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)
121 midi_song
= (union midi_ev
*)realloc(midi_song
,
122 (n_midi_ev
+ 1) * sizeof(union midi_ev
));
125 memcpy(&midi_song
[n_midi_ev
], e
, sizeof(union midi_ev
));
131 static int midi_ev_cmp_by_time(const void * v1
, const void * v2
)
132 /* MIDI song event compare function for qsort(), by time (for playing) */
134 struct midi_ev_generic
* e1
;
135 struct midi_ev_generic
* e2
;
137 e1
= (struct midi_ev_generic
*)v1
; e2
=(struct midi_ev_generic
*)v2
;
139 if(e1
->msecs
== e2
->msecs
)
140 return(e1
->type
- e2
->type
);
142 return(e1
->msecs
- e2
->msecs
);
146 static int midi_song_convert_events(void)
147 /* converts generic song_ev events to MIDI events */
151 int msecs
, msecs_ac
, f_msecs
;
152 double time_ac
, time_ac_m
;
158 /* resets the MIDI stream */
159 if(midi_song
!= NULL
)
171 msecs
= msecs_ac
= f_msecs
= 0;
172 time_ac
= time_ac_m
= 0;
175 /* by default, all channels are 'mute' until
176 a channel is explicitly set */
177 for(n
= 0;n
< MIDI_TRACK_NUM
;n
++)
178 track_channel
[n
] = -1;
180 /* travels the song events generating MIDI song events */
181 for(n
= 0;n
< n_song_ev
;n
++)
183 /* gets the song event */
186 /* calculates the msecs */
187 msecs
= ((e
->generic
.time
- time_ac
) * mspw
) + msecs_ac
;
189 /* generic event data */
190 me
.generic
.type
= e
->generic
.type
;
191 me
.generic
.msecs
= msecs
;
192 me
.generic
.trk_id
= e
->generic
.trk_id
;
194 /* if it's not a generic message, set MIDI channel */
195 if(e
->generic
.trk_id
>= 0)
196 me
.generic
.channel
= track_channel
[e
->generic
.trk_id
];
198 /* account the biggest track number seen */
199 if(b_track
< e
->generic
.trk_id
) b_track
= e
->generic
.trk_id
;
201 switch(e
->generic
.type
)
205 /* updates accumulations */
207 time_ac
= e
->generic
.time
;
209 /* calculates milliseconds-per-whole based on new tempo */
210 mspw
= 1000.0 * 60.0;
211 mspw
/= (e
->tempo
.tempo
/ 4.0);
217 /* just store the values */
220 time_ac_m
= e
->meter
.time
;
224 case SONG_EV_MEASURE
:
226 song_test_measure_boundary(e
->measure
.time
- time_ac_m
,
227 num
, den
, e
->measure
.line
);
230 case SONG_EV_MIDI_CHANNEL
:
232 /* stores the channel for this track */
233 track_channel
[e
->midi_channel
.trk_id
] =
234 e
->midi_channel
.channel
;
239 /* convert to note on / off pairs */
241 me
.note_on
.type
= SONG_EV_NOTE_ON
;
242 me
.note_on
.note
= e
->note
.note
;
243 me
.note_on
.vel
= (int)(e
->note
.vol
* 127.0);
247 msecs
+= (int)(e
->note
.len
* mspw
);
249 me
.note_off
.type
= SONG_EV_NOTE_OFF
;
250 me
.note_off
.msecs
= msecs
;
257 /* move the cursor back */
258 msecs_ac
-= (int)(e
->back
.len
* mspw
);
261 case SONG_EV_MIDI_PROGRAM
:
263 /* set MIDI program (instrument) */
264 me
.midi_program
.program
= e
->midi_program
.program
;
269 case SONG_EV_SS_PITCH_STRETCH
:
270 case SONG_EV_SS_PRINT_WAVE_TEMPO
:
273 case SONG_EV_SS_SUSTAIN
:
274 case SONG_EV_SS_VIBRATO
:
275 case SONG_EV_SS_CHANNEL
:
276 case SONG_EV_SS_EFF_DELAY
:
277 case SONG_EV_SS_EFF_ECHO
:
278 case SONG_EV_SS_EFF_COMB
:
279 case SONG_EV_SS_EFF_ALLPASS
:
280 case SONG_EV_SS_EFF_FLANGER
:
281 case SONG_EV_SS_EFF_WOBBLE
:
282 case SONG_EV_SS_EFF_SQWOBBLE
:
283 case SONG_EV_SS_EFF_FADER
:
284 case SONG_EV_SS_EFF_REVERB
:
285 case SONG_EV_SS_EFF_OFF
:
287 /* softsynth events are ignored */
290 case SONG_EV_SONG_INFO
:
292 /* song info should be used */
295 case SONG_EV_NOTE_ON
:
296 case SONG_EV_NOTE_OFF
:
299 /* never found in generic song streams */
303 /* store the further time seen */
304 if(f_msecs
< msecs
) f_msecs
= msecs
;
307 /* generates an end of event mark, a time after the last one */
308 me
.generic
.type
= SONG_EV_END
;
309 me
.generic
.msecs
= f_msecs
+ 1000;
312 /* return the number of tracks */
317 int midi_song_play(int skip_secs
)
320 int msecs
, msecs_p
, msecs_d
;
324 unsigned char midimsg
[1024];
328 /* convert the song to MIDI events */
329 n_tracks
= midi_song_convert_events();
332 qsort(midi_song
, n_midi_ev
, sizeof(union midi_ev
), midi_ev_cmp_by_time
);
338 /* calculate the millisecond to start playing */
339 skip_msecs
= skip_secs
* 1000;
341 /* loop the events */
349 if(msecs
% 1000 == 0)
351 int m
= msecs
/ 1000;
352 printf("[%02d:%02d]\r", m
/ 60, m
% 60);
357 /* process all events for this exact time */
358 while(e
->generic
.msecs
== msecs
)
360 switch(e
->generic
.type
)
362 case SONG_EV_NOTE_ON
:
364 midimsg
[mi
++] = MIDI_MSG_NOTE_ON
|e
->note_on
.channel
;
365 midimsg
[mi
++] = e
->note_on
.note
;
366 midimsg
[mi
++] = e
->note_on
.vel
;
370 case SONG_EV_NOTE_OFF
:
372 midimsg
[mi
++] = MIDI_MSG_NOTE_OFF
|e
->note_off
.channel
;
373 midimsg
[mi
++] = e
->note_off
.note
;
378 case SONG_EV_MIDI_PROGRAM
:
380 midimsg
[mi
++] = MIDI_MSG_PROGRAM
|e
->midi_program
.channel
;
381 midimsg
[mi
++] = e
->midi_program
.program
;
391 /* ignore the rest */
402 /* get time of next event */
404 msecs
= e
->generic
.msecs
;
405 msecs_d
= msecs
- msecs_p
;
407 if(msecs
>= skip_msecs
)
409 /* if there are pending messages, write them */
411 write(midi_fd
, midimsg
, mi
);
413 /* calculate the time to sleep */
414 ts
.tv_sec
= (time_t) msecs_d
/ 1000;
415 ts
.tv_nsec
= (long) ((msecs_d
* 1000000) % 1000000000);
417 nanosleep(&ts
, NULL
);
421 if(verbose
>= 1) printf("\n");
427 int midi_device_open(char * devfile
)
430 devfile
= "/dev/midi";
432 return((midi_fd
= open(devfile
, O_WRONLY
)));
436 void midi_device_close(void)