[Bug 122524] New: kio_audiocd status update affects audio CD playback

[Ingo van Lil]

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http://bugs.kde.org/show_bug.cgi?id=122524         
           Summary: kio_audiocd status update affects audio CD playback
           Product: kdemultimedia
           Version: unspecified
          Platform: Compiled Sources
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
        AssignedTo: kde-multimedia kde org
        ReportedBy: inguin gmx de


Version:            (using KDE KDE 3.5.1DevelKDE 3.4.3)
Installed from:    Compiled From SourcesCompiled From SourcesGentoo Packages
Compiler:          gcc 3.3.6 
OS:                Linux

I noticed a pretty annoying bug when the KDE desktop device icons are enabled: Whenever I mount or unmount anything (no matter wheter I use the desktop icon or just enter the mount command in a terminal) while playing back an audio CD (which I do most of the time) the CD playback immediately skips to another track or even stops. I'm not using digital audio playback, I'm just sending a play command to the drive and let it do all the work.

I placed serveral debug messages into the kernel cdrom driver and did a lot of source code digging and I'm pretty sure I found the reason for this unusual behaviour: The kio_audiocd slaves calls cdda_open() from the cdparanoia library on any CD drive that contains an audio CD. cdda_open() reads several parameters for the given device and finally performs a single digital audio read (CDROMREADAUDIO ioctl in Linux) to make sure it can successfully use the device. Unfortunately this read operation causes rather unpleasant effect if the drive is already busy playing an audio CD.

I really wonder why nobody seems to have complained about this problem by now. Has everybody switched to digital playback already?