re-add noise gate

1 files changed, 17 insertions, 0 deletions

diff --git a/mumd/src/audio/transformers.rs b/mumd/src/audio/transformers.rs
new file mode 100644
index 0000000..5c9681b
--- /dev/null
+++ b/mumd/src/audio/transformers.rs
@@ -0,0 +1,17 @@
+use dasp_ring_buffer::Bounded;
+
+
+pub fn create_noise_gate(chunks: usize, mute_percentage: f32) -> impl FnMut(&mut [f32]) -> Option<&mut [f32]> {
+    let mut peaks = Bounded::from_full(vec![0.0; chunks]);
+    let mut alltime_high: f32 = 0.0;
+    move |buf: &mut [f32]| {
+        let max = buf.iter().map(|e| e.abs()).max_by(|a, b| a.partial_cmp(b).unwrap()).unwrap();
+        peaks.push(max);
+        alltime_high = alltime_high.max(max);
+        if peaks.iter().any(|e| *e >= alltime_high * mute_percentage) {
+            Some(buf)
+        } else {
+            None
+        }
+    }
+}