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/*
* 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_
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