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/* Copyright (c) 2012 Patrick Ruoff
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*/
#if defined(OPENTRACK_API) && defined(_WIN32)
#include <windows.h>
#include <dshow.h>
#endif
#include "camera.h"
#include <string>
#include <QDebug>
using namespace cv;
#if defined(OPENTRACK_API) && (defined(__unix) || defined(__linux) || defined(__APPLE__))
#include <unistd.h>
#endif
#ifdef OPENTRACK_API
void get_camera_device_names(std::vector<std::string>& device_names) {
# if defined(_WIN32)
// Create the System Device Enumerator.
HRESULT hr;
ICreateDevEnum *pSysDevEnum = NULL;
hr = CoCreateInstance(CLSID_SystemDeviceEnum, NULL, CLSCTX_INPROC_SERVER, IID_ICreateDevEnum, (void **)&pSysDevEnum);
if (FAILED(hr))
{
return;
}
// Obtain a class enumerator for the video compressor category.
IEnumMoniker *pEnumCat = NULL;
hr = pSysDevEnum->CreateClassEnumerator(CLSID_VideoInputDeviceCategory, &pEnumCat, 0);
if (hr == S_OK) {
// Enumerate the monikers.
IMoniker *pMoniker = NULL;
ULONG cFetched;
while (pEnumCat->Next(1, &pMoniker, &cFetched) == S_OK) {
IPropertyBag *pPropBag;
hr = pMoniker->BindToStorage(0, 0, IID_IPropertyBag, (void **)&pPropBag);
if (SUCCEEDED(hr)) {
// To retrieve the filter's friendly name, do the following:
VARIANT varName;
VariantInit(&varName);
hr = pPropBag->Read(L"FriendlyName", &varName, 0);
if (SUCCEEDED(hr))
{
auto wstr = std::wstring(varName.bstrVal);
auto str = std::string(wstr.begin(), wstr.end());
device_names.push_back(str);
}
VariantClear(&varName);
////// To create an instance of the filter, do the following:
////IBaseFilter *pFilter;
////hr = pMoniker->BindToObject(NULL, NULL, IID_IBaseFilter,
//// (void**)&pFilter);
// Now add the filter to the graph.
//Remember to release pFilter later.
pPropBag->Release();
}
pMoniker->Release();
}
pEnumCat->Release();
}
pSysDevEnum->Release();
# else
for (int i = 0; i < 16; i++) {
char buf[128];
sprintf(buf, "/dev/video%d", i);
if (access(buf, R_OK | W_OK) == 0) {
device_names.push_back(std::string(buf));
}
}
# endif
}
#else
// ----------------------------------------------------------------------------
void get_camera_device_names(std::vector<std::string>& device_names)
{
videoInput VI;
VI.listDevices();
std::string device_name;
for(int index = 0; ; ++index) {
device_name = VI.getDeviceName(index);
if (device_name.empty()) break;
device_names.push_back(device_name);
}
}
#endif
// ----------------------------------------------------------------------------
void Camera::set_device_index(int index)
{
if (desired_index != index)
{
desired_index = index;
_set_device_index();
// reset fps
dt_valid = 0;
dt_mean = 0;
active_index = index;
}
}
void Camera::set_fps(int fps)
{
if (cam_desired.fps != fps)
{
cam_desired.fps = fps;
_set_fps();
}
}
void Camera::set_res(int x_res, int y_res)
{
if (cam_desired.res_x != x_res || cam_desired.res_y != y_res)
{
cam_desired.res_x = x_res;
cam_desired.res_y = y_res;
_set_res();
_set_fps();
}
}
bool Camera::get_frame(float dt, cv::Mat* frame)
{
bool new_frame = _get_frame(frame);
// measure fps of valid frames
const float dt_smoothing_const = 0.9;
dt_valid += dt;
if (new_frame)
{
dt_mean = dt_smoothing_const * dt_mean + (1.0 - dt_smoothing_const) * dt_valid;
cam_info.fps = dt_mean > 1e-3 ? 1.0 / dt_mean : 0;
dt_valid = 0;
}
return new_frame;
}
void CVCamera::start()
{
cap = new VideoCapture(desired_index);
// extract camera info
if (cap->isOpened())
{
_set_fps();
_set_res();
active = true;
active_index = desired_index;
cam_info.res_x = cap->get(CV_CAP_PROP_FRAME_WIDTH);
cam_info.res_y = cap->get(CV_CAP_PROP_FRAME_HEIGHT);
} else {
delete cap;
cap = nullptr;
}
}
void CVCamera::stop()
{
if (cap)
{
cap->release();
delete cap;
}
active = false;
}
bool CVCamera::_get_frame(Mat* frame)
{
if (cap && cap->isOpened())
{
Mat img;
for (int i = 0; i < 100 && !cap->read(img); i++)
;;
if (img.empty())
return false;
*frame = img;
return true;
}
return false;
}
void CVCamera::_set_fps()
{
if (cap) cap->set(CV_CAP_PROP_FPS, cam_desired.fps);
}
void CVCamera::_set_res()
{
if (cap)
{
cap->set(CV_CAP_PROP_FRAME_WIDTH, cam_desired.res_x);
cap->set(CV_CAP_PROP_FRAME_HEIGHT, cam_desired.res_y);
cam_info.res_x = cap->get(CV_CAP_PROP_FRAME_WIDTH);
cam_info.res_y = cap->get(CV_CAP_PROP_FRAME_HEIGHT);
}
}
void CVCamera::_set_device_index()
{
if (cap)
{
cap->release();
delete cap;
}
cap = new VideoCapture(desired_index);
}
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