1 files changed, 74 insertions, 0 deletions
diff --git a/third_party/libwebrtc/modules/audio_processing/test/fake_recording_device.h b/third_party/libwebrtc/modules/audio_processing/test/fake_recording_device.h
new file mode 100644
index 0000000000..da3c0cf794
--- /dev/null
+++ b/third_party/libwebrtc/modules/audio_processing/test/fake_recording_device.h
@@ -0,0 +1,74 @@
+/*
+ *  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 MODULES_AUDIO_PROCESSING_TEST_FAKE_RECORDING_DEVICE_H_
+#define MODULES_AUDIO_PROCESSING_TEST_FAKE_RECORDING_DEVICE_H_
+
+#include <algorithm>
+#include <memory>
+#include <vector>
+
+#include "api/array_view.h"
+#include "common_audio/channel_buffer.h"
+#include "rtc_base/checks.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.SimulateAnalogGain(buffer);
+//
+// When the mic level to undo is known:
+//
+// fake_mic.SetMicLevel(170);
+// fake_mic.SetUndoMicLevel(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(int level);
+  void SetUndoMicLevel(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(rtc::ArrayView<int16_t> 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  // MODULES_AUDIO_PROCESSING_TEST_FAKE_RECORDING_DEVICE_H_