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
105
106
107
108
109
|
#define _XOPEN_SOURCE 500
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <unistd.h>
#include "video_decode.h"
static double
frame_diff(struct video_frame *frame_a, struct video_frame *frame_b)
{
double average = 0;
uint8_t *row_a = frame_a->data, *col_a = NULL;
uint8_t *row_b = frame_b->data, *col_b = NULL;
for (int y = 0; y < frame_a->height; ++y) {
col_a = row_a;
col_b = row_b;
for (int x = 0; x < frame_a->width; ++x) {
average += abs(*col_a - *col_b);
col_a++;
col_b++;
}
row_a += frame_a->stride;
row_b += frame_b->stride;
}
return average / (frame_a->width * frame_a->height);
}
static double
frame_average(struct video_frame *frame)
{
double average = 0;
uint8_t *row = frame->data;
uint8_t *col = NULL;
for (int y = 0; y < frame->height; ++y) {
col = row;
for (int x = 0; x < frame->width; ++x) {
average += *col;
col++;
}
row += frame->stride;
}
return average / (frame->width * frame->height);
}
static void
usage(void)
{
fprintf(stderr, "advtime [-a] [-d] FILE\n");
exit(EXIT_FAILURE);
}
int
main(int argc, char **argv)
{
struct video_decode *vd;
struct video_frame *frame_a;
struct video_frame *frame_b;
int ret, ch;
int diff_flag = 0, average_flag = 0;
int64_t timestamp = 0;
while ((ch = getopt(argc, argv, "ad")) != -1) {
switch (ch) {
case 'a':
average_flag = 1;
break;
case 'd':
diff_flag = 1;
break;
default:
usage();
/* NOTREACHED */
}
}
argc -= optind;
argv += optind;
if (argc < 1)
usage();
if (argc == 2 && strtol(argv[1], NULL, 10) > 0)
timestamp = strtol(argv[1], NULL, 10);
ret = video_decode_init(&vd, argv[0], timestamp);
if (ret < 0)
return -ret;
ret = video_decode_get_frame(vd, &frame_a);
if (ret < 0)
return -ret;
while (video_decode_get_frame(vd, &frame_b) == 0) {
if (average_flag == 1)
printf("%f\n", frame_average(frame_a));
if (diff_flag == 1)
printf("%f\n", frame_diff(frame_a, frame_b));
video_decode_free_frame(&frame_a);
frame_a = frame_b;
}
video_decode_free_frame(&frame_b);
video_decode_uninit(&vd);
return EXIT_SUCCESS;
}
|
