86d907cffd
This CL contains major modifications of the audio output parts for WebRTC on iOS: - general code cleanup - improves thread handling (added thread checks, remove critical section, atomic ops etc.) - reduces loopback latency of iPhone 6 from ~90ms to ~60ms ;-) - improves selection of audio parameters on iOS - reduces complexity by removing complex and redundant delay estimates - now instead uses fixed delay estimates if for some reason the SW EAC must be used - adds AudioFineBuffer to compensate for differences in native output buffer size and the 10ms size used by WebRTC. Same class as is used today on Android and we have unit tests for this class (the old code was buggy and we have several issue reports of crashes related to it) Similar improvements will be done for the recording sid as well in a separate CL. I will also add support for 48kHz in an upcoming CL since that will improve Opus performance. BUG=webrtc:4796,webrtc:4817,webrtc:4954, webrtc:4212 TEST=AppRTC demo and iOS modules_unittests using --gtest_filter=AudioDevice* R=pbos@webrtc.org, tkchin@webrtc.org Review URL: https://codereview.webrtc.org/1254883002 . Cr-Commit-Position: refs/heads/master@{#9875}