AGC2 as a new APM sub-module operating with hard-coded gain.

webrtc/modules/audio_processing/BUILD.gn

 # Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 import("//build/config/arm.gni")
 import("//third_party/protobuf/proto_library.gni")
@@ skipping 90 matching lines @@
     "aecm/echo_control_mobile.h",
     "agc/agc.cc",
     "agc/agc.h",
     "agc/agc_manager_direct.cc",
     "agc/agc_manager_direct.h",
     "agc/gain_map_internal.h",
     "agc/loudness_histogram.cc",
     "agc/loudness_histogram.h",
     "agc/utility.cc",
     "agc/utility.h",
+    "agc2/digital_gain_applier.cc",
+    "agc2/digital_gain_applier.h",
+    "agc2/gain_controller2.cc",
+    "agc2/gain_controller2.h",
     "audio_buffer.cc",
     "audio_buffer.h",
     "audio_processing_impl.cc",
     "audio_processing_impl.h",
     "beamformer/array_util.cc",
     "beamformer/array_util.h",
     "beamformer/complex_matrix.h",
     "beamformer/covariance_matrix_generator.cc",
     "beamformer/covariance_matrix_generator.h",
     "beamformer/matrix.h",
@@ skipping 484 matching lines @@
         "aec3/render_delay_buffer_unittest.cc",
         "aec3/render_delay_controller_metrics_unittest.cc",
         "aec3/render_delay_controller_unittest.cc",
         "aec3/render_signal_analyzer_unittest.cc",
         "aec3/residual_echo_estimator_unittest.cc",
         "aec3/shadow_filter_update_gain_unittest.cc",
         "aec3/subtractor_unittest.cc",
         "aec3/suppression_filter_unittest.cc",
         "aec3/suppression_gain_unittest.cc",
         "aec3/vector_math_unittest.cc",
+        "agc2/gain_controller2_unittest.cc",
         "audio_processing_impl_locking_unittest.cc",
         "audio_processing_impl_unittest.cc",
         "audio_processing_unittest.cc",
         "beamformer/nonlinear_beamformer_unittest.cc",
         "echo_cancellation_bit_exact_unittest.cc",
         "echo_control_mobile_unittest.cc",
         "echo_detector/circular_buffer_unittest.cc",
         "echo_detector/mean_variance_estimator_unittest.cc",
         "echo_detector/moving_max_unittest.cc",
         "echo_detector/normalized_covariance_estimator_unittest.cc",
@@ skipping 216 matching lines @@
 
       deps = [
         ":audioproc_debug_proto",
         "../..:webrtc_common",
         "../../base:protobuf_utils",
         "../../base:rtc_base_approved",
       ]
     }
   }
 }