Removed the dependency in GainControlImpl on the ProcessingComponent class

webrtc/modules/audio_processing/audio_processing_impl.cc

 /*
  *  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.
  */
 
@@ skipping 63 matching lines @@
   assert(false);
   return false;
 }
 }  // namespace
 
 // Throughout webrtc, it's assumed that success is represented by zero.
 static_assert(AudioProcessing::kNoError == 0, "kNoError must be zero");
 
 struct AudioProcessingImpl::ApmPublicSubmodules {
   ApmPublicSubmodules()
-      : echo_cancellation(nullptr),
-        echo_control_mobile(nullptr),
-        gain_control(nullptr) {}
+      : echo_cancellation(nullptr), echo_control_mobile(nullptr) {}

[the sun, 2016/03/09 09:42:10]

Need a rebase?

[peah-webrtc, 2016/03/09 12:23:39]

Yes definitely, I delayed that though as that would introduce noise in the code
review. 

   // Accessed externally of APM without any lock acquired.
   std::unique_ptr<EchoCancellationImpl> echo_cancellation;
   EchoControlMobileImpl* echo_control_mobile;
-  GainControlImpl* gain_control;
+  std::unique_ptr<GainControlImpl> gain_control;
   std::unique_ptr<HighPassFilterImpl> high_pass_filter;
   std::unique_ptr<LevelEstimatorImpl> level_estimator;
   std::unique_ptr<NoiseSuppressionImpl> noise_suppression;
   std::unique_ptr<VoiceDetectionImpl> voice_detection;
   std::unique_ptr<GainControlForExperimentalAgc>
       gain_control_for_experimental_agc;
 
   // Accessed internally from both render and capture.
   std::unique_ptr<TransientSuppressor> transient_suppressor;
   std::unique_ptr<IntelligibilityEnhancer> intelligibility_enhancer;
@@ skipping 64 matching lines @@
       capture_nonlocked_(config.Get<Beamforming>().enabled)
 {
   {
     rtc::CritScope cs_render(&crit_render_);
     rtc::CritScope cs_capture(&crit_capture_);
 
     public_submodules_->echo_cancellation.reset(
         new EchoCancellationImpl(this, &crit_render_, &crit_capture_));
     public_submodules_->echo_control_mobile =
         new EchoControlMobileImpl(this, &crit_render_, &crit_capture_);
-    public_submodules_->gain_control =
-        new GainControlImpl(this, &crit_capture_, &crit_capture_);
+    public_submodules_->gain_control.reset(
+        new GainControlImpl(this, &crit_capture_, &crit_capture_));
     public_submodules_->high_pass_filter.reset(
         new HighPassFilterImpl(&crit_capture_));
     public_submodules_->level_estimator.reset(
         new LevelEstimatorImpl(&crit_capture_));
     public_submodules_->noise_suppression.reset(
         new NoiseSuppressionImpl(&crit_capture_));
     public_submodules_->voice_detection.reset(
         new VoiceDetectionImpl(&crit_capture_));
     public_submodules_->gain_control_for_experimental_agc.reset(
-        new GainControlForExperimentalAgc(public_submodules_->gain_control,
-                                          &crit_capture_));
-    private_submodules_->component_list.push_back(
-        public_submodules_->gain_control);
+        new GainControlForExperimentalAgc(
+            public_submodules_->gain_control.get(), &crit_capture_));
   }
 
   SetExtraOptions(config);
 }
 
 AudioProcessingImpl::~AudioProcessingImpl() {
   // Depends on gain_control_ and
   // public_submodules_->gain_control_for_experimental_agc.
   private_submodules_->agc_manager.reset();
   // Depends on gain_control_.
@@ skipping 110 matching lines @@
                       formats_.api_format.output_stream().num_frames()));
 
   // Initialize all components.
   for (auto item : private_submodules_->component_list) {
     int err = item->Initialize();
     if (err != kNoError) {
       return err;
     }
   }
 
+  InitializeGainController();
   InitializeEchoCanceller();
   InitializeEchoControlMobile();
   InitializeExperimentalAgc();
   InitializeTransient();
   InitializeBeamformer();
   InitializeIntelligibility();
   InitializeHighPassFilter();
   InitializeNoiseSuppression();
   InitializeLevelEstimator();
   InitializeVoiceDetection();
@@ skipping 764 matching lines @@
   // from the returned pointer.
   return public_submodules_->echo_control_mobile;
 }
 
 GainControl* AudioProcessingImpl::gain_control() const {
   // Adding a lock here has no effect as it allows any access to the submodule
   // from the returned pointer.
   if (constants_.use_experimental_agc) {
     return public_submodules_->gain_control_for_experimental_agc.get();
   }
-  return public_submodules_->gain_control;
+  return public_submodules_->gain_control.get();
 }
 
 HighPassFilter* AudioProcessingImpl::high_pass_filter() const {
   // Adding a lock here has no effect as it allows any access to the submodule
   // from the returned pointer.
   return public_submodules_->high_pass_filter.get();
 }
 
 LevelEstimator* AudioProcessingImpl::level_estimator() const {
   // Adding a lock here has no effect as it allows any access to the submodule
@@ skipping 13 matching lines @@
   return public_submodules_->voice_detection.get();
 }
 
 bool AudioProcessingImpl::is_data_processed() const {
   // The beamformer, noise suppressor and highpass filter
   // modify the data.
   if (capture_nonlocked_.beamformer_enabled ||
       public_submodules_->high_pass_filter->is_enabled() ||
       public_submodules_->noise_suppression->is_enabled() ||
       public_submodules_->echo_cancellation->is_enabled() ||
-      public_submodules_->echo_control_mobile->is_enabled()) {
+      public_submodules_->echo_control_mobile->is_enabled() ||
+      public_submodules_->gain_control->is_enabled()) {
     return true;
   }
 
   // All of the private submodules modify the data.
   for (auto item : private_submodules_->component_list) {
     if (item->is_component_enabled()) {
       return true;
     }
   }
 
@@ skipping 43 matching lines @@
 
 bool AudioProcessingImpl::rev_conversion_needed() const {
   return (formats_.api_format.reverse_input_stream() !=
           formats_.api_format.reverse_output_stream());
 }
 
 void AudioProcessingImpl::InitializeExperimentalAgc() {
   if (constants_.use_experimental_agc) {
     if (!private_submodules_->agc_manager.get()) {
       private_submodules_->agc_manager.reset(new AgcManagerDirect(
-          public_submodules_->gain_control,
+          public_submodules_->gain_control.get(),
           public_submodules_->gain_control_for_experimental_agc.get(),
           constants_.agc_startup_min_volume));
     }
     private_submodules_->agc_manager->Initialize();
     private_submodules_->agc_manager->SetCaptureMuted(
         capture_.output_will_be_muted);
   }
 }
 
 void AudioProcessingImpl::InitializeTransient() {
@@ skipping 34 matching lines @@
 
 void AudioProcessingImpl::InitializeNoiseSuppression() {
   public_submodules_->noise_suppression->Initialize(num_proc_channels(),
                                                     proc_sample_rate_hz());
 }
 
 void AudioProcessingImpl::InitializeEchoCanceller() {
   public_submodules_->echo_cancellation->Initialize();
 }
 
+void AudioProcessingImpl::InitializeGainController() {
+  public_submodules_->gain_control->Initialize();
+}
+
 void AudioProcessingImpl::InitializeEchoControlMobile() {
   public_submodules_->echo_control_mobile->Initialize();
 }
 
 void AudioProcessingImpl::InitializeLevelEstimator() {
   public_submodules_->level_estimator->Initialize();
 }
 
 void AudioProcessingImpl::InitializeVoiceDetection() {
   public_submodules_->voice_detection->Initialize(proc_split_sample_rate_hz());
@@ skipping 194 matching lines @@
   debug_dump_.capture.event_msg->mutable_config()->CopyFrom(config);
 
   RETURN_ON_ERR(WriteMessageToDebugFile(debug_dump_.debug_file.get(),
                                         &debug_dump_.num_bytes_left_for_log_,
                                         &crit_debug_, &debug_dump_.capture));
   return kNoError;
 }
 #endif  // WEBRTC_AUDIOPROC_DEBUG_DUMP
 
 }  // namespace webrtc