Attempt decoder fallback when the first decode call fails.

Attempt decoder fallback when the first decode call fails.

There are several instances where a GPU video decoder will fail on
the first decode even though it reported successfull initialization.
In these cases try to fallback to a software decoder if possible.

This works by queuing the first buffers sent to Decode() before any
output callbacks have occurred. If decode fails before output is
received it will attempt to reselect a decoder. If this is successful
the pending decoders will be fed in at an appropriate rate to the new
decoder.

Pending decode callbacks from the previous decoder are invalidated by
way of a sequence token.

BUG=???
TEST=manual...

[DaleCurtis, 2016-02-23 04:17:21]

dalecurtis@chromium.org changed reviewers:
+ sandersd@chromium.org

[DaleCurtis, 2016-02-23 04:17:22]

Needs a test and existing tests to be fixed, but otherwise works. Do we have
pressing issues that would make this nice to do? Or is it Pri-3, when time
permits?

[DaleCurtis, 2016-03-14 23:21:05]

Just realized this should also let us set 4k+ decode limits on our hardware
decoders and fallback if they don't succeed during the configuration or first
decode.

[DaleCurtis, 2016-03-14 23:21:24]

dalecurtis@chromium.org changed reviewers:
+ tguilbert@chromium.org

[DaleCurtis, 2016-03-14 23:21:25]

cc:tguilbert who was going to look into this as FYI.

[sandersd (OOO until July 31), 2016-06-09 22:56:12]

Description was changed from

==========
Attempt decoder fallback when the first decode call fails.

There are several instances where a GPU video decoder will fail on
the first decode even though it reported successfull initialization.
In these cases try to fallback to a software decoder if possible.

This works by queuing the first buffers sent to Decode() before any
output callbacks have occurred. If decode fails before output is
received it will attempt to reselect a decoder. If this is successful
the pending decoders will be fed in at an appropriate rate to the new
decoder.

Pending decode callbacks from the previous decoder are invalidated by
way of a sequence token.

BUG=???
TEST=manual...
==========

to

==========
Attempt decoder fallback when the first decode call fails.

There are several instances where a GPU video decoder will fail on
the first decode even though it reported successfull initialization.
In these cases try to fallback to a software decoder if possible.

This works by queuing the first buffers sent to Decode() before any
output callbacks have occurred. If decode fails before output is
received it will attempt to reselect a decoder. If this is successful
the pending decoders will be fed in at an appropriate rate to the new
decoder.

Pending decode callbacks from the previous decoder are invalidated by
way of a sequence token.

BUG=???
TEST=manual...
==========

[sandersd (OOO until July 31), 2016-06-09 22:56:12]

sandersd@chromium.org changed reviewers:
- sandersd@chromium.org