MediaElementAudioSourceNode implementation

components/script/dom/audiocontext.rs

@@ -97,6 +97,10 @@ impl AudioContext {
             self.context.resume();
         }
     }
+
+    pub fn base(&self) -> DomRoot<BaseAudioContext> {
+        DomRoot::from_ref(&self.context)
+    }
 }
 
 impl AudioContextMethods for AudioContext {

components/script/dom/mediaelementaudiosourcenode.rs

@@ -0,0 +1,81 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+use crate::dom::audiocontext::AudioContext;
+use crate::dom::audionode::AudioNode;
+use crate::dom::bindings::codegen::Bindings::MediaElementAudioSourceNodeBinding;
+use crate::dom::bindings::codegen::Bindings::MediaElementAudioSourceNodeBinding::MediaElementAudioSourceNodeMethods;
+use crate::dom::bindings::codegen::Bindings::MediaElementAudioSourceNodeBinding::MediaElementAudioSourceOptions;
+use crate::dom::bindings::error::Fallible;
+use crate::dom::bindings::reflector::reflect_dom_object;
+use crate::dom::bindings::root::{Dom, DomRoot};
+use crate::dom::htmlmediaelement::HTMLMediaElement;
+use crate::dom::window::Window;
+use dom_struct::dom_struct;
+use servo_media::audio::media_element_source_node::MediaElementSourceNodeMessage;
+use servo_media::audio::node::{AudioNodeInit, AudioNodeMessage};
+use std::sync::mpsc;
+
+#[dom_struct]
+pub struct MediaElementAudioSourceNode {
+    node: AudioNode,
+    media_element: Dom<HTMLMediaElement>,
+}
+
+impl MediaElementAudioSourceNode {
+    #[allow(unrooted_must_root)]
+    fn new_inherited(
+        window: &Window,
+        context: &AudioContext,
+        options: &MediaElementAudioSourceOptions,
+    ) -> Fallible<MediaElementAudioSourceNode> {
+        let node = AudioNode::new_inherited(
+            AudioNodeInit::MediaElementSourceNode,
+            &*context.base(),
+            Default::default(),
+            0,
+            1,
+        )?;
+        let (sender, receiver) = mpsc::channel();
+        node.message(AudioNodeMessage::MediaElementSourceNode(
+            MediaElementSourceNodeMessage::GetAudioRenderer(sender),
+        ));
+        let audio_renderer = receiver.recv().unwrap();
+        // XXX set audio renderer in player.
+        let media_element = &options.mediaElement;
+        let media_element = Dom::from_ref(&**media_element);
+        Ok(MediaElementAudioSourceNode {
+            node,
+            media_element,
+        })
+    }
+
+    #[allow(unrooted_must_root)]
+    pub fn new(
+        window: &Window,
+        context: &AudioContext,
+        options: &MediaElementAudioSourceOptions,
+    ) -> Fallible<DomRoot<MediaElementAudioSourceNode>> {
+        let node = MediaElementAudioSourceNode::new_inherited(window, context, options)?;
+        Ok(reflect_dom_object(
+            Box::new(node),
+            window,
+            MediaElementAudioSourceNodeBinding::Wrap,
+        ))
+    }
+
+    pub fn Constructor(
+        window: &Window,
+        context: &AudioContext,
+        options: &MediaElementAudioSourceOptions,
+    ) -> Fallible<DomRoot<MediaElementAudioSourceNode>> {
+        MediaElementAudioSourceNode::new(window, context, options)
+    }
+}
+
+impl MediaElementAudioSourceNodeMethods for MediaElementAudioSourceNode {
+    fn MediaElement(&self) -> DomRoot<HTMLMediaElement> {
+        DomRoot::from_ref(&*self.media_element)
+    }
+}

components/script/dom/mod.rs

@@ -394,6 +394,7 @@ pub mod inputevent;
 pub mod keyboardevent;
 pub mod location;
 pub mod mediadevices;
+pub mod mediaelementaudiosourcenode;
 pub mod mediaerror;
 pub mod mediafragmentparser;
 pub mod medialist;

components/script/dom/webidls/MediaElementAudioSourceNode.webidl

@@ -0,0 +1,17 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+/*
+ * The origin of this IDL file is
+ * https://webaudio.github.io/web-audio-api/#mediaelementaudiosourcenode
+ */
+
+dictionary MediaElementAudioSourceOptions {
+  required HTMLMediaElement mediaElement;
+};
+
+[Exposed=Window]
+interface MediaElementAudioSourceNode : AudioNode {
+  [Throws] constructor (AudioContext context, MediaElementAudioSourceOptions options);
+  [SameObject] readonly attribute HTMLMediaElement mediaElement;
+};