1 files changed, 85 insertions, 0 deletions
diff --git a/src/channel.c b/src/channel.c
new file mode 100644
index 0000000..169b245
--- /dev/null
+++ b/src/channel.c
@@ -0,0 +1,85 @@
+#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);
+}
+
+