dlls/qcap/yuv.c

   1 /* DirectShow capture services (QCAP.DLL)
   2  *
   3  * Copyright 2005 Maarten Lankhorst
   4  *
   5  * This file contains the part of the vfw capture interface that
   6  * does the actual Video4Linux(1/2) stuff required for capturing
   7  * and setting/getting media format..
   8  *
   9  * This library is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU Lesser General Public
  11  * License as published by the Free Software Foundation; either
  12  * version 2.1 of the License, or (at your option) any later version.
  13  *
  14  * This library is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public
  20  * License along with this library; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  22  */
  23
  24 #include <stdarg.h>
  25
  26 #include "windef.h"
  27 #include "wingdi.h"
  28 #include "objbase.h"
  29 #include "strmif.h"
  30 #include "qcap_main.h"
  31 #include "wine/debug.h"
  32
  33 WINE_DEFAULT_DEBUG_CHANNEL(qcap);
  34
  35 static int yuv_xy[256]; /* Gray value */
  36 static int yuv_gu[256]; /* Green U */
  37 static int yuv_bu[256]; /* Blue  U */
  38 static int yuv_rv[256]; /* Red   V */
  39 static int yuv_gv[256]; /* Green V */
  40 static int initialised = 0;
  41
  42 static inline int ValidRange(int in) {
  43    if (in > 255) in = 255;
  44    if (in < 0) in = 0;
  45    return in;
  46 }
  47
  48 typedef struct RGB {
  49 #if 0 /* For some reason I have to revert R and B, not sure why */
  50   unsigned char r, g, b;
  51 #else
  52   unsigned char b, g, r;
  53 #endif
  54 } RGB;
  55
  56 static inline void YUV2RGB(const unsigned char y_, const unsigned char cb, const unsigned char cr, RGB* retval) {
  57    retval->r = ValidRange(yuv_xy[y_] + yuv_rv[cr]);
  58    retval->g = ValidRange(yuv_xy[y_] + yuv_gu[cb] + yuv_gv[cr]);
  59    retval->b = ValidRange(yuv_xy[y_] + yuv_bu[cb]);
  60 }
  61
  62 void YUV_Init(void) {
  63    float y, u, v;
  64    int y_, cb, cr;
  65
  66    if (initialised++) return;
  67
  68    for (y_ = 0; y_ <= 255; y_++)
  69    {
  70       y = ((float) 255 / 219) * (y_ - 16);
  71       yuv_xy[y_] = y;
  72    }
  73
  74    for (cb = 0; cb <= 255; cb++)
  75    {
  76       u = ((float) 255 / 224) * (cb - 128);
  77       yuv_gu[cb] = -0.344 * u;
  78       yuv_bu[cb] =  1.772 * u;
  79    }
  80
  81    for (cr = 0; cr <= 255; cr++)
  82    {
  83       v = ((float) 255 / 224) * (cr - 128);
  84       yuv_rv[cr] =  1.402 * v;
  85       yuv_gv[cr] = -0.714 * v;
  86    }
  87    TRACE("Filled hash table\n");
  88 }
  89
  90 static void Parse_YUYV(unsigned char *destbuffer, const unsigned char *input, int width, int height)
  91 {
  92    const unsigned char *pY, *pCb, *pCr;
  93    int togo = width * height / 2;
  94    pY = input;
  95    pCb = input+1;
  96    pCr = input+3;
  97    while (--togo) {
  98       YUV2RGB(*pY, *pCb, *pCr, (RGB *)destbuffer);
  99       pY += 2; destbuffer += 3;
 100       YUV2RGB(*pY, *pCb, *pCr, (RGB *)destbuffer);
 101       pY += 2; pCb += 4; pCr += 4; destbuffer += 3;
 102    }
 103 }
 104
 105 static void Parse_UYVY(unsigned char *destbuffer, const unsigned char *input, int width, int height)
 106 {
 107    const unsigned char *pY, *pCb, *pCr;
 108    int togo = width * height / 2;
 109    pY = input+1;
 110    pCb = input;
 111    pCr = input+2;
 112    while (--togo) {
 113       YUV2RGB(*pY, *pCb, *pCr, (RGB *)destbuffer);
 114       pY += 2; destbuffer += 3;
 115       YUV2RGB(*pY, *pCb, *pCr, (RGB *)destbuffer);
 116       pY += 2; pCb += 4; pCr += 4; destbuffer += 3;
 117    }
 118 }
 119
 120 static void Parse_UYYVYY(unsigned char *destbuffer, const unsigned char *input, int width, int height)
 121 {
 122    const unsigned char *pY, *pCb, *pCr;
 123    int togo = width * height / 4;
 124    pY = input+1;
 125    pCb = input;
 126    pCr = input+4;
 127    while (--togo) {
 128       YUV2RGB(*pY, *pCb, *pCr, (RGB *)destbuffer);
 129       destbuffer += 3; pY++;
 130       YUV2RGB(*pY, *pCb, *pCr, (RGB *)destbuffer);
 131       pY += 2; destbuffer += 3;
 132       YUV2RGB(*pY, *pCb, *pCr, (RGB *)destbuffer);
 133       destbuffer += 3; pY++;
 134       YUV2RGB(*pY, *pCb, *pCr, (RGB *)destbuffer);
 135       pY += 2; pCb += 6; pCr += 6; destbuffer += 3;
 136    }
 137 }
 138
 139 static void Parse_PYUV(unsigned char *destbuffer, const unsigned char *input, int width, int height, int wstep, int hstep)
 140 {
 141    /* We have 3 pointers, One to Y, one to Cb and 1 to Cr */
 142
 143 /* C19 *89* declaration block (Grr julliard for not allowing C99) */
 144    int ysize, uvsize;
 145    const unsigned char *pY, *pCb, *pCr;
 146    int swstep = 0, shstep = 0;
 147    int ypos = 0, xpos = 0;
 148    int indexUV = 0, cUv;
 149 /* End of Grr */
 150
 151    ysize = width * height;
 152    uvsize = (width / wstep) * (height / hstep);
 153    pY = input;
 154    pCb = pY + ysize;
 155    pCr = pCb + uvsize;
 156    /* Bottom down DIB */
 157    do {
 158       swstep = 0;
 159       cUv = indexUV;
 160       for (xpos = 0; xpos < width; xpos++) {
 161          YUV2RGB(*(pY++), pCb[cUv], pCr[cUv], (RGB *)destbuffer);
 162          destbuffer += 3;
 163          if (++swstep == wstep) {
 164             cUv++;
 165             swstep = 0;
 166          }
 167       }
 168       if (++shstep == hstep) {
 169          shstep = 0;
 170          indexUV = cUv;
 171       }
 172    } while (++ypos < height);
 173 }
 174
 175 void YUV_To_RGB24(enum YUV_Format format, unsigned char *target, const unsigned char *source, int width, int height) {
 176    int wstep, hstep;
 177    if (format < ENDPLANAR) {
 178       switch (format) {
 179          case YUVP_421: wstep = 2; hstep = 1; break;
 180          case YUVP_422: wstep = 2; hstep = 2; break;
 181          case YUVP_441: wstep = 4; hstep = 1; break;
 182          case YUVP_444: wstep = 4; hstep = 4; break;
 183          default: ERR("Unhandled format \"%d\"\n", format); return;
 184       }
 185       Parse_PYUV(target, source, width, height, wstep, hstep);
 186    } else {
 187       switch (format) {
 188          case YUYV: Parse_YUYV(target, source, width, height); return;
 189          case UYVY: Parse_UYVY(target, source, width, height); return;
 190          case UYYVYY: Parse_UYYVYY(target, source, width, height); return;
 191          default: ERR("Unhandled format \"%d\"\n", format); return;
 192       }
 193    }
 194 }