.com
34 #include <sys/types.h>
44 struct midi_ev_generic
46 song_ev_type type
; /* event type */
47 int msecs
; /* time in milliseconds */
48 int trk_id
; /* track id */
49 int channel
; /* MIDI channel */
52 struct midi_ev_program
54 song_ev_type type
; /* SONG_EV_MIDI_PROGRAM */
58 int program
; /* MIDI program number */
61 struct midi_ev_note_off
63 song_ev_type type
; /* SONG_EV_NOTE_OFF */
67 int note
; /* MIDI note */
70 struct midi_ev_note_on
72 song_ev_type type
; /* SONG_EV_NOTE_ON */
76 int note
; /* MIDI note */
77 int vel
; /* velocity (volume) */
82 struct midi_ev_generic generic
;
83 struct midi_ev_program midi_program
;
84 struct midi_ev_note_on note_on
;
85 struct midi_ev_note_off note_off
;
89 /* the MIDI song stream */
91 static union midi_ev
* midi_song
= NULL
;
92 static int n_midi_ev
= 0;
94 /* the MIDI tracks: just a track/channel table */
96 #define MIDI_TRACK_NUM 256
97 static int track_channel
[MIDI_TRACK_NUM
];
99 /* MIDI message types */
101 #define MIDI_MSG_NOTE_ON 0x90
102 #define MIDI_MSG_NOTE_OFF 0x80
103 #define MIDI_MSG_CONTROLLER 0xB0
104 #define MIDI_MSG_PROGRAM 0xC0
112 ********************/
114 static void add_midi_ev(union midi_ev
* e
)
115 /* adds a MIDI song event */
117 if(e
->generic
.channel
< 0)
120 GROW(midi_song
, n_midi_ev
, union midi_ev
);
123 memcpy(&midi_song
[n_midi_ev
], e
, sizeof(union midi_ev
));
129 static int midi_ev_cmp_by_time(const void * v1
, const void * v2
)
130 /* MIDI song event compare function for qsort(), by time (for playing) */
132 struct midi_ev_generic
* e1
;
133 struct midi_ev_generic
* e2
;
135 e1
= (struct midi_ev_generic
*)v1
; e2
=(struct midi_ev_generic
*)v2
;
137 if(e1
->msecs
== e2
->msecs
)
138 return(e1
->type
- e2
->type
);
140 return(e1
->msecs
- e2
->msecs
);
144 static void midi_song_convert_events(void)
145 /* converts generic song_ev events to MIDI events */
149 int msecs
, msecs_ac
, f_msecs
;
150 double time_ac
, time_ac_m
;
155 /* resets the MIDI stream */
156 if(midi_song
!= NULL
)
168 msecs
= msecs_ac
= f_msecs
= 0;
169 time_ac
= time_ac_m
= 0;
172 /* by default, all channels are 'mute' until
173 a channel is explicitly set */
174 for(n
= 0;n
< MIDI_TRACK_NUM
;n
++)
175 track_channel
[n
] = -1;
177 /* travels the song events generating MIDI song events */
178 for(n
= 0;n
< n_song_ev
;n
++)
180 /* gets the song event */
183 /* calculates the msecs */
184 msecs
= ((e
->generic
.time
- time_ac
) * mspw
) + msecs_ac
;
186 /* generic event data */
187 me
.generic
.type
= e
->generic
.type
;
188 me
.generic
.msecs
= msecs
;
189 me
.generic
.trk_id
= e
->generic
.trk_id
;
191 /* if it's not a generic message, set MIDI channel */
192 if(e
->generic
.trk_id
>= 0)
193 me
.generic
.channel
= track_channel
[e
->generic
.trk_id
];
195 switch(e
->generic
.type
)
199 /* updates accumulations */
201 time_ac
= e
->generic
.time
;
203 /* calculates milliseconds-per-whole based on new tempo */
204 mspw
= 1000.0 * 60.0;
205 mspw
/= (e
->tempo
.tempo
/ 4.0);
211 /* just store the values */
214 time_ac_m
= e
->meter
.time
;
218 case SONG_EV_MEASURE
:
220 song_test_measure_boundary(e
->measure
.time
- time_ac_m
,
221 num
, den
, e
->measure
.line
);
224 case SONG_EV_MIDI_CHANNEL
:
226 /* stores the channel for this track */
227 track_channel
[e
->midi_channel
.trk_id
] =
228 e
->midi_channel
.channel
;
233 /* convert to note on / off pairs */
235 me
.note_on
.type
= SONG_EV_NOTE_ON
;
236 me
.note_on
.note
= e
->note
.note
;
237 me
.note_on
.vel
= (int)(e
->note
.vol
* 127.0);
241 msecs
+= (int)(e
->note
.len
* mspw
);
243 me
.note_off
.type
= SONG_EV_NOTE_OFF
;
244 me
.note_off
.msecs
= msecs
;
251 /* move the cursor back */
252 msecs_ac
-= (int)(e
->back
.len
* mspw
);
255 case SONG_EV_MIDI_PROGRAM
:
257 /* set MIDI program (instrument) */
258 me
.midi_program
.program
= e
->midi_program
.program
;
263 case SONG_EV_SS_PITCH_STRETCH
:
264 case SONG_EV_SS_PRINT_WAVE_TEMPO
:
267 case SONG_EV_SS_SUSTAIN
:
268 case SONG_EV_SS_VIBRATO
:
269 case SONG_EV_SS_PORTAMENTO
:
270 case SONG_EV_SS_CHANNEL
:
271 case SONG_EV_SS_EFF_DELAY
:
272 case SONG_EV_SS_EFF_ECHO
:
273 case SONG_EV_SS_EFF_COMB
:
274 case SONG_EV_SS_EFF_ALLPASS
:
275 case SONG_EV_SS_EFF_FLANGER
:
276 case SONG_EV_SS_EFF_WOBBLE
:
277 case SONG_EV_SS_EFF_SQWOBBLE
:
278 case SONG_EV_SS_EFF_HFWOBBLE
:
279 case SONG_EV_SS_EFF_FADER
:
280 case SONG_EV_SS_EFF_REVERB
:
281 case SONG_EV_SS_EFF_FOLDBACK
:
282 case SONG_EV_SS_EFF_OFF
:
284 /* softsynth events are ignored */
287 case SONG_EV_SONG_INFO
:
289 /* song info should be used */
294 /* end of track; trigger possible cleaning */
297 case SONG_EV_NOTE_ON
:
298 case SONG_EV_NOTE_OFF
:
301 /* never found in generic song streams */
305 /* store the further time seen */
306 if(f_msecs
< msecs
) f_msecs
= msecs
;
309 /* generates an end of event mark, a time after the last one */
310 me
.generic
.type
= SONG_EV_END
;
311 me
.generic
.msecs
= f_msecs
+ 1000;
316 int midi_song_play(int skip_secs
)
319 int msecs
, msecs_p
, msecs_d
;
322 unsigned char midimsg
[1024];
326 /* convert the song to MIDI events */
327 midi_song_convert_events();
330 qsort(midi_song
, n_midi_ev
, sizeof(union midi_ev
), midi_ev_cmp_by_time
);
336 /* calculate the millisecond to start playing */
337 skip_msecs
= skip_secs
* 1000;
339 /* loop the events */
347 if(msecs
% 1000 == 0)
349 int m
= msecs
/ 1000;
350 printf("[%02d:%02d]\r", m
/ 60, m
% 60);
355 /* process all events for this exact time */
356 while(e
->generic
.msecs
== msecs
)
358 switch(e
->generic
.type
)
360 case SONG_EV_NOTE_ON
:
362 midimsg
[mi
++] = MIDI_MSG_NOTE_ON
|e
->note_on
.channel
;
363 midimsg
[mi
++] = e
->note_on
.note
;
364 midimsg
[mi
++] = e
->note_on
.vel
;
368 case SONG_EV_NOTE_OFF
:
370 midimsg
[mi
++] = MIDI_MSG_NOTE_OFF
|e
->note_off
.channel
;
371 midimsg
[mi
++] = e
->note_off
.note
;
376 case SONG_EV_MIDI_PROGRAM
:
378 midimsg
[mi
++] = MIDI_MSG_PROGRAM
|e
->midi_program
.channel
;
379 midimsg
[mi
++] = e
->midi_program
.program
;
389 /* ignore the rest */
400 /* get time of next event */
402 msecs
= e
->generic
.msecs
;
403 msecs_d
= msecs
- msecs_p
;
405 if(msecs
>= skip_msecs
)
407 /* if there are pending messages, write them */
409 write(midi_fd
, midimsg
, mi
);
411 /* calculate the time to sleep */
412 ts
.tv_sec
= (time_t) msecs_d
/ 1000;
413 ts
.tv_nsec
= (long) ((msecs_d
* 1000000) % 1000000000);
415 nanosleep(&ts
, NULL
);
419 if(verbose
>= 1) printf("\n");
425 int midi_device_open(char * devfile
)
428 devfile
= "/dev/midi";
430 return((midi_fd
= open(devfile
, O_WRONLY
)));
434 void midi_device_close(void)