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#include <stdlib.h>
#include <string.h>
#include "mutex.h"
#include "channel.h"
void mossrose_channel_init(struct mossrose_channel_t *chan)
{
mossrose_mutex_init(&(chan->mutex));
chan->left = NULL;
chan->right = NULL;
chan->n_samples = 0;
chan->pos = 0;
}
int mossrose_channel_set(struct mossrose_channel_t *chan, float *left, float *right, size_t len, int force)
{
int result = 0;
mossrose_mutex_lock(&(chan->mutex));
if (chan->n_samples != 0 && !force) {
/* channel is still playing! */
result = 1; goto unlock;
}
chan->n_samples = len;
chan->pos = 0;
/* left channel */
if (chan->left != NULL) free(chan->left);
if (left == NULL)
chan->left = NULL;
else {
chan->left = malloc(len * sizeof(float));
if (chan->left == NULL) { result = 2; goto unlock; }
memcpy(chan->left, left, len * sizeof(float));
}
/* right channel */
if (chan->right != NULL) free(chan->right);
if (right == NULL)
chan->right = NULL;
else {
chan->right = malloc(len * sizeof(float));
if (chan->right == NULL) { result = 3; goto unlock; }
memcpy(chan->right, right, len * sizeof(float));
}
unlock:
mossrose_mutex_unlock(&(chan->mutex));
return result;
}
void mossrose_channel_reset(struct mossrose_channel_t *chan)
{
chan->n_samples = 0;
chan->pos = 0;
}
int mossrose_channel_advance(float *left, float *right, struct mossrose_channel_t *chan)
{
if (chan->pos >= chan->n_samples) return 1;
if (chan->left != NULL)
*left = chan->left[chan->pos];
else
*left = 0;
if (chan->right != NULL)
*right = chan->right[chan->pos];
else
*right = 0;
chan->pos += 1;
return 0;
}
void mossrose_channel_destroy(struct mossrose_channel_t *chan)
{
mossrose_mutex_destroy(&(chan->mutex));
if (chan->left != NULL) free(chan->left);
if (chan->right != NULL) free(chan->right);
}
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