add more doc around Empty

Author: DivineGod

examples/channel_volume.rs

@@ -1,14 +1,10 @@
-use std::io::BufReader;
-
 use rodio::source::ChannelVolume;
 
 fn main() {
     let (_stream, handle) = rodio::OutputStream::try_default().unwrap();
     let sink = rodio::Sink::try_new(&handle).unwrap();
 
-    let file = std::fs::File::open("assets/music.ogg").unwrap();
-    let input = rodio::Decoder::new(BufReader::new(file)).unwrap();
-    // let input = rodio::source::SineWave::new(440.0);
+    let input = rodio::source::SineWave::new(440.0);
     let chan_vol = ChannelVolume::new(input, vec![0.01, 0.01, 0.0, 0.0, 0.0, 0.0]);
     sink.append(chan_vol);
 

src/source/empty.rs

@@ -4,6 +4,9 @@ use std::time::Duration;
 use crate::{Sample, Source};
 
 /// An empty source.
+///
+/// The empty source is special in that it will never return any data.
+/// It also reports 0 channels, a sample rate of 0, and a Duration of 0.
 #[derive(Debug, Copy, Clone)]
 pub struct Empty<S>(PhantomData<S>);
 

src/stream.rs

@@ -216,8 +216,7 @@ impl CpalDeviceExt for cpal::Device {
                 &format.config(),
                 move |data, _| {
                     data.iter_mut()
-                        .for_each(|d| *d = mixer_rx.next().unwrap_or(0f32));
-                    dbg!(&data[0..6]);
+                        .for_each(|d| *d = mixer_rx.next().unwrap_or(0f32))
                 },
                 error_callback,
                 None,