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
|
#include "midi.h"
#include "notes.h"
#include "control.h"
#include <string.h>
void midi_decode(uint32_t msg, synth_t * synth) {
// printf("MIDI message: 0x%X\n", msg);
uint8_t status = msg;
uint8_t data1 = (msg >> 8) & 0xFF;
uint8_t data2 = (msg >> 16) & 0xFF;
uint8_t channel = (status & 0x0F) + 1; // convert to human
uint8_t message = status >> 4;
switch (message) {
case 0x08:
// printf("Note Off: channel=%d, note=%d, velocity=%d\n", channel, data1, data2);
if (synth->n.key == data1) {
synth->n.noteOff = Pa_GetStreamTime(synth->stream);
}
synth->midi_note[data1].noteOff = Pa_GetStreamTime(synth->stream);
break;
case 0x09:
// printf("Note On: channel=%d, note=%d, velocity=%d\n", channel, data1, data2);
synth->n.key = data1;
synth->n.freq = notes[data1 % 12][(data1 / 12) % 8];
synth->n.noteOn = Pa_GetStreamTime(synth->stream);
synth->n.noteOff = 0;
synth->n.elapsed = 0;
synth->adsr.elapsed = 0;
synth->active = 1;
//synth->gain = data2 / 127.0;
//synth->midi_note[i].n = -1;
synth->midi_note[data1].freq = notes[data1 % 12][(data1 / 12) % 8];
synth->midi_note[data1].channel = channel;
synth->midi_note[data1].noteOn = Pa_GetStreamTime(synth->stream);
synth->midi_note[data1].noteOff = 0;
synth->midi_note[data1].velocity = (float)data2 / 127.0;
synth->midi_note[data1].elapsed = 0;
synth->midi_note[data1].active = 1;
break;
case 0x0A:
printf("Aftertouch: channel=%d, note=%d, pressure=%d\n", channel, data1, data2);
break;
case 0x0B:
// printf("Control Change: channel=%d, controller=%d, value=%d\n", channel, data1, data2);
int x = data2 < 64 ? 1 : -1;
switch (data1) {
case 0:
synth->adsr.a = synth->adsr.a + (x * 0.01);
//synth->freq_offset = synth->freq_offset + (x*5);
//cc_step(&synth->cc_cutoff, x);
break;
case 1:
synth->adsr.d = synth->adsr.d + (x * 0.01);
break;
case 2:
synth->adsr.s = synth->adsr.s + (x * 0.01);
break;
case 3:
synth->adsr.r = synth->adsr.r + (x * 0.01);
break;
case 4:
cc_step(&synth->cc_cutoff, x);
synth->cutoff = synth->cutoff + (x * (10 * log10(synth->cutoff)));
break;
case 5:
cc_step(&synth->cc_resonance, x);
break;
case 6:
cc_step(&synth->cc_pitch, x);
//synth->lfo.freq = synth->lfo.freq + (x * 0.1);
break;
case 7:
cc_reset(&synth->cc_pitch);
synth->lfo.amp = synth->lfo.amp + (x * 0.002);
break;
break;
case 28:
synth->filter = x - 1;
break;
case 29:
synth->multi = x - 1;
break;
default:
}
break;
case 0x0C:
printf("Program Change: channel=%d, program=%d\n", channel, data1);
break;
case 0x0D:
printf("Channel Pressure: channel=%d, pressure=%d\n", channel, data1);
break;
case 0x0E:
printf("Pitch Bend: channel=%d, value=%d\n", channel, ((data2 << 7) | data1) - 8192);
synth->n.freq = (((data2 << 7) | data1) - 8192);
break;
default:
printf("Unknown MIDI message\n");
break;
}
}
void
midiCallback(PtTimestamp timestamp, void *userData) {
midi_t * m = (midi_t *)userData;
if (!m->stream) return;
// if (!Pm_Poll(m->stream)) return;
PmEvent buf;
int e = Pm_Read(m->stream, &buf, 1);
if (e == 0) return; // nothing to do
if (e < 0) {
printf("Pm_Read error %d\n", e);
return;
}
//printf("%d\n", buf.message);
midi_decode(buf.message, m->synth);
}
void
init_midi(midi_t *m, synth_t *synth)
{
m->stream = NULL;
m->synth = synth;
Pm_Initialize();
printf("midi devs: %d\n", Pm_CountDevices());
const PmDeviceInfo *info;
int i;
for (i = 0; i < Pm_CountDevices(); i++) {
info = Pm_GetDeviceInfo(i);
printf("%d: %s [input: %d output: %d opened: %d is_virt:%d] (interf: %s) -- %d\n", i, info->name, info->input, info->output, info->opened, info->is_virtual, info->interf, Pm_GetDefaultInputDeviceID());
//if (!strcmp("MPK225 MIDI", info->name) && !info->input) break;
//if (!strcmp("MPK225 Port A", info->name) && info->input == 1) break;
//if (!strcmp("CH345 MIDI 1", info->name) && info->input == 1) break;
if (!strcmp("Midi Through Port-0", info->name) && info->input == 1) break;
}
Pt_Start(1, midiCallback, m);
Pm_OpenInput(&(m->stream),
i, //Pm_GetDefaultInputDeviceID(),
NULL,
128,
NULL,
NULL);
}
void
terminate_midi(midi_t *m)
{
Pm_Close(m->stream);
Pt_Stop();
Pm_Terminate();
}
|
