Windows-classic-samples/Samples/CaptureEngineVideoCapture/cpp/winmain.cpp

// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF
// ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO
// THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
// PARTICULAR PURPOSE.
//
// Copyright (c) Microsoft Corporation. All rights reserved.

#include "Capture.h"
#include "resource.h"

#include <shlobj.h>
#include <Shlwapi.h>
#include <powrprof.h>

// Include the v6 common controls in the manifest
#pragma comment(linker, \
    "\"/manifestdependency:type='Win32' "\
    "name='Microsoft.Windows.Common-Controls' "\
    "version='6.0.0.0' "\
    "processorArchitecture='*' "\
    "publicKeyToken='6595b64144ccf1df' "\
    "language='*'\"")

CaptureManager *g_pEngine = NULL;
HPOWERNOTIFY    g_hPowerNotify = NULL;
HPOWERNOTIFY    g_hPowerNotifyMonitor = NULL;
SYSTEM_POWER_CAPABILITIES   g_pwrCaps;
bool            g_fSleepState = false;

INT_PTR CALLBACK ChooseDeviceDlgProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam);


INT WINAPI wWinMain(_In_ HINSTANCE hInstance, _In_opt_ HINSTANCE /*hPrevInstance*/, _In_ LPWSTR /*lpCmdLine*/, _In_ INT nCmdShow)
{
    bool bCoInit = false, bMFStartup = false;

    // Initialize the common controls
    const INITCOMMONCONTROLSEX icex = { sizeof(INITCOMMONCONTROLSEX), ICC_WIN95_CLASSES };
    InitCommonControlsEx(&icex); 

    // Note: The shell common File dialog requires apartment threading.
    HRESULT hr = CoInitializeEx(NULL, COINIT_APARTMENTTHREADED | COINIT_DISABLE_OLE1DDE);
    if (FAILED(hr))
    {
        goto done;
    }
    bCoInit = true;

    hr = MFStartup(MF_VERSION);
    if (FAILED(hr))
    {
        goto done;
    }

    bMFStartup = true;

    HWND hwnd = CreateMainWindow(hInstance);
    if (hwnd == 0)
    {
        ShowError(NULL, L"CreateMainWindow failed.", hr);
        goto done;
    }

    ShowWindow(hwnd, nCmdShow);

    // Run the message loop.

    MSG msg;
    while (GetMessage(&msg, NULL, 0, 0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

done:
    if (FAILED(hr))
    {
        ShowError(NULL, L"Failed to start application", hr);
    }
    if (bMFStartup)
    {
        MFShutdown();
    }
    if (bCoInit)
    {
        CoUninitialize();
    }
    return 0;
}


// Dialog functions

HRESULT OnInitDialog(HWND hwnd, ChooseDeviceParam *pParam);
HRESULT OnOK(HWND hwnd, ChooseDeviceParam *pParam);

// Window procedure for the "Choose Device" dialog.

INT_PTR CALLBACK ChooseDeviceDlgProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
    static ChooseDeviceParam *pParam = NULL;

    switch (msg)
    {
    case WM_INITDIALOG:
        pParam = (ChooseDeviceParam*)lParam;
        OnInitDialog(hwnd, pParam);
        return TRUE;

    case WM_COMMAND:
        switch(LOWORD(wParam))
        {
        case IDOK:
            OnOK(hwnd, pParam);
            EndDialog(hwnd, LOWORD(wParam));
            return TRUE;

        case IDCANCEL:
            EndDialog(hwnd, LOWORD(wParam));
            return TRUE;
        }
        break;
    }

    return FALSE;
}

// Handler for WM_INITDIALOG

HRESULT OnInitDialog(HWND hwnd, ChooseDeviceParam *pParam)
{
    HRESULT hr = S_OK;

    HWND hList = GetDlgItem(hwnd, IDC_DEVICE_LIST);

    // Display a list of the devices.

    for (DWORD i = 0; i < pParam->count; i++)
    {
        WCHAR *szFriendlyName = NULL;
        UINT32 cchName;

        hr = pParam->ppDevices[i]->GetAllocatedString(MF_DEVSOURCE_ATTRIBUTE_FRIENDLY_NAME,
            &szFriendlyName, &cchName);
        if (FAILED(hr))
        {
            break;
        }

        int index = ListBox_AddString(hList, szFriendlyName);

        ListBox_SetItemData(hList, index, i);

        CoTaskMemFree(szFriendlyName);
    }

    // Assume no selection for now.
    pParam->selection = (UINT32)-1;

    if (pParam->count == 0)
    {
        // If there are no devices, disable the "OK" button.
        EnableWindow(GetDlgItem(hwnd, IDOK), FALSE);
    }
    else
    {
        // Select the first device in the list.
        ListBox_SetCurSel(hList, 0);
    }

    return hr;
}

// Handler for the OK button

HRESULT OnOK(HWND hwnd, ChooseDeviceParam *pParam)
{
    HWND hList = GetDlgItem(hwnd, IDC_DEVICE_LIST);

    // Get the current selection and return it to the application.
    int sel = ListBox_GetCurSel(hList);

    if (sel != LB_ERR)
    {
        pParam->selection = (UINT32)ListBox_GetItemData(hList, sel);
    }

    return S_OK;
}


HWND CreateStatusBar(HWND hParent, UINT nID)
{
    return CreateStatusWindow(WS_CHILD | WS_VISIBLE, L"", hParent, nID);
}

BOOL StatusSetText(HWND hwnd, int iPart, const TCHAR* szText, BOOL bNoBorders = FALSE, BOOL bPopOut = FALSE)
{
    UINT flags = 0;
    if (bNoBorders) 
    { 
        flags |= SBT_NOBORDERS;
    }
    if (bPopOut)
    {
        flags |= SBT_POPOUT;
    }

    return (BOOL)SendMessage(hwnd, SB_SETTEXT, (WPARAM)(iPart | flags), (LPARAM)szText);
}



// Implements the window procedure for the main application window.

namespace MainWindow
{
    HWND hPreview = NULL;
    HWND hStatus = NULL;
    bool bRecording = false;
    bool bPreviewing = false;
    IMFActivate* pSelectedDevice = NULL;
     
    wchar_t PhotoFileName[MAX_PATH];

    inline void _SetStatusText(const WCHAR *szStatus)
    {
        StatusSetText(hStatus, 0, szStatus);
    }

    void OnChooseDevice(HWND hwnd);
    BOOL OnCreate(HWND hwnd, LPCREATESTRUCT lpCreateStruct);
    void OnPaint(HWND hwnd);
    void OnSize(HWND hwnd, UINT state, int cx, int cy);
    void OnDestroy(HWND hwnd);
    void OnChooseDevice(HWND hwnd);
    void OnStartRecord(HWND hwnd);
    void OnStopRecord(HWND hwnd);
    void OnCommand(HWND hwnd, int id, HWND hwndCtl, UINT codeNotify);

    void UpdateUI(HWND hwnd)
    {
        if (g_pEngine->IsRecording() != bRecording)
        {
            bRecording = g_pEngine->IsRecording();
            if (bRecording)
            {
                SetMenuItemText(GetMenu(hwnd), ID_CAPTURE_RECORD, L"Stop Recording");
            }
            else
            {
                SetMenuItemText(GetMenu(hwnd), ID_CAPTURE_RECORD, L"Start Recording");
            }
        }

        if (g_pEngine->IsPreviewing() != bPreviewing)
        {
            bPreviewing = g_pEngine->IsPreviewing();
            if (bPreviewing)
            {
                SetMenuItemText(GetMenu(hwnd), ID_CAPTURE_PREVIEW, L"Stop Preview");
            }
            else
            {
                SetMenuItemText(GetMenu(hwnd), ID_CAPTURE_PREVIEW, L"Start Preview");
            }
        }
        BOOL bEnableRecording = TRUE;
        BOOL bEnablePhoto = TRUE;

        if (bRecording)
        {
            _SetStatusText(L"Recording");
        }
        else if (g_pEngine->IsPreviewing())
        {
            _SetStatusText(L"Previewing");
        }
        else
        {
            _SetStatusText(L"Please select a device or start preview (using the default device).");
            bEnableRecording = FALSE;
        }

        if (!g_pEngine->IsPreviewing() || g_pEngine->IsPhotoPending())
        {
            bEnablePhoto = FALSE;
        }

        EnableMenuItem(GetMenu(hwnd), ID_CAPTURE_RECORD, bEnableRecording ? MF_ENABLED : MF_GRAYED);
        EnableMenuItem(GetMenu(hwnd), ID_CAPTURE_TAKEPHOTO, bEnablePhoto ? MF_ENABLED : MF_GRAYED);
    }


    BOOL OnCreate(HWND hwnd, LPCREATESTRUCT /*lpCreateStruct*/)
    {
        BOOL                fSuccess = FALSE;
        IMFAttributes*      pAttributes = NULL;
        HRESULT             hr = S_OK;

        hPreview = CreatePreviewWindow(GetModuleHandle(NULL), hwnd);
        if (hPreview == NULL)
        {
            goto done;
        }

        hStatus = CreateStatusBar(hwnd, IDC_STATUS_BAR);
        if (hStatus == NULL)
        {
            goto done;
        }

        if (FAILED(CaptureManager::CreateInstance(hwnd, &g_pEngine)))
        {
            goto done;
        }
    
        hr = g_pEngine->InitializeCaptureManager(hPreview, pSelectedDevice);  
        if (FAILED(hr))
        {
            ShowError(hwnd, IDS_ERR_SET_DEVICE, hr);
            goto done;
        }

        // Register for connected standy changes.  This should come through the normal
        // WM_POWERBROADCAST messages that we're already handling below.
        // We also want to hook into the monitor on/off notification for AOAC (SOC) systems.
        g_hPowerNotify = RegisterSuspendResumeNotification((HANDLE)hwnd, DEVICE_NOTIFY_WINDOW_HANDLE);
        g_hPowerNotifyMonitor = RegisterPowerSettingNotification((HANDLE)hwnd, &GUID_MONITOR_POWER_ON, DEVICE_NOTIFY_WINDOW_HANDLE);
        ZeroMemory(&g_pwrCaps, sizeof(g_pwrCaps));
        GetPwrCapabilities(&g_pwrCaps);

        UpdateUI(hwnd);
        fSuccess = TRUE;

    done:
        SafeRelease(&pAttributes);
        return fSuccess;
    }

    void OnPaint(HWND hwnd)
    {
        PAINTSTRUCT ps;
        HDC hdc = BeginPaint(hwnd, &ps);

        FillRect(hdc, &ps.rcPaint, (HBRUSH) (COLOR_WINDOW+1));

        EndPaint(hwnd, &ps);
    }


    void OnSize(HWND /*hwnd*/, UINT state, int cx, int cy)
    {        
        if (state == SIZE_RESTORED || state == SIZE_MAXIMIZED)
        {
            // Resize the status bar.
            SendMessageW(hStatus, WM_SIZE, 0, 0);

            // Resize the preview window.
            RECT statusRect;
            SendMessageW(hStatus, SB_GETRECT, 0, (LPARAM)&statusRect);
            cy -= (statusRect.bottom - statusRect.top);
            
            MoveWindow(hPreview, 0, 0, cx, cy, TRUE);
        }        
    }

    void OnDestroy(HWND hwnd)
    {
        delete g_pEngine;
        g_pEngine = NULL;
        if (g_hPowerNotify)
        {
            UnregisterSuspendResumeNotification (g_hPowerNotify);
            g_hPowerNotify = NULL;
        }
        PostQuitMessage(0);
    }

    void OnChooseDevice(HWND hwnd)
    {
        ChooseDeviceParam param;

        IMFAttributes *pAttributes = NULL;

        HRESULT hr = MFCreateAttributes(&pAttributes, 1);
        if (FAILED(hr))
        {
            goto done;
        }

        // Ask for source type = video capture devices
        hr = pAttributes->SetGUID(MF_DEVSOURCE_ATTRIBUTE_SOURCE_TYPE,
                MF_DEVSOURCE_ATTRIBUTE_SOURCE_TYPE_VIDCAP_GUID);
        if (FAILED(hr))
        {
            goto done;
        }

        // Enumerate devices.
        hr = MFEnumDeviceSources(pAttributes, &param.ppDevices, &param.count);
        if (FAILED(hr))
        {
            goto done;
        }

        // Ask the user to select one.
        INT_PTR result = DialogBoxParam(GetModuleHandle(NULL),
            MAKEINTRESOURCE(IDD_CHOOSE_DEVICE), hwnd,
            ChooseDeviceDlgProc, (LPARAM)&param);

        if ((result == IDOK) && (param.selection != (UINT32)-1))
        {
            UINT iDevice = param.selection;

            if (iDevice >= param.count)
            {
                hr = E_UNEXPECTED;
                goto done;
            }

            hr = g_pEngine->InitializeCaptureManager(hPreview, param.ppDevices[iDevice]);
            if (FAILED(hr))
            {
                goto done;
            }
            SafeRelease(&pSelectedDevice);
            pSelectedDevice = param.ppDevices[iDevice];
            pSelectedDevice->AddRef();
        }

    done:
        SafeRelease(&pAttributes);
        if (FAILED(hr))
        {
            ShowError(hwnd, IDS_ERR_SET_DEVICE, hr);
        }
        UpdateUI(hwnd);
    }


    void OnStartRecord(HWND hwnd)
    {
        IFileSaveDialog *pFileSave = NULL;
        IShellItem *pItem = NULL;
        PWSTR pszFileName = NULL;

        HRESULT hr = CoCreateInstance(CLSID_FileSaveDialog, NULL, CLSCTX_INPROC_SERVER, IID_PPV_ARGS(&pFileSave));
        if (FAILED(hr))
        {
            goto done;
        }
        hr = pFileSave->SetTitle(L"Select File Name");
        if (FAILED(hr))
        {
            goto done;
        }

        hr = pFileSave->SetFileName(L"MyVideo.mp4");
        if (FAILED(hr))
        {
            goto done;
        }

        hr = pFileSave->SetDefaultExtension(L"mp4");
        if (FAILED(hr))
        {
            goto done;
        }

        const COMDLG_FILTERSPEC rgSpec[] =
        { 
            { L"MP4 (H.264/AAC)", L"*.mp4" },
            { L"Windows Media Video", L"*.wmv" },
            { L"All Files", L"*.*" },
        };
        hr = pFileSave->SetFileTypes(ARRAYSIZE(rgSpec), rgSpec);
        if (FAILED(hr))
        {
            goto done;
        }

        hr = pFileSave->Show(hwnd);
        if (hr == HRESULT_FROM_WIN32(ERROR_CANCELLED))
        {
            hr = S_OK;      // The user canceled the dialog.
            goto done;
        }
        if (FAILED(hr))
        {
            goto done;
        }

        hr = pFileSave->GetResult(&pItem);
        if (FAILED(hr))
        {
            goto done;
        }

        hr = pItem->GetDisplayName(SIGDN_FILESYSPATH, &pszFileName);
        if (FAILED(hr))
        {
            goto done;
        }

        hr = g_pEngine->StartRecord(pszFileName);
        if (FAILED(hr))
        {
            goto done;
        }

done:
        CoTaskMemFree(pszFileName);
        SafeRelease(&pItem);
        SafeRelease(&pFileSave);

        if (FAILED(hr))
        {
            ShowError(hwnd, IDS_ERR_RECORD, hr);
        }
        UpdateUI(hwnd);
    }

    void OnStopRecord(HWND hwnd)
    {
        HRESULT hr = g_pEngine->StopRecord();
        if (FAILED(hr))
        {
            ShowError(hwnd, IDS_ERR_RECORD, hr);
        }
        UpdateUI(hwnd);
    }
    void OnStopPreview(HWND hwnd)
    {
        HRESULT hr = g_pEngine->StopPreview();
        if (FAILED(hr))
        {
            ShowError(hwnd, IDS_ERR_RECORD, hr);
        }
        UpdateUI(hwnd);
    }
    void OnStartPreview (HWND hwnd)
    {
        HRESULT hr = g_pEngine->StartPreview();
        if (FAILED(hr))
        {
            ShowError(hwnd, IDS_ERR_RECORD, hr);
        }
        UpdateUI(hwnd);
    }
    void OnTakePhoto(HWND hwnd)
    {
        wchar_t filename[MAX_PATH];

        // Get the path to the Documents folder.
        IShellItem *psi = NULL;
        PWSTR pszFolderPath = NULL;

        HRESULT hr = SHCreateItemInKnownFolder(FOLDERID_Documents, 0, NULL, IID_PPV_ARGS(&psi));
        if (FAILED(hr))
        {
            goto done;
        }

        hr = psi->GetDisplayName(SIGDN_FILESYSPATH, &pszFolderPath);
        if (FAILED(hr))
        {
            goto done;
        }

        // Construct a file name based on the current time.

        SYSTEMTIME time;
        GetLocalTime(&time);

        hr = StringCchPrintf(filename, MAX_PATH, L"MyPhoto%04u_%02u%02u_%02u%02u%02u.jpg",
            time.wYear, time.wMonth, time.wDay, time.wHour, time.wMinute, time.wSecond);
        if (FAILED(hr))
        {
            goto done;
        }

        LPTSTR path = PathCombine(PhotoFileName, pszFolderPath, filename);
        if (path == NULL)
        {
            hr = E_FAIL;
            goto done;
        }

        hr = g_pEngine->TakePhoto(path);
        if (FAILED(hr))
        {
            goto done;
        }

        _SetStatusText(path);

done:
        SafeRelease(&psi);
        CoTaskMemFree(pszFolderPath);

        if (FAILED(hr))
        {
            ShowError(hwnd, IDS_ERR_PHOTO, hr);
        }
        UpdateUI(hwnd);
    }
    
    void OnCommand(HWND hwnd, int id, HWND /*hwndCtl*/, UINT /*codeNotify*/)
    {
        switch (id)
        {
        case ID_CAPTURE_CHOOSEDEVICE:
            OnChooseDevice(hwnd);
            break;

        case ID_CAPTURE_RECORD:
            if (g_pEngine->IsRecording())
            {
                OnStopRecord(hwnd);
            }
            else
            {
                OnStartRecord(hwnd);
            }
            break;

        case ID_CAPTURE_TAKEPHOTO:
            OnTakePhoto(hwnd);
            break;
        case ID_CAPTURE_PREVIEW:
            if (g_pEngine->IsPreviewing())
            {
                OnStopPreview(hwnd);
            }
            else
            {
                OnStartPreview(hwnd);
            }
            break;
        }
    }


    LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
    {
        switch (uMsg)
        {
        HANDLE_MSG(hwnd, WM_CREATE,  OnCreate);
        HANDLE_MSG(hwnd, WM_PAINT,   OnPaint);
        HANDLE_MSG(hwnd, WM_SIZE,    OnSize);
        HANDLE_MSG(hwnd, WM_DESTROY, OnDestroy);
        HANDLE_MSG(hwnd, WM_COMMAND, OnCommand);

        case WM_ERASEBKGND:
            return 1;

        case WM_APP_CAPTURE_EVENT:
            {
                if (g_pEngine)
                {
                    HRESULT hr = g_pEngine->OnCaptureEvent(wParam, lParam);
                    if (FAILED(hr))
                    {
                        ShowError(hwnd, g_pEngine->ErrorID(), hr);
                        InvalidateRect(hwnd, NULL, FALSE);
                    }
                }

                UpdateUI(hwnd);
            }
            return 0;
        case WM_POWERBROADCAST:
            {
                switch (wParam)
                {
                case PBT_APMSUSPEND:
                    DbgPrint(L"++WM_POWERBROADCAST++ Stopping both preview & record stream.\n");
                    g_fSleepState = true;
                    g_pEngine->SleepState(g_fSleepState);
                    g_pEngine->StopRecord();
                    g_pEngine->StopPreview();
                    g_pEngine->DestroyCaptureEngine();
                    DbgPrint(L"++WM_POWERBROADCAST++ streams stopped, capture engine destroyed.\n");
                    break;
                case PBT_APMRESUMEAUTOMATIC:
                    DbgPrint(L"++WM_POWERBROADCAST++ Reinitializing capture engine.\n");
                    g_fSleepState = false;
                    g_pEngine->SleepState(g_fSleepState);
                    g_pEngine->InitializeCaptureManager(hPreview, pSelectedDevice);
                    break;
                case PBT_POWERSETTINGCHANGE:
                    {
                        // We should only be in here for GUID_MONITOR_POWER_ON.
                        POWERBROADCAST_SETTING* pSettings = (POWERBROADCAST_SETTING*)lParam;

                        // If this is a SOC system (AoAc is true), we want to check our current
                        // sleep state and based on whether the monitor is being turned on/off,
                        // we can turn off our media streams and/or re-initialize the capture
                        // engine.
                        if (pSettings != NULL && g_pwrCaps.AoAc && pSettings->PowerSetting == GUID_MONITOR_POWER_ON)
                        {
                            DWORD   dwData = *((DWORD*)pSettings->Data);
                            if (dwData == 0 && !g_fSleepState)
                            {
                                // This is a AOAC machine, and we're about to turn off our monitor, let's stop recording/preview.
                                DbgPrint(L"++WM_POWERBROADCAST++ Stopping both preview & record stream.\n");
                                g_fSleepState = true;
                                g_pEngine->SleepState(g_fSleepState);
                                g_pEngine->StopRecord();
                                g_pEngine->StopPreview();
                                g_pEngine->DestroyCaptureEngine();
                                DbgPrint(L"++WM_POWERBROADCAST++ streams stopped, capture engine destroyed.\n");
                            }
                            else if (dwData != 0 && g_fSleepState)
                            {
                                DbgPrint(L"++WM_POWERBROADCAST++ Reinitializing capture engine.\n");
                                g_fSleepState = false;
                                g_pEngine->SleepState(g_fSleepState);
                                g_pEngine->InitializeCaptureManager(hPreview, pSelectedDevice);
                            }
                        }
                    }
                    break;
                case PBT_APMRESUMESUSPEND:
                default:
                    // Don't care about this one, we always get the resume automatic so just
                    // latch onto that one.
                    DbgPrint(L"++WM_POWERBROADCAST++ (wParam=%u,lParam=%u)\n", wParam, lParam);
                    break;
                }
            }
            return 1;
        }
        return DefWindowProc(hwnd, uMsg, wParam, lParam);
    }
};

HWND CreateMainWindow(HINSTANCE hInstance)
{
    // Register the window class.
    const wchar_t CLASS_NAME[]  = L"Capture Engine Window Class";
    
    WNDCLASS wc = { };

    wc.lpfnWndProc   = MainWindow::WindowProc;
    wc.hInstance     = hInstance;
    wc.lpszClassName = CLASS_NAME;
    wc.lpszMenuName  = MAKEINTRESOURCE(IDR_MENU1);

    RegisterClass(&wc);

    // Create the window.
    return CreateWindowEx(0, CLASS_NAME, L"Capture Application",
        WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT,
        NULL, NULL, hInstance, NULL);
};