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1 | ## | |
2 | ## This file is part of the libsigrokdecode project. | |
3 | ## | |
4 | ## Copyright (C) 2013-2016 Uwe Hermann <uwe@hermann-uwe.de> | |
5 | ## Copyright (C) 2016 Chris Dreher <chrisdreher@hotmail.com> | |
6 | ## | |
7 | ## This program is free software; you can redistribute it and/or modify | |
8 | ## it under the terms of the GNU General Public License as published by | |
9 | ## the Free Software Foundation; either version 2 of the License, or | |
10 | ## (at your option) any later version. | |
11 | ## | |
12 | ## This program is distributed in the hope that it will be useful, | |
13 | ## but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | ## GNU General Public License for more details. | |
16 | ## | |
17 | ## You should have received a copy of the GNU General Public License | |
18 | ## along with this program; if not, see <http://www.gnu.org/licenses/>. | |
19 | ## | |
20 | ||
21 | import sigrokdecode as srd | |
22 | from .lists import * | |
23 | ||
24 | RX = 0 | |
25 | TX = 1 | |
26 | ||
27 | class Decoder(srd.Decoder): | |
28 | api_version = 3 | |
29 | id = 'midi' | |
30 | name = 'MIDI' | |
31 | longname = 'Musical Instrument Digital Interface' | |
32 | desc = 'Musical Instrument Digital Interface (MIDI) protocol.' | |
33 | license = 'gplv2+' | |
34 | inputs = ['uart'] | |
35 | outputs = ['midi'] | |
36 | annotations = ( | |
37 | ('text-verbose', 'Human-readable text (verbose)'), | |
38 | ('text-sysreal-verbose', 'Human-readable SysReal text (verbose)'), | |
39 | ('text-error', 'Human-readable Error text'), | |
40 | ) | |
41 | annotation_rows = ( | |
42 | ('normal', 'Normal', (0, 2)), | |
43 | ('sys-real', 'SysReal', (1,)), | |
44 | ) | |
45 | ||
46 | def __init__(self): | |
47 | self.reset() | |
48 | ||
49 | def reset(self): | |
50 | self.state = 'IDLE' | |
51 | self.status_byte = 0 | |
52 | self.explicit_status_byte = False | |
53 | self.cmd = [] | |
54 | self.ss = None | |
55 | self.es = None | |
56 | self.ss_block = None | |
57 | self.es_block = None | |
58 | ||
59 | def start(self): | |
60 | self.out_ann = self.register(srd.OUTPUT_ANN) | |
61 | ||
62 | def putx(self, data): | |
63 | self.put(self.ss_block, self.es_block, self.out_ann, data) | |
64 | ||
65 | def get_note_name(self, channel, note): | |
66 | if channel != 10: | |
67 | return chromatic_notes[note] | |
68 | else: | |
69 | return 'assuming ' + percussion_notes.get(note, 'undefined') | |
70 | ||
71 | def check_for_garbage_flush(self, is_flushed): | |
72 | if is_flushed: | |
73 | if self.explicit_status_byte: | |
74 | self.cmd.insert(0, self.status_byte) | |
75 | self.handle_garbage_msg(None) | |
76 | ||
77 | def soft_clear_status_byte(self): | |
78 | self.explicit_status_byte = False | |
79 | ||
80 | def hard_clear_status_byte(self): | |
81 | self.status_byte = 0 | |
82 | self.explicit_status_byte = False | |
83 | ||
84 | def set_status_byte(self, newbyte): | |
85 | self.status_byte = newbyte | |
86 | self.explicit_status_byte = True | |
87 | ||
88 | def handle_channel_msg_0x80(self, is_flushed): | |
89 | # Note off: 8n kk vv | |
90 | # n = channel, kk = note, vv = velocity | |
91 | c = self.cmd | |
92 | if len(c) < 2: | |
93 | self.check_for_garbage_flush(is_flushed) | |
94 | return | |
95 | self.es_block = self.es | |
96 | msg, chan = self.status_byte & 0xf0, (self.status_byte & 0x0f) + 1 | |
97 | note, velocity = c[0], c[1] | |
98 | note_name = self.get_note_name(chan, note) | |
99 | self.putx([0, ['Channel %d: %s (note = %d \'%s\', velocity = %d)' % \ | |
100 | (chan, status_bytes[msg][0], note, note_name, velocity), | |
101 | 'ch %d: %s %d, velocity = %d' % \ | |
102 | (chan, status_bytes[msg][1], note, velocity), | |
103 | '%d: %s %d, vel %d' % \ | |
104 | (chan, status_bytes[msg][2], note, velocity)]]) | |
105 | self.cmd, self.state = [], 'IDLE' | |
106 | self.soft_clear_status_byte() | |
107 | ||
108 | def handle_channel_msg_0x90(self, is_flushed): | |
109 | # Note on: 9n kk vv | |
110 | # n = channel, kk = note, vv = velocity | |
111 | # If velocity == 0 that actually means 'note off', though. | |
112 | c = self.cmd | |
113 | if len(c) < 2: | |
114 | self.check_for_garbage_flush(is_flushed) | |
115 | return | |
116 | self.es_block = self.es | |
117 | msg, chan = self.status_byte & 0xf0, (self.status_byte & 0x0f) + 1 | |
118 | note, velocity = c[0], c[1] | |
119 | s = status_bytes[0x80] if (velocity == 0) else status_bytes[msg] | |
120 | note_name = self.get_note_name(chan, note) | |
121 | self.putx([0, ['Channel %d: %s (note = %d \'%s\', velocity = %d)' % \ | |
122 | (chan, s[0], note, note_name, velocity), | |
123 | 'ch %d: %s %d, velocity = %d' % \ | |
124 | (chan, s[1], note, velocity), | |
125 | '%d: %s %d, vel %d' % \ | |
126 | (chan, s[2], note, velocity)]]) | |
127 | self.cmd, self.state = [], 'IDLE' | |
128 | self.soft_clear_status_byte() | |
129 | ||
130 | def handle_channel_msg_0xa0(self, is_flushed): | |
131 | # Polyphonic key pressure / aftertouch: An kk vv | |
132 | # n = channel, kk = polyphonic key pressure, vv = pressure value | |
133 | c = self.cmd | |
134 | if len(c) < 2: | |
135 | self.check_for_garbage_flush(is_flushed) | |
136 | return | |
137 | self.es_block = self.es | |
138 | msg, chan = self.status_byte & 0xf0, (self.status_byte & 0x0f) + 1 | |
139 | note, pressure = c[0], c[1] | |
140 | note_name = self.get_note_name(chan, note) | |
141 | self.putx([0, ['Channel %d: %s of %d for note = %d \'%s\'' % \ | |
142 | (chan, status_bytes[msg][0], pressure, note, note_name), | |
143 | 'ch %d: %s %d for note %d' % \ | |
144 | (chan, status_bytes[msg][1], pressure, note), | |
145 | '%d: %s %d, N %d' % \ | |
146 | (chan, status_bytes[msg][2], pressure, note)]]) | |
147 | self.cmd, self.state = [], 'IDLE' | |
148 | self.soft_clear_status_byte() | |
149 | ||
150 | def handle_controller_0x44(self): | |
151 | # Legato footswitch: Bn 44 vv | |
152 | # n = channel, vv = value (<= 0x3f: normal, > 0x3f: legato) | |
153 | c = self.cmd | |
154 | msg, chan = self.status_byte & 0xf0, (self.status_byte & 0x0f) + 1 | |
155 | vv = c[1] | |
156 | t = ('normal', 'no') if vv <= 0x3f else ('legato', 'yes') | |
157 | self.putx([0, ['Channel %d: %s \'%s\' = %s' % \ | |
158 | (chan, status_bytes[msg][0], | |
159 | control_functions[0x44][0], t[0]), | |
160 | 'ch %d: %s \'%s\' = %s' % \ | |
161 | (chan, status_bytes[msg][1], | |
162 | control_functions[0x44][1], t[0]), | |
163 | '%d: %s \'%s\' = %s' % \ | |
164 | (chan, status_bytes[msg][2], | |
165 | control_functions[0x44][2], t[1])]]) | |
166 | ||
167 | def handle_controller_0x54(self): | |
168 | # Portamento control (PTC): Bn 54 kk | |
169 | # n = channel, kk = source note for pitch reference | |
170 | c = self.cmd | |
171 | msg, chan = self.status_byte & 0xf0, (self.status_byte & 0x0f) + 1 | |
172 | kk = c[1] | |
173 | kk_name = self.get_note_name(chan, kk) | |
174 | self.putx([0, ['Channel %d: %s \'%s\' (source note = %d / %s)' % \ | |
175 | (chan, status_bytes[msg][0], | |
176 | control_functions[0x54][0], kk, kk_name), | |
177 | 'ch %d: %s \'%s\' (source note = %d)' % \ | |
178 | (chan, status_bytes[msg][1], | |
179 | control_functions[0x54][1], kk), | |
180 | '%d: %s \'%s\' (src N %d)' % \ | |
181 | (chan, status_bytes[msg][2], | |
182 | control_functions[0x54][2], kk)]]) | |
183 | ||
184 | def handle_controller_generic(self): | |
185 | c = self.cmd | |
186 | msg, chan = self.status_byte & 0xf0, (self.status_byte & 0x0f) + 1 | |
187 | fn, param = c[0], c[1] | |
188 | default_name = 'undefined' | |
189 | ctrl_fn = control_functions.get(fn, default_name) | |
190 | if ctrl_fn == default_name: | |
191 | ctrl_fn = ('undefined 0x%02x' % fn, 'undef 0x%02x' % fn, '0x%02x' % fn) | |
192 | self.putx([0, ['Channel %d: %s \'%s\' (param = 0x%02x)' % \ | |
193 | (chan, status_bytes[msg][0], ctrl_fn[0], param), | |
194 | 'ch %d: %s \'%s\' (param = 0x%02x)' % \ | |
195 | (chan, status_bytes[msg][1], ctrl_fn[1], param), | |
196 | '%d: %s \'%s\' is 0x%02x' % \ | |
197 | (chan, status_bytes[msg][2], ctrl_fn[2], param)]]) | |
198 | ||
199 | def handle_channel_mode(self): | |
200 | # Channel Mode: Bn mm vv | |
201 | # n = channel, mm = mode number (120 - 127), vv = value | |
202 | c = self.cmd | |
203 | msg, chan = self.status_byte & 0xf0, (self.status_byte & 0x0f) + 1 | |
204 | mm, vv = c[0], c[1] | |
205 | mode_fn = control_functions.get(mm, ('undefined', 'undef', 'undef')) | |
206 | # Decode the value based on the mode number. | |
207 | vv_string = ('', '') | |
208 | if mm == 122: # mode = local control? | |
209 | if vv == 0: | |
210 | vv_string = ('off', 'off') | |
211 | elif vv == 127: # mode = poly mode on? | |
212 | vv_string = ('on', 'on') | |
213 | else: | |
214 | vv_string = ('(non-standard param value of 0x%02x)' % vv, | |
215 | '0x%02x' % vv) | |
216 | elif mm == 126: # mode = mono mode on? | |
217 | if vv != 0: | |
218 | vv_string = ('(%d channels)' % vv, '(%d ch)' % vv) | |
219 | else: | |
220 | vv_string = ('(channels \'basic\' through 16)', | |
221 | '(ch \'basic\' thru 16)') | |
222 | elif vv != 0: # All other channel mode messages expect vv == 0. | |
223 | vv_string = ('(non-standard param value of 0x%02x)' % vv, | |
224 | '0x%02x' % vv) | |
225 | self.putx([0, ['Channel %d: %s \'%s\' %s' % \ | |
226 | (chan, status_bytes[msg][0], mode_fn[0], vv_string[0]), | |
227 | 'ch %d: %s \'%s\' %s' % \ | |
228 | (chan, status_bytes[msg][1], mode_fn[1], vv_string[1]), | |
229 | '%d: %s \'%s\' %s' % \ | |
230 | (chan, status_bytes[msg][2], mode_fn[2], vv_string[1])]]) | |
231 | self.cmd, self.state = [], 'IDLE' | |
232 | self.soft_clear_status_byte() | |
233 | ||
234 | def handle_channel_msg_0xb0(self, is_flushed): | |
235 | # Control change (or channel mode messages): Bn cc vv | |
236 | # n = channel, cc = control number (0 - 119), vv = control value | |
237 | c = self.cmd | |
238 | if len(c) < 2: | |
239 | self.check_for_garbage_flush(is_flushed) | |
240 | return | |
241 | self.es_block = self.es | |
242 | if c[0] in range(0x78, 0x7f + 1): | |
243 | self.handle_channel_mode() | |
244 | return | |
245 | handle_ctrl = getattr(self, 'handle_controller_0x%02x' % c[0], | |
246 | self.handle_controller_generic) | |
247 | handle_ctrl() | |
248 | self.cmd, self.state = [], 'IDLE' | |
249 | self.soft_clear_status_byte() | |
250 | ||
251 | def handle_channel_msg_0xc0(self, is_flushed): | |
252 | # Program change: Cn pp | |
253 | # n = channel, pp = program number (0 - 127) | |
254 | c = self.cmd | |
255 | if len(c) < 1: | |
256 | self.check_for_garbage_flush(is_flushed) | |
257 | return | |
258 | self.es_block = self.es | |
259 | msg, chan = self.status_byte & 0xf0, (self.status_byte & 0x0f) + 1 | |
260 | pp = self.cmd[0] + 1 | |
261 | change_type = 'instrument' | |
262 | name = '' | |
263 | if chan != 10: # channel != percussion | |
264 | name = gm_instruments.get(pp, 'undefined') | |
265 | else: | |
266 | change_type = 'drum kit' | |
267 | name = drum_kit.get(pp, 'undefined') | |
268 | self.putx([0, ['Channel %d: %s to %s %d (assuming %s)' % \ | |
269 | (chan, status_bytes[msg][0], change_type, pp, name), | |
270 | 'ch %d: %s to %s %d' % \ | |
271 | (chan, status_bytes[msg][1], change_type, pp), | |
272 | '%d: %s %d' % \ | |
273 | (chan, status_bytes[msg][2], pp)]]) | |
274 | self.cmd, self.state = [], 'IDLE' | |
275 | self.soft_clear_status_byte() | |
276 | ||
277 | def handle_channel_msg_0xd0(self, is_flushed): | |
278 | # Channel pressure / aftertouch: Dn vv | |
279 | # n = channel, vv = pressure value | |
280 | c = self.cmd | |
281 | if len(c) < 1: | |
282 | self.check_for_garbage_flush(is_flushed) | |
283 | return | |
284 | self.es_block = self.es | |
285 | msg, chan = self.status_byte & 0xf0, (self.status_byte & 0x0f) + 1 | |
286 | vv = self.cmd[0] | |
287 | self.putx([0, ['Channel %d: %s %d' % (chan, status_bytes[msg][0], vv), | |
288 | 'ch %d: %s %d' % (chan, status_bytes[msg][1], vv), | |
289 | '%d: %s %d' % (chan, status_bytes[msg][2], vv)]]) | |
290 | self.cmd, self.state = [], 'IDLE' | |
291 | self.soft_clear_status_byte() | |
292 | ||
293 | def handle_channel_msg_0xe0(self, is_flushed): | |
294 | # Pitch bend change: En ll mm | |
295 | # n = channel, ll = pitch bend change LSB, mm = pitch bend change MSB | |
296 | c = self.cmd | |
297 | if len(c) < 2: | |
298 | self.check_for_garbage_flush(is_flushed) | |
299 | return | |
300 | self.es_block = self.es | |
301 | msg, chan = self.status_byte & 0xf0, (self.status_byte & 0x0f) + 1 | |
302 | ll, mm = self.cmd[0], self.cmd[1] | |
303 | decimal = (mm << 7) + ll | |
304 | self.putx([0, ['Channel %d: %s 0x%02x 0x%02x (%d)' % \ | |
305 | (chan, status_bytes[msg][0], ll, mm, decimal), | |
306 | 'ch %d: %s 0x%02x 0x%02x (%d)' % \ | |
307 | (chan, status_bytes[msg][1], ll, mm, decimal), | |
308 | '%d: %s (%d)' % \ | |
309 | (chan, status_bytes[msg][2], decimal)]]) | |
310 | self.cmd, self.state = [], 'IDLE' | |
311 | self.soft_clear_status_byte() | |
312 | ||
313 | def handle_channel_msg_generic(self, is_flushed): | |
314 | # TODO: It should not be possible to hit this code. | |
315 | # It currently can not be unit tested. | |
316 | msg_type = self.status_byte & 0xf0 | |
317 | self.es_block = self.es | |
318 | self.putx([2, ['Unknown channel message type: 0x%02x' % msg_type]]) | |
319 | self.cmd, self.state = [], 'IDLE' | |
320 | self.soft_clear_status_byte() | |
321 | ||
322 | def handle_channel_msg(self, newbyte): | |
323 | if newbyte is not None: | |
324 | if newbyte >= 0x80: | |
325 | self.set_status_byte(newbyte) | |
326 | else: | |
327 | self.cmd.append(newbyte) | |
328 | msg_type = self.status_byte & 0xf0 | |
329 | handle_msg = getattr(self, 'handle_channel_msg_0x%02x' % msg_type, | |
330 | self.handle_channel_msg_generic) | |
331 | handle_msg(newbyte is None) | |
332 | ||
333 | def handle_sysex_msg(self, newbyte): | |
334 | # SysEx message: 1 status byte, 1-3 manuf. bytes, x data bytes, EOX byte | |
335 | # | |
336 | # SysEx messages are variable length, can be terminated by EOX or | |
337 | # by any non-SysReal status byte, and it clears self.status_byte. | |
338 | # | |
339 | # Note: All System message codes don't utilize self.status_byte. | |
340 | self.hard_clear_status_byte() | |
341 | if newbyte != 0xf7 and newbyte is not None: # EOX | |
342 | self.cmd.append(newbyte) | |
343 | return | |
344 | self.es_block = self.es | |
345 | # Note: Unlike other methods, this code pops bytes out of self.cmd | |
346 | # to isolate the data. | |
347 | msg = self.cmd.pop(0) | |
348 | if len(self.cmd) < 1: | |
349 | self.putx([2, ['%s: truncated manufacturer code (<1 bytes)' % \ | |
350 | status_bytes[msg][0], | |
351 | '%s: truncated manufacturer (<1 bytes)' % \ | |
352 | status_bytes[msg][1], | |
353 | '%s: trunc. manu.' % status_bytes[msg][2]]]) | |
354 | self.cmd, self.state = [], 'IDLE' | |
355 | return | |
356 | # Extract the manufacturer name (or SysEx realtime or non-realtime). | |
357 | m1 = self.cmd.pop(0) | |
358 | manu = (m1,) | |
359 | if m1 == 0x00: # If byte == 0, then 2 more manufacturer bytes follow. | |
360 | if len(self.cmd) < 2: | |
361 | self.putx([2, ['%s: truncated manufacturer code (<3 bytes)' % \ | |
362 | status_bytes[msg][0], | |
363 | '%s: truncated manufacturer (<3 bytes)' % \ | |
364 | status_bytes[msg][1], | |
365 | '%s: trunc. manu.' % status_bytes[msg][2]]]) | |
366 | self.cmd, self.state = [], 'IDLE' | |
367 | return | |
368 | manu = (m1, self.cmd.pop(0), self.cmd.pop(0)) | |
369 | default_name = 'undefined' | |
370 | manu_name = sysex_manufacturer_ids.get(manu, default_name) | |
371 | if manu_name == default_name: | |
372 | if len(manu) == 3: | |
373 | manu_name = ('%s (0x%02x 0x%02x 0x%02x)' % \ | |
374 | (default_name, manu[0], manu[1], manu[2]), | |
375 | default_name) | |
376 | else: | |
377 | manu_name = ('%s (0x%02x)' % (default_name, manu[0]), | |
378 | default_name) | |
379 | else: | |
380 | manu_name = (manu_name, manu_name) | |
381 | # Extract the payload, display in 1 of 2 formats | |
382 | # TODO: Write methods to decode SysEx realtime & non-realtime payloads. | |
383 | payload0 = '' | |
384 | payload1 = '' | |
385 | while len(self.cmd) > 0: | |
386 | byte = self.cmd.pop(0) | |
387 | payload0 += '0x%02x ' % (byte) | |
388 | payload1 += '%02x ' % (byte) | |
389 | if payload0 == '': | |
390 | payload0 = '<empty>' | |
391 | payload1 = '<>' | |
392 | payload = (payload0, payload1) | |
393 | self.putx([0, ['%s: for \'%s\' with payload %s' % \ | |
394 | (status_bytes[msg][0], manu_name[0], payload[0]), | |
395 | '%s: \'%s\', payload %s' % \ | |
396 | (status_bytes[msg][1], manu_name[1], payload[1]), | |
397 | '%s: \'%s\', payload %s' % \ | |
398 | (status_bytes[msg][2], manu_name[1], payload[1])]]) | |
399 | self.cmd, self.state = [], 'IDLE' | |
400 | ||
401 | def handle_syscommon_midi_time_code_quarter_frame_msg(self, newbyte): | |
402 | # MIDI time code quarter frame: F1 nd | |
403 | # n = message type | |
404 | # d = values | |
405 | # | |
406 | # Note: All System message codes don't utilize self.status_byte, | |
407 | # and System Exclusive and System Common clear it. | |
408 | c = self.cmd | |
409 | if len(c) < 2: | |
410 | if newbyte is None: | |
411 | self.handle_garbage_msg(None) | |
412 | return | |
413 | msg = c[0] | |
414 | nn, dd = (c[1] & 0x70) >> 4, c[1] & 0x0f | |
415 | group = ('System Common', 'SysCom', 'SC') | |
416 | self.es_block = self.es | |
417 | if nn != 7: # If message type does not contain SMPTE type. | |
418 | self.putx([0, ['%s: %s of %s, value 0x%01x' % \ | |
419 | (group[0], status_bytes[msg][0], | |
420 | quarter_frame_type[nn][0], dd), | |
421 | '%s: %s of %s, value 0x%01x' % \ | |
422 | (group[1], status_bytes[msg][1], | |
423 | quarter_frame_type[nn][1], dd), | |
424 | '%s: %s of %s, value 0x%01x' % \ | |
425 | (group[2], status_bytes[msg][2], | |
426 | quarter_frame_type[nn][1], dd)]]) | |
427 | self.cmd, self.state = [], 'IDLE' | |
428 | return | |
429 | tt = (dd & 0x6) >> 1 | |
430 | self.putx([0, ['%s: %s of %s, value 0x%01x for %s' % \ | |
431 | (group[0], status_bytes[msg][0], \ | |
432 | quarter_frame_type[nn][0], dd, smpte_type[tt]), | |
433 | '%s: %s of %s, value 0x%01x for %s' % \ | |
434 | (group[1], status_bytes[msg][1], \ | |
435 | quarter_frame_type[nn][1], dd, smpte_type[tt]), | |
436 | '%s: %s of %s, value 0x%01x for %s' % \ | |
437 | (group[2], status_bytes[msg][2], \ | |
438 | quarter_frame_type[nn][1], dd, smpte_type[tt])]]) | |
439 | self.cmd, self.state = [], 'IDLE' | |
440 | ||
441 | def handle_syscommon_msg(self, newbyte): | |
442 | # System common messages | |
443 | # | |
444 | # There are 5 simple formats (which are directly handled here) and | |
445 | # 1 complex one called MIDI time code quarter frame. | |
446 | # | |
447 | # Note: While the MIDI lists 0xf7 as a "system common" message, it | |
448 | # is actually only used with SysEx messages so it is processed there. | |
449 | # | |
450 | # Note: All System message codes don't utilize self.status_byte. | |
451 | self.hard_clear_status_byte() | |
452 | if newbyte is not None: | |
453 | self.cmd.append(newbyte) | |
454 | c = self.cmd | |
455 | msg = c[0] | |
456 | group = ('System Common', 'SysCom', 'SC') | |
457 | if msg == 0xf1: | |
458 | # MIDI time code quarter frame | |
459 | self.handle_syscommon_midi_time_code_quarter_frame_msg(newbyte) | |
460 | return | |
461 | elif msg == 0xf2: | |
462 | # Song position pointer: F2 ll mm | |
463 | # ll = LSB position, mm = MSB position | |
464 | if len(c) < 3: | |
465 | if newbyte is None: | |
466 | self.handle_garbage_msg(None) | |
467 | return | |
468 | ll, mm = c[1], c[2] | |
469 | decimal = (mm << 7) + ll | |
470 | self.es_block = self.es | |
471 | self.putx([0, ['%s: %s 0x%02x 0x%02x (%d)' % \ | |
472 | (group[0], status_bytes[msg][0], ll, mm, decimal), | |
473 | '%s: %s 0x%02x 0x%02x (%d)' % \ | |
474 | (group[1], status_bytes[msg][1], ll, mm, decimal), | |
475 | '%s: %s (%d)' % \ | |
476 | (group[2], status_bytes[msg][2], decimal)]]) | |
477 | elif msg == 0xf3: | |
478 | # Song select: F3 ss | |
479 | # ss = song selection number | |
480 | if len(c) < 2: | |
481 | if newbyte is None: | |
482 | self.handle_garbage_msg(None) | |
483 | return | |
484 | ss = c[1] | |
485 | self.es_block = self.es | |
486 | self.putx([0, ['%s: %s number %d' % \ | |
487 | (group[0], status_bytes[msg][0], ss), | |
488 | '%s: %s number %d' % \ | |
489 | (group[1], status_bytes[msg][1], ss), | |
490 | '%s: %s # %d' % \ | |
491 | (group[2], status_bytes[msg][2], ss)]]) | |
492 | elif msg == 0xf4 or msg == 0xf5 or msg == 0xf6: | |
493 | # Undefined 0xf4, Undefined 0xf5, and Tune Request (respectively). | |
494 | # All are only 1 byte long with no data bytes. | |
495 | self.es_block = self.es | |
496 | self.putx([0, ['%s: %s' % (group[0], status_bytes[msg][0]), | |
497 | '%s: %s' % (group[1], status_bytes[msg][1]), | |
498 | '%s: %s' % (group[2], status_bytes[msg][2])]]) | |
499 | self.cmd, self.state = [], 'IDLE' | |
500 | ||
501 | def handle_sysrealtime_msg(self, newbyte): | |
502 | # System realtime message: 0b11111ttt (t = message type) | |
503 | # | |
504 | # Important: These messages are handled differently from all others | |
505 | # because they are allowed to temporarily interrupt other messages. | |
506 | # The interrupted messages resume after the realtime message is done. | |
507 | # Thus, they mostly leave 'self' the way it was found. | |
508 | # | |
509 | # Note: All System message codes don't utilize self.status_byte. | |
510 | old_ss_block, old_es_block = self.ss_block, self.es_block | |
511 | self.ss_block, self.es_block = self.ss, self.es | |
512 | group = ('System Realtime', 'SysReal', 'SR') | |
513 | self.putx([1, ['%s: %s' % (group[0], status_bytes[newbyte][0]), | |
514 | '%s: %s' % (group[1], status_bytes[newbyte][1]), | |
515 | '%s: %s' % (group[2], status_bytes[newbyte][2])]]) | |
516 | self.ss_block, self.es_block = old_ss_block, old_es_block | |
517 | # Deliberately not resetting self.cmd or self.state. | |
518 | ||
519 | def handle_garbage_msg(self, newbyte): | |
520 | # Handle messages that are either not handled or are corrupt. | |
521 | self.es_block = self.es | |
522 | if newbyte is not None: | |
523 | self.cmd.append(newbyte) | |
524 | return | |
525 | payload = '<empty>' | |
526 | max_bytes = 16 # Put a limit on the length on the hex dump. | |
527 | for index in range(len(self.cmd)): | |
528 | if index == max_bytes: | |
529 | payload += ' ...' | |
530 | break | |
531 | if index == 0: | |
532 | payload = '0x%02x' % self.cmd[index] | |
533 | else: | |
534 | payload += ' 0x%02x' % self.cmd[index] | |
535 | self.putx([2, ['UNHANDLED DATA: %s' % payload, | |
536 | 'UNHANDLED', '???', '?']]) | |
537 | self.cmd, self.state = [], 'IDLE' | |
538 | self.hard_clear_status_byte() | |
539 | ||
540 | def handle_state(self, state, newbyte): | |
541 | # 'newbyte' can either be: | |
542 | # 1. Value between 0x00-0xff, deal with the byte normally. | |
543 | # 2. Value of 'None' which means "flush any buffered data". | |
544 | if state == 'HANDLE CHANNEL MSG': | |
545 | self.handle_channel_msg(newbyte) | |
546 | elif state == 'HANDLE SYSEX MSG': | |
547 | self.handle_sysex_msg(newbyte) | |
548 | elif state == 'HANDLE SYSCOMMON MSG': | |
549 | self.handle_syscommon_msg(newbyte) | |
550 | elif state == 'HANDLE SYSREALTIME MSG': | |
551 | self.handle_sysrealtime_msg(newbyte) | |
552 | elif state == 'BUFFER GARBAGE MSG': | |
553 | self.handle_garbage_msg(newbyte) | |
554 | ||
555 | def get_next_state(self, newbyte): | |
556 | # 'newbyte' must be a valid byte between 0x00 and 0xff. | |
557 | # | |
558 | # Try to determine the state based off of the 'newbyte' parameter. | |
559 | if newbyte in range(0x80, 0xef + 1): | |
560 | return 'HANDLE CHANNEL MSG' | |
561 | if newbyte == 0xf0: | |
562 | return 'HANDLE SYSEX MSG' | |
563 | if newbyte in range(0xf1, 0xf7): | |
564 | return'HANDLE SYSCOMMON MSG' | |
565 | if newbyte in range(0xf8, 0xff + 1): | |
566 | return 'HANDLE SYSREALTIME MSG' | |
567 | # Passing 0xf7 is an error; messages don't start with 0xf7. | |
568 | if newbyte == 0xf7: | |
569 | return 'BUFFER GARBAGE MSG' | |
570 | # Next, base the state off of self.status_byte. | |
571 | if self.status_byte < 0x80: | |
572 | return 'BUFFER GARBAGE MSG' | |
573 | return self.get_next_state(self.status_byte) | |
574 | ||
575 | def decode(self, ss, es, data): | |
576 | ptype, rxtx, pdata = data | |
577 | state = 'IDLE' | |
578 | ||
579 | # For now, ignore all UART packets except the actual data packets. | |
580 | if ptype != 'DATA': | |
581 | return | |
582 | ||
583 | # We're only interested in the byte value (not individual bits). | |
584 | pdata = pdata[0] | |
585 | ||
586 | # Short MIDI overview: | |
587 | # - Status bytes are 0x80-0xff, data bytes are 0x00-0x7f. | |
588 | # - Most messages: 1 status byte, 1-2 data bytes. | |
589 | # - Real-time system messages: always 1 byte. | |
590 | # - SysEx messages: 1 status byte, n data bytes, EOX byte. | |
591 | # | |
592 | # Aspects of the MIDI protocol that complicate decoding: | |
593 | # - MIDI System Realtime messages can briefly interrupt other | |
594 | # messages already in progress. | |
595 | # - "Running Status" allows for omitting the status byte in most | |
596 | # scenarios if sequential messages have the same status byte. | |
597 | # - System Exclusive (SysEx) messages can be terminated by ANY | |
598 | # status byte (not limited to EOX byte). | |
599 | ||
600 | # State machine. | |
601 | if pdata >= 0x80 and pdata != 0xf7: | |
602 | state = self.get_next_state(pdata) | |
603 | if state != 'HANDLE SYSREALTIME MSG' and self.state != 'IDLE': | |
604 | # Flush the previous data since a new message is starting. | |
605 | self.handle_state(self.state, None) | |
606 | # Cache ss and es -after- flushing previous data. | |
607 | self.ss, self.es = ss, es | |
608 | # This is a status byte, remember the start sample. | |
609 | if state != 'HANDLE SYSREALTIME MSG': | |
610 | self.ss_block = ss | |
611 | elif self.state == 'IDLE' or self.state == 'BUFFER GARBAGE MSG': | |
612 | # Deal with "running status" or that we're buffering garbage. | |
613 | self.ss, self.es = ss, es | |
614 | if self.state == 'IDLE': | |
615 | self.ss_block = ss | |
616 | state = self.get_next_state(pdata) | |
617 | else: | |
618 | self.ss, self.es = ss, es | |
619 | state = self.state | |
620 | ||
621 | # Yes, this is intentionally _not_ an 'elif' here. | |
622 | if state != 'HANDLE SYSREALTIME MSG': | |
623 | self.state = state | |
624 | if state == 'BUFFER GARBAGE MSG': | |
625 | self.status_byte = 0 | |
626 | self.handle_state(state, pdata) |