[Bug 767800] Introduce a WebRTC Audio Processing based echo canceller for GStreamer

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=767800

--- Comment #1 from Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> ---
Created attachment 329973
  --> https://bugzilla.gnome.org/attachment.cgi?id=329973&action=edit
webrtcdsp: Add WebRTC Audio Processing support

This DSP library can be used to enhance voice signal for real time
communication call. In implements multiple filters like noise reduction,
high pass filter, echo cancellation, automatic gain control, etc.

The webrtcdsp element can be used along, or with the help of the
webrtcechoprobe if echo cancellation is enabled. The echo probe should
be placed as close as possible to the audio sink, while the DSP is
generally place close to the audio capture. For local testing, one can
use an echo loop pipeline like the following:

  autoaudiosrc ! webrtcdsp ! webrtcechoprobe ! autoaudiosink

This pipeline should produce a single echo rather then repeated echo.
Those elements works if they are placed in the same top level pipeline.

TODO:
* Document the elements
* Add missing controls:
  - Echo Suppression level
  - Noise Suppression level

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