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Old 13th May 2021, 17:33   #1  |  Link
mikeiz
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Tobias Oelbaum's sgi2yuv utility

I'm trying to find the sgi2yuv program and I'm not finding it. I have a copy, but it looks like the global.h file is corrupted because it has main() and executable code in it. It doesn't look like a header file. I checked Tobias' website using the link in derf's collection, but the site is not found. Any help would be appreciated.

Mike
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Old 13th May 2021, 17:50   #2  |  Link
StainlessS
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Perhaps try google
Code:
"Tobias Oelbaum" NEAR "sgi2yuv"
https://www.google.co.uk/search?q=%2...4dUDCA0&uact=5

EDIT: My UBlock Origin (ad blocker) blocks access to many of those site links, saying is malicious.
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"Some infinities are bigger than other infinities", but how many of them are infinitely bigger ???

Last edited by StainlessS; 13th May 2021 at 17:53.
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Old 13th May 2021, 19:48   #3  |  Link
mikeiz
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This points to the same sites. They use the same link to Tobias' site to get the software but he must have moved it or is not working there anymore.
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Old 13th May 2021, 20:43   #4  |  Link
StainlessS
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This help at all.
from google
Code:
"sgi2yuv" -"Tobias Oelbaum"
https://www.google.co.uk/search?q=+%...4dUDCAg&uact=5

ie, links not mentioning the guys name. [as you say links mentioning his name did not help]
From 2nd link, @ avsforum.com
http://www.w6rz.net/sgitoyuv.zip

Code:
/*
SGI 16-bit RGB to 8-bit 4:2:2 YCbCr (UYVY) conversion
*/

#include <stdio.h>
#include <stdlib.h>

#define	TRUE		1
#define	FALSE		0

void conv444to422(unsigned char *src, unsigned char *dst, int width, int height);

unsigned char *Clip;

int main(int argc, char **argv)
{
	FILE	*fp;
	FILE	*fpout;
	int	length, i, j, horz, vert, index = 0;
	int	r, g, b;
	double	y, u, v;
	double	cr, cg, cb, cu, cv;
	unsigned char	*yp, *up, *vp;
	int	matrix_coefficients = 1;
	unsigned int	py, pcb, pcr;
	static unsigned char	buffer_422output[3840 * 2160 * 2];
	static unsigned char	buffer_422Cb[3840 * 2160 / 2];
	static unsigned char	buffer_422Cr[3840 * 2160 / 2];
	static unsigned char	buffer_444Y[3840 * 2160];
	static unsigned char	buffer_444Cb[3840 * 2160];
	static unsigned char	buffer_444Cr[3840 * 2160];
	static unsigned short	buffer_444input[3840 * 2160 * 3];
	static double coef[7][3] = {
		{0.2126, 0.7152, 0.0722},   /* ITU-R Rec. 709 (2002) */
		{0.299, 0.587, 0.114},      /* unspecified */
		{0.299, 0.587, 0.114},      /* reserved */
		{0.30,  0.59,  0.11},       /* FCC */
		{0.299, 0.587, 0.114},      /* ITU-R Rec. 624-4 System B, G */
		{0.299, 0.587, 0.114},      /* SMPTE 170M */
		{0.212, 0.701, 0.087}};     /* SMPTE 240M (1987) */

	if (argc != 5) {
		fprintf(stderr, "usage: sgitoyuv <horz> <vert> <infile> <outfile>\n");
		exit(-1);
	}

	/*--- open binary file (for parsing) ---*/
	fp = fopen(argv[3], "rb");
	if (fp == 0) {
		fprintf(stderr, "Cannot open input file <%s>\n", argv[3]);
		exit(-1);
	}

	/*--- open binary file (for parsing) ---*/
	fpout = fopen(argv[4], "wb");
	if (fpout == 0) {
		fprintf(stderr, "Cannot open output file <%s>\n", argv[4]);
		exit(-1);
	}

	/* Clip table */
	if (!(Clip=(unsigned char *)malloc(1024)))
		printf("Clip[] malloc failed\n");

	Clip += 384;

	for (i = -384; i < 640; i++)
		Clip[i] = (i<0) ? 0 : ((i>255) ? 255 : i);

	horz = atoi(argv[1]);
	vert = atoi(argv[2]);
	length = fread(&buffer_444input[0], 1, 512, fp);
	length = fread(&buffer_444input[0], 1, (horz * vert * 6), fp);

	i = matrix_coefficients;
	cr = coef[i-1][0];
	cg = coef[i-1][1];
	cb = coef[i-1][2];
	cu = 0.5/(1.0-cb);
	cv = 0.5/(1.0-cr);

	index = ((horz * (vert - 1)));

	for (i = 0; i < vert; i++)
	{
		yp = &buffer_444Y[0] + i*horz;
		up = &buffer_444Cb[0] + i*horz;
		vp = &buffer_444Cr[0] + i*horz;

		for (j =0 ; j < horz; j++)
		{
			r = buffer_444input[index];
			g = buffer_444input[index + (horz*vert)];
			b = buffer_444input[index + (horz*vert*2)];
#if 0
			r = ((r & 0xff) << 8) + ((r & 0xff00) >> 8);
			g = ((g & 0xff) << 8) + ((g & 0xff00) >> 8);
			b = ((b & 0xff) << 8) + ((b & 0xff00) >> 8);
#else
			r = r & 0xff;
			g = g & 0xff;
			b = b & 0xff;
#endif
			index++;

			/* convert to YUV */
			y = cr * r + cg * g + cb * b;
			u = cu*(b-y);
			v = cv*(r-y);
#if 0
			y /= 256;
			u /= 256;
			v /= 256;
#endif
			yp[j] = (219.0/255.0)*y + 16.5;
			up[j] = (224.0/255.0)*u + 128.5;
			vp[j] = (224.0/255.0)*v + 128.5;
		}
		index = index - (horz * 2);
	}
	conv444to422(&buffer_444Cb[0], &buffer_422Cb[0], horz, vert);
	conv444to422(&buffer_444Cr[0], &buffer_422Cr[0], horz, vert);
	py = 0;
	pcb = 0;
	pcr = 0;
	for (i = 0; i < (horz * vert * 2); i++)
	{
		if ((i % 2) == 1)
		{
			buffer_422output[i] = buffer_444Y[py++];
		}
		else if ((i % 4) == 0)
		{
			buffer_422output[i] = buffer_422Cb[pcb++];
		}
		else
		{
			buffer_422output[i] = buffer_422Cr[pcr++];
		}
	}
	fwrite(&buffer_422output[0], 1, (horz * vert * 2), fpout);
	fclose(fp);
	fclose(fpout);
	return 0;
}

/* horizontal filter and 2:1 subsampling */
void conv444to422(unsigned char *src, unsigned char *dst, int width, int height)
{
  int i, j, im5, im4, im3, im2, im1, ip1, ip2, ip3, ip4, ip5, ip6;

  if (0)
  {
    for (j=0; j<height; j++)
    {
      for (i=0; i<width; i+=2)
      {
        im5 = (i<5) ? 0 : i-5;
        im4 = (i<4) ? 0 : i-4;
        im3 = (i<3) ? 0 : i-3;
        im2 = (i<2) ? 0 : i-2;
        im1 = (i<1) ? 0 : i-1;
        ip1 = (i<width-1) ? i+1 : width-1;
        ip2 = (i<width-2) ? i+2 : width-1;
        ip3 = (i<width-3) ? i+3 : width-1;
        ip4 = (i<width-4) ? i+4 : width-1;
        ip5 = (i<width-5) ? i+5 : width-1;
        ip6 = (i<width-5) ? i+6 : width-1;

        /* FIR filter with 0.5 sample interval phase shift */
        dst[i>>1] = Clip[(int)(228*(src[i]+src[ip1])
                         +70*(src[im1]+src[ip2])
                         -37*(src[im2]+src[ip3])
                         -21*(src[im3]+src[ip4])
                         +11*(src[im4]+src[ip5])
                         + 5*(src[im5]+src[ip6])+256)>>9];
      }
      src+= width;
      dst+= width>>1;
    }
  }
  else
  {
    /* MPEG-2 */
    for (j=0; j<height; j++)
    {
      for (i=0; i<width; i+=2)
      {
        im5 = (i<5) ? 0 : i-5;
        im3 = (i<3) ? 0 : i-3;
        im1 = (i<1) ? 0 : i-1;
        ip1 = (i<width-1) ? i+1 : width-1;
        ip3 = (i<width-3) ? i+3 : width-1;
        ip5 = (i<width-5) ? i+5 : width-1;

        /* Original FIR filter coefficients (*512): 22 0 -52 0 159 256 159 0 -52 0 22 */
        /* It's a bug. Filter coefficients must add up to 512!!! */

        /* FIR filter coefficients (*512): 21 0 -52 0 159 256 159 0 -52 0 21 */
        dst[i>>1] = Clip[(int)(  21*(src[im5]+src[ip5])-52*(src[im3]+src[ip3])
                         +159*(src[im1]+src[ip1])+256*src[i]+256)>>9];
      }
      src+= width;
      dst+= width>>1;
    }
  }
}
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"Some infinities are bigger than other infinities", but how many of them are infinitely bigger ???
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Old 13th May 2021, 21:28   #5  |  Link
mikeiz
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Do you have the original global.h file for sgi2yuv?
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Old 13th May 2021, 22:29   #6  |  Link
StainlessS
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No.
As it does not include a [non standard] header, I presume that there aint one.

EDIT:
Arh, there is this, but looks like you have to join a chinese site [with no guarantee that they have it].
Code:
configfile.h
global.h
sgi2yuv.c
sgi2yuv.cfg
configfile.c
sgi2yuv.exe
https://www.dssz.com/594146.html
Google Translated:- https://translate.google.com/transla...om/594146.html

If you know a site where it was once posted, you might find it on Archive.org
[I cant access Archive.org, my ISP blocks it for some reason - I used to be able to access it, not now].
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"Some infinities are bigger than other infinities", but how many of them are infinitely bigger ???

Last edited by StainlessS; 14th May 2021 at 01:12.
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