tor-browser

The Tor Browser
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VideoTrack.cpp (2865B)

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