Let Opus increase complexity for low bitrates

webrtc/modules/audio_coding/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/webrtc.gni")
 import("audio_coding.gni")
@@ skipping 693 matching lines @@
     "codecs/opus/opus_interface.h",
   ]
 
   deps = [
     ":audio_decoder_interface",
     ":audio_encoder_interface",
     ":audio_network_adaptor",
     "../../base:rtc_base_approved",
   ]
 
+  defines = []
+
   if (rtc_build_opus) {
     public_deps = [
       rtc_opus_dir,
     ]
+    if (rtc_opus_variable_complexity) {
+      defines += [ "WEBRTC_OPUS_VARIABLE_COMPLEXITY=1" ]
+    } else {
+      defines += [ "WEBRTC_OPUS_VARIABLE_COMPLEXITY=0" ]
+    }
   } else if (build_with_mozilla) {
     include_dirs = [ getenv("DIST") + "/include/opus" ]
   }
 }
 
 if (rtc_enable_protobuf) {
   proto_library("ana_debug_dump_proto") {
     sources = [
       "audio_network_adaptor/debug_dump.proto",
     ]
@@ skipping 948 matching lines @@
       "../../test:test_support_main",
       "//testing/gtest",
     ]
 
     if (!build_with_chromium && is_clang) {
       # Suppress warnings from the Chromium Clang plugin (bugs.webrtc.org/163).
       suppressed_configs += [ "//build/config/clang:find_bad_constructs" ]
     }
   }
 }