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cdio(7I) manual page Table of Contents

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 READ and READ 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() spins up the disc and seeks to the last address requested.

CDROMSTOP: This ioctl() spins down the disc.

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

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

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

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

CDROMPLAYMSF

This ioctl() 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() call is a pointer to the type struct cdrom_msf.

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

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

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

CDROMVOLCTRL: This ioctl() 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() 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() command returns the header of the table of contents (TOC ). The header consists of the starting tracking 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() 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 cdte_track the field:

CDROM_LEADOUT: Leadout track

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

CDROM_DATA_TRACK: Data track

The following values are appropriate for the cdte_adr field:

CDROM_LBA: LBA format

CDROM_MSF: MSF

format

CDROMSUBCHNL: This ioctl() 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 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() 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 subcode 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 contain CD-DA data before issuing this 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 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: SPARC: This ioctl() command returns the CD-ROM (CD-ROM Extended Architecture) data according to CD-ROM format. The third argument of the ioctl() 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, and the format. The caller also needs to issue the CDROMREADTOCENTRY ioctl() to find out which tracks contain CD-ROM data before issuing this ioctl().

/*
 * 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 data, the following values are appropriate for the cdxa_format field:

CDROM_XA_DATA

CD-ROM data only

CDROM_XA_SECTOR_DATA

CD-ROM all sector data

CDROM_XA_DATA_W_ERROR

CD-ROM data with error flags data

To allocate the memory related to CD-ROM 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: SPARC: This ioctl() 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() call is a pointer to the type struct cdrom_subcode. The caller needs to supply the transfer length 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: SPARC: This ioctl() command returns the current block size used by the CD-ROM drive. The third argument of the ioctl() call is a pointer to an integer.

CDROMSBLKMODE

SPARC: This ioctl() command requests the CD-ROM drive to change from the current block size to the requested block size. The third argument of the ioctl() call is an integer which contains the requested block size.

This ioctl() 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(). read(2) behavior subsequent to this ioctl() 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: SPARC: This ioctl() command returns the current CD-ROM drive speed. The third argument of the ioctl() call is a pointer to an integer.

CDROMSDRVSPEED: SPARC: This ioctl() 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() 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.

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.

The interface to this device is preliminary and subject to change in future releases. You are encouraged to write your programs in a modular fashion so that you can easily incorporate future changes.

Table of Contents

Name
Synopsis
Description
IOCTLs
See Also
Notes

Name

Synopsis

Description

IOCTLs

See Also

Notes