FFMPEG入门[通俗易懂]

/** 
 * Split Y, U, V planes in YUV420P file. 
 * @param url  Location of Input YUV file. 
 * @param w    Width of Input YUV file. 
 * @param h    Height of Input YUV file. 
 * @param num  Number of frames to process. 
 * 
 */  

// simplest_yuv420_split("test_yuv420p.yuv",256,256,1);
int simplest_yuv420_split(char *url, int w, int h,int num){  
    FILE *fp=fopen(url,"rb+");  
    FILE *fp1=fopen("output_420_y.y","wb+");  
    FILE *fp2=fopen("output_420_u.y","wb+");  
    FILE *fp3=fopen("output_420_v.y","wb+");  
  
    unsigned char *pic=(unsigned char *)malloc(w*h*3/2);  
  
    for(int i=0;i<num;i++){  
  
        fread(pic,1,w*h*3/2,fp);  
        //Y  
        fwrite(pic,1,w*h,fp1);  
        //U  
        fwrite(pic+w*h,1,w*h/4,fp2);  
        //V  
        fwrite(pic+w*h*5/4,1,w*h/4,fp3);  
    }  
  
    free(pic);  
    fclose(fp);  
    fclose(fp1);  
    fclose(fp2);  
    fclose(fp3);  
  
    return 0;  
}