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#define _XOPEN_SOURCE 500
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <unistd.h>
#include "video_decode.h"
#include "util.h"
static inline void
pswap(void **p1, void **p2)
{
void *tmp;
tmp = *p1;
*p1 = *p2;
*p2 = tmp;
}
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 void
usage(void)
{
fprintf(stderr, "overlap [OPTIONS] FIRST_VIDEO SECOND_VIDEO\n"
"\n"
"OPTIONS\n"
"\t-d\tprint diff for every frame\n"
"\t-t\tmax duration to find overlap in milliseconds\n"
"\t\t(default 60000 = 1 min)\n");
exit(EXIT_FAILURE);
}
int
main(int argc, char **argv)
{
struct video_decode *first_vd;
struct video_decode *second_vd;
struct video_frame *cur_frame = NULL, *last_frame = NULL;
int ret, ch;
int diff_flag = 0;
int64_t timestamp = 0;
int64_t duration = 60 * 1000; /* duration for searching min_diff */
/* default 1 min = 60 sec * 1000 msec */
int64_t min_diff_time = 0; /* dts at overlaping frame */
double min_diff, diff = 0.0;
while ((ch = getopt(argc, argv, "dt")) != -1) {
switch (ch) {
case 'd':
diff_flag = 1; /* print diff of every frame */
break;
case 't':
duration = strtol(optarg, NULL, 10);
break;
default:
usage();
/* NOTREACHED */
}
}
argc -= optind;
argv += optind;
if (argc < 2)
usage();
ret = video_decode_init(&first_vd, argv[0], timestamp);
if (ret < 0)
return -ret;
/* just get last frame of move */
video_decode_seek(first_vd, first_vd->duration);
for (int i = 0; video_decode_get_frame(first_vd, &last_frame) > 0; ++i);
ret = video_decode_init(&second_vd, argv[1], timestamp);
if (ret < 0)
return -ret;
for (int i = 0; video_decode_get_frame(second_vd, &cur_frame) > 0; ++i){
diff = frame_diff(last_frame, cur_frame);
if (i == 0 || diff <= min_diff) {
min_diff = diff;
min_diff_time = cur_frame->dts;
}
if (diff_flag)
printf("%ji %f\n", cur_frame->dts, diff);
if (cur_frame->dts > duration)
break;
}
if (!diff_flag) {
print_time(min_diff_time);
printf("\n");
}
video_decode_free_frame(&cur_frame);
video_decode_free_frame(&last_frame);
video_decode_uninit(&first_vd);
video_decode_uninit(&second_vd);
return EXIT_SUCCESS;
}
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