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
|
#include <string.h>
#include <alsa/asoundlib.h>
#include "midi.h"
#define BACKEND_NAME "midi"
static snd_seq_t* sequencer = NULL;
int midi_init(){
backend midi = {
.name = BACKEND_NAME,
.conf = midi_configure,
.create = midi_instance,
.conf_instance = midi_configure_instance,
.channel = midi_channel,
.handle = midi_set,
.process = midi_handle,
.start = midi_start,
.shutdown = midi_shutdown
};
if(snd_seq_open(&sequencer, "default", SND_SEQ_OPEN_DUPLEX, 0) < 0){
fprintf(stderr, "Failed to open ALSA sequencer\n");
return 1;
}
//register backend
if(mm_backend_register(midi)){
fprintf(stderr, "Failed to register MIDI backend\n");
return 1;
}
return 0;
}
static int midi_configure(char* option, char* value){
if(!strcmp(option, "name")){
if(snd_seq_set_client_name(sequencer, value) < 0){
fprintf(stderr, "Failed to set MIDI client name to %s\n", value);
return 1;
}
return 0;
}
fprintf(stderr, "Unknown MIDI backend option %s\n", option);
return 1;
}
static instance* midi_instance(){
return mm_instance();
}
static int midi_configure_instance(instance* instance, char* option, char* value){
if(!strcmp(option, "device")){
//open i/o device
return 0;
}
else if(!strcmp(option, "port")){
//create midi port
return 0;
}
else if(!strcmp(option, "mode")){
//configure open mode
//FIXME needed?
return 0;
}
fprintf(stderr, "Unknown MIDI instance option %s\n", option);
return 1;
}
static channel* midi_channel(instance* instance, char* spec){
fprintf(stderr, "Parsing MIDI channelspec %s\n", spec);
//TODO
return NULL;
}
static int midi_set(size_t num, channel* c, channel_value* v){
//TODO
return 1;
}
static int midi_handle(size_t num, int* fd, void** data){
//TODO
return 1;
}
static int midi_start(){
return 1;
}
static int midi_shutdown(){
size_t n, p;
instance** inst = NULL;
if(mm_backend_instances(BACKEND_NAME, &n, &inst)){
fprintf(stderr, "Failed to fetch instance list\n");
return 1;
}
for(p = 0; p < n; p++){
free(inst[p]->impl);
}
free(inst);
//close midi
snd_seq_close(sequencer);
sequencer = NULL;
//free configuration cache
snd_config_update_free_global();
fprintf(stderr, "MIDI backend shut down\n");
return 0;
}
|
