modules/audio_device/win/core_audio_input_win.h

/*
 *  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_DEVICE_WIN_CORE_AUDIO_INPUT_WIN_H_
#define MODULES_AUDIO_DEVICE_WIN_CORE_AUDIO_INPUT_WIN_H_

#include <memory>
#include <string>

#include "absl/types/optional.h"
#include "modules/audio_device/win/audio_device_module_win.h"
#include "modules/audio_device/win/core_audio_base_win.h"

namespace webrtc {

class AudioDeviceBuffer;
class FineAudioBuffer;

namespace webrtc_win {

// Windows specific AudioInput implementation using a CoreAudioBase class where
// an input direction is set at construction. Supports capture device handling
// and streaming of captured audio to a WebRTC client.
class CoreAudioInput final : public CoreAudioBase, public AudioInput {
 public:
  CoreAudioInput(bool automatic_restart);
  ~CoreAudioInput() override;

  // AudioInput implementation.
  int Init() override;
  int Terminate() override;
  int NumDevices() const override;
  int SetDevice(int index) override;
  int SetDevice(AudioDeviceModule::WindowsDeviceType device) override;
  int DeviceName(int index, std::string* name, std::string* guid) override;
  void AttachAudioBuffer(AudioDeviceBuffer* audio_buffer) override;
  bool RecordingIsInitialized() const override;
  int InitRecording() override;
  int StartRecording() override;
  int StopRecording() override;
  bool Recording() override;
  int VolumeIsAvailable(bool* available) override;
  int RestartRecording() override;
  bool Restarting() const override;
  int SetSampleRate(uint32_t sample_rate) override;

  CoreAudioInput(const CoreAudioInput&) = delete;
  CoreAudioInput& operator=(const CoreAudioInput&) = delete;

 private:
  void ReleaseCOMObjects();
  bool OnDataCallback(uint64_t device_frequency);
  bool OnErrorCallback(ErrorType error);
  absl::optional<int> EstimateLatencyMillis(uint64_t capture_time_100ns);
  bool HandleStreamDisconnected();

  std::unique_ptr<FineAudioBuffer> fine_audio_buffer_;
  Microsoft::WRL::ComPtr<IAudioCaptureClient> audio_capture_client_;
  absl::optional<double> qpc_to_100ns_;
};

}  // namespace webrtc_win

}  // namespace webrtc

#endif  // MODULES_AUDIO_DEVICE_WIN_CORE_AUDIO_INPUT_WIN_H_