added compositing implementation for rust

Author: readrawhex

rust/dithertools-core/src/audio.rs

@@ -213,11 +213,7 @@ fn load_with_symphonia(path: &Path) -> Result<AudioTrack> {
     let mut planar: Vec<Vec<f32>> = vec![Vec::new(); n_channels];
     let mut sample_buf: Option<SampleBuffer<f32>> = None;
 
-    loop {
-        let packet = match fmt.next_packet() {
-            Ok(p) => p,
-            Err(_) => break,
-        };
+    while let Ok(packet) = fmt.next_packet() {
         if packet.track_id() != track_id {
             continue;
         }