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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// 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 <endpointvolume.h>
#include <mmdeviceapi.h>
#include <memory>
#include "base/macros.h"
#include "base/threading/thread_checker.h"
#include "base/timer/timer.h"
#include "base/win/scoped_co_mem.h"
#include "base/win/scoped_comptr.h"
#include "remoting/host/audio_capturer.h"
#include "remoting/host/audio_silence_detector.h"
#include "remoting/proto/audio.pb.h"
namespace remoting {
class AudioCapturerWin : public AudioCapturer {
public:
AudioCapturerWin();
~AudioCapturerWin() override;
// AudioCapturer interface.
bool Start(const PacketCapturedCallback& callback) override;
private:
// An IMMNotificationClient implementation to detect the event of default
// audio device recently changed. If it indicates a changed happend recently,
// we need to recreate all audio components.
class MMNotificationClient;
// 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();
// Returns current volume setting of the host, in range [0.0, 1.0]. If the
// audio has been muted, this function returns 0. If Windows API returns error
// (such as audio device has been disabled or unpluged), this function ignores
// host volume setting, and returns 1.0.
float GetAudioLevel();
// Processes a series of samples, and executes callback if the packet is
// qualified to be sent to client.
void ProcessSamples(uint8_t* data, size_t frames);
PacketCapturedCallback callback_;
AudioPacket::SamplingRate sampling_rate_;
std::unique_ptr<base::RepeatingTimer> capture_timer_;
base::TimeDelta audio_device_period_;
AudioSilenceDetector silence_detector_;
base::win::ScopedCoMem<WAVEFORMATEX> wave_format_ex_;
base::win::ScopedComPtr<IMMDeviceEnumerator> mm_device_enumerator_;
base::win::ScopedComPtr<IAudioCaptureClient> audio_capture_client_;
base::win::ScopedComPtr<IAudioClient> audio_client_;
base::win::ScopedComPtr<IMMDevice> mm_device_;
base::win::ScopedComPtr<IAudioEndpointVolume> audio_volume_;
const std::unique_ptr<MMNotificationClient> mm_notification_client_;
HRESULT last_capture_error_;
base::ThreadChecker thread_checker_;
DISALLOW_COPY_AND_ASSIGN(AudioCapturerWin);
};
} // namespace remoting
#endif // REMOTING_HOST_AUDIO_CAPTURER_WIN_H_
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