tor-browser

The Tor Browser
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MediaTrackList.cpp (4848B)

      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 "MediaTrackList.h"
      8 
      9 #include "MediaTrack.h"
     10 #include "mozilla/AsyncEventDispatcher.h"
     11 #include "mozilla/dom/AudioTrack.h"
     12 #include "mozilla/dom/HTMLMediaElement.h"
     13 #include "mozilla/dom/TrackEvent.h"
     14 #include "mozilla/dom/VideoTrack.h"
     15 #include "nsThreadUtils.h"
     16 
     17 namespace mozilla::dom {
     18 
     19 MediaTrackList::MediaTrackList(nsIGlobalObject* aOwnerObject,
     20                               HTMLMediaElement* aMediaElement)
     21    : DOMEventTargetHelper(aOwnerObject), mMediaElement(aMediaElement) {}
     22 
     23 MediaTrackList::~MediaTrackList() = default;
     24 
     25 NS_IMPL_CYCLE_COLLECTION_INHERITED(MediaTrackList, DOMEventTargetHelper,
     26                                   mTracks, mMediaElement)
     27 
     28 NS_IMPL_ADDREF_INHERITED(MediaTrackList, DOMEventTargetHelper)
     29 NS_IMPL_RELEASE_INHERITED(MediaTrackList, DOMEventTargetHelper)
     30 NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(MediaTrackList)
     31 NS_INTERFACE_MAP_END_INHERITING(DOMEventTargetHelper)
     32 
     33 MediaTrack* MediaTrackList::operator[](uint32_t aIndex) {
     34  return mTracks.ElementAt(aIndex);
     35 }
     36 
     37 MediaTrack* MediaTrackList::IndexedGetter(uint32_t aIndex, bool& aFound) {
     38  aFound = aIndex < mTracks.Length();
     39  if (!aFound) {
     40    return nullptr;
     41  }
     42  return mTracks[aIndex];
     43 }
     44 
     45 MediaTrack* MediaTrackList::GetTrackById(const nsAString& aId) {
     46  for (uint32_t i = 0; i < mTracks.Length(); ++i) {
     47    if (aId.Equals(mTracks[i]->GetId())) {
     48      return mTracks[i];
     49    }
     50  }
     51  return nullptr;
     52 }
     53 
     54 void MediaTrackList::AddTrack(MediaTrack* aTrack) {
     55  MOZ_ASSERT(aTrack->GetOwnerGlobal() == GetOwnerGlobal(),
     56             "Where is this track from?");
     57  mTracks.AppendElement(aTrack);
     58  aTrack->SetTrackList(this);
     59  CreateAndDispatchTrackEventRunner(aTrack, u"addtrack"_ns);
     60 
     61  if (HTMLMediaElement* element = GetMediaElement()) {
     62    element->NotifyMediaTrackAdded(aTrack);
     63  }
     64 
     65  if ((!aTrack->AsAudioTrack() || !aTrack->AsAudioTrack()->Enabled()) &&
     66      (!aTrack->AsVideoTrack() || !aTrack->AsVideoTrack()->Selected())) {
     67    // Track not enabled, no need to notify media element.
     68    return;
     69  }
     70 
     71  if (HTMLMediaElement* element = GetMediaElement()) {
     72    element->NotifyMediaTrackEnabled(aTrack);
     73  }
     74 }
     75 
     76 void MediaTrackList::RemoveTrack(const RefPtr<MediaTrack>& aTrack) {
     77  mTracks.RemoveElement(aTrack);
     78  aTrack->SetEnabledInternal(false, MediaTrack::FIRE_NO_EVENTS);
     79  aTrack->SetTrackList(nullptr);
     80  CreateAndDispatchTrackEventRunner(aTrack, u"removetrack"_ns);
     81  if (HTMLMediaElement* element = GetMediaElement()) {
     82    element->NotifyMediaTrackRemoved(aTrack);
     83  }
     84 }
     85 
     86 void MediaTrackList::RemoveTracks() {
     87  while (!mTracks.IsEmpty()) {
     88    RefPtr<MediaTrack> track = mTracks.LastElement();
     89    RemoveTrack(track);
     90  }
     91 }
     92 
     93 already_AddRefed<AudioTrack> MediaTrackList::CreateAudioTrack(
     94    nsIGlobalObject* aOwnerGlobal, const nsAString& aId, const nsAString& aKind,
     95    const nsAString& aLabel, const nsAString& aLanguage, bool aEnabled,
     96    AudioStreamTrack* aAudioTrack) {
     97  RefPtr<AudioTrack> track = new AudioTrack(aOwnerGlobal, aId, aKind, aLabel,
     98                                            aLanguage, aEnabled, aAudioTrack);
     99  return track.forget();
    100 }
    101 
    102 already_AddRefed<VideoTrack> MediaTrackList::CreateVideoTrack(
    103    nsIGlobalObject* aOwnerGlobal, const nsAString& aId, const nsAString& aKind,
    104    const nsAString& aLabel, const nsAString& aLanguage,
    105    VideoStreamTrack* aVideoTrack) {
    106  RefPtr<VideoTrack> track =
    107      new VideoTrack(aOwnerGlobal, aId, aKind, aLabel, aLanguage, aVideoTrack);
    108  return track.forget();
    109 }
    110 
    111 void MediaTrackList::EmptyTracks() {
    112  for (uint32_t i = 0; i < mTracks.Length(); ++i) {
    113    mTracks[i]->SetEnabledInternal(false, MediaTrack::FIRE_NO_EVENTS);
    114    mTracks[i]->SetTrackList(nullptr);
    115  }
    116  mTracks.Clear();
    117 }
    118 
    119 void MediaTrackList::CreateAndDispatchChangeEvent() {
    120  RefPtr<AsyncEventDispatcher> asyncDispatcher =
    121      new AsyncEventDispatcher(this, u"change"_ns, CanBubble::eNo);
    122  asyncDispatcher->PostDOMEvent();
    123 }
    124 
    125 void MediaTrackList::CreateAndDispatchTrackEventRunner(
    126    MediaTrack* aTrack, const nsAString& aEventName) {
    127  TrackEventInit eventInit;
    128 
    129  if (aTrack->AsAudioTrack()) {
    130    eventInit.mTrack.SetValue().SetAsAudioTrack() = aTrack->AsAudioTrack();
    131  } else if (aTrack->AsVideoTrack()) {
    132    eventInit.mTrack.SetValue().SetAsVideoTrack() = aTrack->AsVideoTrack();
    133  }
    134 
    135  RefPtr<TrackEvent> event =
    136      TrackEvent::Constructor(this, aEventName, eventInit);
    137 
    138  RefPtr<AsyncEventDispatcher> asyncDispatcher =
    139      new AsyncEventDispatcher(this, event.forget());
    140  asyncDispatcher->PostDOMEvent();
    141 }
    142 
    143 }  // namespace mozilla::dom