commit 6799553a2cbe2470115a7db01ed14f4a4c593d88
author peah <peah@webrtc.org> Mon Apr 10 14:12:41 2017 -0700
committer Commit bot <commit-bot@chromium.org> Mon Apr 10 21:12:41 2017 +0000
tree 56ef69ed0e0de208a18b0974eddf1cea104f22ea
parent 6d822adac4439258b0a07c5458620fcf2314874f

Add information about microphone gain changes to AEC3

Changes in the microphone gain are effecting the AEC in the sense
that each change in the microphone gain is a change in the echo
path seen by the AEC. This CL utilizes the ability of AEC3 to
leverage information about known changes in the analog microphone
gain.

BUG=webrtc:6018

Review-Url: https://codereview.webrtc.org/2808073002
Cr-Commit-Position: refs/heads/master@{#17625}

webrtc/modules/audio_processing/audio_processing_impl.cc

diff --git a/webrtc/modules/audio_processing/audio_processing_impl.cc b/webrtc/modules/audio_processing/audio_processing_impl.cc
index 636d6ca..af5e94b 100644
--- a/webrtc/modules/audio_processing/audio_processing_impl.cc
+++ b/webrtc/modules/audio_processing/audio_processing_impl.cc
@@ -1145,6 +1145,10 @@
   }
 
   if (private_submodules_->echo_canceller3) {
+    const int new_agc_level = gain_control()->stream_analog_level();
+    capture_.echo_path_gain_change =
+        (capture_.previous_agc_level != new_agc_level);
+    capture_.previous_agc_level = new_agc_level;
     private_submodules_->echo_canceller3->AnalyzeCapture(capture_buffer);
   }
 
@@ -1193,7 +1197,8 @@
   }
 
   if (private_submodules_->echo_canceller3) {
-    private_submodules_->echo_canceller3->ProcessCapture(capture_buffer, false);
+    private_submodules_->echo_canceller3->ProcessCapture(
+        capture_buffer, capture_.echo_path_gain_change);
   } else {
     RETURN_ON_ERR(public_submodules_->echo_cancellation->ProcessCaptureAudio(
         capture_buffer, stream_delay_ms()));
@@ -1993,7 +1998,9 @@
       array_geometry(array_geometry),
       target_direction(target_direction),
       capture_processing_format(kSampleRate16kHz),
-      split_rate(kSampleRate16kHz) {}
+      split_rate(kSampleRate16kHz),
+      previous_agc_level(0),
+      echo_path_gain_change(false) {}
 
 AudioProcessingImpl::ApmCaptureState::~ApmCaptureState() = default;