How can I write my c++ JNI function so that it returns an array of Mat to Java code? I am programming in Android environment, with the help of NDK to use also some functions of OpenCV.
My c++ function is:
JNIEXPORT void JNICALL Java_com_micaela_myapp_MainActivity2_getFrames(JNIEnv* env, jobject object, jstring path)
{
const char *str;
str = env->GetStringUTFChars(path, NULL);
VideoCapture input_video;
if(input_video.open(str)){
cout<<"Video File Opened"<<endl;
}else{
cout<<"Video File Not Found"<<endl;
}
Mat image;
Mat frameBuffer[1000];
int i=0;
while(input_video.read(image)==true){
image.copyTo(frameBuffer[i]);
i++;
}
}
In Java I have:
static{
System.loadLibrary("myapp");
}
public static native void getFrames(String path);
This function now returns void and works properly. However, my purpose is to obtain the array frameBuffer from it, in order to use it in Java. How can I do this?
