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LIBCDVD - does it work for DVD-ROM disks?

 
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ole



Joined: 08 May 2004
Posts: 92
Location: Czech Republic
PostPosted: Sat May 08, 2004 11:33 pm    Post subject: LIBCDVD - does it work for DVD-ROM disks? Reply with quote
I've tested the libcdvd 1.15 example program. It works, but only when CD-ROM is inserted. When the DVD-ROM (original of course, for example demo disk included in ps2 mag, or game) is inserted, the directory structure is empty (black screen, or the TOC is not cleared and the old directory strucutre remains on the screen). When some CD-ROM ps1 or ps2 disk is inserted then it works correctly.
The disk was changed by regular method - eject button (not the cog swap).
I'm using independence exploit on non-moded ps2 and naplink 1.1.
Any Idea how to access DVD-ROM using libcdvd on non moded machine?

Ole
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ole



Joined: 08 May 2004
Posts: 92
Location: Czech Republic
PostPosted: Sun May 09, 2004 8:29 pm    Post subject: Solved! Reply with quote
Found the reason of that malfunction.
TOC size and DIR size is not allways padded to 2048 bytes (sometimes is less) and it results in bad sector_size computation (CachedDirInfo.sector_num = CDVolDesc.rootToc.tocSize>>11; // gives a result 0).
This simlpification (>>11) gives incorrect sector size and is used in about 3 places in the cdvd_iop.c source code.
I changed this formula to something like that:

Code:
int getSectorCount(int dirSize) {
   int result = dirSize / 2048;
   if ((dirSize % 2048 ) > 0) {
      result++;
   }
   return result;
}

and finaly LIBCDVD works just fine with the DVD-ROMs.

Ole
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