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><H1
><A
NAME="SDLCD"
>SDL_CD</A
></H1
><DIV
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><A
NAME="AEN7178"
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><H2
>Name</H2
>SDL_CD&nbsp;--&nbsp;CDROM Drive Information</DIV
><DIV
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><A
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><H2
>Structure Definition</H2
><PRE
CLASS="PROGRAMLISTING"
>typedef struct{
  int id;
  CDstatus status;
  int numtracks;
  int cur_track;
  int cur_frame;
  SDL_CDtrack track[SDL_MAX_TRACKS+1];
} SDL_CD;</PRE
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>Structure Data</H2
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><TT
CLASS="STRUCTFIELD"
><I
>id</I
></TT
></TD
><TD
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>Private drive identifier</TD
></TR
><TR
><TD
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><TT
CLASS="STRUCTFIELD"
><I
>status</I
></TT
></TD
><TD
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>Drive <A
HREF="sdlcdstatus.html"
>status</A
></TD
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><TT
CLASS="STRUCTFIELD"
><I
>numtracks</I
></TT
></TD
><TD
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>Number of tracks on the CD</TD
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><TR
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><TT
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><I
>cur_track</I
></TT
></TD
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>Current track</TD
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><TT
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><I
>cur_frame</I
></TT
></TD
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>Current frame offset within the track</TD
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><TR
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><TT
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><I
>track</I
></TT
>[SDL_MAX_TRACKS+1]</TD
><TD
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>Array of track descriptions. (see <A
HREF="sdlcdtrack.html"
><SPAN
CLASS="STRUCTNAME"
>SDL_CDtrack</SPAN
></A
>)</TD
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><H2
>Description</H2
><P
>An <SPAN
CLASS="STRUCTNAME"
>SDL_CD</SPAN
> structure is returned by <A
HREF="sdlcdopen.html"
><TT
CLASS="FUNCTION"
>SDL_CDOpen</TT
></A
>. It represents an opened CDROM device and stores information on the layout of the tracks on the disc.</P
><P
>A frame is the base data unit of a CD. <TT
CLASS="LITERAL"
>CD_FPS</TT
> frames is equal to 1 second of music. SDL provides two macros for converting between time and frames: <TT
CLASS="LITERAL"
>FRAMES_TO_MSF(f, M,S,F)</TT
> and <TT
CLASS="LITERAL"
>MSF_TO_FRAMES</TT
>.</P
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><H2
>Examples</H2
><PRE
CLASS="PROGRAMLISTING"
>int min, sec, frame;
int frame_offset;

FRAMES_TO_MSF(cdrom-&#62;cur_frame, &#38;min, &#38;sec, &#38;frame);
printf("Current Position: %d minutes, %d seconds, %d frames\n", min, sec, frame);

frame_offset=MSF_TO_FRAMES(min, sec, frame);</PRE
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><H2
>See Also</H2
><P
><A
HREF="sdlcdopen.html"
><TT
CLASS="FUNCTION"
>SDL_CDOpen</TT
></A
>,
<A
HREF="sdlcdtrack.html"
><SPAN
CLASS="STRUCTNAME"
>SDL_CDtrack</SPAN
></A
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author	Sam Lantinga <slouken@libsdl.org>
date	Thu, 07 Mar 2002 20:23:11 +0000
parents	e5bc29de3f0a
children	355632dca928