I have the cvideo example working on my EVM. Now what I am trying to do is convert the YCbCr format to RGB. I think I understand how the data is stored in DDR Ram, at least I am able to produce a good BW image plot in CCS 3.3 image graphic view. My assumption is that Y0,Y2,Y4 etc is store in LUM_TOP buffer, Y1,Y3,Y5 etc is stored in LUM_BOTTOM buffer. CHROM_BOT and CHROM_BOTTOM I think are what have me confused. Is Cb stored in CHROM_TOP and Cr stored in CHROM_BOTTOM? What is the formula to convert from YCrCb to RGB? I have tried the following code below but have not been able to get a good RGB image. The commented code are a number of my different trys. This code is inside a dual r and c for loop, looping through 480X720 rgb values.
Thanks

Dan Block

myrgb = (rgb *)(0xC2000000);
ytop = (unsigned char *)(0xC1000000);
ybottom = (unsigned char *)(0xC1000000 + 240*720);

Cb = (unsigned char *)(0xC1000000 + 2*240*720);
Cr = (unsigned char *)(0xC1000000 + 3*240*720);

/* coeff[] = { 0x2000, 0x2BDD, -0x0AC5, -0x1658, 0x3770 }; */
/* */
/* [ 1.0000 0.0000 1.3707 ] [ Y' - 16 ] [ R'] */
/* [ 1.0000 -0.3365 -0.6982 ] * [ Cb - 128 ] = [ G'] */
/* [ 1.0000 1.7324 0.0000 ] [ Cr - 128 ] [ B'] */
/* */
myrgb[r*720+c].r=(unsigned char)( (ytop[(r/2)*720+c]-16) + 1.3707*(Cr[(r/2)*720+c]-128));myrgb[r*720+c].g=(unsigned char)( (ytop[(r/2)*720+c]-16) - 0.3365*(Cb[(r/2)*720+c]-128) - 0.6982*(Cr[(r/2)*720+c]-128) );myrgb[r*720+c].b=(unsigned char)( (ytop[(r/2)*720+c]-16) + 1.7324*(Cb[(r/2)*720+c]-128) );

myrgb[(r+1)*720+c].r=(unsigned char)( (ybottom[((r+1)/2)*720+c]-16) + 1.3707*(Cr[((r+1)/2)*720+c]-128));
myrgb[(r+1)*720+c].g=(unsigned char)( (ybottom[((r+1)/2)*720+c]-16) - 0.3365*(Cb[((r+1)/2)*720+c]-128) - 0.6982*(Cr[((r+1)/2)*720+c]-128) );
myrgb[(r+1)*720+c].b=(unsigned char)( (ybottom[((r+1)/2)*720+c]-16) + 1.7324*(Cb[((r+1)/2)*720+c]-128));




/* 2. Y'CbCr -> RGB conversion with the 219-level range of Y' */
/* expanded to fill the full RGB dynamic range. (The matrix */
/* has been scaled by 255/219.) Expected ranges are [16..235] */
/* for Y' and [16..240] for Cb and Cr. */
/* */
/* coeff[] = { 0x2543, 0x3313, -0x0C8A, -0x1A04, 0x408D }; */
/* */
/* [ 1.1644 0.0000 1.5960 ] [ Y' - 16 ] [ R'] */
/* [ 1.1644 -0.3918 -0.8130 ] * [ Cb - 128 ] = [ G'] */
/* [ 1.1644 2.0172 0.0000 ] [ Cr - 128 ] [ B'] */

// myrgb[r*720+c].r=(unsigned char)( 1.1644*(ytop[(r/2)*720+c]-16) + 1.5960*(Cr[(r/2)*720+c]-128));
// myrgb[r*720+c].g=(unsigned char)( 1.1644*(ytop[(r/2)*720+c]-16) - 0.3918*(Cb[(r/2)*720+c]-128) - 0.8130*(Cr[(r/2)*720+c]-128) );
// myrgb[r*720+c].b=(unsigned char)( 1.1644*(ytop[(r/2)*720+c]-16) + 2.0172*(Cb[(r/2)*720+c]-128) );

// myrgb[(r+1)*720+c].r=(unsigned char)( 1.1644*(ybottom[((r+1)/2)*720+c]-16) + 1.5960*(Cr[((r+1)/2)*720+c]-128));
// myrgb[(r+1)*720+c].g=(unsigned char)( 1.1644*(ybottom[((r+1)/2)*720+c]-16) - 0.3918*(Cb[((r+1)/2)*720+c]-128) - 0.8130*(Cr[((r+1)/2)*720+c]-128) );
// myrgb[(r+1)*720+c].b=(unsigned char)( 1.1644*(ybottom[((r+1)/2)*720+c]-16) + 2.0172*(Cb[((r+1)/2)*720+c]-128));


// myrgb[r*720+c].r=(unsigned char)( ytop[(r/2)*720+c] + 1.402*Cr[(r/2)*720+c]);
// myrgb[r*720+c].g=(unsigned char)( ytop[(r/2)*720+c] - 0.344*Cb[(r/2)*720+c] - 0.714*Cr[(r/2)*720+c] );
// myrgb[r*720+c].b=(unsigned char)( ytop[(r/2)*720+c] + 1.772*Cb[(r/2)*720+c] );

// myrgb[(r+1)*720+c].r=(unsigned char)( ybottom[((r+1)/2)*720+c] + 1.402*Cr[((r+1)/2)*720+c]);
// myrgb[(r+1)*720+c].g=(unsigned char)( ybottom[((r+1)/2)*720+c] - 0.344*Cb[((r+1)/2)*720+c] - 0.714*Cr[((r+1)/2)*720+c] );
// myrgb[(r+1)*720+c].b=(unsigned char)( ybottom[((r+1)/2)*720+c] + 1.772*Cb[((r+1)/2)*720+c] );

/*
Cint = (int)ytop[(r/2)*720+c] - 16;
// Dint = (int)((Cr[(r/2)*720+c]*1.403) + 0.5) - 128;
// Eint = (int)((Cb[(r/2)*720+c]*1.773) + 0.5) - 128;
Dint = (int)((Cr[(r/2)*720+c]) + 0.5) - 128;
Eint = (int)((Cb[(r/2)*720+c]) + 0.5) - 128;

redint=( 298*Cint + 409*Eint + 128)>>8;
greenint=( 298*Cint - 100*Dint - 208*Eint + 128 )>>8;
blueint=( 298*Cint + 516*Dint + 128)>>8;

myrgb[r*720+c].r=(unsigned char)redint;
myrgb[r*720+c].g=(unsigned char)greenint;
myrgb[r*720+c].b=(unsigned char)blueint;

Cint = (int)ybottom[((r+1)/2)*720+c] - 16;
redint=( 298*Cint + 409*Eint + 128)>>8;
greenint=( 298*Cint - 100*Dint - 208*Eint + 128 )>>8;
blueint=( 298*Cint + 516*Dint + 128)>>8;

myrgb[(r+1)*720+c].r=(unsigned char)redint;
myrgb[(r+1)*720+c].g=(unsigned char)greenint;
myrgb[(r+1)*720+c].b=(unsigned char)blueint;
*/


// BW
// myrgb[r*720+c].r=(unsigned char)( ytop[(r/2)*720+c]);
// myrgb[r*720+c].g=(unsigned char)( ytop[(r/2)*720+c]);
// myrgb[r*720+c].b=(unsigned char)( ytop[(r/2)*720+c]);

// myrgb[(r+1)*720+c].r=(unsigned char)( ybottom[((r+1)/2)*720+c]);
// myrgb[(r+1)*720+c].g=(unsigned char)( ybottom[((r+1)/2)*720+c]);
// myrgb[(r+1)*720+c].b=(unsigned char)( ybottom[((r+1)/2)*720+c]);