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[minwii.git] / src / mxmMidi / MidiOutStream.py
1 # -*- coding: ISO-8859-1 -*-
2
3 class MidiOutStream:
4
5
6 """
7
8 MidiOutstream is Basically an eventhandler. It is the most central
9 class in the Midi library. You use it both for writing events to
10 an output stream, and as an event handler for an input stream.
11
12 This makes it extremely easy to take input from one stream and
13 send it to another. Ie. if you want to read a Midi file, do some
14 processing, and send it to a midiport.
15
16 All time values are in absolute values from the opening of a
17 stream. To calculate time values, please use the MidiTime and
18 MidiDeltaTime classes.
19
20 """
21
22 def __init__(self):
23
24 # the time is rather global, so it needs to be stored
25 # here. Otherwise there would be no really simple way to
26 # calculate it. The alternative would be to have each event
27 # handler do it. That sucks even worse!
28 self._absolute_time = 0
29 self._relative_time = 0
30 self._current_track = 0
31 self._running_status = None
32
33 # time handling event handlers. They should be overwritten with care
34
35 def update_time(self, new_time=0, relative=1):
36 """
37 Updates the time, if relative is true, new_time is relative,
38 else it's absolute.
39 """
40 if relative:
41 self._relative_time = new_time
42 self._absolute_time += new_time
43 else:
44 self._relative_time = new_time - self._absolute_time
45 self._absolute_time = new_time
46
47 def reset_time(self):
48 """
49 reset time to 0
50 """
51 self._relative_time = 0
52 self._absolute_time = 0
53
54 def rel_time(self):
55 "Returns the relative time"
56 return self._relative_time
57
58 def abs_time(self):
59 "Returns the absolute time"
60 return self._absolute_time
61
62 # running status methods
63
64 def reset_run_stat(self):
65 "Invalidates the running status"
66 self._running_status = None
67
68 def set_run_stat(self, new_status):
69 "Set the new running status"
70 self._running_status = new_status
71
72 def get_run_stat(self):
73 "Set the new running status"
74 return self._running_status
75
76 # track handling event handlers
77
78 def set_current_track(self, new_track):
79 "Sets the current track number"
80 self._current_track = new_track
81
82 def get_current_track(self):
83 "Returns the current track number"
84 return self._current_track
85
86
87 #####################
88 ## Midi events
89
90
91 def channel_message(self, message_type, channel, data):
92 """The default event handler for channel messages"""
93 pass
94
95
96 def note_on(self, channel=0, note=0x40, velocity=0x40):
97
98 """
99 channel: 0-15
100 note, velocity: 0-127
101 """
102 pass
103
104
105 def note_off(self, channel=0, note=0x40, velocity=0x40):
106
107 """
108 channel: 0-15
109 note, velocity: 0-127
110 """
111 pass
112
113
114 def aftertouch(self, channel=0, note=0x40, velocity=0x40):
115
116 """
117 channel: 0-15
118 note, velocity: 0-127
119 """
120 pass
121
122
123 def continuous_controller(self, channel, controller, value):
124
125 """
126 channel: 0-15
127 controller, value: 0-127
128 """
129 pass
130
131
132 def patch_change(self, channel, patch):
133
134 """
135 channel: 0-15
136 patch: 0-127
137 """
138 pass
139
140
141 def channel_pressure(self, channel, pressure):
142
143 """
144 channel: 0-15
145 pressure: 0-127
146 """
147 pass
148
149
150 def pitch_bend(self, channel, value):
151
152 """
153 channel: 0-15
154 value: 0-16383
155
156 """
157 pass
158
159
160
161
162 #####################
163 ## System Exclusive
164
165 def system_exclusive(self, data):
166
167 """
168 data: list of values in range(128)
169 """
170 pass
171
172
173 #####################
174 ## Common events
175
176 def song_position_pointer(self, value):
177
178 """
179 value: 0-16383
180 """
181 pass
182
183
184 def song_select(self, songNumber):
185
186 """
187 songNumber: 0-127
188 """
189 pass
190
191
192 def tuning_request(self):
193
194 """
195 No values passed
196 """
197 pass
198
199
200 def midi_time_code(self, msg_type, values):
201 """
202 msg_type: 0-7
203 values: 0-15
204 """
205 pass
206
207
208 #########################
209 # header does not really belong here. But anyhoo!!!
210
211 def header(self, format=0, nTracks=1, division=96):
212
213 """
214 format: type of midi file in [1,2]
215 nTracks: number of tracks
216 division: timing division
217 """
218 pass
219
220
221 def eof(self):
222
223 """
224 End of file. No more events to be processed.
225 """
226 pass
227
228
229 #####################
230 ## meta events
231
232
233 def meta_event(self, meta_type, data):
234
235 """
236 Handles any undefined meta events
237 """
238 pass
239
240
241 def start_of_track(self, n_track=0):
242
243 """
244 n_track: number of track
245 """
246 pass
247
248
249 def end_of_track(self):
250
251 """
252 n_track: number of track
253 """
254 pass
255
256
257 def sequence_number(self, value):
258
259 """
260 value: 0-16383
261 """
262 pass
263
264
265 def text(self, text):
266
267 """
268 Text event
269 text: string
270 """
271 pass
272
273
274 def copyright(self, text):
275
276 """
277 Copyright notice
278 text: string
279 """
280 pass
281
282
283 def sequence_name(self, text):
284
285 """
286 Sequence/track name
287 text: string
288 """
289 pass
290
291
292 def instrument_name(self, text):
293
294 """
295 text: string
296 """
297 pass
298
299
300 def lyric(self, text):
301
302 """
303 text: string
304 """
305 pass
306
307
308 def marker(self, text):
309
310 """
311 text: string
312 """
313 pass
314
315
316 def cuepoint(self, text):
317
318 """
319 text: string
320 """
321 pass
322
323
324 def midi_ch_prefix(self, channel):
325
326 """
327 channel: midi channel for subsequent data (deprecated in the spec)
328 """
329 pass
330
331
332 def midi_port(self, value):
333
334 """
335 value: Midi port (deprecated in the spec)
336 """
337 pass
338
339
340 def tempo(self, value):
341
342 """
343 value: 0-2097151
344 tempo in us/quarternote
345 (to calculate value from bpm: int(60,000,000.00 / BPM))
346 """
347 pass
348
349
350 def smtp_offset(self, hour, minute, second, frame, framePart):
351
352 """
353 hour,
354 minute,
355 second: 3 bytes specifying the hour (0-23), minutes (0-59) and
356 seconds (0-59), respectively. The hour should be
357 encoded with the SMPTE format, just as it is in MIDI
358 Time Code.
359 frame: A byte specifying the number of frames per second (one
360 of : 24, 25, 29, 30).
361 framePart: A byte specifying the number of fractional frames,
362 in 100ths of a frame (even in SMPTE-based tracks
363 using a different frame subdivision, defined in the
364 MThd chunk).
365 """
366 pass
367
368
369
370 def time_signature(self, nn, dd, cc, bb):
371
372 """
373 nn: Numerator of the signature as notated on sheet music
374 dd: Denominator of the signature as notated on sheet music
375 The denominator is a negative power of 2: 2 = quarter
376 note, 3 = eighth, etc.
377 cc: The number of MIDI clocks in a metronome click
378 bb: The number of notated 32nd notes in a MIDI quarter note
379 (24 MIDI clocks)
380 """
381 pass
382
383
384
385 def key_signature(self, sf, mi):
386
387 """
388 sf: is a byte specifying the number of flats (-ve) or sharps
389 (+ve) that identifies the key signature (-7 = 7 flats, -1
390 = 1 flat, 0 = key of C, 1 = 1 sharp, etc).
391 mi: is a byte specifying a major (0) or minor (1) key.
392 """
393 pass
394
395
396
397 def sequencer_specific(self, data):
398
399 """
400 data: The data as byte values
401 """
402 pass
403
404
405
406
407 #####################
408 ## realtime events
409
410 def timing_clock(self):
411
412 """
413 No values passed
414 """
415 pass
416
417
418
419 def song_start(self):
420
421 """
422 No values passed
423 """
424 pass
425
426
427
428 def song_stop(self):
429
430 """
431 No values passed
432 """
433 pass
434
435
436
437 def song_continue(self):
438
439 """
440 No values passed
441 """
442 pass
443
444
445
446 def active_sensing(self):
447
448 """
449 No values passed
450 """
451 pass
452
453
454
455 def system_reset(self):
456
457 """
458 No values passed
459 """
460 pass
461
462
463
464 if __name__ == '__main__':
465
466 midiOut = MidiOutStream()
467 midiOut.update_time(0,0)
468 midiOut.note_on(0, 63, 127)
469 midiOut.note_off(0, 63, 127)
470
471