commit a049d6ebe5dacfef278c0d9086d1522854c56b39
author tina.legrand@webrtc.org <tina.legrand@webrtc.org@4adac7df-926f-26a2-2b94-8c16560cd09d> Thu Nov 15 08:34:38 2012 +0000
committer tina.legrand@webrtc.org <tina.legrand@webrtc.org@4adac7df-926f-26a2-2b94-8c16560cd09d> Thu Nov 15 08:34:38 2012 +0000
tree aaedc0884c64df9c09a0a7d0c238271bd520e9a0
parent d75680a372c87ad97394a15f49340109c6f2d3ed

Wraparound distortion in Opus

This CL solves the wraparound distortion in Opus.

In the Opus decoder-wrapper we are downsampling the signal from 48 kHz to 32 kHz. This is done in two steps, using the following functions from the signal processing library:
WebRtcSpl_Resample48khzTo32khz() and WebRtcSpl_VectorBitShiftW32ToW16

The latter does not have a saturation check, and the signal can suffer from wraparound. I've added saturation control to the function.

BUG=issue1089

Review URL: https://webrtc-codereview.appspot.com/967004

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@3103 4adac7df-926f-26a2-2b94-8c16560cd09d