Function details-2

8.2.2 CD drive

For opening and closing the tray in the <OPEN> and <NODISC> states, refer to Initializing the CD block (CDC_CdInit).

List

Title Function specifications

Function CD playback

Function Name [SR] CDC_CdPlay

No 2.1

Form

Sint32 CDC_CdPlay (CdcPly * ply)

input

ply: playback parameters

output

none

Function value

Returns an error code.

function

Plays the CD according to the specified playback parameters.
Music is played in the CD-DA area, and sector data is read in the CD-ROM area.
Do not play the gap / pause area at the boundary between the CD-ROM and the CD-DA.

caution

To play the CD-DA and actually output the audio, it is necessary to set SCSP separately. Refer to the SCSP manual for the setting method.

remarks

When playing a CD-DA, the mute is released 4 frames before the start position to prevent the beginning of the song.

example

(1) Frame address specification

Sint32 ret;
CdcPly plywk, * ply = & plywk; / * Definition of playback parameter variables * /
CDC_PLY_STYPE (ply) = CDC_PTYPE_FAD;
CDC_PLY_SFAD (ply) = fad; / * Start frame address * /
CDC_PLY_ETYPE (ply) = CDC_PTYPE_FAD;
CDC_PLY_EFAS (ply) = fasnum; / * Number of frame address sectors * /
CDC_PLY_PMODE (ply) = pmode; / * Playback mode * /
ret = CDC_CdPlay (ply); / * Start playback * /

(2) Track / index specification

CdcPly plywk, * ply = & plywk;
CDC_PLY_STYPE (ply) = CDC_PTYPE_TNO;
CDC_PLY_STNO (ply) = tno1; / * Start track number * /
CDC_PLY_SIDX (ply) = x1; / * Starting index number * /
CDC_PLY_ETYPE (ply) = CDC_PTYPE_TNO;
CDC_PLY_ETNO (ply) = tno2; / * End track number * /
CDC_PLY_EIDX (ply) = x2; / * End index number * /
CDC_PLY_PMODE (ply) = pmode; / * Playback mode * /
ret = CDC_CdPlay (ply);

(3) Specifying the default value

CdcPly plywk, * ply = & plywk;
CDC_PLY_STYPE (ply) = CDC_PTYPE_DFL; / * Start position is at the beginning of the disc * /
CDC_PLY_ETYPE (ply) = CDC_PTYPE_DFL; / * End position is at the end of the disc * /
CDC_PLY_PMODE (ply) = CDC_PM_DFL; / * No repeat, move pickup * /
ret = CDC_CdPlay (ply);

(4) Resume CD playback (unchanged specification: play from current position) …… Cancel pause

CdcPly plywk, * ply = & plywk;
CDC_PLY_STYPE (ply) = CDC_PTYPE_NOCHG;
CDC_PLY_ETYPE (ply) = CDC_PTYPE_NOCHG;
CDC_PLY_PMODE (ply) = CDC_PM_NOCHG;
ret = CDC_CdPlay (ply);

List

Title Function specifications

Function Seek playback position

Function Name [SR] CDC_CdSeek

No 2.2

Form

Sint32 CDC_CdSeek (CdcPos * pos)

input

pos: Positional parameters

output

none

Function value

Returns an error code.

function

Moves (seeks) the playback position (pickup) according to the specified position parameter.

caution

If you use the stop command at the end of CD playback, it will be slower when you access the CD again. As long as you continue to access the CD, you should usually use the pause command.

example

(1) Frame address specification

Sint32 ret;
CdcPos poswk, * pos = & poswk; / * Definition of position parameter variables * /
CDC_POS_PTYPE (pos) = CDC_PTYPE_FAD;
CDC_POS_FAD (pos) = fad; / * frame address * /
ret = CDC_CdSeek (pos); / * Start seek * /

(2) Track / index specification

CdcPos poswk, * pos = & poswk;
CDC_POS_PTYPE (pos) = CDC_PTYPE_TNO;
CDC_POS_TNO (pos) = tno; / * Track number * /
CDC_POS_IDX (pos) = x; / * Index number * /
ret = CDC_CdSeek (pos);

(3) Cancel CD playback (specify default value: seek to home position) …… Stop

CdcPos poswk, * pos = & poswk;
CDC_POS_PTYPE (pos) = CDC_PTYPE_DFL;
ret = CDC_CdSeek (pos);

(4) Pause CD playback (unchanged specification: seek to current position) …… Pause

CdcPos poswk, * pos = & poswk;
CDC_POS_PTYPE (pos) = CDC_PTYPE_NOCHG;
ret = CDC_CdSeek (pos);

List

Title Function specifications

Function Scan playback

Function Name [SR] CDC_CdScan

No 2.3

Form

Sint32 CDC_CdScan (Sint32 scandir)

input

scandir: Scan direction

output

none

Function value

Returns an error code.

function

Scan and play the CD. Continue scanning until a CD drive command (CD play, seek, etc.) is issued. When it reaches the outside of the playback range, the scan is canceled and the pose is set. The pose position at that time is indefinite.

(1) Scan direction

Constant name	explanation
CDC_SCAN_FWD	Fast forward playback (forward scan)
CDC_SCAN_RVS	Fast rewind playback (reverse scan)

(2) Audio output

When scanning and playing from the <PLAY> state, -12 dB of sound is output in the CD-DA area.
If you scan and play back in the CD-ROM area or in the <PAUSE> state, the sound will be muted.

remarks

When scanning and playing back the CD-ROM area, the sector data will not be read. If you try to reverse the scanning direction near the playback range boundary, you may go out of the playback range. When reversing, pay attention to the vicinity of the boundary (within 3 to 6 seconds).