1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
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
92
93
94
95
96
97
98
99
100
101
102
103
104
|
/*
* Copyright (c) 2012 Rudolf Polzer <divVerent@xonotic.org>
*
* This file is part of mpv's vf_dlopen examples.
*
* mpv's vf_dlopen examples are free software; you can redistribute them and/or
* modify them under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of the
* License, or (at your option) any later version.
*
* mpv's vf_dlopen examples are distributed in the hope that they will be
* useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
* General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with mpv's vf_dlopen examples; if not, write to the Free
* Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "vf_dlopen.h"
#include "filterutils.h"
#define MIN(a,b) ((a)<(b)?(a):(b))
/*
* frame stepping filter
*
* usage: -vf dlopen=./framestep.so:5
*
* outputs every 5th frame
*
* usage: -vf dlopen=./framestep.so:5:3
*
* outputs every 5th frame, starting with frame index 3 (default: 0)
*/
typedef struct {
int step, pos;
} framestep_data_t;
static int framestep_put_image(struct vf_dlopen_context *ctx)
{
framestep_data_t *framestep = ctx->priv;
// stepping
if (framestep->pos < 0)
return 0;
--framestep->pos;
if (framestep->pos >= 0)
return 0;
framestep->pos += framestep->step;
// copying
assert(ctx->inpic.planes == ctx->outpic[0].planes);
int np = ctx->inpic.planes;
int p;
for (p = 0; p < np; ++p) {
assert(ctx->inpic.planewidth[p] == ctx->outpic->planewidth[p]);
assert(ctx->inpic.planeheight[p] == ctx->outpic->planeheight[p]);
copy_plane(
ctx->outpic->plane[p],
ctx->outpic->planestride[p],
ctx->inpic.plane[p],
ctx->inpic.planestride[p],
MIN(ctx->inpic.planestride[p], ctx->outpic->planestride[p]),
ctx->inpic.planeheight[p]
);
}
ctx->outpic->pts = ctx->inpic.pts;
return 1;
}
void framestep_uninit(struct vf_dlopen_context *ctx)
{
free(ctx->priv);
}
int vf_dlopen_getcontext(struct vf_dlopen_context *ctx, int argc, const char **argv)
{
VF_DLOPEN_CHECK_VERSION(ctx);
if (argc != 1 && argc != 2)
return -1;
framestep_data_t *framestep = malloc(sizeof(framestep_data_t));
memset(framestep, 0, sizeof(*framestep));
framestep->step = atoi(argv[0]);
framestep->pos = (argc >= 2) ? atoi(argv[1]) : 0;
ctx->priv = framestep;
ctx->put_image = framestep_put_image;
ctx->uninit = framestep_uninit;
return 1;
}
|
