func: int ff_set_systematic_pal2(uint32_t pal[256], enum AVPixelFormat pix_fmt)
  
  {
  
      int i;
  
  
  
      for (i = 0; i < 256; i++) {
  
          int r, g, b;
  
  
  
          switch (pix_fmt) {
  
          case AV_PIX_FMT_RGB8:
  
              r = (i>>5    )*36;
  
              g = ((i>>2)&7)*36;
  
              b = (i&3     )*85;
  
              break;
  
          case AV_PIX_FMT_BGR8:
  
              b = (i>>6    )*85;
  
              g = ((i>>3)&7)*36;
  
              r = (i&7     )*36;
  
              break;
  
          case AV_PIX_FMT_RGB4_BYTE:
  
              r = (i>>3    )*255;
  
              g = ((i>>1)&3)*85;
  
              b = (i&1     )*255;
  
              break;
  
          case AV_PIX_FMT_BGR4_BYTE:
  
              b = (i>>3    )*255;
  
              g = ((i>>1)&3)*85;
  
              r = (i&1     )*255;
  
              break;
  
          case AV_PIX_FMT_GRAY8:
  
              r = b = g = i;
  
              break;
  
          default:
  
              return AVERROR(EINVAL);
  
          }
  
          pal[i] = b + (g<<8) + (r<<16) + (0xFF<<24);
  
      }
  
  
  
      return 0;
  
  }
  