aboutsummaryrefslogtreecommitdiff
path: root/backends/midi/timidity.cpp
blob: ade73c0f8a25bd6227dbc06b90459a211d2e849d (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
/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * $URL$
 * $Id$
 */

/*
 * Output to TiMidity++ MIDI server support
 *                            by Dmitry Marakasov <amdmi3@amdmi3.ru>
 * based on:
 * - Raw output support (seq.cpp) by Michael Pearce
 * - Pseudo /dev/sequencer of TiMidity (timidity-io.c)
 *                                 by Masanao Izumo <mo@goice.co.jp>
 * - sys/soundcard.h by Hannu Savolainen (got from my FreeBSD
 *   distribution, for which it was modified by Luigi Rizzo)
 *
 */

#if defined (UNIX)

#include "common/util.h"
#include "sound/musicplugin.h"
#include "sound/mpu401.h"

#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/param.h>
#include <netdb.h>		/* for gethostbyname */
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdarg.h>
#include <stdlib.h>
#include <errno.h>

// WORKAROUND bug #1870304: Solaris does not provide INADDR_NONE.
#ifndef INADDR_NONE
#define INADDR_NONE 0xffffffff
#endif

#define SEQ_MIDIPUTC 5

#define TIMIDITY_LOW_DELAY

#ifdef TIMIDITY_LOW_DELAY
#define BUF_LOW_SYNC	0.1
#define BUF_HIGH_SYNC	0.15
#else
#define BUF_LOW_SYNC	0.4
#define BUF_HIGH_SYNC	0.8
#endif

/* default host & port */
#define DEFAULT_TIMIDITY_HOST "127.0.0.1"
#define DEFAULT_TIMIDITY_PORT 7777

class MidiDriver_TIMIDITY : public MidiDriver_MPU401 {
public:
	MidiDriver_TIMIDITY();

	int	open();
	void	close();
	void	send(uint32 b);
	void	sysEx(const byte *msg, uint16 length);

private:
	/* standart routine to extract ip address from a string */
	in_addr_t	host_to_addr(const char* address);

	/* creates a tcp connection to TiMidity server, returns filedesc (like open()) */
	int	connect_to_server(const char* hostname, unsigned short tcp_port);

	/* send command to the server; printf-like; returns reply string */
	char	*timidity_ctl_command(const char *fmt, ...);

	/* timidity data socket-related stuff */
	void	timidity_meta_seq(int p1, int p2, int p3);
	int	timidity_sync(int centsec);
	int	timidity_eot();

	/* write() analogue for any midi data */
	void	timidity_write_data(const void *buf, size_t nbytes);

	/* get single line of server reply on control connection */
	int	fdgets(char *buff, size_t buff_size);

	/* teardown connection to server */
	void	teardown();

	/* close (if needed) and nullify both control and data filedescs */
	void	close_all();

private:
	bool	_isOpen;
	int	_device_num;

	int	_control_fd;
	int	_data_fd;

	/* buffer for partial data read from _control_fd - from timidity-io.c, see fdgets() */
	char	_controlbuffer[BUFSIZ];
	int	_controlbuffer_count;	/* beginning of read pointer */
	int	_controlbuffer_size;	/* end of read pointer */
};

MidiDriver_TIMIDITY::MidiDriver_TIMIDITY() {
	_isOpen = false;
	_device_num = 0;

	/* init fd's */
	_control_fd = _data_fd = -1;

	/* init buffer for control connection */
	_controlbuffer_count = _controlbuffer_size = 0;
}

int MidiDriver_TIMIDITY::open() {
	char	*res;
	char	timidity_host[MAXHOSTNAMELEN];
	int	timidity_port, data_port, i;

	/* count ourselves open */
	if (_isOpen)
		return MERR_ALREADY_OPEN;
	_isOpen = true;

	/* get server hostname; if not specified in env, use default */
	if ((res = getenv("TIMIDITY_HOST")) == NULL)
		strncpy(timidity_host, DEFAULT_TIMIDITY_HOST, MAXHOSTNAMELEN);
	else
		strncpy(timidity_host, res, sizeof(timidity_host));

	timidity_host[sizeof(timidity_host) - 1] = '\0';

	/* extract control port */
	if ((res = strrchr(timidity_host, ':')) != NULL) {
		*res++ = '\0';
		timidity_port = atoi(res);
	} else {
		timidity_port = DEFAULT_TIMIDITY_PORT;
	}

	/*
	 * create control connection to the server
	 */
	if ((_control_fd = connect_to_server(timidity_host, timidity_port)) < 0) {
		warning("TiMidity: can't open control connection (host=%s, port=%d)", timidity_host, timidity_port);
		return -1;
	}

	/* should read greeting issued by server upon connect:
	 * "220 TiMidity++ v2.13.2 ready)" */
	res = timidity_ctl_command(NULL);
	if (atoi(res) != 220) {
		warning("TiMidity: bad response from server (host=%s, port=%d): %s", timidity_host, timidity_port, res);
		close_all();
		return -1;
	}

	/*
	 * setup buf and prepare data connection
	 */
	/* should read: "200 OK" */
	res = timidity_ctl_command("SETBUF %f %f", BUF_LOW_SYNC, BUF_HIGH_SYNC);
	if (atoi(res) != 200)
		warning("TiMidity: bad reply for SETBUF command: %s", res);

	/* should read something like "200 63017 is ready acceptable",
	 * where 63017 is port for data connection */
	i = 1;
	if (*(char *)&i == 1)
		res = timidity_ctl_command("OPEN lsb");
	else
		res = timidity_ctl_command("OPEN msb");

	if (atoi(res) != 200) {
		warning("TiMidity: bad reply for OPEN command: %s", res);
		close_all();
		return -1;
	}

	/*
	 * open data connection
	 */
	data_port = atoi(res + 4);
	if ((_data_fd = connect_to_server(timidity_host, data_port)) < 0) {
		warning("TiMidity: can't open data connection (host=%s, port=%d)", timidity_host, data_port);
		close_all();
		return -1;
	}

	/* should read message issued after connecting to data port:
	 * "200 Ready data connection" */
	res = timidity_ctl_command(NULL);
	if (atoi(res) != 200) {
		fprintf(stderr, "Can't connect timidity: %s\t(host=%s, port=%d)\n", res, timidity_host, data_port);
		close_all();
		return -1;
	}

	/*
	 * From seq.cpp
	 */
	if (getenv("SCUMMVM_MIDIPORT"))
		_device_num = atoi(getenv("SCUMMVM_MIDIPORT"));

	return 0;
}

void MidiDriver_TIMIDITY::close() {
	teardown();

	MidiDriver_MPU401::close();
	_isOpen = false;
}

void MidiDriver_TIMIDITY::close_all() {
	if (_control_fd >= 0)
		::close(_control_fd);

	if (_data_fd >= 0)
		::close(_data_fd);

	_control_fd = _data_fd = -1;
}

void MidiDriver_TIMIDITY::teardown() {
	char *res;

	/* teardown connection to server (see timidity-io.c) if it
	 * is initialized */
	if (_data_fd >= 0 && _control_fd >= 0) {
		timidity_eot();
		timidity_sync(0);

		/* scroll through all "302 Data connection is (already) closed"
		 * messages till we reach something like "200 Bye" */
		do {
			res = timidity_ctl_command("QUIT");
		} while (*res && atoi(res) && atoi(res) != 302);
	}

	/* now close and nullify both filedescs */
	close_all();
}

in_addr_t MidiDriver_TIMIDITY::host_to_addr(const char* address) {
	in_addr_t addr;
	struct hostent *hp;

	/* first check if IP address is given (like 127.0.0.1)*/
	if ((addr = inet_addr(address)) != INADDR_NONE)
		return addr;

	/* if not, try to resolve a hostname */
	if ((hp = gethostbyname(address)) == NULL) {
		warning("TiMidity: unknown hostname: %s", address);
		return INADDR_NONE;
	}

	memcpy(&addr, hp->h_addr, (int)sizeof(in_addr_t) <= hp->h_length ? sizeof(in_addr_t) : hp->h_length);

	return addr;
}

int MidiDriver_TIMIDITY::connect_to_server(const char* hostname, unsigned short tcp_port) {
	int fd;
	struct sockaddr_in in;
	unsigned int addr;

	/* create socket */
	if ((fd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
		warning("TiMidity: socket(): %s", strerror(errno));
		return -1;
	}

	/* connect */
	memset(&in, 0, sizeof(in));
	in.sin_family = AF_INET;
	in.sin_port   = htons(tcp_port);
	addr = host_to_addr(hostname);
	memcpy(&in.sin_addr, &addr, 4);

	if (connect(fd, (struct sockaddr *)&in, sizeof(in)) < 0) {
		warning("TiMidity: connect(): %s", strerror(errno));
		return -1;
	}

	return fd;
}

char *MidiDriver_TIMIDITY::timidity_ctl_command(const char *fmt, ...) {
	/* XXX: I don't like this static buffer!!! */
	static char buff[BUFSIZ];
	int status, len;
	va_list ap;

	if (fmt != NULL) {
		/* if argumends are present, write them to control connection */
		va_start(ap, fmt);
		len = vsnprintf(buff, BUFSIZ-1, fmt, ap); /* leave one byte for \n */
		va_end(ap);

		/* add newline if needed */
		if (len > 0 && buff[len - 1] != '\n')
			buff[len++] = '\n';

		/* write command to control socket */
		write(_control_fd, buff, len);
	}

	while (1) {
		/* read reply */
		if (fdgets(buff, sizeof(buff)) <= 0) {
			strcpy(buff, "Read error\n");
			break;
		}

		/* report errors from server */
		status = atoi(buff);
		if (400 <= status && status <= 499) { /* Error of data stream */
			warning("TiMidity: error from server: %s", buff);
			continue;
		}
		break;
	}

	return buff;
}

void MidiDriver_TIMIDITY::timidity_meta_seq(int p1, int p2, int p3) {
	/* see _CHN_COMMON from soundcard.h; this is simplified
	 * to just send seq to the server without any buffers,
	 * delays and extra functions/macros */
	u_char seqbuf[8];

	seqbuf[0] = 0x92;
	seqbuf[1] = 0;
	seqbuf[2] = 0xff;
	seqbuf[3] = 0x7f;
	seqbuf[4] = p1;
	seqbuf[5] = p2;
	*(short *)&seqbuf[6] = p3;

	timidity_write_data(seqbuf, sizeof(seqbuf));
}

int MidiDriver_TIMIDITY::timidity_sync(int centsec) {
	char *res;
	int status;
	unsigned long sleep_usec;

	timidity_meta_seq(0x02, 0x00, centsec); /* Wait playout */

	/* Wait "301 Sync OK" */
	do {
		res = timidity_ctl_command(NULL);
		status = atoi(res);

		if (status != 301)
			warning("TiMidity: error: SYNC: %s", res);

	} while (status && status != 301);

	if (status != 301)
		return -1; /* error */

	sleep_usec = (unsigned long)(atof(res + 4) * 1000000);

	if (sleep_usec > 0)
		usleep(sleep_usec);

	return 0;
}

int MidiDriver_TIMIDITY::timidity_eot(void) {
	timidity_meta_seq(0x00, 0x00, 0); /* End of playing */
	return timidity_sync(0);
}

void MidiDriver_TIMIDITY::timidity_write_data(const void *buf, size_t nbytes) {
	/* nowhere to write... */
	if (_data_fd < 0)
		return;

	/* write, and disable everything if write failed */
	/* TODO: add reconnect? */
	if (write(_data_fd, buf, nbytes) == -1) {
		warning("TiMidity: DATA WRITE FAILED (%s), DISABLING MUSIC OUTPUT", strerror(errno));
		close_all();
	}
}

int MidiDriver_TIMIDITY::fdgets(char *buff, size_t buff_size) {
	int n, len, count, size;
	char *buff_endp = buff + buff_size - 1, *pbuff, *beg;

	len = 0;
	count = _controlbuffer_count;
	size = _controlbuffer_size;
	pbuff = _controlbuffer;
	beg = buff;
	do {
		if (count == size) {
			if ((n = read(_control_fd, pbuff, BUFSIZ)) <= 0) {
				*buff = '\0';
				if (n == 0) {
					_controlbuffer_count = _controlbuffer_size = 0;
					return buff - beg;
				}
				return -1; /* < 0 error */
			}
			count = _controlbuffer_count = 0;
			size = _controlbuffer_size = n;
		}
		*buff++ = pbuff[count++];
	} while (*(buff - 1) != '\n' && buff != buff_endp);

	*buff = '\0';
	_controlbuffer_count = count;

	return buff - beg;
}

void MidiDriver_TIMIDITY::send(uint32 b) {
	unsigned char buf[256];
	int position = 0;

	switch (b & 0xF0) {
	case 0x80:
	case 0x90:
	case 0xA0:
	case 0xB0:
	case 0xE0:
		buf[position++] = SEQ_MIDIPUTC;
		buf[position++] = (unsigned char)b;
		buf[position++] = _device_num;
		buf[position++] = 0;
		buf[position++] = SEQ_MIDIPUTC;
		buf[position++] = (unsigned char)((b >> 8) & 0x7F);
		buf[position++] = _device_num;
		buf[position++] = 0;
		buf[position++] = SEQ_MIDIPUTC;
		buf[position++] = (unsigned char)((b >> 16) & 0x7F);
		buf[position++] = _device_num;
		buf[position++] = 0;
		break;
	case 0xC0:
	case 0xD0:
		buf[position++] = SEQ_MIDIPUTC;
		buf[position++] = (unsigned char)b;
		buf[position++] = _device_num;
		buf[position++] = 0;
		buf[position++] = SEQ_MIDIPUTC;
		buf[position++] = (unsigned char)((b >> 8) & 0x7F);
		buf[position++] = _device_num;
		buf[position++] = 0;
		break;
	default:
		warning("MidiDriver_TIMIDITY::send: unknown : %08x", (int)b);
		break;
	}

	timidity_write_data(buf, position);
}

void MidiDriver_TIMIDITY::sysEx(const byte *msg, uint16 length) {
	fprintf(stderr, "Timidity::sysEx\n");
	unsigned char buf[266*4];
	int position = 0;
	const byte *chr = msg;

	assert(length + 2 <= 266);

	buf[position++] = SEQ_MIDIPUTC;
	buf[position++] = 0xF0;
	buf[position++] = _device_num;
	buf[position++] = 0;
	for (; length; --length, ++chr) {
		buf[position++] = SEQ_MIDIPUTC;
		buf[position++] = (unsigned char) *chr & 0x7F;
		buf[position++] = _device_num;
		buf[position++] = 0;
	}
	buf[position++] = SEQ_MIDIPUTC;
	buf[position++] = 0xF7;
	buf[position++] = _device_num;
	buf[position++] = 0;

	timidity_write_data(buf, position);
}


// Plugin interface

class TimidityMusicPlugin : public MusicPluginObject {
public:
	const char *getName() const {
		return "TiMidity";
	}

	const char *getId() const {
		return "timidity";
	}

	MusicDevices getDevices() const;
	Common::Error createInstance(Audio::Mixer *mixer, MidiDriver **mididriver) const;
};

MusicDevices TimidityMusicPlugin::getDevices() const {
	MusicDevices devices;
	devices.push_back(MusicDevice(this, "", MT_GM));
	return devices;
}

Common::Error TimidityMusicPlugin::createInstance(Audio::Mixer *mixer, MidiDriver **mididriver) const {
	*mididriver = new MidiDriver_TIMIDITY();

	return Common::kNoError;
}

MidiDriver *MidiDriver_TIMIDITY_create(Audio::Mixer *mixer) {
	MidiDriver *mididriver;

	TimidityMusicPlugin p;
	p.createInstance(mixer, &mididriver);

	return mididriver;
}

//#if PLUGIN_ENABLED_DYNAMIC(TIMIDITY)
	//REGISTER_PLUGIN_DYNAMIC(TIMIDITY, PLUGIN_TYPE_MUSIC, TimidityMusicPlugin);
//#else
	REGISTER_PLUGIN_STATIC(TIMIDITY, PLUGIN_TYPE_MUSIC, TimidityMusicPlugin);
//#endif

#endif // defined (UNIX)