Deactivated the intelligibility enhancement functionality by default

webrtc/modules/audio_processing/audio_processing.gypi

 # Copyright (c) 2012 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.
 
 {
   'variables': {
     'shared_generated_dir': '<(SHARED_INTERMEDIATE_DIR)/audio_processing/asm_offsets',
     # Outputs some low-level debug files.
     'aec_debug_dump%': 0,
+
+    # Chooses whether the intelligibility enhancer should be used.
+    'intelligibility_enhancer': 0,

[kjellander_webrtc, 2016/08/26 12:52:01]

This won't be useful as it'll always be set to 0. If it's used in more than one
file (as it is here), you should declare it it in webrtc/build/common.gypi and
use the % format to make it possible to override it:

'intelligibility_enhancer%': 0,

[peah-webrtc, 2016/08/26 13:09:43]

Great point!

Done.

   },
   'targets': [
     {
       'target_name': 'audio_processing',
       'type': 'static_library',
       'variables': {
         # Outputs some low-level debug files.
         'agc_debug_dump%': 0,
 
         # Disables the usual mode where we trust the reported system delay
@@ skipping 54 matching lines @@
         'echo_cancellation_impl.h',
         'echo_control_mobile_impl.cc',
         'echo_control_mobile_impl.h',
         'gain_control_for_experimental_agc.cc',
         'gain_control_for_experimental_agc.h',
         'gain_control_impl.cc',
         'gain_control_impl.h',
         'high_pass_filter_impl.cc',
         'high_pass_filter_impl.h',
         'include/audio_processing.h',
-        'intelligibility/intelligibility_enhancer.cc',
-        'intelligibility/intelligibility_enhancer.h',
-        'intelligibility/intelligibility_utils.cc',
-        'intelligibility/intelligibility_utils.h',
         'level_controller/biquad_filter.cc',
         'level_controller/biquad_filter.h',
         'level_controller/down_sampler.cc',
         'level_controller/down_sampler.h',
         'level_controller/gain_applier.cc',
         'level_controller/gain_applier.h',
         'level_controller/gain_selector.cc',
         'level_controller/gain_selector.h',
         'level_controller/lc_constants.h',
         'level_controller/level_controller.cc',
@@ skipping 75 matching lines @@
         ['aec_untrusted_delay_for_testing==1', {
           'defines': ['WEBRTC_UNTRUSTED_DELAY',],
         }],
         ['agc_debug_dump==1', {
           'defines': ['WEBRTC_AGC_DEBUG_DUMP',],
         }],
         ['enable_protobuf==1', {
           'dependencies': ['audioproc_debug_proto'],
           'defines': ['WEBRTC_AUDIOPROC_DEBUG_DUMP'],
         }],
+        ['intelligibility_enhancer==1', {
+          'defines': ['WEBRTC_INTELLIGIBILITY_ENHANCER=1',],
+          'sources': [
+            'intelligibility/intelligibility_enhancer.cc',
+            'intelligibility/intelligibility_enhancer.h',
+            'intelligibility/intelligibility_utils.cc',
+            'intelligibility/intelligibility_utils.h',
+          ],
+        }, {
+          'defines': ['WEBRTC_INTELLIGIBILITY_ENHANCER=0',],
+        }],
         ['prefer_fixed_point==1', {
           'defines': ['WEBRTC_NS_FIXED'],
           'sources': [
             'ns/noise_suppression_x.h',
             'ns/noise_suppression_x.c',
             'ns/nsx_core.c',
             'ns/nsx_core.h',
             'ns/nsx_defines.h',
           ],
           'conditions': [
@@ skipping 108 matching lines @@
             'defines': ['WEBRTC_AEC_DEBUG_DUMP=1',],
           }],
           ['aec_debug_dump==0', {
             'defines': ['WEBRTC_AEC_DEBUG_DUMP=0',],
           }],
         ],
       }],
     }],
   ],
 }