*: refactor setters to return self

src/codec/decoder/audio.rs

@@ -64,16 +64,20 @@ impl Audio {
 		}
 	}
 
-	pub fn set_channel_layout(&mut self, value: ChannelLayout) {
+	pub fn set_channel_layout(&mut self, value: ChannelLayout) -> &mut Self {
 		unsafe {
 			(*self.as_mut_ptr()).channel_layout = value.bits();
 		}
+
+		self
 	}
 
-	pub fn request_channel_layout(&mut self, value: ChannelLayout) {
+	pub fn request_channel_layout(&mut self, value: ChannelLayout) -> &mut Self {
 		unsafe {
 			(*self.as_mut_ptr()).request_channel_layout = value.bits();
 		}
+
+		self
 	}
 
 	pub fn audio_service(&mut self) -> AudioService {