#include <stdio.h>

#include "video_decode.h"
#include "util.h"

int
pgm_save(unsigned char *buf, int wrap, int xsize, int ysize, char *filename)
{
	FILE *f;
	int i;

	f = fopen(filename, "w");
	if (f == NULL)
		return -1;
	fprintf(f, "P5\n%d %d\n%d\n", xsize, ysize, 255);
	for(i = 0; i < ysize; i++)
		fwrite(buf + i * wrap, 1, xsize, f);
	fclose(f);

	return 0;
}

void
frame_mix(struct video_frame *frame_a, struct video_frame *frame_b)
{
        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) {
			if (x > frame_a->width / 2)
	                        *col_a = *col_b;
                        col_a++;
                        col_b++;
                }
                row_a += frame_a->stride;
                row_b += frame_b->stride;
        }
}

/* print time in format: "hh:mm:ss.xxx" */
void
print_time(int64_t msec) {

	int hh = msec / 1000 / 60 / 60;
	msec -= hh * 1000 * 60 * 60;
	int mm = msec / 1000 / 60;
	msec -= mm * 1000 * 60;
	int ss = msec / 1000;
	msec -= ss * 1000;

	printf("%02d:%02d:%02d.%03jd", hh, mm, ss, msec);
}