Deactivated the intelligibility enhancement functionality by default

webrtc/media/engine/webrtcvoiceengine.cc

 /*
  *  Copyright (c) 2004 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.
  */
 
@@ skipping 46 matching lines @@
 // On Windows systems which only support Wave Audio style default, uses either
 // -1 or 0 to select the default device.
 #ifdef WIN32
 const int kDefaultAudioDeviceId = -1;
 #elif !defined(WEBRTC_IOS)
 const int kDefaultAudioDeviceId = 0;
 #endif
 
 constexpr int kNackRtpHistoryMs = 5000;
 
+// Check to verify that the define for the intelligibility enhancer is properly
+// set.
+#if !defined(WEBRTC_INTELLIGIBILITY_ENHANCER) || \
+    (WEBRTC_INTELLIGIBILITY_ENHANCER != 0 &&     \
+     WEBRTC_INTELLIGIBILITY_ENHANCER != 1)
+#error "Set WEBRTC_INTELLIGIBILITY_ENHANCER to either 0 or 1"
+#endif
+
 // Codec parameters for Opus.
 // draft-spittka-payload-rtp-opus-03
 
 // Recommended bitrates:
 // 8-12 kb/s for NB speech,
 // 16-20 kb/s for WB speech,
 // 28-40 kb/s for FB speech,
 // 48-64 kb/s for FB mono music, and
 // 64-128 kb/s for FB stereo music.
 // The current implementation applies the following values to mono signals,
@@ skipping 565 matching lines @@
   if (options.delay_agnostic_aec) {
     use_delay_agnostic_aec = *options.delay_agnostic_aec;
     if (use_delay_agnostic_aec) {
       options.echo_cancellation = rtc::Optional<bool>(true);
       options.extended_filter_aec = rtc::Optional<bool>(true);
       ec_mode = webrtc::kEcConference;
     }
   }
 #endif
 
+#if (WEBRTC_INTELLIGIBILITY_ENHANCER == 0)
+  // Hardcode the intelligibility enhancer to be off.
+  options.intelligibility_enhancer = rtc::Optional<bool>(false);
+#endif
+
   webrtc::VoEAudioProcessing* voep = voe_wrapper_->processing();
 
   if (options.echo_cancellation) {
     // Check if platform supports built-in EC. Currently only supported on
     // Android and in combination with Java based audio layer.
     // TODO(henrika): investigate possibility to support built-in EC also
     // in combination with Open SL ES audio.
     const bool built_in_aec = adm()->BuiltInAECIsAvailable();
     if (built_in_aec) {
       // Built-in EC exists on this device and use_delay_agnostic_aec is not
@@ skipping 1988 matching lines @@
   RTC_DCHECK(worker_thread_checker_.CalledOnValidThread());
   const auto it = send_streams_.find(ssrc);
   if (it != send_streams_.end()) {
     return it->second->channel();
   }
   return -1;
 }
 }  // namespace cricket
 
 #endif  // HAVE_WEBRTC_VOICE