blob: 290a0b0eedaa6a43a16d039db7038909e76215d2 (
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
|
#ifndef SOUNDS_H_
#define SOUNDS_H_
#include <alsa/asoundlib.h>
#include <limits.h>
#include <math.h>
#include <pthread.h>
#include <stdbool.h>
#include "messages.h"
#include "midi_freqs.h"
#define check(ret) \
do { \
int res = (ret); \
if (res < 0) { \
fprintf(stderr, "%s:%d ERROR: %s (%d)\n", __FILE__, __LINE__, \
snd_strerror(res), res); \
exit(1); \
} \
} while (0)
#define SAMPLE_RATE 48000
#define PERIOD_SIZE 480
typedef struct {
snd_pcm_t *pcm;
message_queue *queue;
} sound_thread_meta;
typedef enum {
ENV_OFF,
ENV_ATTACK,
ENV_DECAY,
ENV_SUSTAIN,
ENV_RELEASE,
} envelope_state;
typedef struct {
int attack_time;
int decay_time;
float sustain_level;
int release_time;
} envelope_params;
typedef struct {
envelope_state state;
int counter;
float current_inc;
float release_value;
envelope_params params;
} envelope;
typedef struct {
bool active;
float freq;
float phase;
float phase_inc;
envelope envelope;
} synth_voice;
typedef struct {
synth_voice *buffer;
size_t size;
} synth_voices;
typedef struct {
oscilator_type oscilator_type;
float master_volume;
envelope_params envelope_params;
} synth_params;
typedef float (*oscilator_func)(float phase);
void *sound_thread_start(void *ptr);
int set_hw_params(snd_pcm_t *pcm);
#endif // SOUNDS_H_
|
