Running EI C++ Library on Flutter

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#1

Running EI C++ Library on Flutter

I have a simple Flutter FFI example app executing functions in a CPP file.

Then I add the EI stuff to see if Flutter will compile in the EI C++ code:

In the CPP file I add:

#include "edge-impulse-sdk\classifier\ei_run_classifier.h"

In the CMakeList.txt file I add:

include_directories(../../include)
include(../../include/edge-impulse-sdk/cmake/utils.cmake)

The include folder is the EI C++ code that looks like:

# |--include
# |-- edge-impulse-sdk
# |-- model-parameters
# |-- tflite-model
# CMakeLists.txt
# README.txt

The error I get is:

error: no member named 'post_process_boxes' in namespace 'tflite'

Of course tflite_detection_postprocess.cc does indeed define

namespace tflite {
float post_process_boxes[100 * 4 * sizeof(float)];
…}

So the compiler is finding the EI C++ code but can’t compile it.

Is there something I can add to CMakeLists.txt to get this to compile?

#2

Hi @MMarcial,

I’m not familiar with Flutter FFI, so I won’t be able to help much there.

For CMake, I highly recommend checking out this example project: https://github.com/edgeimpulse/example-standalone-inferencing-cmake

From what I can tell, utils.cmake only includes a limited subset of sources/headers that come with the C++ SDK library. You should include the top level directory of the SDK (e.g. my-project-v01). When you unzip the SDK, there should be a CMakeLists.txt in that top level directory that you need to include so that CMake can find everything in the SDK.

Hope that helps!

#3

Thanks for the link. The link provided me with some new ideas.

Now after 10 days with 41 try-fails per-day I say uncle

For anyone interested in solving this issue the Flutter project code for Android Studio is here.

If nothing else the code shows how to call a function in a C++ file from a DART file.