cvs commit: src/sys/conf files src/sys/dev/sound/pcm buffer.c channel.c channel.h dsp.c dsp.h feeder.c mixer.c sndstat.c sound.c sound.h vchan.c vchan.h src/sys/dev/sound/usb uaudio.c src/sys/modules/sound/sound Makefile

[Ariff Abdullah]

ariff       2007-05-31 18:43:33 UTC

  FreeBSD src repository

  Modified files:
    sys/conf             files 
    sys/dev/sound/pcm    buffer.c channel.c channel.h dsp.c dsp.h 
                         feeder.c mixer.c sndstat.c sound.c 
                         sound.h vchan.c vchan.h 
    sys/dev/sound/usb    uaudio.c 
    sys/modules/sound/sound Makefile 
  Log:
  Last major commit and updates for RELENG_7:
  
  - Rework the entire pcm_channel structure:
    * Remove rarely used link placeholder, instead, make each pcm_channel
      as head/link of each own/each other. Unlock - Lock sequence due to
      sleep malloc has been reduced.
    * Implement "busy" queue which will contain list of busy/active
      channels. This greatly reduce locking contention for example while
      servicing interrupt for hardware with many channels or when virtual
      channels reach its 256 peak channels.
  
  - So I heard you like v chan ... O RLY?
    Welcome to Virtual **Record** Channels (vrec, rec vchans, vchans for
    recording, Rec-Chan, you decide), the ultimate solutions for your
    nagging O_RDWR full-duplex wannabe (note: flash plugins) monopolizing
    single record channel causing EBUSY.  Vrec works exactly like Vchans
    (or, should I rename it to "Vplay" :) , except that it operates on the
    opposite direction (recording). Up to 256 vrecs (like vchans) are
    possible.
  
    Notes:
     * Relocate dev.pcm.%d.{vchans,vchanformat,vchanrate} to each of its
       respective node/direction:
         dev.pcm.%d.play.* for "play"   (cdev = dsp%d.vp%d)
         dev.pcm.%d.rec.*  for "record" (cdev = dsp%d.vr%d)
     * Don't expect that it will magically give you ability to split
       "recording source" (eg: 1 channel for cdrom, 1 channel for mic,
       etc). Just admit that you only have a *single* recording source /
       channel. Please bug your hardware vendor instead :)
  
  - Bump maxautovchans from 4 to 16. For a full-fledged multimedia
    desktop/workstation with too many soundservers installed (esound,
    artsd, jackd, pulse/polypaudio, ding-dong pling plong mudkip fuh fuh,
    etc), 4 seems inadequate. There will be no memory penalty here, since
    virtual channels are allocate only by demand.
  
  - Nuke/Rework the entire statically created cdev entries. Everything is
    clonable through snd own clone manager which designed to withstand many
    kind of abusive devfs droids such as:
        * while : ; do /bin/test -e /dev/dsp ; done
        * jot 16777216 0 | while read x ; do ls /dev/dsp0.$x ; done
        * hundreds (could be thousands) concurrent threads/process opening
          "/dev/dsp" (previously, this might result EBUSY even with just
          3 contesting threads/procs).
    o Reusable clone objects (instead of creating new one like there's no
      tomorrow) after certain expiration deadline. The clone allocator will
      decide whether to reuse, share, or creating new clone.
    o Automatic garbage collector.
  
  - Dynamic unit magic allocator. Maximum attached soundcards can be tuned
    using tunable "hw.snd.maxunit" (Default to 512). Minimum is 16, and
    maximum is 2048.
  
  - ..other fixes, mostly related to concurrency issues.
  
  joel@ will do the manpage updates on sound(4).
  
  Have fun.
  
  Revision  Changes    Path
  1.1212    +2 -0      src/sys/conf/files
  1.35      +3 -3      src/sys/dev/sound/pcm/buffer.c
  1.118     +108 -35   src/sys/dev/sound/pcm/channel.c
  1.35      +85 -10    src/sys/dev/sound/pcm/channel.h
  1.103     +459 -187  src/sys/dev/sound/pcm/dsp.c
  1.12      +1 -0      src/sys/dev/sound/pcm/dsp.h
  1.41      +5 -3      src/sys/dev/sound/pcm/feeder.c
  1.59      +42 -25    src/sys/dev/sound/pcm/mixer.c
  1.26      +79 -33    src/sys/dev/sound/pcm/sndstat.c
  1.113     +596 -422  src/sys/dev/sound/pcm/sound.c
  1.77      +45 -39    src/sys/dev/sound/pcm/sound.h
  1.32      +362 -268  src/sys/dev/sound/pcm/vchan.c
  1.5       +20 -1     src/sys/dev/sound/pcm/vchan.h
  1.29      +5 -18     src/sys/dev/sound/usb/uaudio.c
  1.21      +3 -2      src/sys/modules/sound/sound/Makefile