Bug 175167 – Change fast seek logic to prevent ping-ponging.

• Component: Media
• Status: RESOLVED FIXED

[Jeremy Jones]

Change fast seek logic to prevent ping-ponging.

[Jeremy Jones]

rdar://problem/32936116

[Jeremy Jones]

Created attachment 317192 [details]
Test Only

[Jeremy Jones]

Created attachment 317194 [details]
Patch

[Build Bot]

Comment on attachment 317194 [details]
Patch

Attachment 317194 [details] did not pass mac-wk2-ews (mac-wk2):
Output: http://webkit-queues.webkit.org/results/4249998

New failing tests:
media/media-source/media-source-fastseek.html

[Build Bot]

Created attachment 317197 [details]
Archive of layout-test-results from ews106 for mac-elcapitan-wk2

The attached test failures were seen while running run-webkit-tests on the mac-wk2-ews.
Bot: ews106  Port: mac-elcapitan-wk2  Platform: Mac OS X 10.11.6

[Build Bot]

Comment on attachment 317192 [details]
Test Only

Attachment 317192 [details] did not pass mac-ews (mac):
Output: http://webkit-queues.webkit.org/results/4250021

New failing tests:
media/video-fast-seek.html

[Build Bot]

Created attachment 317199 [details]
Archive of layout-test-results from ews100 for mac-elcapitan

The attached test failures were seen while running run-webkit-tests on the mac-ews.
Bot: ews100  Port: mac-elcapitan  Platform: Mac OS X 10.11.6

[Build Bot]

Comment on attachment 317192 [details]
Test Only

Attachment 317192 [details] did not pass mac-wk2-ews (mac-wk2):
Output: http://webkit-queues.webkit.org/results/4250023

New failing tests:
media/video-fast-seek.html

[Build Bot]

Created attachment 317200 [details]
Archive of layout-test-results from ews105 for mac-elcapitan-wk2

The attached test failures were seen while running run-webkit-tests on the mac-wk2-ews.
Bot: ews105  Port: mac-elcapitan-wk2  Platform: Mac OS X 10.11.6

[Build Bot]

Comment on attachment 317194 [details]
Patch

Attachment 317194 [details] did not pass mac-ews (mac):
Output: http://webkit-queues.webkit.org/results/4250055

New failing tests:
media/media-source/media-source-fastseek.html

[Build Bot]

Created attachment 317202 [details]
Archive of layout-test-results from ews101 for mac-elcapitan

The attached test failures were seen while running run-webkit-tests on the mac-ews.
Bot: ews101  Port: mac-elcapitan  Platform: Mac OS X 10.11.6

[Build Bot]

Comment on attachment 317194 [details]
Patch

Attachment 317194 [details] did not pass mac-debug-ews (mac):
Output: http://webkit-queues.webkit.org/results/4250038

New failing tests:
media/media-source/media-source-fastseek.html

[Build Bot]

Created attachment 317206 [details]
Archive of layout-test-results from ews115 for mac-elcapitan

The attached test failures were seen while running run-webkit-tests on the mac-debug-ews.
Bot: ews115  Port: mac-elcapitan  Platform: Mac OS X 10.11.6

[Build Bot]

Comment on attachment 317192 [details]
Test Only

Attachment 317192 [details] did not pass mac-debug-ews (mac):
Output: http://webkit-queues.webkit.org/results/4250048

New failing tests:
media/video-fast-seek.html

[Build Bot]

Created attachment 317207 [details]
Archive of layout-test-results from ews113 for mac-elcapitan

The attached test failures were seen while running run-webkit-tests on the mac-debug-ews.
Bot: ews113  Port: mac-elcapitan  Platform: Mac OS X 10.11.6

[Build Bot]

Comment on attachment 317192 [details]
Test Only

Attachment 317192 [details] did not pass ios-sim-ews (ios-simulator-wk2):
Output: http://webkit-queues.webkit.org/results/4250053

New failing tests:
media/video-fast-seek.html

[Build Bot]

Created attachment 317208 [details]
Archive of layout-test-results from ews123 for ios-simulator-wk2

The attached test failures were seen while running run-webkit-tests on the ios-sim-ews.
Bot: ews123  Port: ios-simulator-wk2  Platform: Mac OS X 10.12.5

[Jer Noble]

FWIW, this doesn't match the behavior of Firefox (which, AFAICT, is the only other browser to implement fastSeek()).  Given a .ogg file which has a keyframe at 2.533s:

> $0.currentTime = 0
< 0
> $0.fastSeek(2.5)
< undefined
> $0.currentTime
< 0
> $0.fastSeek(2.6)
< undefined
> $0.currentTime
< 2.566667
> $0.fastSeek(2.5)
< undefined
> $0.currentTime
> 0

Looks like they just seek to the previous I-frame from the target time, with a min(0) when seeking backward and min(currentTime) when seeking forward.

[Jeremy Jones]

(In reply to Jer Noble from comment #18)
> FWIW, this doesn't match the behavior of Firefox (which, AFAICT, is the only
> other browser to implement fastSeek()).  Given a .ogg file which has a
> keyframe at 2.533s:
> 
> > $0.currentTime = 0
> < 0
> > $0.fastSeek(2.5)
> < undefined
> > $0.currentTime
> < 0
> > $0.fastSeek(2.6)
> < undefined
> > $0.currentTime
> < 2.566667
> > $0.fastSeek(2.5)
> < undefined
> > $0.currentTime
> > 0
> 
> Looks like they just seek to the previous I-frame from the target time, with
> a min(0) when seeking backward and min(currentTime) when seeking forward.

This also solves the problem of switching directions for the I-frame search, but has the advantage that is is much more likely to find an I-frame, especially in the more difficult seek task of seeking backwards.

[Jeremy Jones]

Created attachment 317470 [details]
Patch

[Build Bot]

Comment on attachment 317470 [details]
Patch

Attachment 317470 [details] did not pass mac-ews (mac):
Output: http://webkit-queues.webkit.org/results/4272661

New failing tests:
media/media-source/media-source-fastseek.html

[Build Bot]

Created attachment 317494 [details]
Archive of layout-test-results from ews101 for mac-elcapitan

The attached test failures were seen while running run-webkit-tests on the mac-ews.
Bot: ews101  Port: mac-elcapitan  Platform: Mac OS X 10.11.6

[Build Bot]

Comment on attachment 317470 [details]
Patch

Attachment 317470 [details] did not pass mac-debug-ews (mac):
Output: http://webkit-queues.webkit.org/results/4272506

New failing tests:
media/media-source/media-source-fastseek.html

[Build Bot]

Created attachment 317496 [details]
Archive of layout-test-results from ews114 for mac-elcapitan

The attached test failures were seen while running run-webkit-tests on the mac-debug-ews.
Bot: ews114  Port: mac-elcapitan  Platform: Mac OS X 10.11.6

[Build Bot]

Comment on attachment 317470 [details]
Patch

Attachment 317470 [details] did not pass mac-wk2-ews (mac-wk2):
Output: http://webkit-queues.webkit.org/results/4272801

New failing tests:
media/media-source/media-source-fastseek.html

[Build Bot]

Created attachment 317508 [details]
Archive of layout-test-results from ews104 for mac-elcapitan-wk2

The attached test failures were seen while running run-webkit-tests on the mac-wk2-ews.
Bot: ews104  Port: mac-elcapitan-wk2  Platform: Mac OS X 10.11.6

[Jeremy Jones]

Created attachment 317511 [details]
Patch

[Jeremy Jones]

Created attachment 317514 [details]
Patch for landing.

[WebKit Commit Bot]

Comment on attachment 317514 [details]
Patch for landing.

Clearing flags on attachment: 317514

Committed r220414: <http://trac.webkit.org/changeset/220414>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.