| Es++ Class: OpenCVVideoCapture |
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* OpenCVVideoCapture.h
*
*****************************************************************************/
// 2017/08/10
// On cv::VideoCapture
// See: http://docs.opencv.org/trunk/d8/dfe/classcv_1_1VideoCapture.html
#pragma once
#include <es++/opencv-4.0/OpenCVObject.h>
#include <es++/opencv-4.0/OpenCVApplication.h>
namespace Es {
class OpenCVVideoCapture :public OpenCVObject {
private:
cv::VideoCapture videoCapture;
int read_retry_count;
static const int MAX_READ_RETRY_COUNT = 5;
public:
//Constructor
OpenCVVideoCapture(int retry_count = MAX_READ_RETRY_COUNT)
:read_retry_count(retry_count)
{
}
~OpenCVVideoCapture()
{
close();
}
double getProperty(int prop)
{
double value = 0.0;
if (isOpened()) {
value = videoCapture.get(prop);
}
return value;
}
bool setProperty(int prop, double value)
{
bool rc = false;
if (isOpened()) {
rc = videoCapture.set(prop, value);
}
return rc;
}
void open(int deviceIndex)
{
//close();
if (videoCapture.open(deviceIndex)) {
if (!isOpened()) {
throw IException("Failed to open deviceIndex=%d", deviceIndex);
}
}
}
void open(const std::string& filename)
{
//close();
if (videoCapture.open(filename)) {
if (!isOpened()) {
throw IException("Failed to open file=%d", filename.c_str());
}
}
}
void close()
{
if (isOpened()) {
videoCapture.release();
}
}
bool read(cv::Mat& frame)
{
bool rc = false;
if (isOpened() ) {
rc = videoCapture.read(frame);
/*
//for (int i = 0; i<read_retry_count; i++) {
if (videoCapture.read(frame)) {
if (frame.empty()) {
//If the frame is empty, try to read until to get a
// nonempty frame;
continue;
} else {
rc = true;
break;
}
// }
}
*/
}
return rc;
}
bool isOpened()
{
return videoCapture.isOpened();
}
cv::VideoCapture& getVideoCapture()
{
return videoCapture;
}
bool getVideoFrameSize(int& w, int& h)
{
bool rc = false;
w = 0;
h = 0;
if (isOpened()) {
w = (int)videoCapture.get(CAP_PROP_FRAME_WIDTH);
h = (int)videoCapture.get(CAP_PROP_FRAME_HEIGHT);
rc = true;
}
return rc;
}
bool setVideoFrameSize(int w, int h)
{
bool rc = false;
if (isOpened()) {
videoCapture.set(CAP_PROP_FRAME_WIDTH, (double)w);
videoCapture.set(CAP_PROP_FRAME_HEIGHT, (double)h);
rc = false;
}
return rc;
}
};
}