SDL_cgxyuv.c
1
2
/*
SDL - Simple DirectMedia Layer
3
Copyright (C) 1997-2006 Sam Lantinga
4
5
This library is free software; you can redistribute it and/or
6
modify it under the terms of the GNU Lesser General Public
7
License as published by the Free Software Foundation; either
8
version 2.1 of the License, or (at your option) any later version.
9
10
11
12
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13
Lesser General Public License for more details.
15
16
17
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18
19
Sam Lantinga
20
slouken@libsdl.org
21
22
23
24
25
26
27
28
29
30
31
32
*/
/* This is the XFree86 Xv extension implementation of YUV video overlays */
#ifdef XFREE86_XV
#include <X11/Xlib.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#include <X11/extensions/XShm.h>
#include <X11/extensions/Xvlib.h>
33
34
#include "SDL_stdlib.h"
#include "SDL_string.h"
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
#include "SDL_error.h"
#include "SDL_video.h"
#include "SDL_x11yuv_c.h"
#include "SDL_yuvfuncs.h"
/* The functions used to manipulate software video overlays */
static struct private_yuvhwfuncs x11_yuvfuncs = {
X11_LockYUVOverlay,
X11_UnlockYUVOverlay,
X11_DisplayYUVOverlay,
X11_FreeYUVOverlay
};
struct private_yuvhwdata {
int port;
XShmSegmentInfo yuvshm;
XvImage *image;
};
SDL_Overlay *X11_CreateYUVOverlay(_THIS, int width, int height, Uint32 format, SDL_Surface *display)
{
SDL_Overlay *overlay;
struct private_yuvhwdata *hwdata;
int xv_port;
int i, j;
int adaptors;
XvAdaptorInfo *ainfo;
XShmSegmentInfo *yuvshm;
xv_port = -1;
if ( (Success == XvQueryExtension(GFX_Display, &j, &j, &j, &j, &j)) &&
(Success == XvQueryAdaptors(GFX_Display,
RootWindow(GFX_Display, SDL_Screen),
&adaptors, &ainfo)) ) {
for ( i=0; (i<adaptors) && (xv_port == -1); ++i ) {
if ( (ainfo[i].type & XvInputMask) &&
(ainfo[i].type & XvImageMask) ) {
int num_formats;
XvImageFormatValues *formats;
formats = XvListImageFormats(GFX_Display,
ainfo[i].base_id, &num_formats);
for ( j=0; j<num_formats; ++j ) {
if ( (Uint32)formats[j].id == format ) {
xv_port = ainfo[i].base_id;
break;
}
}
}
}
}
if ( xv_port == -1 ) {
SDL_SetError("No available video ports for requested format");
return(NULL);
}
/* Create the overlay structure */
92
overlay = (SDL_Overlay *)SDL_malloc(sizeof *overlay);
93
94
95
96
if ( overlay == NULL ) {
SDL_OutOfMemory();
return(NULL);
}
97
SDL_memset(overlay, 0, (sizeof *overlay));
98
99
100
101
102
103
104
105
106
107
/* Fill in the basic members */
overlay->format = format;
overlay->w = width;
overlay->h = height;
/* Set up the YUV surface function structure */
overlay->hwfuncs = &x11_yuvfuncs;
/* Create the pixel data and lookup tables */
108
hwdata = (struct private_yuvhwdata *)SDL_malloc(sizeof *hwdata);
109
110
111
112
113
114
115
overlay->hwdata = hwdata;
if ( hwdata == NULL ) {
SDL_OutOfMemory();
SDL_FreeYUVOverlay(overlay);
return(NULL);
}
yuvshm = &hwdata->yuvshm;
116
SDL_memset(yuvshm, 0, sizeof(*yuvshm));
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
hwdata->port = xv_port;
hwdata->image = XvShmCreateImage(GFX_Display, xv_port, format,
0, width, height, yuvshm);
if ( hwdata->image == NULL ) {
SDL_OutOfMemory();
SDL_FreeYUVOverlay(overlay);
return(NULL);
}
yuvshm->shmid = shmget(IPC_PRIVATE, hwdata->image->data_size,
IPC_CREAT | 0777);
if ( yuvshm->shmid < 0 ) {
SDL_SetError("Unable to get %d bytes shared memory",
hwdata->image->data_size);
SDL_FreeYUVOverlay(overlay);
return(NULL);
}
yuvshm->shmaddr = (caddr_t) shmat(yuvshm->shmid, 0, 0);
yuvshm->readOnly = False;
hwdata->image->data = yuvshm->shmaddr;
XShmAttach(GFX_Display, yuvshm);
XSync(GFX_Display, False);
shmctl(yuvshm->shmid, IPC_RMID, 0);
/* We're all done.. */
return(overlay);
}
int X11_LockYUVOverlay(_THIS, SDL_Overlay *overlay)
{
overlay->pixels = overlay->hwdata->image->data;
/* What should the pitch be set to? */
return(0);
}
void X11_UnlockYUVOverlay(_THIS, SDL_Overlay *overlay)
{
overlay->pixels = NULL;
}
int X11_DisplayYUVOverlay(_THIS, SDL_Overlay *overlay, SDL_Rect *dstrect)
{
struct private_yuvhwdata *hwdata;
hwdata = overlay->hwdata;
XvShmPutImage(GFX_Display, hwdata->port, SDL_Window, SDL_GC,
hwdata->image, 0, 0, overlay->w, overlay->h,
dstrect->x, dstrect->y, dstrect->w, dstrect->h, False);
XSync(GFX_Display, False);
return(0);
}
void X11_FreeYUVOverlay(_THIS, SDL_Overlay *overlay)
{
struct private_yuvhwdata *hwdata;
hwdata = overlay->hwdata;
if ( hwdata ) {
if ( hwdata->yuvshm.shmaddr ) {
XShmDetach(GFX_Display, &hwdata->yuvshm);
shmdt(hwdata->yuvshm.shmaddr);
}
if ( hwdata->image ) {
XFree(hwdata->image);
}
182
SDL_free(hwdata);
183
184
185
186
}
}
#endif /* XFREE86_XV */