1 /* DirectShow capture services (QCAP.DLL)
3 * Copyright 2005 Maarten Lankhorst
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..
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.
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.
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
31 #include "qcap_main.h"
32 #include "wine/debug.h"
34 /* This is not used if V4L support is missing */
35 #ifdef HAVE_LINUX_VIDEODEV_H
37 WINE_DEFAULT_DEBUG_CHANNEL(qcap);
39 static int yuv_xy[256]; /* Gray value */
40 static int yuv_gu[256]; /* Green U */
41 static int yuv_bu[256]; /* Blue U */
42 static int yuv_rv[256]; /* Red V */
43 static int yuv_gv[256]; /* Green V */
44 static int initialised = 0;
46 static inline int ValidRange(int in) {
47 if (in > 255) in = 255;
53 #if 0 /* For some reason I have to revert R and B, not sure why */
54 unsigned char r, g, b;
56 unsigned char b, g, r;
60 static inline void YUV2RGB(const unsigned char y_, const unsigned char cb, const unsigned char cr, RGB* retval) {
61 retval->r = ValidRange(yuv_xy[y_] + yuv_rv[cr]);
62 retval->g = ValidRange(yuv_xy[y_] + yuv_gu[cb] + yuv_gv[cr]);
63 retval->b = ValidRange(yuv_xy[y_] + yuv_bu[cb]);
70 if (initialised++) return;
72 for (y_ = 0; y_ <= 255; y_++)
74 y = ((float) 255 / 219) * (y_ - 16);
78 for (cb = 0; cb <= 255; cb++)
80 u = ((float) 255 / 224) * (cb - 128);
81 yuv_gu[cb] = -0.344 * u;
82 yuv_bu[cb] = 1.772 * u;
85 for (cr = 0; cr <= 255; cr++)
87 v = ((float) 255 / 224) * (cr - 128);
88 yuv_rv[cr] = 1.402 * v;
89 yuv_gv[cr] = -0.714 * v;
91 TRACE("Filled hash table\n");
94 static void Parse_YUYV(unsigned char *destbuffer, const unsigned char *input, int width, int height)
96 const unsigned char *pY, *pCb, *pCr;
97 int togo = width * height / 2;
102 YUV2RGB(*pY, *pCb, *pCr, (RGB *)destbuffer);
103 pY += 2; destbuffer += 3;
104 YUV2RGB(*pY, *pCb, *pCr, (RGB *)destbuffer);
105 pY += 2; pCb += 4; pCr += 4; destbuffer += 3;
109 static void Parse_UYVY(unsigned char *destbuffer, const unsigned char *input, int width, int height)
111 const unsigned char *pY, *pCb, *pCr;
112 int togo = width * height / 2;
117 YUV2RGB(*pY, *pCb, *pCr, (RGB *)destbuffer);
118 pY += 2; destbuffer += 3;
119 YUV2RGB(*pY, *pCb, *pCr, (RGB *)destbuffer);
120 pY += 2; pCb += 4; pCr += 4; destbuffer += 3;
124 static void Parse_UYYVYY(unsigned char *destbuffer, const unsigned char *input, int width, int height)
126 const unsigned char *pY, *pCb, *pCr;
127 int togo = width * height / 4;
132 YUV2RGB(*pY, *pCb, *pCr, (RGB *)destbuffer);
133 destbuffer += 3; pY++;
134 YUV2RGB(*pY, *pCb, *pCr, (RGB *)destbuffer);
135 pY += 2; destbuffer += 3;
136 YUV2RGB(*pY, *pCb, *pCr, (RGB *)destbuffer);
137 destbuffer += 3; pY++;
138 YUV2RGB(*pY, *pCb, *pCr, (RGB *)destbuffer);
139 pY += 2; pCb += 6; pCr += 6; destbuffer += 3;
143 static void Parse_PYUV(unsigned char *destbuffer, const unsigned char *input, int width, int height, int wstep, int hstep)
145 /* We have 3 pointers, One to Y, one to Cb and 1 to Cr */
147 /* C19 *89* declaration block (Grr julliard for not allowing C99) */
149 const unsigned char *pY, *pCb, *pCr;
150 int swstep = 0, shstep = 0;
151 int ypos = 0, xpos = 0;
152 int indexUV = 0, cUv;
155 ysize = width * height;
156 uvsize = (width / wstep) * (height / hstep);
160 /* Bottom down DIB */
164 for (xpos = 0; xpos < width; xpos++) {
165 YUV2RGB(*(pY++), pCb[cUv], pCr[cUv], (RGB *)destbuffer);
167 if (++swstep == wstep) {
172 if (++shstep == hstep) {
176 } while (++ypos < height);
179 void YUV_To_RGB24(enum YUV_Format format, unsigned char *target, const unsigned char *source, int width, int height) {
181 if (format < ENDPLANAR) {
183 case YUVP_421: wstep = 2; hstep = 1; break;
184 case YUVP_422: wstep = 2; hstep = 2; break;
185 case YUVP_441: wstep = 4; hstep = 1; break;
186 case YUVP_444: wstep = 4; hstep = 4; break;
187 default: ERR("Unhandled format \"%d\"\n", format); return;
189 Parse_PYUV(target, source, width, height, wstep, hstep);
192 case YUYV: Parse_YUYV(target, source, width, height); return;
193 case UYVY: Parse_UYVY(target, source, width, height); return;
194 case UYYVYY: Parse_UYYVYY(target, source, width, height); return;
195 default: ERR("Unhandled format \"%d\"\n", format); return;