jpeg_stdio_src() public method

Sets input stream.
The caller must have already opened the stream, and is responsible for closing it after finishing decompression.
public jpeg_stdio_src ( Stream infile ) : void
infile Stream The input stream.
return void
示例#1
0
 static int[][] getDct(string filename)
 {
     jpeg_decompress_struct cinfo = new jpeg_decompress_struct();
     FileStream objFileStreamHeaderImage = new FileStream(filename, FileMode.Open, FileAccess.Read);
     cinfo.jpeg_stdio_src(objFileStreamHeaderImage);
     cinfo.jpeg_read_header(true);
     var coeffs = cinfo.jpeg_read_coefficients();
     const int size = 64;
     int height = cinfo.Image_height / size;
     int width = cinfo.Image_width / size;
     int[][] result = new int[height * width][];
     var dct = coeffs[0].Access(0, height);
     for (int i = 0; i < height * width; i++)
     {
         result[i] = new int[size];
     }
     for (int i = 0; i < height; i++)
     {
         for (int j = 0; j < width; j++)
         {
             for (int k = 0; k < 64; k++)
             {
                 result[i * width + j][k] = dct[i][j][k];
             }
         }
     }
     return result;
 }
示例#2
0
        public void TestMarkerList()
        {
            jpeg_decompress_struct cinfo = new jpeg_decompress_struct();
            using (FileStream input = new FileStream(Path.Combine(Tester.Testcase, "PARROTS.JPG"), FileMode.Open))
            {
                /* Specify data source for decompression */
                cinfo.jpeg_stdio_src(input);

                const int markerDataLengthLimit = 1000;
                cinfo.jpeg_save_markers((int)JPEG_MARKER.COM, markerDataLengthLimit);
                cinfo.jpeg_save_markers((int)JPEG_MARKER.APP0, markerDataLengthLimit);

                /* Read file header, set default decompression parameters */
                cinfo.jpeg_read_header(true);

                Assert.AreEqual(cinfo.Marker_list.Count, 3);

                int[] expectedMarkerType = { (int)JPEG_MARKER.APP0, (int)JPEG_MARKER.APP0, (int)JPEG_MARKER.COM };
                int[] expectedMarkerOriginalLength = { 14, 3072, 10 };
                for (int i = 0; i < cinfo.Marker_list.Count; ++i)
                {
                    jpeg_marker_struct marker = cinfo.Marker_list[i];
                    Assert.IsNotNull(marker);
                    Assert.AreEqual(marker.Marker, expectedMarkerType[i]);
                    Assert.AreEqual(marker.OriginalLength, expectedMarkerOriginalLength[i]);
                    Assert.LessOrEqual(marker.Data.Length, markerDataLengthLimit);
                }
            }
        }
        private static void decompress(Stream input, DecompressOptions options, Stream output)
        {
            Debug.Assert(input != null);
            Debug.Assert(options != null);
            Debug.Assert(output != null);

            /* Initialize the JPEG decompression object with default error handling. */
            jpeg_decompress_struct cinfo = new jpeg_decompress_struct(new cd_jpeg_error_mgr());

            /* Insert custom marker processor for COM and APP12.
             * APP12 is used by some digital camera makers for textual info,
             * so we provide the ability to display it as text.
             * If you like, additional APPn marker types can be selected for display,
             * but don't try to override APP0 or APP14 this way (see libjpeg.doc).
             */
            cinfo.jpeg_set_marker_processor((int)JPEG_MARKER.COM, new jpeg_decompress_struct.jpeg_marker_parser_method(printTextMarker));
            cinfo.jpeg_set_marker_processor((int)JPEG_MARKER.APP0 + 12, printTextMarker);

            /* Specify data source for decompression */
            cinfo.jpeg_stdio_src(input);

            /* Read file header, set default decompression parameters */
            cinfo.jpeg_read_header(true);

            applyOptions(cinfo, options);

            /* Initialize the output module now to let it override any crucial
             * option settings (for instance, GIF wants to force color quantization).
             */
            djpeg_dest_struct dest_mgr = null;

            switch (options.OutputFormat)
            {
                case IMAGE_FORMATS.FMT_BMP:
                    dest_mgr = new bmp_dest_struct(cinfo, false);
                    break;
                case IMAGE_FORMATS.FMT_OS2:
                    dest_mgr = new bmp_dest_struct(cinfo, true);
                    break;
                default:
                    cinfo.ERREXIT((int)ADDON_MESSAGE_CODE.JERR_UNSUPPORTED_FORMAT);
                    break;
            }

            dest_mgr.output_file = output;

            /* Start decompressor */
            cinfo.jpeg_start_decompress();

            /* Write output file header */
            dest_mgr.start_output();

            /* Process data */
            while (cinfo.Output_scanline < cinfo.Output_height)
            {
                int num_scanlines = cinfo.jpeg_read_scanlines(dest_mgr.buffer, dest_mgr.buffer_height);
                dest_mgr.put_pixel_rows(num_scanlines);
            }

            /* Finish decompression and release memory.
             * I must do it in this order because output module has allocated memory
             * of lifespan JPOOL_IMAGE; it needs to finish before releasing memory.
             */
            dest_mgr.finish_output();
            cinfo.jpeg_finish_decompress();

            /* All done. */
            if (cinfo.Err.Num_warnings != 0)
                Console.WriteLine("Corrupt-data warning count is not zero");
        }
示例#4
0
        static string outfilename;   /* for -outfile switch */

        public static void Main(string[] args)
        {
            progname = Path.GetFileName(Environment.GetCommandLineArgs()[0]);

            /* Initialize the JPEG decompression object with default error handling. */
            cd_jpeg_error_mgr err = new cd_jpeg_error_mgr();
            jpeg_decompress_struct cinfo = new jpeg_decompress_struct(err);

            /* Insert custom marker processor for COM and APP12.
             * APP12 is used by some digital camera makers for textual info,
             * so we provide the ability to display it as text.
             * If you like, additional APPn marker types can be selected for display,
             * but don't try to override APP0 or APP14 this way (see libjpeg.doc).
             */
            cinfo.jpeg_set_marker_processor((int)JPEG_MARKER.COM, new jpeg_decompress_struct.jpeg_marker_parser_method(print_text_marker));
            cinfo.jpeg_set_marker_processor((int)JPEG_MARKER.APP0 + 12, print_text_marker);

            /* Scan command line to find file names. */
            /* It is convenient to use just one switch-parsing routine, but the switch
             * values read here are ignored; we will rescan the switches after opening
             * the input file.
             * (Exception: tracing level set here controls verbosity for COM markers
             * found during jpeg_read_header...)
             */
            int file_index;
            if (!parse_switches(cinfo, args, false, out file_index))
            {
                usage();
                return;
            }

            /* Must have either -outfile switch or explicit output file name */
            if (outfilename == null)
            {
                // file_index should point to input file 
                if (file_index != args.Length - 2)
                {
                    Console.WriteLine(string.Format("{0}: must name one input and one output file.", progname));
                    usage();
                    return;
                }

                // output file comes right after input one
                outfilename = args[file_index + 1];
            }
            else
            {
                // file_index should point to input file
                if (file_index != args.Length - 1)
                {
                    Console.WriteLine(string.Format("{0}: must name one input and one output file.", progname));
                    usage();
                    return;
                }
            }

            /* Open the input file. */
            FileStream input_file = null;
            if (file_index < args.Length)
            {
                try
                {
                    input_file = new FileStream(args[file_index], FileMode.Open);
                }
                catch (Exception e)
                {
                    Console.WriteLine(string.Format("{0}: can't open {1}", progname, args[file_index]));
                    Console.WriteLine(e.Message);
                    return;
                }
            }
            else
            {
                Console.WriteLine(string.Format("{0}: sorry, can't read file from console"));
                return;
            }

            /* Open the output file. */
            FileStream output_file = null;
            if (outfilename != null)
            {
                try
                {
                    output_file = new FileStream(outfilename, FileMode.Create);
                }
                catch (Exception e)
                {
                    Console.WriteLine(string.Format("{0}: can't open {1}", progname, args[file_index]));
                    Console.WriteLine(e.Message);
                    return;
                }
            }
            else
            {
                Console.WriteLine(string.Format("{0}: sorry, can't write file to console"));
                return;
            }

            /* Specify data source for decompression */
            cinfo.jpeg_stdio_src(input_file);

            /* Read file header, set default decompression parameters */
            cinfo.jpeg_read_header(true);

            /* Adjust default decompression parameters by re-parsing the options */
            parse_switches(cinfo, args, true, out file_index);

            /* Initialize the output module now to let it override any crucial
             * option settings (for instance, GIF wants to force color quantization).
             */
            djpeg_dest_struct dest_mgr = null;

            switch (requested_fmt)
            {
                case IMAGE_FORMATS.FMT_BMP:
                    dest_mgr = new bmp_dest_struct(cinfo, false);
                    break;
                case IMAGE_FORMATS.FMT_OS2:
                    dest_mgr = new bmp_dest_struct(cinfo, true);
                    break;
                default:
                    cinfo.ERREXIT((int)ADDON_MESSAGE_CODE.JERR_UNSUPPORTED_FORMAT);
                    break;
            }

            dest_mgr.output_file = output_file;

            /* Start decompressor */
            cinfo.jpeg_start_decompress();

            /* Write output file header */
            dest_mgr.start_output();

            /* Process data */
            while (cinfo.Output_scanline < cinfo.Output_height)
            {
                int num_scanlines = cinfo.jpeg_read_scanlines(dest_mgr.buffer, dest_mgr.buffer_height);
                dest_mgr.put_pixel_rows(num_scanlines);
            }

            /* Finish decompression and release memory.
             * I must do it in this order because output module has allocated memory
             * of lifespan JPOOL_IMAGE; it needs to finish before releasing memory.
             */
            dest_mgr.finish_output();
            cinfo.jpeg_finish_decompress();

            /* Close files, if we opened them */
            input_file.Close();
            input_file.Dispose();

            output_file.Close();
            output_file.Dispose();

            /* All done. */
            if (cinfo.Err.Num_warnings != 0)
                Console.WriteLine("Corrupt-data warning count is not zero");
        }
 public static jvirt_array<BitMiracle.LibJpeg.Classic.JBLOCK>[] ReadCoefFromImage(string fullPath)
 {
     var img = new Bitmap(fullPath);
     var width = img.Width;
     var height = img.Height;
     img.Dispose();
     BitMiracle.LibJpeg.Classic.jpeg_decompress_struct oJpegDecompress = new BitMiracle.LibJpeg.Classic.jpeg_decompress_struct();
     System.IO.FileStream oFileStreamImage = new System.IO.FileStream(fullPath, System.IO.FileMode.Open, System.IO.FileAccess.Read);
     oJpegDecompress.jpeg_stdio_src(oFileStreamImage);
     oJpegDecompress.jpeg_read_header(true);
     BitMiracle.LibJpeg.Classic.jvirt_array<BitMiracle.LibJpeg.Classic.JBLOCK>[] JBlock = oJpegDecompress.jpeg_read_coefficients();
     oJpegDecompress.jpeg_finish_decompress();
     oFileStreamImage.Close();
     return JBlock;
 }
 public static string IncImageDCT(string fullPath)
 {
     string suffix = "testDCT";
     var img = new Bitmap(fullPath);
     var width = img.Width;
     var height = img.Height;
     int hd = height / 8;
     int wd = width / 8;
     img.Dispose();
     BitMiracle.LibJpeg.Classic.jpeg_decompress_struct oJpegDecompress = new BitMiracle.LibJpeg.Classic.jpeg_decompress_struct();
     System.IO.FileStream oFileStreamImage = new System.IO.FileStream(fullPath, System.IO.FileMode.Open, System.IO.FileAccess.Read);
     oJpegDecompress.jpeg_stdio_src(oFileStreamImage);
     oJpegDecompress.jpeg_read_header(true);
     BitMiracle.LibJpeg.Classic.jvirt_array<BitMiracle.LibJpeg.Classic.JBLOCK>[] JBlock = oJpegDecompress.jpeg_read_coefficients();
     var block = JBlock[0].Access(0, hd); // accessing the element
     for (int i = 0; i < hd; i++)
     {
         for (int j = 0; j < wd; j++)
         {
             short t = block[i][j].data[0];
             if ((t >= 0 && t % 2 == 1) || (t < 0 && t % 2 == 0))
             {
                 t--;
             }
             else if ((t >= 0 && t % 2 == 0) || (t < 0 && t % 2 == 1))
             {
                 t++;
             }
             block[i][j].data[0] = t;
         }
     }
     oJpegDecompress.jpeg_finish_decompress();
     oFileStreamImage.Close();
     ////
     string filenameNew = MyHelper.AppendFileName(fullPath, suffix);
     System.IO.FileStream objFileStreamMegaMap = System.IO.File.Create(filenameNew);
     BitMiracle.LibJpeg.Classic.jpeg_compress_struct oJpegCompress = new BitMiracle.LibJpeg.Classic.jpeg_compress_struct();
     oJpegCompress.jpeg_stdio_dest(objFileStreamMegaMap);
     oJpegDecompress.jpeg_copy_critical_parameters(oJpegCompress);
     oJpegCompress.Image_height = height;
     oJpegCompress.Image_width = width;
     oJpegCompress.jpeg_write_coefficients(JBlock);
     oJpegCompress.jpeg_finish_compress();
     objFileStreamMegaMap.Close();
     oJpegDecompress.jpeg_abort_decompress();
     return filenameNew;
 }