tools/rgb2ycbcr.c

   1 /* $Id: rgb2ycbcr.c,v 1.9.2.2 2010-06-08 18:50:44 bfriesen Exp $ */
   2
   3 /*
   4  * Copyright (c) 1991-1997 Sam Leffler
   5  * Copyright (c) 1991-1997 Silicon Graphics, Inc.
   6  *
   7  * Permission to use, copy, modify, distribute, and sell this software and
   8  * its documentation for any purpose is hereby granted without fee, provided
   9  * that (i) the above copyright notices and this permission notice appear in
  10  * all copies of the software and related documentation, and (ii) the names of
  11  * Sam Leffler and Silicon Graphics may not be used in any advertising or
  12  * publicity relating to the software without the specific, prior written
  13  * permission of Sam Leffler and Silicon Graphics.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
  16  * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
  17  * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
  18  *
  19  * IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
  20  * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
  21  * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
  22  * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
  23  * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
  24  * OF THIS SOFTWARE.
  25  */
  26
  27 #include "tif_config.h"
  28
  29 #include <stdio.h>
  30 #include <string.h>
  31 #include <stdlib.h>
  32
  33 #ifdef HAVE_UNISTD_H
  34 # include <unistd.h>
  35 #endif
  36
  37 #include "tiffiop.h"
  38 #include "tiffio.h"
  39
  40 #define streq(a,b)      (strcmp(a,b) == 0)
  41 #define CopyField(tag, v) \
  42     if (TIFFGetField(in, tag, &v)) TIFFSetField(out, tag, v)
  43
  44 #ifndef howmany
  45 #define howmany(x, y)   (((x)+((y)-1))/(y))
  46 #endif
  47 #define roundup(x, y)   (howmany(x,y)*((uint32)(y)))
  48
  49 #define LumaRed         ycbcrCoeffs[0]
  50 #define LumaGreen       ycbcrCoeffs[1]
  51 #define LumaBlue        ycbcrCoeffs[2]
  52
  53 uint16  compression = COMPRESSION_PACKBITS;
  54 uint32  rowsperstrip = (uint32) -1;
  55
  56 uint16  horizSubSampling = 2;           /* YCbCr horizontal subsampling */
  57 uint16  vertSubSampling = 2;            /* YCbCr vertical subsampling */
  58 float   ycbcrCoeffs[3] = { .299F, .587F, .114F };
  59 /* default coding range is CCIR Rec 601-1 with no headroom/footroom */
  60 float   refBlackWhite[6] = { 0.F, 255.F, 128.F, 255.F, 128.F, 255.F };
  61
  62 static  int tiffcvt(TIFF* in, TIFF* out);
  63 static  void usage(int code);
  64 static  void setupLumaTables(void);
  65
  66 int
  67 main(int argc, char* argv[])
  68 {
  69         TIFF *in, *out;
  70         int c;
  71         extern int optind;
  72         extern char *optarg;
  73
  74         while ((c = getopt(argc, argv, "c:h:r:v:z")) != -1)
  75                 switch (c) {
  76                 case 'c':
  77                         if (streq(optarg, "none"))
  78                             compression = COMPRESSION_NONE;
  79                         else if (streq(optarg, "packbits"))
  80                             compression = COMPRESSION_PACKBITS;
  81                         else if (streq(optarg, "lzw"))
  82                             compression = COMPRESSION_LZW;
  83                         else if (streq(optarg, "jpeg"))
  84                             compression = COMPRESSION_JPEG;
  85                         else if (streq(optarg, "zip"))
  86                             compression = COMPRESSION_ADOBE_DEFLATE;
  87                         else
  88                             usage(-1);
  89                         break;
  90                 case 'h':
  91                         horizSubSampling = atoi(optarg);
  92                         break;
  93                 case 'v':
  94                         vertSubSampling = atoi(optarg);
  95                         break;
  96                 case 'r':
  97                         rowsperstrip = atoi(optarg);
  98                         break;
  99                 case 'z':       /* CCIR Rec 601-1 w/ headroom/footroom */
 100                         refBlackWhite[0] = 16.;
 101                         refBlackWhite[1] = 235.;
 102                         refBlackWhite[2] = 128.;
 103                         refBlackWhite[3] = 240.;
 104                         refBlackWhite[4] = 128.;
 105                         refBlackWhite[5] = 240.;
 106                         break;
 107                 case '?':
 108                         usage(0);
 109                         /*NOTREACHED*/
 110                 }
 111         if (argc - optind < 2)
 112                 usage(-1);
 113         out = TIFFOpen(argv[argc-1], "w");
 114         if (out == NULL)
 115                 return (-2);
 116         setupLumaTables();
 117         for (; optind < argc-1; optind++) {
 118                 in = TIFFOpen(argv[optind], "r");
 119                 if (in != NULL) {
 120                         do {
 121                                 if (!tiffcvt(in, out) ||
 122                                     !TIFFWriteDirectory(out)) {
 123                                         (void) TIFFClose(out);
 124                                         return (1);
 125                                 }
 126                         } while (TIFFReadDirectory(in));
 127                         (void) TIFFClose(in);
 128                 }
 129         }
 130         (void) TIFFClose(out);
 131         return (0);
 132 }
 133
 134 float   *lumaRed;
 135 float   *lumaGreen;
 136 float   *lumaBlue;
 137 float   D1, D2;
 138 int     Yzero;
 139
 140 static float*
 141 setupLuma(float c)
 142 {
 143         float *v = (float *)_TIFFmalloc(256 * sizeof (float));
 144         int i;
 145         for (i = 0; i < 256; i++)
 146                 v[i] = c * i;
 147         return (v);
 148 }
 149
 150 static unsigned
 151 V2Code(float f, float RB, float RW, int CR)
 152 {
 153         unsigned int c = (unsigned int)((((f)*(RW-RB)/CR)+RB)+.5);
 154         return (c > 255 ? 255 : c);
 155 }
 156
 157 static void
 158 setupLumaTables(void)
 159 {
 160         lumaRed = setupLuma(LumaRed);
 161         lumaGreen = setupLuma(LumaGreen);
 162         lumaBlue = setupLuma(LumaBlue);
 163         D1 = 1.F/(2.F - 2.F*LumaBlue);
 164         D2 = 1.F/(2.F - 2.F*LumaRed);
 165         Yzero = V2Code(0, refBlackWhite[0], refBlackWhite[1], 255);
 166 }
 167
 168 static void
 169 cvtClump(unsigned char* op, uint32* raster, uint32 ch, uint32 cw, uint32 w)
 170 {
 171         float Y, Cb = 0, Cr = 0;
 172         uint32 j, k;
 173         /*
 174          * Convert ch-by-cw block of RGB
 175          * to YCbCr and sample accordingly.
 176          */
 177         for (k = 0; k < ch; k++) {
 178                 for (j = 0; j < cw; j++) {
 179                         uint32 RGB = (raster - k*w)[j];
 180                         Y = lumaRed[TIFFGetR(RGB)] +
 181                             lumaGreen[TIFFGetG(RGB)] +
 182                             lumaBlue[TIFFGetB(RGB)];
 183                         /* accumulate chrominance */
 184                         Cb += (TIFFGetB(RGB) - Y) * D1;
 185                         Cr += (TIFFGetR(RGB) - Y) * D2;
 186                         /* emit luminence */
 187                         *op++ = V2Code(Y,
 188                             refBlackWhite[0], refBlackWhite[1], 255);
 189                 }
 190                 for (; j < horizSubSampling; j++)
 191                         *op++ = Yzero;
 192         }
 193         for (; k < vertSubSampling; k++) {
 194                 for (j = 0; j < horizSubSampling; j++)
 195                         *op++ = Yzero;
 196         }
 197         /* emit sampled chrominance values */
 198         *op++ = V2Code(Cb / (ch*cw), refBlackWhite[2], refBlackWhite[3], 127);
 199         *op++ = V2Code(Cr / (ch*cw), refBlackWhite[4], refBlackWhite[5], 127);
 200 }
 201 #undef LumaRed
 202 #undef LumaGreen
 203 #undef LumaBlue
 204 #undef V2Code
 205
 206 /*
 207  * Convert a strip of RGB data to YCbCr and
 208  * sample to generate the output data.
 209  */
 210 static void
 211 cvtStrip(unsigned char* op, uint32* raster, uint32 nrows, uint32 width)
 212 {
 213         uint32 x;
 214         int clumpSize = vertSubSampling * horizSubSampling + 2;
 215         uint32 *tp;
 216
 217         for (; nrows >= vertSubSampling; nrows -= vertSubSampling) {
 218                 tp = raster;
 219                 for (x = width; x >= horizSubSampling; x -= horizSubSampling) {
 220                         cvtClump(op, tp,
 221                             vertSubSampling, horizSubSampling, width);
 222                         op += clumpSize;
 223                         tp += horizSubSampling;
 224                 }
 225                 if (x > 0) {
 226                         cvtClump(op, tp, vertSubSampling, x, width);
 227                         op += clumpSize;
 228                 }
 229                 raster -= vertSubSampling*width;
 230         }
 231         if (nrows > 0) {
 232                 tp = raster;
 233                 for (x = width; x >= horizSubSampling; x -= horizSubSampling) {
 234                         cvtClump(op, tp, nrows, horizSubSampling, width);
 235                         op += clumpSize;
 236                         tp += horizSubSampling;
 237                 }
 238                 if (x > 0)
 239                         cvtClump(op, tp, nrows, x, width);
 240         }
 241 }
 242
 243 static int
 244 cvtRaster(TIFF* tif, uint32* raster, uint32 width, uint32 height)
 245 {
 246         uint32 y;
 247         tstrip_t strip = 0;
 248         tsize_t cc, acc;
 249         unsigned char* buf;
 250         uint32 rwidth = roundup(width, horizSubSampling);
 251         uint32 rheight = roundup(height, vertSubSampling);
 252         uint32 nrows = (rowsperstrip > rheight ? rheight : rowsperstrip);
 253         uint32 rnrows = roundup(nrows,vertSubSampling);
 254
 255         cc = rnrows*rwidth +
 256             2*((rnrows*rwidth) / (horizSubSampling*vertSubSampling));
 257         buf = (unsigned char*)_TIFFmalloc(cc);
 258         for (y = height; (int32) y > 0; y -= nrows) {
 259                 uint32 nr = (y > nrows ? nrows : y);
 260                 cvtStrip(buf, raster + (y-1)*width, nr, width);
 261                 nr = roundup(nr, vertSubSampling);
 262                 acc = nr*rwidth +
 263                         2*((nr*rwidth)/(horizSubSampling*vertSubSampling));
 264                 if (!TIFFWriteEncodedStrip(tif, strip++, buf, acc)) {
 265                         _TIFFfree(buf);
 266                         return (0);
 267                 }
 268         }
 269         _TIFFfree(buf);
 270         return (1);
 271 }
 272
 273 static int
 274 tiffcvt(TIFF* in, TIFF* out)
 275 {
 276         uint32 width, height;           /* image width & height */
 277         uint32* raster;                 /* retrieve RGBA image */
 278         uint16 shortv;
 279         float floatv;
 280         char *stringv;
 281         uint32 longv;
 282
 283         size_t pixel_count;
 284         TIFFGetField(in, TIFFTAG_IMAGEWIDTH, &width);
 285         TIFFGetField(in, TIFFTAG_IMAGELENGTH, &height);
 286         pixel_count = width * height;
 287
 288         /* XXX: Check the integer overflow. */
 289         if (!width || !height || pixel_count / width != height) {
 290                 TIFFError(TIFFFileName(in),
 291                           "Malformed input file; "
 292                           "can't allocate buffer for raster of %lux%lu size",
 293                           (unsigned long)width, (unsigned long)height);
 294                 return 0;
 295         }
 296
 297         raster = (uint32*)_TIFFCheckMalloc(in, pixel_count, sizeof(uint32),
 298                                            "raster buffer");
 299         if (raster == 0) {
 300                 TIFFError(TIFFFileName(in),
 301                           "Requested buffer size is %lu elements %lu each",
 302                           (unsigned long)pixel_count,
 303                           (unsigned long)sizeof(uint32));
 304                 return (0);
 305         }
 306
 307         if (!TIFFReadRGBAImage(in, width, height, raster, 0)) {
 308                 _TIFFfree(raster);
 309                 return (0);
 310         }
 311
 312         CopyField(TIFFTAG_SUBFILETYPE, longv);
 313         TIFFSetField(out, TIFFTAG_IMAGEWIDTH, width);
 314         TIFFSetField(out, TIFFTAG_IMAGELENGTH, height);
 315         TIFFSetField(out, TIFFTAG_BITSPERSAMPLE, 8);
 316         TIFFSetField(out, TIFFTAG_COMPRESSION, compression);
 317         TIFFSetField(out, TIFFTAG_PHOTOMETRIC, PHOTOMETRIC_YCBCR);
 318         if (compression == COMPRESSION_JPEG)
 319                 TIFFSetField(out, TIFFTAG_JPEGCOLORMODE, JPEGCOLORMODE_RAW);
 320         CopyField(TIFFTAG_FILLORDER, shortv);
 321         TIFFSetField(out, TIFFTAG_ORIENTATION, ORIENTATION_TOPLEFT);
 322         TIFFSetField(out, TIFFTAG_SAMPLESPERPIXEL, 3);
 323         CopyField(TIFFTAG_XRESOLUTION, floatv);
 324         CopyField(TIFFTAG_YRESOLUTION, floatv);
 325         CopyField(TIFFTAG_RESOLUTIONUNIT, shortv);
 326         TIFFSetField(out, TIFFTAG_PLANARCONFIG, PLANARCONFIG_CONTIG);
 327         { char buf[2048];
 328           char *cp = strrchr(TIFFFileName(in), '/');
 329           sprintf(buf, "YCbCr conversion of %s", cp ? cp+1 : TIFFFileName(in));
 330           TIFFSetField(out, TIFFTAG_IMAGEDESCRIPTION, buf);
 331         }
 332         TIFFSetField(out, TIFFTAG_SOFTWARE, TIFFGetVersion());
 333         CopyField(TIFFTAG_DOCUMENTNAME, stringv);
 334
 335         TIFFSetField(out, TIFFTAG_REFERENCEBLACKWHITE, refBlackWhite);
 336         TIFFSetField(out, TIFFTAG_YCBCRSUBSAMPLING,
 337             horizSubSampling, vertSubSampling);
 338         TIFFSetField(out, TIFFTAG_YCBCRPOSITIONING, YCBCRPOSITION_CENTERED);
 339         TIFFSetField(out, TIFFTAG_YCBCRCOEFFICIENTS, ycbcrCoeffs);
 340         rowsperstrip = TIFFDefaultStripSize(out, rowsperstrip);
 341         TIFFSetField(out, TIFFTAG_ROWSPERSTRIP, rowsperstrip);
 342
 343         return (cvtRaster(out, raster, width, height));
 344 }
 345
 346 char* stuff[] = {
 347     "usage: rgb2ycbcr [-c comp] [-r rows] [-h N] [-v N] input... output\n",
 348     "where comp is one of the following compression algorithms:\n",
 349     " jpeg\t\tJPEG encoding\n",
 350     " lzw\t\tLempel-Ziv & Welch encoding\n",
 351     " zip\t\tdeflate encoding\n",
 352     " packbits\tPackBits encoding (default)\n",
 353     " none\t\tno compression\n",
 354     "and the other options are:\n",
 355     " -r\trows/strip\n",
 356     " -h\thorizontal sampling factor (1,2,4)\n",
 357     " -v\tvertical sampling factor (1,2,4)\n",
 358     NULL
 359 };
 360
 361 static void
 362 usage(int code)
 363 {
 364         char buf[BUFSIZ];
 365         int i;
 366
 367         setbuf(stderr, buf);
 368
 369  fprintf(stderr, "%s\n\n", TIFFGetVersion());
 370         for (i = 0; stuff[i] != NULL; i++)
 371                 fprintf(stderr, "%s\n", stuff[i]);
 372         exit(code);
 373 }
 374
 375 /* vim: set ts=8 sts=8 sw=8 noet: */
 376 /*
 377  * Local Variables:
 378  * mode: c
 379  * c-basic-offset: 8
 380  * fill-column: 78
 381  * End:
 382  */