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fune/dom/html/HTMLMediaElement.h

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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_HTMLMediaElement_h
#define mozilla_dom_HTMLMediaElement_h
#include "nsGenericHTMLElement.h"
#include "AudioChannelService.h"
#include "MediaEventSource.h"
#include "SeekTarget.h"
#include "MediaDecoderOwner.h"
#include "MediaElementEventRunners.h"
#include "MediaPlaybackDelayPolicy.h"
#include "MediaPromiseDefs.h"
#include "TelemetryProbesReporter.h"
#include "nsCycleCollectionParticipant.h"
#include "Visibility.h"
#include "mozilla/CORSMode.h"
#include "DecoderTraits.h"
#include "mozilla/Attributes.h"
#include "mozilla/StateWatching.h"
#include "mozilla/WeakPtr.h"
#include "mozilla/dom/DecoderDoctorNotificationBinding.h"
#include "mozilla/dom/HTMLMediaElementBinding.h"
#include "mozilla/dom/MediaDebugInfoBinding.h"
#include "mozilla/dom/MediaKeys.h"
#include "mozilla/dom/TextTrackManager.h"
#include "nsGkAtoms.h"
#include "PrincipalChangeObserver.h"
#include "nsStubMutationObserver.h"
#include "MediaSegment.h" // for PrincipalHandle, GraphTime
#include <utility>
// X.h on Linux #defines CurrentTime as 0L, so we have to #undef it here.
#ifdef CurrentTime
# undef CurrentTime
#endif
// Define to output information on decoding and painting framerate
/* #define DEBUG_FRAME_RATE 1 */
typedef uint16_t nsMediaNetworkState;
typedef uint16_t nsMediaReadyState;
typedef uint32_t SuspendTypes;
typedef uint32_t AudibleChangedReasons;
class nsIStreamListener;
namespace mozilla {
class AbstractThread;
class ChannelMediaDecoder;
class DecoderDoctorDiagnostics;
class DOMMediaStream;
class ErrorResult;
class FirstFrameVideoOutput;
class MediaResource;
class MediaDecoder;
class MediaInputPort;
class MediaTrack;
class MediaTrackGraph;
class MediaStreamWindowCapturer;
struct SharedDummyTrack;
class VideoFrameContainer;
class VideoOutput;
namespace dom {
class MediaKeys;
class TextTrack;
class TimeRanges;
class WakeLock;
class MediaStreamTrack;
class MediaStreamTrackSource;
class MediaTrack;
class VideoStreamTrack;
} // namespace dom
} // namespace mozilla
class AudioDeviceInfo;
class nsIChannel;
class nsIHttpChannel;
class nsILoadGroup;
class nsIRunnable;
class nsISerialEventTarget;
class nsITimer;
class nsRange;
namespace mozilla {
namespace dom {
// Number of milliseconds between timeupdate events as defined by spec
#define TIMEUPDATE_MS 250
class MediaError;
class MediaSource;
class PlayPromise;
class Promise;
class TextTrackList;
class AudioTrackList;
class VideoTrackList;
enum class StreamCaptureType : uint8_t { CAPTURE_ALL_TRACKS, CAPTURE_AUDIO };
enum class StreamCaptureBehavior : uint8_t {
CONTINUE_WHEN_ENDED,
FINISH_WHEN_ENDED
};
class HTMLMediaElement : public nsGenericHTMLElement,
public MediaDecoderOwner,
public PrincipalChangeObserver<MediaStreamTrack>,
public SupportsWeakPtr,
public nsStubMutationObserver,
public TelemetryProbesReporterOwner {
public:
typedef mozilla::TimeStamp TimeStamp;
typedef mozilla::layers::ImageContainer ImageContainer;
typedef mozilla::VideoFrameContainer VideoFrameContainer;
typedef mozilla::MediaResource MediaResource;
typedef mozilla::MediaDecoderOwner MediaDecoderOwner;
typedef mozilla::MetadataTags MetadataTags;
// Helper struct to keep track of the MediaStreams returned by
// mozCaptureStream(). For each OutputMediaStream, dom::MediaTracks get
// captured into MediaStreamTracks which get added to
// OutputMediaStream::mStream.
struct OutputMediaStream {
OutputMediaStream(RefPtr<DOMMediaStream> aStream, bool aCapturingAudioOnly,
bool aFinishWhenEnded);
~OutputMediaStream();
RefPtr<DOMMediaStream> mStream;
nsTArray<RefPtr<MediaStreamTrack>> mLiveTracks;
const bool mCapturingAudioOnly;
const bool mFinishWhenEnded;
// If mFinishWhenEnded is true, this is the URI of the first resource
// mStream got tracks for, if not a MediaStream.
nsCOMPtr<nsIURI> mFinishWhenEndedLoadingSrc;
// If mFinishWhenEnded is true, this is the first MediaStream mStream got
// tracks for, if not a resource.
RefPtr<DOMMediaStream> mFinishWhenEndedAttrStream;
};
NS_DECL_NSIMUTATIONOBSERVER_CONTENTREMOVED
CORSMode GetCORSMode() { return mCORSMode; }
explicit HTMLMediaElement(
already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo);
void Init();
// `eMandatory`: `timeupdate` occurs according to the spec requirement.
// Eg.
// https://html.spec.whatwg.org/multipage/media.html#seeking:event-media-timeupdate
// `ePeriodic` : `timeupdate` occurs regularly and should follow the rule
// of not dispatching that event within 250 ms. Eg.
// https://html.spec.whatwg.org/multipage/media.html#offsets-into-the-media-resource:event-media-timeupdate
enum class TimeupdateType : bool {
eMandatory = false,
ePeriodic = true,
};
// This is used for event runner creation. Currently only timeupdate needs
// that, but it can be used to extend for other events in the future if
// necessary.
enum class EventFlag : uint8_t {
eNone = 0,
eMandatory = 1,
};
/**
* This is used when the browser is constructing a video element to play
* a channel that we've already started loading. The src attribute and
* <source> children are ignored.
* @param aChannel the channel to use
* @param aListener returns a stream listener that should receive
* notifications for the stream
*/
nsresult LoadWithChannel(nsIChannel* aChannel, nsIStreamListener** aListener);
// nsISupports
NS_DECL_ISUPPORTS_INHERITED
NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(HTMLMediaElement,
nsGenericHTMLElement)
NS_IMPL_FROMNODE_HELPER(HTMLMediaElement,
IsAnyOfHTMLElements(nsGkAtoms::video,
nsGkAtoms::audio))
NS_DECL_ADDSIZEOFEXCLUDINGTHIS
// EventTarget
void GetEventTargetParent(EventChainPreVisitor& aVisitor) override;
virtual bool ParseAttribute(int32_t aNamespaceID, nsAtom* aAttribute,
const nsAString& aValue,
nsIPrincipal* aMaybeScriptedPrincipal,
nsAttrValue& aResult) override;
virtual nsresult BindToTree(BindContext&, nsINode& aParent) override;
virtual void UnbindFromTree(bool aNullParent = true) override;
virtual void DoneCreatingElement() override;
virtual bool IsHTMLFocusable(bool aWithMouse, bool* aIsFocusable,
int32_t* aTabIndex) override;
virtual int32_t TabIndexDefault() override;
// Called by the video decoder object, on the main thread,
// when it has read the metadata containing video dimensions,
// etc.
virtual void MetadataLoaded(const MediaInfo* aInfo,
UniquePtr<const MetadataTags> aTags) final;
// Called by the decoder object, on the main thread,
// when it has read the first frame of the video or audio.
void FirstFrameLoaded() final;
// Called by the video decoder object, on the main thread,
// when the resource has a network error during loading.
void NetworkError(const MediaResult& aError) final;
// Called by the video decoder object, on the main thread, when the
// resource has a decode error during metadata loading or decoding.
void DecodeError(const MediaResult& aError) final;
// Called by the decoder object, on the main thread, when the
// resource has a decode issue during metadata loading or decoding, but can
// continue decoding.
void DecodeWarning(const MediaResult& aError) final;
// Return true if error attribute is not null.
bool HasError() const final;
// Called by the video decoder object, on the main thread, when the
// resource load has been cancelled.
void LoadAborted() final;
// Called by the video decoder object, on the main thread,
// when the video playback has ended.
void PlaybackEnded() final;
// Called by the video decoder object, on the main thread,
// when the resource has started seeking.
void SeekStarted() final;
// Called by the video decoder object, on the main thread,
// when the resource has completed seeking.
void SeekCompleted() final;
// Called by the video decoder object, on the main thread,
// when the resource has aborted seeking.
void SeekAborted() final;
// Called by the media stream, on the main thread, when the download
// has been suspended by the cache or because the element itself
// asked the decoder to suspend the download.
void DownloadSuspended() final;
// Called by the media stream, on the main thread, when the download
// has been resumed by the cache or because the element itself
// asked the decoder to resumed the download.
void DownloadResumed();
// Called to indicate the download is progressing.
void DownloadProgressed() final;
// Called by the media decoder to indicate whether the media cache has
// suspended the channel.
void NotifySuspendedByCache(bool aSuspendedByCache) final;
// Return true if the media element is actually invisible to users.
bool IsActuallyInvisible() const override;
// Return true if the element is in the view port.
bool IsInViewPort() const;
// Called by the media decoder and the video frame to get the
// ImageContainer containing the video data.
VideoFrameContainer* GetVideoFrameContainer() final;
layers::ImageContainer* GetImageContainer();
/**
* Call this to reevaluate whether we should start/stop due to our owner
* document being active, inactive, visible or hidden.
*/
void NotifyOwnerDocumentActivityChanged();
// Called when the media element enters or leaves the fullscreen.
void NotifyFullScreenChanged();
bool IsInFullScreen() const;
// From PrincipalChangeObserver<MediaStreamTrack>.
void PrincipalChanged(MediaStreamTrack* aTrack) override;
void UpdateSrcStreamVideoPrincipal(const PrincipalHandle& aPrincipalHandle);
// Called after the MediaStream we're playing rendered a frame to aContainer
// with a different principalHandle than the previous frame.
void PrincipalHandleChangedForVideoFrameContainer(
VideoFrameContainer* aContainer,
const PrincipalHandle& aNewPrincipalHandle) override;
// Dispatch events
void DispatchAsyncEvent(const nsAString& aName) final;
void DispatchAsyncEvent(RefPtr<nsMediaEventRunner> aRunner);
// Triggers a recomputation of readyState.
void UpdateReadyState() override {
mWatchManager.ManualNotify(&HTMLMediaElement::UpdateReadyStateInternal);
}
// Dispatch events that were raised while in the bfcache
nsresult DispatchPendingMediaEvents();
// Return true if we can activate autoplay assuming enough data has arrived.
bool CanActivateAutoplay();
// Notify that state has changed that might cause an autoplay element to
// start playing.
// If the element is 'autoplay' and is ready to play back (not paused,
// autoplay pref enabled, etc), it should start playing back.
void CheckAutoplayDataReady();
// Check if the media element had crossorigin set when loading started
bool ShouldCheckAllowOrigin();
// Returns true if the currently loaded resource is CORS same-origin with
// respect to the document.
bool IsCORSSameOrigin();
// Is the media element potentially playing as defined by the HTML 5
// specification.
// http://www.whatwg.org/specs/web-apps/current-work/#potentially-playing
bool IsPotentiallyPlaying() const;
// Has playback ended as defined by the HTML 5 specification.
// http://www.whatwg.org/specs/web-apps/current-work/#ended
bool IsPlaybackEnded() const;
// principal of the currently playing resource. Anything accessing the
// contents of this element must have a principal that subsumes this
// principal. Returns null if nothing is playing.
already_AddRefed<nsIPrincipal> GetCurrentPrincipal();
// Return true if the loading of this resource required cross-origin
// redirects.
bool HadCrossOriginRedirects();
// Principal of the currently playing video resource. Anything accessing the
// image container of this element must have a principal that subsumes this
// principal. If there are no live video tracks but content has been rendered
// to the image container, we return the last video principal we had. Should
// the image container be empty with no live video tracks, we return nullptr.
already_AddRefed<nsIPrincipal> GetCurrentVideoPrincipal();
// called to notify that the principal of the decoder's media resource has
// changed.
void NotifyDecoderPrincipalChanged() final;
void GetEMEInfo(dom::EMEDebugInfo& aInfo);
// Update the visual size of the media. Called from the decoder on the
// main thread when/if the size changes.
virtual void UpdateMediaSize(const nsIntSize& aSize);
// Like UpdateMediaSize, but only updates the size if no size has yet
// been set.
void UpdateInitialMediaSize(const nsIntSize& aSize);
void Invalidate(bool aImageSizeChanged, Maybe<nsIntSize>& aNewIntrinsicSize,
bool aForceInvalidate) override;
// Returns the CanPlayStatus indicating if we can handle the
// full MIME type including the optional codecs parameter.
static CanPlayStatus GetCanPlay(const nsAString& aType,
DecoderDoctorDiagnostics* aDiagnostics);
/**
* Called when a child source element is added to this media element. This
* may queue a task to run the select resource algorithm if appropriate.
*/
void NotifyAddedSource();
/**
* Called when there's been an error fetching the resource. This decides
* whether it's appropriate to fire an error event.
*/
void NotifyLoadError(const nsACString& aErrorDetails = nsCString());
/**
* Called by one of our associated MediaTrackLists (audio/video) when a
* MediaTrack is added.
*/
void NotifyMediaTrackAdded(dom::MediaTrack* aTrack);
/**
* Called by one of our associated MediaTrackLists (audio/video) when a
* MediaTrack is removed.
*/
void NotifyMediaTrackRemoved(dom::MediaTrack* aTrack);
/**
* Called by one of our associated MediaTrackLists (audio/video) when an
* AudioTrack is enabled or a VideoTrack is selected.
*/
void NotifyMediaTrackEnabled(dom::MediaTrack* aTrack);
/**
* Called by one of our associated MediaTrackLists (audio/video) when an
* AudioTrack is disabled or a VideoTrack is unselected.
*/
void NotifyMediaTrackDisabled(dom::MediaTrack* aTrack);
/**
* Returns the current load ID. Asynchronous events store the ID that was
* current when they were enqueued, and if it has changed when they come to
* fire, they consider themselves cancelled, and don't fire.
*/
uint32_t GetCurrentLoadID() { return mCurrentLoadID; }
/**
* Returns the load group for this media element's owner document.
* XXX XBL2 issue.
*/
already_AddRefed<nsILoadGroup> GetDocumentLoadGroup();
/**
* Returns true if the media has played or completed a seek.
* Used by video frame to determine whether to paint the poster.
*/
bool GetPlayedOrSeeked() const { return mHasPlayedOrSeeked; }
nsresult CopyInnerTo(Element* aDest);
/**
* Sets the Accept header on the HTTP channel to the required
* video or audio MIME types.
*/
virtual nsresult SetAcceptHeader(nsIHttpChannel* aChannel) = 0;
/**
* Sets the required request headers on the HTTP channel for
* video or audio requests.
*/
void SetRequestHeaders(nsIHttpChannel* aChannel);
/**
* Asynchronously awaits a stable state, whereupon aRunnable runs on the main
* thread. This adds an event which run aRunnable to the appshell's list of
* sections synchronous the next time control returns to the event loop.
*/
void RunInStableState(nsIRunnable* aRunnable);
/**
* Fires a timeupdate event. If aPeriodic is true, the event will only
* be fired if we've not fired a timeupdate event (for any reason) in the
* last 250ms, as required by the spec when the current time is periodically
* increasing during playback.
*/
void FireTimeUpdate(TimeupdateType aType);
void MaybeQueueTimeupdateEvent() final {
FireTimeUpdate(TimeupdateType::ePeriodic);
}
const TimeStamp& LastTimeupdateDispatchTime() const;
void UpdateLastTimeupdateDispatchTime();
// WebIDL
MediaError* GetError() const;
void GetSrc(nsAString& aSrc) { GetURIAttr(nsGkAtoms::src, nullptr, aSrc); }
void SetSrc(const nsAString& aSrc, ErrorResult& aError) {
SetHTMLAttr(nsGkAtoms::src, aSrc, aError);
}
void SetSrc(const nsAString& aSrc, nsIPrincipal* aTriggeringPrincipal,
ErrorResult& aError) {
SetHTMLAttr(nsGkAtoms::src, aSrc, aTriggeringPrincipal, aError);
}
void GetCurrentSrc(nsAString& aCurrentSrc);
void GetCrossOrigin(nsAString& aResult) {
// Null for both missing and invalid defaults is ok, since we
// always parse to an enum value, so we don't need an invalid
// default, and we _want_ the missing default to be null.
GetEnumAttr(nsGkAtoms::crossorigin, nullptr, aResult);
}
void SetCrossOrigin(const nsAString& aCrossOrigin, ErrorResult& aError) {
SetOrRemoveNullableStringAttr(nsGkAtoms::crossorigin, aCrossOrigin, aError);
}
uint16_t NetworkState() const { return mNetworkState; }
void NotifyXPCOMShutdown() final;
// Called by media decoder when the audible state changed or when input is
// a media stream.
void SetAudibleState(bool aAudible) final;
// Notify agent when the MediaElement changes its audible state.
void NotifyAudioPlaybackChanged(AudibleChangedReasons aReason);
void GetPreload(nsAString& aValue) {
if (mSrcAttrStream) {
nsGkAtoms::none->ToString(aValue);
return;
}
GetEnumAttr(nsGkAtoms::preload, nullptr, aValue);
}
void SetPreload(const nsAString& aValue, ErrorResult& aRv) {
if (mSrcAttrStream) {
return;
}
SetHTMLAttr(nsGkAtoms::preload, aValue, aRv);
}
already_AddRefed<TimeRanges> Buffered() const;
void Load();
void CanPlayType(const nsAString& aType, nsAString& aResult);
uint16_t ReadyState() const { return mReadyState; }
bool Seeking() const;
double CurrentTime() const;
void SetCurrentTime(double aCurrentTime, ErrorResult& aRv);
void SetCurrentTime(double aCurrentTime) {
SetCurrentTime(aCurrentTime, IgnoreErrors());
}
void FastSeek(double aTime, ErrorResult& aRv);
already_AddRefed<Promise> SeekToNextFrame(ErrorResult& aRv);
double Duration() const;
bool HasAudio() const { return mMediaInfo.HasAudio(); }
virtual bool IsVideo() const { return false; }
bool HasVideo() const { return mMediaInfo.HasVideo(); }
bool IsEncrypted() const { return mIsEncrypted; }
bool Paused() const { return mPaused; }
double DefaultPlaybackRate() const {
if (mSrcAttrStream) {
return 1.0;
}
return mDefaultPlaybackRate;
}
void SetDefaultPlaybackRate(double aDefaultPlaybackRate, ErrorResult& aRv);
double PlaybackRate() const {
if (mSrcAttrStream) {
return 1.0;
}
return mPlaybackRate;
}
void SetPlaybackRate(double aPlaybackRate, ErrorResult& aRv);
already_AddRefed<TimeRanges> Played();
already_AddRefed<TimeRanges> Seekable() const;
bool Ended();
bool Autoplay() const { return GetBoolAttr(nsGkAtoms::autoplay); }
void SetAutoplay(bool aValue, ErrorResult& aRv) {
SetHTMLBoolAttr(nsGkAtoms::autoplay, aValue, aRv);
}
bool Loop() const { return GetBoolAttr(nsGkAtoms::loop); }
void SetLoop(bool aValue, ErrorResult& aRv) {
SetHTMLBoolAttr(nsGkAtoms::loop, aValue, aRv);
}
already_AddRefed<Promise> Play(ErrorResult& aRv);
void Play() {
IgnoredErrorResult dummy;
RefPtr<Promise> toBeIgnored = Play(dummy);
}
void Pause(ErrorResult& aRv);
void Pause() { Pause(IgnoreErrors()); }
bool Controls() const { return GetBoolAttr(nsGkAtoms::controls); }
void SetControls(bool aValue, ErrorResult& aRv) {
SetHTMLBoolAttr(nsGkAtoms::controls, aValue, aRv);
}
double Volume() const { return mVolume; }
void SetVolume(double aVolume, ErrorResult& aRv);
bool Muted() const { return mMuted & MUTED_BY_CONTENT; }
void SetMuted(bool aMuted);
bool DefaultMuted() const { return GetBoolAttr(nsGkAtoms::muted); }
void SetDefaultMuted(bool aMuted, ErrorResult& aRv) {
SetHTMLBoolAttr(nsGkAtoms::muted, aMuted, aRv);
}
bool MozAllowCasting() const { return mAllowCasting; }
void SetMozAllowCasting(bool aShow) { mAllowCasting = aShow; }
bool MozIsCasting() const { return mIsCasting; }
void SetMozIsCasting(bool aShow) { mIsCasting = aShow; }
// Returns whether a call to Play() would be rejected with NotAllowedError.
// This assumes "worst case" for unknowns. So if prompting for permission is
// enabled and no permission is stored, this behaves as if the user would
// opt to block.
bool AllowedToPlay() const;
already_AddRefed<MediaSource> GetMozMediaSourceObject() const;
// Returns a promise which will be resolved after collecting debugging
// data from decoder/reader/MDSM. Used for debugging purposes.
already_AddRefed<Promise> MozRequestDebugInfo(ErrorResult& aRv);
// Enables DecoderDoctorLogger logging. Used for debugging purposes.
static void MozEnableDebugLog(const GlobalObject&);
// Returns a promise which will be resolved after collecting debugging
// log associated with this element. Used for debugging purposes.
already_AddRefed<Promise> MozRequestDebugLog(ErrorResult& aRv);
// For use by mochitests. Enabling pref "media.test.video-suspend"
void SetVisible(bool aVisible);
// For use by mochitests. Enabling pref "media.test.video-suspend"
bool HasSuspendTaint() const;
// For use by mochitests.
bool IsVideoDecodingSuspended() const;
// These functions return accumulated time, which are used for the telemetry
// usage. Return -1 for error.
double TotalPlayTime() const;
double InvisiblePlayTime() const;
double VideoDecodeSuspendedTime() const;
// Test methods for decoder doctor.
void SetFormatDiagnosticsReportForMimeType(const nsAString& aMimeType,
DecoderDoctorReportType aType);
void SetDecodeError(const nsAString& aError, ErrorResult& aRv);
void SetAudioSinkFailedStartup();
// Synchronously, return the next video frame and mark the element unable to
// participate in decode suspending.
//
// This function is synchronous for cases where decoding has been suspended
// and JS needs a frame to use in, eg., nsLayoutUtils::SurfaceFromElement()
// via drawImage().
already_AddRefed<layers::Image> GetCurrentImage();
already_AddRefed<DOMMediaStream> GetSrcObject() const;
void SetSrcObject(DOMMediaStream& aValue);
void SetSrcObject(DOMMediaStream* aValue);
bool MozPreservesPitch() const { return mPreservesPitch; }
void SetMozPreservesPitch(bool aPreservesPitch);
MediaKeys* GetMediaKeys() const;
already_AddRefed<Promise> SetMediaKeys(MediaKeys* mediaKeys,
ErrorResult& aRv);
mozilla::dom::EventHandlerNonNull* GetOnencrypted();
void SetOnencrypted(mozilla::dom::EventHandlerNonNull* aCallback);
mozilla::dom::EventHandlerNonNull* GetOnwaitingforkey();
void SetOnwaitingforkey(mozilla::dom::EventHandlerNonNull* aCallback);
void DispatchEncrypted(const nsTArray<uint8_t>& aInitData,
const nsAString& aInitDataType) override;
bool IsEventAttributeNameInternal(nsAtom* aName) override;
bool ContainsRestrictedContent();
void NotifyWaitingForKey() override;
already_AddRefed<DOMMediaStream> CaptureAudio(ErrorResult& aRv,
MediaTrackGraph* aGraph);
already_AddRefed<DOMMediaStream> MozCaptureStream(ErrorResult& aRv);
already_AddRefed<DOMMediaStream> MozCaptureStreamUntilEnded(ErrorResult& aRv);
bool MozAudioCaptured() const { return mAudioCaptured; }
void MozGetMetadata(JSContext* aCx, JS::MutableHandle<JSObject*> aResult,
ErrorResult& aRv);
double MozFragmentEnd();
AudioTrackList* AudioTracks();
VideoTrackList* VideoTracks();
TextTrackList* GetTextTracks();
already_AddRefed<TextTrack> AddTextTrack(TextTrackKind aKind,
const nsAString& aLabel,
const nsAString& aLanguage);
void AddTextTrack(TextTrack* aTextTrack) {
GetOrCreateTextTrackManager()->AddTextTrack(aTextTrack);
}
void RemoveTextTrack(TextTrack* aTextTrack, bool aPendingListOnly = false) {
if (mTextTrackManager) {
mTextTrackManager->RemoveTextTrack(aTextTrack, aPendingListOnly);
}
}
void NotifyCueAdded(TextTrackCue& aCue) {
if (mTextTrackManager) {
mTextTrackManager->NotifyCueAdded(aCue);
}
}
void NotifyCueRemoved(TextTrackCue& aCue) {
if (mTextTrackManager) {
mTextTrackManager->NotifyCueRemoved(aCue);
}
}
void NotifyCueUpdated(TextTrackCue* aCue) {
if (mTextTrackManager) {
mTextTrackManager->NotifyCueUpdated(aCue);
}
}
void NotifyCueDisplayStatesChanged();
bool IsBlessed() const { return mIsBlessed; }
// A method to check whether we are currently playing.
bool IsCurrentlyPlaying() const;
// Returns true if the media element is being destroyed. Used in
// dormancy checks to prevent dormant processing for an element
// that will soon be gone.
bool IsBeingDestroyed();
void OnVisibilityChange(Visibility aNewVisibility);
// Begin testing only methods
float ComputedVolume() const;
bool ComputedMuted() const;
// Return true if the media has been suspended media due to an inactive
// document or prohibiting by the docshell.
bool IsSuspendedByInactiveDocOrDocShell() const;
// End testing only methods
void SetMediaInfo(const MediaInfo& aInfo);
MediaInfo GetMediaInfo() const override;
// Gives access to the decoder's frame statistics, if present.
FrameStatistics* GetFrameStatistics() const override;
void DispatchAsyncTestingEvent(const nsAString& aName) override;
AbstractThread* AbstractMainThread() const final;
// Telemetry: to record the usage of a {visible / invisible} video element as
// the source of {drawImage(), createPattern(), createImageBitmap() and
// captureStream()} APIs.
enum class CallerAPI {
DRAW_IMAGE,
CREATE_PATTERN,
CREATE_IMAGEBITMAP,
CAPTURE_STREAM,
};
void MarkAsContentSource(CallerAPI aAPI);
Document* GetDocument() const override;
already_AddRefed<GMPCrashHelper> CreateGMPCrashHelper() override;
nsISerialEventTarget* MainThreadEventTarget() {
return mMainThreadEventTarget;
}
// Set the sink id (of the output device) that the audio will play. If aSinkId
// is empty the default device will be set.
already_AddRefed<Promise> SetSinkId(const nsAString& aSinkId,
ErrorResult& aRv);
// Get the sink id of the device that audio is being played. Initial value is
// empty and the default device is being used.
void GetSinkId(nsString& aSinkId) {
MOZ_ASSERT(NS_IsMainThread());
aSinkId = mSink.first;
}
// This is used to notify MediaElementAudioSourceNode that media element is
// allowed to play when media element is used as a source for web audio, so
// that we can start AudioContext if it was not allowed to start.
RefPtr<GenericNonExclusivePromise> GetAllowedToPlayPromise();
bool GetShowPosterFlag() const { return mShowPoster; }
bool IsAudible() const;
// Return key system in use if we have one, otherwise return nothing.
Maybe<nsAutoString> GetKeySystem() const override;
protected:
virtual ~HTMLMediaElement();
class AudioChannelAgentCallback;
class ChannelLoader;
class ErrorSink;
class MediaElementTrackSource;
class MediaLoadListener;
class MediaStreamRenderer;
class MediaStreamTrackListener;
class ShutdownObserver;
class MediaControlKeyListener;
MediaDecoderOwner::NextFrameStatus NextFrameStatus();
void SetDecoder(MediaDecoder* aDecoder);
void PlayInternal(bool aHandlingUserInput);
// See spec, https://html.spec.whatwg.org/#internal-pause-steps
void PauseInternal();
/** Use this method to change the mReadyState member, so required
* events can be fired.
*/
void ChangeReadyState(nsMediaReadyState aState);
/**
* Use this method to change the mNetworkState member, so required
* actions will be taken during the transition.
*/
void ChangeNetworkState(nsMediaNetworkState aState);
/**
* The MediaElement will be responsible for creating and releasing the audio
* wakelock depending on the playing and audible state.
*/
virtual void WakeLockRelease();
virtual void UpdateWakeLock();
void CreateAudioWakeLockIfNeeded();
void ReleaseAudioWakeLockIfExists();
RefPtr<WakeLock> mWakeLock;
/**
* Logs a warning message to the web console to report various failures.
* aMsg is the localized message identifier, aParams is the parameters to
* be substituted into the localized message, and aParamCount is the number
* of parameters in aParams.
*/
void ReportLoadError(const char* aMsg, const nsTArray<nsString>& aParams =
nsTArray<nsString>());
/**
* Log message to web console.
*/
void ReportToConsole(
uint32_t aErrorFlags, const char* aMsg,
const nsTArray<nsString>& aParams = nsTArray<nsString>()) const;
/**
* Changes mHasPlayedOrSeeked to aValue. If mHasPlayedOrSeeked changes
* we'll force a reflow so that the video frame gets reflowed to reflect
* the poster hiding or showing immediately.
*/
void SetPlayedOrSeeked(bool aValue);
/**
* Initialize the media element for playback of aStream
*/
void SetupSrcMediaStreamPlayback(DOMMediaStream* aStream);
/**
* Stop playback on mSrcStream.
*/
void EndSrcMediaStreamPlayback();
/**
* Ensure we're playing mSrcStream if and only if we're not paused.
*/
enum { REMOVING_SRC_STREAM = 0x1 };
void UpdateSrcMediaStreamPlaying(uint32_t aFlags = 0);
/**
* Ensure currentTime progresses if and only if we're potentially playing
* mSrcStream. Called by the watch manager while we're playing mSrcStream, and
* one of the inputs to the potentially playing algorithm changes.
*/
void UpdateSrcStreamPotentiallyPlaying();
/**
* mSrcStream's graph's CurrentTime() has been updated. It might be time to
* fire "timeupdate".
*/
void UpdateSrcStreamTime();
/**
* Called after a tail dispatch when playback of mSrcStream ended, to comply
* with the spec where we must start reporting true for the ended attribute
* after the event loop returns to step 1. A MediaStream could otherwise be
* manipulated to end a HTMLMediaElement synchronously.
*/
void UpdateSrcStreamReportPlaybackEnded();
/**
* Called by our DOMMediaStream::TrackListener when a new MediaStreamTrack has
* been added to the playback stream of |mSrcStream|.
*/
void NotifyMediaStreamTrackAdded(const RefPtr<MediaStreamTrack>& aTrack);
/**
* Called by our DOMMediaStream::TrackListener when a MediaStreamTrack in
* |mSrcStream|'s playback stream has ended.
*/
void NotifyMediaStreamTrackRemoved(const RefPtr<MediaStreamTrack>& aTrack);
/**
* Convenience method to get in a single list all enabled AudioTracks and, if
* this is a video element, the selected VideoTrack.
*/
void GetAllEnabledMediaTracks(nsTArray<RefPtr<MediaTrack>>& aTracks);
/**
* Enables or disables all tracks forwarded from mSrcStream to all
* OutputMediaStreams. We do this for muting the tracks when pausing,
* and unmuting when playing the media element again.
*/
void SetCapturedOutputStreamsEnabled(bool aEnabled);
/**
* Returns true if output tracks should be muted, based on the state of this
* media element.
*/
enum class OutputMuteState { Muted, Unmuted };
OutputMuteState OutputTracksMuted();
/**
* Sets the muted state of all output track sources. They are muted when we're
* paused and unmuted otherwise.
*/
void UpdateOutputTracksMuting();
/**
* Create a new MediaStreamTrack for the TrackSource corresponding to aTrack
* and add it to the DOMMediaStream in aOutputStream. This automatically sets
* the output track to enabled or disabled depending on our current playing
* state.
*/
enum class AddTrackMode { ASYNC, SYNC };
void AddOutputTrackSourceToOutputStream(
MediaElementTrackSource* aSource, OutputMediaStream& aOutputStream,
AddTrackMode aMode = AddTrackMode::ASYNC);
/**
* Creates output track sources when this media element is captured, tracks
* exist, playback is not ended and readyState is >= HAVE_METADATA.
*/
void UpdateOutputTrackSources();
/**
* Returns an DOMMediaStream containing the played contents of this
* element. When aBehavior is FINISH_WHEN_ENDED, when this element ends
* playback we will finish the stream and not play any more into it. When
* aType is CONTINUE_WHEN_ENDED, ending playback does not finish the stream.
* The stream will never finish.
*
* When aType is CAPTURE_AUDIO, we stop playout of audio and instead route it
* to the DOMMediaStream. Volume and mute state will be applied to the audio
* reaching the stream. No video tracks will be captured in this case.
*/
already_AddRefed<DOMMediaStream> CaptureStreamInternal(
StreamCaptureBehavior aFinishBehavior,
StreamCaptureType aStreamCaptureType, MediaTrackGraph* aGraph);
/**
* Initialize a decoder as a clone of an existing decoder in another
* element.
* mLoadingSrc must already be set.
*/
nsresult InitializeDecoderAsClone(ChannelMediaDecoder* aOriginal);
/**
* Call Load() and FinishDecoderSetup() on the decoder. It also handle
* resource cloning if DecoderType is ChannelMediaDecoder.
*/
template <typename DecoderType, typename... LoadArgs>
nsresult SetupDecoder(DecoderType* aDecoder, LoadArgs&&... aArgs);
/**
* Initialize a decoder to load the given channel. The decoder's stream
* listener is returned via aListener.
* mLoadingSrc must already be set.
*/
nsresult InitializeDecoderForChannel(nsIChannel* aChannel,
nsIStreamListener** aListener);
/**
* Finish setting up the decoder after Load() has been called on it.
* Called by InitializeDecoderForChannel/InitializeDecoderAsClone.
*/
nsresult FinishDecoderSetup(MediaDecoder* aDecoder);
/**
* Call this after setting up mLoadingSrc and mDecoder.
*/
void AddMediaElementToURITable();
/**
* Call this before modifying mLoadingSrc.
*/
void RemoveMediaElementFromURITable();
/**
* Call this to find a media element with the same NodePrincipal and
* mLoadingSrc set to aURI, and with a decoder on which Load() has been
* called.
*/
HTMLMediaElement* LookupMediaElementURITable(nsIURI* aURI);
/**
* Shutdown and clear mDecoder and maintain associated invariants.
*/
void ShutdownDecoder();
/**
* Execute the initial steps of the load algorithm that ensure existing
* loads are aborted, the element is emptied, and a new load ID is
* created.
*/
void AbortExistingLoads();
/**
* This is the dedicated media source failure steps.
* Called when all potential resources are exhausted. Changes network
* state to NETWORK_NO_SOURCE, and sends error event with code
* MEDIA_ERR_SRC_NOT_SUPPORTED.
*/
void NoSupportedMediaSourceError(
const nsACString& aErrorDetails = nsCString());
/**
* Per spec, Failed with elements: Queue a task, using the DOM manipulation
* task source, to fire a simple event named error at the candidate element.
* So dispatch |QueueLoadFromSourceTask| to main thread to make sure the task
* will be executed later than loadstart event.
*/
void DealWithFailedElement(nsIContent* aSourceElement);
/**
* Attempts to load resources from the <source> children. This is a
* substep of the resource selection algorithm. Do not call this directly,
* call QueueLoadFromSourceTask() instead.
*/
void LoadFromSourceChildren();
/**
* Asynchronously awaits a stable state, and then causes
* LoadFromSourceChildren() to be called on the main threads' event loop.
*/
void QueueLoadFromSourceTask();
/**
* Runs the media resource selection algorithm.
*/
void SelectResource();
/**
* A wrapper function that allows us to cleanly reset flags after a call
* to SelectResource()
*/
void SelectResourceWrapper();
/**
* Asynchronously awaits a stable state, and then causes SelectResource()
* to be run on the main thread's event loop.
*/
void QueueSelectResourceTask();
/**
* When loading a new source on an existing media element, make sure to reset
* everything that is accessible using the media element API.
*/
void ResetState();
/**
* The resource-fetch algorithm step of the load algorithm.
*/
MediaResult LoadResource();
/**
* Selects the next <source> child from which to load a resource. Called
* during the resource selection algorithm. Stores the return value in
* mSourceLoadCandidate before returning.
*/
Element* GetNextSource();
/**
* Changes mDelayingLoadEvent, and will call BlockOnLoad()/UnblockOnLoad()
* on the owning document, so it can delay the load event firing.
*/
void ChangeDelayLoadStatus(bool aDelay);
/**
* If we suspended downloading after the first frame, unsuspend now.
*/
void StopSuspendingAfterFirstFrame();
/**
* Called when our channel is redirected to another channel.
* Updates our mChannel reference to aNewChannel.
*/
nsresult OnChannelRedirect(nsIChannel* aChannel, nsIChannel* aNewChannel,
uint32_t aFlags);
/**
* Call this to reevaluate whether we should be holding a self-reference.
*/
void AddRemoveSelfReference();
/**
* Called when "xpcom-shutdown" event is received.
*/
void NotifyShutdownEvent();
/**
* Possible values of the 'preload' attribute.
*/
enum PreloadAttrValue : uint8_t {
PRELOAD_ATTR_EMPTY, // set to ""
PRELOAD_ATTR_NONE, // set to "none"
PRELOAD_ATTR_METADATA, // set to "metadata"
PRELOAD_ATTR_AUTO // set to "auto"
};
/**
* The preloading action to perform. These dictate how we react to the
* preload attribute. See mPreloadAction.
*/
enum PreloadAction {
PRELOAD_UNDEFINED = 0, // not determined - used only for initialization
PRELOAD_NONE = 1, // do not preload
PRELOAD_METADATA = 2, // preload only the metadata (and first frame)
PRELOAD_ENOUGH = 3 // preload enough data to allow uninterrupted
// playback
};
/**
* The guts of Load(). Load() acts as a wrapper around this which sets
* mIsDoingExplicitLoad to true so that when script calls 'load()'
* preload-none will be automatically upgraded to preload-metadata.
*/
void DoLoad();
/**
* Suspends the load of mLoadingSrc, so that it can be resumed later
* by ResumeLoad(). This is called when we have a media with a 'preload'
* attribute value of 'none', during the resource selection algorithm.
*/
void SuspendLoad();
/**
* Resumes a previously suspended load (suspended by SuspendLoad(uri)).
* Will continue running the resource selection algorithm.
* Sets mPreloadAction to aAction.
*/
void ResumeLoad(PreloadAction aAction);
/**
* Handle a change to the preload attribute. Should be called whenever the
* value (or presence) of the preload attribute changes. The change in
* attribute value may cause a change in the mPreloadAction of this
* element. If there is a change then this method will initiate any
* behaviour that is necessary to implement the action.
*/
void UpdatePreloadAction();
/**
* Fire progress events if needed according to the time and byte constraints
* outlined in the specification. aHaveNewProgress is true if progress has
* just been detected. Otherwise the method is called as a result of the
* progress timer.
*/
void CheckProgress(bool aHaveNewProgress);
static void ProgressTimerCallback(nsITimer* aTimer, void* aClosure);
/**
* Start timer to update download progress.
*/
void StartProgressTimer();
/**
* Start sending progress and/or stalled events.
*/
void StartProgress();
/**
* Stop progress information timer and events.
*/
void StopProgress();
/**
* Dispatches an error event to a child source element.
*/
void DispatchAsyncSourceError(nsIContent* aSourceElement);
/**
* Resets the media element for an error condition as per aErrorCode.
* aErrorCode must be one of WebIDL HTMLMediaElement error codes.
*/
void Error(uint16_t aErrorCode,
const nsACString& aErrorDetails = nsCString());
/**
* Returns the URL spec of the currentSrc.
**/
void GetCurrentSpec(nsCString& aString);
/**
* Process any media fragment entries in the URI
*/
void ProcessMediaFragmentURI();
/**
* Mute or unmute the audio and change the value that the |muted| map.
*/
void SetMutedInternal(uint32_t aMuted);
/**
* Update the volume of the output audio stream to match the element's
* current mMuted/mVolume/mAudioChannelFaded state.
*/
void SetVolumeInternal();
/**
* Suspend or resume element playback and resource download. When we suspend
* playback, event delivery would also be suspended (and events queued) until
* the element is resumed.
*/
void SuspendOrResumeElement(bool aSuspendElement);
// Get the HTMLMediaElement object if the decoder is being used from an
// HTML media element, and null otherwise.
HTMLMediaElement* GetMediaElement() final { return this; }
// Return true if decoding should be paused
bool GetPaused() final { return Paused(); }
// Seeks to aTime seconds. aSeekType can be Exact to seek to exactly the
// seek target, or PrevSyncPoint if a quicker but less precise seek is
// desired, and we'll seek to the sync point (keyframe and/or start of the
// next block of audio samples) preceeding seek target.
void Seek(double aTime, SeekTarget::Type aSeekType, ErrorResult& aRv);
// Update the audio channel playing state
void UpdateAudioChannelPlayingState();
// Adds to the element's list of pending text tracks each text track
// in the element's list of text tracks whose text track mode is not disabled
// and whose text track readiness state is loading.
void PopulatePendingTextTrackList();
// Gets a reference to the MediaElement's TextTrackManager. If the
// MediaElement doesn't yet have one then it will create it.
TextTrackManager* GetOrCreateTextTrackManager();
// Recomputes ready state and fires events as necessary based on current
// state.
void UpdateReadyStateInternal();
// Create or destroy the captured stream.
void AudioCaptureTrackChange(bool aCapture);
// If the network state is empty and then we would trigger DoLoad().
void MaybeDoLoad();
// Anything we need to check after played success and not related with spec.
void UpdateCustomPolicyAfterPlayed();
// Returns a StreamCaptureType populated with the right bits, depending on the
// tracks this HTMLMediaElement has.
StreamCaptureType CaptureTypeForElement();
// True if this element can be captured, false otherwise.
bool CanBeCaptured(StreamCaptureType aCaptureType);
using nsGenericHTMLElement::DispatchEvent;
// For nsAsyncEventRunner.
nsresult DispatchEvent(const nsAString& aName);
already_AddRefed<nsMediaEventRunner> GetEventRunner(
const nsAString& aName, EventFlag aFlag = EventFlag::eNone);
// This method moves the mPendingPlayPromises into a temperate object. So the
// mPendingPlayPromises is cleared after this method call.
nsTArray<RefPtr<PlayPromise>> TakePendingPlayPromises();
// This method snapshots the mPendingPlayPromises by TakePendingPlayPromises()
// and queues a task to resolve them.
void AsyncResolvePendingPlayPromises();
// This method snapshots the mPendingPlayPromises by TakePendingPlayPromises()
// and queues a task to reject them.
void AsyncRejectPendingPlayPromises(nsresult aError);
// This method snapshots the mPendingPlayPromises by TakePendingPlayPromises()
// and queues a task to resolve them also to dispatch a "playing" event.
void NotifyAboutPlaying();
already_AddRefed<Promise> CreateDOMPromise(ErrorResult& aRv) const;
// Pass information for deciding the video decode mode to decoder.
void NotifyDecoderActivityChanges() const;
// Constructs an AudioTrack in mAudioTrackList if aInfo reports that audio is
// available, and a VideoTrack in mVideoTrackList if aInfo reports that video
// is available.
void ConstructMediaTracks(const MediaInfo* aInfo);
// Removes all MediaTracks from mAudioTrackList and mVideoTrackList and fires
// "removetrack" on the lists accordingly.
// Note that by spec, this should not fire "removetrack". However, it appears
// other user agents do, per
// https://wpt.fyi/results/media-source/mediasource-avtracks.html.
void RemoveMediaTracks();
// Mark the decoder owned by the element as tainted so that the
// suspend-video-decoder is disabled.
void MarkAsTainted();
virtual nsresult AfterSetAttr(int32_t aNameSpaceID, nsAtom* aName,
const nsAttrValue* aValue,
const nsAttrValue* aOldValue,
nsIPrincipal* aMaybeScriptedPrincipal,
bool aNotify) override;
virtual nsresult OnAttrSetButNotChanged(int32_t aNamespaceID, nsAtom* aName,
const nsAttrValueOrString& aValue,
bool aNotify) override;
bool DetachExistingMediaKeys();
bool TryRemoveMediaKeysAssociation();
void RemoveMediaKeys();
bool AttachNewMediaKeys();
bool TryMakeAssociationWithCDM(CDMProxy* aProxy);
void MakeAssociationWithCDMResolved();
void SetCDMProxyFailure(const MediaResult& aResult);
void ResetSetMediaKeysTempVariables();
void PauseIfShouldNotBePlaying();
WatchManager<HTMLMediaElement> mWatchManager;
// When the play is not allowed, dispatch related events which are used for
// testing or changing control UI.
void DispatchEventsWhenPlayWasNotAllowed();
// When the doc is blocked permanantly, we would dispatch event to notify
// front-end side to show blocking icon.
void MaybeNotifyAutoplayBlocked();
// Dispatch event for video control when video gets blocked in order to show
// the click-to-play icon.
void DispatchBlockEventForVideoControl();
// When playing state change, we have to notify MediaControl in the chrome
// process in order to keep its playing state correct.
void NotifyMediaControlPlaybackStateChanged();
// Clear the timer when we want to continue listening to the media control
// key events.
void ClearStopMediaControlTimerIfNeeded();
// Sets a secondary renderer for mSrcStream, so this media element can be
// rendered in Picture-in-Picture mode when playing a MediaStream. A null
// aContainer will unset the secondary renderer. aFirstFrameOutput allows
// for injecting a listener of the callers choice for rendering the first
// frame.
void SetSecondaryMediaStreamRenderer(
VideoFrameContainer* aContainer,
FirstFrameVideoOutput* aFirstFrameOutput = nullptr);
// This function is used to update the status of media control when the media
// changes its status of being used in the Picture-in-Picture mode.
void UpdateMediaControlAfterPictureInPictureModeChanged();
// The current decoder. Load() has been called on this decoder.
// At most one of mDecoder and mSrcStream can be non-null.
RefPtr<MediaDecoder> mDecoder;
// The DocGroup-specific nsISerialEventTarget of this HTML element on the main
// thread.
nsCOMPtr<nsISerialEventTarget> mMainThreadEventTarget;
// The DocGroup-specific AbstractThread::MainThread() of this HTML element.
RefPtr<AbstractThread> mAbstractMainThread;
// A reference to the VideoFrameContainer which contains the current frame
// of video to display.
RefPtr<VideoFrameContainer> mVideoFrameContainer;
// Holds a reference to the MediaStream that has been set in the src
// attribute.
RefPtr<DOMMediaStream> mSrcAttrStream;
// Holds the triggering principal for the src attribute.
nsCOMPtr<nsIPrincipal> mSrcAttrTriggeringPrincipal;
// Holds a reference to the MediaStream that we're actually playing.
// At most one of mDecoder and mSrcStream can be non-null.
RefPtr<DOMMediaStream> mSrcStream;
// The MediaStreamRenderer handles rendering of our selected video track, and
// enabled audio tracks, while mSrcStream is set.
RefPtr<MediaStreamRenderer> mMediaStreamRenderer;
// The secondary MediaStreamRenderer handles rendering of our selected video
// track to a secondary VideoFrameContainer, while mSrcStream is set.
RefPtr<MediaStreamRenderer> mSecondaryMediaStreamRenderer;
// True once PlaybackEnded() is called and we're playing a MediaStream.
// Reset to false if we start playing mSrcStream again.
Watchable<bool> mSrcStreamPlaybackEnded = {
false, "HTMLMediaElement::mSrcStreamPlaybackEnded"};
// Mirrors mSrcStreamPlaybackEnded after a tail dispatch when set to true,
// but may be be forced to false directly. To accomodate when an application
// ends playback synchronously by manipulating mSrcStream or its tracks,
// e.g., through MediaStream.removeTrack(), or MediaStreamTrack.stop().
bool mSrcStreamReportPlaybackEnded = false;
// Holds a reference to the stream connecting this stream to the window
// capture sink.
UniquePtr<MediaStreamWindowCapturer> mStreamWindowCapturer;
// Holds references to the DOM wrappers for the MediaStreams that we're
// writing to.
nsTArray<OutputMediaStream> mOutputStreams;
// Mapping for output tracks, from dom::MediaTrack ids to the
// MediaElementTrackSource that represents the source of all corresponding
// MediaStreamTracks captured from this element.
nsRefPtrHashtable<nsStringHashKey, MediaElementTrackSource>
mOutputTrackSources;
// The currently selected video stream track.
RefPtr<VideoStreamTrack> mSelectedVideoStreamTrack;
const RefPtr<ShutdownObserver> mShutdownObserver;
// Holds a reference to the MediaSource, if any, referenced by the src
// attribute on the media element.
RefPtr<MediaSource> mSrcMediaSource;
// Holds a reference to the MediaSource supplying data for playback. This
// may either match mSrcMediaSource or come from Source element children.
// This is set when and only when mLoadingSrc corresponds to an object url
// that resolved to a MediaSource.
RefPtr<MediaSource> mMediaSource;
RefPtr<ChannelLoader> mChannelLoader;
// Points to the child source elements, used to iterate through the children
// when selecting a resource to load. This is the previous sibling of the
// child considered the current 'candidate' in:
// https://html.spec.whatwg.org/multipage/media.html#concept-media-load-algorithm
//
// mSourcePointer == nullptr, we will next try to load |GetFirstChild()|.
// mSourcePointer == GetLastChild(), we've exhausted all sources, waiting
// for new elements to be appended.
nsCOMPtr<nsIContent> mSourcePointer;
// Points to the document whose load we're blocking. This is the document
// we're bound to when loading starts.
nsCOMPtr<Document> mLoadBlockedDoc;
// This is used to help us block/resume the event delivery.
class EventBlocker;
RefPtr<EventBlocker> mEventBlocker;
// Media loading flags. See:
// http://www.whatwg.org/specs/web-apps/current-work/#video)
nsMediaNetworkState mNetworkState = HTMLMediaElement_Binding::NETWORK_EMPTY;
Watchable<nsMediaReadyState> mReadyState = {
HTMLMediaElement_Binding::HAVE_NOTHING, "HTMLMediaElement::mReadyState"};
enum LoadAlgorithmState {
// No load algorithm instance is waiting for a source to be added to the
// media in order to continue loading.
NOT_WAITING,
// We've run the load algorithm, and we tried all source children of the
// media element, and failed to load any successfully. We're waiting for
// another source element to be added to the media element, and will try
// to load any such element when its added.
WAITING_FOR_SOURCE
};
// The current media load ID. This is incremented every time we start a
// new load. Async events note the ID when they're first sent, and only fire
// if the ID is unchanged when they come to fire.
uint32_t mCurrentLoadID = 0;
// Denotes the waiting state of a load algorithm instance. When the load
// algorithm is waiting for a source element child to be added, this is set
// to WAITING_FOR_SOURCE, otherwise it's NOT_WAITING.
LoadAlgorithmState mLoadWaitStatus = NOT_WAITING;
// Current audio volume
double mVolume = 1.0;
// True if the audio track is not silent.
bool mIsAudioTrackAudible = false;
enum MutedReasons {
MUTED_BY_CONTENT = 0x01,
MUTED_BY_INVALID_PLAYBACK_RATE = 0x02,
MUTED_BY_AUDIO_CHANNEL = 0x04,
MUTED_BY_AUDIO_TRACK = 0x08
};
uint32_t mMuted = 0;
UniquePtr<const MetadataTags> mTags;
// URI of the resource we're attempting to load. This stores the value we
// return in the currentSrc attribute. Use GetCurrentSrc() to access the
// currentSrc attribute.
// This is always the original URL we're trying to load --- before
// redirects etc.
nsCOMPtr<nsIURI> mLoadingSrc;
// The triggering principal for the current source.
nsCOMPtr<nsIPrincipal> mLoadingSrcTriggeringPrincipal;
// Stores the current preload action for this element. Initially set to
// PRELOAD_UNDEFINED, its value is changed by calling
// UpdatePreloadAction().
PreloadAction mPreloadAction = PRELOAD_UNDEFINED;
// Time that the last timeupdate event was queued. Read/Write from the
// main thread only.
TimeStamp mQueueTimeUpdateRunnerTime;
// Time that the last timeupdate event was fired. Read/Write from the
// main thread only.
TimeStamp mLastTimeUpdateDispatchTime;
// Time that the last progress event was fired. Read/Write from the
// main thread only.
TimeStamp mProgressTime;
// Time that data was last read from the media resource. Used for
// computing if the download has stalled and to rate limit progress events
// when data is arriving slower than PROGRESS_MS.
// Read/Write from the main thread only.
TimeStamp mDataTime;
// Media 'currentTime' value when the last timeupdate event was queued.
// Read/Write from the main thread only.
double mLastCurrentTime = 0.0;
// Logical start time of the media resource in seconds as obtained
// from any media fragments. A negative value indicates that no
// fragment time has been set. Read/Write from the main thread only.
double mFragmentStart = -1.0;
// Logical end time of the media resource in seconds as obtained
// from any media fragments. A negative value indicates that no
// fragment time has been set. Read/Write from the main thread only.
double mFragmentEnd = -1.0;
// The defaultPlaybackRate attribute gives the desired speed at which the
// media resource is to play, as a multiple of its intrinsic speed.
double mDefaultPlaybackRate = 1.0;
// The playbackRate attribute gives the speed at which the media resource
// plays, as a multiple of its intrinsic speed. If it is not equal to the
// defaultPlaybackRate, then the implication is that the user is using a
// feature such as fast forward or slow motion playback.
double mPlaybackRate = 1.0;
// True if pitch correction is applied when playbackRate is set to a
// non-intrinsic value.
bool mPreservesPitch = true;
// Reference to the source element last returned by GetNextSource().
// This is the child source element which we're trying to load from.
nsCOMPtr<nsIContent> mSourceLoadCandidate;
// Range of time played.
RefPtr<TimeRanges> mPlayed;
// Timer used for updating progress events.
nsCOMPtr<nsITimer> mProgressTimer;
// Encrypted Media Extension media keys.
RefPtr<MediaKeys> mMediaKeys;
RefPtr<MediaKeys> mIncomingMediaKeys;
// The dom promise is used for HTMLMediaElement::SetMediaKeys.
RefPtr<DetailedPromise> mSetMediaKeysDOMPromise;
// Used to indicate if the MediaKeys attaching operation is on-going or not.
bool mAttachingMediaKey = false;
MozPromiseRequestHolder<SetCDMPromise> mSetCDMRequest;
// Stores the time at the start of the current 'played' range.
double mCurrentPlayRangeStart = 1.0;
// True if loadeddata has been fired.
bool mLoadedDataFired = false;
// Indicates whether current playback is a result of user action
// (ie. calling of the Play method), or automatic playback due to
// the 'autoplay' attribute being set. A true value indicates the
// latter case.
// The 'autoplay' HTML attribute indicates that the video should
// start playing when loaded. The 'autoplay' attribute of the object
// is a mirror of the HTML attribute. These are different from this
// 'mAutoplaying' flag, which indicates whether the current playback
// is a result of the autoplay attribute.
bool mAutoplaying = true;
// Playback of the video is paused either due to calling the
// 'Pause' method, or playback not yet having started.
Watchable<bool> mPaused = {true, "HTMLMediaElement::mPaused"};
// The following two fields are here for the private storage of the builtin
// video controls, and control 'casting' of the video to external devices
// (TVs, projectors etc.)
// True if casting is currently allowed
bool mAllowCasting = false;
// True if currently casting this video
bool mIsCasting = false;
// Set while there are some OutputMediaStreams this media element's enabled
// and selected tracks are captured into. When set, all tracks are captured
// into the graph of this dummy track.
// NB: This is a SharedDummyTrack to allow non-default graphs (AudioContexts
// with an explicit sampleRate defined) to capture this element. When
// cross-graph tracks are supported, this can become a bool.
Watchable<RefPtr<SharedDummyTrack>> mTracksCaptured;
// True if the sound is being captured.
bool mAudioCaptured = false;
// If TRUE then the media element was actively playing before the currently
// in progress seeking. If FALSE then the media element is either not seeking
// or was not actively playing before the current seek. Used to decide whether
// to raise the 'waiting' event as per 4.7.1.8 in HTML 5 specification.
bool mPlayingBeforeSeek = false;
// True if this element is suspended because the document is inactive or the
// inactive docshell is not allowing media to play.
bool mSuspendedByInactiveDocOrDocshell = false;
// True if we're running the "load()" method.
bool mIsRunningLoadMethod = false;
// True if we're running or waiting to run queued tasks due to an explicit
// call to "load()".
bool mIsDoingExplicitLoad = false;
// True if we're loading the resource from the child source elements.
bool mIsLoadingFromSourceChildren = false;
// True if we're delaying the "load" event. They are delayed until either
// an error occurs, or the first frame is loaded.
bool mDelayingLoadEvent = false;
// True when we've got a task queued to call SelectResource(),
// or while we're running SelectResource().
bool mIsRunningSelectResource = false;
// True when we already have select resource call queued
bool mHaveQueuedSelectResource = false;
// True if we suspended the decoder because we were paused,
// preloading metadata is enabled, autoplay was not enabled, and we loaded
// the first frame.
bool mSuspendedAfterFirstFrame = false;
// True if we are allowed to suspend the decoder because we were paused,
// preloading metdata was enabled, autoplay was not enabled, and we loaded
// the first frame.
bool mAllowSuspendAfterFirstFrame = true;
// True if we've played or completed a seek. We use this to determine
// when the poster frame should be shown.
bool mHasPlayedOrSeeked = false;
// True if we've added a reference to ourselves to keep the element
// alive while no-one is referencing it but the element may still fire
// events of its own accord.
bool mHasSelfReference = false;
// True if we've received a notification that the engine is shutting
// down.
bool mShuttingDown = false;
// True if we've suspended a load in the resource selection algorithm
// due to loading a preload:none media. When true, the resource we'll
// load when the user initiates either playback or an explicit load is
// stored in mPreloadURI.
bool mSuspendedForPreloadNone = false;
// True if we've connected mSrcStream to the media element output.
bool mSrcStreamIsPlaying = false;
// True if we should set nsIClassOfService::UrgentStart to the channel to
// get the response ASAP for better user responsiveness.
bool mUseUrgentStartForChannel = false;
// The CORS mode when loading the media element
CORSMode mCORSMode = CORS_NONE;
// Info about the played media.
MediaInfo mMediaInfo;
// True if the media has encryption information.
bool mIsEncrypted = false;
enum WaitingForKeyState {
NOT_WAITING_FOR_KEY = 0,
WAITING_FOR_KEY = 1,
WAITING_FOR_KEY_DISPATCHED = 2
};
// True when the CDM cannot decrypt the current block due to lacking a key.
// Note: the "waitingforkey" event is not dispatched until all decoded data
// has been rendered.
WaitingForKeyState mWaitingForKey = NOT_WAITING_FOR_KEY;
// Listens for waitingForKey events from the owned decoder.
MediaEventListener mWaitingForKeyListener;
// Init Data that needs to be sent in 'encrypted' events in MetadataLoaded().
EncryptionInfo mPendingEncryptedInitData;
// True if the media's channel's download has been suspended.
Watchable<bool> mDownloadSuspendedByCache = {
false, "HTMLMediaElement::mDownloadSuspendedByCache"};
// Disable the video playback by track selection. This flag might not be
// enough if we ever expand the ability of supporting multi-tracks video
// playback.
bool mDisableVideo = false;
RefPtr<TextTrackManager> mTextTrackManager;
RefPtr<AudioTrackList> mAudioTrackList;
RefPtr<VideoTrackList> mVideoTrackList;
UniquePtr<MediaStreamTrackListener> mMediaStreamTrackListener;
// The principal guarding mVideoFrameContainer access when playing a
// MediaStream.
nsCOMPtr<nsIPrincipal> mSrcStreamVideoPrincipal;
// True if the autoplay media was blocked because it hadn't loaded metadata
// yet.
bool mBlockedAsWithoutMetadata = false;
// This promise is used to notify MediaElementAudioSourceNode that media
// element is allowed to play when MediaElement is used as a source for web
// audio.
MozPromiseHolder<GenericNonExclusivePromise> mAllowedToPlayPromise;
// True if media has ever been blocked for autoplay, it's used to notify front
// end to show the correct blocking icon when the document goes back from
// bfcache.
bool mHasEverBeenBlockedForAutoplay = false;
// True if we have dispatched a task for text track changed, will be unset
// when we starts processing text track changed.
// https://html.spec.whatwg.org/multipage/media.html#pending-text-track-change-notification-flag
bool mPendingTextTrackChanged = false;
public:
// This function will be called whenever a text track that is in a media
// element's list of text tracks has its text track mode change value
void NotifyTextTrackModeChanged();
private:
friend class nsMediaEventRunner;
friend class nsResolveOrRejectPendingPlayPromisesRunner;
already_AddRefed<PlayPromise> CreatePlayPromise(ErrorResult& aRv) const;
virtual void MaybeBeginCloningVisually(){};
uint32_t GetPreloadDefault() const;
uint32_t GetPreloadDefaultAuto() const;
/**
* This function is called by AfterSetAttr and OnAttrSetButNotChanged.
* It will not be called if the value is being unset.
*
* @param aNamespaceID the namespace of the attr being set
* @param aName the localname of the attribute being set
* @param aNotify Whether we plan to notify document observers.
*/
void AfterMaybeChangeAttr(int32_t aNamespaceID, nsAtom* aName, bool aNotify);
// True if Init() has been called after construction
bool mInitialized = false;
// True if user has called load(), seek() or element has started playing
// before. It's *only* use for `click-to-play` blocking autoplay policy.
// In addition, we would reset this once media aborts current load.
bool mIsBlessed = false;
// True if the first frame has been successfully loaded.
Watchable<bool> mFirstFrameLoaded = {false,
"HTMLMediaElement::mFirstFrameLoaded"};
// Media elements also have a default playback start position, which must
// initially be set to zero seconds. This time is used to allow the element to
// be seeked even before the media is loaded.
double mDefaultPlaybackStartPosition = 0.0;
// True if media element has been marked as 'tainted' and can't
// participate in video decoder suspending.
bool mHasSuspendTaint = false;
// True if media element has been forced into being considered 'hidden'.
// For use by mochitests. Enabling pref "media.test.video-suspend"
bool mForcedHidden = false;
Visibility mVisibilityState = Visibility::Untracked;
UniquePtr<ErrorSink> mErrorSink;
// This wrapper will handle all audio channel related stuffs, eg. the
// operations of tab audio indicator, Fennec's media control. Note:
// mAudioChannelWrapper might be null after GC happened.
RefPtr<AudioChannelAgentCallback> mAudioChannelWrapper;
// A list of pending play promises. The elements are pushed during the play()
// method call and are resolved/rejected during further playback steps.
nsTArray<RefPtr<PlayPromise>> mPendingPlayPromises;
// A list of already-dispatched but not yet run
// nsResolveOrRejectPendingPlayPromisesRunners.
// Runners whose Run() method is called remove themselves from this list.
// We keep track of these because the load algorithm resolves/rejects all
// already-dispatched pending play promises.
nsTArray<nsResolveOrRejectPendingPlayPromisesRunner*>
mPendingPlayPromisesRunners;
// A pending seek promise which is created at Seek() method call and is
// resolved/rejected at AsyncResolveSeekDOMPromiseIfExists()/
// AsyncRejectSeekDOMPromiseIfExists() methods.
RefPtr<dom::Promise> mSeekDOMPromise;
// Return true if the docshell is inactive and explicitly wants to stop media
// playing in that shell.
bool ShouldBeSuspendedByInactiveDocShell() const;
// For debugging bug 1407148.
void AssertReadyStateIsNothing();
// Contains the unique id of the sink device and the device info.
// The initial value is ("", nullptr) and the default output device is used.
// It can contain an invalid id and info if the device has been
// unplugged. It can be set to ("", nullptr). It follows the spec attribute:
// https://w3c.github.io/mediacapture-output/#htmlmediaelement-extensions
// Read/Write from the main thread only.
std::pair<nsString, RefPtr<AudioDeviceInfo>> mSink;
// This flag is used to control when the user agent is to show a poster frame
// for a video element instead of showing the video contents.
// https://html.spec.whatwg.org/multipage/media.html#show-poster-flag
bool mShowPoster;
// We may delay starting playback of a media for an unvisited tab until it's
// going to foreground. We would create ResumeDelayedMediaPlaybackAgent to
// handle related operations at the time whenever delaying media playback is
// needed.
void CreateResumeDelayedMediaPlaybackAgentIfNeeded();
void ClearResumeDelayedMediaPlaybackAgentIfNeeded();
RefPtr<ResumeDelayedPlaybackAgent> mResumeDelayedPlaybackAgent;
MozPromiseRequestHolder<ResumeDelayedPlaybackAgent::ResumePromise>
mResumePlaybackRequest;
// Return true if we have already a decoder or a src stream and don't have any
// error.
bool IsPlayable() const;
// Return true if the media qualifies for being controlled by media control
// keys.
bool ShouldStartMediaControlKeyListener() const;
// Start the listener if media fits the requirement of being able to be
// controlled be media control keys.
void StartMediaControlKeyListenerIfNeeded();
// It's used to listen media control key, by which we would play or pause
// media element.
RefPtr<MediaControlKeyListener> mMediaControlKeyListener;
// Return true if the media element is being used in picture in picture mode.
bool IsBeingUsedInPictureInPictureMode() const;
// Return true if we should queue a 'timeupdate' event runner to main thread.
bool ShouldQueueTimeupdateAsyncTask(TimeupdateType aType) const;
};
// Check if the context is chrome or has the debugger or tabs permission
bool HasDebuggerOrTabsPrivilege(JSContext* aCx, JSObject* aObj);
} // namespace dom
} // namespace mozilla
#endif // mozilla_dom_HTMLMediaElement_h
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