Mercurial > sdl-ios-xcode

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>Chapter 11. CD-ROM</H1
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><DT
><B
>Table of Contents</B
></DT
><DT
><A
HREF="sdlcdnumdrives.html"
>SDL_CDNumDrives</A
>&nbsp;--&nbsp;Returns the number of CD-ROM drives on the system.</DT
><DT
><A
HREF="sdlcdname.html"
>SDL_CDName</A
>&nbsp;--&nbsp;Returns a human-readable, system-dependent identifier for the CD-ROM.</DT
><DT
><A
HREF="sdlcdopen.html"
>SDL_CDOpen</A
>&nbsp;--&nbsp;Opens a CD-ROM drive for access.</DT
><DT
><A
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>SDL_CDStatus</A
>&nbsp;--&nbsp;Returns the current status of the given drive.</DT
><DT
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>SDL_CDPlay</A
>&nbsp;--&nbsp;Play a CD</DT
><DT
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>SDL_CDPlayTracks</A
>&nbsp;--&nbsp;Play the given CD track(s)</DT
><DT
><A
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>SDL_CDPause</A
>&nbsp;--&nbsp;Pauses a CDROM</DT
><DT
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>SDL_CDResume</A
>&nbsp;--&nbsp;Resumes a CDROM</DT
><DT
><A
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>SDL_CDStop</A
>&nbsp;--&nbsp;Stops a CDROM</DT
><DT
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>SDL_CDEject</A
>&nbsp;--&nbsp;Ejects a CDROM</DT
><DT
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>SDL_CDClose</A
>&nbsp;--&nbsp;Closes a SDL_CD handle</DT
><DT
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>SDL_CD</A
>&nbsp;--&nbsp;CDROM Drive Information</DT
><DT
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>SDL_CDtrack</A
>&nbsp;--&nbsp;CD Track Information Structure</DT
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><P
>SDL supports audio control of up to 32 local CD-ROM drives at once.</P
><P
>You use this API to perform all the basic functions of a CD player,
including listing the tracks, playing, stopping, and ejecting the CD-ROM.
(Currently, multi-changer CD drives are not supported.)</P
><P
>Before you call any of the SDL CD-ROM functions, you must first call
"<TT
CLASS="FUNCTION"
>SDL_Init(SDL_INIT_CDROM)</TT
>", which scans the system for
CD-ROM drives, and sets the program up for audio control.  Check the
return code, which should be <SPAN
CLASS="RETURNVALUE"
>0</SPAN
>, to see if there
were any errors in starting up.</P
><P
>After you have initialized the library, you can find out how many drives
are available using the <TT
CLASS="FUNCTION"
>SDL_CDNumDrives()</TT
> function.
The first drive listed is the system default CD-ROM drive.  After you have
chosen a drive, and have opened it with <TT
CLASS="FUNCTION"
>SDL_CDOpen()</TT
>,
you can check the status and start playing if there's a CD in the drive.</P
><P
>A CD-ROM is organized into one or more tracks, each consisting of a certain
number of "frames".  Each frame is ~2K in size, and at normal playing speed,
a CD plays 75 frames per second.  SDL works with the number of frames on a
CD, but this can easily be converted to the more familiar minutes/seconds
format by using the <TT
CLASS="FUNCTION"
>FRAMES_TO_MSF()</TT
> macro.</P
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author	Ryan C. Gordon <icculus@icculus.org>
date	Mon, 12 Dec 2005 09:22:36 +0000
parents	355632dca928
children