cvs commit: src/sys/sys param.h soundcard.h src/sys/dev/sound/pcm buffer.c buffer.h channel.c channel.h channel_if.m dsp.c dsp.h mixer.c mixer.h sound.c sound.h

Alexander Leidinger netchild at
Sat Sep 23 13:46:02 PDT 2006

netchild    2006-09-23 20:45:47 UTC

  FreeBSD src repository

  Modified files:
    sys/sys              soundcard.h param.h 
    sys/dev/sound/pcm    buffer.c buffer.h channel.c channel.h 
                         channel_if.m dsp.c dsp.h mixer.c mixer.h 
                         sound.c sound.h 
  MFp4 the sound Google Summer of Code project:
  The goal was to sync with the OSSv4 API 4Front Technologies uses in their
  proprietary OSS driver. This was successful as far as possible. The part
  of the API which is stable is implemented, for the rest there are some
  stubs already.
  New system ioctls:
   - SNDCTL_SYSINFO - obtain audio system info (version, # of audio/midi/
     mixer devices, etc.)
   - SNDCTL_AUDIOINFO - fetch details about a specific audio device
   - SNDCTL_MIXERINFO - fetch details about a specific mixer device
  New audio ioctls:
     triggered playback/recording on multiple devices (even across processes
     audio drivers for peak levels (needs driver support, disabled for now).
   - Per channel playback/recording levels -
     SNDCTL_DSP_{GET,SET}{PLAY,REC}VOL.  Note that these are still in name
     only, just wrapping around the AC97-style mixer at the moment. The next
     step is to push them down to the drivers.
  Audio ioctls still under development by 4Front (for which stubs may exist
  in this commit):
   - SNDCTL_MIX_ENUMINFO, SNDCTL_MIX_EXTINFO - (might be documented enough in
     the OSS releases to work on this.  These ioctls cover the cool "twiddle
     any knob on your card" features.)
   - SNDCTL_DSP_COOKEDMODE -- this ioctl is used to give applications direct
     access to a card's buffers, bypassing the feeder architecture.  It's
     a toughy -- "someone" needs to decide :
     (a) if this is desireable, and (b) if it's reasonably feasible.
  Updates for driver writers:
   So far, only two routines to the channel class (in channel_if.m) are added.
   One is for fetching a list of discrete supported playback/recording rates
   of a channel, and the other is for fetching peak level info (useful for
   drawing peak meters).  Interested parties may want to help pushing down
   SNDCTL_DSP_{GET,SET}{PLAY,REC}VOL into the drivers.
  To use the new stuff you need to rebuild the sound drivers or your kernel
  (depending on if you use modules or not) and to install soundcard.h (a
  buildworld/installworld handles this).
  Sponsored by:   Google SoC 2006
  Submitted by:   ryanb
  Many thanks to: 4Front Technologies for their cooperation, explanations
                  and the nice license of their soundcard.h.
  Revision  Changes    Path
  1.28      +125 -0    src/sys/dev/sound/pcm/buffer.c
  1.12      +8 -0      src/sys/dev/sound/pcm/buffer.h
  1.110     +154 -3    src/sys/dev/sound/pcm/channel.c
  1.33      +67 -0     src/sys/dev/sound/pcm/channel.h
  1.6       +64 -0     src/sys/dev/sound/pcm/channel_if.m
  1.96      +1162 -1   src/sys/dev/sound/pcm/dsp.c
  1.10      +6 -0      src/sys/dev/sound/pcm/dsp.h
  1.50      +335 -1    src/sys/dev/sound/pcm/mixer.c
  1.16      +9 -1      src/sys/dev/sound/pcm/mixer.h
  1.106     +137 -1    src/sys/dev/sound/pcm/sound.c
  1.71      +5 -0      src/sys/dev/sound/pcm/sound.h
  1.275     +1 -1      src/sys/sys/param.h
  1.46      +436 -3    src/sys/sys/soundcard.h

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