How to define a MODULE_CALLBACK?

Accelerated Computing Intelligent Video Analytics DeepStream SDK
1

Hi,

I’d like to know if there is an example to define a MODULE_CALLBACK for an IModule task? I want to use the setCallback to get the output in my own function. Can anyone help? Thanks.

2

Hi,

Suppose you are using DeepStream1.5

The description of Callback function can be found in section 4.2.3.
The example code can found in ‘samples/nvDecInfer_classification/nvDecInfer.cpp’

Thanks.

3

Hi AastaLLL,

I know there are some definitions like this:

    void setCallback(void *pUserData, MODULE_CALLBACK callback) override {
	pUserData_ = pUserData;
	callback_ = callback;
}

std::pair<void *, MODULE_CALLBACK> getCallback() const override {
	return std::pair<void*, MODULE_CALLBACK>(pUserData_, callback_);
}
    ......
    MODULE_CALLBACK callback_{ nullptr };

But there is no description of how to define the MODULE_CALLBACK object I need to pass into the setCallback function.

I try to define something like this:

MODULE_CALLBACK testfun(){
std::cout<<“test”<<std::endl;
}

and pass this testfun to setCallback as shown here:

IModule *pConvertor = pDeviceWorker->addColorSpaceConvertorTask(BGR_PLANAR);
pConvertor->setCallback(nullptr,testfun);

But I got the error:

nvCuvidPerf.cpp: In function ‘int main(int, char**)’:
nvCuvidPerf.cpp:100:48: error: invalid conversion from ‘void (* ()())(void, std::vector<IStreamTensor*>&)’ to ‘MODULE_CALLBACK {aka void ()(void, std::vector<IStreamTensor*>&)}’ [-fpermissive]
pConvertor->setCallback(nullptr,testfun);
^
In file included from …/…/include/deepStream.h:41:0,
from nvCuvidPerf.cpp:37:
…/…/include/module.h:456:15: note: initializing argument 2 of ‘virtual void IModule::setCallback(void*, MODULE_CALLBACK)’
virtual void setCallback(void *pUserData, MODULE_CALLBACK callback) = 0;
^
Makefile.sample_decPerf:66: recipe for target ‘…/bin/chobj/nvCuvidPerf.o’ failed
make: *** […/bin/chobj/nvCuvidPerf.o] Error 1

Please help!

4

Hi,

We are checking if there is any callback example we can share.
Will update information with you later.

Thanks.