aboutsummaryrefslogtreecommitdiff
path: root/backends/midi/seq.cpp
blob: 55c8239562cfba1f323a61dc2f142d893bd13f3d (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
/* 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.
 *
 * $URL$
 * $Id$
 */

/*
 * Raw output support by Michael Pearce
 * Alsa support by Nicolas Noble <nicolas@nobis-crew.org> copied from
 *    both the QuickTime support and (vkeybd http://www.alsa-project.org/~iwai/alsa.html)
 */

#if defined(UNIX) && !defined(__BEOS__) && !defined(__MAEMO__) && !defined(__MINT__)

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

#include <fcntl.h>
#include <unistd.h>

////////////////////////////////////////
//
// Unix dev/sequencer driver
//
////////////////////////////////////////

#define SEQ_MIDIPUTC 5

class MidiDriver_SEQ : public MidiDriver_MPU401 {
public:
	MidiDriver_SEQ();
	int open();
	void close();
	void send(uint32 b);
	void sysEx(const byte *msg, uint16 length);

private:
	bool _isOpen;
	int device, _device_num;
};

MidiDriver_SEQ::MidiDriver_SEQ() {
	_isOpen = false;
	device = 0;
	_device_num = 0;
}

int MidiDriver_SEQ::open() {
	char *device_name;
	char dev_seq[] = "/dev/sequencer";

	if (_isOpen)
		return MERR_ALREADY_OPEN;
	_isOpen = true;
	device = 0;

	device_name = getenv("SCUMMVM_MIDI");

	if (device_name == NULL) {
		warning("SCUMMVM_MIDI environment variable not set, using /dev/sequencer");
		device_name = dev_seq;
	}

	device = (::open((device_name), O_RDWR, 0));

	if ((device_name == NULL) || (device < 0)) {
		if (device_name == NULL)
			warning("Opening /dev/null (no music will be heard) ");
		else
			warning("Cannot open rawmidi device %s - using /dev/null (no music will be heard) ",
							device_name);
		device = (::open(("/dev/null"), O_RDWR, 0));
		if (device < 0)
			error("Cannot open /dev/null to dump midi output");
	}

	if (getenv("SCUMMVM_MIDIPORT"))
		_device_num = atoi(getenv("SCUMMVM_MIDIPORT"));
	return 0;
}

void MidiDriver_SEQ::close() {
	MidiDriver_MPU401::close();
	::close(device);
	_isOpen = false;
}

void MidiDriver_SEQ::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_SEQ::send: unknown : %08x", (int)b);
		break;
	}
	(void)write(device, buf, position);
}

void MidiDriver_SEQ::sysEx (const byte *msg, uint16 length) {
	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;

	(void)write(device, buf, position);
}


// Plugin interface

class SeqMusicPlugin : public MusicPluginObject {
public:
	const char *getName() const {
		return "SEQ";
	}

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

	MusicDevices getDevices() const;
	Common::Error createInstance(MidiDriver **mididriver) const;
};

MusicDevices SeqMusicPlugin::getDevices() const {
	MusicDevices devices;
	// TODO: Return a different music type depending on the configuration
	// TODO: List the available devices
	devices.push_back(MusicDevice(this, "", MT_GM));
	return devices;
}

Common::Error SeqMusicPlugin::createInstance(MidiDriver **mididriver) const {
	*mididriver = new MidiDriver_SEQ();

	return Common::kNoError;
}

MidiDriver *MidiDriver_SEQ_create() {
	MidiDriver *mididriver;

	SeqMusicPlugin p;
	p.createInstance(&mididriver);

	return mididriver;
}

//#if PLUGIN_ENABLED_DYNAMIC(SEQ)
	//REGISTER_PLUGIN_DYNAMIC(SEQ, PLUGIN_TYPE_MUSIC, SeqMusicPlugin);
//#else
	REGISTER_PLUGIN_STATIC(SEQ, PLUGIN_TYPE_MUSIC, SeqMusicPlugin);
//#endif

#endif