add channel_get_next_sample()

1 files changed, 30 insertions, 0 deletions

diff --git a/src/channel.c b/src/channel.c
index e6e6c3f..b9242c4 100644
--- a/src/channel.c
+++ b/src/channel.c
@@ -26,3 +26,33 @@ void channel_reset(struct channel_t *chan)
 	chan->pos = 0;
 	p_atomic_int_set(&(chan->active), false);
 }
+
+
+void channel_get_next_sample(float *left, float *right, struct channel_t *chan)
+{
+	bool active = p_atomic_int_get(&(chan->active));
+	bool paused = p_atomic_int_get(&(chan->paused));
+	if (!active || paused) {
+		/* 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;
+	}
+
+	*left = chan->sound.left[chan->pos];
+	*right = chan->sound.right[chan->pos];
+	chan->pos += 1;
+
+	if (chan->pos >= chan->sound.len) {
+		channel_reset(chan);
+	}
+
+	p_mutex_unlock(chan->sound_mutex);
+}