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#ifndef SOUNDS_H_
#define SOUNDS_H_
#include <alsa/asoundlib.h>
#include <limits.h>
#include <math.h>
#include <pthread.h>
#include <stdbool.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 MESSAGE_QUEUE_SIZE 128
#define SAMPLE_RATE 48000
#define PERIOD_SIZE 480
typedef enum {
PARAM_OSC,
PARAM_VOLUME,
} param_type;
typedef enum {
OSC_SINE,
OSC_SAW,
OSC_SQUARE,
OSC_TRIANGLE,
} oscilator_type;
typedef enum {
MSG_NOTE_ON,
MSG_NOTE_OFF,
MSG_ALL_NOTES_OFF,
MSG_PARAM_CHANGE,
MSG_STOP,
} synth_message_type;
typedef struct {
synth_message_type type;
union {
// NOTE_ON / NOTE_OFF
struct {
size_t note_id;
} note;
// SET_PARAM;
struct {
param_type param_type;
float value;
} param_change;
};
} synth_message;
typedef struct {
synth_message buffer[MESSAGE_QUEUE_SIZE];
size_t head;
size_t tail;
pthread_mutex_t lock;
} message_queue;
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 {
envelope_state state;
int counter;
int attack_time;
int decay_time;
float sustain_level;
int release_time;
float increases[3];
} 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;
} synth_params;
typedef float (*oscilator_func)(float phase);
int mqueue_get(message_queue *q, synth_message *msg);
int mqueue_push(message_queue *q, synth_message msg);
#define mqueue_init(q) \
do { \
(q)->head = (q)->tail = 0; \
pthread_mutex_init(&(q)->lock, NULL); \
} while (0)
/* #define mqueue_get(q, msg, ok) \ */
/* do { \ */
/* pthread_mutex_lock(&(q)->lock); \ */
/* if ((q)->tail == (q)->head) { \ */
/* pthread_mutex_unlock(&(q)->lock); \ */
/* *(ok) = false;\ */
/* break; \ */
/* } \ */
/* \ */
/* *(msg) = (q)->buffer[(q)->tail]; \ */
/* (q)->tail = ((q)->tail + 1) % MESSAGE_QUEUE_SIZE; \ */
/* \ */
/* pthread_mutex_unlock(&(q)->lock); \ */
/* *(ok) = true; \ */
/* } while (0) */
#define mqueue_empty(q) (q)->head == (q)->tail
void *sound_thread_start(void *ptr);
int set_hw_params(snd_pcm_t *pcm);
#endif // SOUNDS_H_
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