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
|
/* ScummVM - Scumm Interpreter
* Copyright (C) 2001 Ludvig Strigeus
* Copyright (C) 2001-2006 The ScummVM project
*
* 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.
*
* $URL$
* $Id$
*/
#include "common/stdafx.h"
#include "common/scummsys.h"
#if defined(UNIX) && defined(USE_ALSA)
#include "sound/mpu401.h"
#include "common/stdafx.h"
#include "common/util.h"
#include "common/config-manager.h"
#include <alsa/asoundlib.h>
/*
* ALSA sequencer driver
* Mostly cut'n'pasted from Virtual Tiny Keyboard (vkeybd) by Takashi Iwai
* (you really rox, you know?)
*/
#if SND_LIB_MAJOR >= 1 || SND_LIB_MINOR >= 6
#define snd_seq_flush_output(x) snd_seq_drain_output(x)
#define snd_seq_set_client_group(x,name) /*nop */
#define my_snd_seq_open(seqp) snd_seq_open(seqp, "hw", SND_SEQ_OPEN_DUPLEX, 0)
#else
/* SND_SEQ_OPEN_OUT causes oops on early version of ALSA */
#define my_snd_seq_open(seqp) snd_seq_open(seqp, SND_SEQ_OPEN)
#endif
/*
* parse address string
*/
#define ADDR_DELIM ".:"
class MidiDriver_ALSA:public MidiDriver_MPU401 {
public:
MidiDriver_ALSA();
int open();
void close();
void send(uint32 b);
void sysEx(const byte *msg, uint16 length);
private:
void send_event(int do_flush);
bool _isOpen;
snd_seq_event_t ev;
snd_seq_t *seq_handle;
int seq_client, seq_port;
int my_client, my_port;
static int parse_addr(const char *arg, int *client, int *port);
};
MidiDriver_ALSA::MidiDriver_ALSA()
: _isOpen(false), seq_handle(0), seq_client(0), seq_port(0), my_client(0), my_port(0)
{
memset(&ev, 0, sizeof(ev));
}
int MidiDriver_ALSA::open() {
char *var;
if (_isOpen)
return MERR_ALREADY_OPEN;
_isOpen = true;
if (!(var = getenv("SCUMMVM_PORT"))) {
// use config option if no var specified
if (parse_addr(ConfMan.get("alsa_port").c_str(), &seq_client, &seq_port) < 0) {
error("Invalid port %s", var);
return -1;
}
} else {
if (parse_addr(var, &seq_client, &seq_port) < 0) {
error("Invalid port %s", var);
return -1;
}
}
if (my_snd_seq_open(&seq_handle) < 0) {
error("Can't open sequencer");
return -1;
}
my_client = snd_seq_client_id(seq_handle);
if (snd_seq_set_client_name(seq_handle, "SCUMMVM") < 0) {
error("Can't set sequencer client name");
}
snd_seq_set_client_group(seq_handle, "input");
my_port = snd_seq_create_simple_port(seq_handle, "SCUMMVM port 0",
SND_SEQ_PORT_CAP_WRITE | SND_SEQ_PORT_CAP_SUBS_WRITE |
SND_SEQ_PORT_CAP_READ, SND_SEQ_PORT_TYPE_MIDI_GENERIC);
if (my_port < 0) {
snd_seq_close(seq_handle);
error("Can't create port");
return -1;
}
if (seq_client != SND_SEQ_ADDRESS_SUBSCRIBERS) {
/* subscribe to MIDI port */
if (snd_seq_connect_to(seq_handle, my_port, seq_client, seq_port) < 0) {
error("Can't subscribe to MIDI port (%d:%d) see README for help", seq_client, seq_port);
}
else printf("Connected to Alsa sequencer client [%d:%d]\n", seq_client, seq_port);
}
printf("ALSA client initialised [%d:0]\n", my_client);
return 0;
}
void MidiDriver_ALSA::close() {
_isOpen = false;
MidiDriver_MPU401::close();
if (seq_handle)
snd_seq_close(seq_handle);
}
void MidiDriver_ALSA::send(uint32 b) {
unsigned int midiCmd[4];
ev.type = SND_SEQ_EVENT_OSS;
midiCmd[3] = (b & 0xFF000000) >> 24;
midiCmd[2] = (b & 0x00FF0000) >> 16;
midiCmd[1] = (b & 0x0000FF00) >> 8;
midiCmd[0] = (b & 0x000000FF);
ev.data.raw32.d[0] = midiCmd[0];
ev.data.raw32.d[1] = midiCmd[1];
ev.data.raw32.d[2] = midiCmd[2];
unsigned char chanID = midiCmd[0] & 0x0F;
switch (midiCmd[0] & 0xF0) {
case 0x80:
snd_seq_ev_set_noteoff(&ev, chanID, midiCmd[1], midiCmd[2]);
send_event(1);
break;
case 0x90:
snd_seq_ev_set_noteon(&ev, chanID, midiCmd[1], midiCmd[2]);
send_event(1);
break;
case 0xA0:
snd_seq_ev_set_keypress(&ev, chanID, midiCmd[1], midiCmd[2]);
send_event(1);
break;
case 0xB0:
/* is it this simple ? Wow... */
snd_seq_ev_set_controller(&ev, chanID, midiCmd[1], midiCmd[2]);
send_event(1);
break;
case 0xC0:
snd_seq_ev_set_pgmchange(&ev, chanID, midiCmd[1]);
send_event(0);
break;
case 0xD0:
snd_seq_ev_set_chanpress(&ev, chanID, midiCmd[1]);
send_event(1);
break;
case 0xE0:{
// long theBend = ((((long)midiCmd[1] + (long)(midiCmd[2] << 7))) - 0x2000) / 4;
// snd_seq_ev_set_pitchbend(&ev, chanID, theBend);
long theBend = ((long)midiCmd[1] + (long)(midiCmd[2] << 7)) - 0x2000;
snd_seq_ev_set_pitchbend(&ev, chanID, theBend);
send_event(1);
}
break;
default:
warning("Unknown MIDI Command: %08x", (int)b);
/* I don't know if this works but, well... */
send_event(1);
break;
}
}
void MidiDriver_ALSA::sysEx(const byte *msg, uint16 length) {
unsigned char buf[1024];
if (length > 254) {
warning("Cannot send SysEx block - data too large");
return;
}
buf[0] = 0xF0;
memcpy(buf + 1, msg, length);
buf[length + 1] = 0xF7;
snd_seq_ev_set_sysex(&ev, length + 2, &buf);
send_event(1);
}
int MidiDriver_ALSA::parse_addr(const char *arg, int *client, int *port) {
char *p;
if (isdigit(*arg)) {
if ((p = strpbrk(arg, ADDR_DELIM)) == NULL)
return -1;
*client = atoi(arg);
*port = atoi(p + 1);
} else {
if (*arg == 's' || *arg == 'S') {
*client = SND_SEQ_ADDRESS_SUBSCRIBERS;
*port = 0;
} else
return -1;
}
return 0;
}
void MidiDriver_ALSA::send_event(int do_flush) {
snd_seq_ev_set_direct(&ev);
snd_seq_ev_set_source(&ev, my_port);
snd_seq_ev_set_dest(&ev, seq_client, seq_port);
snd_seq_event_output(seq_handle, &ev);
if (do_flush)
snd_seq_flush_output(seq_handle);
}
MidiDriver *MidiDriver_ALSA_create() {
return new MidiDriver_ALSA();
}
#endif
|
