1 | /* |
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2 | * jpegtran.c |
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3 | * |
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4 | * Copyright (C) 1995-2001, Thomas G. Lane. |
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5 | * This file is part of the Independent JPEG Group's software. |
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6 | * For conditions of distribution and use, see the accompanying README file. |
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7 | * |
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8 | * This file contains a command-line user interface for JPEG transcoding. |
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9 | * It is very similar to cjpeg.c, but provides lossless transcoding between |
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10 | * different JPEG file formats. It also provides some lossless and sort-of- |
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11 | * lossless transformations of JPEG data. |
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12 | */ |
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13 | |
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14 | #include "cdjpeg.h" /* Common decls for cjpeg/djpeg applications */ |
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15 | #include "transupp.h" /* Support routines for jpegtran */ |
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16 | #include "jversion.h" /* for version message */ |
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17 | |
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18 | #ifdef USE_CCOMMAND /* command-line reader for Macintosh */ |
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19 | #ifdef __MWERKS__ |
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20 | #include <SIOUX.h> /* Metrowerks needs this */ |
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21 | #include <console.h> /* ... and this */ |
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22 | #endif |
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23 | #ifdef THINK_C |
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24 | #include <console.h> /* Think declares it here */ |
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25 | #endif |
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26 | #endif |
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27 | |
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28 | |
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29 | /* |
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30 | * Argument-parsing code. |
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31 | * The switch parser is designed to be useful with DOS-style command line |
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32 | * syntax, ie, intermixed switches and file names, where only the switches |
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33 | * to the left of a given file name affect processing of that file. |
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34 | * The main program in this file doesn't actually use this capability... |
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35 | */ |
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36 | |
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37 | |
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38 | static const char * progname; /* program name for error messages */ |
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39 | static char * outfilename; /* for -outfile switch */ |
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40 | static JCOPY_OPTION copyoption; /* -copy switch */ |
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41 | static jpeg_transform_info transformoption; /* image transformation options */ |
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42 | |
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43 | |
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44 | LOCAL(void) |
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45 | usage (void) |
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46 | /* complain about bad command line */ |
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47 | { |
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48 | fprintf(stderr, "usage: %s [switches] ", progname); |
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49 | #ifdef TWO_FILE_COMMANDLINE |
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50 | fprintf(stderr, "inputfile outputfile\n"); |
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51 | #else |
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52 | fprintf(stderr, "[inputfile]\n"); |
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53 | #endif |
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54 | |
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55 | fprintf(stderr, "Switches (names may be abbreviated):\n"); |
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56 | fprintf(stderr, " -copy none Copy no extra markers from source file\n"); |
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57 | fprintf(stderr, " -copy comments Copy only comment markers (default)\n"); |
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58 | fprintf(stderr, " -copy all Copy all extra markers\n"); |
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59 | #ifdef ENTROPY_OPT_SUPPORTED |
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60 | fprintf(stderr, " -optimize Optimize Huffman table (smaller file, but slow compression)\n"); |
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61 | #endif |
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62 | #ifdef C_PROGRESSIVE_SUPPORTED |
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63 | fprintf(stderr, " -progressive Create progressive JPEG file\n"); |
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64 | #endif |
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65 | #if TRANSFORMS_SUPPORTED |
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66 | fprintf(stderr, "Switches for modifying the image:\n"); |
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67 | fprintf(stderr, " -crop WxH+X+Y Crop to a rectangular subarea\n"); |
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68 | fprintf(stderr, " -grayscale Reduce to grayscale (omit color data)\n"); |
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69 | fprintf(stderr, " -flip [horizontal|vertical] Mirror image (left-right or top-bottom)\n"); |
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70 | fprintf(stderr, " -perfect Fail if there is non-transformable edge blocks\n"); |
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71 | fprintf(stderr, " -rotate [90|180|270] Rotate image (degrees clockwise)\n"); |
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72 | fprintf(stderr, " -transpose Transpose image\n"); |
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73 | fprintf(stderr, " -transverse Transverse transpose image\n"); |
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74 | fprintf(stderr, " -trim Drop non-transformable edge blocks\n"); |
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75 | #endif /* TRANSFORMS_SUPPORTED */ |
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76 | fprintf(stderr, "Switches for advanced users:\n"); |
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77 | fprintf(stderr, " -restart N Set restart interval in rows, or in blocks with B\n"); |
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78 | fprintf(stderr, " -maxmemory N Maximum memory to use (in kbytes)\n"); |
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79 | fprintf(stderr, " -outfile name Specify name for output file\n"); |
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80 | fprintf(stderr, " -verbose or -debug Emit debug output\n"); |
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81 | fprintf(stderr, "Switches for wizards:\n"); |
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82 | #ifdef C_ARITH_CODING_SUPPORTED |
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83 | fprintf(stderr, " -arithmetic Use arithmetic coding\n"); |
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84 | #endif |
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85 | #ifdef C_MULTISCAN_FILES_SUPPORTED |
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86 | fprintf(stderr, " -scans file Create multi-scan JPEG per script file\n"); |
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87 | #endif |
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88 | exit(EXIT_FAILURE); |
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89 | } |
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90 | |
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91 | |
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92 | LOCAL(void) |
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93 | select_transform (JXFORM_CODE transform) |
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94 | /* Silly little routine to detect multiple transform options, |
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95 | * which we can't handle. |
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96 | */ |
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97 | { |
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98 | #if TRANSFORMS_SUPPORTED |
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99 | if (transformoption.transform == JXFORM_NONE || |
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100 | transformoption.transform == transform) { |
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101 | transformoption.transform = transform; |
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102 | } else { |
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103 | fprintf(stderr, "%s: can only do one image transformation at a time\n", |
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104 | progname); |
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105 | usage(); |
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106 | } |
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107 | #else |
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108 | fprintf(stderr, "%s: sorry, image transformation was not compiled\n", |
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109 | progname); |
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110 | exit(EXIT_FAILURE); |
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111 | #endif |
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112 | } |
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113 | |
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114 | |
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115 | LOCAL(int) |
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116 | parse_switches (j_compress_ptr cinfo, int argc, char **argv, |
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117 | int last_file_arg_seen, boolean for_real) |
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118 | /* Parse optional switches. |
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119 | * Returns argv[] index of first file-name argument (== argc if none). |
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120 | * Any file names with indexes <= last_file_arg_seen are ignored; |
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121 | * they have presumably been processed in a previous iteration. |
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122 | * (Pass 0 for last_file_arg_seen on the first or only iteration.) |
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123 | * for_real is FALSE on the first (dummy) pass; we may skip any expensive |
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124 | * processing. |
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125 | */ |
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126 | { |
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127 | int argn; |
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128 | char * arg; |
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129 | boolean simple_progressive; |
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130 | char * scansarg = NULL; /* saves -scans parm if any */ |
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131 | |
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132 | /* Set up default JPEG parameters. */ |
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133 | simple_progressive = FALSE; |
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134 | outfilename = NULL; |
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135 | copyoption = JCOPYOPT_DEFAULT; |
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136 | transformoption.transform = JXFORM_NONE; |
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137 | transformoption.trim = FALSE; |
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138 | transformoption.perfect = FALSE; |
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139 | transformoption.force_grayscale = FALSE; |
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140 | transformoption.crop = FALSE; |
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141 | cinfo->err->trace_level = 0; |
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142 | |
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143 | /* Scan command line options, adjust parameters */ |
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144 | |
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145 | for (argn = 1; argn < argc; argn++) { |
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146 | arg = argv[argn]; |
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147 | if (*arg != '-') { |
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148 | /* Not a switch, must be a file name argument */ |
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149 | if (argn <= last_file_arg_seen) { |
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150 | outfilename = NULL; /* -outfile applies to just one input file */ |
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151 | continue; /* ignore this name if previously processed */ |
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152 | } |
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153 | break; /* else done parsing switches */ |
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154 | } |
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155 | arg++; /* advance past switch marker character */ |
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156 | |
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157 | if (keymatch(arg, "arithmetic", 1)) { |
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158 | /* Use arithmetic coding. */ |
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159 | #ifdef C_ARITH_CODING_SUPPORTED |
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160 | cinfo->arith_code = TRUE; |
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161 | #else |
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162 | fprintf(stderr, "%s: sorry, arithmetic coding not supported\n", |
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163 | progname); |
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164 | exit(EXIT_FAILURE); |
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165 | #endif |
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166 | |
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167 | } else if (keymatch(arg, "copy", 2)) { |
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168 | /* Select which extra markers to copy. */ |
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169 | if (++argn >= argc) /* advance to next argument */ |
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170 | usage(); |
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171 | if (keymatch(argv[argn], "none", 1)) { |
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172 | copyoption = JCOPYOPT_NONE; |
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173 | } else if (keymatch(argv[argn], "comments", 1)) { |
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174 | copyoption = JCOPYOPT_COMMENTS; |
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175 | } else if (keymatch(argv[argn], "all", 1)) { |
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176 | copyoption = JCOPYOPT_ALL; |
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177 | } else |
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178 | usage(); |
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179 | |
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180 | } else if (keymatch(arg, "crop", 2)) { |
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181 | /* Perform lossless cropping. */ |
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182 | #if TRANSFORMS_SUPPORTED |
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183 | if (++argn >= argc) /* advance to next argument */ |
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184 | usage(); |
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185 | if (! jtransform_parse_crop_spec(&transformoption, argv[argn])) { |
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186 | fprintf(stderr, "%s: bogus -crop argument '%s'\n", |
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187 | progname, argv[argn]); |
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188 | exit(EXIT_FAILURE); |
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189 | } |
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190 | #else |
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191 | select_transform(JXFORM_NONE); /* force an error */ |
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192 | #endif |
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193 | |
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194 | } else if (keymatch(arg, "debug", 1) || keymatch(arg, "verbose", 1)) { |
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195 | /* Enable debug printouts. */ |
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196 | /* On first -d, print version identification */ |
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197 | static boolean printed_version = FALSE; |
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198 | |
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199 | if (! printed_version) { |
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200 | fprintf(stderr, "Independent JPEG Group's JPEGTRAN, version %s\n%s\n", |
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201 | JVERSION, JCOPYRIGHT); |
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202 | printed_version = TRUE; |
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203 | } |
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204 | cinfo->err->trace_level++; |
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205 | |
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206 | } else if (keymatch(arg, "flip", 1)) { |
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207 | /* Mirror left-right or top-bottom. */ |
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208 | if (++argn >= argc) /* advance to next argument */ |
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209 | usage(); |
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210 | if (keymatch(argv[argn], "horizontal", 1)) |
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211 | select_transform(JXFORM_FLIP_H); |
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212 | else if (keymatch(argv[argn], "vertical", 1)) |
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213 | select_transform(JXFORM_FLIP_V); |
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214 | else |
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215 | usage(); |
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216 | |
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217 | } else if (keymatch(arg, "grayscale", 1) || keymatch(arg, "greyscale",1)) { |
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218 | /* Force to grayscale. */ |
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219 | #if TRANSFORMS_SUPPORTED |
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220 | transformoption.force_grayscale = TRUE; |
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221 | #else |
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222 | select_transform(JXFORM_NONE); /* force an error */ |
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223 | #endif |
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224 | |
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225 | } else if (keymatch(arg, "maxmemory", 3)) { |
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226 | /* Maximum memory in Kb (or Mb with 'm'). */ |
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227 | long lval; |
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228 | char ch = 'x'; |
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229 | |
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230 | if (++argn >= argc) /* advance to next argument */ |
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231 | usage(); |
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232 | if (sscanf(argv[argn], "%ld%c", &lval, &ch) < 1) |
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233 | usage(); |
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234 | if (ch == 'm' || ch == 'M') |
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235 | lval *= 1000L; |
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236 | cinfo->mem->max_memory_to_use = lval * 1000L; |
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237 | |
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238 | } else if (keymatch(arg, "optimize", 1) || keymatch(arg, "optimise", 1)) { |
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239 | /* Enable entropy parm optimization. */ |
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240 | #ifdef ENTROPY_OPT_SUPPORTED |
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241 | cinfo->optimize_coding = TRUE; |
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242 | #else |
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243 | fprintf(stderr, "%s: sorry, entropy optimization was not compiled\n", |
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244 | progname); |
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245 | exit(EXIT_FAILURE); |
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246 | #endif |
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247 | |
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248 | } else if (keymatch(arg, "outfile", 4)) { |
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249 | /* Set output file name. */ |
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250 | if (++argn >= argc) /* advance to next argument */ |
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251 | usage(); |
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252 | outfilename = argv[argn]; /* save it away for later use */ |
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253 | |
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254 | } else if (keymatch(arg, "perfect", 2)) { |
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255 | /* Fail if there is any partial edge MCUs that the transform can't |
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256 | * handle. */ |
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257 | transformoption.perfect = TRUE; |
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258 | |
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259 | } else if (keymatch(arg, "progressive", 2)) { |
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260 | /* Select simple progressive mode. */ |
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261 | #ifdef C_PROGRESSIVE_SUPPORTED |
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262 | simple_progressive = TRUE; |
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263 | /* We must postpone execution until num_components is known. */ |
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264 | #else |
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265 | fprintf(stderr, "%s: sorry, progressive output was not compiled\n", |
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266 | progname); |
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267 | exit(EXIT_FAILURE); |
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268 | #endif |
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269 | |
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270 | } else if (keymatch(arg, "restart", 1)) { |
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271 | /* Restart interval in MCU rows (or in MCUs with 'b'). */ |
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272 | long lval; |
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273 | char ch = 'x'; |
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274 | |
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275 | if (++argn >= argc) /* advance to next argument */ |
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276 | usage(); |
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277 | if (sscanf(argv[argn], "%ld%c", &lval, &ch) < 1) |
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278 | usage(); |
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279 | if (lval < 0 || lval > 65535L) |
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280 | usage(); |
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281 | if (ch == 'b' || ch == 'B') { |
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282 | cinfo->restart_interval = (unsigned int) lval; |
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283 | cinfo->restart_in_rows = 0; /* else prior '-restart n' overrides me */ |
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284 | } else { |
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285 | cinfo->restart_in_rows = (int) lval; |
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286 | /* restart_interval will be computed during startup */ |
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287 | } |
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288 | |
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289 | } else if (keymatch(arg, "rotate", 2)) { |
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290 | /* Rotate 90, 180, or 270 degrees (measured clockwise). */ |
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291 | if (++argn >= argc) /* advance to next argument */ |
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292 | usage(); |
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293 | if (keymatch(argv[argn], "90", 2)) |
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294 | select_transform(JXFORM_ROT_90); |
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295 | else if (keymatch(argv[argn], "180", 3)) |
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296 | select_transform(JXFORM_ROT_180); |
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297 | else if (keymatch(argv[argn], "270", 3)) |
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298 | select_transform(JXFORM_ROT_270); |
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299 | else |
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300 | usage(); |
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301 | |
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302 | } else if (keymatch(arg, "scans", 1)) { |
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303 | /* Set scan script. */ |
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304 | #ifdef C_MULTISCAN_FILES_SUPPORTED |
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305 | if (++argn >= argc) /* advance to next argument */ |
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306 | usage(); |
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307 | scansarg = argv[argn]; |
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308 | /* We must postpone reading the file in case -progressive appears. */ |
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309 | #else |
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310 | fprintf(stderr, "%s: sorry, multi-scan output was not compiled\n", |
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311 | progname); |
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312 | exit(EXIT_FAILURE); |
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313 | #endif |
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314 | |
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315 | } else if (keymatch(arg, "transpose", 1)) { |
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316 | /* Transpose (across UL-to-LR axis). */ |
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317 | select_transform(JXFORM_TRANSPOSE); |
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318 | |
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319 | } else if (keymatch(arg, "transverse", 6)) { |
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320 | /* Transverse transpose (across UR-to-LL axis). */ |
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321 | select_transform(JXFORM_TRANSVERSE); |
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322 | |
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323 | } else if (keymatch(arg, "trim", 3)) { |
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324 | /* Trim off any partial edge MCUs that the transform can't handle. */ |
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325 | transformoption.trim = TRUE; |
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326 | |
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327 | } else { |
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328 | usage(); /* bogus switch */ |
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329 | } |
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330 | } |
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331 | |
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332 | /* Post-switch-scanning cleanup */ |
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333 | |
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334 | if (for_real) { |
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335 | |
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336 | #ifdef C_PROGRESSIVE_SUPPORTED |
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337 | if (simple_progressive) /* process -progressive; -scans can override */ |
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338 | jpeg_simple_progression(cinfo); |
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339 | #endif |
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340 | |
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341 | #ifdef C_MULTISCAN_FILES_SUPPORTED |
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342 | if (scansarg != NULL) /* process -scans if it was present */ |
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343 | if (! read_scan_script(cinfo, scansarg)) |
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344 | usage(); |
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345 | #endif |
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346 | } |
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347 | |
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348 | return argn; /* return index of next arg (file name) */ |
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349 | } |
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350 | |
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351 | |
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352 | /* |
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353 | * The main program. |
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354 | */ |
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355 | |
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356 | int |
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357 | main (int argc, char **argv) |
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358 | { |
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359 | struct jpeg_decompress_struct srcinfo; |
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360 | struct jpeg_compress_struct dstinfo; |
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361 | struct jpeg_error_mgr jsrcerr, jdsterr; |
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362 | #ifdef PROGRESS_REPORT |
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363 | struct cdjpeg_progress_mgr progress; |
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364 | #endif |
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365 | jvirt_barray_ptr * src_coef_arrays; |
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366 | jvirt_barray_ptr * dst_coef_arrays; |
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367 | int file_index; |
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368 | /* We assume all-in-memory processing and can therefore use only a |
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369 | * single file pointer for sequential input and output operation. |
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370 | */ |
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371 | FILE * fp; |
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372 | |
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373 | /* On Mac, fetch a command line. */ |
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374 | #ifdef USE_CCOMMAND |
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375 | argc = ccommand(&argv); |
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376 | #endif |
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377 | |
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378 | progname = argv[0]; |
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379 | if (progname == NULL || progname[0] == 0) |
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380 | progname = "jpegtran"; /* in case C library doesn't provide it */ |
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381 | |
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382 | /* Initialize the JPEG decompression object with default error handling. */ |
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383 | srcinfo.err = jpeg_std_error(&jsrcerr); |
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384 | jpeg_create_decompress(&srcinfo); |
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385 | /* Initialize the JPEG compression object with default error handling. */ |
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386 | dstinfo.err = jpeg_std_error(&jdsterr); |
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387 | jpeg_create_compress(&dstinfo); |
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388 | |
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389 | /* Now safe to enable signal catcher. |
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390 | * Note: we assume only the decompression object will have virtual arrays. |
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391 | */ |
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392 | #ifdef NEED_SIGNAL_CATCHER |
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393 | enable_signal_catcher((j_common_ptr) &srcinfo); |
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394 | #endif |
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395 | |
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396 | /* Scan command line to find file names. |
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397 | * It is convenient to use just one switch-parsing routine, but the switch |
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398 | * values read here are mostly ignored; we will rescan the switches after |
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399 | * opening the input file. Also note that most of the switches affect the |
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400 | * destination JPEG object, so we parse into that and then copy over what |
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401 | * needs to affects the source too. |
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402 | */ |
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403 | |
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404 | file_index = parse_switches(&dstinfo, argc, argv, 0, FALSE); |
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405 | jsrcerr.trace_level = jdsterr.trace_level; |
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406 | srcinfo.mem->max_memory_to_use = dstinfo.mem->max_memory_to_use; |
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407 | |
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408 | #ifdef TWO_FILE_COMMANDLINE |
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409 | /* Must have either -outfile switch or explicit output file name */ |
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410 | if (outfilename == NULL) { |
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411 | if (file_index != argc-2) { |
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412 | fprintf(stderr, "%s: must name one input and one output file\n", |
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413 | progname); |
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414 | usage(); |
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415 | } |
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416 | outfilename = argv[file_index+1]; |
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417 | } else { |
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418 | if (file_index != argc-1) { |
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419 | fprintf(stderr, "%s: must name one input and one output file\n", |
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420 | progname); |
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421 | usage(); |
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422 | } |
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423 | } |
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424 | #else |
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425 | /* Unix style: expect zero or one file name */ |
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426 | if (file_index < argc-1) { |
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427 | fprintf(stderr, "%s: only one input file\n", progname); |
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428 | usage(); |
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429 | } |
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430 | #endif /* TWO_FILE_COMMANDLINE */ |
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431 | |
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432 | /* Open the input file. */ |
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433 | if (file_index < argc) { |
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434 | if ((fp = fopen(argv[file_index], READ_BINARY)) == NULL) { |
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435 | fprintf(stderr, "%s: can't open %s for reading\n", progname, argv[file_index]); |
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436 | exit(EXIT_FAILURE); |
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437 | } |
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438 | } else { |
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439 | /* default input file is stdin */ |
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440 | fp = read_stdin(); |
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441 | } |
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442 | |
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443 | #ifdef PROGRESS_REPORT |
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444 | start_progress_monitor((j_common_ptr) &dstinfo, &progress); |
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445 | #endif |
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446 | |
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447 | /* Specify data source for decompression */ |
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448 | jpeg_stdio_src(&srcinfo, fp); |
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449 | |
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450 | /* Enable saving of extra markers that we want to copy */ |
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451 | jcopy_markers_setup(&srcinfo, copyoption); |
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452 | |
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453 | /* Read file header */ |
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454 | (void) jpeg_read_header(&srcinfo, TRUE); |
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455 | |
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456 | /* Any space needed by a transform option must be requested before |
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457 | * jpeg_read_coefficients so that memory allocation will be done right. |
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458 | */ |
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459 | #if TRANSFORMS_SUPPORTED |
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460 | /* Fails right away if -perfect is given and transformation is not perfect. |
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461 | */ |
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462 | if (transformoption.perfect && |
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463 | !jtransform_perfect_transform(srcinfo.image_width, srcinfo.image_height, |
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464 | srcinfo.max_h_samp_factor * DCTSIZE, srcinfo.max_v_samp_factor * DCTSIZE, |
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465 | transformoption.transform)) { |
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466 | fprintf(stderr, "%s: transformation is not perfect\n", progname); |
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467 | exit(EXIT_FAILURE); |
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468 | } |
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469 | jtransform_request_workspace(&srcinfo, &transformoption); |
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470 | #endif |
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471 | |
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472 | /* Read source file as DCT coefficients */ |
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473 | src_coef_arrays = jpeg_read_coefficients(&srcinfo); |
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474 | |
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475 | /* Initialize destination compression parameters from source values */ |
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476 | jpeg_copy_critical_parameters(&srcinfo, &dstinfo); |
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477 | |
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478 | /* Adjust destination parameters if required by transform options; |
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479 | * also find out which set of coefficient arrays will hold the output. |
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480 | */ |
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481 | #if TRANSFORMS_SUPPORTED |
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482 | dst_coef_arrays = jtransform_adjust_parameters(&srcinfo, &dstinfo, |
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483 | src_coef_arrays, |
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484 | &transformoption); |
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485 | #else |
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486 | dst_coef_arrays = src_coef_arrays; |
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487 | #endif |
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488 | |
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489 | /* Close input file, if we opened it. |
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490 | * Note: we assume that jpeg_read_coefficients consumed all input |
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491 | * until JPEG_REACHED_EOI, and that jpeg_finish_decompress will |
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492 | * only consume more while (! cinfo->inputctl->eoi_reached). |
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493 | * We cannot call jpeg_finish_decompress here since we still need the |
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494 | * virtual arrays allocated from the source object for processing. |
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495 | */ |
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496 | if (fp != stdin) |
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497 | fclose(fp); |
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498 | |
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499 | /* Open the output file. */ |
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500 | if (outfilename != NULL) { |
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501 | if ((fp = fopen(outfilename, WRITE_BINARY)) == NULL) { |
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502 | fprintf(stderr, "%s: can't open %s for writing\n", progname, outfilename); |
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503 | exit(EXIT_FAILURE); |
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504 | } |
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505 | } else { |
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506 | /* default output file is stdout */ |
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507 | fp = write_stdout(); |
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508 | } |
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509 | |
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510 | /* Adjust default compression parameters by re-parsing the options */ |
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511 | file_index = parse_switches(&dstinfo, argc, argv, 0, TRUE); |
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512 | |
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513 | /* Specify data destination for compression */ |
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514 | jpeg_stdio_dest(&dstinfo, fp); |
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515 | |
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516 | /* Start compressor (note no image data is actually written here) */ |
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517 | jpeg_write_coefficients(&dstinfo, dst_coef_arrays); |
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518 | |
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519 | /* Copy to the output file any extra markers that we want to preserve */ |
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520 | jcopy_markers_execute(&srcinfo, &dstinfo, copyoption); |
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521 | |
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522 | /* Execute image transformation, if any */ |
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523 | #if TRANSFORMS_SUPPORTED |
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524 | jtransform_execute_transformation(&srcinfo, &dstinfo, |
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525 | src_coef_arrays, |
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526 | &transformoption); |
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527 | #endif |
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528 | |
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529 | /* Finish compression and release memory */ |
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530 | jpeg_finish_compress(&dstinfo); |
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531 | jpeg_destroy_compress(&dstinfo); |
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532 | (void) jpeg_finish_decompress(&srcinfo); |
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533 | jpeg_destroy_decompress(&srcinfo); |
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534 | |
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535 | /* Close output file, if we opened it */ |
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536 | if (fp != stdout) |
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537 | fclose(fp); |
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538 | |
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539 | #ifdef PROGRESS_REPORT |
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540 | end_progress_monitor((j_common_ptr) &dstinfo); |
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541 | #endif |
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542 | |
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543 | /* All done. */ |
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544 | exit(jsrcerr.num_warnings + jdsterr.num_warnings ?EXIT_WARNING:EXIT_SUCCESS); |
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545 | return 0; /* suppress no-return-value warnings */ |
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546 | } |
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