1 /*
2 * Simple xawtv deinterlacing plugin - line doubling
3 *
4 * CAVEATS: Effectively halves framerate and vertical resolution
5 * Framerate problem is to be addressed, vertical resolution problem is
6 * inherent in line doubling. Use one of the interpolating (or blending, when
7 * we write them) filters.
8 *
9 * BENEFITS: It's no longer interlaced ;) thats about it.
10 *
11 * AUTHORS:
12 * Conrad Kreyling <conrad@conrad.nerdland.org>
13 * Patrick Barrett <yebyen@nerdland.org>
14 *
15 * This is licenced under the GNU GPL until someone tells me I'm stealing code
16 * and can't do that ;) www.gnu.org for any version of the license.
17 *
18 * Based on xawtv-3.67/libng/plugins/flt-nop.c (also GPL)
19 */
20
21
22 #include "config.h"
23
24 #include <stdio.h>
25 #include <stdlib.h>
26 #include <pthread.h>
27
28 #include "grab-ng.h"
29
30 static void inline
31 deinterlace(struct ng_video_buf *frame)
32 {
33 unsigned int x,y;
34
35 for (y = 1; y < frame->fmt.height; y += 2)
36 for (x = 0; x < frame->fmt.bytesperline + 1; x++)
37 frame->data[(y * frame->fmt.bytesperline) + x] =
38 frame->data[((y - 1) * frame->fmt.bytesperline) + x];
39 }
40
41
42 static void *init(struct ng_video_fmt *out)
43 {
44 /* don't have to carry around status info */
45 static int dummy;
46 return &dummy;
47 }
48
49 static struct ng_video_buf*
50 frame(void *handle, struct ng_video_buf *frame)
51 {
52 deinterlace(frame); // In hindsight, we may not have needed the function ;)
53 // Added clarity when we make it more complicated.
54 return frame;
55 }
56
57 static void fini(void *handle)
58 {
59 /* nothing to clean up */
60 }
61
62 /* ------------------------------------------------------------------- */
63
64 static struct ng_filter filter = {
65 name: "line doubler deinterlace",
66 fmts:
67 (1 << VIDEO_GRAY) |
68 (1 << VIDEO_RGB15_NATIVE) |
69 (1 << VIDEO_RGB16_NATIVE) |
70 (1 << VIDEO_BGR24) |
71 (1 << VIDEO_RGB24) |
72 (1 << VIDEO_BGR32) |
73 (1 << VIDEO_RGB32) |
74 (1 << VIDEO_YUYV) |
75 (1 << VIDEO_UYVY),
76 init: init,
77 frame: frame,
78 fini: fini,
79 };
80
81 extern void ng_plugin_init(void);
82 void ng_plugin_init(void)
83 {
84 ng_filter_register(NG_PLUGIN_MAGIC,__FILE__,&filter);
85 }
86
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