/******************************************************** * Some code. Copyright (C) 2003 by Pascal Massimino.   * * All Rights Reserved.      (http://skal.planet-d.net) * * For Educational/Academic use ONLY. See 'LICENSE.TXT'.* ********************************************************//* * small RGB -> YUV converter * ********************************************************/#include "skl_mpg4_c.h"#include <stdio.h>#include <stdlib.h>int main(int argc, char *argv[]){  if (argc<=2) {    printf( "Usage :%s [in PPM] [out PGM]\n", argv[0] );    return -1;  }  const char *In_Name  = argv[1];  const char *Out_Name = argv[2];  FILE *In  = fopen(In_Name, "rb");  if (In==0) {    printf( "Error opening In file [%s]\n", In_Name );    return -1;  }  FILE *Out = fopen(Out_Name, "wb");  if (Out==0) {    printf( "Error opening Out file [%s]\n", Out_Name );    fclose(In);    return -1;  }  SKL_YUV_DSP Dsp;  Skl_Init_YUV_DSP(&Dsp, SKL_CPU_DETECT);  int W=0, H=0;  unsigned char *RGB = 0, *YUV = 0;    while(1)  {    int w,h;    if (fscanf(In, "P6\n%d %d\n255\n", &w, &h)!=2)      break;    if (W>0 && (w!=W || h!=H)) {      printf( "Size changed from %dx%d to %dx%d!\n", W,H, w,h );      break;    }    W = w;    H = h;          if (RGB==0) {      printf( "Input size: %dx%d\n", W, H);      RGB = (unsigned char *)malloc(W*H*3);      YUV = (unsigned char *)malloc(W*H*3/2);      if (RGB==0 || YUV==0) {        printf( "Memory allocation error!\n" );        break;      }    }    if (fread(RGB, 3*W*H, 1, In)!=1)      break;        Dsp.RGB24_TO_YUV(YUV, YUV+W*H, YUV+W*H+W/2, W, RGB,3*W, W,H);    fprintf(Out, "P5\n%d %d\n255\n", W, H*3/2);    fwrite(YUV, W*H*3/2, 1, Out);      }  if (RGB!=0) free(RGB);  if (YUV!=0) free(YUV);  fclose(In);  fclose(Out);  return 0;}