avm2: Stub `SoundChannel.position`.

This also comes with an ignored test for `position`, because I originally believed this to be implementable.

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

@@ -49,6 +49,15 @@ pub fn right_peak<'gc>(
     Err("Sound.rightPeak is a stub.".into())
 }
 
+/// Impl `SoundChannel.position`
+pub fn position<'gc>(
+    _activation: &mut Activation<'_, 'gc, '_>,
+    _this: Option<Object<'gc>>,
+    _args: &[Value<'gc>],
+) -> Result<Value<'gc>, Error> {
+    Err("Sound.position is a stub.".into())
+}
+
 /// Construct `SoundChannel`'s class.
 pub fn create_class<'gc>(mc: MutationContext<'gc, '_>) -> GcCell<'gc, Class<'gc>> {
     let class = Class::new(
@@ -71,6 +80,7 @@ pub fn create_class<'gc>(mc: MutationContext<'gc, '_>) -> GcCell<'gc, Class<'gc>
     )] = &[
         ("leftPeak", Some(left_peak), None),
         ("rightPeak", Some(right_peak), None),
+        ("position", Some(position), None),
     ];
     write.define_public_builtin_instance_properties(mc, PUBLIC_INSTANCE_PROPERTIES);
 

tests/tests/regression_tests.rs

@@ -659,6 +659,7 @@ swf_tests! {
     (as3_simplebutton_soundtransform, "avm2/simplebutton_soundtransform", 49),
     (as3_soundmixer_soundtransform, "avm2/soundmixer_soundtransform", 49),
     (as3_sound_play, "avm2/sound_play", 1),
+    #[ignore] (as3_soundchannel_position, "avm2/soundchannel_position", 75),
 }
 
 // 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_position/output.txt

@@ -0,0 +1,136 @@
+Attempting to launch and connect to Player using URL I:\Code\ruffle\tests\tests\swfs\avm2\soundchannel_position\test.swf
+[SWF] I:\Code\ruffle\tests\tests\swfs\avm2\soundchannel_position\test.swf - 31029 bytes after decompression
+///var silence = new Silence();
+///var silence_channel = silence.play();
+///silence_channel.position
+0
+///silence_channel.position
+0
+///silence_channel.position
+23.219954648526077
+///silence_channel.position
+92.87981859410431
+///silence_channel.position
+116.09977324263038
+///silence_channel.position
+162.53968253968253
+///silence_channel.position
+208.9795918367347
+///silence_channel.position
+255.41950113378684
+///silence_channel.position
+278.6394557823129
+///silence_channel.position
+325.07936507936506
+///silence_channel.position
+348.29931972789115
+///silence_channel.position
+394.7392290249433
+///silence_channel.position
+441.1791383219954
+///silence_channel.position
+487.6190476190476
+///silence_channel.position
+534.0589569160998
+///silence_channel.position
+580.4988662131519
+///silence_channel.position
+603.718820861678
+///silence_channel.position
+650.1587301587301
+///silence_channel.position
+673.3786848072563
+///silence_channel.position
+743.0385487528345
+///silence_channel.position
+766.2585034013605
+///silence_channel.position
+812.6984126984127
+///silence_channel.position
+859.1383219954648
+///silence_channel.position
+905.578231292517
+///silence_channel.position
+928.798185941043
+///silence_channel.position
+975.2380952380952
+///silence_channel.position
+1021.6780045351474
+///silence_channel.position
+1044.8979591836735
+///silence_channel.position
+1044.8979591836735
+///silence_channel.position
+1044.8979591836735
+///silence_channel.position
+1044.8979591836735
+///silence_channel.position
+1044.8979591836735
+///silence_channel.position
+1044.8979591836735
+///var lofisilence = new LofiSilence();
+///var lofisilence_channel = lofisilence.play();
+///lofisilence_channel.position
+0
+///lofisilence_channel.position
+69.65986394557822
+///lofisilence_channel.position
+92.87981859410431
+///lofisilence_channel.position
+139.31972789115645
+///lofisilence_channel.position
+185.75963718820861
+///lofisilence_channel.position
+208.9795918367347
+///lofisilence_channel.position
+255.41950113378684
+///lofisilence_channel.position
+301.859410430839
+///lofisilence_channel.position
+348.29931972789115
+///lofisilence_channel.position
+394.7392290249433
+///lofisilence_channel.position
+417.9591836734694
+///lofisilence_channel.position
+464.3990929705215
+///lofisilence_channel.position
+510.8390022675737
+///lofisilence_channel.position
+557.2789115646258
+///lofisilence_channel.position
+580.4988662131519
+///lofisilence_channel.position
+626.9387755102041
+///lofisilence_channel.position
+673.3786848072563
+///lofisilence_channel.position
+719.8185941043083
+///lofisilence_channel.position
+766.2585034013605
+///lofisilence_channel.position
+812.6984126984127
+///lofisilence_channel.position
+835.9183673469388
+///lofisilence_channel.position
+882.3582766439908
+///lofisilence_channel.position
+928.798185941043
+///lofisilence_channel.position
+975.2380952380952
+///lofisilence_channel.position
+998.4580498866213
+///lofisilence_channel.position
+1044.8979591836735
+///lofisilence_channel.position
+1044.8979591836735
+///lofisilence_channel.position
+1044.8979591836735
+///lofisilence_channel.position
+1044.8979591836735
+///lofisilence_channel.position
+1044.8979591836735
+///lofisilence_channel.position
+1044.8979591836735
+///lofisilence_channel.position
+1044.8979591836735