audioproc_f with simulated mic analog gain

webrtc/modules/audio_processing/test/fake_recording_device.h

Index: webrtc/modules/audio_processing/test/fake_recording_device.h
diff --git a/webrtc/modules/audio_processing/test/fake_recording_device.h b/webrtc/modules/audio_processing/test/fake_recording_device.h
new file mode 100644
index 0000000000000000000000000000000000000000..c49da4c4bf6621b86f395f1c7e3bd143bb793efb
--- /dev/null
+++ b/webrtc/modules/audio_processing/test/fake_recording_device.h
@@ -0,0 +1,77 @@
+/*
+ *  Copyright (c) 2017 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 WEBRTC_MODULES_AUDIO_PROCESSING_TEST_FAKE_RECORDING_DEVICE_H_
+#define WEBRTC_MODULES_AUDIO_PROCESSING_TEST_FAKE_RECORDING_DEVICE_H_
+
+#include <algorithm>
+#include <memory>
+#include <vector>
+
+#include "webrtc/common_audio/channel_buffer.h"
+#include "webrtc/modules/include/module_common_types.h"
+#include "webrtc/rtc_base/array_view.h"
+#include "webrtc/rtc_base/checks.h"
+#include "webrtc/rtc_base/optional.h"
+
+namespace webrtc {
+namespace test {
+
+class FakeRecordingDeviceWorker;
+
+// Class for simulating a microphone with analog gain.
+//
+// The intended modes of operation are the following:
+//
+// FakeRecordingDevice fake_mic(255, 1);
+//
+// fake_mic.SetMicLevel(170);
+// fake_mic.SetUndoMicLevel(rtc::Optional<int>());
+// fake_mic.SimulateAnalogGain(buffer);
+//
+// When the mic level to undo is known:
+//
+// fake_mic.SetMicLevel(170);
+// fake_mic.SetUndoMicLevel(rtc::Optional<int>(30));
+// fake_mic.SimulateAnalogGain(buffer);
+//
+// The second option virtually restores the unmodified microphone level. Calling
+// SimulateAnalogGain() will first "undo" the gain applied by the real
+// microphone (e.g., 30).
+class FakeRecordingDevice final {
+ public:
+  FakeRecordingDevice(int initial_mic_level, int device_kind);
+  ~FakeRecordingDevice();
+
+  int MicLevel() const;
+  void SetMicLevel(const int level);
+  void SetUndoMicLevel(const rtc::Optional<int> level);
+
+  // Simulates the analog gain.
+  // If |real_device_level| is a valid level, the unmodified mic signal is
+  // virtually restored. To skip the latter step set |real_device_level| to
+  // an empty value.
+  void SimulateAnalogGain(AudioFrame* buffer);
+
+  // Simulates the analog gain.
+  // If |real_device_level| is a valid level, the unmodified mic signal is
+  // virtually restored. To skip the latter step set |real_device_level| to
+  // an empty value.
+  void SimulateAnalogGain(ChannelBuffer<float>* buffer);
+
+ private:
+  // Fake recording device worker.
+  std::unique_ptr<FakeRecordingDeviceWorker> worker_;
+};
+
+}  // namespace test
+}  // namespace webrtc
+
+#endif  // WEBRTC_MODULES_AUDIO_PROCESSING_TEST_FAKE_RECORDING_DEVICE_H_