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Ariff Abdullah 90da2b2859 Sound Mega-commit. Expect further cleanup until code freeze. 
For a slightly thorough explaination, please refer to
	[1] http://people.freebsd.org/~ariff/SOUND_4.TXT.html .

Summary of changes includes:

1 Volume Per-Channel (vpc).  Provides private / standalone volume control
  unique per-stream pcm channel without touching master volume / pcm.
  Applications can directly use SNDCTL_DSP_[GET|SET][PLAY|REC]VOL, or for
  backwards compatibility, SOUND_MIXER_PCM through the opened dsp device
  instead of /dev/mixer.  Special "bypass" mode is enabled through
  /dev/mixer which will automatically detect if the adjustment is made
  through /dev/mixer and forward its request to this private volume
  controller.  Changes to this volume object will not interfere with
  other channels.

  Requirements:
    - SNDCTL_DSP_[GET|SET][PLAY|REC]_VOL are newer ioctls (OSSv4) which
      require specific application modifications (preferred).
    - No modifications required for using bypass mode, so applications
      like mplayer or xmms should work out of the box.

  Kernel hints:
    - hint.pcm.%d.vpc (0 = disable vpc).

  Kernel sysctls:
    - hw.snd.vpc_mixer_bypass (default: 1).  Enable or disable /dev/mixer
      bypass mode.
    - hw.snd.vpc_autoreset (default: 1).  By default, closing/opening
      /dev/dsp will reset the volume back to 0 db gain/attenuation.
      Setting this to 0 will preserve its settings across device
      closing/opening.
    - hw.snd.vpc_reset (default: 0).  Panic/reset button to reset all
      volume settings back to 0 db.
    - hw.snd.vpc_0db (default: 45).  0 db relative to linear mixer value.

2 High quality fixed-point Bandlimited SINC sampling rate converter,
  based on Julius O'Smith's Digital Audio Resampling -
  http://ccrma.stanford.edu/~jos/resample/.  It includes a filter design
  script written in awk (the clumsiest joke I've ever written)
    - 100% 32bit fixed-point, 64bit accumulator.
    - Possibly among the fastest (if not fastest) of its kind.
    - Resampling quality is tunable, either runtime or during kernel
      compilation (FEEDER_RATE_PRESETS).
    - Quality can be further customized during kernel compilation by
      defining FEEDER_RATE_PRESETS in /etc/make.conf.

  Kernel sysctls:
    - hw.snd.feeder_rate_quality.
      0 - Zero-order Hold (ZOH).  Fastest, bad quality.
      1 - Linear Interpolation (LINEAR).  Slightly slower than ZOH,
          better quality but still does not eliminate aliasing.
      2 - (and above) - Sinc Interpolation(SINC).  Best quality.  SINC
          quality always start from 2 and above.

  Rough quality comparisons:
    - http://people.freebsd.org/~ariff/z_comparison/

3 Bit-perfect mode.  Bypasses all feeder/dsp effects.  Pure sound will be
  directly fed into the hardware.

4 Parametric (compile time) Software Equalizer (Bass/Treble mixer). Can
  be customized by defining FEEDER_EQ_PRESETS in /etc/make.conf.

5 Transparent/Adaptive Virtual Channel. Now you don't have to disable
  vchans in order to make digital format pass through.  It also makes
  vchans more dynamic by choosing a better format/rate among all the
  concurrent streams, which means that dev.pcm.X.play.vchanformat/rate
  becomes sort of optional.

6 Exclusive Stream, with special open() mode O_EXCL.  This will "mute"
  other concurrent vchan streams and only allow a single channel with
  O_EXCL set to keep producing sound.

Other Changes:
    * most feeder_* stuffs are compilable in userland. Let's not
      speculate whether we should go all out for it (save that for
      FreeBSD 16.0-RELEASE).
    * kobj signature fixups, thanks to Andriy Gapon <avg@freebsd.org>
    * pull out channel mixing logic out of vchan.c and create its own
      feeder_mixer for world justice.
    * various refactoring here and there, for good or bad.
    * activation of few more OSSv4 ioctls() (see [1] above).
    * opt_snd.h for possible compile time configuration:
      (mostly for debugging purposes, don't try these at home)
        SND_DEBUG
        SND_DIAGNOSTIC
        SND_FEEDER_MULTIFORMAT
        SND_FEEDER_FULL_MULTIFORMAT
        SND_FEEDER_RATE_HP
        SND_PCM_64
        SND_OLDSTEREO

Manual page updates are on the way.

Tested by:	joel, Olivier SMEDTS <olivier at gid0 d org>, too many
          	unsung / unnamed heroes.
2009-06-07 19:12:08 +00:00
..
defines
files Sound Mega-commit. Expect further cleanup until code freeze. 2009-06-07 19:12:08 +00:00
files.amd64 Implement simple machine check support for amd64 and i386. 2009-05-13 17:53:04 +00:00
files.arm Switch to ath hal source code. Note this removes the ath_hal 2008-12-01 16:53:01 +00:00
files.i386 Migrate the Xen hypervisor clock reading routines into something 2009-05-29 13:36:06 +00:00
files.ia64 Add trivial implementation for the freebsd32_sysarch on ia64. 2009-04-01 19:23:07 +00:00
files.mips Add memmove() to the kernel, making the kernel compile with Clang. 2009-02-28 16:21:25 +00:00
files.pc98 MFi386: revision 192050 2009-05-14 16:01:29 +00:00
files.powerpc Initial version of the sec(4) driver for the integrated security engine found 2009-06-06 09:37:55 +00:00
files.sparc64 Add memmove() to the kernel, making the kernel compile with Clang. 2009-02-28 16:21:25 +00:00
files.sun4v Add memmove() to the kernel, making the kernel compile with Clang. 2009-02-28 16:21:25 +00:00
kern.mk Bump down the inline limit on MIPS. 2009-03-03 18:53:47 +00:00
kern.post.mk Always compute the root of the kernel source tree and explicitly pass it 2009-05-04 20:25:56 +00:00
kern.pre.mk Delete the old USB stack. The new stack has settled in and has all the 2009-05-27 16:16:56 +00:00
kmod.mk Change over the usb kernel options to the new stack (retaining existing 2009-02-23 18:34:56 +00:00
kmod_syms.awk
ldscript.amd64
ldscript.arm Create a non-elf pure binary version of the kernel as well. 2005-11-24 02:25:49 +00:00
ldscript.i386
ldscript.ia64
ldscript.mips Merge from p4: add Juniper license statement. 2008-09-19 03:36:37 +00:00
ldscript.mips.cfe Fix the CFE ldscript after the cutover to tradmips. 2008-10-13 06:07:58 +00:00
ldscript.powerpc Avoid hardcoding the kernel link address in the linker script. 2008-02-27 00:03:23 +00:00
ldscript.sparc64
Makefile.amd64 Add a kernel option for amd64 to compile with the frame on the stack 2008-05-23 03:52:55 +00:00
Makefile.arm Rename Marvell ARM CPU specific file according to r186933. 2009-01-09 10:55:33 +00:00
Makefile.i386 Revert config(8) version bump. It brings major pain for people working on 2007-05-16 17:23:54 +00:00
Makefile.ia64 Remove definition of the GCC3 variable. It was introduced in rev. 2007-06-02 21:30:39 +00:00
Makefile.mips Merge in the mips specific configuration files and such from the 2008-04-13 06:25:43 +00:00
Makefile.pc98 Revert config(8) version bump. It brings major pain for people working on 2007-05-16 17:23:54 +00:00
Makefile.powerpc Revert config(8) version bump. It brings major pain for people working on 2007-05-16 17:23:54 +00:00
Makefile.sparc64 Revert config(8) version bump. It brings major pain for people working on 2007-05-16 17:23:54 +00:00
Makefile.sun4v Revert config(8) version bump. It brings major pain for people working on 2007-05-16 17:23:54 +00:00
makeLINT.mk
makeLINT.sed
newvers.sh For kernel builds reduce the impact of svnversion, just scanning 2009-03-28 23:17:18 +00:00
NOTES - Rename IP_NONLOCALOK IP socket option to IP_BINDANY, to be more consistent 2009-06-01 10:30:00 +00:00
options Sound Mega-commit. Expect further cleanup until code freeze. 2009-06-07 19:12:08 +00:00
options.amd64 Merge in support for Xen HVM on amd64 architecture. 2009-03-11 15:30:12 +00:00
options.arm add IXP4XX_FLASH_SIZE config knob that can be used to override the default 2009-03-10 21:49:22 +00:00
options.i386 Fix AGP debugging code: 2009-02-06 20:57:10 +00:00
options.ia64 Don't forget to create opt_agp.h on ia64, which also uses agp(4). 2009-02-07 09:57:14 +00:00
options.mips Consistently use <TAB> instead of spaces as option name and file 2009-02-06 10:30:46 +00:00
options.pc98 Fix AGP debugging code: 2009-02-06 20:57:10 +00:00
options.powerpc Initial support for Freescale PowerQUICC III MPC85xx system-on-chip family. 2008-03-03 17:17:00 +00:00
options.sparc64 Add a driver for Schizo' Fireplane/Safari to PCI 2.1 and Tomatillo' 2008-09-28 00:07:05 +00:00
options.sun4v Remove remnants from the sparc64 origin of this file and which are 2007-01-19 12:22:50 +00:00
systags.sh Use a simpler way to reach the <machine> include dir, which should 2005-12-03 21:37:54 +00:00