SDL supports audio control of up to 32 local CD-ROM drives at once.
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.)
Before you call any of the SDL CD-ROM functions, you must first call +"SDL_Init(SDL_INIT_CDROM)", which scans the system for +CD-ROM drives, and sets the program up for audio control. Check the +return code, which should be 0, to see if there +were any errors in starting up.
After you have initialized the library, you can find out how many drives +are available using the SDL_CDNumDrives() function. +The first drive listed is the system default CD-ROM drive. After you have +chosen a drive, and have opened it with SDL_CDOpen(), +you can check the status and start playing if there's a CD in the drive.
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 FRAMES_TO_MSF() macro.