Function details-2

8.2.2 CD Drive

〈 OPEN〉 ,〈 NODISC〉 For information on opening and closing the tray in this state, see Initializing the CD Block ( CDC_CdInit ).

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Title function specification

Function CD playback

Function Name［SR］ CDC_CdPlay

No 2.1

Format

Sint32 CDC_CdPlay(CdcPly *ply)

input

ply: playback parameter

output

none

function value

Returns an error code.

function

Plays the CD according to the specified playback parameters.
The CD-DA area plays music, and the CD-ROM area reads sector data.
Do not play the gap/pause area at the boundary between CD-ROM and CD-DA.

Note

To play CD-DA and actually output audio, separate SCSP settings are required. Please refer to the SCSP manual for the setting method.

remarks

When playing a CD-DA, muting is canceled 4 frames before the start position to prevent the beginning of the song from being cut off.

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; /* Play mode */
ret = CDC_CdPlay(ply); /* Start playing */

(2) Track/index specification

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

(3) Specifying default values

CdcPly plywk, *ply=&plywk;
CDC_PLY_STYPE(ply)=CDC_PTYPE_DFL; /* Starting position is at the beginning of the disk */
CDC_PLY_ETYPE(ply)=CDC_PTYPE_DFL; /* End position is at the end of the disk */
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);

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Title function specification

Function Seek playback position

Function Name［SR］ CDC_CdSeek

No 2.2

Format

Sint32 CDC_CdSeek(CdcPos *pos)

input

pos: positional parameter

output

none

function value

Returns an error code.

function

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

Note

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

example

(1) Frame address specification

Sint32 ret;
CdcPos poswk, *pos=&poswk; /* Definition of positional parameter variable */
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) Stopping CD playback (default value: seek to home position)...stop

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

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

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

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Title function specification

Function scan playback

Function Name［SR］ CDC_CdScan

No 2.3

Format

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 outside the playback range, scanning is canceled and paused. The pose position at that time is undefined.

(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

〈 PLAY〉 If you perform scan playback from this state, -12dB of sound will be output in the CD-DA area.
CD-ROM area and〈 PAUSE〉 If you perform scan playback in this state, the audio will be muted.

remarks

When scanning and playing the CD-ROM area, sector data is not read. If you try to reverse the scan direction near the playback range boundary, you may end up outside the playback range. When reversing, be careful near the boundary (within 3 to 6 seconds).