avm2: Impl `SoundChannel.stop()`

core/src/avm2/globals/flash/media/soundchannel.rs

@@ -98,6 +98,19 @@ pub fn set_sound_transform<'gc>(
     Ok(Value::Undefined)
 }
 
+/// Impl `SoundChannel.stop`
+pub fn stop<'gc>(
+    activation: &mut Activation<'_, 'gc, '_>,
+    this: Option<Object<'gc>>,
+    _args: &[Value<'gc>],
+) -> Result<Value<'gc>, Error> {
+    if let Some(instance) = this.and_then(|this| this.as_sound_instance()) {
+        activation.context.stop_sound(instance);
+    }
+
+    Ok(Value::Undefined)
+}
+
 /// Construct `SoundChannel`'s class.
 pub fn create_class<'gc>(mc: MutationContext<'gc, '_>) -> GcCell<'gc, Class<'gc>> {
     let class = Class::new(
@@ -129,5 +142,8 @@ pub fn create_class<'gc>(mc: MutationContext<'gc, '_>) -> GcCell<'gc, Class<'gc>
     ];
     write.define_public_builtin_instance_properties(mc, PUBLIC_INSTANCE_PROPERTIES);
 
+    const PUBLIC_INSTANCE_METHODS: &[(&str, NativeMethodImpl)] = &[("stop", stop)];
+    write.define_public_builtin_instance_methods(mc, PUBLIC_INSTANCE_METHODS);
+
     class
 }

tests/tests/regression_tests.rs

@@ -661,6 +661,7 @@ swf_tests! {
     (as3_sound_play, "avm2/sound_play", 1),
     #[ignore] (as3_soundchannel_position, "avm2/soundchannel_position", 75),
     (as3_soundchannel_soundtransform, "avm2/soundchannel_soundtransform", 49),
+    (as3_soundchannel_stop, "avm2/soundchannel_stop", 4),
 }
 
 // TODO: These tests have some inaccuracies currently, so we use approx_eq to test that numeric values are close enough.

tests/tests/swfs/avm2/soundchannel_stop/output.txt

@@ -0,0 +1,8 @@
+///var silence = new Silence();
+///var silence_channel = silence.play();
+///silence_channel.stop()
+undefined
+///var noise = new Noise();
+///var noise_channel = noise.play(0, 1);
+///noise_channel.stop();
+undefined