Function test_decoder_images_only

dlib/test/ffmpeg.cpp:173–220

      class image_type
    >
    void test_decoder_images_only(
        const std::string& filepath,
        const std::string& codec,
        const int nframes,
        const int height,
        const int width
    )
    {
        decoder dec([&] {
            decoder::args args;
            args.codec_name = codec;
            return args;
        }());

        DLIB_TEST(dec.is_open());
        DLIB_TEST(dec.get_codec_name() == codec);
        DLIB_TEST(dec.is_image_decoder());
        // You can't test for dec.height() or dec.width() yet because no data has been pushed to the decoder.

        image_type      img;
        int             counter{0};

        ifstream fin{filepath, std::ios::binary};
        std::vector<char> buf(1024);

        const auto callback = [&](image_type& img) mutable
        {
            DLIB_TEST(img.nr()      == height);
            DLIB_TEST(img.nc()      == width);
            DLIB_TEST(dec.height()  == height);
            DLIB_TEST(dec.width()   == width);
            ++counter;
            
            if (counter % 10 == 0)
                print_spinner();
        };

        while (fin)
        {
            fin.read(buf.data(), buf.size());
            size_t ret = fin.gcount();
            DLIB_TEST(dec.push((const uint8_t*)buf.data(), ret, wrap(callback)));
        }

        dec.flush(wrap(callback));
        DLIB_TEST(counter == nframes);
        DLIB_TEST(!dec.is_open());
    }

    template <
      class image_type