Implement AudioContext.createMediaElementAudioSourceNode()

3 files changed, 20 insertions, 7 deletions

diff --git a/components/script/dom/audiocontext.rs b/components/script/dom/audiocontext.rs
index 033ac49ed11..0212cb78ffa 100644
--- a/components/script/dom/audiocontext.rs
+++ b/components/script/dom/audiocontext.rs
@@ -20,6 +20,8 @@ use crate::dom::bindings::num::Finite;
 use crate::dom::bindings::refcounted::{Trusted, TrustedPromise};
 use crate::dom::bindings::reflector::{reflect_dom_object, DomObject};
 use crate::dom::bindings::root::DomRoot;
+use crate::dom::htmlmediaelement::HTMLMediaElement;
+use crate::dom::mediaelementaudiosourcenode::MediaElementAudioSourceNode;
 use crate::dom::promise::Promise;
 use crate::dom::window::Window;
 use crate::task_source::TaskSource;
@@ -244,6 +246,16 @@ impl AudioContextMethods for AudioContext {
         // Step 6.
         promise
     }
+
+    /// https://webaudio.github.io/web-audio-api/#dom-audiocontext-createmediaelementsource
+    fn CreateMediaElementSource(
+        &self,
+        media_element: &HTMLMediaElement,
+    ) -> Fallible<DomRoot<MediaElementAudioSourceNode>> {
+        let global = self.global();
+        let window = global.as_window();
+        MediaElementAudioSourceNode::new(window, self, media_element)
+    }
 }
 
 impl From<AudioContextLatencyCategory> for LatencyCategory {
diff --git a/components/script/dom/mediaelementaudiosourcenode.rs b/components/script/dom/mediaelementaudiosourcenode.rs
index 312857569e6..07ca70bd80e 100644
--- a/components/script/dom/mediaelementaudiosourcenode.rs
+++ b/components/script/dom/mediaelementaudiosourcenode.rs
@@ -27,7 +27,7 @@ impl MediaElementAudioSourceNode {
     #[allow(unrooted_must_root)]
     fn new_inherited(
         context: &AudioContext,
-        options: &MediaElementAudioSourceOptions,
+        media_element: &HTMLMediaElement,
     ) -> Fallible<MediaElementAudioSourceNode> {
         let node = AudioNode::new_inherited(
             AudioNodeInit::MediaElementSourceNode,
@@ -41,8 +41,8 @@ impl MediaElementAudioSourceNode {
             MediaElementSourceNodeMessage::GetAudioRenderer(sender),
         ));
         let audio_renderer = receiver.recv().unwrap();
-        options.mediaElement.set_audio_renderer(audio_renderer);
-        let media_element = Dom::from_ref(&*options.mediaElement);
+        media_element.set_audio_renderer(audio_renderer);
+        let media_element = Dom::from_ref(media_element);
         Ok(MediaElementAudioSourceNode {
             node,
             media_element,
@@ -53,9 +53,9 @@ impl MediaElementAudioSourceNode {
     pub fn new(
         window: &Window,
         context: &AudioContext,
-        options: &MediaElementAudioSourceOptions,
+        media_element: &HTMLMediaElement,
     ) -> Fallible<DomRoot<MediaElementAudioSourceNode>> {
-        let node = MediaElementAudioSourceNode::new_inherited(context, options)?;
+        let node = MediaElementAudioSourceNode::new_inherited(context, media_element)?;
         Ok(reflect_dom_object(
             Box::new(node),
             window,
@@ -68,11 +68,12 @@ impl MediaElementAudioSourceNode {
         context: &AudioContext,
         options: &MediaElementAudioSourceOptions,
     ) -> Fallible<DomRoot<MediaElementAudioSourceNode>> {
-        MediaElementAudioSourceNode::new(window, context, options)
+        MediaElementAudioSourceNode::new(window, context, &*options.mediaElement)
     }
 }
 
 impl MediaElementAudioSourceNodeMethods for MediaElementAudioSourceNode {
+    /// https://webaudio.github.io/web-audio-api/#dom-mediaelementaudiosourcenode-mediaelement
     fn MediaElement(&self) -> DomRoot<HTMLMediaElement> {
         DomRoot::from_ref(&*self.media_element)
     }
diff --git a/components/script/dom/webidls/AudioContext.webidl b/components/script/dom/webidls/AudioContext.webidl
index 9e5dd6bd556..cd9e18edfa0 100644
--- a/components/script/dom/webidls/AudioContext.webidl
+++ b/components/script/dom/webidls/AudioContext.webidl
@@ -33,7 +33,7 @@ interface AudioContext : BaseAudioContext {
   Promise<void> suspend();
   Promise<void> close();
 
-  // MediaElementAudioSourceNode createMediaElementSource(HTMLMediaElement mediaElement);
+  [Throws] MediaElementAudioSourceNode createMediaElementSource(HTMLMediaElement mediaElement);
   // MediaStreamAudioSourceNode createMediaStreamSource(MediaStream mediaStream);
   // MediaStreamTrackAudioSourceNode createMediaStreamTrackSource(MediaStreamTrack mediaStreamTrack);
   // MediaStreamAudioDestinationNode createMediaStreamDestination();