42 lines
935 B
C++
42 lines
935 B
C++
|
#include <stdio.h>
|
|||
|
|
#include <stdlib.h>
|
|||
|
|
#include <string.h>
|
|||
|
|
|
|||
|
|
typedef int BOOL;
|
|||
|
|
#define TRUE 1
|
|||
|
|
#define FALSE 0
|
|||
|
|
|
|||
|
|
//分离YUV420P像素数据中的亮度分量Y的数值减半，降低图像的亮度
|
|||
|
|
BOOL yuv420p_half_y(const char *file, int width, int height)
|
|||
|
|
{
|
|||
|
|
if (file == NULL) {
|
|||
|
|
return FALSE;
|
|||
|
|
}
|
|||
|
|
FILE *fp = fopen(file, "rb+");
|
|||
|
|
FILE *fp0 = fopen("./out/output_420p_half_y.yuv", "wb+");
|
|||
|
|
|
|||
|
|
unsigned char *data = (unsigned char *)malloc(width*height*3/2);
|
|||
|
|
memset(data, 0, width*height*3/2);
|
|||
|
|
|
|||
|
|
fread(data, 1, width*height*3/2, fp);
|
|||
|
|
|
|||
|
|
for(int i=0; i<width*height; i++) {
|
|||
|
|
data[i] = data[i] / 2; //Y分量减半
|
|||
|
|
}
|
|||
|
|
fwrite(data, 1, width*height*3/2, fp0);
|
|||
|
|
|
|||
|
|
free(data);
|
|||
|
|
fclose(fp);
|
|||
|
|
fclose(fp0);
|
|||
|
|
|
|||
|
|
return TRUE;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
int main(int argc, char *argv[])
|
|||
|
|
{
|
|||
|
|
if (argc == 4) {
|
|||
|
|
yuv420p_half_y(argv[1], atoi(argv[2]), atoi(argv[3]));
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
return 0;
|
|||
|
|
}
|