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Posted: **Sat Nov 26, 2005 12:47 am**

I've encountered a problem with cdRead(). When I try to read a non-existing sector, cdRead() returns 1 (OK) instead of 0 (error).

Example:

Code: Select all

void readtest&#40;&#41;
&#123;
	int ret;
	u8 buf&#91;2048&#93;;
	CdvdReadMode_t mode;

	memset&#40;buf, 0, sizeof&#40;buf&#41;&#41;;
	mode.retries = 10;
	mode.sectorType = CDVD_SECTOR_2048;
	mode.readSpeed = CDVD_SPIN_NORMAL;

	cdInit&#40;0&#41;;
	printf&#40;"Reading data from disc... "&#41;;
	ret = cdRead&#40;-1, 1, buf, &mode&#41;; // read the sector at LBA &#40;-1&#41;
	cdSync&#40;0&#41;; // blocking
	if &#40;!ret&#41; printf&#40;"Failed.\n"&#41;;
	else printf&#40;"OK.\n"&#41;;
&#125;

And the output is: "Reading data from disc... OK."
I don't know why it acts like that.

Also, does anybody know how to get the total number of sectors on a disc? I guess this information is stored in the TOC, but where?

Posted: **Sat Nov 26, 2005 1:21 am**

the TOC is a special area that cannot be read with the CdRead() function.

However, you can use the CdGetToc() function (seeing the function name, I don't think you need further information on it).

if you want some examples of usage, just check the sdk sources (audsrv for i.e.).

Posted: **Tue Dec 06, 2005 7:35 pm**

I know how to read the TOC, I just can't find any information on how it is organized?

Also, what is its exact size? In libcdvd.h it says:

Code: Select all

// get toc from inserted disc
// 
// args&#58;	buffer to hold toc &#40;1024 or 2064 bytes?&#41;
// returns&#58;	1 if successful
//			0 otherwise
s32  cdGetToc&#40;u8 *toc&#41;;

Any help would be appreciated.

forums.ps2dev.org

Problem with cdRead()

Problem with cdRead()