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OpenCV-Erlang/Elixir binding.

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evision c_src modules evision_videocapture.h
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c_src/modules/evision_videocapture.h 

#ifdef HAVE_OPENCV_VIDEO



// @evision enable_with: video



#ifndef EVISION_VIDEOCAPTURE_H

#define EVISION_VIDEOCAPTURE_H



// @evision c: videoCapture_waitAny,evision_cv_videoCapture_waitAny,1

// @evision nif: def videoCapture_waitAny(_opts \\ []), do: :erlang.nif_error(:undefined)

static ERL_NIF_TERM evision_cv_videoCapture_waitAny(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[])

{

    using namespace cv;

    ERL_NIF_TERM error_term = 0;

    std::map<std::string, ERL_NIF_TERM> erl_terms;

    int nif_opts_index = 0; // <- autogenerated value 

    if (nif_opts_index < argc) {

        evision::nif::parse_arg(env, nif_opts_index, argv, erl_terms);

    }

    std::vector<cv::Ptr<cv::VideoCapture>> ptr_streams;

    std::vector<int> readyIndex;

    int64 timeoutNs=0;

    bool retval;



    if( evision_to_safe(env, evision_get_kw(env, erl_terms, "streams"), ptr_streams, ArgInfo("streams", 0)) && 

        evision_to_safe(env, evision_get_kw(env, erl_terms, "timeoutNs"), timeoutNs, ArgInfo("timeoutNs", 0x8)) )

    {

        int error_flag = false;

        size_t n = ptr_streams.size();

        std::vector<cv::VideoCapture> streams;

        for (size_t i = 0; i < n; i++) {

            auto& ptr = ptr_streams[i];

            streams.emplace_back(*ptr.get());

        }



        ERRWRAP2(retval = cv::VideoCapture::waitAny(streams, readyIndex, timeoutNs), env, error_flag, error_term);

        if (!error_flag) {

            if (retval) {

                // code_ret_1_tuple_except_bool

                return evision_from(env, readyIndex);

            } else {

                return evision::nif::atom(env, "false");

            };

        }

    }



    if (error_term != 0) return error_term;

    else return enif_make_badarg(env);

}



#endif //  EVISION_VIDEOCAPTURE_H



#endif //  HAVE_OPENCV_VIDEO