Alex Loiko 7cfbf3a0ff Make energy calculation in AGC not overflow. ... An energy value is calculated by summing squares of processed audio samples. The expression 'out*out >> 6' could overflow. In this CL we change it to 'out*(out>>6) + out*(out*(out%(1<<6))>>6)'. The which is verified and proven to be equal, but doesn't overflow. The change also passes our change-detection tests in GainControlBitExactnessTest.* We verified with Godbolt that the modulo and divisions are converted into branch-free bitwise operations. NOTRY=True # changing comment, tests just passed. Bug: chromium:780638, chromium:780376 Change-Id: I415535193433a2fbc275c643fb4e4026ba3e0bdd Reviewed-on: https://webrtc-review.googlesource.com/20867 Commit-Queue: Alex Loiko <aleloi@webrtc.org> Reviewed-by: Sam Zackrisson <saza@webrtc.org> Cr-Commit-Position: refs/heads/master@{#20589}		2017-11-07 15:37:55 +00:00
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analog_agc.c	Fixing WebRTC after moving from src/webrtc to src/	2017-09-15 05:02:56 +00:00
analog_agc.h	Adding NOLINT for typedefs.h and common_types.h	2017-09-15 13:03:51 +00:00
digital_agc.c	Make energy calculation in AGC not overflow.	2017-11-07 15:37:55 +00:00
digital_agc.h	Adding NOLINT for typedefs.h and common_types.h	2017-09-15 13:03:51 +00:00
gain_control.h	Adding NOLINT for typedefs.h and common_types.h	2017-09-15 13:03:51 +00:00