Recordly/electron/native/windows-capture/src/wasapi_loopback.h

#pragma once

#include <windows.h>
#include <mmdeviceapi.h>
#include <audioclient.h>
#include <string>
#include <thread>
#include <atomic>
#include <vector>

class WasapiCapture {
public:
    WasapiCapture();
    ~WasapiCapture();

    bool initializeLoopback(const std::string& outputPath);
    bool initializeMic(const std::string& outputPath, const std::string& deviceName = "");
    bool start();
    bool pause();
    bool resume();
    void stop();

private:
    bool initializeCommon();
    void captureThread();
    bool writeWavHeader(HANDLE file, DWORD dataSize);
    IMMDevice* findCaptureDeviceByName(const std::wstring& name);

    std::string outputPath_;
    std::thread thread_;
    std::atomic<bool> capturing_{false};
    std::atomic<bool> paused_{false};
    HANDLE outputFile_ = INVALID_HANDLE_VALUE;
    DWORD totalDataBytes_ = 0;

    IMMDeviceEnumerator* enumerator_ = nullptr;
    IMMDevice* device_ = nullptr;
    IAudioClient* audioClient_ = nullptr;
    IAudioCaptureClient* captureClient_ = nullptr;
    WAVEFORMATEX* mixFormat_ = nullptr;
    DWORD streamFlags_ = 0;

    UINT32 bufferFrameCount_ = 0;
};