I written C++ code to display live view image on monitor. I referred to some code on stackoverflow. Finally, I complete my code, but there are some problem.
I want display live view image using opencv, but I don't know to get the width & height of live view image. (maybe it is retrieved by EDSDK function..)
please answer for me.
(I attached my code, I want suitable answer for my code)
(look at "//libjpegTurbo...//, there are manual _width & height. I want to retrieve using function)
// Functions_body
bool LiveViewStart()
{
EdsError err = EDS_ERR_OK;
EdsCameraListRef cameraList = NULL;
EdsCameraRef camera = NULL;
EdsUInt32 count = 0;
bool isSDKLoaded = false;
// Initialize SDK
err = EdsInitializeSDK();
if(err == EDS_ERR_OK)
{
isSDKLoaded = true;
}
// Acquisition of camera list
if(err == EDS_ERR_OK)
{
err = EdsGetCameraList(&cameraList);
}
// Acquisition of number of Cameras
if(err == EDS_ERR_OK)
{
err = EdsGetChildCount(cameraList, &count);
if(count == 0)
{
err = EDS_ERR_DEVICE_NOT_FOUND;
}
}
// Acquisition of camera at the head of the list
if(err == EDS_ERR_OK)
{
err = EdsGetChildAtIndex(cameraList , 0 , &camera);
}
// Acquisition of camera information
EdsDeviceInfo deviceInfo;
if(err == EDS_ERR_OK)
{
err = EdsGetDeviceInfo(camera , &deviceInfo);
if(err == EDS_ERR_OK && camera == NULL)
{
err = EDS_ERR_DEVICE_NOT_FOUND;
}
}
// Release camera list
if(cameraList != NULL)
{
EdsRelease(cameraList);
}
if(err != EDS_ERR_OK)
{
::MessageBox(NULL,"Cannot detect camera",NULL,MB_OK);
exit(1);
}
// Open session with camera
if(err == EDS_ERR_OK)
{
err = EdsOpenSession(camera);
}
// Start Live view
// Get the output device for the live view image
EdsUInt32 device;
err = EdsGetPropertyData(camera, kEdsPropID_Evf_OutputDevice, 0, sizeof(device), &device);
// PC live view starts by setting the PC as the output device for the live view image.
if(err == EDS_ERR_OK)
{
device |= kEdsEvfOutputDevice_PC;
err = EdsSetPropertyData(camera, kEdsPropID_Evf_OutputDevice, 0 , sizeof(device), &device);
}
Sleep(2000);
// Download EvfData
EdsEvfImageRef evfImage = NULL;
EdsStreamRef stream = NULL;
unsigned char* data = NULL;
unsigned long size = 0;
// Create memory stream
err = EdsCreateMemoryStream(0, &stream);
if (err != EDS_ERR_OK) {
cout << "Download Live View Image Error in Function EdsCreateMemoryStream: " << err << "\n";
return false;
}
// Create EvfImageRef.
err = EdsCreateEvfImageRef(stream, &evfImage);
if (err != EDS_ERR_OK) {
cout << "Download Live View Image Error in Function EdsCreateEvfImageRef: " << err << "\n";
return false;
}
// Download live view image data.
err = EdsDownloadEvfImage(camera, evfImage);
if (err != EDS_ERR_OK) {
cout << "Download Live View Image Error in Function EdsDownloadEvfImage: " << err << "\n";
return false;
}
//Sleep(1000);
// Get Pointer of evfStream
err = EdsGetPointer(stream, (EdsVoid**)& data);
if (err != EDS_ERR_OK) {
cout << "Download Live View Image Error in Function EdsGetPointer: " << err << "\n";
return false;
}
// Get Length of evfStream
err = EdsGetLength(stream, &size);
if (err != EDS_ERR_OK) {
cout << "Download Live View Image Error in Function EdsGetLength: " << err << "\n";
return false;
}
// libjpegTurbo(data, size);
int JPEG_QUALITY = 75;
int COLOR_COMPONENTS = 3;
int _width = 1920;
int _height = 1080;
long unsigned int _jpegSize = 0;
unsigned char *_compressedImage = NULL;
unsigned char *buffer = new unsigned char [_width * _height * COLOR_COMPONENTS];
tjhandle _jpegCompressor = tjInitCompress();
tjCompress2(_jpegCompressor, buffer, _width, 0, _height, TJPF_RGB, &_compressedImage, &_jpegSize, TJSAMP_444, JPEG_QUALITY, TJFLAG_FASTDCT);
tjDestroy(_jpegCompressor);
// display RGB image in opencv
// Release stream
if (stream != NULL) {
EdsRelease(stream);
stream = NULL;
}
// Release evfImage
if (evfImage != NULL) {
EdsRelease(evfImage);
evfImage = NULL;
}
data = NULL;
// End Live view.
// Get the output device for the live view image
err = EdsGetPropertyData(camera, kEdsPropID_Evf_OutputDevice, 0, sizeof(device), &device);
// PC live view ends if the PC is disconneccted from the live view output device.
if(err == EDS_ERR_OK)
{
device &= ~kEdsEvfOutputDevice_PC;
err = EdsSetPropertyData(camera, kEdsPropID_Evf_OutputDevice, 0, sizeof(device), &device);
}
// Close session with camera
if(err == EDS_ERR_OK)
{
err = EdsCloseSession(camera);
}
// Release camera
if(camera != NULL)
{
EdsRelease(camera);
}
// Terminate SDK
if(isSDKLoaded)
{
EdsTerminateSDK();
}
return true;
}