Since the echo detector processes both the render and the capture audio streams, it needs to know the sample rates and number of channels of both. Bug: webrtc:8732 Change-Id: Icd26e561d5dd98bd789a6dfa75f468f3fde06fee Reviewed-on: https://webrtc-review.googlesource.com/61861 Reviewed-by: Per Åhgren <peah@webrtc.org> Commit-Queue: Ivo Creusen <ivoc@webrtc.org> Cr-Commit-Position: refs/heads/master@{#22436}