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17f5df4f UH |
1 | ## |
2 | ## This file is part of the libsigrokdecode project. | |
3 | ## | |
08475857 UH |
4 | ## Copyright (C) 2013-2016 Uwe Hermann <uwe@hermann-uwe.de> |
5 | ## Copyright (C) 2016 Chris Dreher <chrisdreher@hotmail.com> | |
17f5df4f UH |
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, write to the Free Software | |
19 | ## Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
20 | ## | |
21 | ||
17f5df4f UH |
22 | import sigrokdecode as srd |
23 | from .lists import * | |
24 | ||
25 | RX = 0 | |
26 | TX = 1 | |
27 | ||
28 | class Decoder(srd.Decoder): | |
12851357 | 29 | api_version = 2 |
17f5df4f UH |
30 | id = 'midi' |
31 | name = 'MIDI' | |
32 | longname = 'Musical Instrument Digital Interface' | |
33 | desc = 'Musical Instrument Digital Interface (MIDI) protocol.' | |
34 | license = 'gplv2+' | |
35 | inputs = ['uart'] | |
36 | outputs = ['midi'] | |
da9bcbd9 BV |
37 | annotations = ( |
38 | ('text-verbose', 'Human-readable text (verbose)'), | |
6aa03e3a C |
39 | ('text-sysreal-verbose', 'Human-readable SysReal text (verbose)'), |
40 | ('text-error', 'Human-readable Error text'), | |
41 | ) | |
42 | annotation_rows = ( | |
43 | ('normal', 'Normal', (0, 2)), | |
44 | ('sys-real', 'SysReal', (1,)), | |
da9bcbd9 | 45 | ) |
17f5df4f | 46 | |
92b7b49f | 47 | def __init__(self): |
17f5df4f | 48 | self.state = 'IDLE' |
6aa03e3a C |
49 | self.status_byte = 0 |
50 | self.explicit_status_byte = False | |
51 | self.cmd = [] | |
17f5df4f UH |
52 | self.ss = None |
53 | self.es = None | |
54 | self.ss_block = None | |
55 | self.es_block = None | |
56 | ||
8915b346 | 57 | def start(self): |
be465111 | 58 | self.out_ann = self.register(srd.OUTPUT_ANN) |
17f5df4f | 59 | |
17f5df4f UH |
60 | def putx(self, data): |
61 | self.put(self.ss_block, self.es_block, self.out_ann, data) | |
62 | ||
b0fc934a CD |
63 | def get_note_name(self, channel, note): |
64 | if channel != 10: | |
65 | return chromatic_notes[note] | |
66 | else: | |
67 | return 'assuming ' + percussion_notes.get(note, 'undefined') | |
68 | ||
6aa03e3a | 69 | def check_for_garbage_flush(self, is_flushed): |
740a4a52 UH |
70 | if is_flushed: |
71 | if self.explicit_status_byte: | |
6aa03e3a C |
72 | self.cmd.insert(0, self.status_byte) |
73 | self.handle_garbage_msg(None) | |
74 | ||
75 | def soft_clear_status_byte(self): | |
76 | self.explicit_status_byte = False | |
77 | ||
78 | def hard_clear_status_byte(self): | |
79 | self.status_byte = 0 | |
80 | self.explicit_status_byte = False | |
81 | ||
82 | def set_status_byte(self, newbyte): | |
83 | self.status_byte = newbyte | |
84 | self.explicit_status_byte = True | |
85 | ||
86 | def handle_channel_msg_0x80(self, is_flushed): | |
17f5df4f UH |
87 | # Note off: 8n kk vv |
88 | # n = channel, kk = note, vv = velocity | |
89 | c = self.cmd | |
6aa03e3a C |
90 | if len(c) < 2: |
91 | self.check_for_garbage_flush(is_flushed) | |
17f5df4f UH |
92 | return |
93 | self.es_block = self.es | |
6aa03e3a C |
94 | msg, chan = self.status_byte & 0xf0, (self.status_byte & 0x0f) + 1 |
95 | note, velocity = c[0], c[1] | |
b0fc934a CD |
96 | note_name = self.get_note_name(chan, note) |
97 | self.putx([0, ['Channel %d: %s (note = %d \'%s\', velocity = %d)' % \ | |
9cc1ddf9 C |
98 | (chan, status_bytes[msg][0], note, note_name, velocity), |
99 | 'ch %d: %s %d, velocity = %d' % \ | |
100 | (chan, status_bytes[msg][1], note, velocity), | |
101 | '%d: %s %d, vel %d' % \ | |
102 | (chan, status_bytes[msg][2], note, velocity)]]) | |
17f5df4f | 103 | self.cmd, self.state = [], 'IDLE' |
6aa03e3a | 104 | self.soft_clear_status_byte() |
17f5df4f | 105 | |
6aa03e3a | 106 | def handle_channel_msg_0x90(self, is_flushed): |
17f5df4f UH |
107 | # Note on: 9n kk vv |
108 | # n = channel, kk = note, vv = velocity | |
109 | # If velocity == 0 that actually means 'note off', though. | |
110 | c = self.cmd | |
6aa03e3a C |
111 | if len(c) < 2: |
112 | self.check_for_garbage_flush(is_flushed) | |
17f5df4f | 113 | return |
ee7de90f | 114 | self.es_block = self.es |
6aa03e3a C |
115 | msg, chan = self.status_byte & 0xf0, (self.status_byte & 0x0f) + 1 |
116 | note, velocity = c[0], c[1] | |
9cc1ddf9 | 117 | s = status_bytes[0x80] if (velocity == 0) else status_bytes[msg] |
b0fc934a CD |
118 | note_name = self.get_note_name(chan, note) |
119 | self.putx([0, ['Channel %d: %s (note = %d \'%s\', velocity = %d)' % \ | |
9cc1ddf9 C |
120 | (chan, s[0], note, note_name, velocity), |
121 | 'ch %d: %s %d, velocity = %d' % \ | |
122 | (chan, s[1], note, velocity), | |
123 | '%d: %s %d, vel %d' % \ | |
124 | (chan, s[2], note, velocity)]]) | |
17f5df4f | 125 | self.cmd, self.state = [], 'IDLE' |
6aa03e3a | 126 | self.soft_clear_status_byte() |
17f5df4f | 127 | |
6aa03e3a | 128 | def handle_channel_msg_0xa0(self, is_flushed): |
17f5df4f UH |
129 | # Polyphonic key pressure / aftertouch: An kk vv |
130 | # n = channel, kk = polyphonic key pressure, vv = pressure value | |
b0fc934a | 131 | c = self.cmd |
6aa03e3a C |
132 | if len(c) < 2: |
133 | self.check_for_garbage_flush(is_flushed) | |
b0fc934a CD |
134 | return |
135 | self.es_block = self.es | |
6aa03e3a C |
136 | msg, chan = self.status_byte & 0xf0, (self.status_byte & 0x0f) + 1 |
137 | note, pressure = c[0], c[1] | |
b0fc934a | 138 | note_name = self.get_note_name(chan, note) |
9cc1ddf9 C |
139 | self.putx([0, ['Channel %d: %s of %d for note = %d \'%s\'' % \ |
140 | (chan, status_bytes[msg][0], pressure, note, note_name), | |
141 | 'ch %d: %s %d for note %d' % \ | |
142 | (chan, status_bytes[msg][1], pressure, note), | |
143 | '%d: %s %d, N %d' % \ | |
144 | (chan, status_bytes[msg][2], pressure, note)]]) | |
b0fc934a | 145 | self.cmd, self.state = [], 'IDLE' |
6aa03e3a | 146 | self.soft_clear_status_byte() |
17f5df4f UH |
147 | |
148 | def handle_controller_0x44(self): | |
149 | # Legato footswitch: Bn 44 vv | |
150 | # n = channel, vv = value (<= 0x3f: normal, > 0x3f: legato) | |
9cc1ddf9 | 151 | c = self.cmd |
6aa03e3a C |
152 | msg, chan = self.status_byte & 0xf0, (self.status_byte & 0x0f) + 1 |
153 | vv = c[1] | |
9cc1ddf9 C |
154 | t = ('normal', 'no') if vv <= 0x3f else ('legato', 'yes') |
155 | self.putx([0, ['Channel %d: %s \'%s\' = %s' % \ | |
156 | (chan, status_bytes[msg][0], | |
157 | control_functions[0x44][0], t[0]), | |
158 | 'ch %d: %s \'%s\' = %s' % \ | |
159 | (chan, status_bytes[msg][1], | |
160 | control_functions[0x44][1], t[0]), | |
161 | '%d: %s \'%s\' = %s' % \ | |
162 | (chan, status_bytes[msg][2], | |
163 | control_functions[0x44][2], t[1])]]) | |
17f5df4f UH |
164 | |
165 | def handle_controller_0x54(self): | |
166 | # Portamento control (PTC): Bn 54 kk | |
167 | # n = channel, kk = source note for pitch reference | |
9cc1ddf9 | 168 | c = self.cmd |
6aa03e3a C |
169 | msg, chan = self.status_byte & 0xf0, (self.status_byte & 0x0f) + 1 |
170 | kk = c[1] | |
b0fc934a | 171 | kk_name = self.get_note_name(chan, kk) |
9cc1ddf9 C |
172 | self.putx([0, ['Channel %d: %s \'%s\' (source note = %d / %s)' % \ |
173 | (chan, status_bytes[msg][0], | |
174 | control_functions[0x54][0], kk, kk_name), | |
175 | 'ch %d: %s \'%s\' (source note = %d)' % \ | |
176 | (chan, status_bytes[msg][1], | |
177 | control_functions[0x54][1], kk), | |
178 | '%d: %s \'%s\' (src N %d)' % \ | |
179 | (chan, status_bytes[msg][2], | |
180 | control_functions[0x54][2], kk)]]) | |
17f5df4f UH |
181 | |
182 | def handle_controller_generic(self): | |
183 | c = self.cmd | |
6aa03e3a C |
184 | msg, chan = self.status_byte & 0xf0, (self.status_byte & 0x0f) + 1 |
185 | fn, param = c[0], c[1] | |
b0fc934a CD |
186 | default_name = 'undefined' |
187 | ctrl_fn = control_functions.get(fn, default_name) | |
188 | if ctrl_fn == default_name: | |
9cc1ddf9 C |
189 | ctrl_fn = ('undefined 0x%02x' % fn, 'undef 0x%02x' % fn, '0x%02x' % fn) |
190 | self.putx([0, ['Channel %d: %s \'%s\' (param = 0x%02x)' % \ | |
191 | (chan, status_bytes[msg][0], ctrl_fn[0], param), | |
192 | 'ch %d: %s \'%s\' (param = 0x%02x)' % \ | |
193 | (chan, status_bytes[msg][1], ctrl_fn[1], param), | |
194 | '%d: %s \'%s\' is 0x%02x' % \ | |
195 | (chan, status_bytes[msg][2], ctrl_fn[2], param)]]) | |
17f5df4f | 196 | |
b0fc934a CD |
197 | def handle_channel_mode(self): |
198 | # Channel Mode: Bn mm vv | |
199 | # n = channel, mm = mode number (120 - 127), vv = value | |
200 | c = self.cmd | |
6aa03e3a C |
201 | msg, chan = self.status_byte & 0xf0, (self.status_byte & 0x0f) + 1 |
202 | mm, vv = c[0], c[1] | |
9cc1ddf9 | 203 | mode_fn = control_functions.get(mm, ('undefined', 'undef', 'undef')) |
b0fc934a | 204 | # Decode the value based on the mode number. |
9cc1ddf9 | 205 | vv_string = ('', '') |
b0fc934a CD |
206 | if mm == 122: # mode = local control? |
207 | if vv == 0: | |
9cc1ddf9 | 208 | vv_string = ('off', 'off') |
b0fc934a | 209 | elif vv == 127: # mode = poly mode on? |
9cc1ddf9 | 210 | vv_string = ('on', 'on') |
b0fc934a | 211 | else: |
9cc1ddf9 C |
212 | vv_string = ('(non-standard param value of 0x%02x)' % vv, |
213 | '0x%02x' % vv) | |
b0fc934a CD |
214 | elif mm == 126: # mode = mono mode on? |
215 | if vv != 0: | |
9cc1ddf9 | 216 | vv_string = ('(%d channels)' % vv, '(%d ch)' % vv) |
b0fc934a | 217 | else: |
9cc1ddf9 C |
218 | vv_string = ('(channels \'basic\' through 16)', |
219 | '(ch \'basic\' thru 16)') | |
b0fc934a | 220 | elif vv != 0: # All other channel mode messages expect vv == 0. |
9cc1ddf9 C |
221 | vv_string = ('(non-standard param value of 0x%02x)' % vv, |
222 | '0x%02x' % vv) | |
223 | self.putx([0, ['Channel %d: %s \'%s\' %s' % \ | |
224 | (chan, status_bytes[msg][0], mode_fn[0], vv_string[0]), | |
225 | 'ch %d: %s \'%s\' %s' % \ | |
226 | (chan, status_bytes[msg][1], mode_fn[1], vv_string[1]), | |
227 | '%d: %s \'%s\' %s' % \ | |
228 | (chan, status_bytes[msg][2], mode_fn[2], vv_string[1])]]) | |
b0fc934a | 229 | self.cmd, self.state = [], 'IDLE' |
6aa03e3a | 230 | self.soft_clear_status_byte() |
b0fc934a | 231 | |
6aa03e3a | 232 | def handle_channel_msg_0xb0(self, is_flushed): |
17f5df4f UH |
233 | # Control change (or channel mode messages): Bn cc vv |
234 | # n = channel, cc = control number (0 - 119), vv = control value | |
235 | c = self.cmd | |
6aa03e3a C |
236 | if len(c) < 2: |
237 | self.check_for_garbage_flush(is_flushed) | |
17f5df4f UH |
238 | return |
239 | self.es_block = self.es | |
6aa03e3a | 240 | if c[0] in range(0x78, 0x7f + 1): |
b0fc934a CD |
241 | self.handle_channel_mode() |
242 | return | |
6aa03e3a | 243 | handle_ctrl = getattr(self, 'handle_controller_0x%02x' % c[0], |
17f5df4f UH |
244 | self.handle_controller_generic) |
245 | handle_ctrl() | |
246 | self.cmd, self.state = [], 'IDLE' | |
6aa03e3a | 247 | self.soft_clear_status_byte() |
17f5df4f | 248 | |
6aa03e3a | 249 | def handle_channel_msg_0xc0(self, is_flushed): |
17f5df4f UH |
250 | # Program change: Cn pp |
251 | # n = channel, pp = program number (0 - 127) | |
b0fc934a | 252 | c = self.cmd |
6aa03e3a C |
253 | if len(c) < 1: |
254 | self.check_for_garbage_flush(is_flushed) | |
b0fc934a CD |
255 | return |
256 | self.es_block = self.es | |
6aa03e3a C |
257 | msg, chan = self.status_byte & 0xf0, (self.status_byte & 0x0f) + 1 |
258 | pp = self.cmd[0] + 1 | |
b0fc934a CD |
259 | change_type = 'instrument' |
260 | name = '' | |
261 | if chan != 10: # channel != percussion | |
262 | name = gm_instruments.get(pp, 'undefined') | |
263 | else: | |
264 | change_type = 'drum kit' | |
265 | name = drum_kit.get(pp, 'undefined') | |
266 | self.putx([0, ['Channel %d: %s to %s %d (assuming %s)' % \ | |
9cc1ddf9 C |
267 | (chan, status_bytes[msg][0], change_type, pp, name), |
268 | 'ch %d: %s to %s %d' % \ | |
269 | (chan, status_bytes[msg][1], change_type, pp), | |
270 | '%d: %s %d' % \ | |
271 | (chan, status_bytes[msg][2], pp)]]) | |
b0fc934a | 272 | self.cmd, self.state = [], 'IDLE' |
6aa03e3a | 273 | self.soft_clear_status_byte() |
17f5df4f | 274 | |
6aa03e3a | 275 | def handle_channel_msg_0xd0(self, is_flushed): |
17f5df4f UH |
276 | # Channel pressure / aftertouch: Dn vv |
277 | # n = channel, vv = pressure value | |
b0fc934a | 278 | c = self.cmd |
6aa03e3a C |
279 | if len(c) < 1: |
280 | self.check_for_garbage_flush(is_flushed) | |
b0fc934a CD |
281 | return |
282 | self.es_block = self.es | |
6aa03e3a C |
283 | msg, chan = self.status_byte & 0xf0, (self.status_byte & 0x0f) + 1 |
284 | vv = self.cmd[0] | |
9cc1ddf9 C |
285 | self.putx([0, ['Channel %d: %s %d' % (chan, status_bytes[msg][0], vv), |
286 | 'ch %d: %s %d' % (chan, status_bytes[msg][1], vv), | |
287 | '%d: %s %d' % (chan, status_bytes[msg][2], vv)]]) | |
b0fc934a | 288 | self.cmd, self.state = [], 'IDLE' |
6aa03e3a | 289 | self.soft_clear_status_byte() |
17f5df4f | 290 | |
6aa03e3a | 291 | def handle_channel_msg_0xe0(self, is_flushed): |
17f5df4f UH |
292 | # Pitch bend change: En ll mm |
293 | # n = channel, ll = pitch bend change LSB, mm = pitch bend change MSB | |
b0fc934a | 294 | c = self.cmd |
6aa03e3a C |
295 | if len(c) < 2: |
296 | self.check_for_garbage_flush(is_flushed) | |
b0fc934a CD |
297 | return |
298 | self.es_block = self.es | |
6aa03e3a C |
299 | msg, chan = self.status_byte & 0xf0, (self.status_byte & 0x0f) + 1 |
300 | ll, mm = self.cmd[0], self.cmd[1] | |
b0fc934a CD |
301 | decimal = (mm << 7) + ll |
302 | self.putx([0, ['Channel %d: %s 0x%02x 0x%02x (%d)' % \ | |
9cc1ddf9 C |
303 | (chan, status_bytes[msg][0], ll, mm, decimal), |
304 | 'ch %d: %s 0x%02x 0x%02x (%d)' % \ | |
305 | (chan, status_bytes[msg][1], ll, mm, decimal), | |
306 | '%d: %s (%d)' % \ | |
307 | (chan, status_bytes[msg][2], decimal)]]) | |
b0fc934a | 308 | self.cmd, self.state = [], 'IDLE' |
6aa03e3a | 309 | self.soft_clear_status_byte() |
17f5df4f | 310 | |
6aa03e3a | 311 | def handle_channel_msg_generic(self, is_flushed): |
b0fc934a CD |
312 | # TODO: It should not be possible to hit this code. |
313 | # It currently can not be unit tested. | |
6aa03e3a | 314 | msg_type = self.status_byte & 0xf0 |
b0fc934a | 315 | self.es_block = self.es |
6aa03e3a | 316 | self.putx([2, ['Unknown channel message type: 0x%02x' % msg_type]]) |
b0fc934a | 317 | self.cmd, self.state = [], 'IDLE' |
6aa03e3a | 318 | self.soft_clear_status_byte() |
17f5df4f UH |
319 | |
320 | def handle_channel_msg(self, newbyte): | |
73c8d0fb | 321 | if newbyte is not None: |
6aa03e3a C |
322 | if newbyte >= 0x80: |
323 | self.set_status_byte(newbyte) | |
324 | else: | |
325 | self.cmd.append(newbyte) | |
326 | msg_type = self.status_byte & 0xf0 | |
17f5df4f UH |
327 | handle_msg = getattr(self, 'handle_channel_msg_0x%02x' % msg_type, |
328 | self.handle_channel_msg_generic) | |
73c8d0fb | 329 | handle_msg(newbyte is None) |
17f5df4f UH |
330 | |
331 | def handle_sysex_msg(self, newbyte): | |
b0fc934a | 332 | # SysEx message: 1 status byte, 1-3 manuf. bytes, x data bytes, EOX byte |
6aa03e3a | 333 | # |
f8a6ae16 | 334 | # SysEx messages are variable length, can be terminated by EOX or |
6aa03e3a | 335 | # by any non-SysReal status byte, and it clears self.status_byte. |
f8a6ae16 UH |
336 | # |
337 | # Note: All System message codes don't utilize self.status_byte. | |
6aa03e3a | 338 | self.hard_clear_status_byte() |
73c8d0fb | 339 | if newbyte != 0xf7 and newbyte is not None: # EOX |
6aa03e3a | 340 | self.cmd.append(newbyte) |
17f5df4f UH |
341 | return |
342 | self.es_block = self.es | |
b0fc934a CD |
343 | # Note: Unlike other methods, this code pops bytes out of self.cmd |
344 | # to isolate the data. | |
6aa03e3a | 345 | msg = self.cmd.pop(0) |
b0fc934a | 346 | if len(self.cmd) < 1: |
6aa03e3a | 347 | self.putx([2, ['%s: truncated manufacturer code (<1 bytes)' % \ |
9cc1ddf9 C |
348 | status_bytes[msg][0], |
349 | '%s: truncated manufacturer (<1 bytes)' % \ | |
350 | status_bytes[msg][1], | |
351 | '%s: trunc. manu.' % status_bytes[msg][2]]]) | |
b0fc934a CD |
352 | self.cmd, self.state = [], 'IDLE' |
353 | return | |
354 | # Extract the manufacturer name (or SysEx realtime or non-realtime). | |
355 | m1 = self.cmd.pop(0) | |
356 | manu = (m1,) | |
357 | if m1 == 0x00: # If byte == 0, then 2 more manufacturer bytes follow. | |
358 | if len(self.cmd) < 2: | |
6aa03e3a | 359 | self.putx([2, ['%s: truncated manufacturer code (<3 bytes)' % \ |
9cc1ddf9 C |
360 | status_bytes[msg][0], |
361 | '%s: truncated manufacturer (<3 bytes)' % \ | |
362 | status_bytes[msg][1], | |
363 | '%s: trunc. manu.' % status_bytes[msg][2]]]) | |
b0fc934a CD |
364 | self.cmd, self.state = [], 'IDLE' |
365 | return | |
366 | manu = (m1, self.cmd.pop(0), self.cmd.pop(0)) | |
367 | default_name = 'undefined' | |
368 | manu_name = sysex_manufacturer_ids.get(manu, default_name) | |
369 | if manu_name == default_name: | |
370 | if len(manu) == 3: | |
9cc1ddf9 C |
371 | manu_name = ('%s (0x%02x 0x%02x 0x%02x)' % \ |
372 | (default_name, manu[0], manu[1], manu[2]), | |
373 | default_name) | |
b0fc934a | 374 | else: |
9cc1ddf9 C |
375 | manu_name = ('%s (0x%02x)' % (default_name, manu[0]), |
376 | default_name) | |
377 | else: | |
378 | manu_name = (manu_name, manu_name) | |
379 | # Extract the payload, display in 1 of 2 formats | |
b0fc934a | 380 | # TODO: Write methods to decode SysEx realtime & non-realtime payloads. |
9cc1ddf9 C |
381 | payload0 = '' |
382 | payload1 = '' | |
b0fc934a | 383 | while len(self.cmd) > 0: |
9cc1ddf9 C |
384 | byte = self.cmd.pop(0) |
385 | payload0 += '0x%02x ' % (byte) | |
386 | payload1 += '%02x ' % (byte) | |
387 | if payload0 == '': | |
388 | payload0 = '<empty>' | |
389 | payload1 = '<>' | |
390 | payload = (payload0, payload1) | |
391 | self.putx([0, ['%s: for \'%s\' with payload %s' % \ | |
392 | (status_bytes[msg][0], manu_name[0], payload[0]), | |
393 | '%s: \'%s\', payload %s' % \ | |
394 | (status_bytes[msg][1], manu_name[1], payload[1]), | |
395 | '%s: \'%s\', payload %s' % \ | |
396 | (status_bytes[msg][2], manu_name[1], payload[1])]]) | |
b0fc934a CD |
397 | self.cmd, self.state = [], 'IDLE' |
398 | ||
399 | def handle_syscommon_midi_time_code_quarter_frame_msg(self, newbyte): | |
400 | # MIDI time code quarter frame: F1 nd | |
401 | # n = message type | |
402 | # d = values | |
6aa03e3a | 403 | # |
f8a6ae16 | 404 | # Note: All System message codes don't utilize self.status_byte, |
6aa03e3a | 405 | # and System Exclusive and System Common clear it. |
b0fc934a CD |
406 | c = self.cmd |
407 | if len(c) < 2: | |
73c8d0fb | 408 | if newbyte is None: |
6aa03e3a | 409 | self.handle_garbage_msg(None) |
b0fc934a | 410 | return |
6aa03e3a C |
411 | msg = c[0] |
412 | nn, dd = (c[1] & 0x70) >> 4, c[1] & 0x0f | |
9cc1ddf9 | 413 | group = ('System Common', 'SysCom', 'SC') |
b0fc934a CD |
414 | self.es_block = self.es |
415 | if nn != 7: # If message type does not contain SMPTE type. | |
416 | self.putx([0, ['%s: %s of %s, value 0x%01x' % \ | |
9cc1ddf9 C |
417 | (group[0], status_bytes[msg][0], |
418 | quarter_frame_type[nn][0], dd), | |
419 | '%s: %s of %s, value 0x%01x' % \ | |
420 | (group[1], status_bytes[msg][1], | |
421 | quarter_frame_type[nn][1], dd), | |
422 | '%s: %s of %s, value 0x%01x' % \ | |
423 | (group[2], status_bytes[msg][2], | |
424 | quarter_frame_type[nn][1], dd)]]) | |
b0fc934a CD |
425 | self.cmd, self.state = [], 'IDLE' |
426 | return | |
427 | tt = (dd & 0x6) >> 1 | |
428 | self.putx([0, ['%s: %s of %s, value 0x%01x for %s' % \ | |
9cc1ddf9 C |
429 | (group[0], status_bytes[msg][0], \ |
430 | quarter_frame_type[nn][0], dd, smpte_type[tt]), | |
431 | '%s: %s of %s, value 0x%01x for %s' % \ | |
432 | (group[1], status_bytes[msg][1], \ | |
433 | quarter_frame_type[nn][1], dd, smpte_type[tt]), | |
434 | '%s: %s of %s, value 0x%01x for %s' % \ | |
435 | (group[2], status_bytes[msg][2], \ | |
436 | quarter_frame_type[nn][1], dd, smpte_type[tt])]]) | |
17f5df4f UH |
437 | self.cmd, self.state = [], 'IDLE' |
438 | ||
439 | def handle_syscommon_msg(self, newbyte): | |
b0fc934a CD |
440 | # System common messages |
441 | # | |
442 | # There are 5 simple formats (which are directly handled here) and | |
443 | # 1 complex one called MIDI time code quarter frame. | |
444 | # | |
445 | # Note: While the MIDI lists 0xf7 as a "system common" message, it | |
446 | # is actually only used with SysEx messages so it is processed there. | |
f8a6ae16 UH |
447 | # |
448 | # Note: All System message codes don't utilize self.status_byte. | |
6aa03e3a | 449 | self.hard_clear_status_byte() |
73c8d0fb | 450 | if newbyte is not None: |
6aa03e3a | 451 | self.cmd.append(newbyte) |
b0fc934a | 452 | c = self.cmd |
6aa03e3a | 453 | msg = c[0] |
9cc1ddf9 | 454 | group = ('System Common', 'SysCom', 'SC') |
b0fc934a CD |
455 | if msg == 0xf1: |
456 | # MIDI time code quarter frame | |
457 | self.handle_syscommon_midi_time_code_quarter_frame_msg(newbyte) | |
458 | return | |
459 | elif msg == 0xf2: | |
460 | # Song position pointer: F2 ll mm | |
461 | # ll = LSB position, mm = MSB position | |
462 | if len(c) < 3: | |
73c8d0fb | 463 | if newbyte is None: |
6aa03e3a | 464 | self.handle_garbage_msg(None) |
b0fc934a | 465 | return |
6aa03e3a | 466 | ll, mm = c[1], c[2] |
b0fc934a CD |
467 | decimal = (mm << 7) + ll |
468 | self.es_block = self.es | |
469 | self.putx([0, ['%s: %s 0x%02x 0x%02x (%d)' % \ | |
9cc1ddf9 C |
470 | (group[0], status_bytes[msg][0], ll, mm, decimal), |
471 | '%s: %s 0x%02x 0x%02x (%d)' % \ | |
472 | (group[1], status_bytes[msg][1], ll, mm, decimal), | |
473 | '%s: %s (%d)' % \ | |
474 | (group[2], status_bytes[msg][2], decimal)]]) | |
b0fc934a CD |
475 | elif msg == 0xf3: |
476 | # Song select: F3 ss | |
477 | # ss = song selection number | |
478 | if len(c) < 2: | |
73c8d0fb | 479 | if newbyte is None: |
6aa03e3a | 480 | self.handle_garbage_msg(None) |
b0fc934a | 481 | return |
6aa03e3a | 482 | ss = c[1] |
b0fc934a | 483 | self.es_block = self.es |
9cc1ddf9 C |
484 | self.putx([0, ['%s: %s number %d' % \ |
485 | (group[0], status_bytes[msg][0], ss), | |
486 | '%s: %s number %d' % \ | |
487 | (group[1], status_bytes[msg][1], ss), | |
488 | '%s: %s # %d' % \ | |
489 | (group[2], status_bytes[msg][2], ss)]]) | |
b0fc934a CD |
490 | elif msg == 0xf4 or msg == 0xf5 or msg == 0xf6: |
491 | # Undefined 0xf4, Undefined 0xf5, and Tune Request (respectively). | |
492 | # All are only 1 byte long with no data bytes. | |
493 | self.es_block = self.es | |
9cc1ddf9 C |
494 | self.putx([0, ['%s: %s' % (group[0], status_bytes[msg][0]), |
495 | '%s: %s' % (group[1], status_bytes[msg][1]), | |
496 | '%s: %s' % (group[2], status_bytes[msg][2])]]) | |
b0fc934a | 497 | self.cmd, self.state = [], 'IDLE' |
17f5df4f UH |
498 | |
499 | def handle_sysrealtime_msg(self, newbyte): | |
500 | # System realtime message: 0b11111ttt (t = message type) | |
6aa03e3a | 501 | # |
f8a6ae16 | 502 | # Important: These messages are handled differently from all others |
6aa03e3a C |
503 | # because they are allowed to temporarily interrupt other messages. |
504 | # The interrupted messages resume after the realtime message is done. | |
505 | # Thus, they mostly leave 'self' the way it was found. | |
f8a6ae16 UH |
506 | # |
507 | # Note: All System message codes don't utilize self.status_byte. | |
508 | old_ss_block, old_es_block = self.ss_block, self.es_block | |
509 | self.ss_block, self.es_block = self.ss, self.es | |
9cc1ddf9 | 510 | group = ('System Realtime', 'SysReal', 'SR') |
6aa03e3a | 511 | self.putx([1, ['%s: %s' % (group[0], status_bytes[newbyte][0]), |
9cc1ddf9 C |
512 | '%s: %s' % (group[1], status_bytes[newbyte][1]), |
513 | '%s: %s' % (group[2], status_bytes[newbyte][2])]]) | |
f8a6ae16 UH |
514 | self.ss_block, self.es_block = old_ss_block, old_es_block |
515 | # Deliberately not resetting self.cmd or self.state. | |
6aa03e3a C |
516 | |
517 | def handle_garbage_msg(self, newbyte): | |
f8a6ae16 | 518 | # Handle messages that are either not handled or are corrupt. |
6aa03e3a | 519 | self.es_block = self.es |
73c8d0fb | 520 | if newbyte is not None: |
6aa03e3a C |
521 | self.cmd.append(newbyte) |
522 | return | |
523 | payload = '<empty>' | |
f8a6ae16 UH |
524 | max_bytes = 16 # Put a limit on the length on the hex dump. |
525 | for index in range(len(self.cmd)): | |
6aa03e3a | 526 | if index == max_bytes: |
f8a6ae16 | 527 | payload += ' ...' |
6aa03e3a C |
528 | break |
529 | if index == 0: | |
530 | payload = '0x%02x' % self.cmd[index] | |
531 | else: | |
f8a6ae16 | 532 | payload += ' 0x%02x' % self.cmd[index] |
6aa03e3a | 533 | self.putx([2, ['UNHANDLED DATA: %s' % payload, |
f8a6ae16 | 534 | 'UNHANDLED', '???', '?']]) |
17f5df4f | 535 | self.cmd, self.state = [], 'IDLE' |
6aa03e3a C |
536 | self.hard_clear_status_byte() |
537 | ||
538 | def handle_state(self, state, newbyte): | |
539 | # 'newbyte' can either be: | |
f8a6ae16 UH |
540 | # 1. Value between 0x00-0xff, deal with the byte normally. |
541 | # 2. Value of 'None' which means "flush any buffered data". | |
6aa03e3a C |
542 | if state == 'HANDLE CHANNEL MSG': |
543 | self.handle_channel_msg(newbyte) | |
544 | elif state == 'HANDLE SYSEX MSG': | |
545 | self.handle_sysex_msg(newbyte) | |
546 | elif state == 'HANDLE SYSCOMMON MSG': | |
547 | self.handle_syscommon_msg(newbyte) | |
548 | elif state == 'HANDLE SYSREALTIME MSG': | |
549 | self.handle_sysrealtime_msg(newbyte) | |
550 | elif state == 'BUFFER GARBAGE MSG': | |
551 | self.handle_garbage_msg(newbyte) | |
552 | ||
553 | def get_next_state(self, newbyte): | |
f8a6ae16 | 554 | # 'newbyte' must be a valid byte between 0x00 and 0xff. |
6aa03e3a | 555 | # |
f8a6ae16 | 556 | # Try to determine the state based off of the 'newbyte' parameter. |
6aa03e3a C |
557 | if newbyte in range(0x80, 0xef + 1): |
558 | return 'HANDLE CHANNEL MSG' | |
559 | if newbyte == 0xf0: | |
560 | return 'HANDLE SYSEX MSG' | |
561 | if newbyte in range(0xf1, 0xf7): | |
562 | return'HANDLE SYSCOMMON MSG' | |
563 | if newbyte in range(0xf8, 0xff + 1): | |
564 | return 'HANDLE SYSREALTIME MSG' | |
f8a6ae16 | 565 | # Passing 0xf7 is an error; messages don't start with 0xf7. |
6aa03e3a C |
566 | if newbyte == 0xf7: |
567 | return 'BUFFER GARBAGE MSG' | |
f8a6ae16 | 568 | # Next, base the state off of self.status_byte. |
6aa03e3a C |
569 | if self.status_byte < 0x80: |
570 | return 'BUFFER GARBAGE MSG' | |
571 | return self.get_next_state(self.status_byte) | |
17f5df4f UH |
572 | |
573 | def decode(self, ss, es, data): | |
574 | ptype, rxtx, pdata = data | |
6aa03e3a | 575 | state = 'IDLE' |
17f5df4f UH |
576 | |
577 | # For now, ignore all UART packets except the actual data packets. | |
578 | if ptype != 'DATA': | |
579 | return | |
580 | ||
7cf698c5 UH |
581 | # We're only interested in the byte value (not individual bits). |
582 | pdata = pdata[0] | |
583 | ||
17f5df4f UH |
584 | # Short MIDI overview: |
585 | # - Status bytes are 0x80-0xff, data bytes are 0x00-0x7f. | |
586 | # - Most messages: 1 status byte, 1-2 data bytes. | |
587 | # - Real-time system messages: always 1 byte. | |
588 | # - SysEx messages: 1 status byte, n data bytes, EOX byte. | |
f8a6ae16 | 589 | # |
6aa03e3a C |
590 | # Aspects of the MIDI protocol that complicate decoding: |
591 | # - MIDI System Realtime messages can briefly interrupt other | |
f8a6ae16 | 592 | # messages already in progress. |
6aa03e3a C |
593 | # - "Running Status" allows for omitting the status byte in most |
594 | # scenarios if sequential messages have the same status byte. | |
595 | # - System Exclusive (SysEx) messages can be terminated by ANY | |
596 | # status byte (not limited to EOX byte). | |
597 | ||
17f5df4f | 598 | # State machine. |
6aa03e3a C |
599 | if pdata >= 0x80 and pdata != 0xf7: |
600 | state = self.get_next_state(pdata) | |
601 | if state != 'HANDLE SYSREALTIME MSG' and self.state != 'IDLE': | |
f8a6ae16 | 602 | # Flush the previous data since a new message is starting. |
6aa03e3a | 603 | self.handle_state(self.state, None) |
f8a6ae16 | 604 | # Cache ss and es -after- flushing previous data. |
6aa03e3a | 605 | self.ss, self.es = ss, es |
17f5df4f | 606 | # This is a status byte, remember the start sample. |
f8a6ae16 UH |
607 | if state != 'HANDLE SYSREALTIME MSG': |
608 | self.ss_block = ss | |
6aa03e3a | 609 | elif self.state == 'IDLE' or self.state == 'BUFFER GARBAGE MSG': |
f8a6ae16 | 610 | # Deal with "running status" or that we're buffering garbage. |
6aa03e3a | 611 | self.ss, self.es = ss, es |
f8a6ae16 UH |
612 | if self.state == 'IDLE': |
613 | self.ss_block = ss | |
6aa03e3a C |
614 | state = self.get_next_state(pdata) |
615 | else: | |
616 | self.ss, self.es = ss, es | |
617 | state = self.state | |
17f5df4f UH |
618 | |
619 | # Yes, this is intentionally _not_ an 'elif' here. | |
6aa03e3a C |
620 | if state != 'HANDLE SYSREALTIME MSG': |
621 | self.state = state | |
622 | if state == 'BUFFER GARBAGE MSG': | |
623 | self.status_byte = 0 | |
624 | self.handle_state(state, pdata) |