/drivers/staging/easycap/easycap_testcard.c
C | 155 lines | 116 code | 12 blank | 27 comment | 14 complexity | 693ddab303f0a7a059fb6a818508114b MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
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)
32void
33easycap_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}