Adds low complexity audio mode for single core CPUs

Adds low complexity audio mode for single core CPUs

BUG=webrtc:5538
R=tkchin@webrtc.org

Committed: https://crrev.com/3e60bf0ff3b0cb1d5a5418f41218fd86c462e420
Cr-Commit-Position: refs/heads/master@{#11743}

[henrika_webrtc, 2016-02-23 15:05:12]

Description was changed from

==========
Adds low complexity audio mode for single core CPUs

BUG=
==========

to

==========
Adds low complexity audio mode for single core CPUs

BUG=webrtc:5538
==========

[henrika_webrtc, 2016-02-23 15:05:12]

henrika@webrtc.org changed reviewers:
+ tkchin@webrtc.org

[henrika_webrtc, 2016-02-23 15:09:04]

Zeke, please read the bug description for a background description.
In short, we now use an alternative set of parameters (I/O buffer size and
sample rate) if a single-core CPU is detected. It will reduce the CPU load
substantially and allow usage of devices like iPhone 4.

I also added some extra features and improvements while I was making these
changes.

[tkchin_webrtc, 2016-02-23 17:39:27]

lgtm % latest comment from silviu

https://codereview.webrtc.org/1723163002/diff/1/webrtc/modules/utility/source...
File webrtc/modules/utility/source/helpers_ios.mm (right):

https://codereview.webrtc.org/1723163002/diff/1/webrtc/modules/utility/source...
webrtc/modules/utility/source/helpers_ios.mm:154: NSString* processName =
[NSProcessInfo processInfo].processName;
The conversion to std::string seems unneeded because we're just printing a bunch
of these functions.
Also this file's methods feel like they should be moved to webrtc/base/objc
instead.

However, I think it's okay to consolidate that later and just address the
preferred rates change now as-is. Can you file a bug to track that work though?
(Consolidate helpers_ios into webrtc/base/objc, allow modules/audio_device/ios
to depend on webrtc/base/objc).

[henrika_webrtc, 2016-02-24 11:52:48]

https://codereview.webrtc.org/1723163002/diff/1/webrtc/modules/utility/source...
File webrtc/modules/utility/source/helpers_ios.mm (right):

https://codereview.webrtc.org/1723163002/diff/1/webrtc/modules/utility/source...
webrtc/modules/utility/source/helpers_ios.mm:154: NSString* processName =
[NSProcessInfo processInfo].processName;
Filed https://bugs.chromium.org/p/webrtc/issues/detail?id=5582.

[henrika_webrtc, 2016-02-24 12:24:19]

Landing as is since I am unable to reproduce the final issue mentioned by
Silviu. Will add more comments in the webrtc:5538 bug.

[henrika_webrtc, 2016-02-24 12:24:40]

The CQ bit was checked by henrika@webrtc.org

[commit-bot: I haz the power, 2016-02-24 12:24:54]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1723163002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1723163002/1

[henrika_webrtc, 2016-02-24 13:27:27]

Description was changed from

==========
Adds low complexity audio mode for single core CPUs

BUG=webrtc:5538
==========

to

==========
Adds low complexity audio mode for single core CPUs

BUG=webrtc:5538
R=tkchin@webrtc.org

Committed:
https://chromium.googlesource.com/external/webrtc/+/3e60bf0ff3b0cb1d5a5418f41...
==========

[henrika_webrtc, 2016-02-24 13:27:28]

Committed patchset #1 (id:1) manually as
3e60bf0ff3b0cb1d5a5418f41218fd86c462e420 (presubmit successful).

[commit-bot: I haz the power, 2016-02-24 13:27:28]

Description was changed from

==========
Adds low complexity audio mode for single core CPUs

BUG=webrtc:5538
R=tkchin@webrtc.org

Committed:
https://chromium.googlesource.com/external/webrtc/+/3e60bf0ff3b0cb1d5a5418f41...
==========

to

==========
Adds low complexity audio mode for single core CPUs

BUG=webrtc:5538
R=tkchin@webrtc.org

Committed: https://crrev.com/3e60bf0ff3b0cb1d5a5418f41218fd86c462e420
Cr-Commit-Position: refs/heads/master@{#11743}
==========

[commit-bot: I haz the power, 2016-02-24 13:27:29]

Patchset 1 (id:??) landed as
https://crrev.com/3e60bf0ff3b0cb1d5a5418f41218fd86c462e420
Cr-Commit-Position: refs/heads/master@{#11743}