зеркало из https://github.com/mozilla/gecko-dev.git
82 строки
2.7 KiB
C++
82 строки
2.7 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* vim:set ts=2 sw=2 et tw=78: */
|
|
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
#ifndef mozilla_dom_MediaTrack_h
|
|
#define mozilla_dom_MediaTrack_h
|
|
|
|
#include "mozilla/DOMEventTargetHelper.h"
|
|
|
|
namespace mozilla {
|
|
namespace dom {
|
|
|
|
class MediaTrackList;
|
|
class VideoTrack;
|
|
class AudioTrack;
|
|
|
|
/**
|
|
* Base class of AudioTrack and VideoTrack. The AudioTrack and VideoTrack
|
|
* objects represent specific tracks of a media resource. Each track has aspects
|
|
* of an identifier, category, label, and language, even if a track is removed
|
|
* from its corresponding track list, those aspects do not change.
|
|
*
|
|
* When fetching the media resource, an audio/video track is created if the
|
|
* media resource is found to have an audio/video track. When the UA has learned
|
|
* that an audio/video track has ended, this audio/video track will be removed
|
|
* from its corresponding track list.
|
|
*
|
|
* Although AudioTrack and VideoTrack are not EventTargets, TextTrack is, and
|
|
* TextTrack inherits from MediaTrack as well (or is going to).
|
|
*/
|
|
class MediaTrack : public DOMEventTargetHelper {
|
|
public:
|
|
MediaTrack(nsIGlobalObject* aOwnerGlobal, const nsAString& aId,
|
|
const nsAString& aKind, const nsAString& aLabel,
|
|
const nsAString& aLanguage);
|
|
|
|
NS_DECL_ISUPPORTS_INHERITED
|
|
NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(dom::MediaTrack,
|
|
DOMEventTargetHelper)
|
|
|
|
enum {
|
|
DEFAULT = 0,
|
|
FIRE_NO_EVENTS = 1 << 0,
|
|
};
|
|
// The default behavior of enabling an audio track or selecting a video track
|
|
// fires a change event and notifies its media resource about the changes.
|
|
// It should not fire any events when fetching media resource.
|
|
virtual void SetEnabledInternal(bool aEnabled, int aFlags) = 0;
|
|
|
|
virtual AudioTrack* AsAudioTrack() { return nullptr; }
|
|
|
|
virtual VideoTrack* AsVideoTrack() { return nullptr; }
|
|
|
|
const nsString& GetId() const { return mId; }
|
|
|
|
// WebIDL
|
|
void GetId(nsAString& aId) const { aId = mId; }
|
|
void GetKind(nsAString& aKind) const { aKind = mKind; }
|
|
void GetLabel(nsAString& aLabel) const { aLabel = mLabel; }
|
|
void GetLanguage(nsAString& aLanguage) const { aLanguage = mLanguage; }
|
|
|
|
friend class MediaTrackList;
|
|
|
|
protected:
|
|
virtual ~MediaTrack();
|
|
|
|
void SetTrackList(MediaTrackList* aList);
|
|
|
|
RefPtr<MediaTrackList> mList;
|
|
nsString mId;
|
|
nsString mKind;
|
|
nsString mLabel;
|
|
nsString mLanguage;
|
|
};
|
|
|
|
} // namespace dom
|
|
} // namespace mozilla
|
|
|
|
#endif // mozilla_dom_MediaTrack_h
|