commit e3a4da9f44242c8728892d8a92986679ddd0ad31
author Henrik Lundin <henrik.lundin@webrtc.org> Mon Nov 06 11:42:21 2017 +0100
committer Commit Bot <commit-bot@chromium.org> Mon Nov 06 14:16:06 2017 +0000
tree 7b15593c72fe1816baa30ad9f29dec890fbe4624
parent 149533abd48e5fcf719ecc50272c035489acebb4

AGC: Change default clipping level min to 70

The old value was 170, but experiments have shown that 70 is better.

This will let the AGC reduce the gain further when input clipping is
detected. The effect should be less clipping, but sometimes slightly
lower signals.

In Chrome, the value 70 has already been used since June (see
https://codereview.chromium.org/2928133002).

Bug: webrtc:6622, chromium:672476
Change-Id: Ie5a60bb875eef71f303b28e096b22a8cd4b449d4
Reviewed-on: https://webrtc-review.googlesource.com/20222
Reviewed-by: Per Åhgren <peah@webrtc.org>
Commit-Queue: Henrik Lundin <henrik.lundin@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#20563}

modules/audio_processing/include/audio_processing.h

diff --git a/modules/audio_processing/include/audio_processing.h b/modules/audio_processing/include/audio_processing.h
index dc6d9a1..f3dc75b 100644
--- a/modules/audio_processing/include/audio_processing.h
+++ b/modules/audio_processing/include/audio_processing.h
@@ -110,7 +110,7 @@
 #else
 static const int kAgcStartupMinVolume = 0;
 #endif  // defined(WEBRTC_CHROMIUM_BUILD)
-static constexpr int kClippedLevelMin = 170;
+static constexpr int kClippedLevelMin = 70;
 struct ExperimentalAgc {
   ExperimentalAgc() = default;
   explicit ExperimentalAgc(bool enabled) : enabled(enabled) {}