Add MediaStream.getTrackById()

components/script/dom/mediastream.rs

@@ -6,6 +6,7 @@ use crate::dom::bindings::cell::DomRefCell;
 use crate::dom::bindings::codegen::Bindings::MediaStreamBinding::{self, MediaStreamMethods};
 use crate::dom::bindings::reflector::reflect_dom_object;
 use crate::dom::bindings::root::{Dom, DomRoot};
+use crate::dom::bindings::str::DOMString;
 use crate::dom::eventtarget::EventTarget;
 use crate::dom::globalscope::GlobalScope;
 use crate::dom::mediastreamtrack::MediaStreamTrack;
@@ -73,4 +74,13 @@ impl MediaStreamMethods for MediaStream {
             .map(|x| DomRoot::from_ref(&**x))
             .collect()
     }
+
+    /// https://w3c.github.io/mediacapture-main/#dom-mediastream-gettrackbyid
+    fn GetTrackById(&self, id: DOMString) -> Option<DomRoot<MediaStreamTrack>> {
+        self.tracks
+            .borrow()
+            .iter()
+            .find(|x| x.id().id().to_string() == &*id)
+            .map(|x| DomRoot::from_ref(&**x))
+    }
 }

components/script/dom/webidls/MediaStream.webidl

@@ -14,7 +14,7 @@ interface MediaStream : EventTarget {
     sequence<MediaStreamTrack> getAudioTracks();
     sequence<MediaStreamTrack> getVideoTracks();
     sequence<MediaStreamTrack> getTracks();
-    // MediaStreamTrack? getTrackById(DOMString trackId);
+    MediaStreamTrack? getTrackById(DOMString trackId);
     // void addTrack(MediaStreamTrack track);
     // void removeTrack(MediaStreamTrack track);
     // MediaStream clone();