summaryrefslogtreecommitdiffstats
path: root/sound/core/ump_convert.c
blob: de04799fdb69aaf3b08de639739e52f09ebb55a3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Helpers for UMP <-> MIDI 1.0 byte stream conversion
 */

#include <linux/module.h>
#include <linux/export.h>
#include <sound/core.h>
#include <sound/asound.h>
#include <sound/ump.h>
#include <sound/ump_convert.h>

/*
 * Upgrade / downgrade value bits
 */
static u8 downscale_32_to_7bit(u32 src)
{
	return src >> 25;
}

static u16 downscale_32_to_14bit(u32 src)
{
	return src >> 18;
}

static u8 downscale_16_to_7bit(u16 src)
{
	return src >> 9;
}

static u16 upscale_7_to_16bit(u8 src)
{
	u16 val, repeat;

	val = (u16)src << 9;
	if (src <= 0x40)
		return val;
	repeat = src & 0x3f;
	return val | (repeat << 3) | (repeat >> 3);
}

static u32 upscale_7_to_32bit(u8 src)
{
	u32 val, repeat;

	val = src << 25;
	if (src <= 0x40)
		return val;
	repeat = src & 0x3f;
	return val | (repeat << 19) | (repeat << 13) |
		(repeat << 7) | (repeat << 1) | (repeat >> 5);
}

static u32 upscale_14_to_32bit(u16 src)
{
	u32 val, repeat;

	val = src << 18;
	if (src <= 0x2000)
		return val;
	repeat = src & 0x1fff;
	return val | (repeat << 5) | (repeat >> 8);
}

/*
 * UMP -> MIDI 1 byte stream conversion
 */
/* convert a UMP System message to MIDI 1.0 byte stream */
static int cvt_ump_system_to_legacy(u32 data, unsigned char *buf)
{
	buf[0] = ump_message_status_channel(data);
	switch (ump_message_status_code(data)) {
	case UMP_SYSTEM_STATUS_MIDI_TIME_CODE:
	case UMP_SYSTEM_STATUS_SONG_SELECT:
		buf[1] = (data >> 8) & 0x7f;
		return 2;
	case UMP_SYSTEM_STATUS_SONG_POSITION:
		buf[1] = (data >> 8) & 0x7f;
		buf[2] = data & 0x7f;
		return 3;
	default:
		return 1;
	}
}

/* convert a UMP MIDI 1.0 Channel Voice message to MIDI 1.0 byte stream */
static int cvt_ump_midi1_to_legacy(u32 data, unsigned char *buf)
{
	buf[0] = ump_message_status_channel(data);
	buf[1] = (data >> 8) & 0xff;
	switch (ump_message_status_code(data)) {
	case UMP_MSG_STATUS_PROGRAM:
	case UMP_MSG_STATUS_CHANNEL_PRESSURE:
		return 2;
	default:
		buf[2] = data & 0xff;
		return 3;
	}
}

/* convert a UMP MIDI 2.0 Channel Voice message to MIDI 1.0 byte stream */
static int cvt_ump_midi2_to_legacy(const union snd_ump_midi2_msg *midi2,
				   unsigned char *buf)
{
	unsigned char status = midi2->note.status;
	unsigned char channel = midi2->note.channel;
	u16 v;

	buf[0] = (status << 4) | channel;
	switch (status) {
	case UMP_MSG_STATUS_NOTE_OFF:
	case UMP_MSG_STATUS_NOTE_ON:
		buf[1] = midi2->note.note;
		buf[2] = downscale_16_to_7bit(midi2->note.velocity);
		if (status == UMP_MSG_STATUS_NOTE_ON && !buf[2])
			buf[2] = 1;
		return 3;
	case UMP_MSG_STATUS_POLY_PRESSURE:
		buf[1] = midi2->paf.note;
		buf[2] = downscale_32_to_7bit(midi2->paf.data);
		return 3;
	case UMP_MSG_STATUS_CC:
		buf[1] = midi2->cc.index;
		buf[2] = downscale_32_to_7bit(midi2->cc.data);
		return 3;
	case UMP_MSG_STATUS_CHANNEL_PRESSURE:
		buf[1] = downscale_32_to_7bit(midi2->caf.data);
		return 2;
	case UMP_MSG_STATUS_PROGRAM:
		if (midi2->pg.bank_valid) {
			buf[0] = channel | (UMP_MSG_STATUS_CC << 4);
			buf[1] = UMP_CC_BANK_SELECT;
			buf[2] = midi2->pg.bank_msb;
			buf[3] = channel | (UMP_MSG_STATUS_CC << 4);
			buf[4] = UMP_CC_BANK_SELECT_LSB;
			buf[5] = midi2->pg.bank_lsb;
			buf[6] = channel | (UMP_MSG_STATUS_PROGRAM << 4);
			buf[7] = midi2->pg.program;
			return 8;
		}
		buf[1] = midi2->pg.program;
		return 2;
	case UMP_MSG_STATUS_PITCH_BEND:
		v = downscale_32_to_14bit(midi2->pb.data);
		buf[1] = v & 0x7f;
		buf[2] = v >> 7;
		return 3;
	case UMP_MSG_STATUS_RPN:
	case UMP_MSG_STATUS_NRPN:
		buf[0] = channel | (UMP_MSG_STATUS_CC << 4);
		buf[1] = status == UMP_MSG_STATUS_RPN ? UMP_CC_RPN_MSB : UMP_CC_NRPN_MSB;
		buf[2] = midi2->rpn.bank;
		buf[3] = buf[0];
		buf[4] = status == UMP_MSG_STATUS_RPN ? UMP_CC_RPN_LSB : UMP_CC_NRPN_LSB;
		buf[5] = midi2->rpn.index;
		buf[6] = buf[0];
		buf[7] = UMP_CC_DATA;
		v = downscale_32_to_14bit(midi2->rpn.data);
		buf[8] = v >> 7;
		buf[9] = buf[0];
		buf[10] = UMP_CC_DATA_LSB;
		buf[11] = v & 0x7f;
		return 12;
	default:
		return 0;
	}
}

/* convert a UMP 7-bit SysEx message to MIDI 1.0 byte stream */
static int cvt_ump_sysex7_to_legacy(const u32 *data, unsigned char *buf)
{
	unsigned char status;
	unsigned char bytes;
	int size, offset;

	status = ump_sysex_message_status(*data);
	if (status > UMP_SYSEX_STATUS_END)
		return 0; // unsupported, skip
	bytes = ump_sysex_message_length(*data);
	if (bytes > 6)
		return 0; // skip

	size = 0;
	if (status == UMP_SYSEX_STATUS_SINGLE ||
	    status == UMP_SYSEX_STATUS_START) {
		buf[0] = UMP_MIDI1_MSG_SYSEX_START;
		size = 1;
	}

	offset = 8;
	for (; bytes; bytes--, size++) {
		buf[size] = (*data >> offset) & 0x7f;
		if (!offset) {
			offset = 24;
			data++;
		} else {
			offset -= 8;
		}
	}

	if (status == UMP_SYSEX_STATUS_SINGLE ||
	    status == UMP_SYSEX_STATUS_END)
		buf[size++] = UMP_MIDI1_MSG_SYSEX_END;

	return size;
}

/**
 * snd_ump_convert_from_ump - convert from UMP to legacy MIDI
 * @data: UMP packet
 * @buf: buffer to store legacy MIDI data
 * @group_ret: pointer to store the target group
 *
 * Convert from a UMP packet @data to MIDI 1.0 bytes at @buf.
 * The target group is stored at @group_ret.
 *
 * The function returns the number of bytes of MIDI 1.0 stream.
 */
int snd_ump_convert_from_ump(const u32 *data,
			     unsigned char *buf,
			     unsigned char *group_ret)
{
	*group_ret = ump_message_group(*data);

	switch (ump_message_type(*data)) {
	case UMP_MSG_TYPE_SYSTEM:
		return cvt_ump_system_to_legacy(*data, buf);
	case UMP_MSG_TYPE_MIDI1_CHANNEL_VOICE:
		return cvt_ump_midi1_to_legacy(*data, buf);
	case UMP_MSG_TYPE_MIDI2_CHANNEL_VOICE:
		return cvt_ump_midi2_to_legacy((const union snd_ump_midi2_msg *)data,
					       buf);
	case UMP_MSG_TYPE_DATA:
		return cvt_ump_sysex7_to_legacy(data, buf);
	}

	return 0;
}
EXPORT_SYMBOL_GPL(snd_ump_convert_from_ump);

/*
 * MIDI 1 byte stream -> UMP conversion
 */
/* convert MIDI 1.0 SysEx to a UMP packet */
static int cvt_legacy_sysex_to_ump(struct ump_cvt_to_ump *cvt,
				   unsigned char group, u32 *data, bool finish)
{
	unsigned char status;
	bool start = cvt->in_sysex == 1;
	int i, offset;

	if (start && finish)
		status = UMP_SYSEX_STATUS_SINGLE;
	else if (start)
		status = UMP_SYSEX_STATUS_START;
	else if (finish)
		status = UMP_SYSEX_STATUS_END;
	else
		status = UMP_SYSEX_STATUS_CONTINUE;
	*data = ump_compose(UMP_MSG_TYPE_DATA, group, status, cvt->len);
	offset = 8;
	for (i = 0; i < cvt->len; i++) {
		*data |= cvt->buf[i] << offset;
		if (!offset) {
			offset = 24;
			data++;
		} else
			offset -= 8;
	}
	cvt->len = 0;
	if (finish)
		cvt->in_sysex = 0;
	else
		cvt->in_sysex++;
	return 8;
}

/* convert to a UMP System message */
static int cvt_legacy_system_to_ump(struct ump_cvt_to_ump *cvt,
				    unsigned char group, u32 *data)
{
	data[0] = ump_compose(UMP_MSG_TYPE_SYSTEM, group, 0, cvt->buf[0]);
	if (cvt->cmd_bytes > 1)
		data[0] |= cvt->buf[1] << 8;
	if (cvt->cmd_bytes > 2)
		data[0] |= cvt->buf[2];
	return 4;
}

static void fill_rpn(struct ump_cvt_to_ump_bank *cc,
		     union snd_ump_midi2_msg *midi2)
{
	if (cc->rpn_set) {
		midi2->rpn.status = UMP_MSG_STATUS_RPN;
		midi2->rpn.bank = cc->cc_rpn_msb;
		midi2->rpn.index = cc->cc_rpn_lsb;
		cc->rpn_set = 0;
		cc->cc_rpn_msb = cc->cc_rpn_lsb = 0;
	} else {
		midi2->rpn.status = UMP_MSG_STATUS_NRPN;
		midi2->rpn.bank = cc->cc_nrpn_msb;
		midi2->rpn.index = cc->cc_nrpn_lsb;
		cc->nrpn_set = 0;
		cc->cc_nrpn_msb = cc->cc_nrpn_lsb = 0;
	}
	midi2->rpn.data = upscale_14_to_32bit((cc->cc_data_msb << 7) |
					      cc->cc_data_lsb);
	cc->cc_data_msb = cc->cc_data_lsb = 0;
}

/* convert to a MIDI 1.0 Channel Voice message */
static int cvt_legacy_cmd_to_ump(struct ump_cvt_to_ump *cvt,
				 unsigned char group,
				 unsigned int protocol,
				 u32 *data, unsigned char bytes)
{
	const unsigned char *buf = cvt->buf;
	struct ump_cvt_to_ump_bank *cc;
	union snd_ump_midi2_msg *midi2 = (union snd_ump_midi2_msg *)data;
	unsigned char status, channel;

	BUILD_BUG_ON(sizeof(union snd_ump_midi1_msg) != 4);
	BUILD_BUG_ON(sizeof(union snd_ump_midi2_msg) != 8);

	/* for MIDI 1.0 UMP, it's easy, just pack it into UMP */
	if (protocol & SNDRV_UMP_EP_INFO_PROTO_MIDI1) {
		data[0] = ump_compose(UMP_MSG_TYPE_MIDI1_CHANNEL_VOICE,
				      group, 0, buf[0]);
		data[0] |= buf[1] << 8;
		if (bytes > 2)
			data[0] |= buf[2];
		return 4;
	}

	status = *buf >> 4;
	channel = *buf & 0x0f;
	cc = &cvt->bank[channel];

	/* special handling: treat note-on with 0 velocity as note-off */
	if (status == UMP_MSG_STATUS_NOTE_ON && !buf[2])
		status = UMP_MSG_STATUS_NOTE_OFF;

	/* initialize the packet */
	data[0] = ump_compose(UMP_MSG_TYPE_MIDI2_CHANNEL_VOICE,
			      group, status, channel);
	data[1] = 0;

	switch (status) {
	case UMP_MSG_STATUS_NOTE_ON:
	case UMP_MSG_STATUS_NOTE_OFF:
		midi2->note.note = buf[1];
		midi2->note.velocity = upscale_7_to_16bit(buf[2]);
		break;
	case UMP_MSG_STATUS_POLY_PRESSURE:
		midi2->paf.note = buf[1];
		midi2->paf.data = upscale_7_to_32bit(buf[2]);
		break;
	case UMP_MSG_STATUS_CC:
		switch (buf[1]) {
		case UMP_CC_RPN_MSB:
			cc->rpn_set = 1;
			cc->cc_rpn_msb = buf[2];
			return 0; // skip
		case UMP_CC_RPN_LSB:
			cc->rpn_set = 1;
			cc->cc_rpn_lsb = buf[2];
			return 0; // skip
		case UMP_CC_NRPN_MSB:
			cc->nrpn_set = 1;
			cc->cc_nrpn_msb = buf[2];
			return 0; // skip
		case UMP_CC_NRPN_LSB:
			cc->nrpn_set = 1;
			cc->cc_nrpn_lsb = buf[2];
			return 0; // skip
		case UMP_CC_DATA:
			cc->cc_data_msb = buf[2];
			return 0; // skip
		case UMP_CC_BANK_SELECT:
			cc->bank_set = 1;
			cc->cc_bank_msb = buf[2];
			return 0; // skip
		case UMP_CC_BANK_SELECT_LSB:
			cc->bank_set = 1;
			cc->cc_bank_lsb = buf[2];
			return 0; // skip
		case UMP_CC_DATA_LSB:
			cc->cc_data_lsb = buf[2];
			if (cc->rpn_set || cc->nrpn_set)
				fill_rpn(cc, midi2);
			else
				return 0; // skip
			break;
		default:
			midi2->cc.index = buf[1];
			midi2->cc.data = upscale_7_to_32bit(buf[2]);
			break;
		}
		break;
	case UMP_MSG_STATUS_PROGRAM:
		midi2->pg.program = buf[1];
		if (cc->bank_set) {
			midi2->pg.bank_valid = 1;
			midi2->pg.bank_msb = cc->cc_bank_msb;
			midi2->pg.bank_lsb = cc->cc_bank_lsb;
			cc->bank_set = 0;
			cc->cc_bank_msb = cc->cc_bank_lsb = 0;
		}
		break;
	case UMP_MSG_STATUS_CHANNEL_PRESSURE:
		midi2->caf.data = upscale_7_to_32bit(buf[1]);
		break;
	case UMP_MSG_STATUS_PITCH_BEND:
		midi2->pb.data = upscale_14_to_32bit(buf[1] | (buf[2] << 7));
		break;
	default:
		return 0;
	}

	return 8;
}

static int do_convert_to_ump(struct ump_cvt_to_ump *cvt, unsigned char group,
			     unsigned int protocol, unsigned char c, u32 *data)
{
	/* bytes for 0x80-0xf0 */
	static unsigned char cmd_bytes[8] = {
		3, 3, 3, 3, 2, 2, 3, 0
	};
	/* bytes for 0xf0-0xff */
	static unsigned char system_bytes[16] = {
		0, 2, 3, 2, 0, 0, 1, 0, 1, 1, 1, 1, 0, 0, 1, 1
	};
	unsigned char bytes;

	if (c == UMP_MIDI1_MSG_SYSEX_START) {
		cvt->in_sysex = 1;
		cvt->len = 0;
		return 0;
	}
	if (c == UMP_MIDI1_MSG_SYSEX_END) {
		if (!cvt->in_sysex)
			return 0; /* skip */
		return cvt_legacy_sysex_to_ump(cvt, group, data, true);
	}

	if ((c & 0xf0) == UMP_MIDI1_MSG_REALTIME) {
		bytes = system_bytes[c & 0x0f];
		if (!bytes)
			return 0; /* skip */
		if (bytes == 1) {
			data[0] = ump_compose(UMP_MSG_TYPE_SYSTEM, group, 0, c);
			return 4;
		}
		cvt->buf[0] = c;
		cvt->len = 1;
		cvt->cmd_bytes = bytes;
		cvt->in_sysex = 0; /* abort SysEx */
		return 0;
	}

	if (c & 0x80) {
		bytes = cmd_bytes[(c >> 4) & 7];
		cvt->buf[0] = c;
		cvt->len = 1;
		cvt->cmd_bytes = bytes;
		cvt->in_sysex = 0; /* abort SysEx */
		return 0;
	}

	if (cvt->in_sysex) {
		cvt->buf[cvt->len++] = c;
		if (cvt->len == 6)
			return cvt_legacy_sysex_to_ump(cvt, group, data, false);
		return 0;
	}

	if (!cvt->len)
		return 0;

	cvt->buf[cvt->len++] = c;
	if (cvt->len < cvt->cmd_bytes)
		return 0;
	cvt->len = 1;
	if ((cvt->buf[0] & 0xf0) == UMP_MIDI1_MSG_REALTIME)
		return cvt_legacy_system_to_ump(cvt, group, data);
	return cvt_legacy_cmd_to_ump(cvt, group, protocol, data, cvt->cmd_bytes);
}

/**
 * snd_ump_convert_to_ump - convert legacy MIDI byte to UMP packet
 * @cvt: converter context
 * @group: target UMP group
 * @protocol: target UMP protocol
 * @c: MIDI 1.0 byte data
 *
 * Feed a MIDI 1.0 byte @c and convert to a UMP packet if completed.
 * The result is stored in the buffer in @cvt.
 */
void snd_ump_convert_to_ump(struct ump_cvt_to_ump *cvt, unsigned char group,
			    unsigned int protocol, unsigned char c)
{
	cvt->ump_bytes = do_convert_to_ump(cvt, group, protocol, c, cvt->ump);
}
EXPORT_SYMBOL_GPL(snd_ump_convert_to_ump);