Adaptec AHA-1520A Wartungshandbuch PDF herunterladen (Seite 61)

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SunOS 5.5 Ioctl Requests cdio(7I)

The following values are valid for the audio status ﬁeld returned

from READ SUBCHANNEL command:

CDROM_AUDIO_INVALID Audio status not supported

CDROM_AUDIO_PLAY Audio play operation in pro-

gress

CDROM_AUDIO_PAUSED Audio play operation paused

CDROM_AUDIO_COMPLETED Audio play successfully com-

pleted

CDROM_AUDIO_ERROR Audio play stopped due to error

CDROM_AUDIO_NO_STATUS No current audio status to

return

CDROMREADOFFSET

This ioctl() command returns the absolute CD-ROM address of the

ﬁrst track in the last session of a Multi-Session CD-ROM. The third

argument of the ioctl() call is a pointer to an int.

CDROMCDDA SPARC: This ioctl() command returns the CD-DA data or the sub-

code data. The third argument of the ioctl() call is a pointer to the

type struct cdrom_cdda. In addition to allocating memory and

supplying its address, the caller needs to supply the starting

address of the data, the transfer length, and the subcode options.

The caller also needs to issue the CDROMREADTOCENTRY ioctl()

to ﬁnd out which tracks containCD-DA data before issuingthis

ioctl().

/∗

∗ Deﬁnition of CD-DA structure

∗/

struct cdrom_cdda {

unsigned int cdda_addr;

unsigned int cdda_length;

caddr_t cdda_data;

unsigned char cdda_subcode;

};

To get the subcode information related toCD-DA data, the follow-

ing values are appropriate for the cdda_subcode ﬁeld:

CDROM_DA_NO_SUBCODE CD-DA data with no subcode

CDROM_DA_SUBQ CD-DA data with sub Q code

CDROM_DA_ALL_SUBCODE CD-DA data with all subcode

CDROM_DA_SUBCODE_ONLY All subcode only

modiﬁed 26 Jan 1995 7I-57

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