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#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <plibsys.h>
#include "channel.h"
#include "sound.h"
#define channel_atomic_get(var) p_atomic_int_get(&(var))
#define channel_atomic_set(var, value) p_atomic_int_set(&(var), (value))
void channel_init(struct channel_t *chan)
{
chan->shared.active = false;
chan->shared.paused = false;
chan->shared.volume = 255;
chan->shared.pan_left = -128;
chan->shared.pan_right = 128;
chan->shared.trigger_callback = 0;
chan->sound_mutex = p_mutex_new();
chan->sound.left = NULL;
chan->sound.right = NULL;
chan->pos = 0;
chan->callback = NULL;
chan->userdata = NULL;
}
void channel_reset(struct channel_t *chan)
{
p_atomic_int_inc(&(chan->shared.trigger_callback));
if (p_atomic_int_get(&(chan->shared.trigger_callback)) > 32000)
/* prevent integer overflow */
p_atomic_int_set(&(chan->shared.trigger_callback), 1);
chan->pos = 0;
int loops = channel_atomic_get(chan->shared.loops);
if (loops) {
if (p_atomic_int_dec_and_test(&(chan->shared.loops)))
channel_atomic_set(chan->shared.active, false);
}
}
void channel_pause(struct channel_t *chan)
{
p_atomic_int_set(&(chan->shared.paused), true);
}
void channel_resume(struct channel_t *chan)
{
p_atomic_int_set(&(chan->shared.paused), false);
}
void channel_set_volume(struct channel_t *chan, float volume)
{
if (volume > 1.0f) volume = 1.0f;
if (volume < 0.0f) volume = 0.0f;
p_atomic_int_set(&(chan->shared.volume), 255*volume);
}
void channel_set_pan(struct channel_t *chan, float pan_left, float pan_right)
{
if (pan_left > 1.0f) pan_left = 1.0f;
if (pan_left < -1.0f) pan_left = -1.0f;
if (pan_right > 1.0f) pan_right = 1.0f;
if (pan_right < -1.0f) pan_right = -1.0f;
p_atomic_int_set(&(chan->shared.pan_left), 128*pan_left);
p_atomic_int_set(&(chan->shared.pan_right), 128*pan_right);
}
void channel_set_callback(struct channel_t *chan, channel_callback_t callback, void *userdata)
{
channel_atomic_set(chan->shared.trigger_callback, 0);
chan->callback = callback;
chan->userdata = userdata;
}
void channel_poll_callbacks(struct channel_t *chan, int index)
{
int trigger_callback = channel_atomic_get(chan->shared.trigger_callback);
while (trigger_callback) {
if (chan->callback != NULL) chan->callback(index, chan->userdata);
trigger_callback -= 1;
}
channel_atomic_set(chan->shared.trigger_callback, 0);
}
int channel_sound_load(struct channel_t *chan, struct mossrose_sound_t *sound, bool force, int loops)
{
if (!force && channel_atomic_get(chan->shared.active))
/* active, fail! */
return 1;
p_mutex_lock(chan->sound_mutex);
sound_copy(&(chan->sound), sound);
chan->pos = 0;
p_atomic_int_set(&(chan->shared.paused), false);
p_atomic_int_set(&(chan->shared.loops), loops);
if (!force) {
/* overwrite channel settings */
p_atomic_int_set(&(chan->shared.volume), 255);
if (sound->mono) {
p_atomic_int_set(&(chan->shared.pan_left), 0);
p_atomic_int_set(&(chan->shared.pan_right), 0);
}
else {
/* stereo */
p_atomic_int_set(&(chan->shared.pan_left), -128);
p_atomic_int_set(&(chan->shared.pan_right), 128);
}
}
p_mutex_unlock(chan->sound_mutex);
p_atomic_int_set(&(chan->shared.active), true);
return 0;
}
#define QUARTER_PI 0.785397
static void pan_gain(float *gain_l, float *gain_r, float pan)
{
float theta = (QUARTER_PI * pan) + QUARTER_PI; /* 0-PI/2 */
*gain_l = cos(theta);
*gain_r = sin(theta);
}
void channel_update_shared(struct channel_t *chan)
{
if (channel_atomic_get(chan->shared.paused) || !channel_atomic_get(chan->shared.active))
chan->skip = true;
else
chan->skip = false;
float vol = ((float)channel_atomic_get(chan->shared.volume))/255;
float pan_l = ((float)channel_atomic_get(chan->shared.pan_left))/128;
float pan_r = ((float)channel_atomic_get(chan->shared.pan_right))/128;
pan_gain(&(chan->gain_ll), &(chan->gain_lr), pan_l);
pan_gain(&(chan->gain_rl), &(chan->gain_rr), pan_r);
chan->gain_ll *= vol;
chan->gain_lr *= vol;
chan->gain_rl *= vol;
chan->gain_rr *= vol;
}
void channel_get_next_sample(float *left, float *right, struct channel_t *chan)
{
if (chan->skip) {
/* skip this channel */
*left = 0;
*right = 0;
return;
}
if (!p_mutex_trylock(chan->sound_mutex)) {
/* can't lock mutex, skip */
*left = 0;
*right = 0;
return;
}
if (chan->sound.mono) {
float x = chan->sound.left[chan->pos];
*left = chan->gain_ll * x;
*right = chan->gain_lr * x;
}
else {
float l, r;
l = chan->sound.left[chan->pos];
r = chan->sound.right[chan->pos];
*left = (chan->gain_ll * l) + (chan->gain_rl * r);
*right = (chan->gain_lr * l) + (chan->gain_rr * r);
}
chan->pos += 1;
if (chan->pos >= chan->sound.len) {
channel_reset(chan);
}
p_mutex_unlock(chan->sound_mutex);
}
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