SAMV71 Xplained Ultra Software Package 1.4

jpegtran.c

00001 /*
00002  * jpegtran.c
00003  *
00004  * Copyright (C) 1995-2010, Thomas G. Lane, Guido Vollbeding.
00005  * This file is part of the Independent JPEG Group's software.
00006  * For conditions of distribution and use, see the accompanying README file.
00007  *
00008  * This file contains a command-line user interface for JPEG transcoding.
00009  * It is very similar to cjpeg.c, and partly to djpeg.c, but provides
00010  * lossless transcoding between different JPEG file formats.  It also
00011  * provides some lossless and sort-of-lossless transformations of JPEG data.
00012  */
00013 
00014 #include "cdjpeg.h"     /* Common decls for cjpeg/djpeg applications */
00015 #include "transupp.h"       /* Support routines for jpegtran */
00016 #include "jversion.h"       /* for version message */
00017 
00018 #ifdef USE_CCOMMAND     /* command-line reader for Macintosh */
00019 #ifdef __MWERKS__
00020 #include <SIOUX.h>              /* Metrowerks needs this */
00021 #include <console.h>        /* ... and this */
00022 #endif
00023 #ifdef THINK_C
00024 #include <console.h>        /* Think declares it here */
00025 #endif
00026 #endif
00027 
00028 
00029 /*
00030  * Argument-parsing code.
00031  * The switch parser is designed to be useful with DOS-style command line
00032  * syntax, ie, intermixed switches and file names, where only the switches
00033  * to the left of a given file name affect processing of that file.
00034  * The main program in this file doesn't actually use this capability...
00035  */
00036 
00037 
00038 static const char * progname;   /* program name for error messages */
00039 static char * outfilename;  /* for -outfile switch */
00040 static char * scaleoption;  /* -scale switch */
00041 static JCOPY_OPTION copyoption; /* -copy switch */
00042 static jpeg_transform_info transformoption; /* image transformation options */
00043 
00044 
00045 LOCAL(void)
00046 usage (void)
00047 /* complain about bad command line */
00048 {
00049   fprintf(stderr, "usage: %s [switches] ", progname);
00050 #ifdef TWO_FILE_COMMANDLINE
00051   fprintf(stderr, "inputfile outputfile\n");
00052 #else
00053   fprintf(stderr, "[inputfile]\n");
00054 #endif
00055 
00056   fprintf(stderr, "Switches (names may be abbreviated):\n");
00057   fprintf(stderr, "  -copy none     Copy no extra markers from source file\n");
00058   fprintf(stderr, "  -copy comments Copy only comment markers (default)\n");
00059   fprintf(stderr, "  -copy all      Copy all extra markers\n");
00060 #ifdef ENTROPY_OPT_SUPPORTED
00061   fprintf(stderr, "  -optimize      Optimize Huffman table (smaller file, but slow compression)\n");
00062 #endif
00063 #ifdef C_PROGRESSIVE_SUPPORTED
00064   fprintf(stderr, "  -progressive   Create progressive JPEG file\n");
00065 #endif
00066   fprintf(stderr, "Switches for modifying the image:\n");
00067 #if TRANSFORMS_SUPPORTED
00068   fprintf(stderr, "  -crop WxH+X+Y  Crop to a rectangular subarea\n");
00069   fprintf(stderr, "  -grayscale     Reduce to grayscale (omit color data)\n");
00070   fprintf(stderr, "  -flip [horizontal|vertical]  Mirror image (left-right or top-bottom)\n");
00071   fprintf(stderr, "  -perfect       Fail if there is non-transformable edge blocks\n");
00072   fprintf(stderr, "  -rotate [90|180|270]         Rotate image (degrees clockwise)\n");
00073 #endif
00074   fprintf(stderr, "  -scale M/N     Scale output image by fraction M/N, eg, 1/8\n");
00075 #if TRANSFORMS_SUPPORTED
00076   fprintf(stderr, "  -transpose     Transpose image\n");
00077   fprintf(stderr, "  -transverse    Transverse transpose image\n");
00078   fprintf(stderr, "  -trim          Drop non-transformable edge blocks\n");
00079 #endif
00080   fprintf(stderr, "Switches for advanced users:\n");
00081   fprintf(stderr, "  -restart N     Set restart interval in rows, or in blocks with B\n");
00082   fprintf(stderr, "  -maxmemory N   Maximum memory to use (in kbytes)\n");
00083   fprintf(stderr, "  -outfile name  Specify name for output file\n");
00084   fprintf(stderr, "  -verbose  or  -debug   Emit debug output\n");
00085   fprintf(stderr, "Switches for wizards:\n");
00086 #ifdef C_ARITH_CODING_SUPPORTED
00087   fprintf(stderr, "  -arithmetic    Use arithmetic coding\n");
00088 #endif
00089 #ifdef C_MULTISCAN_FILES_SUPPORTED
00090   fprintf(stderr, "  -scans file    Create multi-scan JPEG per script file\n");
00091 #endif
00092   exit(EXIT_FAILURE);
00093 }
00094 
00095 
00096 LOCAL(void)
00097 select_transform (JXFORM_CODE transform)
00098 /* Silly little routine to detect multiple transform options,
00099  * which we can't handle.
00100  */
00101 {
00102 #if TRANSFORMS_SUPPORTED
00103   if (transformoption.transform == JXFORM_NONE ||
00104       transformoption.transform == transform) {
00105     transformoption.transform = transform;
00106   } else {
00107     fprintf(stderr, "%s: can only do one image transformation at a time\n",
00108         progname);
00109     usage();
00110   }
00111 #else
00112   fprintf(stderr, "%s: sorry, image transformation was not compiled\n",
00113       progname);
00114   exit(EXIT_FAILURE);
00115 #endif
00116 }
00117 
00118 
00119 LOCAL(int)
00120 parse_switches (j_compress_ptr cinfo, int argc, char **argv,
00121         int last_file_arg_seen, boolean for_real)
00122 /* Parse optional switches.
00123  * Returns argv[] index of first file-name argument (== argc if none).
00124  * Any file names with indexes <= last_file_arg_seen are ignored;
00125  * they have presumably been processed in a previous iteration.
00126  * (Pass 0 for last_file_arg_seen on the first or only iteration.)
00127  * for_real is FALSE on the first (dummy) pass; we may skip any expensive
00128  * processing.
00129  */
00130 {
00131   int argn;
00132   char * arg;
00133   boolean simple_progressive;
00134   char * scansarg = NULL;   /* saves -scans parm if any */
00135 
00136   /* Set up default JPEG parameters. */
00137   simple_progressive = FALSE;
00138   outfilename = NULL;
00139   scaleoption = NULL;
00140   copyoption = JCOPYOPT_DEFAULT;
00141   transformoption.transform = JXFORM_NONE;
00142   transformoption.perfect = FALSE;
00143   transformoption.trim = FALSE;
00144   transformoption.force_grayscale = FALSE;
00145   transformoption.crop = FALSE;
00146   cinfo->err->trace_level = 0;
00147 
00148   /* Scan command line options, adjust parameters */
00149 
00150   for (argn = 1; argn < argc; argn++) {
00151     arg = argv[argn];
00152     if (*arg != '-') {
00153       /* Not a switch, must be a file name argument */
00154       if (argn <= last_file_arg_seen) {
00155     outfilename = NULL; /* -outfile applies to just one input file */
00156     continue;       /* ignore this name if previously processed */
00157       }
00158       break;            /* else done parsing switches */
00159     }
00160     arg++;          /* advance past switch marker character */
00161 
00162     if (keymatch(arg, "arithmetic", 1)) {
00163       /* Use arithmetic coding. */
00164 #ifdef C_ARITH_CODING_SUPPORTED
00165       cinfo->arith_code = TRUE;
00166 #else
00167       fprintf(stderr, "%s: sorry, arithmetic coding not supported\n",
00168           progname);
00169       exit(EXIT_FAILURE);
00170 #endif
00171 
00172     } else if (keymatch(arg, "copy", 2)) {
00173       /* Select which extra markers to copy. */
00174       if (++argn >= argc)   /* advance to next argument */
00175     usage();
00176       if (keymatch(argv[argn], "none", 1)) {
00177     copyoption = JCOPYOPT_NONE;
00178       } else if (keymatch(argv[argn], "comments", 1)) {
00179     copyoption = JCOPYOPT_COMMENTS;
00180       } else if (keymatch(argv[argn], "all", 1)) {
00181     copyoption = JCOPYOPT_ALL;
00182       } else
00183     usage();
00184 
00185     } else if (keymatch(arg, "crop", 2)) {
00186       /* Perform lossless cropping. */
00187 #if TRANSFORMS_SUPPORTED
00188       if (++argn >= argc)   /* advance to next argument */
00189     usage();
00190       if (! jtransform_parse_crop_spec(&transformoption, argv[argn])) {
00191     fprintf(stderr, "%s: bogus -crop argument '%s'\n",
00192         progname, argv[argn]);
00193     exit(EXIT_FAILURE);
00194       }
00195 #else
00196       select_transform(JXFORM_NONE);    /* force an error */
00197 #endif
00198 
00199     } else if (keymatch(arg, "debug", 1) || keymatch(arg, "verbose", 1)) {
00200       /* Enable debug printouts. */
00201       /* On first -d, print version identification */
00202       static boolean printed_version = FALSE;
00203 
00204       if (! printed_version) {
00205     fprintf(stderr, "Independent JPEG Group's JPEGTRAN, version %s\n%s\n",
00206         JVERSION, JCOPYRIGHT);
00207     printed_version = TRUE;
00208       }
00209       cinfo->err->trace_level++;
00210 
00211     } else if (keymatch(arg, "flip", 1)) {
00212       /* Mirror left-right or top-bottom. */
00213       if (++argn >= argc)   /* advance to next argument */
00214     usage();
00215       if (keymatch(argv[argn], "horizontal", 1))
00216     select_transform(JXFORM_FLIP_H);
00217       else if (keymatch(argv[argn], "vertical", 1))
00218     select_transform(JXFORM_FLIP_V);
00219       else
00220     usage();
00221 
00222     } else if (keymatch(arg, "grayscale", 1) || keymatch(arg, "greyscale",1)) {
00223       /* Force to grayscale. */
00224 #if TRANSFORMS_SUPPORTED
00225       transformoption.force_grayscale = TRUE;
00226 #else
00227       select_transform(JXFORM_NONE);    /* force an error */
00228 #endif
00229 
00230     } else if (keymatch(arg, "maxmemory", 3)) {
00231       /* Maximum memory in Kb (or Mb with 'm'). */
00232       long lval;
00233       char ch = 'x';
00234 
00235       if (++argn >= argc)   /* advance to next argument */
00236     usage();
00237       if (sscanf(argv[argn], "%ld%c", &lval, &ch) < 1)
00238     usage();
00239       if (ch == 'm' || ch == 'M')
00240     lval *= 1000L;
00241       cinfo->mem->max_memory_to_use = lval * 1000L;
00242 
00243     } else if (keymatch(arg, "optimize", 1) || keymatch(arg, "optimise", 1)) {
00244       /* Enable entropy parm optimization. */
00245 #ifdef ENTROPY_OPT_SUPPORTED
00246       cinfo->optimize_coding = TRUE;
00247 #else
00248       fprintf(stderr, "%s: sorry, entropy optimization was not compiled\n",
00249           progname);
00250       exit(EXIT_FAILURE);
00251 #endif
00252 
00253     } else if (keymatch(arg, "outfile", 4)) {
00254       /* Set output file name. */
00255       if (++argn >= argc)   /* advance to next argument */
00256     usage();
00257       outfilename = argv[argn]; /* save it away for later use */
00258 
00259     } else if (keymatch(arg, "perfect", 2)) {
00260       /* Fail if there is any partial edge MCUs that the transform can't
00261        * handle. */
00262       transformoption.perfect = TRUE;
00263 
00264     } else if (keymatch(arg, "progressive", 2)) {
00265       /* Select simple progressive mode. */
00266 #ifdef C_PROGRESSIVE_SUPPORTED
00267       simple_progressive = TRUE;
00268       /* We must postpone execution until num_components is known. */
00269 #else
00270       fprintf(stderr, "%s: sorry, progressive output was not compiled\n",
00271           progname);
00272       exit(EXIT_FAILURE);
00273 #endif
00274 
00275     } else if (keymatch(arg, "restart", 1)) {
00276       /* Restart interval in MCU rows (or in MCUs with 'b'). */
00277       long lval;
00278       char ch = 'x';
00279 
00280       if (++argn >= argc)   /* advance to next argument */
00281     usage();
00282       if (sscanf(argv[argn], "%ld%c", &lval, &ch) < 1)
00283     usage();
00284       if (lval < 0 || lval > 65535L)
00285     usage();
00286       if (ch == 'b' || ch == 'B') {
00287     cinfo->restart_interval = (unsigned int) lval;
00288     cinfo->restart_in_rows = 0; /* else prior '-restart n' overrides me */
00289       } else {
00290     cinfo->restart_in_rows = (int) lval;
00291     /* restart_interval will be computed during startup */
00292       }
00293 
00294     } else if (keymatch(arg, "rotate", 2)) {
00295       /* Rotate 90, 180, or 270 degrees (measured clockwise). */
00296       if (++argn >= argc)   /* advance to next argument */
00297     usage();
00298       if (keymatch(argv[argn], "90", 2))
00299     select_transform(JXFORM_ROT_90);
00300       else if (keymatch(argv[argn], "180", 3))
00301     select_transform(JXFORM_ROT_180);
00302       else if (keymatch(argv[argn], "270", 3))
00303     select_transform(JXFORM_ROT_270);
00304       else
00305     usage();
00306 
00307     } else if (keymatch(arg, "scale", 4)) {
00308       /* Scale the output image by a fraction M/N. */
00309       if (++argn >= argc)   /* advance to next argument */
00310     usage();
00311       scaleoption = argv[argn];
00312       /* We must postpone processing until decompression startup. */
00313 
00314     } else if (keymatch(arg, "scans", 1)) {
00315       /* Set scan script. */
00316 #ifdef C_MULTISCAN_FILES_SUPPORTED
00317       if (++argn >= argc)   /* advance to next argument */
00318     usage();
00319       scansarg = argv[argn];
00320       /* We must postpone reading the file in case -progressive appears. */
00321 #else
00322       fprintf(stderr, "%s: sorry, multi-scan output was not compiled\n",
00323           progname);
00324       exit(EXIT_FAILURE);
00325 #endif
00326 
00327     } else if (keymatch(arg, "transpose", 1)) {
00328       /* Transpose (across UL-to-LR axis). */
00329       select_transform(JXFORM_TRANSPOSE);
00330 
00331     } else if (keymatch(arg, "transverse", 6)) {
00332       /* Transverse transpose (across UR-to-LL axis). */
00333       select_transform(JXFORM_TRANSVERSE);
00334 
00335     } else if (keymatch(arg, "trim", 3)) {
00336       /* Trim off any partial edge MCUs that the transform can't handle. */
00337       transformoption.trim = TRUE;
00338 
00339     } else {
00340       usage();          /* bogus switch */
00341     }
00342   }
00343 
00344   /* Post-switch-scanning cleanup */
00345 
00346   if (for_real) {
00347 
00348 #ifdef C_PROGRESSIVE_SUPPORTED
00349     if (simple_progressive) /* process -progressive; -scans can override */
00350       jpeg_simple_progression(cinfo);
00351 #endif
00352 
00353 #ifdef C_MULTISCAN_FILES_SUPPORTED
00354     if (scansarg != NULL)   /* process -scans if it was present */
00355       if (! read_scan_script(cinfo, scansarg))
00356     usage();
00357 #endif
00358   }
00359 
00360   return argn;          /* return index of next arg (file name) */
00361 }
00362 
00363 
00364 /*
00365  * The main program.
00366  */
00367 
00368 int
00369 main (int argc, char **argv)
00370 {
00371   struct jpeg_decompress_struct srcinfo;
00372   struct jpeg_compress_struct dstinfo;
00373   struct jpeg_error_mgr jsrcerr, jdsterr;
00374 #ifdef PROGRESS_REPORT
00375   struct cdjpeg_progress_mgr progress;
00376 #endif
00377   jvirt_barray_ptr * src_coef_arrays;
00378   jvirt_barray_ptr * dst_coef_arrays;
00379   int file_index;
00380   /* We assume all-in-memory processing and can therefore use only a
00381    * single file pointer for sequential input and output operation. 
00382    */
00383   FILE * fp;
00384 
00385   /* On Mac, fetch a command line. */
00386 #ifdef USE_CCOMMAND
00387   argc = ccommand(&argv);
00388 #endif
00389 
00390   progname = argv[0];
00391   if (progname == NULL || progname[0] == 0)
00392     progname = "jpegtran";  /* in case C library doesn't provide it */
00393 
00394   /* Initialize the JPEG decompression object with default error handling. */
00395   srcinfo.err = jpeg_std_error(&jsrcerr);
00396   jpeg_create_decompress(&srcinfo);
00397   /* Initialize the JPEG compression object with default error handling. */
00398   dstinfo.err = jpeg_std_error(&jdsterr);
00399   jpeg_create_compress(&dstinfo);
00400 
00401   /* Now safe to enable signal catcher.
00402    * Note: we assume only the decompression object will have virtual arrays.
00403    */
00404 #ifdef NEED_SIGNAL_CATCHER
00405   enable_signal_catcher((j_common_ptr) &srcinfo);
00406 #endif
00407 
00408   /* Scan command line to find file names.
00409    * It is convenient to use just one switch-parsing routine, but the switch
00410    * values read here are mostly ignored; we will rescan the switches after
00411    * opening the input file.  Also note that most of the switches affect the
00412    * destination JPEG object, so we parse into that and then copy over what
00413    * needs to affects the source too.
00414    */
00415 
00416   file_index = parse_switches(&dstinfo, argc, argv, 0, FALSE);
00417   jsrcerr.trace_level = jdsterr.trace_level;
00418   srcinfo.mem->max_memory_to_use = dstinfo.mem->max_memory_to_use;
00419 
00420 #ifdef TWO_FILE_COMMANDLINE
00421   /* Must have either -outfile switch or explicit output file name */
00422   if (outfilename == NULL) {
00423     if (file_index != argc-2) {
00424       fprintf(stderr, "%s: must name one input and one output file\n",
00425           progname);
00426       usage();
00427     }
00428     outfilename = argv[file_index+1];
00429   } else {
00430     if (file_index != argc-1) {
00431       fprintf(stderr, "%s: must name one input and one output file\n",
00432           progname);
00433       usage();
00434     }
00435   }
00436 #else
00437   /* Unix style: expect zero or one file name */
00438   if (file_index < argc-1) {
00439     fprintf(stderr, "%s: only one input file\n", progname);
00440     usage();
00441   }
00442 #endif /* TWO_FILE_COMMANDLINE */
00443 
00444   /* Open the input file. */
00445   if (file_index < argc) {
00446     if ((fp = fopen(argv[file_index], READ_BINARY)) == NULL) {
00447       fprintf(stderr, "%s: can't open %s for reading\n", progname, argv[file_index]);
00448       exit(EXIT_FAILURE);
00449     }
00450   } else {
00451     /* default input file is stdin */
00452     fp = read_stdin();
00453   }
00454 
00455 #ifdef PROGRESS_REPORT
00456   start_progress_monitor((j_common_ptr) &dstinfo, &progress);
00457 #endif
00458 
00459   /* Specify data source for decompression */
00460   jpeg_stdio_src(&srcinfo, fp);
00461 
00462   /* Enable saving of extra markers that we want to copy */
00463   jcopy_markers_setup(&srcinfo, copyoption);
00464 
00465   /* Read file header */
00466   (void) jpeg_read_header(&srcinfo, TRUE);
00467 
00468   /* Adjust default decompression parameters */
00469   if (scaleoption != NULL)
00470     if (sscanf(scaleoption, "%d/%d",
00471     &srcinfo.scale_num, &srcinfo.scale_denom) < 1)
00472       usage();
00473 
00474   /* Any space needed by a transform option must be requested before
00475    * jpeg_read_coefficients so that memory allocation will be done right.
00476    */
00477 #if TRANSFORMS_SUPPORTED
00478   /* Fail right away if -perfect is given and transformation is not perfect.
00479    */
00480   if (!jtransform_request_workspace(&srcinfo, &transformoption)) {
00481     fprintf(stderr, "%s: transformation is not perfect\n", progname);
00482     exit(EXIT_FAILURE);
00483   }
00484 #endif
00485 
00486   /* Read source file as DCT coefficients */
00487   src_coef_arrays = jpeg_read_coefficients(&srcinfo);
00488 
00489   /* Initialize destination compression parameters from source values */
00490   jpeg_copy_critical_parameters(&srcinfo, &dstinfo);
00491 
00492   /* Adjust destination parameters if required by transform options;
00493    * also find out which set of coefficient arrays will hold the output.
00494    */
00495 #if TRANSFORMS_SUPPORTED
00496   dst_coef_arrays = jtransform_adjust_parameters(&srcinfo, &dstinfo,
00497                          src_coef_arrays,
00498                          &transformoption);
00499 #else
00500   dst_coef_arrays = src_coef_arrays;
00501 #endif
00502 
00503   /* Close input file, if we opened it.
00504    * Note: we assume that jpeg_read_coefficients consumed all input
00505    * until JPEG_REACHED_EOI, and that jpeg_finish_decompress will
00506    * only consume more while (! cinfo->inputctl->eoi_reached).
00507    * We cannot call jpeg_finish_decompress here since we still need the
00508    * virtual arrays allocated from the source object for processing.
00509    */
00510   if (fp != stdin)
00511     fclose(fp);
00512 
00513   /* Open the output file. */
00514   if (outfilename != NULL) {
00515     if ((fp = fopen(outfilename, WRITE_BINARY)) == NULL) {
00516       fprintf(stderr, "%s: can't open %s for writing\n", progname, outfilename);
00517       exit(EXIT_FAILURE);
00518     }
00519   } else {
00520     /* default output file is stdout */
00521     fp = write_stdout();
00522   }
00523 
00524   /* Adjust default compression parameters by re-parsing the options */
00525   file_index = parse_switches(&dstinfo, argc, argv, 0, TRUE);
00526 
00527   /* Specify data destination for compression */
00528   jpeg_stdio_dest(&dstinfo, fp);
00529 
00530   /* Start compressor (note no image data is actually written here) */
00531   jpeg_write_coefficients(&dstinfo, dst_coef_arrays);
00532 
00533   /* Copy to the output file any extra markers that we want to preserve */
00534   jcopy_markers_execute(&srcinfo, &dstinfo, copyoption);
00535 
00536   /* Execute image transformation, if any */
00537 #if TRANSFORMS_SUPPORTED
00538   jtransform_execute_transformation(&srcinfo, &dstinfo,
00539                     src_coef_arrays,
00540                     &transformoption);
00541 #endif
00542 
00543   /* Finish compression and release memory */
00544   jpeg_finish_compress(&dstinfo);
00545   jpeg_destroy_compress(&dstinfo);
00546   (void) jpeg_finish_decompress(&srcinfo);
00547   jpeg_destroy_decompress(&srcinfo);
00548 
00549   /* Close output file, if we opened it */
00550   if (fp != stdout)
00551     fclose(fp);
00552 
00553 #ifdef PROGRESS_REPORT
00554   end_progress_monitor((j_common_ptr) &dstinfo);
00555 #endif
00556 
00557   /* All done. */
00558   exit(jsrcerr.num_warnings + jdsterr.num_warnings ?EXIT_WARNING:EXIT_SUCCESS);
00559   return 0;         /* suppress no-return-value warnings */
00560 }
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