CDIO(7I) Ioctl Requests CDIO(7I)

NAME


cdio - CD-ROM control operations

SYNOPSIS


#include <sys/cdio.h>

DESCRIPTION


The set of ioctl(2) commands described below are used to perform audio and
CD-ROM specific operations. Basic to these cdio ioctl requests are the
definitions in <sys/cdio.h>.

Several CD-ROM specific commands can report addresses either in LBA
(Logical Block Address) format or in MSF (Minute, Second, Frame) format.
The READ HEADER, BREAD SUBCHANNEL, and BREAD TABLE OF CONTENTS commands
have this feature.

LBA format represents the logical block address for the CD-ROM absolute
address field or for the offset from the beginning of the current track
expressed as a number of logical blocks in a CD-ROM track relative address
field. MSF format represents the physical address written on CD-ROM discs,
expressed as a sector count relative to either the beginning of the medium
or the beginning of the current track.

IOCTLS


The following I/O controls do not have any additional data passed into or
received from them.

CDROMSTART This ioctl(2) spins up the disc and seeks to the last
address requested.

CDROMSTOP This ioctl(2) spins down the disc.

CDROMPAUSE This ioctl(2) pauses the current audio play operation.

CDROMRESUME This ioctl(2) resumes the paused audio play operation.

CDROMEJECT This ioctl(2) ejects the caddy with the disc.

CDROMCLOSETRAY This ioctl(2) closes the caddy with the disc.

The following I/O controls require a pointer to the structure for that
ioctl(2), with data being passed into the ioctl(2).

CDROMPLAYMSF This ioctl(2) command requests the drive to output the
audio signals at the specified starting address and
continue the audio play until the specified ending address
is detected. The address is in MSF format. The third
argument of this ioctl(2) call is a pointer to the type
struct cdrom_msf.

/*
* definition of play audio msf structure
*/
struct cdrom_msf {
/* starting minute */
unsigned char cdmsf_min0;
/* starting second */
unsigned char cdmsf_sec0;
/* starting frame */
unsigned char cdmsf_frame0;
/* ending minute */
unsigned char cdmsf_min1;
/* ending second */
unsigned char cdmsf_sec1;
/* ending frame */
unsigned char cdmsf_frame1;
};

The CDROMREADTOCENTRY ioctl request may be used to obtain
the start time for a track. An approximation of the
finish time can be obtained by using the CDROMREADTOCENTRY
ioctl request to retrieve the start time of the track
following the current track.

The leadout track is the next consecutive track after the
last audio track. Hence, the start time of the leadout
track may be used as the effective finish time of the
last audio track.

CDROMPLAYTRKIND This ioctl(2) command is similar to CDROMPLAYMSF. The
starting and ending address is in track/index format. The
third argument of the ioctl(2) call is a pointer to the
type struct cdrom_ti.

/*
* definition of play audio track/index structure
*/
struct cdrom_ti {
/* starting track */
unsigned char cdti_trk0;
/* starting index */
unsigned char cdti_ind0;
/* ending track */
unsigned char cdti_trk1;
/* ending index */
unsigned char cdti_ind1;
};

CDROMVOLCTRL This ioctl(2) command controls the audio output level.
The SCSI command allows the control of up to four
channels. The current implementation of the supported
CD-ROM drive only uses channel 0 and channel 1. The valid
values of volume control are between 0x00 and 0xFF, with a
value of 0xFF indicating maximum volume. The third
argument of the ioctl(2) call is a pointer to struct
cdrom_volctrl which contains the output volume values.

/*
* definition of audio volume control structure
*/
struct cdrom_volctrl {
unsigned char channel0;
unsigned char channel1;
unsigned char channel2;
unsigned char channel3;
};

The following I/O controls take a pointer that will have data returned to
the user program from the CD-ROM driver.

CDROMREADTOCHDR This ioctl(2) command returns the header of the table of
contents (TOC). The header consists of the starting track
number and the ending track number of the disc. These two
numbers are returned through a pointer of struct
cdrom_tochdr. While the disc can start at any number, all
tracks between the first and last tracks are in contiguous
ascending order.

/*
* definition of read toc header structure
*/
struct cdrom_tochdr {
unsigned char cdth_trk0; /* starting track */
unsigned char cdth_trk1; /* ending track */
};

CDROMREADTOCENTRY
This ioctl(2) command returns the information of a
specified track. The third argument of the function call
is a pointer to the type struct cdrom_tocentry. The
caller needs to supply the track number and the address
format. This command will return a 4-bit adr field, a
4-bit ctrl field, the starting address in MSF format or
LBA format, and the data mode if the track is a data
track. The ctrl field specifies whether the track is data
or audio.

/*
* definition of read toc entry structure
*/
struct cdrom_tocentry {
unsigned char cdte_track;
unsigned char cdte_adr :4;
unsigned char cdte_ctrl :4;
unsigned char cdte_format;
union {
struct {
unsigned char minute;
unsigned char second;
unsigned char frame;
} msf;
int lba;
} cdte_addr;
unsigned char cdte_datamode;
};

To get the information from the leadout track, the
following value is appropriate for the cdte_track field:

CDROM_LEADOUT Leadout track

To get the information from the data track, the following
value is appropriate for the cdte_ctrl field:

CDROM_DATA_TRACK Data track

The following values are appropriate for the cdte_format
field:

CDROM_LBA LBA format

CDROM_MSF MSF format

CDROMSUBCHNL This ioctl(2) command reads the Q sub-channel data of the
current block. The subchannel data includes track number,
index number, absolute CD-ROM address, track relative
CD-ROM address, control data and audio status. All
information is returned through a pointer to struct
cdrom_subchnl. The caller needs to supply the address
format for the returned address.

struct cdrom_subchnl {
unsigned char cdsc_format;
unsigned char cdsc_audiostatus;
unsigned char cdsc_adr :4;
unsigned char cdsc_ctrl :4;
unsigned char cdsc_trk;
unsigned char cdsc_ind;
union {
struct {
unsigned char minute;
unsigned char second;
unsigned char frame;
} msf;
int lba;
} cdsc_absaddr;
union {
struct {
unsigned char minute;
unsigned char second;
unsigned char frame;
} msf;
int lba;
} cdsc_reladdr;
};

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 progress.

CDROM_AUDIO_PAUSED Audio play operation paused.

CDROM_AUDIO_COMPLETED Audio play successfully completed.

CDROM_AUDIO_ERROR Audio play stopped due to error.

CDROM_AUDIO_NO_STATUS No current audio status to return.

CDROMREADOFFSET This ioctl(2) 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(2) call is a
pointer to an int.

CDROMCDDA This ioctl(2) command returns the CD-DA data or the
subcode data. The third argument of the ioctl(2) 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 in terms of the number of blocks to be
transferred, and the subcode options. The caller also
needs to issue the CDROMREADTOCENTRY ioctl(2) to find out
which tracks contain CD-DA data before issuing this
ioctl(2).

/*
* Definition of CD-DA structure
*/
struct cdrom_cdda {
unsigned int cdda_addr;
unsigned int cdda_length;
caddr_t cdda_data;
unsigned char cdda_subcode;
};

cdda_addr signifies the starting logical block address.
cdda_length signifies the transfer length in blocks. The
length of the block depends on the cdda_subcode selection,
which is explained below. To get the subcode information
related to CD-DA data, the following 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.

To allocate the memory related to CD-DA and/or subcode
data, the following values are appropriate for each data
block transferred:

CD-DA data with no subcode 2352 bytes

CD-DA data with sub Q code 2368 bytes

CD-DA data with all subcode 2448 bytes

All subcode only 96 bytes

CDROMCDXA This ioctl(2) command returns the CD-ROM XA (CD-ROM
Extended Architecture) data according to CD-ROM XA format.
The third argument of the ioctl(2) call is a pointer to
the type struct cdrom_cdxa. In addition to allocating
memory and supplying its address, the caller needs to
supply the starting address of the data, the transfer
length in terms of number of blocks, and the format. The
caller also needs to issue the CDROMREADTOCENTRY ioctl(2)
to find out which tracks contain CD-ROM XA data before
issuing this ioctl(2).

/*
* Definition of CD-ROM XA structure
*/
struct cdrom_cdxa {
unsigned int cdxa_addr;
unsigned int cdxa_length;
caddr_t cdxa_data;
unsigned char cdxa_format;
};

To get the proper CD-ROM XA data, the following values are
appropriate for the cdxa_format field:

CDROM_XA_DATA CD-ROM XA data only

CDROM_XA_SECTOR_DATA CD-ROM XA all sector data

CDROM_XA_DATA_W_ERROR CD-ROM XA data with error flags
data

To allocate the memory related to CD-ROM XA format, the
following values are appropriate for each data block
transferred:

CD-ROM XA data only 2048 bytes

CD-ROM XA all sector data 2352 bytes

CD-ROM XA data with error flags data 2646 bytes

CDROMSUBCODE This ioctl(2) command returns raw subcode data (subcodes P
~ W are described in the "Red Book," see SEE ALSO) to the
initiator while the target is playing audio. The third
argument of the ioctl(2) call is a pointer to the type
struct cdrom_subcode. The caller needs to supply the
transfer length in terms of number of blocks and allocate
memory for subcode data. The memory allocated should be a
multiple of 96 bytes depending on the transfer length.

/*
* Definition of subcode structure
*/
struct cdrom_subcode {
unsigned int cdsc_length;
caddr_t cdsc_addr;
};

The next group of I/O controls get and set various CD-ROM drive parameters.

CDROMGBLKMODE This ioctl(2) command returns the current block size used
by the CD-ROM drive. The third argument of the ioctl(2)
call is a pointer to an integer.

CDROMSBLKMODE This ioctl(2) command requests the CD-ROM drive to change
from the current block size to the requested block size.
The third argument of the ioctl(2) call is an integer which
contains the requested block size. This ioctl(2) command
operates in exclusive-use mode only. The caller must
ensure that no other processes can operate on the same
CD-ROM device before issuing this ioctl(2). read(2)
behavior subsequent to this ioctl(2) remains the same: the
caller is still constrained to read the raw device on block
boundaries and in block multiples. To set the proper block
size, the following values are appropriate:

CDROM_BLK_512 512 bytes

CDROM_BLK_1024 1024 bytes

CDROM_BLK_2048 2048 bytes

CDROM_BLK_2056 2056 bytes

CDROM_BLK_2336 2336 bytes

CDROM_BLK_2340 2340 bytes

CDROM_BLK_2352 2352 bytes

CDROM_BLK_2368 2368 bytes

CDROM_BLK_2448 2448 bytes

CDROM_BLK_2646 2646 bytes

CDROM_BLK_2647 2647 bytes

CDROMGDRVSPEED This ioctl(2) command returns the current CD-ROM drive
speed. The third argument of the ioctl(2) call is a
pointer to an integer.

CDROMSDRVSPEED This ioctl(2) command requests the CD-ROM drive to change
the current drive speed to the requested drive speed. This
speed setting is only applicable when reading data areas.
The third argument of the ioctl(2) is an integer which
contains the requested drive speed. To set the CD-ROM
drive to the proper speed, the following values are
appropriate:

CDROM_NORMAL_SPEED 150k/second

CDROM_DOUBLE_SPEED 300k/second

CDROM_QUAD_SPEED 600k/second

CDROM_MAXIMUM_SPEED 300k/second (2x drive)

600k/second (4x drive)

Note that these numbers are only accurate when reading 2048
byte blocks. The CD-ROM drive will automatically switch to
normal speed when playing audio tracks and will switch back
to the speed setting when accessing data.

ARCHITECTURE


All

INTERFACE STABILITY


Uncommitted

SEE ALSO


ioctl(2), read(2), attributes(5)

System Description Compact Disc Digital Audio, N. V. Phillips, Sony
Corporation, ("Red Book").

System Description of Compact Disc Read Only Memory, N. V. Phillips, Sony
Corporation, ("Yellow Book").

System Description CD-ROM XA, N. V. Phillips, Microsoft, Sony Corporation,
1991.

Volume and File Structure of CD-ROM for Information Interchange, ISO
9660:1988(E).

SCSI-2 Standard, document X3T9.2/86-109.

SCSI Multimedia Commands, Version 2 (MMC-2).

NOTES


The CDROMCDDA, CDROMCDXA, CDROMSUBCODE, CDROMGDRVSPEED, CDROMSDRVSPEED, and
some of the block sizes in CDROMSBLKMODE are designed for new Sun-supported
CD-ROM drives and might not work on some of the older CD-ROM drives.

CDROMCDDA, CDROMCDXA, and CDROMSUBCODE will return error if the transfer
length exceeds valid limits as determined appropriate. Example: for MMC-2
drives, length can not exceed 3 bytes (i.e. 0xffffff). The same
restriction is enforced for older, pre-MMC-2 drives, as no limit was
published for these older drives (and 3 bytes is reasonable for all media).
Note that enforcing this limit does not imply that values passed in below
this limit will actually be applicable for each and every piece of media.

The interface to this device is preliminary and subject to change in future
releases. Programs should be written in a modular fashion so that future
changes can be easily incorporated.

OmniOS October 22, 2017 OmniOS