tor-browser

The Tor Browser
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VideoTrackList.cpp (2797B)

      1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
      2 /* This Source Code Form is subject to the terms of the Mozilla Public
      3 * License, v. 2.0. If a copy of the MPL was not distributed with this
      4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
      5 
      6 #include "mozilla/dom/VideoTrackList.h"
      7 
      8 #include "mozilla/dom/VideoTrack.h"
      9 #include "mozilla/dom/VideoTrackListBinding.h"
     10 
     11 namespace mozilla::dom {
     12 
     13 JSObject* VideoTrackList::WrapObject(JSContext* aCx,
     14                                     JS::Handle<JSObject*> aGivenProto) {
     15  return VideoTrackList_Binding::Wrap(aCx, this, aGivenProto);
     16 }
     17 
     18 VideoTrack* VideoTrackList::operator[](uint32_t aIndex) {
     19  MediaTrack* track = MediaTrackList::operator[](aIndex);
     20  return track->AsVideoTrack();
     21 }
     22 
     23 void VideoTrackList::RemoveTrack(const RefPtr<MediaTrack>& aTrack) {
     24  // we need to find the video track before |MediaTrackList::RemoveTrack|. Or
     25  // mSelectedIndex will not be valid. The check of mSelectedIndex == -1
     26  // need to be done after RemoveTrack. Also the call of
     27  // |MediaTrackList::RemoveTrack| is necessary even when mSelectedIndex = -1.
     28  bool found;
     29  VideoTrack* selectedVideoTrack = IndexedGetter(mSelectedIndex, found);
     30  MediaTrackList::RemoveTrack(aTrack);
     31  if (mSelectedIndex == -1) {
     32    // There was no selected track and we don't select another track on removal.
     33    return;
     34  }
     35  MOZ_ASSERT(found, "When mSelectedIndex is set it should point to a track");
     36  MOZ_ASSERT(selectedVideoTrack,
     37             "The mSelectedIndex should be set to video track only");
     38 
     39  // Let the caller of RemoveTrack deal with choosing the new selected track if
     40  // it removes the currently-selected track.
     41  if (aTrack == selectedVideoTrack) {
     42    mSelectedIndex = -1;
     43    return;
     44  }
     45 
     46  // The removed track was not the selected track and there is a
     47  // currently-selected video track. We need to find the new location of the
     48  // selected track.
     49  for (size_t ix = 0; ix < mTracks.Length(); ix++) {
     50    if (mTracks[ix] == selectedVideoTrack) {
     51      mSelectedIndex = ix;
     52      return;
     53    }
     54  }
     55 }
     56 
     57 void VideoTrackList::EmptyTracks() {
     58  mSelectedIndex = -1;
     59  MediaTrackList::EmptyTracks();
     60 }
     61 
     62 VideoTrack* VideoTrackList::GetSelectedTrack() {
     63  if (mSelectedIndex < 0 ||
     64      static_cast<size_t>(mSelectedIndex) >= mTracks.Length()) {
     65    return nullptr;
     66  }
     67 
     68  return operator[](mSelectedIndex);
     69 }
     70 
     71 VideoTrack* VideoTrackList::IndexedGetter(uint32_t aIndex, bool& aFound) {
     72  MediaTrack* track = MediaTrackList::IndexedGetter(aIndex, aFound);
     73  return track ? track->AsVideoTrack() : nullptr;
     74 }
     75 
     76 VideoTrack* VideoTrackList::GetTrackById(const nsAString& aId) {
     77  MediaTrack* track = MediaTrackList::GetTrackById(aId);
     78  return track ? track->AsVideoTrack() : nullptr;
     79 }
     80 
     81 }  // namespace mozilla::dom