drivers/staging/easycap/easycap_testcard.c

   1 /******************************************************************************
   2 *                                                                             *
   3 *  easycap_testcard.c                                                         *
   4 *                                                                             *
   5 ******************************************************************************/
   6 /*
   7  *
   8  *  Copyright (C) 2010 R.M. Thomas  <rmthomas@sciolus.org>
   9  *
  10  *
  11  *  This is free software; you can redistribute it and/or modify
  12  *  it under the terms of the GNU General Public License as published by
  13  *  the Free Software Foundation; either version 2 of the License, or
  14  *  (at your option) any later version.
  15  *
  16  *  The software is distributed in the hope that it will be useful,
  17  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  *  GNU General Public License for more details.
  20  *
  21  *  You should have received a copy of the GNU General Public License
  22  *  along with this software; if not, write to the Free Software
  23  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  24  *
  25 */
  26 /*****************************************************************************/
  27
  28 #include "easycap.h"
  29
  30 /*****************************************************************************/
  31 #define TESTCARD_BYTESPERLINE (2 * 720)
  32 void
  33 easycap_testcard(struct easycap *peasycap, int field)
  34 {
  35         int total;
  36         int y, u, v, r, g, b;
  37         unsigned char uyvy[4];
  38         int i1, line, k, m, n, more, much, barwidth, barheight;
  39         unsigned char bfbar[TESTCARD_BYTESPERLINE / 8], *p1, *p2;
  40         struct data_buffer *pfield_buffer;
  41
  42         if (!peasycap) {
  43                 SAY("ERROR: peasycap is NULL\n");
  44                 return;
  45         }
  46         JOM(8, "%i=field\n", field);
  47         switch (peasycap->width) {
  48         case 720:
  49         case 360: {
  50                 barwidth = (2 * 720) / 8;
  51                 break;
  52         }
  53         case 704:
  54         case 352: {
  55                 barwidth = (2 * 704) / 8;
  56                 break;
  57         }
  58         case 640:
  59         case 320: {
  60                 barwidth = (2 * 640) / 8;
  61                 break;
  62         }
  63         default: {
  64                 SAM("ERROR:  cannot set barwidth\n");
  65                 return;
  66         }
  67         }
  68         if (TESTCARD_BYTESPERLINE < barwidth) {
  69                 SAM("ERROR: barwidth is too large\n");
  70                 return;
  71         }
  72         switch (peasycap->height) {
  73         case 576:
  74         case 288: {
  75                 barheight = 576;
  76                 break;
  77         }
  78         case 480:
  79         case 240: {
  80                 barheight = 480;
  81                 break;
  82         }
  83         default: {
  84                 SAM("ERROR: cannot set barheight\n");
  85                 return;
  86         }
  87         }
  88         total = 0;
  89         k = field;
  90         m = 0;
  91         n = 0;
  92
  93         for (line = 0;  line < (barheight / 2);  line++) {
  94                 for (i1 = 0;  i1 < 8;  i1++) {
  95                         r = (i1 * 256)/8;
  96                         g = (i1 * 256)/8;
  97                         b = (i1 * 256)/8;
  98
  99                         y =  299*r/1000 + 587*g/1000 + 114*b/1000 ;
 100                         u = -147*r/1000 - 289*g/1000 + 436*b/1000 ;
 101                         u = u + 128;
 102                         v =  615*r/1000 - 515*g/1000 - 100*b/1000 ;
 103                         v = v + 128;
 104
 105                         uyvy[0] =  0xFF & u ;
 106                         uyvy[1] =  0xFF & y ;
 107                         uyvy[2] =  0xFF & v ;
 108                         uyvy[3] =  0xFF & y ;
 109
 110                         p1 = &bfbar[0];
 111                         while (p1 < &bfbar[barwidth]) {
 112                                 *p1++ = uyvy[0] ;
 113                                 *p1++ = uyvy[1] ;
 114                                 *p1++ = uyvy[2] ;
 115                                 *p1++ = uyvy[3] ;
 116                                 total += 4;
 117                         }
 118
 119                         p1 = &bfbar[0];
 120                         more = barwidth;
 121
 122                         while (more) {
 123                                 if ((FIELD_BUFFER_SIZE/PAGE_SIZE) <= m) {
 124                                         SAM("ERROR:  bad m reached\n");
 125                                         return;
 126                                 }
 127                                 if (PAGE_SIZE < n) {
 128                                         SAM("ERROR:  bad n reached\n");
 129                                         return;
 130                                 }
 131
 132                                 if (0 > more) {
 133                                         SAM("ERROR:  internal fault\n");
 134                                         return;
 135                                 }
 136
 137                                 much = PAGE_SIZE - n;
 138                                 if (much > more)
 139                                         much = more;
 140                                 pfield_buffer = &peasycap->field_buffer[k][m];
 141                                 p2 = pfield_buffer->pgo + n;
 142                                 memcpy(p2, p1, much);
 143
 144                                 p1 += much;
 145                                 n += much;
 146                                 more -= much;
 147                                 if (PAGE_SIZE == n) {
 148                                         m++;
 149                                         n = 0;
 150                                 }
 151                         }
 152                 }
 153         }
 154         return;
 155 }