Seeking video doesn't update seek position
https://bugs.webkit.org/show_bug.cgi?id=162575
<rdar://problem/28457219>
Reviewed by Jer Noble.
On ToT, seeking in a video causes the playhead to stutter, and does not actually update media remote's seek
position. This is partly due to how we do not update media remote with new information when beginning to respond
to remote seek commands, so media remote continues to think that a playing video is still playing despite the
user attempting to seek through it.
To fix this, we introduce timer-based guards around remote seek commands, such that a seek "gesture" begins when
we receive the first seek command and ends when no seek command has been received in a set amount of time (this
is 0.5 seconds, which is approximately what other clients around the platform use).
Also, when responding to a remote seek, perform the seek with no tolerance. This prevents the playhead from
stuttering at the end of a seek from the final requested destination of the seek to the last actually seeked
time in the video.
When beginning to seek, we must pause the media. Through existing mechanisms, this causes the media session
manager to update its Now Playing information, which informs media remote that we are no longer playing and
prevents us from stuttering. However, when ending a seek, we must also trigger an additional update to again
refresh media remote's view of the current time. This prevents a flicker when playing media after seeking.
Unit tests to be added in a follow-up due to time constraints.
* html/HTMLMediaElement.cpp:
(WebCore::HTMLMediaElement::HTMLMediaElement):
(WebCore::HTMLMediaElement::handleSeekToPlaybackPosition):
(WebCore::HTMLMediaElement::seekToPlaybackPositionEndedTimerFired):
(WebCore::HTMLMediaElement::didReceiveRemoteControlCommand):
* html/HTMLMediaElement.h:
* platform/audio/PlatformMediaSessionManager.h:
(WebCore::PlatformMediaSessionManager::scheduleUpdateNowPlayingInfo):
(WebCore::PlatformMediaSessionManager::sessionDidEndRemoteScrubbing):
(WebCore::PlatformMediaSessionManager::sessions): Deleted.
* platform/audio/mac/MediaSessionManagerMac.h:
* platform/audio/mac/MediaSessionManagerMac.mm:
(WebCore::PlatformMediaSessionManager::updateNowPlayingInfoIfNecessary):
(WebCore::MediaSessionManagerMac::scheduleUpdateNowPlayingInfo):
(WebCore::MediaSessionManagerMac::sessionDidEndRemoteScrubbing):
(WebCore::MediaSessionManagerMac::updateNowPlayingInfo):
git-svn-id: http://svn.webkit.org/repository/webkit/trunk@206399 268f45cc-cd09-0410-ab3c-d52691b4dbfc
6 files changed
