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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef REMOTING_HOST_AUDIO_CAPTURER_WIN_H_
#define REMOTING_HOST_AUDIO_CAPTURER_WIN_H_
#include <audioclient.h>
#include <mmdeviceapi.h>
#include <wrl/client.h>
#include <memory>
#include "base/threading/thread_checker.h"
#include "base/time/time.h"
#include "base/timer/timer.h"
#include "base/win/scoped_co_mem.h"
#include "remoting/host/audio_capturer.h"
#include "remoting/host/win/audio_volume_filter_win.h"
#include "remoting/proto/audio.pb.h"
namespace remoting {
class DefaultAudioDeviceChangeDetector;
// An AudioCapturer implementation for Windows by using Windows Audio Session
// API, a.k.a. WASAPI. It supports up to 8 channels, but treats all layouts as
// a most commonly used one. E.g. 3.1 and surround layouts will both be marked
// as surround layout.
class AudioCapturerWin : public AudioCapturer {
public:
AudioCapturerWin();
AudioCapturerWin(const AudioCapturerWin&) = delete;
AudioCapturerWin& operator=(const AudioCapturerWin&) = delete;
~AudioCapturerWin() override;
// AudioCapturer interface.
bool Start(const PacketCapturedCallback& callback) override;
private:
// Executes Deinitialize() and Initialize(). If Initialize() function call
// returns false, Deinitialize() will be called again to ensure we will
// initialize COM components again.
bool ResetAndInitialize();
// Resets all COM components to nullptr, so is_initialized() will return
// false.
void Deinitialize();
// Initializes default audio device related components. These components must
// be recreated once the default audio device changed. Returns false if
// initialization failed.
bool Initialize();
// Whether all components are correctly initialized. If last
// Initialize() function call failed, this function will return false.
// Otherwise this function will return true.
bool is_initialized() const;
// Receives all packets from the audio capture endpoint buffer and pushes them
// to the network.
void DoCapture();
PacketCapturedCallback callback_;
AudioPacket::SamplingRate sampling_rate_;
std::unique_ptr<base::RepeatingTimer> capture_timer_;
base::TimeDelta audio_device_period_;
AudioVolumeFilterWin volume_filter_;
base::win::ScopedCoMem<WAVEFORMATEX> wave_format_ex_;
Microsoft::WRL::ComPtr<IAudioCaptureClient> audio_capture_client_;
Microsoft::WRL::ComPtr<IAudioClient> audio_client_;
Microsoft::WRL::ComPtr<IMMDevice> mm_device_;
std::unique_ptr<DefaultAudioDeviceChangeDetector> default_device_detector_;
HRESULT last_capture_error_;
base::ThreadChecker thread_checker_;
};
} // namespace remoting
#endif // REMOTING_HOST_AUDIO_CAPTURER_WIN_H_
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