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