350 lines
9.7 KiB
C
350 lines
9.7 KiB
C
/* $Id: rgb2ycbcr.c,v 1.8 2004-07-24 19:05:13 dron Exp $ */
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/*
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* Copyright (c) 1991-1997 Sam Leffler
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* Copyright (c) 1991-1997 Silicon Graphics, Inc.
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*
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* Permission to use, copy, modify, distribute, and sell this software and
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* its documentation for any purpose is hereby granted without fee, provided
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* that (i) the above copyright notices and this permission notice appear in
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* all copies of the software and related documentation, and (ii) the names of
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* Sam Leffler and Silicon Graphics may not be used in any advertising or
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* publicity relating to the software without the specific, prior written
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* permission of Sam Leffler and Silicon Graphics.
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*
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* THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
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* WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
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*
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* IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
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* ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
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* OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
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* WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
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* LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
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* OF THIS SOFTWARE.
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*/
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include "tiffio.h"
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#define streq(a,b) (strcmp(a,b) == 0)
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#define CopyField(tag, v) \
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if (TIFFGetField(in, tag, &v)) TIFFSetField(out, tag, v)
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#ifndef howmany
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#define howmany(x, y) (((x)+((y)-1))/(y))
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#endif
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#define roundup(x, y) (howmany(x,y)*((uint32)(y)))
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#define LumaRed ycbcrCoeffs[0]
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#define LumaGreen ycbcrCoeffs[1]
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#define LumaBlue ycbcrCoeffs[2]
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uint16 compression = COMPRESSION_PACKBITS;
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uint32 rowsperstrip = (uint32) -1;
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uint16 horizSubSampling = 2; /* YCbCr horizontal subsampling */
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uint16 vertSubSampling = 2; /* YCbCr vertical subsampling */
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float ycbcrCoeffs[3] = { .299F, .587F, .114F };
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/* default coding range is CCIR Rec 601-1 with no headroom/footroom */
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float refBlackWhite[6] = { 0.F, 255.F, 128.F, 255.F, 128.F, 255.F };
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static int tiffcvt(TIFF* in, TIFF* out);
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static void usage(int code);
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static void setupLumaTables(void);
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int
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main(int argc, char* argv[])
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{
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TIFF *in, *out;
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int c;
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extern int optind;
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extern char *optarg;
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while ((c = getopt(argc, argv, "c:h:r:v:z")) != -1)
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switch (c) {
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case 'c':
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if (streq(optarg, "none"))
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compression = COMPRESSION_NONE;
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else if (streq(optarg, "packbits"))
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compression = COMPRESSION_PACKBITS;
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else if (streq(optarg, "lzw"))
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compression = COMPRESSION_LZW;
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else if (streq(optarg, "jpeg"))
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compression = COMPRESSION_JPEG;
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else if (streq(optarg, "zip"))
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compression = COMPRESSION_ADOBE_DEFLATE;
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else
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usage(-1);
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break;
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case 'h':
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horizSubSampling = atoi(optarg);
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break;
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case 'v':
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vertSubSampling = atoi(optarg);
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break;
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case 'r':
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rowsperstrip = atoi(optarg);
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break;
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case 'z': /* CCIR Rec 601-1 w/ headroom/footroom */
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refBlackWhite[0] = 16.;
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refBlackWhite[1] = 235.;
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refBlackWhite[2] = 128.;
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refBlackWhite[3] = 240.;
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refBlackWhite[4] = 128.;
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refBlackWhite[5] = 240.;
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break;
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case '?':
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usage(0);
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/*NOTREACHED*/
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}
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if (argc - optind < 2)
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usage(-1);
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out = TIFFOpen(argv[argc-1], "w");
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if (out == NULL)
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return (-2);
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setupLumaTables();
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for (; optind < argc-1; optind++) {
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in = TIFFOpen(argv[optind], "r");
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if (in != NULL) {
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do {
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if (!tiffcvt(in, out) ||
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!TIFFWriteDirectory(out)) {
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(void) TIFFClose(out);
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return (1);
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}
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} while (TIFFReadDirectory(in));
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(void) TIFFClose(in);
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}
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}
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(void) TIFFClose(out);
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return (0);
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}
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float *lumaRed;
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float *lumaGreen;
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float *lumaBlue;
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float D1, D2;
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int Yzero;
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static float*
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setupLuma(float c)
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{
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float *v = (float *)_TIFFmalloc(256 * sizeof (float));
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int i;
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for (i = 0; i < 256; i++)
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v[i] = c * i;
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return (v);
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}
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static unsigned
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V2Code(float f, float RB, float RW, int CR)
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{
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unsigned int c = (unsigned int)((((f)*(RW-RB)/CR)+RB)+.5);
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return (c > 255 ? 255 : c);
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}
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static void
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setupLumaTables(void)
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{
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lumaRed = setupLuma(LumaRed);
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lumaGreen = setupLuma(LumaGreen);
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lumaBlue = setupLuma(LumaBlue);
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D1 = 1.F/(2.F - 2.F*LumaBlue);
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D2 = 1.F/(2.F - 2.F*LumaRed);
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Yzero = V2Code(0, refBlackWhite[0], refBlackWhite[1], 255);
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}
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static void
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cvtClump(unsigned char* op, uint32* raster, uint32 ch, uint32 cw, uint32 w)
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{
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float Y, Cb = 0, Cr = 0;
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uint32 j, k;
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/*
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* Convert ch-by-cw block of RGB
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* to YCbCr and sample accordingly.
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*/
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for (k = 0; k < ch; k++) {
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for (j = 0; j < cw; j++) {
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uint32 RGB = (raster - k*w)[j];
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Y = lumaRed[TIFFGetR(RGB)] +
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lumaGreen[TIFFGetG(RGB)] +
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lumaBlue[TIFFGetB(RGB)];
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/* accumulate chrominance */
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Cb += (TIFFGetB(RGB) - Y) * D1;
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Cr += (TIFFGetR(RGB) - Y) * D2;
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/* emit luminence */
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*op++ = V2Code(Y,
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refBlackWhite[0], refBlackWhite[1], 255);
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}
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for (; j < horizSubSampling; j++)
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*op++ = Yzero;
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}
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for (; k < vertSubSampling; k++) {
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for (j = 0; j < horizSubSampling; j++)
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*op++ = Yzero;
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}
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/* emit sampled chrominance values */
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*op++ = V2Code(Cb / (ch*cw), refBlackWhite[2], refBlackWhite[3], 127);
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*op++ = V2Code(Cr / (ch*cw), refBlackWhite[4], refBlackWhite[5], 127);
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}
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#undef LumaRed
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#undef LumaGreen
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#undef LumaBlue
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#undef V2Code
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/*
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* Convert a strip of RGB data to YCbCr and
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* sample to generate the output data.
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*/
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static void
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cvtStrip(unsigned char* op, uint32* raster, uint32 nrows, uint32 width)
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{
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uint32 x;
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int clumpSize = vertSubSampling * horizSubSampling + 2;
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uint32 *tp;
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for (; nrows >= vertSubSampling; nrows -= vertSubSampling) {
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tp = raster;
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for (x = width; x >= horizSubSampling; x -= horizSubSampling) {
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cvtClump(op, tp,
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vertSubSampling, horizSubSampling, width);
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op += clumpSize;
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tp += horizSubSampling;
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}
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if (x > 0) {
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cvtClump(op, tp, vertSubSampling, x, width);
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op += clumpSize;
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}
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raster -= vertSubSampling*width;
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}
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if (nrows > 0) {
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tp = raster;
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for (x = width; x >= horizSubSampling; x -= horizSubSampling) {
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cvtClump(op, tp, nrows, horizSubSampling, width);
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op += clumpSize;
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tp += horizSubSampling;
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}
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if (x > 0)
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cvtClump(op, tp, nrows, x, width);
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}
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}
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static int
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cvtRaster(TIFF* tif, uint32* raster, uint32 width, uint32 height)
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{
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uint32 y;
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tstrip_t strip = 0;
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tsize_t cc, acc;
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unsigned char* buf;
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uint32 rwidth = roundup(width, horizSubSampling);
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uint32 rheight = roundup(height, vertSubSampling);
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uint32 nrows = (rowsperstrip > rheight ? rheight : rowsperstrip);
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uint32 rnrows = roundup(nrows,vertSubSampling);
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cc = rnrows*rwidth +
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2*((rnrows*rwidth) / (horizSubSampling*vertSubSampling));
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buf = (unsigned char*)_TIFFmalloc(cc);
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for (y = height; (int32) y > 0; y -= nrows) {
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uint32 nr = (y > nrows ? nrows : y);
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cvtStrip(buf, raster + (y-1)*width, nr, width);
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nr = roundup(nr, vertSubSampling);
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acc = nr*rwidth +
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2*((nr*rwidth)/(horizSubSampling*vertSubSampling));
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if (!TIFFWriteEncodedStrip(tif, strip++, buf, acc)) {
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_TIFFfree(buf);
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return (0);
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}
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}
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_TIFFfree(buf);
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return (1);
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}
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static int
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tiffcvt(TIFF* in, TIFF* out)
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{
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uint32 width, height; /* image width & height */
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uint32* raster; /* retrieve RGBA image */
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uint16 shortv;
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float floatv;
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char *stringv;
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uint32 longv;
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TIFFGetField(in, TIFFTAG_IMAGEWIDTH, &width);
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TIFFGetField(in, TIFFTAG_IMAGELENGTH, &height);
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raster = (uint32*)_TIFFmalloc(width * height * sizeof (uint32));
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if (raster == 0) {
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TIFFError(TIFFFileName(in), "No space for raster buffer");
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return (0);
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}
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if (!TIFFReadRGBAImage(in, width, height, raster, 0)) {
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_TIFFfree(raster);
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return (0);
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}
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CopyField(TIFFTAG_SUBFILETYPE, longv);
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TIFFSetField(out, TIFFTAG_IMAGEWIDTH, width);
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TIFFSetField(out, TIFFTAG_IMAGELENGTH, height);
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TIFFSetField(out, TIFFTAG_BITSPERSAMPLE, 8);
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TIFFSetField(out, TIFFTAG_COMPRESSION, compression);
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TIFFSetField(out, TIFFTAG_PHOTOMETRIC, PHOTOMETRIC_YCBCR);
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if (compression == COMPRESSION_JPEG)
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TIFFSetField(out, TIFFTAG_JPEGCOLORMODE, JPEGCOLORMODE_RAW);
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CopyField(TIFFTAG_FILLORDER, shortv);
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TIFFSetField(out, TIFFTAG_ORIENTATION, ORIENTATION_TOPLEFT);
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TIFFSetField(out, TIFFTAG_SAMPLESPERPIXEL, 3);
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CopyField(TIFFTAG_XRESOLUTION, floatv);
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CopyField(TIFFTAG_YRESOLUTION, floatv);
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CopyField(TIFFTAG_RESOLUTIONUNIT, shortv);
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TIFFSetField(out, TIFFTAG_PLANARCONFIG, PLANARCONFIG_CONTIG);
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{ char buf[2048];
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char *cp = strrchr(TIFFFileName(in), '/');
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sprintf(buf, "YCbCr conversion of %s", cp ? cp+1 : TIFFFileName(in));
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TIFFSetField(out, TIFFTAG_IMAGEDESCRIPTION, buf);
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}
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TIFFSetField(out, TIFFTAG_SOFTWARE, TIFFGetVersion());
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CopyField(TIFFTAG_DOCUMENTNAME, stringv);
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TIFFSetField(out, TIFFTAG_REFERENCEBLACKWHITE, refBlackWhite);
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TIFFSetField(out, TIFFTAG_YCBCRSUBSAMPLING,
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horizSubSampling, vertSubSampling);
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TIFFSetField(out, TIFFTAG_YCBCRPOSITIONING, YCBCRPOSITION_CENTERED);
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TIFFSetField(out, TIFFTAG_YCBCRCOEFFICIENTS, ycbcrCoeffs);
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rowsperstrip = TIFFDefaultStripSize(out, rowsperstrip);
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TIFFSetField(out, TIFFTAG_ROWSPERSTRIP, rowsperstrip);
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return (cvtRaster(out, raster, width, height));
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}
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char* stuff[] = {
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"usage: rgb2ycbcr [-c comp] [-r rows] [-h N] [-v N] input... output\n",
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"where comp is one of the following compression algorithms:\n",
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" jpeg\t\tJPEG encoding\n",
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" lzw\t\tLempel-Ziv & Welch encoding\n",
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" zip\t\tdeflate encoding\n",
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" packbits\tPackBits encoding (default)\n",
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" none\t\tno compression\n",
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"and the other options are:\n",
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" -r\trows/strip\n",
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" -h\thorizontal sampling factor (1,2,4)\n",
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" -v\tvertical sampling factor (1,2,4)\n",
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NULL
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};
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static void
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usage(int code)
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{
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char buf[BUFSIZ];
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int i;
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setbuf(stderr, buf);
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fprintf(stderr, "%s\n\n", TIFFGetVersion());
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for (i = 0; stuff[i] != NULL; i++)
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fprintf(stderr, "%s\n", stuff[i]);
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exit(code);
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}
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