source: trunk/libjpeg/cjpeg.c @ 283

Last change on this file since 283 was 283, checked in by rbri, 12 years ago

JPEG plugin: libjpeg updated to version 7

File size: 20.2 KB
Line 
1/*
2 * cjpeg.c
3 *
4 * Copyright (C) 1991-1998, Thomas G. Lane.
5 * Modified 2003-2008 by Guido Vollbeding.
6 * This file is part of the Independent JPEG Group's software.
7 * For conditions of distribution and use, see the accompanying README file.
8 *
9 * This file contains a command-line user interface for the JPEG compressor.
10 * It should work on any system with Unix- or MS-DOS-style command lines.
11 *
12 * Two different command line styles are permitted, depending on the
13 * compile-time switch TWO_FILE_COMMANDLINE:
14 *      cjpeg [options]  inputfile outputfile
15 *      cjpeg [options]  [inputfile]
16 * In the second style, output is always to standard output, which you'd
17 * normally redirect to a file or pipe to some other program.  Input is
18 * either from a named file or from standard input (typically redirected).
19 * The second style is convenient on Unix but is unhelpful on systems that
20 * don't support pipes.  Also, you MUST use the first style if your system
21 * doesn't do binary I/O to stdin/stdout.
22 * To simplify script writing, the "-outfile" switch is provided.  The syntax
23 *      cjpeg [options]  -outfile outputfile  inputfile
24 * works regardless of which command line style is used.
25 */
26
27#include "cdjpeg.h"             /* Common decls for cjpeg/djpeg applications */
28#include "jversion.h"           /* for version message */
29
30#ifdef USE_CCOMMAND             /* command-line reader for Macintosh */
31#ifdef __MWERKS__
32#include <SIOUX.h>              /* Metrowerks needs this */
33#include <console.h>            /* ... and this */
34#endif
35#ifdef THINK_C
36#include <console.h>            /* Think declares it here */
37#endif
38#endif
39
40
41/* Create the add-on message string table. */
42
43#define JMESSAGE(code,string)   string ,
44
45static const char * const cdjpeg_message_table[] = {
46#include "cderror.h"
47  NULL
48};
49
50
51/*
52 * This routine determines what format the input file is,
53 * and selects the appropriate input-reading module.
54 *
55 * To determine which family of input formats the file belongs to,
56 * we may look only at the first byte of the file, since C does not
57 * guarantee that more than one character can be pushed back with ungetc.
58 * Looking at additional bytes would require one of these approaches:
59 *     1) assume we can fseek() the input file (fails for piped input);
60 *     2) assume we can push back more than one character (works in
61 *        some C implementations, but unportable);
62 *     3) provide our own buffering (breaks input readers that want to use
63 *        stdio directly, such as the RLE library);
64 * or  4) don't put back the data, and modify the input_init methods to assume
65 *        they start reading after the start of file (also breaks RLE library).
66 * #1 is attractive for MS-DOS but is untenable on Unix.
67 *
68 * The most portable solution for file types that can't be identified by their
69 * first byte is to make the user tell us what they are.  This is also the
70 * only approach for "raw" file types that contain only arbitrary values.
71 * We presently apply this method for Targa files.  Most of the time Targa
72 * files start with 0x00, so we recognize that case.  Potentially, however,
73 * a Targa file could start with any byte value (byte 0 is the length of the
74 * seldom-used ID field), so we provide a switch to force Targa input mode.
75 */
76
77static boolean is_targa;        /* records user -targa switch */
78
79
80LOCAL(cjpeg_source_ptr)
81select_file_type (j_compress_ptr cinfo, FILE * infile)
82{
83  int c;
84
85  if (is_targa) {
86#ifdef TARGA_SUPPORTED
87    return jinit_read_targa(cinfo);
88#else
89    ERREXIT(cinfo, JERR_TGA_NOTCOMP);
90#endif
91  }
92
93  if ((c = getc(infile)) == EOF)
94    ERREXIT(cinfo, JERR_INPUT_EMPTY);
95  if (ungetc(c, infile) == EOF)
96    ERREXIT(cinfo, JERR_UNGETC_FAILED);
97
98  switch (c) {
99#ifdef BMP_SUPPORTED
100  case 'B':
101    return jinit_read_bmp(cinfo);
102#endif
103#ifdef GIF_SUPPORTED
104  case 'G':
105    return jinit_read_gif(cinfo);
106#endif
107#ifdef PPM_SUPPORTED
108  case 'P':
109    return jinit_read_ppm(cinfo);
110#endif
111#ifdef RLE_SUPPORTED
112  case 'R':
113    return jinit_read_rle(cinfo);
114#endif
115#ifdef TARGA_SUPPORTED
116  case 0x00:
117    return jinit_read_targa(cinfo);
118#endif
119  default:
120    ERREXIT(cinfo, JERR_UNKNOWN_FORMAT);
121    break;
122  }
123
124  return NULL;                  /* suppress compiler warnings */
125}
126
127
128/*
129 * Argument-parsing code.
130 * The switch parser is designed to be useful with DOS-style command line
131 * syntax, ie, intermixed switches and file names, where only the switches
132 * to the left of a given file name affect processing of that file.
133 * The main program in this file doesn't actually use this capability...
134 */
135
136
137static const char * progname;   /* program name for error messages */
138static char * outfilename;      /* for -outfile switch */
139
140
141LOCAL(void)
142usage (void)
143/* complain about bad command line */
144{
145  fprintf(stderr, "usage: %s [switches] ", progname);
146#ifdef TWO_FILE_COMMANDLINE
147  fprintf(stderr, "inputfile outputfile\n");
148#else
149  fprintf(stderr, "[inputfile]\n");
150#endif
151
152  fprintf(stderr, "Switches (names may be abbreviated):\n");
153  fprintf(stderr, "  -quality N[,...]   Compression quality (0..100; 5-95 is useful range)\n");
154  fprintf(stderr, "  -grayscale     Create monochrome JPEG file\n");
155#ifdef ENTROPY_OPT_SUPPORTED
156  fprintf(stderr, "  -optimize      Optimize Huffman table (smaller file, but slow compression)\n");
157#endif
158#ifdef C_PROGRESSIVE_SUPPORTED
159  fprintf(stderr, "  -progressive   Create progressive JPEG file\n");
160#endif
161#ifdef DCT_SCALING_SUPPORTED
162  fprintf(stderr, "  -scale M/N     Scale image by fraction M/N, eg, 1/2\n");
163#endif
164#ifdef TARGA_SUPPORTED
165  fprintf(stderr, "  -targa         Input file is Targa format (usually not needed)\n");
166#endif
167  fprintf(stderr, "Switches for advanced users:\n");
168#ifdef DCT_ISLOW_SUPPORTED
169  fprintf(stderr, "  -dct int       Use integer DCT method%s\n",
170          (JDCT_DEFAULT == JDCT_ISLOW ? " (default)" : ""));
171#endif
172#ifdef DCT_IFAST_SUPPORTED
173  fprintf(stderr, "  -dct fast      Use fast integer DCT (less accurate)%s\n",
174          (JDCT_DEFAULT == JDCT_IFAST ? " (default)" : ""));
175#endif
176#ifdef DCT_FLOAT_SUPPORTED
177  fprintf(stderr, "  -dct float     Use floating-point DCT method%s\n",
178          (JDCT_DEFAULT == JDCT_FLOAT ? " (default)" : ""));
179#endif
180  fprintf(stderr, "  -nosmooth      Don't use high-quality downsampling\n");
181  fprintf(stderr, "  -restart N     Set restart interval in rows, or in blocks with B\n");
182#ifdef INPUT_SMOOTHING_SUPPORTED
183  fprintf(stderr, "  -smooth N      Smooth dithered input (N=1..100 is strength)\n");
184#endif
185  fprintf(stderr, "  -maxmemory N   Maximum memory to use (in kbytes)\n");
186  fprintf(stderr, "  -outfile name  Specify name for output file\n");
187  fprintf(stderr, "  -verbose  or  -debug   Emit debug output\n");
188  fprintf(stderr, "Switches for wizards:\n");
189#ifdef C_ARITH_CODING_SUPPORTED
190  fprintf(stderr, "  -arithmetic    Use arithmetic coding\n");
191#endif
192  fprintf(stderr, "  -baseline      Force baseline quantization tables\n");
193  fprintf(stderr, "  -qtables file  Use quantization tables given in file\n");
194  fprintf(stderr, "  -qslots N[,...]    Set component quantization tables\n");
195  fprintf(stderr, "  -sample HxV[,...]  Set component sampling factors\n");
196#ifdef C_MULTISCAN_FILES_SUPPORTED
197  fprintf(stderr, "  -scans file    Create multi-scan JPEG per script file\n");
198#endif
199  exit(EXIT_FAILURE);
200}
201
202
203LOCAL(int)
204parse_switches (j_compress_ptr cinfo, int argc, char **argv,
205                int last_file_arg_seen, boolean for_real)
206/* Parse optional switches.
207 * Returns argv[] index of first file-name argument (== argc if none).
208 * Any file names with indexes <= last_file_arg_seen are ignored;
209 * they have presumably been processed in a previous iteration.
210 * (Pass 0 for last_file_arg_seen on the first or only iteration.)
211 * for_real is FALSE on the first (dummy) pass; we may skip any expensive
212 * processing.
213 */
214{
215  int argn;
216  char * arg;
217  boolean force_baseline;
218  boolean simple_progressive;
219  char * qualityarg = NULL;     /* saves -quality parm if any */
220  char * qtablefile = NULL;     /* saves -qtables filename if any */
221  char * qslotsarg = NULL;      /* saves -qslots parm if any */
222  char * samplearg = NULL;      /* saves -sample parm if any */
223  char * scansarg = NULL;       /* saves -scans parm if any */
224
225  /* Set up default JPEG parameters. */
226
227  force_baseline = FALSE;       /* by default, allow 16-bit quantizers */
228  simple_progressive = FALSE;
229  is_targa = FALSE;
230  outfilename = NULL;
231  cinfo->err->trace_level = 0;
232
233  /* Scan command line options, adjust parameters */
234
235  for (argn = 1; argn < argc; argn++) {
236    arg = argv[argn];
237    if (*arg != '-') {
238      /* Not a switch, must be a file name argument */
239      if (argn <= last_file_arg_seen) {
240        outfilename = NULL;     /* -outfile applies to just one input file */
241        continue;               /* ignore this name if previously processed */
242      }
243      break;                    /* else done parsing switches */
244    }
245    arg++;                      /* advance past switch marker character */
246
247    if (keymatch(arg, "arithmetic", 1)) {
248      /* Use arithmetic coding. */
249#ifdef C_ARITH_CODING_SUPPORTED
250      cinfo->arith_code = TRUE;
251#else
252      fprintf(stderr, "%s: sorry, arithmetic coding not supported\n",
253              progname);
254      exit(EXIT_FAILURE);
255#endif
256
257    } else if (keymatch(arg, "baseline", 1)) {
258      /* Force baseline-compatible output (8-bit quantizer values). */
259      force_baseline = TRUE;
260
261    } else if (keymatch(arg, "dct", 2)) {
262      /* Select DCT algorithm. */
263      if (++argn >= argc)       /* advance to next argument */
264        usage();
265      if (keymatch(argv[argn], "int", 1)) {
266        cinfo->dct_method = JDCT_ISLOW;
267      } else if (keymatch(argv[argn], "fast", 2)) {
268        cinfo->dct_method = JDCT_IFAST;
269      } else if (keymatch(argv[argn], "float", 2)) {
270        cinfo->dct_method = JDCT_FLOAT;
271      } else
272        usage();
273
274    } else if (keymatch(arg, "debug", 1) || keymatch(arg, "verbose", 1)) {
275      /* Enable debug printouts. */
276      /* On first -d, print version identification */
277      static boolean printed_version = FALSE;
278
279      if (! printed_version) {
280        fprintf(stderr, "Independent JPEG Group's CJPEG, version %s\n%s\n",
281                JVERSION, JCOPYRIGHT);
282        printed_version = TRUE;
283      }
284      cinfo->err->trace_level++;
285
286    } else if (keymatch(arg, "grayscale", 2) || keymatch(arg, "greyscale",2)) {
287      /* Force a monochrome JPEG file to be generated. */
288      jpeg_set_colorspace(cinfo, JCS_GRAYSCALE);
289
290    } else if (keymatch(arg, "maxmemory", 3)) {
291      /* Maximum memory in Kb (or Mb with 'm'). */
292      long lval;
293      char ch = 'x';
294
295      if (++argn >= argc)       /* advance to next argument */
296        usage();
297      if (sscanf(argv[argn], "%ld%c", &lval, &ch) < 1)
298        usage();
299      if (ch == 'm' || ch == 'M')
300        lval *= 1000L;
301      cinfo->mem->max_memory_to_use = lval * 1000L;
302
303    } else if (keymatch(arg, "nosmooth", 3)) {
304      /* Suppress fancy downsampling */
305      cinfo->do_fancy_downsampling = FALSE;
306
307    } else if (keymatch(arg, "optimize", 1) || keymatch(arg, "optimise", 1)) {
308      /* Enable entropy parm optimization. */
309#ifdef ENTROPY_OPT_SUPPORTED
310      cinfo->optimize_coding = TRUE;
311#else
312      fprintf(stderr, "%s: sorry, entropy optimization was not compiled\n",
313              progname);
314      exit(EXIT_FAILURE);
315#endif
316
317    } else if (keymatch(arg, "outfile", 4)) {
318      /* Set output file name. */
319      if (++argn >= argc)       /* advance to next argument */
320        usage();
321      outfilename = argv[argn]; /* save it away for later use */
322
323    } else if (keymatch(arg, "progressive", 1)) {
324      /* Select simple progressive mode. */
325#ifdef C_PROGRESSIVE_SUPPORTED
326      simple_progressive = TRUE;
327      /* We must postpone execution until num_components is known. */
328#else
329      fprintf(stderr, "%s: sorry, progressive output was not compiled\n",
330              progname);
331      exit(EXIT_FAILURE);
332#endif
333
334    } else if (keymatch(arg, "quality", 1)) {
335      /* Quality ratings (quantization table scaling factors). */
336      if (++argn >= argc)       /* advance to next argument */
337        usage();
338      qualityarg = argv[argn];
339
340    } else if (keymatch(arg, "qslots", 2)) {
341      /* Quantization table slot numbers. */
342      if (++argn >= argc)       /* advance to next argument */
343        usage();
344      qslotsarg = argv[argn];
345      /* Must delay setting qslots until after we have processed any
346       * colorspace-determining switches, since jpeg_set_colorspace sets
347       * default quant table numbers.
348       */
349
350    } else if (keymatch(arg, "qtables", 2)) {
351      /* Quantization tables fetched from file. */
352      if (++argn >= argc)       /* advance to next argument */
353        usage();
354      qtablefile = argv[argn];
355      /* We postpone actually reading the file in case -quality comes later. */
356
357    } else if (keymatch(arg, "restart", 1)) {
358      /* Restart interval in MCU rows (or in MCUs with 'b'). */
359      long lval;
360      char ch = 'x';
361
362      if (++argn >= argc)       /* advance to next argument */
363        usage();
364      if (sscanf(argv[argn], "%ld%c", &lval, &ch) < 1)
365        usage();
366      if (lval < 0 || lval > 65535L)
367        usage();
368      if (ch == 'b' || ch == 'B') {
369        cinfo->restart_interval = (unsigned int) lval;
370        cinfo->restart_in_rows = 0; /* else prior '-restart n' overrides me */
371      } else {
372        cinfo->restart_in_rows = (int) lval;
373        /* restart_interval will be computed during startup */
374      }
375
376    } else if (keymatch(arg, "sample", 2)) {
377      /* Set sampling factors. */
378      if (++argn >= argc)       /* advance to next argument */
379        usage();
380      samplearg = argv[argn];
381      /* Must delay setting sample factors until after we have processed any
382       * colorspace-determining switches, since jpeg_set_colorspace sets
383       * default sampling factors.
384       */
385
386    } else if (keymatch(arg, "scale", 4)) {
387      /* Scale the image by a fraction M/N. */
388      if (++argn >= argc)       /* advance to next argument */
389        usage();
390      if (sscanf(argv[argn], "%d/%d",
391                 &cinfo->scale_num, &cinfo->scale_denom) != 2)
392        usage();
393
394    } else if (keymatch(arg, "scans", 4)) {
395      /* Set scan script. */
396#ifdef C_MULTISCAN_FILES_SUPPORTED
397      if (++argn >= argc)       /* advance to next argument */
398        usage();
399      scansarg = argv[argn];
400      /* We must postpone reading the file in case -progressive appears. */
401#else
402      fprintf(stderr, "%s: sorry, multi-scan output was not compiled\n",
403              progname);
404      exit(EXIT_FAILURE);
405#endif
406
407    } else if (keymatch(arg, "smooth", 2)) {
408      /* Set input smoothing factor. */
409      int val;
410
411      if (++argn >= argc)       /* advance to next argument */
412        usage();
413      if (sscanf(argv[argn], "%d", &val) != 1)
414        usage();
415      if (val < 0 || val > 100)
416        usage();
417      cinfo->smoothing_factor = val;
418
419    } else if (keymatch(arg, "targa", 1)) {
420      /* Input file is Targa format. */
421      is_targa = TRUE;
422
423    } else {
424      usage();                  /* bogus switch */
425    }
426  }
427
428  /* Post-switch-scanning cleanup */
429
430  if (for_real) {
431
432    /* Set quantization tables for selected quality. */
433    /* Some or all may be overridden if -qtables is present. */
434    if (qualityarg != NULL)     /* process -quality if it was present */
435      if (! set_quality_ratings(cinfo, qualityarg, force_baseline))
436        usage();
437
438    if (qtablefile != NULL)     /* process -qtables if it was present */
439      if (! read_quant_tables(cinfo, qtablefile, force_baseline))
440        usage();
441
442    if (qslotsarg != NULL)      /* process -qslots if it was present */
443      if (! set_quant_slots(cinfo, qslotsarg))
444        usage();
445
446    if (samplearg != NULL)      /* process -sample if it was present */
447      if (! set_sample_factors(cinfo, samplearg))
448        usage();
449
450#ifdef C_PROGRESSIVE_SUPPORTED
451    if (simple_progressive)     /* process -progressive; -scans can override */
452      jpeg_simple_progression(cinfo);
453#endif
454
455#ifdef C_MULTISCAN_FILES_SUPPORTED
456    if (scansarg != NULL)       /* process -scans if it was present */
457      if (! read_scan_script(cinfo, scansarg))
458        usage();
459#endif
460  }
461
462  return argn;                  /* return index of next arg (file name) */
463}
464
465
466/*
467 * The main program.
468 */
469
470int
471main (int argc, char **argv)
472{
473  struct jpeg_compress_struct cinfo;
474  struct jpeg_error_mgr jerr;
475#ifdef PROGRESS_REPORT
476  struct cdjpeg_progress_mgr progress;
477#endif
478  int file_index;
479  cjpeg_source_ptr src_mgr;
480  FILE * input_file;
481  FILE * output_file;
482  JDIMENSION num_scanlines;
483
484  /* On Mac, fetch a command line. */
485#ifdef USE_CCOMMAND
486  argc = ccommand(&argv);
487#endif
488
489  progname = argv[0];
490  if (progname == NULL || progname[0] == 0)
491    progname = "cjpeg";         /* in case C library doesn't provide it */
492
493  /* Initialize the JPEG compression object with default error handling. */
494  cinfo.err = jpeg_std_error(&jerr);
495  jpeg_create_compress(&cinfo);
496  /* Add some application-specific error messages (from cderror.h) */
497  jerr.addon_message_table = cdjpeg_message_table;
498  jerr.first_addon_message = JMSG_FIRSTADDONCODE;
499  jerr.last_addon_message = JMSG_LASTADDONCODE;
500
501  /* Now safe to enable signal catcher. */
502#ifdef NEED_SIGNAL_CATCHER
503  enable_signal_catcher((j_common_ptr) &cinfo);
504#endif
505
506  /* Initialize JPEG parameters.
507   * Much of this may be overridden later.
508   * In particular, we don't yet know the input file's color space,
509   * but we need to provide some value for jpeg_set_defaults() to work.
510   */
511
512  cinfo.in_color_space = JCS_RGB; /* arbitrary guess */
513  jpeg_set_defaults(&cinfo);
514
515  /* Scan command line to find file names.
516   * It is convenient to use just one switch-parsing routine, but the switch
517   * values read here are ignored; we will rescan the switches after opening
518   * the input file.
519   */
520
521  file_index = parse_switches(&cinfo, argc, argv, 0, FALSE);
522
523#ifdef TWO_FILE_COMMANDLINE
524  /* Must have either -outfile switch or explicit output file name */
525  if (outfilename == NULL) {
526    if (file_index != argc-2) {
527      fprintf(stderr, "%s: must name one input and one output file\n",
528              progname);
529      usage();
530    }
531    outfilename = argv[file_index+1];
532  } else {
533    if (file_index != argc-1) {
534      fprintf(stderr, "%s: must name one input and one output file\n",
535              progname);
536      usage();
537    }
538  }
539#else
540  /* Unix style: expect zero or one file name */
541  if (file_index < argc-1) {
542    fprintf(stderr, "%s: only one input file\n", progname);
543    usage();
544  }
545#endif /* TWO_FILE_COMMANDLINE */
546
547  /* Open the input file. */
548  if (file_index < argc) {
549    if ((input_file = fopen(argv[file_index], READ_BINARY)) == NULL) {
550      fprintf(stderr, "%s: can't open %s\n", progname, argv[file_index]);
551      exit(EXIT_FAILURE);
552    }
553  } else {
554    /* default input file is stdin */
555    input_file = read_stdin();
556  }
557
558  /* Open the output file. */
559  if (outfilename != NULL) {
560    if ((output_file = fopen(outfilename, WRITE_BINARY)) == NULL) {
561      fprintf(stderr, "%s: can't open %s\n", progname, outfilename);
562      exit(EXIT_FAILURE);
563    }
564  } else {
565    /* default output file is stdout */
566    output_file = write_stdout();
567  }
568
569#ifdef PROGRESS_REPORT
570  start_progress_monitor((j_common_ptr) &cinfo, &progress);
571#endif
572
573  /* Figure out the input file format, and set up to read it. */
574  src_mgr = select_file_type(&cinfo, input_file);
575  src_mgr->input_file = input_file;
576
577  /* Read the input file header to obtain file size & colorspace. */
578  (*src_mgr->start_input) (&cinfo, src_mgr);
579
580  /* Now that we know input colorspace, fix colorspace-dependent defaults */
581  jpeg_default_colorspace(&cinfo);
582
583  /* Adjust default compression parameters by re-parsing the options */
584  file_index = parse_switches(&cinfo, argc, argv, 0, TRUE);
585
586  /* Specify data destination for compression */
587  jpeg_stdio_dest(&cinfo, output_file);
588
589  /* Start compressor */
590  jpeg_start_compress(&cinfo, TRUE);
591
592  /* Process data */
593  while (cinfo.next_scanline < cinfo.image_height) {
594    num_scanlines = (*src_mgr->get_pixel_rows) (&cinfo, src_mgr);
595    (void) jpeg_write_scanlines(&cinfo, src_mgr->buffer, num_scanlines);
596  }
597
598  /* Finish compression and release memory */
599  (*src_mgr->finish_input) (&cinfo, src_mgr);
600  jpeg_finish_compress(&cinfo);
601  jpeg_destroy_compress(&cinfo);
602
603  /* Close files, if we opened them */
604  if (input_file != stdin)
605    fclose(input_file);
606  if (output_file != stdout)
607    fclose(output_file);
608
609#ifdef PROGRESS_REPORT
610  end_progress_monitor((j_common_ptr) &cinfo);
611#endif
612
613  /* All done. */
614  exit(jerr.num_warnings ? EXIT_WARNING : EXIT_SUCCESS);
615  return 0;                     /* suppress no-return-value warnings */
616}
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