commit 8fff1f065ea9d25970c3839294acdd606a5ddf22
author xians@webrtc.org <xians@webrtc.org@4adac7df-926f-26a2-2b94-8c16560cd09d> Wed Jul 31 16:27:42 2013
committer xians@webrtc.org <xians@webrtc.org@4adac7df-926f-26a2-2b94-8c16560cd09d> Wed Jul 31 16:27:42 2013
tree a2a2d3da51ee604628dce765b14638b59528b721
parent 2f84afad30b088ddebb4063bc47ac9a79d735a2b

Merge r4394 from stable to trunk.

r4326 was mistakenly committed to stable, so this is to re-merge back to trunk.

Fixed the AGC and interface problems on the new path.

In order to make the AGC work properly, we need to cache the volume value passed
by the callback, compare it with the value returned by
shared->transmit_mixer()->CaptureLevel(). If they are the same, we need to
return 0 to indicate no volume needs changing, otherwise return the new volume.
By doing this, we avoid setting the volume all the same, which allows the users
to change the volume manually.

This patch also fixes some minor issues with the interfaces too: make the int
channel[] const, and correct the order of the input params in
channel::Demultiplex.

R=tommi@webrtc.org

BUG=[2134]
TEST=compile && manual AGC test

Review URL: https://webrtc-codereview.appspot.com/1921004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@4450 4adac7df-926f-26a2-2b94-8c16560cd09d