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// Copyright (C) 2022 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include "qwindowsvideodevices_p.h"
#include <private/qcameradevice_p.h>
#include <private/qwindowsmfdefs_p.h>
#include <private/qwindowsmultimediautils_p.h>
#include <private/qcomptr_p.h>
#include <dbt.h>
#include <mfapi.h>
#include <mfreadwrite.h>
#include <mferror.h>
QT_BEGIN_NAMESPACE
LRESULT QT_WIN_CALLBACK deviceNotificationWndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
if (message == WM_DEVICECHANGE) {
auto b = (PDEV_BROADCAST_HDR)lParam;
if (b && b->dbch_devicetype == DBT_DEVTYP_DEVICEINTERFACE) {
auto wmd = reinterpret_cast<QWindowsVideoDevices *>(GetWindowLongPtr(hWnd, GWLP_USERDATA));
if (wmd) {
if (wParam == DBT_DEVICEARRIVAL || wParam == DBT_DEVICEREMOVECOMPLETE) {
wmd->videoInputsChanged();
}
}
}
}
return 1;
}
static const auto windowClassName = TEXT("QWindowsMediaDevicesMessageWindow");
static HWND createMessageOnlyWindow()
{
WNDCLASSEX wx = {};
wx.cbSize = sizeof(WNDCLASSEX);
wx.lpfnWndProc = deviceNotificationWndProc;
wx.hInstance = GetModuleHandle(nullptr);
wx.lpszClassName = windowClassName;
if (!RegisterClassEx(&wx))
return nullptr;
auto hwnd = CreateWindowEx(0, windowClassName, TEXT("Message"),
0, 0, 0, 0, 0, HWND_MESSAGE, nullptr, nullptr, nullptr);
if (!hwnd) {
UnregisterClass(windowClassName, GetModuleHandle(nullptr));
return nullptr;
}
return hwnd;
}
QWindowsVideoDevices::QWindowsVideoDevices(QPlatformMediaIntegration *integration)
: QPlatformVideoDevices(integration)
{
CoInitialize(nullptr);
m_videoDeviceMsgWindow = createMessageOnlyWindow();
if (m_videoDeviceMsgWindow) {
SetWindowLongPtr(m_videoDeviceMsgWindow, GWLP_USERDATA, (LONG_PTR)this);
DEV_BROADCAST_DEVICEINTERFACE di = {};
di.dbcc_size = sizeof(di);
di.dbcc_devicetype = DBT_DEVTYP_DEVICEINTERFACE;
di.dbcc_classguid = QMM_KSCATEGORY_VIDEO_CAMERA;
m_videoDeviceNotification =
RegisterDeviceNotification(m_videoDeviceMsgWindow, &di, DEVICE_NOTIFY_WINDOW_HANDLE);
if (!m_videoDeviceNotification) {
DestroyWindow(m_videoDeviceMsgWindow);
m_videoDeviceMsgWindow = nullptr;
UnregisterClass(windowClassName, GetModuleHandle(nullptr));
}
}
if (!m_videoDeviceNotification) {
qWarning() << "Video device change notification disabled";
}
}
QWindowsVideoDevices::~QWindowsVideoDevices()
{
if (m_videoDeviceNotification) {
UnregisterDeviceNotification(m_videoDeviceNotification);
}
if (m_videoDeviceMsgWindow) {
DestroyWindow(m_videoDeviceMsgWindow);
UnregisterClass(windowClassName, GetModuleHandle(nullptr));
}
CoUninitialize();
}
static std::optional<QCameraFormat> createCameraFormat(IMFMediaType *mediaFormat)
{
GUID subtype = GUID_NULL;
if (FAILED(mediaFormat->GetGUID(MF_MT_SUBTYPE, &subtype)))
return {};
auto pixelFormat = QWindowsMultimediaUtils::pixelFormatFromMediaSubtype(subtype);
if (pixelFormat == QVideoFrameFormat::Format_Invalid)
return {};
UINT32 width = 0u;
UINT32 height = 0u;
if (FAILED(MFGetAttributeSize(mediaFormat, MF_MT_FRAME_SIZE, &width, &height)))
return {};
QSize resolution{ int(width), int(height) };
UINT32 num = 0u;
UINT32 den = 0u;
float minFr = 0.f;
float maxFr = 0.f;
if (SUCCEEDED(MFGetAttributeRatio(mediaFormat, MF_MT_FRAME_RATE_RANGE_MIN, &num, &den)))
minFr = float(num) / float(den);
if (SUCCEEDED(MFGetAttributeRatio(mediaFormat, MF_MT_FRAME_RATE_RANGE_MAX, &num, &den)))
maxFr = float(num) / float(den);
auto *f = new QCameraFormatPrivate{ QSharedData(), pixelFormat, resolution, minFr, maxFr };
return f->create();
}
static QString getString(IMFActivate *device, const IID &id)
{
WCHAR *str = NULL;
UINT32 length = 0;
HRESULT hr = device->GetAllocatedString(id, &str, &length);
if (SUCCEEDED(hr)) {
auto qstr = QString::fromWCharArray(str);
CoTaskMemFree(str);
return qstr;
} else {
return {};
}
}
static std::optional<QCameraDevice> createCameraDevice(IMFActivate *device)
{
auto info = std::make_unique<QCameraDevicePrivate>();
info->description = getString(device, MF_DEVSOURCE_ATTRIBUTE_FRIENDLY_NAME);
info->id = getString(device, MF_DEVSOURCE_ATTRIBUTE_SOURCE_TYPE_VIDCAP_SYMBOLIC_LINK).toUtf8();
IMFMediaSource *source = NULL;
HRESULT hr = device->ActivateObject(IID_PPV_ARGS(&source));
if (FAILED(hr))
return {};
QComPtr<IMFSourceReader> reader;
hr = MFCreateSourceReaderFromMediaSource(source, NULL, reader.address());
if (FAILED(hr))
return {};
QList<QSize> photoResolutions;
QList<QCameraFormat> videoFormats;
for (DWORD i = 0;; ++i) {
// Loop through the supported formats for the video device
QComPtr<IMFMediaType> mediaFormat;
hr = reader->GetNativeMediaType((DWORD)MF_SOURCE_READER_FIRST_VIDEO_STREAM, i,
mediaFormat.address());
if (FAILED(hr))
break;
auto maybeCamera = createCameraFormat(mediaFormat.get());
if (maybeCamera) {
videoFormats << *maybeCamera;
photoResolutions << maybeCamera->resolution();
}
}
info->videoFormats = videoFormats;
info->photoResolutions = photoResolutions;
return info.release()->create();
}
static QList<QCameraDevice> readCameraDevices(IMFAttributes *attr)
{
QList<QCameraDevice> cameras;
UINT32 count = 0;
IMFActivate **devices = NULL;
HRESULT hr = MFEnumDeviceSources(attr, &devices, &count);
if (SUCCEEDED(hr)) {
for (UINT32 i = 0; i < count; i++) {
IMFActivate *device = devices[i];
if (device) {
auto maybeCamera = createCameraDevice(device);
if (maybeCamera)
cameras << *maybeCamera;
device->Release();
}
}
CoTaskMemFree(devices);
}
return cameras;
}
QList<QCameraDevice> QWindowsVideoDevices::videoDevices() const
{
QList<QCameraDevice> cameras;
QComPtr<IMFAttributes> attr;
HRESULT hr = MFCreateAttributes(attr.address(), 2);
if (FAILED(hr))
return {};
hr = attr->SetGUID(MF_DEVSOURCE_ATTRIBUTE_SOURCE_TYPE,
MF_DEVSOURCE_ATTRIBUTE_SOURCE_TYPE_VIDCAP_GUID);
if (SUCCEEDED(hr)) {
cameras << readCameraDevices(attr.get());
hr = attr->SetGUID(MF_DEVSOURCE_ATTRIBUTE_SOURCE_TYPE_VIDCAP_CATEGORY,
QMM_KSCATEGORY_SENSOR_CAMERA);
if (SUCCEEDED(hr))
cameras << readCameraDevices(attr.get());
}
return cameras;
}
QT_END_NAMESPACE
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