зеркало из https://github.com/mozilla/gecko-dev.git
80 строки
2.6 KiB
C++
80 строки
2.6 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_MediaTrack_h
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#define mozilla_dom_MediaTrack_h
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#include "mozilla/DOMEventTargetHelper.h"
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namespace mozilla::dom {
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class MediaTrackList;
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class VideoTrack;
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class AudioTrack;
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/**
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* Base class of AudioTrack and VideoTrack. The AudioTrack and VideoTrack
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* objects represent specific tracks of a media resource. Each track has aspects
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* of an identifier, category, label, and language, even if a track is removed
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* from its corresponding track list, those aspects do not change.
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*
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* When fetching the media resource, an audio/video track is created if the
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* media resource is found to have an audio/video track. When the UA has learned
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* that an audio/video track has ended, this audio/video track will be removed
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* from its corresponding track list.
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*
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* Although AudioTrack and VideoTrack are not EventTargets, TextTrack is, and
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* TextTrack inherits from MediaTrack as well (or is going to).
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*/
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class MediaTrack : public DOMEventTargetHelper {
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public:
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MediaTrack(nsIGlobalObject* aOwnerGlobal, const nsAString& aId,
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const nsAString& aKind, const nsAString& aLabel,
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const nsAString& aLanguage);
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NS_DECL_ISUPPORTS_INHERITED
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NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(dom::MediaTrack,
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DOMEventTargetHelper)
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enum {
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DEFAULT = 0,
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FIRE_NO_EVENTS = 1 << 0,
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};
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// The default behavior of enabling an audio track or selecting a video track
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// fires a change event and notifies its media resource about the changes.
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// It should not fire any events when fetching media resource.
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virtual void SetEnabledInternal(bool aEnabled, int aFlags) = 0;
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virtual AudioTrack* AsAudioTrack() { return nullptr; }
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virtual VideoTrack* AsVideoTrack() { return nullptr; }
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const nsString& GetId() const { return mId; }
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// WebIDL
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void GetId(nsAString& aId) const { aId = mId; }
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void GetKind(nsAString& aKind) const { aKind = mKind; }
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void GetLabel(nsAString& aLabel) const { aLabel = mLabel; }
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void GetLanguage(nsAString& aLanguage) const { aLanguage = mLanguage; }
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friend class MediaTrackList;
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protected:
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virtual ~MediaTrack();
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void SetTrackList(MediaTrackList* aList);
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RefPtr<MediaTrackList> mList;
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nsString mId;
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nsString mKind;
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nsString mLabel;
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nsString mLanguage;
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};
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} // namespace mozilla::dom
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#endif // mozilla_dom_MediaTrack_h
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