commit a421ddd60eb15a19b675ceaa4e241bd15cc86f8e
author peah <peah@webrtc.org> Mon Sep 12 18:27:14 2016
committer Commit bot <commit-bot@chromium.org> Mon Sep 12 18:27:20 2016
tree da7f444afba9641271147e41623008eb12339dd8
parent b3f7876a95d266db68011e47994772a95d6ac97c

The buffering of the farend signal is refactored in this CL.

The former buffering scheme was overly complicated and
complex as.
-It buffered twice as many data points as needed.
-It used the ring_buffer C functionality directly inside the
 delay adjustment functionality which makes that
functionality very hard to read.

In order to overcome these problems this CL does
-Change the buffering to buffer only the amount of samples
 needed.
-Wrap the ring_buffer C functionality in a wrapper class
 with methods that are more descriptive in what they do
 to affect the AEC delay.

Additional notes:
-Some minor other name changes/code changes were also
 introduced.
-The ringbuffer C functionality should be removed, but now
 is not the time to do it as the rest of the code is very
 adapted to the wrapping behavior of the ringbuffer. It is
 better to simplify the surrounding code before doing that.

The changes have been tested to be bitexact.

This CL is chained to the CL https://codereview.webrtc.org/2321483002/
and will be followed by another CL.

BUG=webrtc:5298, webrtc:6018

Review-Url: https://codereview.webrtc.org/2319693003
Cr-Commit-Position: refs/heads/master@{#14188}