зеркало из https://github.com/mozilla/gecko-dev.git
120 строки
3.4 KiB
C++
120 строки
3.4 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim:set ts=2 sw=2 et tw=78: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_dom_MediaTrackList_h
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#define mozilla_dom_MediaTrackList_h
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#include "mozilla/DOMEventTargetHelper.h"
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namespace mozilla {
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class DOMMediaStream;
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namespace dom {
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class HTMLMediaElement;
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class MediaTrack;
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class AudioTrackList;
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class VideoTrackList;
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class AudioTrack;
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class VideoTrack;
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class VideoStreamTrack;
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/**
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* Base class of AudioTrackList and VideoTrackList. The AudioTrackList and
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* VideoTrackList objects represent a dynamic list of zero or more audio and
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* video tracks respectively.
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*
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* When a media element is to forget its media-resource-specific tracks, its
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* audio track list and video track list will be emptied.
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*/
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class MediaTrackList : public DOMEventTargetHelper
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{
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public:
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MediaTrackList(nsPIDOMWindowInner* aOwnerWindow, HTMLMediaElement* aMediaElement);
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NS_DECL_ISUPPORTS_INHERITED
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NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(MediaTrackList, DOMEventTargetHelper)
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using DOMEventTargetHelper::DispatchTrustedEvent;
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// The return value is non-null, assert an error if aIndex is out of bound
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// for array mTracks.
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MediaTrack* operator[](uint32_t aIndex);
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// The track must be from the same Window as this MediaTrackList.
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void AddTrack(MediaTrack* aTrack);
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// In remove track case, the VideoTrackList::mSelectedIndex should be updated
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// due to mTracks changed. No need to take care this in add track case.
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virtual void RemoveTrack(const RefPtr<MediaTrack>& aTrack);
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void RemoveTracks();
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static already_AddRefed<AudioTrack>
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CreateAudioTrack(nsIGlobalObject* aOwnerGlobal,
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const nsAString& aId,
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const nsAString& aKind,
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const nsAString& aLabel,
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const nsAString& aLanguage,
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bool aEnabled);
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// For the case of src of HTMLMediaElement is non-MediaStream, leave the
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// aVideoTrack as default(nullptr).
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static already_AddRefed<VideoTrack>
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CreateVideoTrack(nsIGlobalObject* aOwnerGlobal,
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const nsAString& aId,
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const nsAString& aKind,
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const nsAString& aLabel,
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const nsAString& aLanguage,
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VideoStreamTrack* aVideoTrack = nullptr);
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virtual void EmptyTracks();
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void CreateAndDispatchChangeEvent();
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// WebIDL
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MediaTrack* IndexedGetter(uint32_t aIndex, bool& aFound);
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MediaTrack* GetTrackById(const nsAString& aId);
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bool IsEmpty() const
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{
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return mTracks.IsEmpty();
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}
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uint32_t Length() const
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{
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return mTracks.Length();
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}
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IMPL_EVENT_HANDLER(change)
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IMPL_EVENT_HANDLER(addtrack)
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IMPL_EVENT_HANDLER(removetrack)
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friend class AudioTrack;
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friend class VideoTrack;
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protected:
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virtual ~MediaTrackList();
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void CreateAndDispatchTrackEventRunner(MediaTrack* aTrack,
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const nsAString& aEventName);
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virtual AudioTrackList* AsAudioTrackList() { return nullptr; }
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virtual VideoTrackList* AsVideoTrackList() { return nullptr; }
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HTMLMediaElement* GetMediaElement() { return mMediaElement; }
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nsTArray<RefPtr<MediaTrack>> mTracks;
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RefPtr<HTMLMediaElement> mMediaElement;
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};
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} // namespace dom
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} // namespace mozilla
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#endif // mozilla_dom_MediaTrackList_h
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