Introduced new scheme for controlling the functionality inside the audio processing module

webrtc/modules/audio_processing/audio_processing_impl.cc

Index: webrtc/modules/audio_processing/audio_processing_impl.cc
diff --git a/webrtc/modules/audio_processing/audio_processing_impl.cc b/webrtc/modules/audio_processing/audio_processing_impl.cc
index 011325f8ca1cc00a525d01e11ef296db4ecddf52..c668f3bb93d9090e04cc6cfc09471f3d5346519f 100644
--- a/webrtc/modules/audio_processing/audio_processing_impl.cc
+++ b/webrtc/modules/audio_processing/audio_processing_impl.cc
@@ -114,8 +114,16 @@ int ClosestHigherNativeRate(int min_proc_rate) {
   return AudioProcessing::kMaxNativeSampleRateHz;
 }
 
+bool ValidateConfig(const AudioProcessing::Config& config) {
+  return webrtc::LevelController::Validate(config.level_controller);
+}
+
 }  // namespace
 
+bool AudioProcessing::Config::Validate() const {
+  return ValidateConfig(*this);
+}
+
 // Throughout webrtc, it's assumed that success is represented by zero.
 static_assert(AudioProcessing::kNoError == 0, "kNoError must be zero");
 
@@ -149,15 +157,15 @@ struct AudioProcessingImpl::ApmPrivateSubmodules {
 };
 
 AudioProcessing* AudioProcessing::Create() {
-  Config config;
+  webrtc::Config config;
   return Create(config, nullptr);
 }
 
-AudioProcessing* AudioProcessing::Create(const Config& config) {
+AudioProcessing* AudioProcessing::Create(const webrtc::Config& config) {
   return Create(config, nullptr);
 }
 
-AudioProcessing* AudioProcessing::Create(const Config& config,
+AudioProcessing* AudioProcessing::Create(const webrtc::Config& config,
                                          NonlinearBeamformer* beamformer) {
   AudioProcessingImpl* apm = new AudioProcessingImpl(config, beamformer);
   if (apm->Initialize() != kNoError) {
@@ -168,10 +176,10 @@ AudioProcessing* AudioProcessing::Create(const Config& config,
   return apm;
 }
 
-AudioProcessingImpl::AudioProcessingImpl(const Config& config)
+AudioProcessingImpl::AudioProcessingImpl(const webrtc::Config& config)
     : AudioProcessingImpl(config, nullptr) {}
 
-AudioProcessingImpl::AudioProcessingImpl(const Config& config,
+AudioProcessingImpl::AudioProcessingImpl(const webrtc::Config& config,
                                          NonlinearBeamformer* beamformer)
     : public_submodules_(new ApmPublicSubmodules()),
       private_submodules_(new ApmPrivateSubmodules(beamformer)),
@@ -189,8 +197,7 @@ AudioProcessingImpl::AudioProcessingImpl(const Config& config,
                config.Get<Beamforming>().array_geometry,
                config.Get<Beamforming>().target_direction),
       capture_nonlocked_(config.Get<Beamforming>().enabled,
-                         config.Get<Intelligibility>().enabled,
-                         config.Get<LevelControl>().enabled) {
+                         config.Get<Intelligibility>().enabled) {
   {
     rtc::CritScope cs_render(&crit_render_);
     rtc::CritScope cs_capture(&crit_capture_);
@@ -413,7 +420,30 @@ int AudioProcessingImpl::InitializeLocked(const ProcessingConfig& config) {
   return InitializeLocked();
 }
 
-void AudioProcessingImpl::SetExtraOptions(const Config& config) {
+bool AudioProcessingImpl::ApplyConfig(const AudioProcessing::Config& config) {
+  bool config_ok = config.Validate();
+  RTC_DCHECK(config_ok);
+  if (!config_ok) {
+    return false;
+  }
+
+  // Run in a single-threaded manner when applying the settings.
+  rtc::CritScope cs_render(&crit_render_);
+  rtc::CritScope cs_capture(&crit_capture_);
+
+  if (config.level_controller.enabled !=
+      capture_nonlocked_.level_controller_enabled) {
+    InitializeLevelController();
+    LOG(LS_INFO) << "Level controller activated: "
+                 << capture_nonlocked_.level_controller_enabled;
+    capture_nonlocked_.level_controller_enabled =
+        config.level_controller.enabled;
+  }
+
+  return true;
+}
+
+void AudioProcessingImpl::SetExtraOptions(const webrtc::Config& config) {
   // Run in a single-threaded manner when setting the extra options.
   rtc::CritScope cs_render(&crit_render_);
   rtc::CritScope cs_capture(&crit_capture_);
@@ -427,16 +457,6 @@ void AudioProcessingImpl::SetExtraOptions(const Config& config) {
     InitializeTransient();
   }
 
-  if (capture_nonlocked_.level_controller_enabled !=
-      config.Get<LevelControl>().enabled) {
-    capture_nonlocked_.level_controller_enabled =
-        config.Get<LevelControl>().enabled;
-    LOG(LS_INFO) << "Level controller activated: "
-                 << config.Get<LevelControl>().enabled;
-
-    InitializeLevelController();
-  }
-
 #if WEBRTC_INTELLIGIBILITY_ENHANCER
   if(capture_nonlocked_.intelligibility_enabled !=
      config.Get<Intelligibility>().enabled) {