On Fri, Jul 08, 2005 at 10:18:28AM -0700, Bruce Yang wrote: > Hi, All: > I am reading the driver code for Linux CD-ROM. In libcdaudio, it just > called ioctr with CDROMPLAYMSF to play the CD. I want to know : > 1) In Linux Kernel, in which file ioctl (audio_ioctl) is implemented? > scd_dev_ioo_io or others. See http://lxr.linux.no/ident?i=CDROMPLAYMSF > 2) How does a CD player play music? I means, what's the data flow from > physical CD to sound > card? Read music data from CD--> Send them to CD MIC--> Send them to Sound > Card or just > Read music data from CD--> Send them to Sound Card. The ioctl just asks the drive to play the CD. If you plug a headphone into the drive, you can hear the music. If the CD drive happens to be connected to the CD-in connection of a sound card, the sound card can pick up the music as well. Erik -- Erik Mouw J.A.K.Mouw@xxxxxxxxxxxxxx mouw@xxxxxxxxxxxx
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