CVS log for src/sys/dev/files.audio

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defflag AUDIO_DEBUG

Include sequencer code conditionally.  Fixes build for sparc and sparc64
(and anything else that has a midi but no sequencer).

Combine the midi and sequencer modules into a single midi_seq module
to avoid a circular dependency as noted in kern/56772.  Retain minimal
modules of the original names to accomodate auto-loading upon access
to the /dev/xxx nodes.

Merge changes from current as of 20200406

Pull up following revision(s) (requested by nia in ticket #657):

	sys/dev/files.audio: revision 1.13
	sys/dev/files.audio: revision 1.14
	sys/arch/amd64/conf/GENERIC: revision 1.559
	sys/arch/evbarm/conf/GENERIC: revision 1.71
	sys/arch/evbarm/conf/GENERIC64: revision 1.134
	sys/dev/audio/audiodef.h: revision 1.8

Set AUDIO_BLK_MS=4 - unlikely to cause significant overhead on non-m68k.

Several of us have been setting this in /etc/sysctl.conf for months, to
get better performance from applications that require synced audio, etc.
It's also mentioned as a good value with low overhead on most archs here:
href="https://mail-index.netbsd.org/tech-kern/2019/12/07/msg025830.html

We could probably go lower, but this is low enough to make most/all
software run well, removing frame drops. It's also low enough to get
emulators/mednafen to stop complaining in the console.

defopt AUDIO_BLK_MS

Follow amd64 and set AUDIO_BLK_MS=4 by default

defopt -> defparam (oops)

Sync with head.

defopt -> defparam (oops)

defopt AUDIO_BLK_MS

Sync with HEAD

Merge isaki-audio2 branch, the overhaul of audio subsystem.
- Interrupt-oriented system rather than thread-oriented.
- Improve stability, quality and performance.
- Split playback and record cleanly.  Improve halfduplex support.
- Many bugs are fixed including deadlocks, resource leaks, abuses, etc.
- Simplify audio filter mechanism.  The encoding/channels/frequency
  conversions are completely handled in the upper layer.  So the hard-
  ware driver only converts its hardware encoding (if necessary).
- audio_hw_if changes:
  - Obsoletes query_encoding and add query_format instead.
  - Obsoletes set_params and add set_format instead.
  - Remove drain, setfd, mappage.
  - The call sequences are changed.
- ioctl AUDIO_GETFD/SETFD, AUDIO_GETCHAN/SETCHAN are obsoleted.
- ioctl AUDIO_{QUERY,GET,SET}FORMAT are introduced.
- cleanup config attributes: au*conv and mulaw.
- All hardware drivers should follow it (I've done as much as possible).

Some file paths are changed:
- dev/audio.c         -> dev/audio/audio.c (rewritten)
- dev/audiovar.h      -> dev/audio/audiovar.h
- dev/audio_dai.h     -> dev/audio/audio_dai.h
- dev/audio_if.h      -> dev/audio/audio_if.h
- dev/audiobell.c     -> dev/audio/audiobell.c
- dev/audiobellvar.h  -> dev/audio/audiobellvar.h
- dev/mulaw.[ch]      -> dev/audio/mulaw.[ch] + dev/audio/alaw.c

Move dev/audiobell* -> dev/audio/audiobell*.

Remove dev/auconv.[ch].
 Now it is handled in dev/audio/audio.c and dev/audio/linear.c.
Remove dev/mulaw.h.
 It already have been just a link to dev/audio/mulaw.h in this
 branch.

Reimplement audio subsystem.
http://mail-index.netbsd.org/tech-kern/2019/04/01/msg024944.html
At first step, audio and devices tightly coupled to audio.
 audio.c -> dev/audio.c: completely rewritten.
 mulaw.c -> audio/mulaw.c, audio/alaw.c: improve quality.
 audiovar.h, mulaw.h: should be removed.
 audio/linear.c: efficient new linear-linear converter.
 auconv.[ch]: should be removed but need some functions for now.
 aurateconv, auvolconv: removed (new audio.c handles it).
 audiobell.c: efficient and small new bell driver.
 audiobelldata.h: removed 4KB sine wave data.
 pad/pad.c: catch up audio, but not cloneable for now.

update from HEAD

Sync with HEAD

file files.audio was added on branch tls-maxphys on 2017-12-03 11:36:58 +0000

Include auvolconv.o in the audio driver, even if there are currently no
children needing it.  Children which need this can be created later (via
loading of a module, such as pad).

Sync with HEAD

Sync with HEAD.  (Note that most of these changes are simply $NetBSD$
tag issues.)

Add mulaw to audio device for auconv_set_converter.

This should address PR kern/51707.

name attachment after parent per existing convention.

Restructure speaker devices so that there can be multiple of them, and have
proper softc's.

one more vaudiospeaker remove

more spkr rework.

Add a synthesized pc beeper and keyboard bell for platforms with an audio
device.

The audio sub-system now supports the following features as
posted to tech-kern:

    * Simultaneous playback and mixing of multiple streams
    * Playback streams can be of different encoding, frequency, precision
      and number of channels
    * Simultaneous recording to different formats
    * One audio device per process
    * Sysctls to set the common format frequency, precision and channels
    * Independent mixer controls for recording/playback per stream
    * Utilizes little cpu time for multiple streams / good performance
    * Compatible with existing programs that use OSS/NetBSD audio
    * Changes to audioctl(1) to allow specifying process id for corresponding
      audio device

Add common audio converters for software volume control. Only supports
slinear16_le and slinear16_be for now.

Convert pad(4) to use the new converters.

Normalize audio related definitions.

Move audio related definitions.