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560 lines
18 KiB
560 lines
18 KiB
/* |
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* jpegtran.c |
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* |
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* Copyright (C) 1995-2010, Thomas G. Lane, Guido Vollbeding. |
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* This file is part of the Independent JPEG Group's software. |
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* For conditions of distribution and use, see the accompanying README file. |
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* |
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* This file contains a command-line user interface for JPEG transcoding. |
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* It is very similar to cjpeg.c, and partly to djpeg.c, but provides |
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* lossless transcoding between different JPEG file formats. It also |
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* provides some lossless and sort-of-lossless transformations of JPEG data. |
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*/ |
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#include "cdjpeg.h" /* Common decls for cjpeg/djpeg applications */ |
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#include "transupp.h" /* Support routines for jpegtran */ |
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#include "jversion.h" /* for version message */ |
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#ifdef USE_CCOMMAND /* command-line reader for Macintosh */ |
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#ifdef __MWERKS__ |
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#include <SIOUX.h> /* Metrowerks needs this */ |
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#include <console.h> /* ... and this */ |
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#endif |
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#ifdef THINK_C |
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#include <console.h> /* Think declares it here */ |
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#endif |
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#endif |
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/* |
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* Argument-parsing code. |
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* The switch parser is designed to be useful with DOS-style command line |
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* syntax, ie, intermixed switches and file names, where only the switches |
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* to the left of a given file name affect processing of that file. |
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* The main program in this file doesn't actually use this capability... |
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*/ |
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static const char * progname; /* program name for error messages */ |
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static char * outfilename; /* for -outfile switch */ |
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static char * scaleoption; /* -scale switch */ |
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static JCOPY_OPTION copyoption; /* -copy switch */ |
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static jpeg_transform_info transformoption; /* image transformation options */ |
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LOCAL(void) |
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usage (void) |
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/* complain about bad command line */ |
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{ |
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fprintf(stderr, "usage: %s [switches] ", progname); |
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#ifdef TWO_FILE_COMMANDLINE |
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fprintf(stderr, "inputfile outputfile\n"); |
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#else |
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fprintf(stderr, "[inputfile]\n"); |
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#endif |
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fprintf(stderr, "Switches (names may be abbreviated):\n"); |
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fprintf(stderr, " -copy none Copy no extra markers from source file\n"); |
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fprintf(stderr, " -copy comments Copy only comment markers (default)\n"); |
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fprintf(stderr, " -copy all Copy all extra markers\n"); |
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#ifdef ENTROPY_OPT_SUPPORTED |
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fprintf(stderr, " -optimize Optimize Huffman table (smaller file, but slow compression)\n"); |
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#endif |
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#ifdef C_PROGRESSIVE_SUPPORTED |
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fprintf(stderr, " -progressive Create progressive JPEG file\n"); |
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#endif |
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fprintf(stderr, "Switches for modifying the image:\n"); |
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#if TRANSFORMS_SUPPORTED |
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fprintf(stderr, " -crop WxH+X+Y Crop to a rectangular subarea\n"); |
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fprintf(stderr, " -grayscale Reduce to grayscale (omit color data)\n"); |
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fprintf(stderr, " -flip [horizontal|vertical] Mirror image (left-right or top-bottom)\n"); |
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fprintf(stderr, " -perfect Fail if there is non-transformable edge blocks\n"); |
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fprintf(stderr, " -rotate [90|180|270] Rotate image (degrees clockwise)\n"); |
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#endif |
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fprintf(stderr, " -scale M/N Scale output image by fraction M/N, eg, 1/8\n"); |
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#if TRANSFORMS_SUPPORTED |
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fprintf(stderr, " -transpose Transpose image\n"); |
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fprintf(stderr, " -transverse Transverse transpose image\n"); |
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fprintf(stderr, " -trim Drop non-transformable edge blocks\n"); |
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#endif |
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fprintf(stderr, "Switches for advanced users:\n"); |
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fprintf(stderr, " -restart N Set restart interval in rows, or in blocks with B\n"); |
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fprintf(stderr, " -maxmemory N Maximum memory to use (in kbytes)\n"); |
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fprintf(stderr, " -outfile name Specify name for output file\n"); |
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fprintf(stderr, " -verbose or -debug Emit debug output\n"); |
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fprintf(stderr, "Switches for wizards:\n"); |
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#ifdef C_ARITH_CODING_SUPPORTED |
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fprintf(stderr, " -arithmetic Use arithmetic coding\n"); |
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#endif |
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#ifdef C_MULTISCAN_FILES_SUPPORTED |
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fprintf(stderr, " -scans file Create multi-scan JPEG per script file\n"); |
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#endif |
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exit(EXIT_FAILURE); |
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} |
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LOCAL(void) |
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select_transform (JXFORM_CODE transform) |
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/* Silly little routine to detect multiple transform options, |
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* which we can't handle. |
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*/ |
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{ |
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#if TRANSFORMS_SUPPORTED |
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if (transformoption.transform == JXFORM_NONE || |
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transformoption.transform == transform) { |
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transformoption.transform = transform; |
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} else { |
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fprintf(stderr, "%s: can only do one image transformation at a time\n", |
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progname); |
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usage(); |
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} |
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#else |
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fprintf(stderr, "%s: sorry, image transformation was not compiled\n", |
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progname); |
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exit(EXIT_FAILURE); |
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#endif |
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} |
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LOCAL(int) |
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parse_switches (j_compress_ptr cinfo, int argc, char **argv, |
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int last_file_arg_seen, boolean for_real) |
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/* Parse optional switches. |
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* Returns argv[] index of first file-name argument (== argc if none). |
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* Any file names with indexes <= last_file_arg_seen are ignored; |
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* they have presumably been processed in a previous iteration. |
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* (Pass 0 for last_file_arg_seen on the first or only iteration.) |
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* for_real is FALSE on the first (dummy) pass; we may skip any expensive |
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* processing. |
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*/ |
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{ |
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int argn; |
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char * arg; |
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boolean simple_progressive; |
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char * scansarg = NULL; /* saves -scans parm if any */ |
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/* Set up default JPEG parameters. */ |
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simple_progressive = FALSE; |
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outfilename = NULL; |
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scaleoption = NULL; |
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copyoption = JCOPYOPT_DEFAULT; |
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transformoption.transform = JXFORM_NONE; |
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transformoption.perfect = FALSE; |
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transformoption.trim = FALSE; |
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transformoption.force_grayscale = FALSE; |
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transformoption.crop = FALSE; |
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cinfo->err->trace_level = 0; |
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/* Scan command line options, adjust parameters */ |
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for (argn = 1; argn < argc; argn++) { |
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arg = argv[argn]; |
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if (*arg != '-') { |
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/* Not a switch, must be a file name argument */ |
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if (argn <= last_file_arg_seen) { |
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outfilename = NULL; /* -outfile applies to just one input file */ |
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continue; /* ignore this name if previously processed */ |
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} |
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break; /* else done parsing switches */ |
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} |
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arg++; /* advance past switch marker character */ |
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if (keymatch(arg, "arithmetic", 1)) { |
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/* Use arithmetic coding. */ |
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#ifdef C_ARITH_CODING_SUPPORTED |
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cinfo->arith_code = TRUE; |
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#else |
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fprintf(stderr, "%s: sorry, arithmetic coding not supported\n", |
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progname); |
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exit(EXIT_FAILURE); |
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#endif |
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} else if (keymatch(arg, "copy", 2)) { |
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/* Select which extra markers to copy. */ |
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if (++argn >= argc) /* advance to next argument */ |
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usage(); |
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if (keymatch(argv[argn], "none", 1)) { |
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copyoption = JCOPYOPT_NONE; |
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} else if (keymatch(argv[argn], "comments", 1)) { |
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copyoption = JCOPYOPT_COMMENTS; |
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} else if (keymatch(argv[argn], "all", 1)) { |
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copyoption = JCOPYOPT_ALL; |
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} else |
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usage(); |
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} else if (keymatch(arg, "crop", 2)) { |
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/* Perform lossless cropping. */ |
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#if TRANSFORMS_SUPPORTED |
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if (++argn >= argc) /* advance to next argument */ |
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usage(); |
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if (! jtransform_parse_crop_spec(&transformoption, argv[argn])) { |
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fprintf(stderr, "%s: bogus -crop argument '%s'\n", |
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progname, argv[argn]); |
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exit(EXIT_FAILURE); |
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} |
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#else |
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select_transform(JXFORM_NONE); /* force an error */ |
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#endif |
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} else if (keymatch(arg, "debug", 1) || keymatch(arg, "verbose", 1)) { |
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/* Enable debug printouts. */ |
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/* On first -d, print version identification */ |
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static boolean printed_version = FALSE; |
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if (! printed_version) { |
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fprintf(stderr, "Independent JPEG Group's JPEGTRAN, version %s\n%s\n", |
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JVERSION, JCOPYRIGHT); |
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printed_version = TRUE; |
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} |
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cinfo->err->trace_level++; |
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} else if (keymatch(arg, "flip", 1)) { |
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/* Mirror left-right or top-bottom. */ |
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if (++argn >= argc) /* advance to next argument */ |
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usage(); |
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if (keymatch(argv[argn], "horizontal", 1)) |
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select_transform(JXFORM_FLIP_H); |
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else if (keymatch(argv[argn], "vertical", 1)) |
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select_transform(JXFORM_FLIP_V); |
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else |
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usage(); |
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} else if (keymatch(arg, "grayscale", 1) || keymatch(arg, "greyscale",1)) { |
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/* Force to grayscale. */ |
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#if TRANSFORMS_SUPPORTED |
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transformoption.force_grayscale = TRUE; |
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#else |
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select_transform(JXFORM_NONE); /* force an error */ |
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#endif |
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} else if (keymatch(arg, "maxmemory", 3)) { |
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/* Maximum memory in Kb (or Mb with 'm'). */ |
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long lval; |
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char ch = 'x'; |
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if (++argn >= argc) /* advance to next argument */ |
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usage(); |
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if (sscanf(argv[argn], "%ld%c", &lval, &ch) < 1) |
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usage(); |
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if (ch == 'm' || ch == 'M') |
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lval *= 1000L; |
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cinfo->mem->max_memory_to_use = lval * 1000L; |
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} else if (keymatch(arg, "optimize", 1) || keymatch(arg, "optimise", 1)) { |
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/* Enable entropy parm optimization. */ |
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#ifdef ENTROPY_OPT_SUPPORTED |
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cinfo->optimize_coding = TRUE; |
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#else |
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fprintf(stderr, "%s: sorry, entropy optimization was not compiled\n", |
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progname); |
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exit(EXIT_FAILURE); |
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#endif |
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} else if (keymatch(arg, "outfile", 4)) { |
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/* Set output file name. */ |
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if (++argn >= argc) /* advance to next argument */ |
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usage(); |
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outfilename = argv[argn]; /* save it away for later use */ |
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} else if (keymatch(arg, "perfect", 2)) { |
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/* Fail if there is any partial edge MCUs that the transform can't |
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* handle. */ |
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transformoption.perfect = TRUE; |
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} else if (keymatch(arg, "progressive", 2)) { |
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/* Select simple progressive mode. */ |
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#ifdef C_PROGRESSIVE_SUPPORTED |
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simple_progressive = TRUE; |
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/* We must postpone execution until num_components is known. */ |
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#else |
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fprintf(stderr, "%s: sorry, progressive output was not compiled\n", |
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progname); |
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exit(EXIT_FAILURE); |
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#endif |
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} else if (keymatch(arg, "restart", 1)) { |
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/* Restart interval in MCU rows (or in MCUs with 'b'). */ |
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long lval; |
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char ch = 'x'; |
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if (++argn >= argc) /* advance to next argument */ |
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usage(); |
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if (sscanf(argv[argn], "%ld%c", &lval, &ch) < 1) |
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usage(); |
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if (lval < 0 || lval > 65535L) |
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usage(); |
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if (ch == 'b' || ch == 'B') { |
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cinfo->restart_interval = (unsigned int) lval; |
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cinfo->restart_in_rows = 0; /* else prior '-restart n' overrides me */ |
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} else { |
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cinfo->restart_in_rows = (int) lval; |
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/* restart_interval will be computed during startup */ |
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} |
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} else if (keymatch(arg, "rotate", 2)) { |
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/* Rotate 90, 180, or 270 degrees (measured clockwise). */ |
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if (++argn >= argc) /* advance to next argument */ |
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usage(); |
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if (keymatch(argv[argn], "90", 2)) |
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select_transform(JXFORM_ROT_90); |
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else if (keymatch(argv[argn], "180", 3)) |
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select_transform(JXFORM_ROT_180); |
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else if (keymatch(argv[argn], "270", 3)) |
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select_transform(JXFORM_ROT_270); |
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else |
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usage(); |
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} else if (keymatch(arg, "scale", 4)) { |
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/* Scale the output image by a fraction M/N. */ |
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if (++argn >= argc) /* advance to next argument */ |
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usage(); |
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scaleoption = argv[argn]; |
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/* We must postpone processing until decompression startup. */ |
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} else if (keymatch(arg, "scans", 1)) { |
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/* Set scan script. */ |
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#ifdef C_MULTISCAN_FILES_SUPPORTED |
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if (++argn >= argc) /* advance to next argument */ |
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usage(); |
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scansarg = argv[argn]; |
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/* We must postpone reading the file in case -progressive appears. */ |
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#else |
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fprintf(stderr, "%s: sorry, multi-scan output was not compiled\n", |
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progname); |
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exit(EXIT_FAILURE); |
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#endif |
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} else if (keymatch(arg, "transpose", 1)) { |
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/* Transpose (across UL-to-LR axis). */ |
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select_transform(JXFORM_TRANSPOSE); |
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} else if (keymatch(arg, "transverse", 6)) { |
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/* Transverse transpose (across UR-to-LL axis). */ |
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select_transform(JXFORM_TRANSVERSE); |
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} else if (keymatch(arg, "trim", 3)) { |
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/* Trim off any partial edge MCUs that the transform can't handle. */ |
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transformoption.trim = TRUE; |
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} else { |
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usage(); /* bogus switch */ |
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} |
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} |
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/* Post-switch-scanning cleanup */ |
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if (for_real) { |
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#ifdef C_PROGRESSIVE_SUPPORTED |
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if (simple_progressive) /* process -progressive; -scans can override */ |
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jpeg_simple_progression(cinfo); |
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#endif |
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#ifdef C_MULTISCAN_FILES_SUPPORTED |
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if (scansarg != NULL) /* process -scans if it was present */ |
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if (! read_scan_script(cinfo, scansarg)) |
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usage(); |
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#endif |
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} |
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return argn; /* return index of next arg (file name) */ |
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} |
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/* |
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* The main program. |
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*/ |
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int |
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main (int argc, char **argv) |
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{ |
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struct jpeg_decompress_struct srcinfo; |
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struct jpeg_compress_struct dstinfo; |
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struct jpeg_error_mgr jsrcerr, jdsterr; |
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#ifdef PROGRESS_REPORT |
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struct cdjpeg_progress_mgr progress; |
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#endif |
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jvirt_barray_ptr * src_coef_arrays; |
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jvirt_barray_ptr * dst_coef_arrays; |
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int file_index; |
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/* We assume all-in-memory processing and can therefore use only a |
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* single file pointer for sequential input and output operation. |
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*/ |
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FILE * fp; |
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/* On Mac, fetch a command line. */ |
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#ifdef USE_CCOMMAND |
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argc = ccommand(&argv); |
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#endif |
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progname = argv[0]; |
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if (progname == NULL || progname[0] == 0) |
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progname = "jpegtran"; /* in case C library doesn't provide it */ |
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/* Initialize the JPEG decompression object with default error handling. */ |
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srcinfo.err = jpeg_std_error(&jsrcerr); |
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jpeg_create_decompress(&srcinfo); |
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/* Initialize the JPEG compression object with default error handling. */ |
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dstinfo.err = jpeg_std_error(&jdsterr); |
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jpeg_create_compress(&dstinfo); |
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/* Now safe to enable signal catcher. |
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* Note: we assume only the decompression object will have virtual arrays. |
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*/ |
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#ifdef NEED_SIGNAL_CATCHER |
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enable_signal_catcher((j_common_ptr) &srcinfo); |
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#endif |
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/* Scan command line to find file names. |
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* It is convenient to use just one switch-parsing routine, but the switch |
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* values read here are mostly ignored; we will rescan the switches after |
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* opening the input file. Also note that most of the switches affect the |
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* destination JPEG object, so we parse into that and then copy over what |
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* needs to affects the source too. |
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*/ |
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file_index = parse_switches(&dstinfo, argc, argv, 0, FALSE); |
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jsrcerr.trace_level = jdsterr.trace_level; |
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srcinfo.mem->max_memory_to_use = dstinfo.mem->max_memory_to_use; |
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#ifdef TWO_FILE_COMMANDLINE |
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/* Must have either -outfile switch or explicit output file name */ |
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if (outfilename == NULL) { |
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if (file_index != argc-2) { |
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fprintf(stderr, "%s: must name one input and one output file\n", |
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progname); |
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usage(); |
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} |
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outfilename = argv[file_index+1]; |
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} else { |
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if (file_index != argc-1) { |
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fprintf(stderr, "%s: must name one input and one output file\n", |
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progname); |
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usage(); |
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} |
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} |
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#else |
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/* Unix style: expect zero or one file name */ |
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if (file_index < argc-1) { |
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fprintf(stderr, "%s: only one input file\n", progname); |
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usage(); |
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} |
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#endif /* TWO_FILE_COMMANDLINE */ |
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/* Open the input file. */ |
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if (file_index < argc) { |
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if ((fp = fopen(argv[file_index], READ_BINARY)) == NULL) { |
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fprintf(stderr, "%s: can't open %s for reading\n", progname, argv[file_index]); |
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exit(EXIT_FAILURE); |
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} |
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} else { |
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/* default input file is stdin */ |
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fp = read_stdin(); |
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} |
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#ifdef PROGRESS_REPORT |
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start_progress_monitor((j_common_ptr) &dstinfo, &progress); |
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#endif |
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/* Specify data source for decompression */ |
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jpeg_stdio_src(&srcinfo, fp); |
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/* Enable saving of extra markers that we want to copy */ |
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jcopy_markers_setup(&srcinfo, copyoption); |
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/* Read file header */ |
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(void) jpeg_read_header(&srcinfo, TRUE); |
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/* Adjust default decompression parameters */ |
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if (scaleoption != NULL) |
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if (sscanf(scaleoption, "%d/%d", |
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&srcinfo.scale_num, &srcinfo.scale_denom) < 1) |
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usage(); |
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/* Any space needed by a transform option must be requested before |
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* jpeg_read_coefficients so that memory allocation will be done right. |
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*/ |
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#if TRANSFORMS_SUPPORTED |
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/* Fail right away if -perfect is given and transformation is not perfect. |
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*/ |
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if (!jtransform_request_workspace(&srcinfo, &transformoption)) { |
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fprintf(stderr, "%s: transformation is not perfect\n", progname); |
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exit(EXIT_FAILURE); |
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} |
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#endif |
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/* Read source file as DCT coefficients */ |
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src_coef_arrays = jpeg_read_coefficients(&srcinfo); |
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/* Initialize destination compression parameters from source values */ |
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jpeg_copy_critical_parameters(&srcinfo, &dstinfo); |
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|
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/* Adjust destination parameters if required by transform options; |
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* also find out which set of coefficient arrays will hold the output. |
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*/ |
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#if TRANSFORMS_SUPPORTED |
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dst_coef_arrays = jtransform_adjust_parameters(&srcinfo, &dstinfo, |
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src_coef_arrays, |
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&transformoption); |
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#else |
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dst_coef_arrays = src_coef_arrays; |
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#endif |
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/* Close input file, if we opened it. |
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* Note: we assume that jpeg_read_coefficients consumed all input |
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* until JPEG_REACHED_EOI, and that jpeg_finish_decompress will |
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* only consume more while (! cinfo->inputctl->eoi_reached). |
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* We cannot call jpeg_finish_decompress here since we still need the |
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* virtual arrays allocated from the source object for processing. |
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*/ |
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if (fp != stdin) |
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fclose(fp); |
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|
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/* Open the output file. */ |
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if (outfilename != NULL) { |
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if ((fp = fopen(outfilename, WRITE_BINARY)) == NULL) { |
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fprintf(stderr, "%s: can't open %s for writing\n", progname, outfilename); |
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exit(EXIT_FAILURE); |
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} |
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} else { |
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/* default output file is stdout */ |
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fp = write_stdout(); |
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} |
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/* Adjust default compression parameters by re-parsing the options */ |
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file_index = parse_switches(&dstinfo, argc, argv, 0, TRUE); |
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|
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/* Specify data destination for compression */ |
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jpeg_stdio_dest(&dstinfo, fp); |
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|
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/* Start compressor (note no image data is actually written here) */ |
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jpeg_write_coefficients(&dstinfo, dst_coef_arrays); |
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|
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/* Copy to the output file any extra markers that we want to preserve */ |
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jcopy_markers_execute(&srcinfo, &dstinfo, copyoption); |
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|
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/* Execute image transformation, if any */ |
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#if TRANSFORMS_SUPPORTED |
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jtransform_execute_transformation(&srcinfo, &dstinfo, |
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src_coef_arrays, |
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&transformoption); |
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#endif |
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|
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/* Finish compression and release memory */ |
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jpeg_finish_compress(&dstinfo); |
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jpeg_destroy_compress(&dstinfo); |
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(void) jpeg_finish_decompress(&srcinfo); |
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jpeg_destroy_decompress(&srcinfo); |
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|
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/* Close output file, if we opened it */ |
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if (fp != stdout) |
|
fclose(fp); |
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|
|
#ifdef PROGRESS_REPORT |
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end_progress_monitor((j_common_ptr) &dstinfo); |
|
#endif |
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|
|
/* All done. */ |
|
exit(jsrcerr.num_warnings + jdsterr.num_warnings ?EXIT_WARNING:EXIT_SUCCESS); |
|
return 0; /* suppress no-return-value warnings */ |
|
}
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