Move EchoControl out of audio_processing.h.

Bug: webrtc:8844
Change-Id: Id05c285e0e377774c79da8552959733f823d8bb4
Reviewed-on: https://webrtc-review.googlesource.com/47900
Reviewed-by: Per Åhgren <peah@webrtc.org>
Commit-Queue: Gustaf Ullberg <gustaf@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#21898}

modules/audio_processing/BUILD.gn

@@ -155,6 +155,7 @@ rtc_static_library("audio_processing") {
     "include/audio_processing.h",
     "include/config.cc",
     "include/config.h",
+    "include/echo_control.h",
     "level_controller/biquad_filter.cc",
     "level_controller/biquad_filter.h",
     "level_controller/down_sampler.cc",

modules/audio_processing/include/audio_processing.h

@@ -26,6 +26,7 @@
 #include "modules/audio_processing/beamformer/array_util.h"
 #include "modules/audio_processing/include/audio_processing_statistics.h"
 #include "modules/audio_processing/include/config.h"
+#include "modules/audio_processing/include/echo_control.h"
 #include "rtc_base/arraysize.h"
 #include "rtc_base/deprecation.h"
 #include "rtc_base/platform_file.h"
@@ -48,7 +49,6 @@ class ProcessingConfig;
 
 class EchoCancellation;
 class EchoControlMobile;
-class EchoControlFactory;
 class EchoDetector;
 class GainControl;
 class HighPassFilter;
@@ -913,37 +913,6 @@ class EchoControlMobile {
   virtual ~EchoControlMobile() {}
 };
 
-// Interface for an acoustic echo cancellation (AEC) submodule.
-class EchoControl {
- public:
-  // Analysis (not changing) of the render signal.
-  virtual void AnalyzeRender(AudioBuffer* render) = 0;
-
-  // Analysis (not changing) of the capture signal.
-  virtual void AnalyzeCapture(AudioBuffer* capture) = 0;
-
-  // Processes the capture signal in order to remove the echo.
-  virtual void ProcessCapture(AudioBuffer* capture, bool echo_path_change) = 0;
-
-  struct Metrics {
-    double echo_return_loss;
-    double echo_return_loss_enhancement;
-    int delay_ms;
-  };
-
-  // Collect current metrics from the echo controller.
-  virtual Metrics GetMetrics() const = 0;
-
-  virtual ~EchoControl() {}
-};
-
-// Interface for a factory that creates EchoControllers.
-class EchoControlFactory {
- public:
-  virtual std::unique_ptr<EchoControl> Create(int sample_rate_hz) = 0;
-  virtual ~EchoControlFactory() = default;
-};
-
 // The automatic gain control (AGC) component brings the signal to an
 // appropriate range. This is done by applying a digital gain directly and, in
 // the analog mode, prescribing an analog gain to be applied at the audio HAL.

modules/audio_processing/include/echo_control.h

@@ -0,0 +1,52 @@
+/*
+ *  Copyright (c) 2018 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.
+ */
+
+#ifndef MODULES_AUDIO_PROCESSING_INCLUDE_ECHO_CONTROL_H_
+#define MODULES_AUDIO_PROCESSING_INCLUDE_ECHO_CONTROL_H_
+
+#include <memory>
+
+namespace webrtc {
+
+class AudioBuffer;
+
+// Interface for an acoustic echo cancellation (AEC) submodule.
+class EchoControl {
+ public:
+  // Analysis (not changing) of the render signal.
+  virtual void AnalyzeRender(AudioBuffer* render) = 0;
+
+  // Analysis (not changing) of the capture signal.
+  virtual void AnalyzeCapture(AudioBuffer* capture) = 0;
+
+  // Processes the capture signal in order to remove the echo.
+  virtual void ProcessCapture(AudioBuffer* capture, bool echo_path_change) = 0;
+
+  struct Metrics {
+    double echo_return_loss;
+    double echo_return_loss_enhancement;
+    int delay_ms;
+  };
+
+  // Collect current metrics from the echo controller.
+  virtual Metrics GetMetrics() const = 0;
+
+  virtual ~EchoControl() {}
+};
+
+// Interface for a factory that creates EchoControllers.
+class EchoControlFactory {
+ public:
+  virtual std::unique_ptr<EchoControl> Create(int sample_rate_hz) = 0;
+  virtual ~EchoControlFactory() = default;
+};
+}  // namespace webrtc
+
+#endif  // MODULES_AUDIO_PROCESSING_INCLUDE_ECHO_CONTROL_H_