WasapiAudioPlayer.h

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#pragma once
 
#ifdef _WIN32
 
#include "AudioPlayer.h"
#include <wrl/client.h>
#include <mmdeviceapi.h>
#include <audioclient.h>
#include <mutex>
 
using namespace Microsoft::WRL;
 
namespace Ship {
class WasapiAudioPlayer : public AudioPlayer, public IMMNotificationClient {
  public:
    WasapiAudioPlayer(AudioSettings settings) : AudioPlayer(settings) {
    }
 
    ~WasapiAudioPlayer();
 
    int Buffered() override;
 
  protected:
    bool DoInit() override;
 
    void DoClose() override;
 
    void DoPlay(const uint8_t* buf, size_t len) override;
 
    // IMMNotificationClient overrides — used to detect audio device changes.
 
    virtual HRESULT STDMETHODCALLTYPE OnDeviceStateChanged(LPCWSTR pwstrDeviceId, DWORD dwNewState);
 
    virtual HRESULT STDMETHODCALLTYPE OnDeviceAdded(LPCWSTR pwstrDeviceId);
 
    virtual HRESULT STDMETHODCALLTYPE OnDeviceRemoved(LPCWSTR pwstrDeviceId);
 
    virtual HRESULT STDMETHODCALLTYPE OnDefaultDeviceChanged(EDataFlow flow, ERole role, LPCWSTR pwstrDefaultDeviceId);
 
    virtual HRESULT STDMETHODCALLTYPE OnPropertyValueChanged(LPCWSTR pwstrDeviceId, const PROPERTYKEY key);
 
    virtual ULONG STDMETHODCALLTYPE AddRef();
 
    virtual ULONG STDMETHODCALLTYPE Release();
 
    virtual HRESULT STDMETHODCALLTYPE QueryInterface(REFIID riid, VOID** ppvInterface);
 
    void ThrowIfFailed(HRESULT res);
 
    bool SetupStream();
 
  private:
    ComPtr<IMMDeviceEnumerator> mDeviceEnumerator; 
    ComPtr<IMMDevice> mDevice;                     
    ComPtr<IAudioClient> mClient;                  
    ComPtr<IAudioRenderClient> mRenderClient;      
    LONG mRefCount = 1;                            
    UINT32 mBufferFrameCount = 0;                  
    bool mInitialized = false;                     
    bool mStarted = false;                         
    int32_t mNumChannels = 2;                      
    std::mutex mMutex;                             
};
} // namespace Ship
#endif