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
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
|
#define _XOPEN_SOURCE 500
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <unistd.h>
#include "video_decode.h"
#include "util.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;
double diff = 0.0;
char filename[BUFSIZ];
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;
for (int i = 0; video_decode_get_frame(vd, &frame_b) > 0; ++i) {
printf("%d\t", i);
if (average_flag == 1)
printf("%f", frame_average(frame_a));
if (average_flag == 1 && diff_flag == 1)
printf("\t");
if (diff_flag == 1)
printf("%f", diff = frame_diff(frame_a, frame_b));
if (diff > 40.0) {
snprintf(filename, BUFSIZ, "img/%04i.pgm", i);
frame_mix(frame_a, frame_b);
if (pgm_save(frame_a->data, frame_a->stride,
frame_a->width, frame_a->height,
filename) < 0)
exit(EXIT_FAILURE);
}
printf("\n");
video_decode_free_frame(&frame_a);
frame_a = frame_b;
}
video_decode_free_frame(&frame_b);
video_decode_uninit(&vd);
return EXIT_SUCCESS;
}
|
