APM: add AudioProcessingBuilder::SetConfig()

Bug: webrtc:5298
Change-Id: If3468ebb841c49dcd410a8bea2f9f8111ee8bc06
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/234842
Reviewed-by: Per Åhgren <peah@webrtc.org>
Commit-Queue: Alessio Bazzica <alessiob@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#35199}

modules/audio_processing/include/audio_processing.h

@@ -743,48 +743,64 @@ class RTC_EXPORT AudioProcessing : public rtc::RefCountInterface {
 class RTC_EXPORT AudioProcessingBuilder {
  public:
   AudioProcessingBuilder();
+  AudioProcessingBuilder(const AudioProcessingBuilder&) = delete;
+  AudioProcessingBuilder& operator=(const AudioProcessingBuilder&) = delete;
   ~AudioProcessingBuilder();
-  // The AudioProcessingBuilder takes ownership of the echo_control_factory.
+
+  // Sets the APM configuration.
+  AudioProcessingBuilder& SetConfig(const AudioProcessing::Config& config) {
+    config_ = config;
+    return *this;
+  }
+
+  // Sets the echo controller factory to inject when APM is created.
   AudioProcessingBuilder& SetEchoControlFactory(
       std::unique_ptr<EchoControlFactory> echo_control_factory) {
     echo_control_factory_ = std::move(echo_control_factory);
     return *this;
   }
-  // The AudioProcessingBuilder takes ownership of the capture_post_processing.
+
+  // Sets the capture post-processing sub-module to inject when APM is created.
   AudioProcessingBuilder& SetCapturePostProcessing(
       std::unique_ptr<CustomProcessing> capture_post_processing) {
     capture_post_processing_ = std::move(capture_post_processing);
     return *this;
   }
-  // The AudioProcessingBuilder takes ownership of the render_pre_processing.
+
+  // Sets the render pre-processing sub-module to inject when APM is created.
   AudioProcessingBuilder& SetRenderPreProcessing(
       std::unique_ptr<CustomProcessing> render_pre_processing) {
     render_pre_processing_ = std::move(render_pre_processing);
     return *this;
   }
-  // The AudioProcessingBuilder takes ownership of the echo_detector.
+
+  // Sets the echo detector to inject when APM is created.
   AudioProcessingBuilder& SetEchoDetector(
       rtc::scoped_refptr<EchoDetector> echo_detector) {
     echo_detector_ = std::move(echo_detector);
     return *this;
   }
-  // The AudioProcessingBuilder takes ownership of the capture_analyzer.
+
+  // Sets the capture analyzer sub-module to inject when APM is created.
   AudioProcessingBuilder& SetCaptureAnalyzer(
       std::unique_ptr<CustomAudioAnalyzer> capture_analyzer) {
     capture_analyzer_ = std::move(capture_analyzer);
     return *this;
   }
-  // This creates an APM instance using the previously set components. Calling
-  // the Create function resets the AudioProcessingBuilder to its initial state.
+
+  // Creates an APM instance with the specified config or the default one if
+  // unspecified. Injects the specified components transferring the ownership
+  // to the newly created APM instance - i.e., except for the config, the
+  // builder is reset to its initial state.
   rtc::scoped_refptr<AudioProcessing> Create();
 
  private:
+  AudioProcessing::Config config_;
   std::unique_ptr<EchoControlFactory> echo_control_factory_;
   std::unique_ptr<CustomProcessing> capture_post_processing_;
   std::unique_ptr<CustomProcessing> render_pre_processing_;
   rtc::scoped_refptr<EchoDetector> echo_detector_;
   std::unique_ptr<CustomAudioAnalyzer> capture_analyzer_;
-  RTC_DISALLOW_COPY_AND_ASSIGN(AudioProcessingBuilder);
 };
 
 class StreamConfig {