1 files changed, 92 insertions, 0 deletions
diff --git a/dom/media/VideoTrack.cpp b/dom/media/VideoTrack.cpp
new file mode 100644
index 0000000000..57ed306857
--- /dev/null
+++ b/dom/media/VideoTrack.cpp
@@ -0,0 +1,92 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 et tw=78: */
+/* 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 http://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/dom/HTMLMediaElement.h"
+#include "mozilla/dom/VideoStreamTrack.h"
+#include "mozilla/dom/VideoTrack.h"
+#include "mozilla/dom/VideoTrackBinding.h"
+#include "mozilla/dom/VideoTrackList.h"
+
+namespace mozilla::dom {
+
+VideoTrack::VideoTrack(nsIGlobalObject* aOwnerGlobal, const nsAString& aId,
+                       const nsAString& aKind, const nsAString& aLabel,
+                       const nsAString& aLanguage,
+                       VideoStreamTrack* aStreamTrack)
+    : MediaTrack(aOwnerGlobal, aId, aKind, aLabel, aLanguage),
+      mSelected(false),
+      mVideoStreamTrack(aStreamTrack) {}
+
+VideoTrack::~VideoTrack() = default;
+
+NS_IMPL_CYCLE_COLLECTION_INHERITED(VideoTrack, MediaTrack, mVideoStreamTrack)
+
+NS_IMPL_ADDREF_INHERITED(VideoTrack, MediaTrack)
+NS_IMPL_RELEASE_INHERITED(VideoTrack, MediaTrack)
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(VideoTrack)
+NS_INTERFACE_MAP_END_INHERITING(MediaTrack)
+
+JSObject* VideoTrack::WrapObject(JSContext* aCx,
+                                 JS::Handle<JSObject*> aGivenProto) {
+  return VideoTrack_Binding::Wrap(aCx, this, aGivenProto);
+}
+
+void VideoTrack::SetSelected(bool aSelected) {
+  SetEnabledInternal(aSelected, MediaTrack::DEFAULT);
+}
+
+void VideoTrack::SetEnabledInternal(bool aEnabled, int aFlags) {
+  if (aEnabled == mSelected) {
+    return;
+  }
+
+  mSelected = aEnabled;
+
+  // If this VideoTrack is no longer in its original VideoTrackList, then
+  // whether it is selected or not has no effect on its original list.
+  if (!mList) {
+    return;
+  }
+
+  VideoTrackList& list = static_cast<VideoTrackList&>(*mList);
+  if (mSelected) {
+    uint32_t curIndex = 0;
+
+    // Unselect all video tracks except the current one.
+    for (uint32_t i = 0; i < list.Length(); ++i) {
+      if (list[i] == this) {
+        curIndex = i;
+        continue;
+      }
+
+      VideoTrack* track = list[i];
+      track->SetSelected(false);
+    }
+
+    // Set the index of selected video track to the current's index.
+    list.mSelectedIndex = curIndex;
+
+    HTMLMediaElement* element = mList->GetMediaElement();
+    if (element) {
+      element->NotifyMediaTrackEnabled(this);
+    }
+  } else {
+    list.mSelectedIndex = -1;
+
+    HTMLMediaElement* element = mList->GetMediaElement();
+    if (element) {
+      element->NotifyMediaTrackDisabled(this);
+    }
+  }
+
+  // Fire the change event at selection changes on this video track, shall
+  // propose a spec change later.
+  if (!(aFlags & MediaTrack::FIRE_NO_EVENTS)) {
+    list.CreateAndDispatchChangeEvent();
+  }
+}
+
+}  // namespace mozilla::dom