0bd0a3fe4c
This CL adds helper functions to be used for the spectral features computation. Namely, it includes the following: - band boundaries (frequency to FFT coeffcient index) - band energy coefficients - log band energy coefficients - fixed size DCT table and computation Bug: webrtc:9076 Change-Id: I03a8799b226d986bc1e37cefd0c3039f94b5592a Reviewed-on: https://webrtc-review.googlesource.com/73687 Reviewed-by: Alex Loiko <aleloi@webrtc.org> Reviewed-by: Minyue Li <minyue@webrtc.org> Commit-Queue: Alessio Bazzica <alessiob@webrtc.org> Cr-Commit-Position: refs/heads/master@{#23170}