freebsd-skq/sys/dev/sound/pcm/sndstat.h
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

164 lines
5.6 KiB
C

/*-
* Copyright (c) 2007-2009 Ariff Abdullah <ariff@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#ifndef _SND_SNDSTAT_H_
#define _SND_SNDSTAT_H_
#define SNDSTAT_PREPARE_PCM_ARGS \
struct sbuf *s, device_t dev, int verbose
#define SNDSTAT_PREPARE_PCM_BEGIN() do { \
struct snddev_info *d; \
struct pcm_channel *c; \
struct pcm_feeder *f; \
\
if (verbose < 1) \
return (0); \
\
d = device_get_softc(dev); \
PCM_BUSYASSERT(d); \
\
if (CHN_EMPTY(d, channels.pcm)) { \
sbuf_printf(s, " (mixer only)"); \
return (0); \
} \
\
sbuf_printf(s, " (%dp:%dv/%dr:%dv channels %splex%s)", \
d->playcount, d->pvchancount, d->reccount, d->rvchancount, \
(d->flags & SD_F_SIMPLEX) ? "sim" : "du", \
(device_get_unit(dev) == snd_unit) ? " default" : "")
#define SNDSTAT_PREPARE_PCM_END() \
if (verbose <= 1) \
return (0); \
\
sbuf_printf(s, "\n\t"); \
sbuf_printf(s, "snddev flags=0x%b", d->flags, SD_F_BITS); \
\
CHN_FOREACH(c, d, channels.pcm) { \
\
KASSERT(c->bufhard != NULL && c->bufsoft != NULL, \
("hosed pcm channel setup")); \
\
sbuf_printf(s, "\n\t"); \
\
sbuf_printf(s, "%s[%s]: ", \
(c->parentchannel != NULL) ? \
c->parentchannel->name : "", c->name); \
sbuf_printf(s, "spd %d", c->speed); \
if (c->speed != sndbuf_getspd(c->bufhard)) \
sbuf_printf(s, "/%d", \
sndbuf_getspd(c->bufhard)); \
sbuf_printf(s, ", fmt 0x%08x", c->format); \
if (c->format != sndbuf_getfmt(c->bufhard)) \
sbuf_printf(s, "/0x%08x", \
sndbuf_getfmt(c->bufhard)); \
sbuf_printf(s, ", flags 0x%08x, 0x%08x", \
c->flags, c->feederflags); \
if (c->pid != -1) \
sbuf_printf(s, ", pid %d (%s)", \
c->pid, c->comm); \
sbuf_printf(s, "\n\t"); \
\
sbuf_printf(s, "interrupts %d, ", c->interrupts); \
\
if (c->direction == PCMDIR_REC) \
sbuf_printf(s, \
"overruns %d, feed %u, hfree %d, " \
"sfree %d [b:%d/%d/%d|bs:%d/%d/%d]", \
c->xruns, c->feedcount, \
sndbuf_getfree(c->bufhard), \
sndbuf_getfree(c->bufsoft), \
sndbuf_getsize(c->bufhard), \
sndbuf_getblksz(c->bufhard), \
sndbuf_getblkcnt(c->bufhard), \
sndbuf_getsize(c->bufsoft), \
sndbuf_getblksz(c->bufsoft), \
sndbuf_getblkcnt(c->bufsoft)); \
else \
sbuf_printf(s, \
"underruns %d, feed %u, ready %d " \
"[b:%d/%d/%d|bs:%d/%d/%d]", \
c->xruns, c->feedcount, \
sndbuf_getready(c->bufsoft), \
sndbuf_getsize(c->bufhard), \
sndbuf_getblksz(c->bufhard), \
sndbuf_getblkcnt(c->bufhard), \
sndbuf_getsize(c->bufsoft), \
sndbuf_getblksz(c->bufsoft), \
sndbuf_getblkcnt(c->bufsoft)); \
sbuf_printf(s, "\n\t"); \
\
sbuf_printf(s, "channel flags=0x%b", c->flags, \
CHN_F_BITS); \
sbuf_printf(s, "\n\t"); \
\
sbuf_printf(s, "{%s}", \
(c->direction == PCMDIR_REC) ? "hardware" : \
"userland"); \
sbuf_printf(s, " -> "); \
f = c->feeder; \
while (f->source != NULL) \
f = f->source; \
while (f != NULL) { \
sbuf_printf(s, "%s", f->class->name); \
if (f->desc->type == FEEDER_FORMAT) \
sbuf_printf(s, "(0x%08x -> 0x%08x)", \
f->desc->in, f->desc->out); \
else if (f->desc->type == FEEDER_MATRIX) \
sbuf_printf(s, "(%d.%d -> %d.%d)", \
AFMT_CHANNEL(f->desc->in) - \
AFMT_EXTCHANNEL(f->desc->in), \
AFMT_EXTCHANNEL(f->desc->in), \
AFMT_CHANNEL(f->desc->out) - \
AFMT_EXTCHANNEL(f->desc->out), \
AFMT_EXTCHANNEL(f->desc->out)); \
else if (f->desc->type == FEEDER_RATE) \
sbuf_printf(s, \
"(0x%08x q:%d %d -> %d)", \
f->desc->out, \
FEEDER_GET(f, FEEDRATE_QUALITY), \
FEEDER_GET(f, FEEDRATE_SRC), \
FEEDER_GET(f, FEEDRATE_DST)); \
else \
sbuf_printf(s, "(0x%08x)", \
f->desc->out); \
sbuf_printf(s, " -> "); \
f = f->parent; \
} \
sbuf_printf(s, "{%s}", \
(c->direction == PCMDIR_REC) ? "userland" : \
"hardware"); \
} \
\
return (0); \
} while (0)
#endif /* !_SND_SNDSTAT_H_ */