Increase bitrate adjustment values for VP8 Exynos encoder

Increase bitrate adjustment values for VP8 Exynos encoder

For low bitrates actual encoder output bitrate may differ from target
by 3-4 times.
Also adjust adaptation speed based on bitrate variation from the target.

BUG=b/34233384
R=wzh@webrtc.org

Review-Url: https://codereview.webrtc.org/2640543003 .
Cr-Commit-Position: refs/heads/master@{#16128}
Committed: https://chromium.googlesource.com/external/webrtc/+/7fa4a729245a401209310400e7a4df4e416e96a2

[AlexG, 2017-01-17 22:50:21]

glaznev@webrtc.org changed reviewers:
+ wzh@webrtc.org

[AlexG, 2017-01-17 22:50:21]

PTAL

[wzh, 2017-01-17 22:54:19]

lgtm

https://codereview.webrtc.org/2640543003/diff/1/webrtc/sdk/android/api/org/we...
File webrtc/sdk/android/api/org/webrtc/MediaCodecVideoEncoder.java (right):

https://codereview.webrtc.org/2640543003/diff/1/webrtc/sdk/android/api/org/we...
webrtc/sdk/android/api/org/webrtc/MediaCodecVideoEncoder.java:756: int
bitrateAdjustmentInc = (int) (bitrateAccumulator / bitrateAccumulatorMax + 0.6);
pls add a comment for '0.6'.

[AlexG, 2017-01-17 23:08:34]

On 2017/01/17 22:54:19, wzh wrote:
> lgtm
> 
>
https://codereview.webrtc.org/2640543003/diff/1/webrtc/sdk/android/api/org/we...
> File webrtc/sdk/android/api/org/webrtc/MediaCodecVideoEncoder.java (right):
> 
>
https://codereview.webrtc.org/2640543003/diff/1/webrtc/sdk/android/api/org/we...
> webrtc/sdk/android/api/org/webrtc/MediaCodecVideoEncoder.java:756: int
> bitrateAdjustmentInc = (int) (bitrateAccumulator / bitrateAccumulatorMax +
0.6);
> pls add a comment for '0.6'.

Reverted to 0.5 to avoid confusion

[AlexG, 2017-01-17 23:08:59]

The CQ bit was checked by glaznev@webrtc.org

[AlexG, 2017-01-17 23:09:00]

The patchset sent to the CQ was uploaded after l-g-t-m from wzh@webrtc.org
Link to the patchset: https://codereview.webrtc.org/2640543003/#ps20001 (title:
"Address comment")

[commit-bot: I haz the power, 2017-01-17 23:09:04]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.webrtc.org/...

[AlexG, 2017-01-17 23:32:07]

Description was changed from

==========
Increase bitrate adjustment values for VP8 Exynos encoder

For low bitrates actual encoder output bitrate may differ from target
by 3-4 times.
Also adjust adaptation speed based on bitrate variation from the target.

BUG=b/34233384
==========

to

==========
Increase bitrate adjustment values for VP8 Exynos encoder

For low bitrates actual encoder output bitrate may differ from target
by 3-4 times.
Also adjust adaptation speed based on bitrate variation from the target.

BUG=b/34233384
R=wzh@webrtc.org

Review-Url: https://codereview.webrtc.org/2640543003 .
Cr-Commit-Position: refs/heads/master@{#16128}
Committed:
https://chromium.googlesource.com/external/webrtc/+/7fa4a729245a401209310400e...
==========

[AlexG, 2017-01-17 23:32:08]

Committed patchset #2 (id:20001) manually as
7fa4a729245a401209310400e7a4df4e416e96a2 (presubmit successful).