aboutsummaryrefslogtreecommitdiffhomepage
path: root/backends/winmidi.c
blob: bda5401de6e7ac5059ba968429714dd5e4d31aca (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
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
#include <string.h>

#include "libmmbackend.h"
#include <mmsystem.h>

#include "winmidi.h"

#define BACKEND_NAME "winmidi"

static struct {
	uint8_t list_devices;
	uint8_t detect;
	int socket_pair[2];

	CRITICAL_SECTION push_events;
	volatile size_t events_alloc;
	volatile size_t events_active;
	volatile winmidi_event* event;
} backend_config = {
	.list_devices = 0,
	.socket_pair = {-1, -1}
};

//TODO receive feedback socket until EAGAIN

MM_PLUGIN_API int init(){
	backend winmidi = {
		.name = BACKEND_NAME,
		.conf = winmidi_configure,
		.create = winmidi_instance,
		.conf_instance = winmidi_configure_instance,
		.channel = winmidi_channel,
		.handle = winmidi_set,
		.process = winmidi_handle,
		.start = winmidi_start,
		.shutdown = winmidi_shutdown
	};

	if(sizeof(winmidi_channel_ident) != sizeof(uint64_t)){
		fprintf(stderr, "winmidi channel identification union out of bounds\n");
		return 1;
	}

	//register backend
	if(mm_backend_register(winmidi)){
		fprintf(stderr, "Failed to register winmidi backend\n");
		return 1;
	}

	//initialize critical section
	InitializeCriticalSectionAndSpinCount(&backend_config.push_events, 4000);
	return 0;
}

static int winmidi_configure(char* option, char* value){
	if(!strcmp(option, "list")){
		backend_config.list_devices = 0;
		if(!strcmp(value, "on")){
			backend_config.list_devices = 1;
		}
		return 0;
	}
	else if(!strcmp(option, "detect")){
		backend_config.detect = 0;
		if(!strcmp(value, "on")){
			backend_config.detect = 1;
		}
		return 0;
	}

	fprintf(stderr, "Unknown winmidi backend option %s\n", option);
	return 1;
}

static int winmidi_configure_instance(instance* inst, char* option, char* value){
	winmidi_instance_data* data = (winmidi_instance_data*) inst->impl;
	if(!strcmp(option, "read")){
		if(data->read){
			fprintf(stderr, "winmidi instance %s already connected to an input device\n", inst->name);
			return 1;
		}
		data->read = strdup(value);
		return 0;
	}
	if(!strcmp(option, "write")){
		if(data->write){
			fprintf(stderr, "winmidi instance %s already connected to an output device\n", inst->name);
			return 1;
		}
		data->write = strdup(value);
		return 0;
	}

	fprintf(stderr, "Unknown winmidi instance option %s\n", option);
	return 1;
}

static instance* winmidi_instance(){
	instance* i = mm_instance();
	if(!i){
		return NULL;
	}

	i->impl = calloc(1, sizeof(winmidi_instance_data));
	if(!i->impl){
		fprintf(stderr, "Failed to allocate memory\n");
		return NULL;
	}

	return i;
}

static channel* winmidi_channel(instance* inst, char* spec){
	char* next_token = NULL;
	winmidi_channel_ident ident = {
		.label = 0
	};

	if(!strncmp(spec, "ch", 2)){
		next_token = spec + 2;
		if(!strncmp(spec, "channel", 7)){
			next_token = spec + 7;
		}
	}
	
	if(!next_token){
		fprintf(stderr, "Invalid winmidi channel specification %s\n", spec);
		return NULL;
	}

	ident.fields.channel = strtoul(next_token, &next_token, 10);
	if(ident.fields.channel > 15){
		fprintf(stderr, "MIDI channel out of range in winmidi channel spec %s\n", spec);
		return NULL;
	}

	if(*next_token != '.'){
		fprintf(stderr, "winmidi channel specification %s does not conform to channel<X>.<control><Y>\n", spec);
		return NULL;
	}

	next_token++;

	if(!strncmp(next_token, "cc", 2)){
		ident.fields.type = cc;
		next_token += 2;
	}
	else if(!strncmp(next_token, "note", 4)){
		ident.fields.type = note;
		next_token += 4;
	}
	else if(!strncmp(next_token, "pressure", 8)){
		ident.fields.type = pressure;
		next_token += 8;
	}
	else if(!strncmp(next_token, "pitch", 5)){
		ident.fields.type = pitchbend;
	}
	else if(!strncmp(next_token, "aftertouch", 10)){
		ident.fields.type = aftertouch;
	}
	else{
		fprintf(stderr, "Unknown winmidi channel control type in %s\n", spec);
		return NULL;
	}

	ident.fields.control = strtoul(next_token, NULL, 10);

	if(ident.label){
		return mm_channel(inst, ident.label, 1);
	}
	return NULL;
}

static int winmidi_set(instance* inst, size_t num, channel** c, channel_value* v){
	winmidi_instance_data* data = (winmidi_instance_data*) inst->impl;
	winmidi_channel_ident ident = {
		.label = 0
	};
	union {
		struct {
			uint8_t status;
			uint8_t data1;
			uint8_t data2;
			uint8_t unused;
		} components;
		DWORD dword;
	} output = {
		.dword = 0
	};
	size_t u;

	//early exit
	if(!num){
		return 0;
	}

	if(!data->device_out){
		fprintf(stderr, "winmidi instance %s has no output device\n", inst->name);
		return 0;
	}

	for(u = 0; u < num; u++){
		ident.label = c[u]->ident;

		switch(ident.fields.type){
			case note:
				output.components.status = 0x90 | ident.fields.channel;
				output.components.data1 = ident.fields.control;
				output.components.data2 = v[u].normalised * 127.0;
				break;
			case cc:
				output.components.status = 0xB0 | ident.fields.channel;
				output.components.data1 = ident.fields.control;
				output.components.data2 = v[u].normalised * 127.0;
				break;
			case pressure:
				output.components.status = 0xA0 | ident.fields.channel;
				output.components.data1 = ident.fields.control;
				output.components.data2 = v[u].normalised * 127.0;
				break;
			case aftertouch:
				output.components.status = 0xD0 | ident.fields.channel;
				output.components.data1 = v[u].normalised * 127.0;
				output.components.data2 = 0;
				break;
			case pitchbend:
				output.components.status = 0xE0 | ident.fields.channel;
				output.components.data1 = ((int)(v[u].normalised * 16384.0)) & 0x7F;
				output.components.data2 = (((int)(v[u].normalised * 16384.0)) >> 7) & 0x7F;
				break;
			default:
				fprintf(stderr, "Unknown winmidi channel type %d\n", ident.fields.type);
				continue;
		}

		midiOutShortMsg(data->device_out, output.dword);
	}
	
	return 0;
}

static char* winmidi_type_name(uint8_t typecode){
	switch(typecode){
		case note:
			return "note";
		case cc:
			return "cc";
		case pressure:
			return "pressure";
		case aftertouch:
			return "aftertouch";
		case pitchbend:
			return "pitch";
	}
	return "unknown";
}

static int winmidi_handle(size_t num, managed_fd* fds){
	size_t u;
	ssize_t bytes = 0;
	char recv_buf[1024];
	channel* chan = NULL;
	if(!num){
		return 0;
	}

	//flush the feedback socket
	for(u = 0; u < num; u++){
		bytes += recv(fds[u].fd, recv_buf, sizeof(recv_buf), 0);
	}

	//push queued events
	EnterCriticalSection(&backend_config.push_events);
	for(u = 0; u < backend_config.events_active; u++){
		if(backend_config.detect){
			//pretty-print channel-wide events
			if(backend_config.event[u].channel.fields.type == pitchbend
					|| backend_config.event[u].channel.fields.type == aftertouch){
				fprintf(stderr, "Incoming MIDI data on channel %s.ch%d.%s, value %f\n",
						backend_config.event[u].inst->name,
						backend_config.event[u].channel.fields.channel,
						winmidi_type_name(backend_config.event[u].channel.fields.type),
						backend_config.event[u].value);
			}
			else{
				fprintf(stderr, "Incoming MIDI data on channel %s.ch%d.%s%d, value %f\n",
						backend_config.event[u].inst->name,
						backend_config.event[u].channel.fields.channel,
						winmidi_type_name(backend_config.event[u].channel.fields.type),
						backend_config.event[u].channel.fields.control,
						backend_config.event[u].value);
			}
		}
		chan = mm_channel(backend_config.event[u].inst, backend_config.event[u].channel.label, 0);
		if(chan){
			mm_channel_event(chan, backend_config.event[u].value);
		}
	}
	DBGPF("winmidi flushed %" PRIsize_t " wakeups, handled %" PRIsize_t " events\n", bytes, backend_config.events_active);
	backend_config.events_active = 0;
	LeaveCriticalSection(&backend_config.push_events);
	return 0;
}

static void CALLBACK winmidi_input_callback(HMIDIIN device, unsigned message, DWORD_PTR inst, DWORD param1, DWORD param2){
	winmidi_channel_ident ident = {
		.label = 0
	};
	channel_value val;
	union {
		struct {
			uint8_t status;
			uint8_t data1;
			uint8_t data2;
			uint8_t unused;
		} components;
		DWORD dword;
	} input = {
		.dword = 0
	};

	//callbacks may run on different threads, so we queue all events and alert the main thread via the feedback socket
	DBGPF("winmidi input callback on thread %ld\n", GetCurrentThreadId());

	switch(message){
		case MIM_MOREDATA:
			//processing too slow, do not immediately alert the main loop
		case MIM_DATA:
			//param1 has the message
			input.dword = param1;
			ident.fields.channel = input.components.status & 0x0F;
			switch(input.components.status & 0xF0){
				case 0x80:
					ident.fields.type = note;
					ident.fields.control = input.components.data1;
					val.normalised = 0.0;
					break;
				case 0x90:
					ident.fields.type = note;
					ident.fields.control = input.components.data1;
					val.normalised = (double) input.components.data2 / 127.0;
					break;
				case 0xA0:
					ident.fields.type = pressure;
					ident.fields.control = input.components.data1;
					val.normalised = (double) input.components.data2 / 127.0;
					break;
				case 0xB0:
					ident.fields.type = cc;
					ident.fields.control = input.components.data1;
					val.normalised = (double) input.components.data2 / 127.0;
					break;
				case 0xD0:
					ident.fields.type = aftertouch;
					ident.fields.control = 0;
					val.normalised = (double) input.components.data1 / 127.0;
					break;
				case 0xE0:
					ident.fields.type = pitchbend;
					ident.fields.control = 0;
					val.normalised = (double)((input.components.data2 << 7) | input.components.data1) / 16384.0;
					break;
				default:
					fprintf(stderr, "winmidi unhandled status byte %02X\n", input.components.status);
					return;
			}
			break;
		case MIM_LONGDATA:
			//sysex message, ignore
			return;
		case MIM_ERROR:
			//error in input stream
			fprintf(stderr, "winmidi warning: error in input stream\n");
			return;
		case MIM_OPEN:
		case MIM_CLOSE:
			//device opened/closed
			return;
		
	}

	DBGPF("winmidi incoming message type %d channel %d control %d value %f\n",
			ident.fields.type, ident.fields.channel, ident.fields.control, val.normalised);

	EnterCriticalSection(&backend_config.push_events);
	if(backend_config.events_alloc <= backend_config.events_active){
		backend_config.event = realloc((void*) backend_config.event, (backend_config.events_alloc + 1) * sizeof(winmidi_event));
		if(!backend_config.event){
			fprintf(stderr, "Failed to allocate memory\n");
			backend_config.events_alloc = 0;
			backend_config.events_active = 0;
			LeaveCriticalSection(&backend_config.push_events);
			return;
		}
		backend_config.events_alloc++;
	}
	backend_config.event[backend_config.events_active].inst = (instance*) inst;
	backend_config.event[backend_config.events_active].channel.label = ident.label;
	backend_config.event[backend_config.events_active].value = val;
	backend_config.events_active++;
	LeaveCriticalSection(&backend_config.push_events);

	if(message != MIM_MOREDATA){
		//alert the main loop
		send(backend_config.socket_pair[1], "w", 1, 0);
	}
}

static void CALLBACK winmidi_output_callback(HMIDIOUT device, unsigned message, DWORD_PTR inst, DWORD param1, DWORD param2){
	DBGPF("winmidi output callback on thread %ld\n", GetCurrentThreadId());
}

static int winmidi_match_input(char* prefix){
	MIDIINCAPS input_caps;
	unsigned inputs = midiInGetNumDevs();
	char* next_token = NULL;
	size_t n;

	if(!prefix){
		fprintf(stderr, "winmidi detected %u input devices\n", inputs);
	}
	else{
		n = strtoul(prefix, &next_token, 10);
		if(!(*next_token) && n < inputs){
			midiInGetDevCaps(n, &input_caps, sizeof(MIDIINCAPS));
			fprintf(stderr, "winmidi selected input device %s for ID %d\n", input_caps.szPname, n);
			return n;
		}
	}

	//find prefix match for input device
	for(n = 0; n < inputs; n++){
		midiInGetDevCaps(n, &input_caps, sizeof(MIDIINCAPS));
		if(!prefix){
			printf("\tID %d: %s\n", n, input_caps.szPname);
		}
		else if(!strncmp(input_caps.szPname, prefix, strlen(prefix))){
			fprintf(stderr, "winmidi selected input device %s (ID %" PRIsize_t ") for name %s\n", input_caps.szPname, n, prefix);
			return n;
		}
	}

	return -1;
}

static int winmidi_match_output(char* prefix){
	MIDIOUTCAPS output_caps;
	unsigned outputs = midiOutGetNumDevs();
	char* next_token = NULL;
	size_t n;

	if(!prefix){
		fprintf(stderr, "winmidi detected %u output devices\n", outputs);
	}
	else{
		n = strtoul(prefix, &next_token, 10);
		if(!(*next_token) && n < outputs){
			midiOutGetDevCaps(n, &output_caps, sizeof(MIDIOUTCAPS));
			fprintf(stderr, "winmidi selected output device %s for ID %d\n", output_caps.szPname, n);
			return n;
		}
	}

	//find prefix match for output device
	for(n = 0; n < outputs; n++){
		midiOutGetDevCaps(n, &output_caps, sizeof(MIDIOUTCAPS));
		if(!prefix){
			printf("\tID %d: %s\n", n, output_caps.szPname);
		}
		else if(!strncmp(output_caps.szPname, prefix, strlen(prefix))){
			fprintf(stderr, "winmidi selected output device %s (ID %" PRIsize_t " for name %s\n", output_caps.szPname, n, prefix);
			return n;
		}
	}

	return -1;
}

static int winmidi_start(){
	size_t n = 0, p;
	int device, rv = -1;
	instance** inst = NULL;
	winmidi_instance_data* data = NULL;
	struct sockaddr_storage sockadd = {
		0
	};
	//this really should be a size_t but getsockname specifies int* for some reason
	int sockadd_len = sizeof(sockadd);
	char* error = NULL;
	DBGPF("winmidi main thread ID is %ld\n", GetCurrentThreadId());

	//fetch all instances
	if(mm_backend_instances(BACKEND_NAME, &n, &inst)){
		fprintf(stderr, "Failed to fetch instance list\n");
		return 1;
	}

	//no instances, we're done
	if(!n){
		free(inst);
		return 0;
	}

	//output device list if requested
	if(backend_config.list_devices){
		winmidi_match_input(NULL);
		winmidi_match_output(NULL);
	}

	//open the feedback sockets
	//for some reason the feedback connection fails to work on 'real' windows with ipv6
	backend_config.socket_pair[0] = mmbackend_socket("127.0.0.1", "0", SOCK_DGRAM, 1, 0);
	if(backend_config.socket_pair[0] < 0){
		fprintf(stderr, "winmidi failed to open feedback socket\n");
		return 1;
	}
	if(getsockname(backend_config.socket_pair[0], (struct sockaddr*) &sockadd, &sockadd_len)){
		FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
			NULL, WSAGetLastError(), MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), (LPTSTR) &error, 0, NULL);
		fprintf(stderr, "winmidi failed to query feedback socket information: %s\n", error);
		LocalFree(error);
		return 1;
	}
	//getsockname on 'real' windows may not set the address - works on wine, though
	switch(sockadd.ss_family){
		case AF_INET:
		case AF_INET6:
			((struct sockaddr_in*) &sockadd)->sin_family = AF_INET;
			((struct sockaddr_in*) &sockadd)->sin_addr.s_addr = htobe32(INADDR_LOOPBACK);
			break;
		//for some absurd reason 'real' windows announces the socket as AF_INET6 but rejects any connection unless its AF_INET
//		case AF_INET6:
//			((struct sockaddr_in6*) &sockadd)->sin6_addr = in6addr_any;
//			break;
		default:
			fprintf(stderr, "winmidi invalid feedback socket family\n");
			return 1;
	}
	DBGPF("winmidi feedback socket family %d port %d\n", sockadd.ss_family, be16toh(((struct sockaddr_in*)&sockadd)->sin_port));
	backend_config.socket_pair[1] = socket(sockadd.ss_family, SOCK_DGRAM, IPPROTO_UDP);
	if(backend_config.socket_pair[1] < 0 || connect(backend_config.socket_pair[1], (struct sockaddr*) &sockadd, sockadd_len)){
		FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
			NULL, WSAGetLastError(), MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), (LPTSTR) &error, 0, NULL);
		fprintf(stderr, "winmidi failed to connect to feedback socket: %s\n", error);
		LocalFree(error);
		return 1;
	}

	//set up instances and start input
	for(p = 0; p < n; p++){
		data = (winmidi_instance_data*) inst[p]->impl;
		inst[p]->ident = p;

		//connect input device if requested
		if(data->read){
			device = winmidi_match_input(data->read);
			if(device < 0){
				fprintf(stderr, "Failed to match input device %s for instance %s\n", data->read, inst[p]->name);
				goto bail;
			}
			if(midiInOpen(&(data->device_in), device, (DWORD_PTR) winmidi_input_callback, (DWORD_PTR) inst[p], CALLBACK_FUNCTION | MIDI_IO_STATUS) != MMSYSERR_NOERROR){
				fprintf(stderr, "Failed to open input device for instance %s\n", inst[p]->name);
				goto bail;
			}
			//start midi input callbacks
			midiInStart(data->device_in);
		}

		//connect output device if requested
		if(data->write){
			device = winmidi_match_output(data->write);
			if(device < 0){
				fprintf(stderr, "Failed to match output device %s for instance %s\n", data->read, inst[p]->name);
				goto bail;
			}
			if(midiOutOpen(&(data->device_out), device, (DWORD_PTR) winmidi_output_callback, (DWORD_PTR) inst[p], CALLBACK_FUNCTION) != MMSYSERR_NOERROR){
				fprintf(stderr, "Failed to open output device for instance %s\n", inst[p]->name);
				goto bail;
			}
		}
	}

	//register the feedback socket to the core
	fprintf(stderr, "winmidi backend registering 1 descriptor to core\n");
	if(mm_manage_fd(backend_config.socket_pair[0], BACKEND_NAME, 1, NULL)){
		goto bail;
	}

	rv = 0;
bail:
	free(inst);
	return rv;
}

static int winmidi_shutdown(){
	size_t n, u;
	instance** inst = NULL;
	winmidi_instance_data* data = NULL;

	if(mm_backend_instances(BACKEND_NAME, &n, &inst)){
		fprintf(stderr, "Failed to fetch instance list\n");
		return 1;
	}

	for(u = 0; u < n; u++){
		data = (winmidi_instance_data*) inst[u]->impl;
		free(data->read);
		data->read = NULL;
		free(data->write);
		data->write = NULL;

		if(data->device_in){
			midiInStop(data->device_in);
			midiInClose(data->device_in);
			data->device_in = NULL;
		}

		if(data->device_out){
			midiOutReset(data->device_out);
			midiOutClose(data->device_out);
			data->device_out = NULL;
		}
	}

	free(inst);
	closesocket(backend_config.socket_pair[0]);
	closesocket(backend_config.socket_pair[1]);

	EnterCriticalSection(&backend_config.push_events);
	free((void*) backend_config.event);
	backend_config.event = NULL;
	backend_config.events_alloc = 0;
	backend_config.events_active = 0;
	LeaveCriticalSection(&backend_config.push_events);
	DeleteCriticalSection(&backend_config.push_events);

	fprintf(stderr, "winmidi backend shut down\n");
	return 0;
}