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#include "camera-names.hpp"
#include <algorithm>
#include <iterator>
#ifdef _WIN32
# include <cwchar>
# define NO_DSHOW_STRSAFE
# include <dshow.h>
#elif defined(__unix) || defined(__linux__) || defined(__APPLE__)
# include <unistd.h>
#endif
#ifdef __APPLE__
# include <QCameraInfo>
#endif
#ifdef __linux__
# include <fcntl.h>
# include <sys/ioctl.h>
# include <linux/videodev2.h>
# include <cerrno>
# include <cstring>
#endif
#include <QDebug>
int camera_name_to_index(const QString &name)
{
auto list = get_camera_names();
auto it = std::find_if(list.cbegin(), list.cend(), [&name](const auto& tuple) {
const auto& [str, idx] = tuple;
return str == name;
});
if (it != list.cend())
{
const auto& [ str, idx ] = *it;
return idx;
}
return -1;
}
std::vector<std::tuple<QString, int>> get_camera_names()
{
std::vector<std::tuple<QString, int>> ret;
#ifdef _WIN32
// Create the System Device Enumerator.
HRESULT hr;
CoInitialize(nullptr);
ICreateDevEnum *pSysDevEnum = nullptr;
hr = CoCreateInstance(CLSID_SystemDeviceEnum, nullptr, CLSCTX_INPROC_SERVER, IID_ICreateDevEnum, (void **)&pSysDevEnum);
if (FAILED(hr))
{
qDebug() << "failed CLSID_SystemDeviceEnum" << hr;
return ret;
}
// Obtain a class enumerator for the video compressor category.
IEnumMoniker *pEnumCat = nullptr;
hr = pSysDevEnum->CreateClassEnumerator(CLSID_VideoInputDeviceCategory, &pEnumCat, 0);
if (hr == S_OK) {
// Enumerate the monikers.
IMoniker *pMoniker = nullptr;
ULONG cFetched;
while (pEnumCat->Next(1, &pMoniker, &cFetched) == S_OK)
{
IPropertyBag *pPropBag;
hr = pMoniker->BindToStorage(nullptr, nullptr, IID_IPropertyBag, (void **)&pPropBag);
if (SUCCEEDED(hr)) {
// To retrieve the filter's friendly name, do the following:
VARIANT var;
VariantInit(&var);
hr = pPropBag->Read(L"FriendlyName", &var, nullptr);
if (SUCCEEDED(hr))
{
// Display the name in your UI somehow.
QString str((QChar*)var.bstrVal, int(std::wcslen(var.bstrVal)));
ret.push_back({ str, ret.size() });
}
VariantClear(&var);
pPropBag->Release();
}
pMoniker->Release();
}
pEnumCat->Release();
}
else
qDebug() << "failed CLSID_VideoInputDeviceCategory" << hr;
pSysDevEnum->Release();
#endif
#ifdef __linux__
for (int i = 0; i < 16; i++) {
char buf[32];
snprintf(buf, sizeof(buf), "/dev/video%d", i);
if (access(buf, R_OK | W_OK) == 0) {
int fd = open(buf, O_RDONLY);
if (fd == -1)
continue;
struct v4l2_capability video_cap;
if(ioctl(fd, VIDIOC_QUERYCAP, &video_cap) == -1)
{
qDebug() << "VIDIOC_QUERYCAP" << errno;
close(fd);
continue;
}
ret.push_back({ QString((const char*)video_cap.card), i});
close(fd);
}
}
#endif
#ifdef __APPLE__
QList<QCameraInfo> cameras = QCameraInfo::availableCameras();
for (const QCameraInfo &cameraInfo : cameras)
ret.push_back({ cameraInfo.description(), ret.size() });
#endif
return ret;
}
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