YUV422转YUV420P

来源：互联网发布：转移概率矩阵计算方法编辑：程序博客网时间：2024/06/08 05:37

记录下，就当自己的工具了，本来想使用ffmpeg转呢，结果命令行参数太复杂，没搞定，索性直接写吧

#include <stdio.h>#include <stdlib.h>/*#include <cv.h>#include <highgui.h>*/int yuv422_to_yuv420p(unsigned char *pYUV422, unsigned char *pYUV420, int width, int height){        int i,j;unsigned char *pY = pYUV420;unsigned char *pU = pYUV420 + width * height;unsigned char *pV = pU + (width * height)/4;unsigned char *pYUVTemp = pYUV422;unsigned char *pYUVTempNext = pYUV422 + width * 2;        for(i = 0; i < height; i += 2) {for(j = 0; j < width; j += 2) {pY[j] = *pYUVTemp++;    pY[j + width] = *pYUVTempNext++;                         pU[j / 2] =(*(pYUVTemp) + *(pYUVTempNext)) / 2;    pYUVTemp++;    pYUVTempNext++;                         pY[j + 1] = *pYUVTemp++;    pY[j + 1 + width] = *pYUVTempNext++;                         pV[j / 2] =(*(pYUVTemp) + *(pYUVTempNext)) / 2;    pYUVTemp++;    pYUVTempNext++;}    pYUVTemp += width * 2;    pYUVTempNext += width * 2;    pY += width * 2;    pU += width / 2;    pV += width / 2;}return 1;}int main(int argc, char* argv[]){//char *input = "M6_897frames_422.yuv";//char *output = "M6_897frames_420.yuv";//int total_frames = 897;char *input = argv[1];char *output = argv[2];int total_frames = atoi(argv[3]);FILE *fp_yuv422 = fopen(input, "rb");FILE *fp_yuv420 = fopen(output, "wb");if (!fp_yuv422 || !fp_yuv420) {printf("open file failed\n");return -1;}int i = 0;for (i = 0; i < total_frames; i++){printf("processing frame %d\n", i);unsigned char *yuv422_buf = (unsigned char *)malloc(2*1280*720*sizeof(unsigned char));unsigned char *yuv420_buf = (unsigned char *)malloc(3*1280*720/2*sizeof(unsigned char));fread(yuv422_buf, 1, 2*1280*720, fp_yuv422);yuv422_to_yuv420p(yuv422_buf, yuv420_buf, 1280, 720);fwrite(yuv420_buf, 1, 3*1280*720/2, fp_yuv420);free(yuv422_buf);free(yuv420_buf);}fclose(fp_yuv420);fclose(fp_yuv422);return 0;}

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