Some of the VoE interfaces are removed in webrtc.org branch 61 which requires changes to the audio processing APIs used in MediaEngineWebrtc. This work can be done against branch 57 of webrtc.org, which is likely easier than trying to make the changes as part of the branch 61 update.

This is the first step of the plan, see 1391258 for the other part of the plan. Here, we're simply substituting the old interface that work by inheritance for an interface that works by composition. We want to use the Audio Processing Module (APM) of webrtc.org [0]. The following needs to be done: - [2] will replace our lock-free queue/AudioOutputObserver thing. We have the output data in [2] (graph thread) - [3] is the location where we need to process the input data with the AEC and other processing algorithms, this is also on the graph thread. [4] is the method to use here. It's synchronous and we can call `InsertInGraph` or equivalent code after processing. - [5] and [6] need to be adjusted to use the new `Config` objects. - I have no idea on what to do with [7], it does not belong here. [0]: http://searchfox.org/mozilla-central/source/media/webrtc/trunk/webrtc/modules/audio_processing/include/audio_processing.h#161 [1]: http://searchfox.org/mozilla-central/source/media/webrtc/trunk/webrtc/modules/audio_processing/include/audio_processing.h#418 [2]: http://searchfox.org/mozilla-central/source/dom/media/webrtc/MediaEngineWebRTCAudio.cpp#573 [3]: http://searchfox.org/mozilla-central/source/dom/media/webrtc/MediaEngineWebRTCAudio.cpp#690 [4]: http://searchfox.org/mozilla-central/source/media/webrtc/trunk/webrtc/modules/audio_processing/include/audio_processing.h#389 [5]: http://searchfox.org/mozilla-central/source/dom/media/webrtc/MediaEngineWebRTCAudio.cpp#736 [6]: http://searchfox.org/mozilla-central/source/dom/media/webrtc/MediaEngineWebRTCAudio.cpp#375 [7]: http://searchfox.org/mozilla-central/source/dom/media/webrtc/MediaEngineWebRTCAudio.cpp#830

Resolving this as a duplicate of jesup's bug.