blob: c59a4182563e6c03f741fe4cc76bccdf4b9af5c2 [file] [log] [blame]
/*
* Copyright (C) 2014-2021 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#if ENABLE(VIDEO)
#include "MediaElementSession.h"
#include "Chrome.h"
#include "ChromeClient.h"
#include "DocumentInlines.h"
#include "DocumentLoader.h"
#include "ElementInlines.h"
#include "Frame.h"
#include "FrameView.h"
#include "FullscreenManager.h"
#include "HTMLAudioElement.h"
#include "HTMLMediaElement.h"
#include "HTMLNames.h"
#include "HTMLVideoElement.h"
#include "HitTestResult.h"
#include "Logging.h"
#include "MediaUsageInfo.h"
#include "NowPlayingInfo.h"
#include "Page.h"
#include "PlatformMediaSessionManager.h"
#include "Quirks.h"
#include "RenderMedia.h"
#include "RenderView.h"
#include "ScriptController.h"
#include "Settings.h"
#include "SourceBuffer.h"
#include <wtf/text/StringBuilder.h>
#if ENABLE(MEDIA_SESSION)
#include "MediaMetadata.h"
#include "MediaPositionState.h"
#include "MediaSession.h"
#include "MediaSessionPlaybackState.h"
#include "NavigatorMediaSession.h"
#endif
#if PLATFORM(IOS_FAMILY)
#include "AudioSession.h"
#include "RuntimeApplicationChecks.h"
#include <wtf/cocoa/RuntimeApplicationChecksCocoa.h>
#endif
namespace WebCore {
static const Seconds clientDataBufferingTimerThrottleDelay { 100_ms };
static const Seconds elementMainContentCheckInterval { 250_ms };
static bool isElementRectMostlyInMainFrame(const HTMLMediaElement&);
static bool isElementLargeEnoughForMainContent(const HTMLMediaElement&, MediaSessionMainContentPurpose);
static bool isElementMainContentForPurposesOfAutoplay(const HTMLMediaElement&, bool shouldHitTestMainFrame);
#if !RELEASE_LOG_DISABLED
static String restrictionNames(MediaElementSession::BehaviorRestrictions restriction)
{
StringBuilder restrictionBuilder;
#define CASE(restrictionType) \
if (restriction & MediaElementSession::restrictionType) { \
if (!restrictionBuilder.isEmpty()) \
restrictionBuilder.append(", "); \
restrictionBuilder.append(#restrictionType); \
} \
CASE(NoRestrictions)
CASE(RequireUserGestureForLoad)
CASE(RequireUserGestureForVideoRateChange)
CASE(RequireUserGestureForAudioRateChange)
CASE(RequireUserGestureForFullscreen)
CASE(RequirePageConsentToLoadMedia)
CASE(RequirePageConsentToResumeMedia)
CASE(RequireUserGestureToShowPlaybackTargetPicker)
CASE(WirelessVideoPlaybackDisabled)
CASE(RequireUserGestureToAutoplayToExternalDevice)
CASE(AutoPreloadingNotPermitted)
CASE(InvisibleAutoplayNotPermitted)
CASE(OverrideUserGestureRequirementForMainContent)
CASE(RequireUserGestureToControlControlsManager)
CASE(RequirePlaybackToControlControlsManager)
CASE(RequireUserGestureForVideoDueToLowPowerMode)
return restrictionBuilder.toString();
}
#endif
static bool pageExplicitlyAllowsElementToAutoplayInline(const HTMLMediaElement& element)
{
Document& document = element.document();
Page* page = document.page();
return document.isMediaDocument() && !document.ownerElement() && page && page->allowsMediaDocumentInlinePlayback();
}
#if ENABLE(MEDIA_SESSION)
class MediaSessionObserver : public MediaSession::Observer {
WTF_MAKE_FAST_ALLOCATED;
public:
MediaSessionObserver(MediaElementSession& session, const Ref<MediaSession>& mediaSession)
: m_session(session), m_mediaSession(mediaSession)
{
m_mediaSession->addObserver(*this);
}
~MediaSessionObserver()
{
m_mediaSession->removeObserver(*this);
}
void metadataChanged(const RefPtr<MediaMetadata>& metadata) final
{
if (m_session)
m_session->metadataChanged(metadata);
}
void positionStateChanged(const std::optional<MediaPositionState>& state) final
{
if (m_session)
m_session->positionStateChanged(state);
}
void playbackStateChanged(MediaSessionPlaybackState state) final
{
if (m_session)
m_session->playbackStateChanged(state);
}
void actionHandlersChanged()
{
if (m_session)
m_session->actionHandlersChanged();
}
private:
WeakPtr<MediaElementSession> m_session;
Ref<MediaSession> m_mediaSession;
};
#endif
MediaElementSession::MediaElementSession(HTMLMediaElement& element)
: PlatformMediaSession(PlatformMediaSessionManager::sharedManager(), element)
, m_element(element)
, m_restrictions(NoRestrictions)
#if ENABLE(WIRELESS_PLAYBACK_TARGET)
, m_targetAvailabilityChangedTimer(*this, &MediaElementSession::targetAvailabilityChangedTimerFired)
#endif
, m_mainContentCheckTimer(*this, &MediaElementSession::mainContentCheckTimerFired)
, m_clientDataBufferingTimer(*this, &MediaElementSession::clientDataBufferingTimerFired)
#if !RELEASE_LOG_DISABLED
, m_logIdentifier(element.logIdentifier())
#endif
{
}
MediaElementSession::~MediaElementSession()
{
#if ENABLE(MEDIA_USAGE)
auto page = m_element.document().page();
if (page && m_haveAddedMediaUsageManagerSession)
page->chrome().client().removeMediaUsageManagerSession(mediaSessionIdentifier());
#endif
}
void MediaElementSession::addMediaUsageManagerSessionIfNecessary()
{
#if ENABLE(MEDIA_USAGE)
if (m_haveAddedMediaUsageManagerSession)
return;
auto page = m_element.document().page();
if (!page)
return;
m_haveAddedMediaUsageManagerSession = true;
page->chrome().client().addMediaUsageManagerSession(mediaSessionIdentifier(), m_element.sourceApplicationIdentifier(), m_element.document().url());
#endif
}
void MediaElementSession::registerWithDocument(Document& document)
{
#if ENABLE(WIRELESS_PLAYBACK_TARGET)
document.addPlaybackTargetPickerClient(*this);
#else
UNUSED_PARAM(document);
#endif
ensureIsObservingMediaSession();
}
void MediaElementSession::unregisterWithDocument(Document& document)
{
#if ENABLE(WIRELESS_PLAYBACK_TARGET)
document.removePlaybackTargetPickerClient(*this);
#else
UNUSED_PARAM(document);
#endif
#if ENABLE(MEDIA_SESSION)
m_observer = nullptr;
#endif
}
void MediaElementSession::clientWillBeginAutoplaying()
{
PlatformMediaSession::clientWillBeginAutoplaying();
m_elementIsHiddenBecauseItWasRemovedFromDOM = false;
updateClientDataBuffering();
}
bool MediaElementSession::clientWillBeginPlayback()
{
if (!PlatformMediaSession::clientWillBeginPlayback())
return false;
m_elementIsHiddenBecauseItWasRemovedFromDOM = false;
updateClientDataBuffering();
return true;
}
bool MediaElementSession::clientWillPausePlayback()
{
if (!PlatformMediaSession::clientWillPausePlayback())
return false;
updateClientDataBuffering();
return true;
}
void MediaElementSession::visibilityChanged()
{
scheduleClientDataBufferingCheck();
bool elementIsHidden = m_element.elementIsHidden();
if (elementIsHidden && !m_element.isFullscreen())
m_elementIsHiddenUntilVisibleInViewport = true;
else if (m_element.isVisibleInViewport())
m_elementIsHiddenUntilVisibleInViewport = false;
bool isPlayingAudio = m_element.isPlaying() && m_element.hasAudio() && !m_element.muted() && m_element.volume();
if (!isPlayingAudio) {
if (elementIsHidden) {
ALWAYS_LOG(LOGIDENTIFIER, "Suspending silent playback after page visibility: hidden");
beginInterruption(PlatformMediaSession::EnteringBackground);
} else {
ALWAYS_LOG(LOGIDENTIFIER, "Resuming silent playback after page visibility: showing");
endInterruption(PlatformMediaSession::MayResumePlaying);
}
return;
}
if (hasBehaviorRestriction(RequirePageVisibilityToPlayAudio)) {
if (elementIsHidden) {
ALWAYS_LOG(LOGIDENTIFIER, "Suspending audible playback after page visibility: hidden");
beginInterruption(PlatformMediaSession::EnteringBackground);
} else {
ALWAYS_LOG(LOGIDENTIFIER, "Resuming audible playback after page visibility: showing");
endInterruption(PlatformMediaSession::MayResumePlaying);
}
}
}
void MediaElementSession::isVisibleInViewportChanged()
{
scheduleClientDataBufferingCheck();
if (m_element.isFullscreen() || m_element.isVisibleInViewport())
m_elementIsHiddenUntilVisibleInViewport = false;
}
void MediaElementSession::inActiveDocumentChanged()
{
m_elementIsHiddenBecauseItWasRemovedFromDOM = !m_element.inActiveDocument();
scheduleClientDataBufferingCheck();
}
void MediaElementSession::scheduleClientDataBufferingCheck()
{
if (!m_clientDataBufferingTimer.isActive())
m_clientDataBufferingTimer.startOneShot(clientDataBufferingTimerThrottleDelay);
}
void MediaElementSession::clientDataBufferingTimerFired()
{
INFO_LOG(LOGIDENTIFIER, "visible = ", m_element.elementIsHidden());
updateClientDataBuffering();
#if PLATFORM(IOS_FAMILY)
PlatformMediaSessionManager::sharedManager().configureWireLessTargetMonitoring();
#endif
if (state() != Playing || !m_element.elementIsHidden())
return;
PlatformMediaSessionManager::SessionRestrictions restrictions = PlatformMediaSessionManager::sharedManager().restrictions(mediaType());
if ((restrictions & PlatformMediaSessionManager::BackgroundTabPlaybackRestricted) == PlatformMediaSessionManager::BackgroundTabPlaybackRestricted)
pauseSession();
}
void MediaElementSession::updateClientDataBuffering()
{
if (m_clientDataBufferingTimer.isActive())
m_clientDataBufferingTimer.stop();
m_element.setBufferingPolicy(preferredBufferingPolicy());
}
void MediaElementSession::addBehaviorRestriction(BehaviorRestrictions restrictions)
{
if (restrictions & ~m_restrictions)
INFO_LOG(LOGIDENTIFIER, "adding ", restrictionNames(restrictions & ~m_restrictions));
m_restrictions |= restrictions;
if (restrictions & OverrideUserGestureRequirementForMainContent)
m_mainContentCheckTimer.startRepeating(elementMainContentCheckInterval);
}
void MediaElementSession::removeBehaviorRestriction(BehaviorRestrictions restriction)
{
if (restriction & RequireUserGestureToControlControlsManager) {
m_mostRecentUserInteractionTime = MonotonicTime::now();
if (auto page = m_element.document().page())
page->setAllowsPlaybackControlsForAutoplayingAudio(true);
}
if (!(m_restrictions & restriction))
return;
INFO_LOG(LOGIDENTIFIER, "removed ", restrictionNames(m_restrictions & restriction));
m_restrictions &= ~restriction;
}
Expected<void, MediaPlaybackDenialReason> MediaElementSession::playbackStateChangePermitted(MediaPlaybackState state) const
{
INFO_LOG(LOGIDENTIFIER, "state = ", state);
if (m_element.isSuspended()) {
ALWAYS_LOG(LOGIDENTIFIER, "Returning FALSE because element is suspended");
return makeUnexpected(MediaPlaybackDenialReason::InvalidState);
}
auto& document = m_element.document();
auto* page = document.page();
if (!page || page->mediaPlaybackIsSuspended()) {
ALWAYS_LOG(LOGIDENTIFIER, "Returning FALSE because media playback is suspended");
return makeUnexpected(MediaPlaybackDenialReason::PageConsentRequired);
}
if (document.isMediaDocument() && !document.ownerElement())
return { };
if (pageExplicitlyAllowsElementToAutoplayInline(m_element))
return { };
if (requiresFullscreenForVideoPlayback() && !fullscreenPermitted()) {
ALWAYS_LOG(LOGIDENTIFIER, "Returning FALSE because of fullscreen restriction");
return makeUnexpected(MediaPlaybackDenialReason::FullscreenRequired);
}
if (m_restrictions & OverrideUserGestureRequirementForMainContent && updateIsMainContent())
return { };
#if ENABLE(MEDIA_STREAM)
if (m_element.hasMediaStreamSrcObject()) {
if (document.isCapturing())
return { };
if (document.mediaState() & MediaProducerMediaState::IsPlayingAudio)
return { };
}
#endif
// FIXME: Why are we checking top-level document only for PerDocumentAutoplayBehavior?
const auto& topDocument = document.topDocument();
if (topDocument.quirks().requiresUserGestureToPauseInPictureInPicture()
&& m_element.fullscreenMode() & HTMLMediaElementEnums::VideoFullscreenModePictureInPicture
&& !m_element.paused() && state == MediaPlaybackState::Paused
&& !document.processingUserGestureForMedia()) {
ALWAYS_LOG(LOGIDENTIFIER, "Returning FALSE because a quirk requires a user gesture to pause while in Picture-in-Picture");
return makeUnexpected(MediaPlaybackDenialReason::UserGestureRequired);
}
if (topDocument.mediaState() & MediaProducerMediaState::HasUserInteractedWithMediaElement && topDocument.quirks().needsPerDocumentAutoplayBehavior())
return { };
if (topDocument.hasHadUserInteraction() && document.quirks().shouldAutoplayForArbitraryUserGesture())
return { };
if (m_restrictions & RequireUserGestureForVideoRateChange && m_element.isVideo() && !document.processingUserGestureForMedia()) {
ALWAYS_LOG(LOGIDENTIFIER, "Returning FALSE because a user gesture is required for video rate change restriction");
return makeUnexpected(MediaPlaybackDenialReason::UserGestureRequired);
}
if (m_restrictions & RequireUserGestureForAudioRateChange && (!m_element.isVideo() || m_element.hasAudio()) && !m_element.muted() && m_element.volume() && !document.processingUserGestureForMedia()) {
ALWAYS_LOG(LOGIDENTIFIER, "Returning FALSE because a user gesture is required for audio rate change restriction");
return makeUnexpected(MediaPlaybackDenialReason::UserGestureRequired);
}
if (m_restrictions & RequirePageVisibilityToPlayAudio && (!m_element.isVideo() || m_element.hasAudio()) && !m_element.muted() && m_element.volume() && m_element.elementIsHidden()) {
ALWAYS_LOG(LOGIDENTIFIER, "Returning FALSE because page visibility required for audio rate change restriction");
return makeUnexpected(MediaPlaybackDenialReason::UserGestureRequired);
}
if (m_restrictions & RequireUserGestureForVideoDueToLowPowerMode && m_element.isVideo() && !document.processingUserGestureForMedia()) {
ALWAYS_LOG(LOGIDENTIFIER, "Returning FALSE because of video low power mode restriction");
return makeUnexpected(MediaPlaybackDenialReason::UserGestureRequired);
}
return { };
}
bool MediaElementSession::autoplayPermitted() const
{
const Document& document = m_element.document();
if (document.backForwardCacheState() != Document::NotInBackForwardCache)
return false;
if (document.activeDOMObjectsAreSuspended())
return false;
if (!hasBehaviorRestriction(MediaElementSession::InvisibleAutoplayNotPermitted))
return true;
// If the media element is audible, allow autoplay even when not visible as pausing it would be observable by the user.
if ((!m_element.isVideo() || m_element.hasAudio()) && !m_element.muted() && m_element.volume())
return true;
auto* renderer = m_element.renderer();
if (!renderer) {
ALWAYS_LOG(LOGIDENTIFIER, "Returning FALSE because element has no renderer");
return false;
}
if (renderer->style().visibility() != Visibility::Visible) {
ALWAYS_LOG(LOGIDENTIFIER, "Returning FALSE because element is not visible");
return false;
}
if (renderer->view().frameView().isOffscreen()) {
ALWAYS_LOG(LOGIDENTIFIER, "Returning FALSE because frame is offscreen");
return false;
}
if (renderer->visibleInViewportState() != VisibleInViewportState::Yes) {
ALWAYS_LOG(LOGIDENTIFIER, "Returning FALSE because element is not visible in the viewport");
return false;
}
return true;
}
bool MediaElementSession::dataLoadingPermitted() const
{
if (m_restrictions & OverrideUserGestureRequirementForMainContent && updateIsMainContent())
return true;
if (m_restrictions & RequireUserGestureForLoad && !m_element.document().processingUserGestureForMedia()) {
INFO_LOG(LOGIDENTIFIER, "returning FALSE");
return false;
}
return true;
}
MediaPlayer::BufferingPolicy MediaElementSession::preferredBufferingPolicy() const
{
if (isSuspended())
return MediaPlayer::BufferingPolicy::MakeResourcesPurgeable;
if (bufferingSuspended())
return MediaPlayer::BufferingPolicy::LimitReadAhead;
if (state() == PlatformMediaSession::Playing)
return MediaPlayer::BufferingPolicy::Default;
if (shouldOverrideBackgroundLoadingRestriction())
return MediaPlayer::BufferingPolicy::Default;
#if ENABLE(WIRELESS_PLAYBACK_TARGET)
if (m_shouldPlayToPlaybackTarget)
return MediaPlayer::BufferingPolicy::Default;
#endif
if (m_elementIsHiddenUntilVisibleInViewport || m_elementIsHiddenBecauseItWasRemovedFromDOM || m_element.elementIsHidden())
return MediaPlayer::BufferingPolicy::MakeResourcesPurgeable;
return MediaPlayer::BufferingPolicy::Default;
}
bool MediaElementSession::fullscreenPermitted() const
{
if (m_restrictions & RequireUserGestureForFullscreen && !m_element.document().processingUserGestureForMedia()) {
INFO_LOG(LOGIDENTIFIER, "returning FALSE");
return false;
}
return true;
}
bool MediaElementSession::pageAllowsDataLoading() const
{
Page* page = m_element.document().page();
if (m_restrictions & RequirePageConsentToLoadMedia && page && !page->canStartMedia()) {
INFO_LOG(LOGIDENTIFIER, "returning FALSE");
return false;
}
return true;
}
bool MediaElementSession::pageAllowsPlaybackAfterResuming() const
{
Page* page = m_element.document().page();
if (m_restrictions & RequirePageConsentToResumeMedia && page && !page->canStartMedia()) {
INFO_LOG(LOGIDENTIFIER, "returning FALSE");
return false;
}
return true;
}
bool MediaElementSession::canShowControlsManager(PlaybackControlsPurpose purpose) const
{
if (m_element.isSuspended() || !m_element.inActiveDocument()) {
INFO_LOG(LOGIDENTIFIER, "returning FALSE: isSuspended()");
return false;
}
if (m_element.isFullscreen()) {
INFO_LOG(LOGIDENTIFIER, "returning TRUE: is fullscreen");
return true;
}
if (m_element.muted()) {
INFO_LOG(LOGIDENTIFIER, "returning FALSE: muted");
return false;
}
if (m_element.document().isMediaDocument() && (m_element.document().frame() && m_element.document().frame()->isMainFrame())) {
INFO_LOG(LOGIDENTIFIER, "returning TRUE: is media document");
return true;
}
if (client().presentationType() == MediaType::Audio && (purpose == PlaybackControlsPurpose::ControlsManager || purpose == PlaybackControlsPurpose::MediaSession)) {
if (!hasBehaviorRestriction(RequireUserGestureToControlControlsManager) || m_element.document().processingUserGestureForMedia()) {
INFO_LOG(LOGIDENTIFIER, "returning TRUE: audio element with user gesture");
return true;
}
if (m_element.isPlaying() && allowsPlaybackControlsForAutoplayingAudio()) {
INFO_LOG(LOGIDENTIFIER, "returning TRUE: user has played media before");
return true;
}
INFO_LOG(LOGIDENTIFIER, "returning FALSE: audio element is not suitable");
return false;
}
if (purpose == PlaybackControlsPurpose::ControlsManager && !isElementRectMostlyInMainFrame(m_element)) {
INFO_LOG(LOGIDENTIFIER, "returning FALSE: not in main frame");
return false;
}
if (!m_element.hasAudio() && !m_element.hasEverHadAudio()) {
INFO_LOG(LOGIDENTIFIER, "returning FALSE: no audio");
return false;
}
if (!playbackStateChangePermitted(MediaPlaybackState::Playing)) {
INFO_LOG(LOGIDENTIFIER, "returning FALSE: playback not permitted");
return false;
}
if (!hasBehaviorRestriction(RequireUserGestureToControlControlsManager) || m_element.document().processingUserGestureForMedia()) {
INFO_LOG(LOGIDENTIFIER, "returning TRUE: no user gesture required");
return true;
}
if (purpose == PlaybackControlsPurpose::ControlsManager && hasBehaviorRestriction(RequirePlaybackToControlControlsManager) && !m_element.isPlaying()) {
INFO_LOG(LOGIDENTIFIER, "returning FALSE: needs to be playing");
return false;
}
if (purpose != PlaybackControlsPurpose::MediaSession && !m_element.hasEverNotifiedAboutPlaying()) {
INFO_LOG(LOGIDENTIFIER, "returning FALSE: hasn't fired playing notification");
return false;
}
#if ENABLE(FULLSCREEN_API)
// Elements which are not descendants of the current fullscreen element cannot be main content.
auto* fullscreenElement = m_element.document().fullscreenManager().currentFullscreenElement();
if (fullscreenElement && !m_element.isDescendantOf(*fullscreenElement)) {
INFO_LOG(LOGIDENTIFIER, "returning FALSE: outside of full screen");
return false;
}
#endif
// Only allow the main content heuristic to forbid videos from showing up if our purpose is the controls manager.
if (purpose == PlaybackControlsPurpose::ControlsManager && m_element.isVideo()) {
if (!m_element.renderer()) {
INFO_LOG(LOGIDENTIFIER, "returning FALSE: no renderer");
return false;
}
if (!m_element.hasVideo() && !m_element.hasEverHadVideo()) {
INFO_LOG(LOGIDENTIFIER, "returning FALSE: no video");
return false;
}
if (isLargeEnoughForMainContent(MediaSessionMainContentPurpose::MediaControls)) {
INFO_LOG(LOGIDENTIFIER, "returning TRUE: is main content");
return true;
}
}
if (purpose == PlaybackControlsPurpose::NowPlaying || purpose == PlaybackControlsPurpose::MediaSession) {
INFO_LOG(LOGIDENTIFIER, "returning TRUE: potentially plays audio");
return true;
}
INFO_LOG(LOGIDENTIFIER, "returning FALSE: no user gesture");
return false;
}
bool MediaElementSession::isLargeEnoughForMainContent(MediaSessionMainContentPurpose purpose) const
{
return isElementLargeEnoughForMainContent(m_element, purpose);
}
bool MediaElementSession::isMainContentForPurposesOfAutoplayEvents() const
{
return isElementMainContentForPurposesOfAutoplay(m_element, false);
}
MonotonicTime MediaElementSession::mostRecentUserInteractionTime() const
{
return m_mostRecentUserInteractionTime;
}
bool MediaElementSession::wantsToObserveViewportVisibilityForMediaControls() const
{
return isLargeEnoughForMainContent(MediaSessionMainContentPurpose::MediaControls);
}
bool MediaElementSession::wantsToObserveViewportVisibilityForAutoplay() const
{
return m_element.isVideo();
}
#if ENABLE(WIRELESS_PLAYBACK_TARGET)
void MediaElementSession::showPlaybackTargetPicker()
{
INFO_LOG(LOGIDENTIFIER);
auto& document = m_element.document();
if (m_restrictions & RequireUserGestureToShowPlaybackTargetPicker && !document.processingUserGestureForMedia()) {
INFO_LOG(LOGIDENTIFIER, "returning early because of permissions");
return;
}
if (!document.page()) {
INFO_LOG(LOGIDENTIFIER, "returning early because page is NULL");
return;
}
#if !PLATFORM(IOS_FAMILY)
if (m_element.readyState() < HTMLMediaElementEnums::HAVE_METADATA) {
INFO_LOG(LOGIDENTIFIER, "returning early because element is not playable");
return;
}
#endif
auto& audioSession = AudioSession::sharedSession();
document.showPlaybackTargetPicker(*this, is<HTMLVideoElement>(m_element), audioSession.routeSharingPolicy(), audioSession.routingContextUID());
}
bool MediaElementSession::hasWirelessPlaybackTargets() const
{
INFO_LOG(LOGIDENTIFIER, "returning ", m_hasPlaybackTargets);
return m_hasPlaybackTargets;
}
bool MediaElementSession::wirelessVideoPlaybackDisabled() const
{
if (!m_element.document().settings().allowsAirPlayForMediaPlayback()) {
INFO_LOG(LOGIDENTIFIER, "returning TRUE because of settings");
return true;
}
if (m_element.hasAttributeWithoutSynchronization(HTMLNames::webkitwirelessvideoplaybackdisabledAttr)) {
INFO_LOG(LOGIDENTIFIER, "returning TRUE because of attribute");
return true;
}
#if PLATFORM(IOS_FAMILY)
auto& legacyAirplayAttributeValue = m_element.attributeWithoutSynchronization(HTMLNames::webkitairplayAttr);
if (equalLettersIgnoringASCIICase(legacyAirplayAttributeValue, "deny")) {
INFO_LOG(LOGIDENTIFIER, "returning TRUE because of legacy attribute");
return true;
}
if (equalLettersIgnoringASCIICase(legacyAirplayAttributeValue, "allow")) {
INFO_LOG(LOGIDENTIFIER, "returning FALSE because of legacy attribute");
return false;
}
#endif
if (m_element.document().settings().remotePlaybackEnabled() && m_element.hasAttributeWithoutSynchronization(HTMLNames::disableremoteplaybackAttr)) {
LOG(Media, "MediaElementSession::wirelessVideoPlaybackDisabled - returning TRUE because of RemotePlayback attribute");
return true;
}
auto player = m_element.player();
if (!player)
return true;
bool disabled = player->wirelessVideoPlaybackDisabled();
INFO_LOG(LOGIDENTIFIER, "returning ", disabled, " because media engine says so");
return disabled;
}
void MediaElementSession::setWirelessVideoPlaybackDisabled(bool disabled)
{
if (disabled)
addBehaviorRestriction(WirelessVideoPlaybackDisabled);
else
removeBehaviorRestriction(WirelessVideoPlaybackDisabled);
auto player = m_element.player();
if (!player)
return;
INFO_LOG(LOGIDENTIFIER, disabled);
player->setWirelessVideoPlaybackDisabled(disabled);
}
void MediaElementSession::setHasPlaybackTargetAvailabilityListeners(bool hasListeners)
{
INFO_LOG(LOGIDENTIFIER, hasListeners);
#if PLATFORM(IOS_FAMILY)
m_hasPlaybackTargetAvailabilityListeners = hasListeners;
PlatformMediaSessionManager::sharedManager().configureWireLessTargetMonitoring();
#else
UNUSED_PARAM(hasListeners);
m_element.document().playbackTargetPickerClientStateDidChange(*this, m_element.mediaState());
#endif
}
void MediaElementSession::setPlaybackTarget(Ref<MediaPlaybackTarget>&& device)
{
m_playbackTarget = WTFMove(device);
client().setWirelessPlaybackTarget(*m_playbackTarget.copyRef());
}
void MediaElementSession::targetAvailabilityChangedTimerFired()
{
client().wirelessRoutesAvailableDidChange();
}
void MediaElementSession::externalOutputDeviceAvailableDidChange(bool hasTargets)
{
if (m_hasPlaybackTargets == hasTargets)
return;
INFO_LOG(LOGIDENTIFIER, hasTargets);
m_hasPlaybackTargets = hasTargets;
m_targetAvailabilityChangedTimer.startOneShot(0_s);
}
bool MediaElementSession::isPlayingToWirelessPlaybackTarget() const
{
#if !PLATFORM(IOS_FAMILY)
if (!m_playbackTarget || !m_playbackTarget->hasActiveRoute())
return false;
#endif
return client().isPlayingToWirelessPlaybackTarget();
}
void MediaElementSession::setShouldPlayToPlaybackTarget(bool shouldPlay)
{
INFO_LOG(LOGIDENTIFIER, shouldPlay);
m_shouldPlayToPlaybackTarget = shouldPlay;
updateClientDataBuffering();
client().setShouldPlayToPlaybackTarget(shouldPlay);
}
void MediaElementSession::playbackTargetPickerWasDismissed()
{
INFO_LOG(LOGIDENTIFIER);
client().playbackTargetPickerWasDismissed();
}
void MediaElementSession::mediaStateDidChange(MediaProducerMediaStateFlags state)
{
m_element.document().playbackTargetPickerClientStateDidChange(*this, state);
}
#endif
MediaPlayer::Preload MediaElementSession::effectivePreloadForElement() const
{
MediaPlayer::Preload preload = m_element.preloadValue();
if (pageExplicitlyAllowsElementToAutoplayInline(m_element))
return preload;
if (m_restrictions & AutoPreloadingNotPermitted) {
if (preload > MediaPlayer::Preload::MetaData)
return MediaPlayer::Preload::MetaData;
}
return preload;
}
bool MediaElementSession::requiresFullscreenForVideoPlayback() const
{
if (pageExplicitlyAllowsElementToAutoplayInline(m_element))
return false;
if (is<HTMLAudioElement>(m_element))
return false;
if (m_element.document().isMediaDocument()) {
ASSERT(is<HTMLVideoElement>(m_element));
const HTMLVideoElement& videoElement = *downcast<const HTMLVideoElement>(&m_element);
if (m_element.readyState() < HTMLVideoElement::HAVE_METADATA || !videoElement.hasEverHadVideo())
return false;
}
if (m_element.isTemporarilyAllowingInlinePlaybackAfterFullscreen())
return false;
if (!m_element.document().settings().allowsInlineMediaPlayback())
return true;
if (!m_element.document().settings().inlineMediaPlaybackRequiresPlaysInlineAttribute())
return false;
#if PLATFORM(IOS_FAMILY)
if (CocoaApplication::isIBooks())
return !m_element.hasAttributeWithoutSynchronization(HTMLNames::webkit_playsinlineAttr) && !m_element.hasAttributeWithoutSynchronization(HTMLNames::playsinlineAttr);
if (!linkedOnOrAfter(SDKVersion::FirstWithUnprefixedPlaysInlineAttribute))
return !m_element.hasAttributeWithoutSynchronization(HTMLNames::webkit_playsinlineAttr);
#endif
if (m_element.document().isMediaDocument() && m_element.document().ownerElement())
return false;
return !m_element.hasAttributeWithoutSynchronization(HTMLNames::playsinlineAttr);
}
bool MediaElementSession::allowsAutomaticMediaDataLoading() const
{
if (pageExplicitlyAllowsElementToAutoplayInline(m_element))
return true;
if (m_element.document().settings().mediaDataLoadsAutomatically())
return true;
return false;
}
void MediaElementSession::mediaEngineUpdated()
{
INFO_LOG(LOGIDENTIFIER);
#if ENABLE(WIRELESS_PLAYBACK_TARGET)
if (m_restrictions & WirelessVideoPlaybackDisabled)
setWirelessVideoPlaybackDisabled(true);
if (m_playbackTarget)
client().setWirelessPlaybackTarget(*m_playbackTarget.copyRef());
if (m_shouldPlayToPlaybackTarget)
client().setShouldPlayToPlaybackTarget(true);
#endif
}
void MediaElementSession::resetPlaybackSessionState()
{
m_mostRecentUserInteractionTime = MonotonicTime();
addBehaviorRestriction(RequireUserGestureToControlControlsManager | RequirePlaybackToControlControlsManager);
}
void MediaElementSession::suspendBuffering()
{
updateClientDataBuffering();
}
void MediaElementSession::resumeBuffering()
{
updateClientDataBuffering();
}
bool MediaElementSession::bufferingSuspended() const
{
if (auto* page = m_element.document().page())
return page->mediaBufferingIsSuspended();
return true;
}
bool MediaElementSession::allowsPictureInPicture() const
{
return m_element.document().settings().allowsPictureInPictureMediaPlayback();
}
#if PLATFORM(IOS_FAMILY)
bool MediaElementSession::requiresPlaybackTargetRouteMonitoring() const
{
return m_hasPlaybackTargetAvailabilityListeners && !m_element.elementIsHidden();
}
#endif
#if ENABLE(MEDIA_SOURCE)
size_t MediaElementSession::maximumMediaSourceBufferSize(const SourceBuffer& buffer) const
{
// A good quality 1080p video uses 8,000 kbps and stereo audio uses 384 kbps, so assume 95% for video and 5% for audio.
const float bufferBudgetPercentageForVideo = .95;
const float bufferBudgetPercentageForAudio = .05;
size_t maximum = buffer.document().settings().maximumSourceBufferSize();
// Allow a SourceBuffer to buffer as though it is audio-only even if it doesn't have any active tracks (yet).
size_t bufferSize = static_cast<size_t>(maximum * bufferBudgetPercentageForAudio);
if (buffer.hasVideo())
bufferSize += static_cast<size_t>(maximum * bufferBudgetPercentageForVideo);
// FIXME: we might want to modify this algorithm to:
// - decrease the maximum size for background tabs
// - decrease the maximum size allowed for inactive elements when a process has more than one
// element, eg. so a page with many elements which are played one at a time doesn't keep
// everything buffered after an element has finished playing.
return bufferSize;
}
#endif
static bool isElementMainContentForPurposesOfAutoplay(const HTMLMediaElement& element, bool shouldHitTestMainFrame)
{
Document& document = element.document();
if (!document.hasLivingRenderTree() || document.activeDOMObjectsAreStopped() || element.isSuspended() || !element.hasAudio() || !element.hasVideo())
return false;
// Elements which have not yet been laid out, or which are not yet in the DOM, cannot be main content.
auto* renderer = element.renderer();
if (!renderer)
return false;
if (!isElementLargeEnoughForMainContent(element, MediaSessionMainContentPurpose::Autoplay))
return false;
// Elements which are hidden by style, or have been scrolled out of view, cannot be main content.
// But elements which have audio & video and are already playing should not stop playing because
// they are scrolled off the page.
if (renderer->style().visibility() != Visibility::Visible)
return false;
if (renderer->visibleInViewportState() != VisibleInViewportState::Yes && !element.isPlaying())
return false;
// Main content elements must be in the main frame.
if (!document.frame() || !document.frame()->isMainFrame())
return false;
auto& mainFrame = document.frame()->mainFrame();
if (!mainFrame.view() || !mainFrame.view()->renderView())
return false;
if (!shouldHitTestMainFrame)
return true;
if (!mainFrame.document())
return false;
// Hit test the area of the main frame where the element appears, to determine if the element is being obscured.
// Elements which are obscured by other elements cannot be main content.
IntRect rectRelativeToView = element.boundingBoxInRootViewCoordinates();
ScrollPosition scrollPosition = mainFrame.view()->documentScrollPositionRelativeToViewOrigin();
IntRect rectRelativeToTopDocument(rectRelativeToView.location() + scrollPosition, rectRelativeToView.size());
OptionSet<HitTestRequest::Type> hitType { HitTestRequest::Type::ReadOnly, HitTestRequest::Type::Active, HitTestRequest::Type::AllowChildFrameContent, HitTestRequest::Type::IgnoreClipping, HitTestRequest::Type::DisallowUserAgentShadowContent };
HitTestResult result(rectRelativeToTopDocument.center());
mainFrame.document()->hitTest(hitType, result);
result.setToNonUserAgentShadowAncestor();
RefPtr<Element> hitElement = result.targetElement();
if (hitElement != &element)
return false;
return true;
}
static bool isElementRectMostlyInMainFrame(const HTMLMediaElement& element)
{
if (!element.renderer())
return false;
RefPtr documentFrame = element.document().frame();
if (!documentFrame)
return false;
auto mainFrameView = documentFrame->mainFrame().view();
if (!mainFrameView)
return false;
IntRect mainFrameRectAdjustedForScrollPosition = IntRect(-mainFrameView->documentScrollPositionRelativeToViewOrigin(), mainFrameView->contentsSize());
IntRect elementRectInMainFrame = element.boundingBoxInRootViewCoordinates();
auto totalElementArea = elementRectInMainFrame.area<RecordOverflow>();
if (totalElementArea.hasOverflowed())
return false;
elementRectInMainFrame.intersect(mainFrameRectAdjustedForScrollPosition);
return elementRectInMainFrame.area() > totalElementArea / 2;
}
static bool isElementLargeRelativeToMainFrame(const HTMLMediaElement& element)
{
static const double minimumPercentageOfMainFrameAreaForMainContent = 0.9;
auto* renderer = element.renderer();
if (!renderer)
return false;
RefPtr documentFrame = element.document().frame();
if (!documentFrame)
return false;
if (!documentFrame->mainFrame().view())
return false;
auto& mainFrameView = *documentFrame->mainFrame().view();
auto maxVisibleClientWidth = std::min(renderer->clientWidth().toInt(), mainFrameView.visibleWidth());
auto maxVisibleClientHeight = std::min(renderer->clientHeight().toInt(), mainFrameView.visibleHeight());
return maxVisibleClientWidth * maxVisibleClientHeight > minimumPercentageOfMainFrameAreaForMainContent * mainFrameView.visibleWidth() * mainFrameView.visibleHeight();
}
static bool isElementLargeEnoughForMainContent(const HTMLMediaElement& element, MediaSessionMainContentPurpose purpose)
{
static const double elementMainContentAreaMinimum = 400 * 300;
static const double maximumAspectRatio = purpose == MediaSessionMainContentPurpose::MediaControls ? 3 : 1.8;
static const double minimumAspectRatio = .5; // Slightly smaller than 9:16.
// Elements which have not yet been laid out, or which are not yet in the DOM, cannot be main content.
auto* renderer = element.renderer();
if (!renderer)
return false;
double width = renderer->clientWidth();
double height = renderer->clientHeight();
double area = width * height;
double aspectRatio = width / height;
if (area < elementMainContentAreaMinimum)
return false;
if (aspectRatio >= minimumAspectRatio && aspectRatio <= maximumAspectRatio)
return true;
return isElementLargeRelativeToMainFrame(element);
}
void MediaElementSession::mainContentCheckTimerFired()
{
if (!hasBehaviorRestriction(OverrideUserGestureRequirementForMainContent))
return;
updateIsMainContent();
}
bool MediaElementSession::updateIsMainContent() const
{
if (m_element.isSuspended())
return false;
bool wasMainContent = m_isMainContent;
m_isMainContent = isElementMainContentForPurposesOfAutoplay(m_element, true);
if (m_isMainContent != wasMainContent)
m_element.updateShouldPlay();
return m_isMainContent;
}
bool MediaElementSession::allowsPlaybackControlsForAutoplayingAudio() const
{
auto page = m_element.document().page();
return page && page->allowsPlaybackControlsForAutoplayingAudio();
}
#if ENABLE(MEDIA_SESSION)
void MediaElementSession::didReceiveRemoteControlCommand(RemoteControlCommandType commandType, const RemoteCommandArgument& argument)
{
auto* session = mediaSession();
if (!session || !session->hasActiveActionHandlers()) {
PlatformMediaSession::didReceiveRemoteControlCommand(commandType, argument);
return;
}
MediaSessionActionDetails actionDetails;
switch (commandType) {
case NoCommand:
return;
case PlayCommand:
actionDetails.action = MediaSessionAction::Play;
break;
case PauseCommand:
actionDetails.action = MediaSessionAction::Pause;
break;
case StopCommand:
actionDetails.action = MediaSessionAction::Stop;
break;
case TogglePlayPauseCommand:
actionDetails.action = m_element.paused() ? MediaSessionAction::Play : MediaSessionAction::Pause;
break;
case BeginScrubbingCommand:
m_isScrubbing = true;
return;
case EndScrubbingCommand:
m_isScrubbing = false;
return;
case SeekToPlaybackPositionCommand:
ASSERT(argument.time);
if (!argument.time)
return;
actionDetails.action = MediaSessionAction::Seekto;
actionDetails.seekTime = argument.time.value();
actionDetails.fastSeek = m_isScrubbing;
break;
case SkipForwardCommand:
if (argument.time)
actionDetails.seekOffset = argument.time.value();
actionDetails.action = MediaSessionAction::Seekforward;
break;
case SkipBackwardCommand:
if (argument.time)
actionDetails.seekOffset = argument.time.value();
actionDetails.action = MediaSessionAction::Seekbackward;
break;
case NextTrackCommand:
actionDetails.action = MediaSessionAction::Nexttrack;
break;
case PreviousTrackCommand:
actionDetails.action = MediaSessionAction::Previoustrack;
break;
case BeginSeekingBackwardCommand:
case EndSeekingBackwardCommand:
case BeginSeekingForwardCommand:
case EndSeekingForwardCommand:
ASSERT_NOT_REACHED();
return;
}
session->callActionHandler(actionDetails);
}
#endif
std::optional<NowPlayingInfo> MediaElementSession::nowPlayingInfo() const
{
auto* page = m_element.document().page();
bool allowsNowPlayingControlsVisibility = page && !page->isVisibleAndActive();
bool isPlaying = state() == PlatformMediaSession::Playing;
bool supportsSeeking = m_element.supportsSeeking();
double duration = supportsSeeking ? m_element.duration() : MediaPlayer::invalidTime();
double currentTime = m_element.currentTime();
if (!std::isfinite(currentTime) || !supportsSeeking)
currentTime = MediaPlayer::invalidTime();
#if ENABLE(MEDIA_SESSION)
auto* session = mediaSession();
auto* sessionMetadata = session ? session->metadata() : nullptr;
if (sessionMetadata) {
std::optional<NowPlayingInfoArtwork> artwork;
if (sessionMetadata->artworkImage()) {
ASSERT(sessionMetadata->artworkImage()->data(), "An image must always have associated data");
artwork = NowPlayingInfoArtwork { sessionMetadata->artworkSrc(), sessionMetadata->artworkImage()->mimeType(), sessionMetadata->artworkImage()->data() };
}
return NowPlayingInfo { sessionMetadata->title(), sessionMetadata->artist(), sessionMetadata->album(), m_element.sourceApplicationIdentifier(), duration, currentTime, supportsSeeking, m_element.mediaUniqueIdentifier(), isPlaying, allowsNowPlayingControlsVisibility, WTFMove(artwork) };
}
#endif
return NowPlayingInfo { m_element.mediaSessionTitle(), emptyString(), emptyString(), m_element.sourceApplicationIdentifier(), duration, currentTime, supportsSeeking, m_element.mediaUniqueIdentifier(), isPlaying, allowsNowPlayingControlsVisibility, { }};
}
void MediaElementSession::updateMediaUsageIfChanged()
{
auto& document = m_element.document();
auto* page = document.page();
if (!page || page->sessionID().isEphemeral())
return;
bool isOutsideOfFullscreen = false;
#if ENABLE(FULLSCREEN_API)
if (auto* fullscreenElement = document.fullscreenManager().currentFullscreenElement())
isOutsideOfFullscreen = !m_element.isDescendantOf(*fullscreenElement);
#endif
bool isAudio = client().presentationType() == MediaType::Audio;
bool isVideo = client().presentationType() == MediaType::Video;
bool processingUserGesture = document.processingUserGestureForMedia();
bool isPlaying = m_element.isPlaying();
MediaUsageInfo usage = {
m_element.currentSrc(),
state() == PlatformMediaSession::Playing,
canShowControlsManager(PlaybackControlsPurpose::ControlsManager),
!page->isVisibleAndActive(),
m_element.isSuspended(),
m_element.inActiveDocument(),
m_element.isFullscreen(),
m_element.muted(),
document.isMediaDocument() && (document.frame() && document.frame()->isMainFrame()),
isVideo,
isAudio,
m_element.hasVideo(),
m_element.hasAudio(),
m_element.hasRenderer(),
isAudio && hasBehaviorRestriction(RequireUserGestureToControlControlsManager) && !processingUserGesture,
m_element.hasAudio() && isPlaying && allowsPlaybackControlsForAutoplayingAudio(), // userHasPlayedAudioBefore
isElementRectMostlyInMainFrame(m_element),
!!playbackStateChangePermitted(MediaPlaybackState::Playing),
page->mediaPlaybackIsSuspended(),
document.isMediaDocument() && !document.ownerElement(),
pageExplicitlyAllowsElementToAutoplayInline(m_element),
requiresFullscreenForVideoPlayback() && !fullscreenPermitted(),
document.topDocument().hasHadUserInteraction() && document.quirks().shouldAutoplayForArbitraryUserGesture(),
isVideo && hasBehaviorRestriction(RequireUserGestureForVideoRateChange) && !processingUserGesture,
isAudio && hasBehaviorRestriction(RequireUserGestureForAudioRateChange) && !processingUserGesture && !m_element.muted() && m_element.volume(),
isVideo && hasBehaviorRestriction(RequireUserGestureForVideoDueToLowPowerMode) && !processingUserGesture,
!hasBehaviorRestriction(RequireUserGestureToControlControlsManager) || processingUserGesture,
hasBehaviorRestriction(RequirePlaybackToControlControlsManager) && !isPlaying,
m_element.hasEverNotifiedAboutPlaying(),
isOutsideOfFullscreen,
isLargeEnoughForMainContent(MediaSessionMainContentPurpose::MediaControls),
};
if (m_mediaUsageInfo && *m_mediaUsageInfo == usage)
return;
m_mediaUsageInfo = WTFMove(usage);
#if ENABLE(MEDIA_USAGE)
addMediaUsageManagerSessionIfNecessary();
page->chrome().client().updateMediaUsageManagerSessionState(mediaSessionIdentifier(), *m_mediaUsageInfo);
#endif
}
String convertEnumerationToString(const MediaPlaybackDenialReason enumerationValue)
{
static const NeverDestroyed<String> values[] = {
MAKE_STATIC_STRING_IMPL("UserGestureRequired"),
MAKE_STATIC_STRING_IMPL("FullscreenRequired"),
MAKE_STATIC_STRING_IMPL("PageConsentRequired"),
MAKE_STATIC_STRING_IMPL("InvalidState"),
};
static_assert(static_cast<size_t>(MediaPlaybackDenialReason::UserGestureRequired) == 0, "MediaPlaybackDenialReason::UserGestureRequired is not 0 as expected");
static_assert(static_cast<size_t>(MediaPlaybackDenialReason::FullscreenRequired) == 1, "MediaPlaybackDenialReason::FullscreenRequired is not 1 as expected");
static_assert(static_cast<size_t>(MediaPlaybackDenialReason::PageConsentRequired) == 2, "MediaPlaybackDenialReason::PageConsentRequired is not 2 as expected");
static_assert(static_cast<size_t>(MediaPlaybackDenialReason::InvalidState) == 3, "MediaPlaybackDenialReason::InvalidState is not 3 as expected");
ASSERT(static_cast<size_t>(enumerationValue) < WTF_ARRAY_LENGTH(values));
return values[static_cast<size_t>(enumerationValue)];
}
MediaSession* MediaElementSession::mediaSession() const
{
#if ENABLE(MEDIA_SESSION)
auto* window = m_element.document().domWindow();
if (!window)
return nullptr;
return &NavigatorMediaSession::mediaSession(window->navigator());
#else
return nullptr;
#endif
}
void MediaElementSession::ensureIsObservingMediaSession()
{
#if ENABLE(MEDIA_SESSION)
auto* session = mediaSession();
if (!session || m_observer)
return;
m_observer = makeUnique<MediaSessionObserver>(*this, *session);
#endif
}
void MediaElementSession::metadataChanged(const RefPtr<MediaMetadata>&)
{
clientCharacteristicsChanged();
}
void MediaElementSession::positionStateChanged(const std::optional<MediaPositionState>&) { }
void MediaElementSession::playbackStateChanged(MediaSessionPlaybackState) { }
void MediaElementSession::actionHandlersChanged() { }
}
#endif // ENABLE(VIDEO)