b86fbaf1d4
Replace the BlockSize() workaround we were using previously to support the push wrapper with the upstream request_frames interface. This requires a bit of a trick to ensure we don't add more delay than necessary. On the first pass we use a dummy Resample() call in order to prime the buffer such that all later calls only require a single input request through Run(). Notably, this brings in an optimized loop condition, improving performance by ~2% - 3% on tested platforms and avoids a 20% performance hit with clang. This addresses issue2041. Only negligible changes to the PushSincResamplerTest SNR thresholds, due to a fractional sample adjustment in output delay. This still retains the per-instance CPU detection, as webrtc lacks a LazyInstance helper for static initialization. Ideally, we would adopt SetRatio() in PushSincResampler's InitializeIfNeeded() for on-the-fly changes, but this will require a way to update request_frames. The diff against Chromium upstream is available here: https://codereview.chromium.org/19470003 BUG=2041 TESTED=unit tests, voe_cmd_test in loopback running through all codecs with 44.1 kHz and 48 kHz device formats using a stereo mic. R=dalecurtis@chromium.org Review URL: https://webrtc-codereview.appspot.com/1838004 git-svn-id: http://webrtc.googlecode.com/svn/trunk@4406 4adac7df-926f-26a2-2b94-8c16560cd09d