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freebsd-nq/sys/dev/sound/pcm/channel.c
Ariff Abdullah bba4862c64 Last major commit and updates for RELENG_7: 
- Rework the entire pcm_channel structure:
  * Remove rarely used link placeholder, instead, make each pcm_channel
    as head/link of each own/each other. Unlock - Lock sequence due to
    sleep malloc has been reduced.
  * Implement "busy" queue which will contain list of busy/active
    channels. This greatly reduce locking contention for example while
    servicing interrupt for hardware with many channels or when virtual
    channels reach its 256 peak channels.

- So I heard you like v chan ... O RLY?
  Welcome to Virtual **Record** Channels (vrec, rec vchans, vchans for
  recording, Rec-Chan, you decide), the ultimate solutions for your
  nagging O_RDWR full-duplex wannabe (note: flash plugins) monopolizing
  single record channel causing EBUSY.  Vrec works exactly like Vchans
  (or, should I rename it to "Vplay" :) , except that it operates on the
  opposite direction (recording). Up to 256 vrecs (like vchans) are
  possible.

  Notes:
   * Relocate dev.pcm.%d.{vchans,vchanformat,vchanrate} to each of its
     respective node/direction:
       dev.pcm.%d.play.* for "play"   (cdev = dsp%d.vp%d)
       dev.pcm.%d.rec.*  for "record" (cdev = dsp%d.vr%d)
   * Don't expect that it will magically give you ability to split
     "recording source" (eg: 1 channel for cdrom, 1 channel for mic,
     etc). Just admit that you only have a *single* recording source /
     channel. Please bug your hardware vendor instead :)

- Bump maxautovchans from 4 to 16. For a full-fledged multimedia
  desktop/workstation with too many soundservers installed (esound,
  artsd, jackd, pulse/polypaudio, ding-dong pling plong mudkip fuh fuh,
  etc), 4 seems inadequate. There will be no memory penalty here, since
  virtual channels are allocate only by demand.

- Nuke/Rework the entire statically created cdev entries. Everything is
  clonable through snd own clone manager which designed to withstand many
  kind of abusive devfs droids such as:
      * while : ; do /bin/test -e /dev/dsp ; done
      * jot 16777216 0 | while read x ; do ls /dev/dsp0.$x ; done
      * hundreds (could be thousands) concurrent threads/process opening
	"/dev/dsp" (previously, this might result EBUSY even with just
	3 contesting threads/procs).
  o Reusable clone objects (instead of creating new one like there's no
    tomorrow) after certain expiration deadline. The clone allocator will
    decide whether to reuse, share, or creating new clone.
  o Automatic garbage collector.

- Dynamic unit magic allocator. Maximum attached soundcards can be tuned
  using tunable "hw.snd.maxunit" (Default to 512). Minimum is 16, and
  maximum is 2048.

- ..other fixes, mostly related to concurrency issues.

joel@ will do the manpage updates on sound(4).

Have fun.
2007-05-31 18:43:33 +00:00

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/*-
* Copyright (c) 1999 Cameron Grant <cg@freebsd.org>
* Portions Copyright by Luigi Rizzo - 1997-99
* 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.
*/
#include "opt_isa.h"
#include <dev/sound/pcm/sound.h>
#include "feeder_if.h"
SND_DECLARE_FILE("$FreeBSD$");
#define MIN_CHUNK_SIZE 256 /* for uiomove etc. */
#if 0
#define DMA_ALIGN_THRESHOLD 4
#define DMA_ALIGN_MASK (~(DMA_ALIGN_THRESHOLD - 1))
#endif
#define CHN_STARTED(c) ((c)->flags & CHN_F_TRIGGERED)
#define CHN_STOPPED(c) (!CHN_STARTED(c))
#define CHN_DIRSTR(c) (((c)->direction == PCMDIR_PLAY) ? \
"PCMDIR_PLAY" : "PCMDIR_REC")
#define BUF_PARENT(c, b) \
(((c) != NULL && (c)->parentchannel != NULL && \
(c)->parentchannel->bufhard != NULL) ? \
(c)->parentchannel->bufhard : (b))
#define CHN_TIMEOUT 5
#define CHN_TIMEOUT_MIN 1
#define CHN_TIMEOUT_MAX 10
/*
#define DEB(x) x
*/
int report_soft_formats = 1;
SYSCTL_INT(_hw_snd, OID_AUTO, report_soft_formats, CTLFLAG_RW,
&report_soft_formats, 1, "report software-emulated formats");
int chn_latency = CHN_LATENCY_DEFAULT;
TUNABLE_INT("hw.snd.latency", &chn_latency);
static int
sysctl_hw_snd_latency(SYSCTL_HANDLER_ARGS)
{
int err, val;
val = chn_latency;
err = sysctl_handle_int(oidp, &val, sizeof(val), req);
if (err != 0 || req->newptr == NULL)
return err;
if (val < CHN_LATENCY_MIN || val > CHN_LATENCY_MAX)
err = EINVAL;
else
chn_latency = val;
return err;
}
SYSCTL_PROC(_hw_snd, OID_AUTO, latency, CTLTYPE_INT | CTLFLAG_RW,
0, sizeof(int), sysctl_hw_snd_latency, "I",
"buffering latency (0=low ... 10=high)");
int chn_latency_profile = CHN_LATENCY_PROFILE_DEFAULT;
TUNABLE_INT("hw.snd.latency_profile", &chn_latency_profile);
static int
sysctl_hw_snd_latency_profile(SYSCTL_HANDLER_ARGS)
{
int err, val;
val = chn_latency_profile;
err = sysctl_handle_int(oidp, &val, sizeof(val), req);
if (err != 0 || req->newptr == NULL)
return err;
if (val < CHN_LATENCY_PROFILE_MIN || val > CHN_LATENCY_PROFILE_MAX)
err = EINVAL;
else
chn_latency_profile = val;
return err;
}
SYSCTL_PROC(_hw_snd, OID_AUTO, latency_profile, CTLTYPE_INT | CTLFLAG_RW,
0, sizeof(int), sysctl_hw_snd_latency_profile, "I",
"buffering latency profile (0=aggresive 1=safe)");
static int chn_timeout = CHN_TIMEOUT;
TUNABLE_INT("hw.snd.timeout", &chn_timeout);
#ifdef SND_DEBUG
static int
sysctl_hw_snd_timeout(SYSCTL_HANDLER_ARGS)
{
int err, val;
val = chn_timeout;
err = sysctl_handle_int(oidp, &val, sizeof(val), req);
if (err != 0 || req->newptr == NULL)
return err;
if (val < CHN_TIMEOUT_MIN || val > CHN_TIMEOUT_MAX)
err = EINVAL;
else
chn_timeout = val;
return err;
}
SYSCTL_PROC(_hw_snd, OID_AUTO, timeout, CTLTYPE_INT | CTLFLAG_RW,
0, sizeof(int), sysctl_hw_snd_timeout, "I",
"interrupt timeout (1 - 10) seconds");
#endif
static int chn_usefrags = 0;
TUNABLE_INT("hw.snd.usefrags", &chn_usefrags);
static int chn_syncdelay = -1;
TUNABLE_INT("hw.snd.syncdelay", &chn_syncdelay);
#ifdef SND_DEBUG
SYSCTL_INT(_hw_snd, OID_AUTO, usefrags, CTLFLAG_RW,
&chn_usefrags, 1, "prefer setfragments() over setblocksize()");
SYSCTL_INT(_hw_snd, OID_AUTO, syncdelay, CTLFLAG_RW,
&chn_syncdelay, 1,
"append (0-1000) millisecond trailing buffer delay on each sync");
#endif
/**
* @brief Channel sync group lock
*
* Clients should acquire this lock @b without holding any channel locks
* before touching syncgroups or the main syncgroup list.
*/
struct mtx snd_pcm_syncgroups_mtx;
MTX_SYSINIT(pcm_syncgroup, &snd_pcm_syncgroups_mtx, "PCM channel sync group lock", MTX_DEF);
/**
* @brief syncgroups' master list
*
* Each time a channel syncgroup is created, it's added to this list. This
* list should only be accessed with @sa snd_pcm_syncgroups_mtx held.
*
* See SNDCTL_DSP_SYNCGROUP for more information.
*/
struct pcm_synclist snd_pcm_syncgroups = SLIST_HEAD_INITIALIZER(head);
static int chn_buildfeeder(struct pcm_channel *c);
static void
chn_lockinit(struct pcm_channel *c, int dir)
{
switch(dir) {
case PCMDIR_PLAY:
c->lock = snd_mtxcreate(c->name, "pcm play channel");
break;
case PCMDIR_PLAY_VIRTUAL:
c->lock = snd_mtxcreate(c->name, "pcm virtual play channel");
break;
case PCMDIR_REC:
c->lock = snd_mtxcreate(c->name, "pcm record channel");
break;
case PCMDIR_REC_VIRTUAL:
c->lock = snd_mtxcreate(c->name, "pcm virtual record channel");
break;
case 0:
c->lock = snd_mtxcreate(c->name, "pcm fake channel");
break;
}
cv_init(&c->cv, c->name);
}
static void
chn_lockdestroy(struct pcm_channel *c)
{
snd_mtxfree(c->lock);
cv_destroy(&c->cv);
}
/**
* @brief Determine channel is ready for I/O
*
* @retval 1 = ready for I/O
* @retval 0 = not ready for I/O
*/
static int
chn_polltrigger(struct pcm_channel *c)
{
struct snd_dbuf *bs = c->bufsoft;
unsigned amt, lim;
CHN_LOCKASSERT(c);
if (c->flags & CHN_F_MAPPED) {
if (sndbuf_getprevblocks(bs) == 0)
return 1;
else
return (sndbuf_getblocks(bs) > sndbuf_getprevblocks(bs))? 1 : 0;
} else {
amt = (c->direction == PCMDIR_PLAY)? sndbuf_getfree(bs) : sndbuf_getready(bs);
#if 0
lim = (c->flags & CHN_F_HAS_SIZE)? sndbuf_getblksz(bs) : 1;
#endif
lim = c->lw;
return (amt >= lim) ? 1 : 0;
}
return 0;
}
static int
chn_pollreset(struct pcm_channel *c)
{
struct snd_dbuf *bs = c->bufsoft;
CHN_LOCKASSERT(c);
sndbuf_updateprevtotal(bs);
return 1;
}
static void
chn_wakeup(struct pcm_channel *c)
{
struct snd_dbuf *bs = c->bufsoft;
struct pcm_channel *ch;
CHN_LOCKASSERT(c);
if (CHN_EMPTY(c, children)) {
if (SEL_WAITING(sndbuf_getsel(bs)) && chn_polltrigger(c))
selwakeuppri(sndbuf_getsel(bs), PRIBIO);
} else if (CHN_EMPTY(c, children.busy)) {
CHN_FOREACH(ch, c, children) {
CHN_LOCK(ch);
chn_wakeup(ch);
CHN_UNLOCK(ch);
}
} else {
CHN_FOREACH(ch, c, children.busy) {
CHN_LOCK(ch);
chn_wakeup(ch);
CHN_UNLOCK(ch);
}
}
if (c->flags & CHN_F_SLEEPING)
wakeup_one(bs);
}
static int
chn_sleep(struct pcm_channel *c, char *str, int timeout)
{
struct snd_dbuf *bs = c->bufsoft;
int ret;
CHN_LOCKASSERT(c);
c->flags |= CHN_F_SLEEPING;
#ifdef USING_MUTEX
ret = msleep(bs, c->lock, PRIBIO | PCATCH, str, timeout);
#else
ret = tsleep(bs, PRIBIO | PCATCH, str, timeout);
#endif
c->flags &= ~CHN_F_SLEEPING;
return ret;
}
/*
* chn_dmaupdate() tracks the status of a dma transfer,
* updating pointers.
*/
static unsigned int
chn_dmaupdate(struct pcm_channel *c)
{
struct snd_dbuf *b = c->bufhard;
unsigned int delta, old, hwptr, amt;
KASSERT(sndbuf_getsize(b) > 0, ("bufsize == 0"));
CHN_LOCKASSERT(c);
old = sndbuf_gethwptr(b);
hwptr = chn_getptr(c);
delta = (sndbuf_getsize(b) + hwptr - old) % sndbuf_getsize(b);
sndbuf_sethwptr(b, hwptr);
DEB(
if (delta >= ((sndbuf_getsize(b) * 15) / 16)) {
if (!(c->flags & (CHN_F_CLOSING | CHN_F_ABORTING)))
device_printf(c->dev, "hwptr went backwards %d -> %d\n", old, hwptr);
}
);
if (c->direction == PCMDIR_PLAY) {
amt = min(delta, sndbuf_getready(b));
amt -= amt % sndbuf_getbps(b);
if (amt > 0)
sndbuf_dispose(b, NULL, amt);
} else {
amt = min(delta, sndbuf_getfree(b));
amt -= amt % sndbuf_getbps(b);
if (amt > 0)
sndbuf_acquire(b, NULL, amt);
}
if (snd_verbose > 3 && CHN_STARTED(c) && delta == 0) {
device_printf(c->dev, "WARNING: %s DMA completion "
"too fast/slow ! hwptr=%u, old=%u "
"delta=%u amt=%u ready=%u free=%u\n",
CHN_DIRSTR(c), hwptr, old, delta, amt,
sndbuf_getready(b), sndbuf_getfree(b));
}
return delta;
}
void
chn_wrupdate(struct pcm_channel *c)
{
int ret;
CHN_LOCKASSERT(c);
KASSERT(c->direction == PCMDIR_PLAY, ("chn_wrupdate on bad channel"));
if ((c->flags & (CHN_F_MAPPED | CHN_F_VIRTUAL)) || CHN_STOPPED(c))
return;
chn_dmaupdate(c);
ret = chn_wrfeed(c);
/* tell the driver we've updated the primary buffer */
chn_trigger(c, PCMTRIG_EMLDMAWR);
DEB(if (ret)
printf("chn_wrupdate: chn_wrfeed returned %d\n", ret);)
}
int
chn_wrfeed(struct pcm_channel *c)
{
struct snd_dbuf *b = c->bufhard;
struct snd_dbuf *bs = c->bufsoft;
unsigned int ret, amt;
CHN_LOCKASSERT(c);
#if 0
DEB(
if (c->flags & CHN_F_CLOSING) {
sndbuf_dump(b, "b", 0x02);
sndbuf_dump(bs, "bs", 0x02);
})
#endif
if ((c->flags & CHN_F_MAPPED) && !(c->flags & CHN_F_CLOSING))
sndbuf_acquire(bs, NULL, sndbuf_getfree(bs));
amt = sndbuf_getfree(b);
DEB(if (amt > sndbuf_getsize(bs) &&
sndbuf_getbps(bs) >= sndbuf_getbps(b)) {
printf("%s(%s): amt %d > source size %d, flags 0x%x", __func__, c->name,
amt, sndbuf_getsize(bs), c->flags);
});
ret = (amt > 0) ? sndbuf_feed(bs, b, c, c->feeder, amt) : ENOSPC;
/*
* Possible xruns. There should be no empty space left in buffer.
*/
if (sndbuf_getfree(b) > 0)
c->xruns++;
if (sndbuf_getfree(b) < amt)
chn_wakeup(c);
return ret;
}
static void
chn_wrintr(struct pcm_channel *c)
{
int ret;
CHN_LOCKASSERT(c);
/* update pointers in primary buffer */
chn_dmaupdate(c);
/* ...and feed from secondary to primary */
ret = chn_wrfeed(c);
/* tell the driver we've updated the primary buffer */
chn_trigger(c, PCMTRIG_EMLDMAWR);
DEB(if (ret)
printf("chn_wrintr: chn_wrfeed returned %d\n", ret);)
}
/*
* user write routine - uiomove data into secondary buffer, trigger if necessary
* if blocking, sleep, rinse and repeat.
*
* called externally, so must handle locking
*/
int
chn_write(struct pcm_channel *c, struct uio *buf)
{
struct snd_dbuf *bs = c->bufsoft;
void *off;
int ret, timeout, sz, t, p;
CHN_LOCKASSERT(c);
ret = 0;
timeout = chn_timeout * hz;
while (ret == 0 && buf->uio_resid > 0) {
sz = min(buf->uio_resid, sndbuf_getfree(bs));
if (sz > 0) {
/*
* The following assumes that the free space in
* the buffer can never be less around the
* unlock-uiomove-lock sequence.
*/
while (ret == 0 && sz > 0) {
p = sndbuf_getfreeptr(bs);
t = min(sz, sndbuf_getsize(bs) - p);
off = sndbuf_getbufofs(bs, p);
CHN_UNLOCK(c);
ret = uiomove(off, t, buf);
CHN_LOCK(c);
sz -= t;
sndbuf_acquire(bs, NULL, t);
}
ret = 0;
if (CHN_STOPPED(c))
chn_start(c, 0);
} else if (c->flags & (CHN_F_NBIO | CHN_F_NOTRIGGER)) {
/**
* @todo Evaluate whether EAGAIN is truly desirable.
* 4Front drivers behave like this, but I'm
* not sure if it at all violates the "write
* should be allowed to block" model.
*
* The idea is that, while set with CHN_F_NOTRIGGER,
* a channel isn't playing, *but* without this we
* end up with "interrupt timeout / channel dead".
*/
ret = EAGAIN;
} else {
ret = chn_sleep(c, "pcmwr", timeout);
if (ret == EAGAIN) {
ret = EINVAL;
c->flags |= CHN_F_DEAD;
printf("%s: play interrupt timeout, "
"channel dead\n", c->name);
} else if (ret == ERESTART || ret == EINTR)
c->flags |= CHN_F_ABORTING;
}
}
return ret;
}
#if 0
static int
chn_rddump(struct pcm_channel *c, unsigned int cnt)
{
struct snd_dbuf *b = c->bufhard;
CHN_LOCKASSERT(c);
#if 0
static u_int32_t kk = 0;
printf("%u: dumping %d bytes\n", ++kk, cnt);
#endif
c->xruns++;
sndbuf_setxrun(b, sndbuf_getxrun(b) + cnt);
return sndbuf_dispose(b, NULL, cnt);
}
#endif
/*
* Feed new data from the read buffer. Can be called in the bottom half.
*/
int
chn_rdfeed(struct pcm_channel *c)
{
struct snd_dbuf *b = c->bufhard;
struct snd_dbuf *bs = c->bufsoft;
unsigned int ret, amt;
CHN_LOCKASSERT(c);
DEB(
if (c->flags & CHN_F_CLOSING) {
sndbuf_dump(b, "b", 0x02);
sndbuf_dump(bs, "bs", 0x02);
})
#if 0
amt = sndbuf_getready(b);
if (sndbuf_getfree(bs) < amt) {
c->xruns++;
amt = sndbuf_getfree(bs);
}
#endif
amt = sndbuf_getfree(bs);
ret = (amt > 0) ? sndbuf_feed(b, bs, c, c->feeder, amt) : ENOSPC;
amt = sndbuf_getready(b);
if (amt > 0) {
c->xruns++;
sndbuf_dispose(b, NULL, amt);
}
if (sndbuf_getready(bs) > 0)
chn_wakeup(c);
return ret;
}
void
chn_rdupdate(struct pcm_channel *c)
{
int ret;
CHN_LOCKASSERT(c);
KASSERT(c->direction == PCMDIR_REC, ("chn_rdupdate on bad channel"));
if ((c->flags & (CHN_F_MAPPED | CHN_F_VIRTUAL)) || CHN_STOPPED(c))
return;
chn_trigger(c, PCMTRIG_EMLDMARD);
chn_dmaupdate(c);
ret = chn_rdfeed(c);
DEB(if (ret)
printf("chn_rdfeed: %d\n", ret);)
}
/* read interrupt routine. Must be called with interrupts blocked. */
static void
chn_rdintr(struct pcm_channel *c)
{
int ret;
CHN_LOCKASSERT(c);
/* tell the driver to update the primary buffer if non-dma */
chn_trigger(c, PCMTRIG_EMLDMARD);
/* update pointers in primary buffer */
chn_dmaupdate(c);
/* ...and feed from primary to secondary */
ret = chn_rdfeed(c);
}
/*
* user read routine - trigger if necessary, uiomove data from secondary buffer
* if blocking, sleep, rinse and repeat.
*
* called externally, so must handle locking
*/
int
chn_read(struct pcm_channel *c, struct uio *buf)
{
struct snd_dbuf *bs = c->bufsoft;
void *off;
int ret, timeout, sz, t, p;
CHN_LOCKASSERT(c);
if (CHN_STOPPED(c))
chn_start(c, 0);
ret = 0;
timeout = chn_timeout * hz;
while (ret == 0 && buf->uio_resid > 0) {
sz = min(buf->uio_resid, sndbuf_getready(bs));
if (sz > 0) {
/*
* The following assumes that the free space in
* the buffer can never be less around the
* unlock-uiomove-lock sequence.
*/
while (ret == 0 && sz > 0) {
p = sndbuf_getreadyptr(bs);
t = min(sz, sndbuf_getsize(bs) - p);
off = sndbuf_getbufofs(bs, p);
CHN_UNLOCK(c);
ret = uiomove(off, t, buf);
CHN_LOCK(c);
sz -= t;
sndbuf_dispose(bs, NULL, t);
}
ret = 0;
} else if (c->flags & (CHN_F_NBIO | CHN_F_NOTRIGGER))
ret = EAGAIN;
else {
ret = chn_sleep(c, "pcmrd", timeout);
if (ret == EAGAIN) {
ret = EINVAL;
c->flags |= CHN_F_DEAD;
printf("%s: record interrupt timeout, "
"channel dead\n", c->name);
} else if (ret == ERESTART || ret == EINTR)
c->flags |= CHN_F_ABORTING;
}
}
return ret;
}
void
chn_intr(struct pcm_channel *c)
{
CHN_LOCK(c);
c->interrupts++;
if (c->direction == PCMDIR_PLAY)
chn_wrintr(c);
else
chn_rdintr(c);
CHN_UNLOCK(c);
}
u_int32_t
chn_start(struct pcm_channel *c, int force)
{
u_int32_t i, j;
struct snd_dbuf *b = c->bufhard;
struct snd_dbuf *bs = c->bufsoft;
CHN_LOCKASSERT(c);
/* if we're running, or if we're prevented from triggering, bail */
if (CHN_STARTED(c) || ((c->flags & CHN_F_NOTRIGGER) && !force))
return EINVAL;
if (force) {
i = 1;
j = 0;
} else {
if (c->direction == PCMDIR_REC) {
i = sndbuf_getfree(bs);
j = (i > 0) ? 1 : sndbuf_getready(b);
} else {
if (sndbuf_getfree(bs) == 0) {
i = 1;
j = 0;
} else {
struct snd_dbuf *pb;
pb = BUF_PARENT(c, b);
i = sndbuf_xbytes(sndbuf_getready(bs), bs, pb);
j = sndbuf_getbps(pb);
}
}
if (snd_verbose > 3 && CHN_EMPTY(c, children))
printf("%s: %s (%s) threshold i=%d j=%d\n",
__func__, CHN_DIRSTR(c),
(c->flags & CHN_F_VIRTUAL) ? "virtual" : "hardware",
i, j);
}
if (i >= j) {
c->flags |= CHN_F_TRIGGERED;
sndbuf_setrun(b, 1);
c->feedcount = (c->flags & CHN_F_CLOSING) ? 2 : 0;
c->interrupts = 0;
c->xruns = 0;
if (c->direction == PCMDIR_PLAY && c->parentchannel == NULL) {
sndbuf_fillsilence(b);
if (snd_verbose > 3)
printf("%s: %s starting! (%s) (ready=%d "
"force=%d i=%d j=%d intrtimeout=%u "
"latency=%dms)\n",
__func__,
(c->flags & CHN_F_HAS_VCHAN) ?
"VCHAN" : "HW",
(c->flags & CHN_F_CLOSING) ? "closing" :
"running",
sndbuf_getready(b),
force, i, j, c->timeout,
(sndbuf_getsize(b) * 1000) /
(sndbuf_getbps(b) * sndbuf_getspd(b)));
}
chn_trigger(c, PCMTRIG_START);
return 0;
}
return 0;
}
void
chn_resetbuf(struct pcm_channel *c)
{
struct snd_dbuf *b = c->bufhard;
struct snd_dbuf *bs = c->bufsoft;
c->blocks = 0;
sndbuf_reset(b);
sndbuf_reset(bs);
}
/*
* chn_sync waits until the space in the given channel goes above
* a threshold. The threshold is checked against fl or rl respectively.
* Assume that the condition can become true, do not check here...
*/
int
chn_sync(struct pcm_channel *c, int threshold)
{
struct snd_dbuf *b, *bs;
int ret, count, hcount, minflush, resid, residp, syncdelay, blksz;
u_int32_t cflag;
CHN_LOCKASSERT(c);
bs = c->bufsoft;
if ((c->flags & (CHN_F_DEAD | CHN_F_ABORTING)) ||
(threshold < 1 && sndbuf_getready(bs) < 1))
return 0;
if (c->direction != PCMDIR_PLAY)
return EINVAL;
/* if we haven't yet started and nothing is buffered, else start*/
if (CHN_STOPPED(c)) {
if (threshold > 0 || sndbuf_getready(bs) > 0) {
ret = chn_start(c, 1);
if (ret)
return ret;
} else
return 0;
}
b = BUF_PARENT(c, c->bufhard);
minflush = threshold + sndbuf_xbytes(sndbuf_getready(b), b, bs);
syncdelay = chn_syncdelay;
if (syncdelay < 0 && (threshold > 0 || sndbuf_getready(bs) > 0))
minflush += sndbuf_xbytes(sndbuf_getsize(b), b, bs);
/*
* Append (0-1000) millisecond trailing buffer (if needed)
* for slower / high latency hardwares (notably USB audio)
* to avoid audible truncation.
*/
if (syncdelay > 0)
minflush += (sndbuf_getbps(bs) * sndbuf_getspd(bs) *
((syncdelay > 1000) ? 1000 : syncdelay)) / 1000;
minflush -= minflush % sndbuf_getbps(bs);
if (minflush > 0) {
threshold = min(minflush, sndbuf_getfree(bs));
sndbuf_clear(bs, threshold);
sndbuf_acquire(bs, NULL, threshold);
minflush -= threshold;
}
resid = sndbuf_getready(bs);
residp = resid;
blksz = sndbuf_getblksz(b);
if (blksz < 1) {
printf("%s: WARNING: blksz < 1 ! maxsize=%d [%d/%d/%d]\n",
__func__, sndbuf_getmaxsize(b), sndbuf_getsize(b),
sndbuf_getblksz(b), sndbuf_getblkcnt(b));
if (sndbuf_getblkcnt(b) > 0)
blksz = sndbuf_getsize(b) / sndbuf_getblkcnt(b);
if (blksz < 1)
blksz = 1;
}
count = sndbuf_xbytes(minflush + resid, bs, b) / blksz;
hcount = count;
ret = 0;
if (snd_verbose > 3)
printf("%s: [begin] timeout=%d count=%d "
"minflush=%d resid=%d\n", __func__, c->timeout, count,
minflush, resid);
cflag = c->flags & CHN_F_CLOSING;
c->flags |= CHN_F_CLOSING;
while (count > 0 && (resid > 0 || minflush > 0)) {
ret = chn_sleep(c, "pcmsyn", c->timeout);
if (ret == ERESTART || ret == EINTR) {
c->flags |= CHN_F_ABORTING;
break;
}
if (ret == 0 || ret == EAGAIN) {
resid = sndbuf_getready(bs);
if (resid == residp) {
--count;
if (snd_verbose > 3)
printf("%s: [stalled] timeout=%d "
"count=%d hcount=%d "
"resid=%d minflush=%d\n",
__func__, c->timeout, count,
hcount, resid, minflush);
} else if (resid < residp && count < hcount) {
++count;
if (snd_verbose > 3)
printf("%s: [resume] timeout=%d "
"count=%d hcount=%d "
"resid=%d minflush=%d\n",
__func__, c->timeout, count,
hcount, resid, minflush);
}
if (minflush > 0 && sndbuf_getfree(bs) > 0) {
threshold = min(minflush,
sndbuf_getfree(bs));
sndbuf_clear(bs, threshold);
sndbuf_acquire(bs, NULL, threshold);
resid = sndbuf_getready(bs);
minflush -= threshold;
}
residp = resid;
}
}
c->flags &= ~CHN_F_CLOSING;
c->flags |= cflag;
if (snd_verbose > 3)
printf("%s: timeout=%d count=%d hcount=%d resid=%d residp=%d "
"minflush=%d ret=%d\n",
__func__, c->timeout, count, hcount, resid, residp,
minflush, ret);
return 0;
}
/* called externally, handle locking */
int
chn_poll(struct pcm_channel *c, int ev, struct thread *td)
{
struct snd_dbuf *bs = c->bufsoft;
int ret;
CHN_LOCKASSERT(c);
if (!(c->flags & (CHN_F_MAPPED | CHN_F_TRIGGERED)))
chn_start(c, 1);
ret = 0;
if (chn_polltrigger(c) && chn_pollreset(c))
ret = ev;
else
selrecord(td, sndbuf_getsel(bs));
return ret;
}
/*
* chn_abort terminates a running dma transfer. it may sleep up to 200ms.
* it returns the number of bytes that have not been transferred.
*
* called from: dsp_close, dsp_ioctl, with channel locked
*/
int
chn_abort(struct pcm_channel *c)
{
int missing = 0;
struct snd_dbuf *b = c->bufhard;
struct snd_dbuf *bs = c->bufsoft;
CHN_LOCKASSERT(c);
if (CHN_STOPPED(c))
return 0;
c->flags |= CHN_F_ABORTING;
c->flags &= ~CHN_F_TRIGGERED;
/* kill the channel */
chn_trigger(c, PCMTRIG_ABORT);
sndbuf_setrun(b, 0);
if (!(c->flags & CHN_F_VIRTUAL))
chn_dmaupdate(c);
missing = sndbuf_getready(bs);
c->flags &= ~CHN_F_ABORTING;
return missing;
}
/*
* this routine tries to flush the dma transfer. It is called
* on a close of a playback channel.
* first, if there is data in the buffer, but the dma has not yet
* begun, we need to start it.
* next, we wait for the play buffer to drain
* finally, we stop the dma.
*
* called from: dsp_close, not valid for record channels.
*/
int
chn_flush(struct pcm_channel *c)
{
struct snd_dbuf *b = c->bufhard;
CHN_LOCKASSERT(c);
KASSERT(c->direction == PCMDIR_PLAY, ("chn_flush on bad channel"));
DEB(printf("chn_flush: c->flags 0x%08x\n", c->flags));
c->flags |= CHN_F_CLOSING;
chn_sync(c, 0);
c->flags &= ~CHN_F_TRIGGERED;
/* kill the channel */
chn_trigger(c, PCMTRIG_ABORT);
sndbuf_setrun(b, 0);
c->flags &= ~CHN_F_CLOSING;
return 0;
}
int
fmtvalid(u_int32_t fmt, u_int32_t *fmtlist)
{
int i;
for (i = 0; fmtlist[i]; i++)
if (fmt == fmtlist[i])
return 1;
return 0;
}
static struct afmtstr_table default_afmtstr_table[] = {
{ "alaw", AFMT_A_LAW }, { "mulaw", AFMT_MU_LAW },
{ "u8", AFMT_U8 }, { "s8", AFMT_S8 },
{ "s16le", AFMT_S16_LE }, { "s16be", AFMT_S16_BE },
{ "u16le", AFMT_U16_LE }, { "u16be", AFMT_U16_BE },
{ "s24le", AFMT_S24_LE }, { "s24be", AFMT_S24_BE },
{ "u24le", AFMT_U24_LE }, { "u24be", AFMT_U24_BE },
{ "s32le", AFMT_S32_LE }, { "s32be", AFMT_S32_BE },
{ "u32le", AFMT_U32_LE }, { "u32be", AFMT_U32_BE },
{ NULL, 0 },
};
int
afmtstr_swap_sign(char *s)
{
if (s == NULL || strlen(s) < 2) /* full length of "s8" */
return 0;
if (*s == 's')
*s = 'u';
else if (*s == 'u')
*s = 's';
else
return 0;
return 1;
}
int
afmtstr_swap_endian(char *s)
{
if (s == NULL || strlen(s) < 5) /* full length of "s16le" */
return 0;
if (s[3] == 'l')
s[3] = 'b';
else if (s[3] == 'b')
s[3] = 'l';
else
return 0;
return 1;
}
u_int32_t
afmtstr2afmt(struct afmtstr_table *tbl, const char *s, int stereo)
{
size_t fsz, sz;
sz = (s == NULL) ? 0 : strlen(s);
if (sz > 1) {
if (tbl == NULL)
tbl = default_afmtstr_table;
for (; tbl->fmtstr != NULL; tbl++) {
fsz = strlen(tbl->fmtstr);
if (sz < fsz)
continue;
if (strncmp(s, tbl->fmtstr, fsz) != 0)
continue;
if (fsz == sz)
return tbl->format |
((stereo) ? AFMT_STEREO : 0);
if ((sz - fsz) < 2 || s[fsz] != ':')
break;
/*
* For now, just handle mono/stereo.
*/
if ((s[fsz + 2] == '\0' && (s[fsz + 1] == 'm' ||
s[fsz + 1] == '1')) ||
strcmp(s + fsz + 1, "mono") == 0)
return tbl->format;
if ((s[fsz + 2] == '\0' && (s[fsz + 1] == 's' ||
s[fsz + 1] == '2')) ||
strcmp(s + fsz + 1, "stereo") == 0)
return tbl->format | AFMT_STEREO;
break;
}
}
return 0;
}
u_int32_t
afmt2afmtstr(struct afmtstr_table *tbl, u_int32_t afmt, char *dst,
size_t len, int type, int stereo)
{
u_int32_t fmt = 0;
char *fmtstr = NULL, *tag = "";
if (tbl == NULL)
tbl = default_afmtstr_table;
for (; tbl->format != 0; tbl++) {
if (tbl->format == 0)
break;
if ((afmt & ~AFMT_STEREO) != tbl->format)
continue;
fmt = afmt;
fmtstr = tbl->fmtstr;
break;
}
if (fmt != 0 && fmtstr != NULL && dst != NULL && len > 0) {
strlcpy(dst, fmtstr, len);
switch (type) {
case AFMTSTR_SIMPLE:
tag = (fmt & AFMT_STEREO) ? ":s" : ":m";
break;
case AFMTSTR_NUM:
tag = (fmt & AFMT_STEREO) ? ":2" : ":1";
break;
case AFMTSTR_FULL:
tag = (fmt & AFMT_STEREO) ? ":stereo" : ":mono";
break;
case AFMTSTR_NONE:
default:
break;
}
if (strlen(tag) > 0 && ((stereo && !(fmt & AFMT_STEREO)) || \
(!stereo && (fmt & AFMT_STEREO))))
strlcat(dst, tag, len);
}
return fmt;
}
int
chn_reset(struct pcm_channel *c, u_int32_t fmt)
{
int hwspd, r;
CHN_LOCKASSERT(c);
c->feedcount = 0;
c->flags &= CHN_F_RESET;
c->interrupts = 0;
c->timeout = 1;
c->xruns = 0;
r = CHANNEL_RESET(c->methods, c->devinfo);
if (fmt != 0) {
#if 0
hwspd = DSP_DEFAULT_SPEED;
/* only do this on a record channel until feederbuilder works */
if (c->direction == PCMDIR_REC)
RANGE(hwspd, chn_getcaps(c)->minspeed, chn_getcaps(c)->maxspeed);
c->speed = hwspd;
#endif
hwspd = chn_getcaps(c)->minspeed;
c->speed = hwspd;
if (r == 0)
r = chn_setformat(c, fmt);
if (r == 0)
r = chn_setspeed(c, hwspd);
#if 0
if (r == 0)
r = chn_setvolume(c, 100, 100);
#endif
}
if (r == 0)
r = chn_setlatency(c, chn_latency);
if (r == 0) {
chn_resetbuf(c);
r = CHANNEL_RESETDONE(c->methods, c->devinfo);
}
return r;
}
int
chn_init(struct pcm_channel *c, void *devinfo, int dir, int direction)
{
struct feeder_class *fc;
struct snd_dbuf *b, *bs;
int ret;
if (chn_timeout < CHN_TIMEOUT_MIN || chn_timeout > CHN_TIMEOUT_MAX)
chn_timeout = CHN_TIMEOUT;
chn_lockinit(c, dir);
b = NULL;
bs = NULL;
CHN_INIT(c, children);
CHN_INIT(c, children.busy);
c->devinfo = NULL;
c->feeder = NULL;
c->latency = -1;
c->timeout = 1;
ret = ENOMEM;
b = sndbuf_create(c->dev, c->name, "primary", c);
if (b == NULL)
goto out;
bs = sndbuf_create(c->dev, c->name, "secondary", c);
if (bs == NULL)
goto out;
CHN_LOCK(c);
ret = EINVAL;
fc = feeder_getclass(NULL);
if (fc == NULL)
goto out;
if (chn_addfeeder(c, fc, NULL))
goto out;
/*
* XXX - sndbuf_setup() & sndbuf_resize() expect to be called
* with the channel unlocked because they are also called
* from driver methods that don't know about locking
*/
CHN_UNLOCK(c);
sndbuf_setup(bs, NULL, 0);
CHN_LOCK(c);
c->bufhard = b;
c->bufsoft = bs;
c->flags = 0;
c->feederflags = 0;
c->sm = NULL;
ret = ENODEV;
CHN_UNLOCK(c); /* XXX - Unlock for CHANNEL_INIT() malloc() call */
c->devinfo = CHANNEL_INIT(c->methods, devinfo, b, c, direction);
CHN_LOCK(c);
if (c->devinfo == NULL)
goto out;
ret = ENOMEM;
if ((sndbuf_getsize(b) == 0) && ((c->flags & CHN_F_VIRTUAL) == 0))
goto out;
ret = chn_setdir(c, direction);
if (ret)
goto out;
ret = sndbuf_setfmt(b, AFMT_U8);
if (ret)
goto out;
ret = sndbuf_setfmt(bs, AFMT_U8);
if (ret)
goto out;
/**
* @todo Should this be moved somewhere else? The primary buffer
* is allocated by the driver or via DMA map setup, and tmpbuf
* seems to only come into existence in sndbuf_resize().
*/
if (c->direction == PCMDIR_PLAY) {
bs->sl = sndbuf_getmaxsize(bs);
bs->shadbuf = malloc(bs->sl, M_DEVBUF, M_NOWAIT);
if (bs->shadbuf == NULL) {
ret = ENOMEM;
goto out;
}
}
out:
CHN_UNLOCK(c);
if (ret) {
if (c->devinfo) {
if (CHANNEL_FREE(c->methods, c->devinfo))
sndbuf_free(b);
}
if (bs)
sndbuf_destroy(bs);
if (b)
sndbuf_destroy(b);
c->flags |= CHN_F_DEAD;
chn_lockdestroy(c);
return ret;
}
return 0;
}
int
chn_kill(struct pcm_channel *c)
{
struct snd_dbuf *b = c->bufhard;
struct snd_dbuf *bs = c->bufsoft;
if (CHN_STARTED(c)) {
CHN_LOCK(c);
chn_trigger(c, PCMTRIG_ABORT);
CHN_UNLOCK(c);
}
while (chn_removefeeder(c) == 0)
;
if (CHANNEL_FREE(c->methods, c->devinfo))
sndbuf_free(b);
c->flags |= CHN_F_DEAD;
sndbuf_destroy(bs);
sndbuf_destroy(b);
chn_lockdestroy(c);
return 0;
}
int
chn_setdir(struct pcm_channel *c, int dir)
{
#ifdef DEV_ISA
struct snd_dbuf *b = c->bufhard;
#endif
int r;
CHN_LOCKASSERT(c);
c->direction = dir;
r = CHANNEL_SETDIR(c->methods, c->devinfo, c->direction);
#ifdef DEV_ISA
if (!r && SND_DMA(b))
sndbuf_dmasetdir(b, c->direction);
#endif
return r;
}
int
chn_setvolume(struct pcm_channel *c, int left, int right)
{
CHN_LOCKASSERT(c);
/* should add a feeder for volume changing if channel returns -1 */
if (left > 100)
left = 100;
if (left < 0)
left = 0;
if (right > 100)
right = 100;
if (right < 0)
right = 0;
c->volume = left | (right << 8);
return 0;
}
static u_int32_t
round_pow2(u_int32_t v)
{
u_int32_t ret;
if (v < 2)
v = 2;
ret = 0;
while (v >> ret)
ret++;
ret = 1 << (ret - 1);
while (ret < v)
ret <<= 1;
return ret;
}
static u_int32_t
round_blksz(u_int32_t v, int round)
{
u_int32_t ret, tmp;
if (round < 1)
round = 1;
ret = min(round_pow2(v), CHN_2NDBUFMAXSIZE >> 1);
if (ret > v && (ret >> 1) > 0 && (ret >> 1) >= ((v * 3) >> 2))
ret >>= 1;
tmp = ret - (ret % round);
while (tmp < 16 || tmp < round) {
ret <<= 1;
tmp = ret - (ret % round);
}
return ret;
}
/*
* 4Front call it DSP Policy, while we call it "Latency Profile". The idea
* is to keep 2nd buffer short so that it doesn't cause long queue during
* buffer transfer.
*
* Latency reference table for 48khz stereo 16bit: (PLAY)
*
* +---------+------------+-----------+------------+
* | Latency | Blockcount | Blocksize | Buffersize |
* +---------+------------+-----------+------------+
* | 0 | 2 | 64 | 128 |
* +---------+------------+-----------+------------+
* | 1 | 4 | 128 | 512 |
* +---------+------------+-----------+------------+
* | 2 | 8 | 512 | 4096 |
* +---------+------------+-----------+------------+
* | 3 | 16 | 512 | 8192 |
* +---------+------------+-----------+------------+
* | 4 | 32 | 512 | 16384 |
* +---------+------------+-----------+------------+
* | 5 | 32 | 1024 | 32768 |
* +---------+------------+-----------+------------+
* | 6 | 16 | 2048 | 32768 |
* +---------+------------+-----------+------------+
* | 7 | 8 | 4096 | 32768 |
* +---------+------------+-----------+------------+
* | 8 | 4 | 8192 | 32768 |
* +---------+------------+-----------+------------+
* | 9 | 2 | 16384 | 32768 |
* +---------+------------+-----------+------------+
* | 10 | 2 | 32768 | 65536 |
* +---------+------------+-----------+------------+
*
* Recording need a different reference table. All we care is
* gobbling up everything within reasonable buffering threshold.
*
* Latency reference table for 48khz stereo 16bit: (REC)
*
* +---------+------------+-----------+------------+
* | Latency | Blockcount | Blocksize | Buffersize |
* +---------+------------+-----------+------------+
* | 0 | 512 | 32 | 16384 |
* +---------+------------+-----------+------------+
* | 1 | 256 | 64 | 16384 |
* +---------+------------+-----------+------------+
* | 2 | 128 | 128 | 16384 |
* +---------+------------+-----------+------------+
* | 3 | 64 | 256 | 16384 |
* +---------+------------+-----------+------------+
* | 4 | 32 | 512 | 16384 |
* +---------+------------+-----------+------------+
* | 5 | 32 | 1024 | 32768 |
* +---------+------------+-----------+------------+
* | 6 | 16 | 2048 | 32768 |
* +---------+------------+-----------+------------+
* | 7 | 8 | 4096 | 32768 |
* +---------+------------+-----------+------------+
* | 8 | 4 | 8192 | 32768 |
* +---------+------------+-----------+------------+
* | 9 | 2 | 16384 | 32768 |
* +---------+------------+-----------+------------+
* | 10 | 2 | 32768 | 65536 |
* +---------+------------+-----------+------------+
*
* Calculations for other data rate are entirely based on these reference
* tables. For normal operation, Latency 5 seems give the best, well
* balanced performance for typical workload. Anything below 5 will
* eat up CPU to keep up with increasing context switches because of
* shorter buffer space and usually require the application to handle it
* aggresively through possibly real time programming technique.
*
*/
#define CHN_LATENCY_PBLKCNT_REF \
{{1, 2, 3, 4, 5, 5, 4, 3, 2, 1, 1}, \
{1, 2, 3, 4, 5, 5, 4, 3, 2, 1, 1}}
#define CHN_LATENCY_PBUFSZ_REF \
{{7, 9, 12, 13, 14, 15, 15, 15, 15, 15, 16}, \
{11, 12, 13, 14, 15, 16, 16, 16, 16, 16, 17}}
#define CHN_LATENCY_RBLKCNT_REF \
{{9, 8, 7, 6, 5, 5, 4, 3, 2, 1, 1}, \
{9, 8, 7, 6, 5, 5, 4, 3, 2, 1, 1}}
#define CHN_LATENCY_RBUFSZ_REF \
{{14, 14, 14, 14, 14, 15, 15, 15, 15, 15, 16}, \
{15, 15, 15, 15, 15, 16, 16, 16, 16, 16, 17}}
#define CHN_LATENCY_DATA_REF 192000 /* 48khz stereo 16bit ~ 48000 x 2 x 2 */
static int
chn_calclatency(int dir, int latency, int bps, u_int32_t datarate,
u_int32_t max, int *rblksz, int *rblkcnt)
{
static int pblkcnts[CHN_LATENCY_PROFILE_MAX + 1][CHN_LATENCY_MAX + 1] =
CHN_LATENCY_PBLKCNT_REF;
static int pbufszs[CHN_LATENCY_PROFILE_MAX + 1][CHN_LATENCY_MAX + 1] =
CHN_LATENCY_PBUFSZ_REF;
static int rblkcnts[CHN_LATENCY_PROFILE_MAX + 1][CHN_LATENCY_MAX + 1] =
CHN_LATENCY_RBLKCNT_REF;
static int rbufszs[CHN_LATENCY_PROFILE_MAX + 1][CHN_LATENCY_MAX + 1] =
CHN_LATENCY_RBUFSZ_REF;
u_int32_t bufsz;
int lprofile, blksz, blkcnt;
if (latency < CHN_LATENCY_MIN || latency > CHN_LATENCY_MAX ||
bps < 1 || datarate < 1 ||
!(dir == PCMDIR_PLAY || dir == PCMDIR_REC)) {
if (rblksz != NULL)
*rblksz = CHN_2NDBUFMAXSIZE >> 1;
if (rblkcnt != NULL)
*rblkcnt = 2;
printf("%s: FAILED dir=%d latency=%d bps=%d "
"datarate=%u max=%u\n",
__func__, dir, latency, bps, datarate, max);
return CHN_2NDBUFMAXSIZE;
}
lprofile = chn_latency_profile;
if (dir == PCMDIR_PLAY) {
blkcnt = pblkcnts[lprofile][latency];
bufsz = pbufszs[lprofile][latency];
} else {
blkcnt = rblkcnts[lprofile][latency];
bufsz = rbufszs[lprofile][latency];
}
bufsz = round_pow2(snd_xbytes(1 << bufsz, CHN_LATENCY_DATA_REF,
datarate));
if (bufsz > max)
bufsz = max;
blksz = round_blksz(bufsz >> blkcnt, bps);
if (rblksz != NULL)
*rblksz = blksz;
if (rblkcnt != NULL)
*rblkcnt = 1 << blkcnt;
return blksz << blkcnt;
}
static int
chn_resizebuf(struct pcm_channel *c, int latency,
int blkcnt, int blksz)
{
struct snd_dbuf *b, *bs, *pb;
int sblksz, sblkcnt, hblksz, hblkcnt, limit = 1;
int ret;
CHN_LOCKASSERT(c);
if ((c->flags & (CHN_F_MAPPED | CHN_F_TRIGGERED)) ||
!(c->direction == PCMDIR_PLAY || c->direction == PCMDIR_REC))
return EINVAL;
if (latency == -1) {
c->latency = -1;
latency = chn_latency;
} else if (latency == -2) {
latency = c->latency;
if (latency < CHN_LATENCY_MIN || latency > CHN_LATENCY_MAX)
latency = chn_latency;
} else if (latency < CHN_LATENCY_MIN || latency > CHN_LATENCY_MAX)
return EINVAL;
else {
c->latency = latency;
limit = 0;
}
bs = c->bufsoft;
b = c->bufhard;
if (!(blksz == 0 || blkcnt == -1) &&
(blksz < 16 || blksz < sndbuf_getbps(bs) || blkcnt < 2 ||
(blksz * blkcnt) > CHN_2NDBUFMAXSIZE))
return EINVAL;
chn_calclatency(c->direction, latency, sndbuf_getbps(bs),
sndbuf_getbps(bs) * sndbuf_getspd(bs), CHN_2NDBUFMAXSIZE,
&sblksz, &sblkcnt);
if (blksz == 0 || blkcnt == -1) {
if (blkcnt == -1)
c->flags &= ~CHN_F_HAS_SIZE;
if (c->flags & CHN_F_HAS_SIZE) {
blksz = sndbuf_getblksz(bs);
blkcnt = sndbuf_getblkcnt(bs);
}
} else
c->flags |= CHN_F_HAS_SIZE;
if (c->flags & CHN_F_HAS_SIZE) {
/*
* The application has requested their own blksz/blkcnt.
* Just obey with it, and let them toast alone. We can
* clamp it to the nearest latency profile, but that would
* defeat the purpose of having custom control. The least
* we can do is round it to the nearest ^2 and align it.
*/
sblksz = round_blksz(blksz, sndbuf_getbps(bs));
sblkcnt = round_pow2(blkcnt);
limit = 0;
}
if (c->parentchannel != NULL) {
pb = BUF_PARENT(c, NULL);
CHN_UNLOCK(c);
chn_notify(c->parentchannel, CHN_N_BLOCKSIZE);
CHN_LOCK(c);
limit = (limit != 0 && pb != NULL) ?
sndbuf_xbytes(sndbuf_getsize(pb), pb, bs) : 0;
c->timeout = c->parentchannel->timeout;
} else {
hblkcnt = 2;
if (c->flags & CHN_F_HAS_SIZE) {
hblksz = round_blksz(sndbuf_xbytes(sblksz, bs, b),
sndbuf_getbps(b));
hblkcnt = round_pow2(sndbuf_getblkcnt(bs));
} else
chn_calclatency(c->direction, latency,
sndbuf_getbps(b),
sndbuf_getbps(b) * sndbuf_getspd(b),
CHN_2NDBUFMAXSIZE, &hblksz, &hblkcnt);
if ((hblksz << 1) > sndbuf_getmaxsize(b))
hblksz = round_blksz(sndbuf_getmaxsize(b) >> 1,
sndbuf_getbps(b));
while ((hblksz * hblkcnt) > sndbuf_getmaxsize(b)) {
if (hblkcnt < 4)
hblksz >>= 1;
else
hblkcnt >>= 1;
}
hblksz -= hblksz % sndbuf_getbps(b);
#if 0
hblksz = sndbuf_getmaxsize(b) >> 1;
hblksz -= hblksz % sndbuf_getbps(b);
hblkcnt = 2;
#endif
CHN_UNLOCK(c);
if (chn_usefrags == 0 ||
CHANNEL_SETFRAGMENTS(c->methods, c->devinfo,
hblksz, hblkcnt) < 1)
sndbuf_setblksz(b, CHANNEL_SETBLOCKSIZE(c->methods,
c->devinfo, hblksz));
CHN_LOCK(c);
if (!CHN_EMPTY(c, children)) {
sblksz = round_blksz(
sndbuf_xbytes(sndbuf_getsize(b) >> 1, b, bs),
sndbuf_getbps(bs));
sblkcnt = 2;
limit = 0;
} else if (limit != 0)
limit = sndbuf_xbytes(sndbuf_getsize(b), b, bs);
/*
* Interrupt timeout
*/
c->timeout = ((u_int64_t)hz * sndbuf_getsize(b)) /
((u_int64_t)sndbuf_getspd(b) * sndbuf_getbps(b));
if (c->timeout < 1)
c->timeout = 1;
}
if (limit > CHN_2NDBUFMAXSIZE)
limit = CHN_2NDBUFMAXSIZE;
#if 0
while (limit > 0 && (sblksz * sblkcnt) > limit) {
if (sblkcnt < 4)
break;
sblkcnt >>= 1;
}
#endif
while ((sblksz * sblkcnt) < limit)
sblkcnt <<= 1;
while ((sblksz * sblkcnt) > CHN_2NDBUFMAXSIZE) {
if (sblkcnt < 4)
sblksz >>= 1;
else
sblkcnt >>= 1;
}
sblksz -= sblksz % sndbuf_getbps(bs);
if (sndbuf_getblkcnt(bs) != sblkcnt || sndbuf_getblksz(bs) != sblksz ||
sndbuf_getsize(bs) != (sblkcnt * sblksz)) {
ret = sndbuf_remalloc(bs, sblkcnt, sblksz);
if (ret != 0) {
printf("%s: Failed: %d %d\n", __func__,
sblkcnt, sblksz);
return ret;
}
}
/*
* OSSv4 docs: "By default OSS will set the low water level equal
* to the fragment size which is optimal in most cases."
*/
c->lw = sndbuf_getblksz(bs);
chn_resetbuf(c);
if (snd_verbose > 3)
printf("%s: %s (%s) timeout=%u "
"b[%d/%d/%d] bs[%d/%d/%d] limit=%d\n",
__func__, CHN_DIRSTR(c),
(c->flags & CHN_F_VIRTUAL) ? "virtual" : "hardware",
c->timeout,
sndbuf_getsize(b), sndbuf_getblksz(b),
sndbuf_getblkcnt(b),
sndbuf_getsize(bs), sndbuf_getblksz(bs),
sndbuf_getblkcnt(bs), limit);
return 0;
}
int
chn_setlatency(struct pcm_channel *c, int latency)
{
CHN_LOCKASSERT(c);
/* Destroy blksz/blkcnt, enforce latency profile. */
return chn_resizebuf(c, latency, -1, 0);
}
int
chn_setblocksize(struct pcm_channel *c, int blkcnt, int blksz)
{
CHN_LOCKASSERT(c);
/* Destroy latency profile, enforce blksz/blkcnt */
return chn_resizebuf(c, -1, blkcnt, blksz);
}
static int
chn_tryspeed(struct pcm_channel *c, int speed)
{
struct pcm_feeder *f;
struct snd_dbuf *b = c->bufhard;
struct snd_dbuf *bs = c->bufsoft;
struct snd_dbuf *x;
int r, delta;
CHN_LOCKASSERT(c);
DEB(printf("setspeed, channel %s\n", c->name));
DEB(printf("want speed %d, ", speed));
if (speed <= 0)
return EINVAL;
if (CHN_STOPPED(c)) {
r = 0;
c->speed = speed;
sndbuf_setspd(bs, speed);
RANGE(speed, chn_getcaps(c)->minspeed, chn_getcaps(c)->maxspeed);
DEB(printf("try speed %d, ", speed));
sndbuf_setspd(b, CHANNEL_SETSPEED(c->methods, c->devinfo, speed));
DEB(printf("got speed %d\n", sndbuf_getspd(b)));
delta = sndbuf_getspd(b) - sndbuf_getspd(bs);
if (delta < 0)
delta = -delta;
c->feederflags &= ~(1 << FEEDER_RATE);
/*
* Used to be 500. It was too big!
*/
if (delta > feeder_rate_round)
c->feederflags |= 1 << FEEDER_RATE;
else
sndbuf_setspd(bs, sndbuf_getspd(b));
r = chn_buildfeeder(c);
DEB(printf("r = %d\n", r));
if (r)
goto out;
if (!(c->feederflags & (1 << FEEDER_RATE)))
goto out;
r = EINVAL;
f = chn_findfeeder(c, FEEDER_RATE);
DEB(printf("feedrate = %p\n", f));
if (f == NULL)
goto out;
x = (c->direction == PCMDIR_REC)? b : bs;
r = FEEDER_SET(f, FEEDRATE_SRC, sndbuf_getspd(x));
DEB(printf("feeder_set(FEEDRATE_SRC, %d) = %d\n", sndbuf_getspd(x), r));
if (r)
goto out;
x = (c->direction == PCMDIR_REC)? bs : b;
r = FEEDER_SET(f, FEEDRATE_DST, sndbuf_getspd(x));
DEB(printf("feeder_set(FEEDRATE_DST, %d) = %d\n", sndbuf_getspd(x), r));
out:
if (!r)
r = CHANNEL_SETFORMAT(c->methods, c->devinfo,
sndbuf_getfmt(b));
if (!r)
sndbuf_setfmt(bs, c->format);
if (!r)
r = chn_resizebuf(c, -2, 0, 0);
DEB(printf("setspeed done, r = %d\n", r));
return r;
} else
return EINVAL;
}
int
chn_setspeed(struct pcm_channel *c, int speed)
{
int r, oldspeed = c->speed;
r = chn_tryspeed(c, speed);
if (r) {
if (snd_verbose > 3)
printf("Failed to set speed %d falling back to %d\n",
speed, oldspeed);
r = chn_tryspeed(c, oldspeed);
}
return r;
}
static int
chn_tryformat(struct pcm_channel *c, u_int32_t fmt)
{
struct snd_dbuf *b = c->bufhard;
struct snd_dbuf *bs = c->bufsoft;
int r;
CHN_LOCKASSERT(c);
if (CHN_STOPPED(c)) {
DEB(printf("want format %d\n", fmt));
c->format = fmt;
r = chn_buildfeeder(c);
if (r == 0) {
sndbuf_setfmt(bs, c->format);
chn_resetbuf(c);
r = CHANNEL_SETFORMAT(c->methods, c->devinfo, sndbuf_getfmt(b));
if (r == 0)
r = chn_tryspeed(c, c->speed);
}
return r;
} else
return EINVAL;
}
int
chn_setformat(struct pcm_channel *c, u_int32_t fmt)
{
u_int32_t oldfmt = c->format;
int r;
r = chn_tryformat(c, fmt);
if (r) {
if (snd_verbose > 3)
printf("Format change 0x%08x failed, reverting to 0x%08x\n",
fmt, oldfmt);
chn_tryformat(c, oldfmt);
}
return r;
}
int
chn_trigger(struct pcm_channel *c, int go)
{
#ifdef DEV_ISA
struct snd_dbuf *b = c->bufhard;
#endif
struct snddev_info *d = c->parentsnddev;
int ret;
CHN_LOCKASSERT(c);
#ifdef DEV_ISA
if (SND_DMA(b) && (go == PCMTRIG_EMLDMAWR || go == PCMTRIG_EMLDMARD))
sndbuf_dmabounce(b);
#endif
if ((go == PCMTRIG_START || go == PCMTRIG_STOP ||
go == PCMTRIG_ABORT) && go == c->trigger)
return 0;
ret = CHANNEL_TRIGGER(c->methods, c->devinfo, go);
if (ret == 0) {
switch (go) {
case PCMTRIG_START:
if (snd_verbose > 3)
device_printf(c->dev,
"%s() %s: calling go=0x%08x , "
"prev=0x%08x\n", __func__, c->name, go,
c->trigger);
if (c->trigger != PCMTRIG_START) {
c->trigger = go;
CHN_UNLOCK(c);
pcm_lock(d);
CHN_INSERT_HEAD(d, c, channels.pcm.busy);
pcm_unlock(d);
CHN_LOCK(c);
}
break;
case PCMTRIG_STOP:
case PCMTRIG_ABORT:
if (snd_verbose > 3)
device_printf(c->dev,
"%s() %s: calling go=0x%08x , "
"prev=0x%08x\n", __func__, c->name, go,
c->trigger);
if (c->trigger == PCMTRIG_START) {
c->trigger = go;
CHN_UNLOCK(c);
pcm_lock(d);
CHN_REMOVE(d, c, channels.pcm.busy);
pcm_unlock(d);
CHN_LOCK(c);
}
break;
default:
break;
}
}
return ret;
}
/**
* @brief Queries sound driver for sample-aligned hardware buffer pointer index
*
* This function obtains the hardware pointer location, then aligns it to
* the current bytes-per-sample value before returning. (E.g., a channel
* running in 16 bit stereo mode would require 4 bytes per sample, so a
* hwptr value ranging from 32-35 would be returned as 32.)
*
* @param c PCM channel context
* @returns sample-aligned hardware buffer pointer index
*/
int
chn_getptr(struct pcm_channel *c)
{
#if 0
int hwptr;
int a = (1 << c->align) - 1;
CHN_LOCKASSERT(c);
hwptr = (c->flags & CHN_F_TRIGGERED)? CHANNEL_GETPTR(c->methods, c->devinfo) : 0;
/* don't allow unaligned values in the hwa ptr */
#if 1
hwptr &= ~a ; /* Apply channel align mask */
#endif
hwptr &= DMA_ALIGN_MASK; /* Apply DMA align mask */
return hwptr;
#endif
int hwptr;
CHN_LOCKASSERT(c);
hwptr = (CHN_STARTED(c)) ? CHANNEL_GETPTR(c->methods, c->devinfo) : 0;
return (hwptr - (hwptr % sndbuf_getbps(c->bufhard)));
}
struct pcmchan_caps *
chn_getcaps(struct pcm_channel *c)
{
CHN_LOCKASSERT(c);
return CHANNEL_GETCAPS(c->methods, c->devinfo);
}
u_int32_t
chn_getformats(struct pcm_channel *c)
{
u_int32_t *fmtlist, fmts;
int i;
fmtlist = chn_getcaps(c)->fmtlist;
fmts = 0;
for (i = 0; fmtlist[i]; i++)
fmts |= fmtlist[i];
/* report software-supported formats */
if (report_soft_formats)
fmts |= AFMT_MU_LAW|AFMT_A_LAW|AFMT_U32_LE|AFMT_U32_BE|
AFMT_S32_LE|AFMT_S32_BE|AFMT_U24_LE|AFMT_U24_BE|
AFMT_S24_LE|AFMT_S24_BE|AFMT_U16_LE|AFMT_U16_BE|
AFMT_S16_LE|AFMT_S16_BE|AFMT_U8|AFMT_S8;
return fmts;
}
static int
chn_buildfeeder(struct pcm_channel *c)
{
struct feeder_class *fc;
struct pcm_feederdesc desc;
u_int32_t tmp[2], type, flags, hwfmt, *fmtlist;
int err;
char fmtstr[AFMTSTR_MAXSZ];
CHN_LOCKASSERT(c);
while (chn_removefeeder(c) == 0)
;
KASSERT((c->feeder == NULL), ("feeder chain not empty"));
c->align = sndbuf_getalign(c->bufsoft);
if (CHN_EMPTY(c, children) || c->direction == PCMDIR_REC) {
/*
* Virtual rec need this.
*/
fc = feeder_getclass(NULL);
KASSERT(fc != NULL, ("can't find root feeder"));
err = chn_addfeeder(c, fc, NULL);
if (err) {
DEB(printf("can't add root feeder, err %d\n", err));
return err;
}
c->feeder->desc->out = c->format;
} else if (c->direction == PCMDIR_PLAY) {
if (c->flags & CHN_F_HAS_VCHAN) {
desc.type = FEEDER_MIXER;
desc.in = c->format;
} else {
DEB(printf("can't decide which feeder type to use!\n"));
return EOPNOTSUPP;
}
desc.out = c->format;
desc.flags = 0;
fc = feeder_getclass(&desc);
if (fc == NULL) {
DEB(printf("can't find vchan feeder\n"));
return EOPNOTSUPP;
}
err = chn_addfeeder(c, fc, &desc);
if (err) {
DEB(printf("can't add vchan feeder, err %d\n", err));
return err;
}
} else
return EOPNOTSUPP;
c->feederflags &= ~(1 << FEEDER_VOLUME);
if (c->direction == PCMDIR_PLAY &&
!(c->flags & CHN_F_VIRTUAL) && c->parentsnddev &&
(c->parentsnddev->flags & SD_F_SOFTPCMVOL) &&
c->parentsnddev->mixer_dev)
c->feederflags |= 1 << FEEDER_VOLUME;
if (!(c->flags & CHN_F_VIRTUAL) && c->parentsnddev &&
((c->direction == PCMDIR_PLAY &&
(c->parentsnddev->flags & SD_F_PSWAPLR)) ||
(c->direction == PCMDIR_REC &&
(c->parentsnddev->flags & SD_F_RSWAPLR))))
c->feederflags |= 1 << FEEDER_SWAPLR;
flags = c->feederflags;
fmtlist = chn_getcaps(c)->fmtlist;
DEB(printf("feederflags %x\n", flags));
for (type = FEEDER_RATE; type < FEEDER_LAST; type++) {
if (flags & (1 << type)) {
desc.type = type;
desc.in = 0;
desc.out = 0;
desc.flags = 0;
DEB(printf("find feeder type %d, ", type));
if (type == FEEDER_VOLUME || type == FEEDER_RATE) {
if (c->feeder->desc->out & AFMT_32BIT)
strlcpy(fmtstr,"s32le", sizeof(fmtstr));
else if (c->feeder->desc->out & AFMT_24BIT)
strlcpy(fmtstr, "s24le", sizeof(fmtstr));
else {
/*
* 8bit doesn't provide enough headroom
* for proper processing without
* creating too much noises. Force to
* 16bit instead.
*/
strlcpy(fmtstr, "s16le", sizeof(fmtstr));
}
if (!(c->feeder->desc->out & AFMT_8BIT) &&
c->feeder->desc->out & AFMT_BIGENDIAN)
afmtstr_swap_endian(fmtstr);
if (!(c->feeder->desc->out & (AFMT_A_LAW | AFMT_MU_LAW)) &&
!(c->feeder->desc->out & AFMT_SIGNED))
afmtstr_swap_sign(fmtstr);
desc.in = afmtstr2afmt(NULL, fmtstr, AFMTSTR_MONO_RETURN);
if (desc.in == 0)
desc.in = AFMT_S16_LE;
/* feeder_volume need stereo processing */
if (type == FEEDER_VOLUME ||
c->feeder->desc->out & AFMT_STEREO)
desc.in |= AFMT_STEREO;
desc.out = desc.in;
} else if (type == FEEDER_SWAPLR) {
desc.in = c->feeder->desc->out;
desc.in |= AFMT_STEREO;
desc.out = desc.in;
}
fc = feeder_getclass(&desc);
DEB(printf("got %p\n", fc));
if (fc == NULL) {
DEB(printf("can't find required feeder type %d\n", type));
return EOPNOTSUPP;
}
if (desc.in == 0 || desc.out == 0)
desc = *fc->desc;
DEB(printf("build fmtchain from 0x%08x to 0x%08x: ", c->feeder->desc->out, fc->desc->in));
tmp[0] = desc.in;
tmp[1] = 0;
if (chn_fmtchain(c, tmp) == 0) {
DEB(printf("failed\n"));
return ENODEV;
}
DEB(printf("ok\n"));
err = chn_addfeeder(c, fc, &desc);
if (err) {
DEB(printf("can't add feeder %p, output 0x%x, err %d\n", fc, fc->desc->out, err));
return err;
}
DEB(printf("added feeder %p, output 0x%x\n", fc, c->feeder->desc->out));
}
}
if (c->direction == PCMDIR_REC) {
tmp[0] = c->format;
tmp[1] = 0;
hwfmt = chn_fmtchain(c, tmp);
} else
hwfmt = chn_fmtchain(c, fmtlist);
if (hwfmt == 0 || !fmtvalid(hwfmt, fmtlist)) {
DEB(printf("Invalid hardware format: 0x%08x\n", hwfmt));
return ENODEV;
} else if (c->direction == PCMDIR_REC && !CHN_EMPTY(c, children)) {
/*
* Kind of awkward. This whole "MIXER" concept need a
* rethinking, I guess :) . Recording is the inverse
* of Playback, which is why we push mixer vchan down here.
*/
if (c->flags & CHN_F_HAS_VCHAN) {
desc.type = FEEDER_MIXER;
desc.in = c->format;
} else
return EOPNOTSUPP;
desc.out = c->format;
desc.flags = 0;
fc = feeder_getclass(&desc);
if (fc == NULL)
return EOPNOTSUPP;
err = chn_addfeeder(c, fc, &desc);
if (err != 0)
return err;
}
sndbuf_setfmt(c->bufhard, hwfmt);
if ((flags & (1 << FEEDER_VOLUME))) {
u_int32_t parent = SOUND_MIXER_NONE;
int vol, left, right;
vol = 100 | (100 << 8);
CHN_UNLOCK(c);
/*
* XXX This is ugly! The way mixer subs being so secretive
* about its own internals force us to use this silly
* monkey trick.
*/
if (mixer_ioctl(c->parentsnddev->mixer_dev,
MIXER_READ(SOUND_MIXER_PCM), (caddr_t)&vol, -1, NULL) != 0)
device_printf(c->dev, "Soft PCM Volume: Failed to read default value\n");
left = vol & 0x7f;
right = (vol >> 8) & 0x7f;
if (c->parentsnddev != NULL &&
c->parentsnddev->mixer_dev != NULL &&
c->parentsnddev->mixer_dev->si_drv1 != NULL)
parent = mix_getparent(
c->parentsnddev->mixer_dev->si_drv1,
SOUND_MIXER_PCM);
if (parent != SOUND_MIXER_NONE) {
vol = 100 | (100 << 8);
if (mixer_ioctl(c->parentsnddev->mixer_dev,
MIXER_READ(parent),
(caddr_t)&vol, -1, NULL) != 0)
device_printf(c->dev, "Soft Volume: Failed to read parent default value\n");
left = (left * (vol & 0x7f)) / 100;
right = (right * ((vol >> 8) & 0x7f)) / 100;
}
CHN_LOCK(c);
chn_setvolume(c, left, right);
}
return 0;
}
int
chn_notify(struct pcm_channel *c, u_int32_t flags)
{
int run;
CHN_LOCK(c);
if (CHN_EMPTY(c, children)) {
CHN_UNLOCK(c);
return ENODEV;
}
run = (CHN_STARTED(c)) ? 1 : 0;
/*
* if the hwchan is running, we can't change its rate, format or
* blocksize
*/
if (run)
flags &= CHN_N_VOLUME | CHN_N_TRIGGER;
if (flags & CHN_N_RATE) {
/*
* we could do something here, like scan children and decide on
* the most appropriate rate to mix at, but we don't for now
*/
}
if (flags & CHN_N_FORMAT) {
/*
* we could do something here, like scan children and decide on
* the most appropriate mixer feeder to use, but we don't for now
*/
}
if (flags & CHN_N_VOLUME) {
/*
* we could do something here but we don't for now
*/
}
if (flags & CHN_N_BLOCKSIZE) {
/*
* Set to default latency profile
*/
chn_setlatency(c, chn_latency);
}
if (flags & CHN_N_TRIGGER) {
int nrun;
nrun = CHN_EMPTY(c, children.busy) ? 0 : 1;
if (nrun && !run)
chn_start(c, 1);
if (!nrun && run)
chn_abort(c);
}
CHN_UNLOCK(c);
return 0;
}
/**
* @brief Fetch array of supported discrete sample rates
*
* Wrapper for CHANNEL_GETRATES. Please see channel_if.m:getrates() for
* detailed information.
*
* @note If the operation isn't supported, this function will just return 0
* (no rates in the array), and *rates will be set to NULL. Callers
* should examine rates @b only if this function returns non-zero.
*
* @param c pcm channel to examine
* @param rates pointer to array of integers; rate table will be recorded here
*
* @return number of rates in the array pointed to be @c rates
*/
int
chn_getrates(struct pcm_channel *c, int **rates)
{
KASSERT(rates != NULL, ("rates is null"));
CHN_LOCKASSERT(c);
return CHANNEL_GETRATES(c->methods, c->devinfo, rates);
}
/**
* @brief Remove channel from a sync group, if there is one.
*
* This function is initially intended for the following conditions:
* - Starting a syncgroup (@c SNDCTL_DSP_SYNCSTART ioctl)
* - Closing a device. (A channel can't be destroyed if it's still in use.)
*
* @note Before calling this function, the syncgroup list mutex must be
* held. (Consider pcm_channel::sm protected by the SG list mutex
* whether @c c is locked or not.)
*
* @param c channel device to be started or closed
* @returns If this channel was the only member of a group, the group ID
* is returned to the caller so that the caller can release it
* via free_unr() after giving up the syncgroup lock. Else it
* returns 0.
*/
int
chn_syncdestroy(struct pcm_channel *c)
{
struct pcmchan_syncmember *sm;
struct pcmchan_syncgroup *sg;
int sg_id;
sg_id = 0;
PCM_SG_LOCKASSERT(MA_OWNED);
if (c->sm != NULL) {
sm = c->sm;
sg = sm->parent;
c->sm = NULL;
KASSERT(sg != NULL, ("syncmember has null parent"));
SLIST_REMOVE(&sg->members, sm, pcmchan_syncmember, link);
free(sm, M_DEVBUF);
if (SLIST_EMPTY(&sg->members)) {
SLIST_REMOVE(&snd_pcm_syncgroups, sg, pcmchan_syncgroup, link);
sg_id = sg->id;
free(sg, M_DEVBUF);
}
}
return sg_id;
}
void
chn_lock(struct pcm_channel *c)
{
CHN_LOCK(c);
}
void
chn_unlock(struct pcm_channel *c)
{
CHN_UNLOCK(c);
}
#ifdef OSSV4_EXPERIMENT
int
chn_getpeaks(struct pcm_channel *c, int *lpeak, int *rpeak)
{
CHN_LOCKASSERT(c);
return CHANNEL_GETPEAKS(c->methods, c->devinfo, lpeak, rpeak);
}
#endif
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