a580b31a54
in every sense.
General
-------
- Multichannel safe, endian safe, format safe
* Large part of critical pcm filters such as vchan.c, feeder_rate.c,
feeder_volume.c, feeder_fmt.c and feeder.c has been rewritten so that
using them does not cause the pcm data to be converted to 16bit little
endian.
* Macrosses for accessing pcm data safely are defined within sound.h in
the form of PCM_READ_* / PCM_WRITE_*
* Currently, most of them are probably limited for mono/stereo handling,
but the future addition of true multichannel will be much easier.
- Low latency operation
* Well, this require lot more works to do not just within sound driver,
but we're heading towards right direction. Buffer/block sizing within
channel.c is rewritten to calculate precise allocation for various
combination of sample/data/rate size. As a result, applying correct
SNDCTL_DSP_POLICY value will achive expected latency behaviour simmilar
to what commercial 4front driver do.
* Signal handling fix. ctrl+c of "cat /dev/zero > /dev/dsp" does not
result long delay.
* Eliminate sound truncation if the sound data is too small.
DIY:
1) Download / extract
http://people.freebsd.org/~ariff/lowlatency/shortfiles.tar.gz
2) Do a comparison between "cat state*.au > /dev/dsp" and
"for x in state*.au ; do cat $x > /dev/dsp ; done"
- there should be no "perceivable" differences.
Double close for PR kern/31445.
CAVEAT: Low latency come with (unbearable) price especially for poorly
written applications. Applications that trying to act smarter
by requesting (wrong) blocksize/blockcount will suffer the most.
Fixup samples/patches can be found at:
http://people.freebsd.org/~ariff/ports/
- Switch minimum/maximum sampling rate limit to "1" and "2016000" (48k * 42)
due to closer compatibility with 4front driver.
Discussed with: marcus@ (long time ago?)
- All driver specific sysctls in the form of "hw.snd.pcm%d.*" have been
moved to their own dev sysctl nodes, notably:
hw.snd.pcm%d.vchans -> dev.pcm.%d.vchans
Bump __FreeBSD_version.
Driver specific
---------------
- Ditto for sysctls.
- snd_atiixp, snd_es137x, snd_via8233, snd_hda
* Numerous cleanups and fixes.
* _EXPERIMENTAL_ polling mode support using simple callout_* mechanisme.
This was intended for pure debugging and latency measurement, but proven
good enough in few unexpected and rare cases (such as problematic shared
IRQ with GIANT devices - USB). Polling can be enabled/disabled through
dev.pcm.0.polling. Disabled by default.
- snd_ich
* Fix possible overflow during speed calibration. Delay final
initialization (pcm_setstatus) after calibration finished.
PR: kern/100169
Tested by: Kevin Overman <oberman@es.net>
* Inverted EAPD for few Nec VersaPro.
PR: kern/104715
Submitted by: KAWATA Masahiko <kawata@mta.biglobe.ne.jp>
Thanks to various people, notably Joel Dahl, Yuriy Tsibizov, Kevin Oberman,
those at #freebsd-azalia @ freenode and others for testing.
Joel Dahl will do the manpage update.
112 lines
3.5 KiB
C
112 lines
3.5 KiB
C
/*-
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* Copyright (c) 1999 Cameron Grant <cg@freebsd.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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struct pcm_feederdesc {
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u_int32_t type;
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u_int32_t in, out;
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u_int32_t flags;
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int idx;
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};
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struct feeder_class {
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KOBJ_CLASS_FIELDS;
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int align;
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struct pcm_feederdesc *desc;
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void *data;
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};
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struct pcm_feeder {
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KOBJ_FIELDS;
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int align;
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struct pcm_feederdesc *desc, desc_static;
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void *data;
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struct feeder_class *class;
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struct pcm_feeder *source, *parent;
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};
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void feeder_register(void *p);
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struct feeder_class *feeder_getclass(struct pcm_feederdesc *desc);
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u_int32_t chn_fmtscore(u_int32_t fmt);
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u_int32_t chn_fmtbestbit(u_int32_t fmt, u_int32_t *fmts);
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u_int32_t chn_fmtbeststereo(u_int32_t fmt, u_int32_t *fmts);
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u_int32_t chn_fmtbest(u_int32_t fmt, u_int32_t *fmts);
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u_int32_t chn_fmtchain(struct pcm_channel *c, u_int32_t *to);
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int chn_addfeeder(struct pcm_channel *c, struct feeder_class *fc, struct pcm_feederdesc *desc);
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int chn_removefeeder(struct pcm_channel *c);
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struct pcm_feeder *chn_findfeeder(struct pcm_channel *c, u_int32_t type);
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void feeder_printchain(struct pcm_feeder *head);
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#define FEEDER_DECLARE(feeder, palign, pdata) \
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static struct feeder_class feeder ## _class = { \
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.name = #feeder, \
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.methods = feeder ## _methods, \
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.size = sizeof(struct pcm_feeder), \
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.align = palign, \
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.desc = feeder ## _desc, \
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.data = pdata, \
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}; \
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SYSINIT(feeder, SI_SUB_DRIVERS, SI_ORDER_ANY, feeder_register, &feeder ## _class);
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#define FEEDER_ROOT 1
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#define FEEDER_FMT 2
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#define FEEDER_MIXER 3
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#define FEEDER_RATE 4
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#define FEEDER_FILTER 5
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#define FEEDER_VOLUME 6
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#define FEEDER_LAST FEEDER_VOLUME
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#define FEEDRATE_SRC 1
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#define FEEDRATE_DST 2
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#define FEEDRATE_RATEMIN 1
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#define FEEDRATE_RATEMAX 2016000 /* 48000 * 42 */
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#define FEEDRATE_MIN 1
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#define FEEDRATE_MAX 0x7fffff /* sign 24bit ~ 8ghz ! */
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#define FEEDRATE_ROUNDHZ 25
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#define FEEDRATE_ROUNDHZ_MIN 0
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#define FEEDRATE_ROUNDHZ_MAX 500
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/*
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* Default buffer size for feeder processing.
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*
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* Big = less sndbuf_feed(), more memory usage.
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* Small = aggresive sndbuf_feed() (perhaps too much), less memory usage.
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*/
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#define FEEDBUFSZ 16384
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#define FEEDBUFSZ_MIN 2048
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#define FEEDBUFSZ_MAX 131072
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extern int feeder_rate_min;
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extern int feeder_rate_max;
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extern int feeder_rate_round;
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extern int feeder_buffersize;
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