dom/media/VideoTrack.cpp

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim:set ts=2 sw=2 et tw=78: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include "mozilla/dom/HTMLMediaElement.h"
   8 #include "mozilla/dom/VideoStreamTrack.h"
   9 #include "mozilla/dom/VideoTrack.h"
  10 #include "mozilla/dom/VideoTrackBinding.h"
  11 #include "mozilla/dom/VideoTrackList.h"
  12
  13 namespace mozilla::dom {
  14
  15 VideoTrack::VideoTrack(nsIGlobalObject* aOwnerGlobal, const nsAString& aId,
  16                        const nsAString& aKind, const nsAString& aLabel,
  17                        const nsAString& aLanguage,
  18                        VideoStreamTrack* aStreamTrack)
  19     : MediaTrack(aOwnerGlobal, aId, aKind, aLabel, aLanguage),
  20       mSelected(false),
  21       mVideoStreamTrack(aStreamTrack) {}
  22
  23 VideoTrack::~VideoTrack() = default;
  24
  25 NS_IMPL_CYCLE_COLLECTION_INHERITED(VideoTrack, MediaTrack, mVideoStreamTrack)
  26
  27 NS_IMPL_ADDREF_INHERITED(VideoTrack, MediaTrack)
  28 NS_IMPL_RELEASE_INHERITED(VideoTrack, MediaTrack)
  29 NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(VideoTrack)
  30 NS_INTERFACE_MAP_END_INHERITING(MediaTrack)
  31
  32 JSObject* VideoTrack::WrapObject(JSContext* aCx,
  33                                  JS::Handle<JSObject*> aGivenProto) {
  34   return VideoTrack_Binding::Wrap(aCx, this, aGivenProto);
  35 }
  36
  37 void VideoTrack::SetSelected(bool aSelected) {
  38   SetEnabledInternal(aSelected, MediaTrack::DEFAULT);
  39 }
  40
  41 void VideoTrack::SetEnabledInternal(bool aEnabled, int aFlags) {
  42   if (aEnabled == mSelected) {
  43     return;
  44   }
  45
  46   mSelected = aEnabled;
  47
  48   // If this VideoTrack is no longer in its original VideoTrackList, then
  49   // whether it is selected or not has no effect on its original list.
  50   if (!mList) {
  51     return;
  52   }
  53
  54   VideoTrackList& list = static_cast<VideoTrackList&>(*mList);
  55   if (mSelected) {
  56     uint32_t curIndex = 0;
  57
  58     // Unselect all video tracks except the current one.
  59     for (uint32_t i = 0; i < list.Length(); ++i) {
  60       if (list[i] == this) {
  61         curIndex = i;
  62         continue;
  63       }
  64
  65       VideoTrack* track = list[i];
  66       track->SetSelected(false);
  67     }
  68
  69     // Set the index of selected video track to the current's index.
  70     list.mSelectedIndex = curIndex;
  71
  72     HTMLMediaElement* element = mList->GetMediaElement();
  73     if (element) {
  74       element->NotifyMediaTrackEnabled(this);
  75     }
  76   } else {
  77     list.mSelectedIndex = -1;
  78
  79     HTMLMediaElement* element = mList->GetMediaElement();
  80     if (element) {
  81       element->NotifyMediaTrackDisabled(this);
  82     }
  83   }
  84
  85   // Fire the change event at selection changes on this video track, shall
  86   // propose a spec change later.
  87   if (!(aFlags & MediaTrack::FIRE_NO_EVENTS)) {
  88     list.CreateAndDispatchChangeEvent();
  89   }
  90 }
  91
  92 }  // namespace mozilla::dom