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freebsd-dev/sys/dev/sound/pcm/channel.c
Hans Petter Selasky 4ece1a889b Extend the maximum number of allowed PCM channels in a PCM stream to 
127 and decrease the maximum number of sub-channels to 1. These
definitions are only used inside the kernel and can be changed later
if more than one sub-channel is desired. This has been done to allow
so-called USB audio rack modules to work with FreeBSD.

Bump the FreeBSD version to force recompiling all external modules.

MFC after:	2 weeks
Reviewed by:	mav
2015-05-08 17:00:33 +00:00

2514 lines
60 KiB
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/*-
* Copyright (c) 2005-2009 Ariff Abdullah <ariff@FreeBSD.org>
* Portions Copyright (c) Ryan Beasley <ryan.beasley@gmail.com> - GSoC 2006
* Copyright (c) 1999 Cameron Grant <cg@FreeBSD.org>
* Portions Copyright (c) Luigi Rizzo <luigi@FreeBSD.org> - 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"
#ifdef HAVE_KERNEL_OPTION_HEADERS
#include "opt_snd.h"
#endif
#include <dev/sound/pcm/sound.h>
#include <dev/sound/pcm/vchan.h>
#include "feeder_if.h"
SND_DECLARE_FILE("$FreeBSD$");
int report_soft_formats = 1;
SYSCTL_INT(_hw_snd, OID_AUTO, report_soft_formats, CTLFLAG_RW,
&report_soft_formats, 0, "report software-emulated formats");
int report_soft_matrix = 1;
SYSCTL_INT(_hw_snd, OID_AUTO, report_soft_matrix, CTLFLAG_RW,
&report_soft_matrix, 0, "report software-emulated channel matrixing");
int chn_latency = CHN_LATENCY_DEFAULT;
static int
sysctl_hw_snd_latency(SYSCTL_HANDLER_ARGS)
{
int err, val;
val = chn_latency;
err = sysctl_handle_int(oidp, &val, 0, 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_RWTUN,
0, sizeof(int), sysctl_hw_snd_latency, "I",
"buffering latency (0=low ... 10=high)");
int chn_latency_profile = CHN_LATENCY_PROFILE_DEFAULT;
static int
sysctl_hw_snd_latency_profile(SYSCTL_HANDLER_ARGS)
{
int err, val;
val = chn_latency_profile;
err = sysctl_handle_int(oidp, &val, 0, 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_RWTUN,
0, sizeof(int), sysctl_hw_snd_latency_profile, "I",
"buffering latency profile (0=aggressive 1=safe)");
static int chn_timeout = CHN_TIMEOUT;
static int
sysctl_hw_snd_timeout(SYSCTL_HANDLER_ARGS)
{
int err, val;
val = chn_timeout;
err = sysctl_handle_int(oidp, &val, 0, 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_RWTUN,
0, sizeof(int), sysctl_hw_snd_timeout, "I",
"interrupt timeout (1 - 10) seconds");
static int chn_vpc_autoreset = 1;
SYSCTL_INT(_hw_snd, OID_AUTO, vpc_autoreset, CTLFLAG_RWTUN,
&chn_vpc_autoreset, 0, "automatically reset channels volume to 0db");
static int chn_vol_0db_pcm = SND_VOL_0DB_PCM;
static void
chn_vpc_proc(int reset, int db)
{
struct snddev_info *d;
struct pcm_channel *c;
int i;
for (i = 0; pcm_devclass != NULL &&
i < devclass_get_maxunit(pcm_devclass); i++) {
d = devclass_get_softc(pcm_devclass, i);
if (!PCM_REGISTERED(d))
continue;
PCM_LOCK(d);
PCM_WAIT(d);
PCM_ACQUIRE(d);
CHN_FOREACH(c, d, channels.pcm) {
CHN_LOCK(c);
CHN_SETVOLUME(c, SND_VOL_C_PCM, SND_CHN_T_VOL_0DB, db);
if (reset != 0)
chn_vpc_reset(c, SND_VOL_C_PCM, 1);
CHN_UNLOCK(c);
}
PCM_RELEASE(d);
PCM_UNLOCK(d);
}
}
static int
sysctl_hw_snd_vpc_0db(SYSCTL_HANDLER_ARGS)
{
int err, val;
val = chn_vol_0db_pcm;
err = sysctl_handle_int(oidp, &val, 0, req);
if (err != 0 || req->newptr == NULL)
return (err);
if (val < SND_VOL_0DB_MIN || val > SND_VOL_0DB_MAX)
return (EINVAL);
chn_vol_0db_pcm = val;
chn_vpc_proc(0, val);
return (0);
}
SYSCTL_PROC(_hw_snd, OID_AUTO, vpc_0db, CTLTYPE_INT | CTLFLAG_RWTUN,
0, sizeof(int), sysctl_hw_snd_vpc_0db, "I",
"0db relative level");
static int
sysctl_hw_snd_vpc_reset(SYSCTL_HANDLER_ARGS)
{
int err, val;
val = 0;
err = sysctl_handle_int(oidp, &val, 0, req);
if (err != 0 || req->newptr == NULL || val == 0)
return (err);
chn_vol_0db_pcm = SND_VOL_0DB_PCM;
chn_vpc_proc(1, SND_VOL_0DB_PCM);
return (0);
}
SYSCTL_PROC(_hw_snd, OID_AUTO, vpc_reset, CTLTYPE_INT | CTLFLAG_RW,
0, sizeof(int), sysctl_hw_snd_vpc_reset, "I",
"reset volume on all channels");
static int chn_usefrags = 0;
static int chn_syncdelay = -1;
SYSCTL_INT(_hw_snd, OID_AUTO, usefrags, CTLFLAG_RWTUN,
&chn_usefrags, 0, "prefer setfragments() over setblocksize()");
SYSCTL_INT(_hw_snd, OID_AUTO, syncdelay, CTLFLAG_RWTUN,
&chn_syncdelay, 0,
"append (0-1000) millisecond trailing buffer delay on each sync");
/**
* @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(snd_pcm_syncgroups);
static void
chn_lockinit(struct pcm_channel *c, int dir)
{
switch (dir) {
case PCMDIR_PLAY:
c->lock = snd_mtxcreate(c->name, "pcm play channel");
cv_init(&c->intr_cv, "pcmwr");
break;
case PCMDIR_PLAY_VIRTUAL:
c->lock = snd_mtxcreate(c->name, "pcm virtual play channel");
cv_init(&c->intr_cv, "pcmwrv");
break;
case PCMDIR_REC:
c->lock = snd_mtxcreate(c->name, "pcm record channel");
cv_init(&c->intr_cv, "pcmrd");
break;
case PCMDIR_REC_VIRTUAL:
c->lock = snd_mtxcreate(c->name, "pcm virtual record channel");
cv_init(&c->intr_cv, "pcmrdv");
break;
default:
panic("%s(): Invalid direction=%d", __func__, dir);
break;
}
cv_init(&c->cv, "pcmchn");
}
static void
chn_lockdestroy(struct pcm_channel *c)
{
CHN_LOCKASSERT(c);
CHN_BROADCAST(&c->cv);
CHN_BROADCAST(&c->intr_cv);
cv_destroy(&c->cv);
cv_destroy(&c->intr_cv);
snd_mtxfree(c->lock);
}
/**
* @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;
u_int delta;
CHN_LOCKASSERT(c);
if (c->flags & CHN_F_MMAP) {
if (sndbuf_getprevtotal(bs) < c->lw)
delta = c->lw;
else
delta = sndbuf_gettotal(bs) - sndbuf_getprevtotal(bs);
} else {
if (c->direction == PCMDIR_PLAY)
delta = sndbuf_getfree(bs);
else
delta = sndbuf_getready(bs);
}
return ((delta < c->lw) ? 0 : 1);
}
static void
chn_pollreset(struct pcm_channel *c)
{
CHN_LOCKASSERT(c);
sndbuf_updateprevtotal(c->bufsoft);
}
static void
chn_wakeup(struct pcm_channel *c)
{
struct snd_dbuf *bs;
struct pcm_channel *ch;
CHN_LOCKASSERT(c);
bs = c->bufsoft;
if (CHN_EMPTY(c, children.busy)) {
if (SEL_WAITING(sndbuf_getsel(bs)) && chn_polltrigger(c))
selwakeuppri(sndbuf_getsel(bs), PRIBIO);
if (c->flags & CHN_F_SLEEPING) {
/*
* Ok, I can just panic it right here since it is
* quite obvious that we never allow multiple waiters
* from userland. I'm too generous...
*/
CHN_BROADCAST(&c->intr_cv);
}
} else {
CHN_FOREACH(ch, c, children.busy) {
CHN_LOCK(ch);
chn_wakeup(ch);
CHN_UNLOCK(ch);
}
}
}
static int
chn_sleep(struct pcm_channel *c, int timeout)
{
int ret;
CHN_LOCKASSERT(c);
if (c->flags & CHN_F_DEAD)
return (EINVAL);
c->flags |= CHN_F_SLEEPING;
ret = cv_timedwait_sig(&c->intr_cv, c->lock, timeout);
c->flags &= ~CHN_F_SLEEPING;
return ((c->flags & CHN_F_DEAD) ? EINVAL : 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);
if (c->direction == PCMDIR_PLAY) {
amt = min(delta, sndbuf_getready(b));
amt -= amt % sndbuf_getalign(b);
if (amt > 0)
sndbuf_dispose(b, NULL, amt);
} else {
amt = min(delta, sndbuf_getfree(b));
amt -= amt % sndbuf_getalign(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;
}
static void
chn_wrfeed(struct pcm_channel *c)
{
struct snd_dbuf *b = c->bufhard;
struct snd_dbuf *bs = c->bufsoft;
unsigned int amt, want, wasfree;
CHN_LOCKASSERT(c);
if ((c->flags & CHN_F_MMAP) && !(c->flags & CHN_F_CLOSING))
sndbuf_acquire(bs, NULL, sndbuf_getfree(bs));
wasfree = sndbuf_getfree(b);
want = min(sndbuf_getsize(b),
imax(0, sndbuf_xbytes(sndbuf_getsize(bs), bs, b) -
sndbuf_getready(b)));
amt = min(wasfree, want);
if (amt > 0)
sndbuf_feed(bs, b, c, c->feeder, amt);
/*
* Possible xruns. There should be no empty space left in buffer.
*/
if (sndbuf_getready(b) < want)
c->xruns++;
if (sndbuf_getfree(b) < wasfree)
chn_wakeup(c);
}
#if 0
static void
chn_wrupdate(struct pcm_channel *c)
{
CHN_LOCKASSERT(c);
KASSERT(c->direction == PCMDIR_PLAY, ("%s(): bad channel", __func__));
if ((c->flags & (CHN_F_MMAP | CHN_F_VIRTUAL)) || CHN_STOPPED(c))
return;
chn_dmaupdate(c);
chn_wrfeed(c);
/* tell the driver we've updated the primary buffer */
chn_trigger(c, PCMTRIG_EMLDMAWR);
}
#endif
static void
chn_wrintr(struct pcm_channel *c)
{
CHN_LOCKASSERT(c);
/* update pointers in primary buffer */
chn_dmaupdate(c);
/* ...and feed from secondary to primary */
chn_wrfeed(c);
/* tell the driver we've updated the primary buffer */
chn_trigger(c, PCMTRIG_EMLDMAWR);
}
/*
* 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) && !(c->flags & CHN_F_NOTRIGGER)) {
ret = chn_start(c, 0);
if (ret != 0)
c->flags |= CHN_F_DEAD;
}
} 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, timeout);
if (ret == EAGAIN) {
ret = EINVAL;
c->flags |= CHN_F_DEAD;
device_printf(c->dev, "%s(): %s: "
"play interrupt timeout, channel dead\n",
__func__, c->name);
} else if (ret == ERESTART || ret == EINTR)
c->flags |= CHN_F_ABORTING;
}
}
return (ret);
}
/*
* Feed new data from the read buffer. Can be called in the bottom half.
*/
static void
chn_rdfeed(struct pcm_channel *c)
{
struct snd_dbuf *b = c->bufhard;
struct snd_dbuf *bs = c->bufsoft;
unsigned int amt;
CHN_LOCKASSERT(c);
if (c->flags & CHN_F_MMAP)
sndbuf_dispose(bs, NULL, sndbuf_getready(bs));
amt = sndbuf_getfree(bs);
if (amt > 0)
sndbuf_feed(b, bs, c, c->feeder, amt);
amt = sndbuf_getready(b);
if (amt > 0) {
c->xruns++;
sndbuf_dispose(b, NULL, amt);
}
if (sndbuf_getready(bs) > 0)
chn_wakeup(c);
}
#if 0
static void
chn_rdupdate(struct pcm_channel *c)
{
CHN_LOCKASSERT(c);
KASSERT(c->direction == PCMDIR_REC, ("chn_rdupdate on bad channel"));
if ((c->flags & (CHN_F_MMAP | CHN_F_VIRTUAL)) || CHN_STOPPED(c))
return;
chn_trigger(c, PCMTRIG_EMLDMARD);
chn_dmaupdate(c);
chn_rdfeed(c);
}
#endif
/* read interrupt routine. Must be called with interrupts blocked. */
static void
chn_rdintr(struct pcm_channel *c)
{
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 */
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) && !(c->flags & CHN_F_NOTRIGGER)) {
ret = chn_start(c, 0);
if (ret != 0) {
c->flags |= CHN_F_DEAD;
return (ret);
}
}
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, timeout);
if (ret == EAGAIN) {
ret = EINVAL;
c->flags |= CHN_F_DEAD;
device_printf(c->dev, "%s(): %s: "
"record interrupt timeout, channel dead\n",
__func__, c->name);
} else if (ret == ERESTART || ret == EINTR)
c->flags |= CHN_F_ABORTING;
}
}
return (ret);
}
void
chn_intr_locked(struct pcm_channel *c)
{
CHN_LOCKASSERT(c);
c->interrupts++;
if (c->direction == PCMDIR_PLAY)
chn_wrintr(c);
else
chn_rdintr(c);
}
void
chn_intr(struct pcm_channel *c)
{
if (CHN_LOCKOWNED(c)) {
chn_intr_locked(c);
return;
}
CHN_LOCK(c);
chn_intr_locked(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;
int err;
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);
err = 0;
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 = CHN_BUF_PARENT(c, b);
i = sndbuf_xbytes(sndbuf_getready(bs), bs, pb);
j = sndbuf_getalign(pb);
}
}
if (snd_verbose > 3 && CHN_EMPTY(c, children))
device_printf(c->dev, "%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);
if (c->flags & CHN_F_CLOSING)
c->feedcount = 2;
else {
c->feedcount = 0;
c->interrupts = 0;
c->xruns = 0;
}
if (c->parentchannel == NULL) {
if (c->direction == PCMDIR_PLAY)
sndbuf_fillsilence_rl(b,
sndbuf_xbytes(sndbuf_getsize(bs), bs, b));
if (snd_verbose > 3)
device_printf(c->dev,
"%s(): %s starting! (%s/%s) "
"(ready=%d force=%d i=%d j=%d "
"intrtimeout=%u latency=%dms)\n",
__func__,
(c->flags & CHN_F_HAS_VCHAN) ?
"VCHAN PARENT" : "HW", CHN_DIRSTR(c),
(c->flags & CHN_F_CLOSING) ? "closing" :
"running",
sndbuf_getready(b),
force, i, j, c->timeout,
(sndbuf_getsize(b) * 1000) /
(sndbuf_getalign(b) * sndbuf_getspd(b)));
}
err = chn_trigger(c, PCMTRIG_START);
}
return (err);
}
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);
if (c->direction != PCMDIR_PLAY)
return (EINVAL);
bs = c->bufsoft;
if ((c->flags & (CHN_F_DEAD | CHN_F_ABORTING)) ||
(threshold < 1 && sndbuf_getready(bs) < 1))
return (0);
/* 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 != 0)
return (ret);
} else
return (0);
}
b = CHN_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_getalign(bs) * sndbuf_getspd(bs) *
((syncdelay > 1000) ? 1000 : syncdelay)) / 1000;
minflush -= minflush % sndbuf_getalign(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) {
device_printf(c->dev,
"%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)
device_printf(c->dev, "%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, c->timeout);
if (ret == ERESTART || ret == EINTR) {
c->flags |= CHN_F_ABORTING;
break;
} else if (ret == 0 || ret == EAGAIN) {
resid = sndbuf_getready(bs);
if (resid == residp) {
--count;
if (snd_verbose > 3)
device_printf(c->dev,
"%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)
device_printf(c->dev,
"%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;
} else
break;
}
c->flags &= ~CHN_F_CLOSING;
c->flags |= cflag;
if (snd_verbose > 3)
device_printf(c->dev,
"%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_MMAP | CHN_F_TRIGGERED))) {
ret = chn_start(c, 1);
if (ret != 0)
return (0);
}
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
snd_fmtvalid(uint32_t fmt, uint32_t *fmtlist)
{
int i;
for (i = 0; fmtlist[i] != 0; i++) {
if (fmt == fmtlist[i] ||
((fmt & AFMT_PASSTHROUGH) &&
(AFMT_ENCODING(fmt) & fmtlist[i])))
return (1);
}
return (0);
}
static const struct {
char *name, *alias1, *alias2;
uint32_t afmt;
} afmt_tab[] = {
{ "alaw", NULL, NULL, AFMT_A_LAW },
{ "mulaw", NULL, NULL, AFMT_MU_LAW },
{ "u8", "8", NULL, AFMT_U8 },
{ "s8", NULL, NULL, AFMT_S8 },
#if BYTE_ORDER == LITTLE_ENDIAN
{ "s16le", "s16", "16", AFMT_S16_LE },
{ "s16be", NULL, NULL, AFMT_S16_BE },
#else
{ "s16le", NULL, NULL, AFMT_S16_LE },
{ "s16be", "s16", "16", AFMT_S16_BE },
#endif
{ "u16le", NULL, NULL, AFMT_U16_LE },
{ "u16be", NULL, NULL, AFMT_U16_BE },
{ "s24le", NULL, NULL, AFMT_S24_LE },
{ "s24be", NULL, NULL, AFMT_S24_BE },
{ "u24le", NULL, NULL, AFMT_U24_LE },
{ "u24be", NULL, NULL, AFMT_U24_BE },
#if BYTE_ORDER == LITTLE_ENDIAN
{ "s32le", "s32", "32", AFMT_S32_LE },
{ "s32be", NULL, NULL, AFMT_S32_BE },
#else
{ "s32le", NULL, NULL, AFMT_S32_LE },
{ "s32be", "s32", "32", AFMT_S32_BE },
#endif
{ "u32le", NULL, NULL, AFMT_U32_LE },
{ "u32be", NULL, NULL, AFMT_U32_BE },
{ "ac3", NULL, NULL, AFMT_AC3 },
{ NULL, NULL, NULL, 0 }
};
uint32_t
snd_str2afmt(const char *req)
{
int ext;
int ch;
int i;
char b1[8];
char b2[8];
memset(b1, 0, sizeof(b1));
memset(b2, 0, sizeof(b2));
i = sscanf(req, "%5[^:]:%6s", b1, b2);
if (i == 1) {
if (strlen(req) != strlen(b1))
return (0);
strlcpy(b2, "2.0", sizeof(b2));
} else if (i == 2) {
if (strlen(req) != (strlen(b1) + 1 + strlen(b2)))
return (0);
} else
return (0);
i = sscanf(b2, "%d.%d", &ch, &ext);
if (i == 0) {
if (strcasecmp(b2, "mono") == 0) {
ch = 1;
ext = 0;
} else if (strcasecmp(b2, "stereo") == 0) {
ch = 2;
ext = 0;
} else if (strcasecmp(b2, "quad") == 0) {
ch = 4;
ext = 0;
} else
return (0);
} else if (i == 1) {
if (ch < 1 || ch > AFMT_CHANNEL_MAX)
return (0);
ext = 0;
} else if (i == 2) {
if (ext < 0 || ext > AFMT_EXTCHANNEL_MAX)
return (0);
if (ch < 1 || (ch + ext) > AFMT_CHANNEL_MAX)
return (0);
} else
return (0);
for (i = 0; afmt_tab[i].name != NULL; i++) {
if (strcasecmp(afmt_tab[i].name, b1) != 0) {
if (afmt_tab[i].alias1 == NULL)
continue;
if (strcasecmp(afmt_tab[i].alias1, b1) != 0) {
if (afmt_tab[i].alias2 == NULL)
continue;
if (strcasecmp(afmt_tab[i].alias2, b1) != 0)
continue;
}
}
/* found a match */
return (SND_FORMAT(afmt_tab[i].afmt, ch + ext, ext));
}
/* not a valid format */
return (0);
}
uint32_t
snd_afmt2str(uint32_t afmt, char *buf, size_t len)
{
uint32_t enc;
uint32_t ext;
uint32_t ch;
int i;
if (buf == NULL || len < AFMTSTR_LEN)
return (0);
memset(buf, 0, len);
enc = AFMT_ENCODING(afmt);
ch = AFMT_CHANNEL(afmt);
ext = AFMT_EXTCHANNEL(afmt);
/* check there is at least one channel */
if (ch <= ext)
return (0);
for (i = 0; afmt_tab[i].name != NULL; i++) {
if (enc != afmt_tab[i].afmt)
continue;
/* found a match */
snprintf(buf, len, "%s:%d.%d",
afmt_tab[i].name, ch - ext, ext);
return (SND_FORMAT(enc, ch, ext));
}
return (0);
}
int
chn_reset(struct pcm_channel *c, uint32_t fmt, uint32_t spd)
{
int r;
CHN_LOCKASSERT(c);
c->feedcount = 0;
c->flags &= CHN_F_RESET;
c->interrupts = 0;
c->timeout = 1;
c->xruns = 0;
c->flags |= (pcm_getflags(c->dev) & SD_F_BITPERFECT) ?
CHN_F_BITPERFECT : 0;
r = CHANNEL_RESET(c->methods, c->devinfo);
if (r == 0 && fmt != 0 && spd != 0) {
r = chn_setparam(c, fmt, spd);
fmt = 0;
spd = 0;
}
if (r == 0 && fmt != 0)
r = chn_setformat(c, fmt);
if (r == 0 && spd != 0)
r = chn_setspeed(c, spd);
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 i, 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;
c->format = SND_FORMAT(AFMT_U8, 1, 0);
c->speed = DSP_DEFAULT_SPEED;
c->matrix = *feeder_matrix_id_map(SND_CHN_MATRIX_1_0);
c->matrix.id = SND_CHN_MATRIX_PCMCHANNEL;
for (i = 0; i < SND_CHN_T_MAX; i++) {
c->volume[SND_VOL_C_MASTER][i] = SND_VOL_0DB_MASTER;
}
c->volume[SND_VOL_C_MASTER][SND_CHN_T_VOL_0DB] = SND_VOL_0DB_MASTER;
c->volume[SND_VOL_C_PCM][SND_CHN_T_VOL_0DB] = chn_vol_0db_pcm;
chn_vpc_reset(c, SND_VOL_C_PCM, 1);
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 = 0;
c->direction = direction;
sndbuf_setfmt(b, c->format);
sndbuf_setspd(b, c->speed);
sndbuf_setfmt(bs, c->format);
sndbuf_setspd(bs, c->speed);
/**
* @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);
CHN_LOCK(c);
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);
sndbuf_destroy(bs);
sndbuf_destroy(b);
CHN_LOCK(c);
c->flags |= CHN_F_DEAD;
chn_lockdestroy(c);
return (0);
}
/* XXX Obsolete. Use *_matrix() variant instead. */
int
chn_setvolume(struct pcm_channel *c, int left, int right)
{
int ret;
ret = chn_setvolume_matrix(c, SND_VOL_C_MASTER, SND_CHN_T_FL, left);
ret |= chn_setvolume_matrix(c, SND_VOL_C_MASTER, SND_CHN_T_FR,
right) << 8;
return (ret);
}
int
chn_setvolume_multi(struct pcm_channel *c, int vc, int left, int right,
int center)
{
int i, ret;
ret = 0;
for (i = 0; i < SND_CHN_T_MAX; i++) {
if ((1 << i) & SND_CHN_LEFT_MASK)
ret |= chn_setvolume_matrix(c, vc, i, left);
else if ((1 << i) & SND_CHN_RIGHT_MASK)
ret |= chn_setvolume_matrix(c, vc, i, right) << 8;
else
ret |= chn_setvolume_matrix(c, vc, i, center) << 16;
}
return (ret);
}
int
chn_setvolume_matrix(struct pcm_channel *c, int vc, int vt, int val)
{
int i;
KASSERT(c != NULL && vc >= SND_VOL_C_MASTER && vc < SND_VOL_C_MAX &&
(vc == SND_VOL_C_MASTER || (vc & 1)) &&
(vt == SND_CHN_T_VOL_0DB || (vt >= SND_CHN_T_BEGIN &&
vt <= SND_CHN_T_END)) && (vt != SND_CHN_T_VOL_0DB ||
(val >= SND_VOL_0DB_MIN && val <= SND_VOL_0DB_MAX)),
("%s(): invalid volume matrix c=%p vc=%d vt=%d val=%d",
__func__, c, vc, vt, val));
CHN_LOCKASSERT(c);
if (val < 0)
val = 0;
if (val > 100)
val = 100;
c->volume[vc][vt] = val;
/*
* Do relative calculation here and store it into class + 1
* to ease the job of feeder_volume.
*/
if (vc == SND_VOL_C_MASTER) {
for (vc = SND_VOL_C_BEGIN; vc <= SND_VOL_C_END;
vc += SND_VOL_C_STEP)
c->volume[SND_VOL_C_VAL(vc)][vt] =
SND_VOL_CALC_VAL(c->volume, vc, vt);
} else if (vc & 1) {
if (vt == SND_CHN_T_VOL_0DB)
for (i = SND_CHN_T_BEGIN; i <= SND_CHN_T_END;
i += SND_CHN_T_STEP) {
c->volume[SND_VOL_C_VAL(vc)][i] =
SND_VOL_CALC_VAL(c->volume, vc, i);
}
else
c->volume[SND_VOL_C_VAL(vc)][vt] =
SND_VOL_CALC_VAL(c->volume, vc, vt);
}
return (val);
}
int
chn_getvolume_matrix(struct pcm_channel *c, int vc, int vt)
{
KASSERT(c != NULL && vc >= SND_VOL_C_MASTER && vc < SND_VOL_C_MAX &&
(vt == SND_CHN_T_VOL_0DB ||
(vt >= SND_CHN_T_BEGIN && vt <= SND_CHN_T_END)),
("%s(): invalid volume matrix c=%p vc=%d vt=%d",
__func__, c, vc, vt));
CHN_LOCKASSERT(c);
return (c->volume[vc][vt]);
}
struct pcmchan_matrix *
chn_getmatrix(struct pcm_channel *c)
{
KASSERT(c != NULL, ("%s(): NULL channel", __func__));
CHN_LOCKASSERT(c);
if (!(c->format & AFMT_CONVERTIBLE))
return (NULL);
return (&c->matrix);
}
int
chn_setmatrix(struct pcm_channel *c, struct pcmchan_matrix *m)
{
KASSERT(c != NULL && m != NULL,
("%s(): NULL channel or matrix", __func__));
CHN_LOCKASSERT(c);
if (!(c->format & AFMT_CONVERTIBLE))
return (EINVAL);
c->matrix = *m;
c->matrix.id = SND_CHN_MATRIX_PCMCHANNEL;
return (chn_setformat(c, SND_FORMAT(c->format, m->channels, m->ext)));
}
/*
* XXX chn_oss_* exists for the sake of compatibility.
*/
int
chn_oss_getorder(struct pcm_channel *c, unsigned long long *map)
{
KASSERT(c != NULL && map != NULL,
("%s(): NULL channel or map", __func__));
CHN_LOCKASSERT(c);
if (!(c->format & AFMT_CONVERTIBLE))
return (EINVAL);
return (feeder_matrix_oss_get_channel_order(&c->matrix, map));
}
int
chn_oss_setorder(struct pcm_channel *c, unsigned long long *map)
{
struct pcmchan_matrix m;
int ret;
KASSERT(c != NULL && map != NULL,
("%s(): NULL channel or map", __func__));
CHN_LOCKASSERT(c);
if (!(c->format & AFMT_CONVERTIBLE))
return (EINVAL);
m = c->matrix;
ret = feeder_matrix_oss_set_channel_order(&m, map);
if (ret != 0)
return (ret);
return (chn_setmatrix(c, &m));
}
#define SND_CHN_OSS_FRONT (SND_CHN_T_MASK_FL | SND_CHN_T_MASK_FR)
#define SND_CHN_OSS_SURR (SND_CHN_T_MASK_SL | SND_CHN_T_MASK_SR)
#define SND_CHN_OSS_CENTER_LFE (SND_CHN_T_MASK_FC | SND_CHN_T_MASK_LF)
#define SND_CHN_OSS_REAR (SND_CHN_T_MASK_BL | SND_CHN_T_MASK_BR)
int
chn_oss_getmask(struct pcm_channel *c, uint32_t *retmask)
{
struct pcmchan_matrix *m;
struct pcmchan_caps *caps;
uint32_t i, format;
KASSERT(c != NULL && retmask != NULL,
("%s(): NULL channel or retmask", __func__));
CHN_LOCKASSERT(c);
caps = chn_getcaps(c);
if (caps == NULL || caps->fmtlist == NULL)
return (ENODEV);
for (i = 0; caps->fmtlist[i] != 0; i++) {
format = caps->fmtlist[i];
if (!(format & AFMT_CONVERTIBLE)) {
*retmask |= DSP_BIND_SPDIF;
continue;
}
m = CHANNEL_GETMATRIX(c->methods, c->devinfo, format);
if (m == NULL)
continue;
if (m->mask & SND_CHN_OSS_FRONT)
*retmask |= DSP_BIND_FRONT;
if (m->mask & SND_CHN_OSS_SURR)
*retmask |= DSP_BIND_SURR;
if (m->mask & SND_CHN_OSS_CENTER_LFE)
*retmask |= DSP_BIND_CENTER_LFE;
if (m->mask & SND_CHN_OSS_REAR)
*retmask |= DSP_BIND_REAR;
}
/* report software-supported binding mask */
if (!CHN_BITPERFECT(c) && report_soft_matrix)
*retmask |= DSP_BIND_FRONT | DSP_BIND_SURR |
DSP_BIND_CENTER_LFE | DSP_BIND_REAR;
return (0);
}
void
chn_vpc_reset(struct pcm_channel *c, int vc, int force)
{
int i;
KASSERT(c != NULL && vc >= SND_VOL_C_BEGIN && vc <= SND_VOL_C_END,
("%s(): invalid reset c=%p vc=%d", __func__, c, vc));
CHN_LOCKASSERT(c);
if (force == 0 && chn_vpc_autoreset == 0)
return;
for (i = SND_CHN_T_BEGIN; i <= SND_CHN_T_END; i += SND_CHN_T_STEP)
CHN_SETVOLUME(c, vc, i, c->volume[vc][SND_CHN_T_VOL_0DB]);
}
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 = 0, nsblksz, nsblkcnt;
int ret;
CHN_LOCKASSERT(c);
if ((c->flags & (CHN_F_MMAP | 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;
}
bs = c->bufsoft;
b = c->bufhard;
if (!(blksz == 0 || blkcnt == -1) &&
(blksz < 16 || blksz < sndbuf_getalign(bs) || blkcnt < 2 ||
(blksz * blkcnt) > CHN_2NDBUFMAXSIZE))
return EINVAL;
chn_calclatency(c->direction, latency, sndbuf_getalign(bs),
sndbuf_getalign(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_getalign(bs));
sblkcnt = round_pow2(blkcnt);
}
if (c->parentchannel != NULL) {
pb = c->parentchannel->bufsoft;
CHN_UNLOCK(c);
CHN_LOCK(c->parentchannel);
chn_notify(c->parentchannel, CHN_N_BLOCKSIZE);
CHN_UNLOCK(c->parentchannel);
CHN_LOCK(c);
if (c->direction == PCMDIR_PLAY) {
limit = (pb != NULL) ?
sndbuf_xbytes(sndbuf_getsize(pb), pb, bs) : 0;
} else {
limit = (pb != NULL) ?
sndbuf_xbytes(sndbuf_getblksz(pb), pb, bs) * 2 : 0;
}
} else {
hblkcnt = 2;
if (c->flags & CHN_F_HAS_SIZE) {
hblksz = round_blksz(sndbuf_xbytes(sblksz, bs, b),
sndbuf_getalign(b));
hblkcnt = round_pow2(sndbuf_getblkcnt(bs));
} else
chn_calclatency(c->direction, latency,
sndbuf_getalign(b),
sndbuf_getalign(b) * sndbuf_getspd(b),
CHN_2NDBUFMAXSIZE, &hblksz, &hblkcnt);
if ((hblksz << 1) > sndbuf_getmaxsize(b))
hblksz = round_blksz(sndbuf_getmaxsize(b) >> 1,
sndbuf_getalign(b));
while ((hblksz * hblkcnt) > sndbuf_getmaxsize(b)) {
if (hblkcnt < 4)
hblksz >>= 1;
else
hblkcnt >>= 1;
}
hblksz -= hblksz % sndbuf_getalign(b);
#if 0
hblksz = sndbuf_getmaxsize(b) >> 1;
hblksz -= hblksz % sndbuf_getalign(b);
hblkcnt = 2;
#endif
CHN_UNLOCK(c);
if (chn_usefrags == 0 ||
CHANNEL_SETFRAGMENTS(c->methods, c->devinfo,
hblksz, hblkcnt) != 0)
sndbuf_setblksz(b, CHANNEL_SETBLOCKSIZE(c->methods,
c->devinfo, hblksz));
CHN_LOCK(c);
if (!CHN_EMPTY(c, children)) {
nsblksz = round_blksz(
sndbuf_xbytes(sndbuf_getblksz(b), b, bs),
sndbuf_getalign(bs));
nsblkcnt = sndbuf_getblkcnt(b);
if (c->direction == PCMDIR_PLAY) {
do {
nsblkcnt--;
} while (nsblkcnt >= 2 &&
nsblksz * nsblkcnt >= sblksz * sblkcnt);
nsblkcnt++;
}
sblksz = nsblksz;
sblkcnt = nsblkcnt;
limit = 0;
} else
limit = sndbuf_xbytes(sndbuf_getblksz(b), b, bs) * 2;
}
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_getalign(bs);
if (sndbuf_getblkcnt(bs) != sblkcnt || sndbuf_getblksz(bs) != sblksz ||
sndbuf_getsize(bs) != (sblkcnt * sblksz)) {
ret = sndbuf_remalloc(bs, sblkcnt, sblksz);
if (ret != 0) {
device_printf(c->dev, "%s(): Failed: %d %d\n",
__func__, sblkcnt, sblksz);
return ret;
}
}
/*
* Interrupt timeout
*/
c->timeout = ((u_int64_t)hz * sndbuf_getsize(bs)) /
((u_int64_t)sndbuf_getspd(bs) * sndbuf_getalign(bs));
if (c->parentchannel != NULL)
c->timeout = min(c->timeout, c->parentchannel->timeout);
if (c->timeout < 1)
c->timeout = 1;
/*
* 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)
device_printf(c->dev, "%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);
}
int
chn_setparam(struct pcm_channel *c, uint32_t format, uint32_t speed)
{
struct pcmchan_caps *caps;
uint32_t hwspeed, delta;
int ret;
CHN_LOCKASSERT(c);
if (speed < 1 || format == 0 || CHN_STARTED(c))
return (EINVAL);
c->format = format;
c->speed = speed;
caps = chn_getcaps(c);
hwspeed = speed;
RANGE(hwspeed, caps->minspeed, caps->maxspeed);
sndbuf_setspd(c->bufhard, CHANNEL_SETSPEED(c->methods, c->devinfo,
hwspeed));
hwspeed = sndbuf_getspd(c->bufhard);
delta = (hwspeed > speed) ? (hwspeed - speed) : (speed - hwspeed);
if (delta <= feeder_rate_round)
c->speed = hwspeed;
ret = feeder_chain(c);
if (ret == 0)
ret = CHANNEL_SETFORMAT(c->methods, c->devinfo,
sndbuf_getfmt(c->bufhard));
if (ret == 0)
ret = chn_resizebuf(c, -2, 0, 0);
return (ret);
}
int
chn_setspeed(struct pcm_channel *c, uint32_t speed)
{
uint32_t oldformat, oldspeed, format;
int ret;
#if 0
/* XXX force 48k */
if (c->format & AFMT_PASSTHROUGH)
speed = AFMT_PASSTHROUGH_RATE;
#endif
oldformat = c->format;
oldspeed = c->speed;
format = oldformat;
ret = chn_setparam(c, format, speed);
if (ret != 0) {
if (snd_verbose > 3)
device_printf(c->dev,
"%s(): Setting speed %d failed, "
"falling back to %d\n",
__func__, speed, oldspeed);
chn_setparam(c, c->format, oldspeed);
}
return (ret);
}
int
chn_setformat(struct pcm_channel *c, uint32_t format)
{
uint32_t oldformat, oldspeed, speed;
int ret;
/* XXX force stereo */
if ((format & AFMT_PASSTHROUGH) && AFMT_CHANNEL(format) < 2) {
format = SND_FORMAT(format, AFMT_PASSTHROUGH_CHANNEL,
AFMT_PASSTHROUGH_EXTCHANNEL);
}
oldformat = c->format;
oldspeed = c->speed;
speed = oldspeed;
ret = chn_setparam(c, format, speed);
if (ret != 0) {
if (snd_verbose > 3)
device_printf(c->dev,
"%s(): Format change 0x%08x failed, "
"falling back to 0x%08x\n",
__func__, format, oldformat);
chn_setparam(c, oldformat, oldspeed);
}
return (ret);
}
void
chn_syncstate(struct pcm_channel *c)
{
struct snddev_info *d;
struct snd_mixer *m;
d = (c != NULL) ? c->parentsnddev : NULL;
m = (d != NULL && d->mixer_dev != NULL) ? d->mixer_dev->si_drv1 :
NULL;
if (d == NULL || m == NULL)
return;
CHN_LOCKASSERT(c);
if (c->feederflags & (1 << FEEDER_VOLUME)) {
uint32_t parent;
int vol, pvol, left, right, center;
if (c->direction == PCMDIR_PLAY &&
(d->flags & SD_F_SOFTPCMVOL)) {
/* CHN_UNLOCK(c); */
vol = mix_get(m, SOUND_MIXER_PCM);
parent = mix_getparent(m, SOUND_MIXER_PCM);
if (parent != SOUND_MIXER_NONE)
pvol = mix_get(m, parent);
else
pvol = 100 | (100 << 8);
/* CHN_LOCK(c); */
} else {
vol = 100 | (100 << 8);
pvol = vol;
}
if (vol == -1) {
device_printf(c->dev,
"Soft PCM Volume: Failed to read pcm "
"default value\n");
vol = 100 | (100 << 8);
}
if (pvol == -1) {
device_printf(c->dev,
"Soft PCM Volume: Failed to read parent "
"default value\n");
pvol = 100 | (100 << 8);
}
left = ((vol & 0x7f) * (pvol & 0x7f)) / 100;
right = (((vol >> 8) & 0x7f) * ((pvol >> 8) & 0x7f)) / 100;
center = (left + right) >> 1;
chn_setvolume_multi(c, SND_VOL_C_MASTER, left, right, center);
}
if (c->feederflags & (1 << FEEDER_EQ)) {
struct pcm_feeder *f;
int treble, bass, state;
/* CHN_UNLOCK(c); */
treble = mix_get(m, SOUND_MIXER_TREBLE);
bass = mix_get(m, SOUND_MIXER_BASS);
/* CHN_LOCK(c); */
if (treble == -1)
treble = 50;
else
treble = ((treble & 0x7f) +
((treble >> 8) & 0x7f)) >> 1;
if (bass == -1)
bass = 50;
else
bass = ((bass & 0x7f) + ((bass >> 8) & 0x7f)) >> 1;
f = chn_findfeeder(c, FEEDER_EQ);
if (f != NULL) {
if (FEEDER_SET(f, FEEDEQ_TREBLE, treble) != 0)
device_printf(c->dev,
"EQ: Failed to set treble -- %d\n",
treble);
if (FEEDER_SET(f, FEEDEQ_BASS, bass) != 0)
device_printf(c->dev,
"EQ: Failed to set bass -- %d\n",
bass);
if (FEEDER_SET(f, FEEDEQ_PREAMP, d->eqpreamp) != 0)
device_printf(c->dev,
"EQ: Failed to set preamp -- %d\n",
d->eqpreamp);
if (d->flags & SD_F_EQ_BYPASSED)
state = FEEDEQ_BYPASS;
else if (d->flags & SD_F_EQ_ENABLED)
state = FEEDEQ_ENABLE;
else
state = FEEDEQ_DISABLE;
if (FEEDER_SET(f, FEEDEQ_STATE, state) != 0)
device_printf(c->dev,
"EQ: Failed to set state -- %d\n", state);
}
}
}
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 (!PCMTRIG_COMMON(go))
return (CHANNEL_TRIGGER(c->methods, c->devinfo, go));
if (go == c->trigger)
return (0);
ret = CHANNEL_TRIGGER(c->methods, c->devinfo, go);
if (ret != 0)
return (ret);
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);
chn_syncstate(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 (0);
}
/**
* @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)
{
int hwptr;
CHN_LOCKASSERT(c);
hwptr = (CHN_STARTED(c)) ? CHANNEL_GETPTR(c->methods, c->devinfo) : 0;
return (hwptr - (hwptr % sndbuf_getalign(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 (!CHN_BITPERFECT(c) && report_soft_formats)
fmts |= AFMT_CONVERTIBLE;
return (AFMT_ENCODING(fmts));
}
int
chn_notify(struct pcm_channel *c, u_int32_t flags)
{
struct pcm_channel *ch;
struct pcmchan_caps *caps;
uint32_t bestformat, bestspeed, besthwformat, *vchanformat, *vchanrate;
uint32_t vpflags;
int dirty, err, run, nrun;
CHN_LOCKASSERT(c);
if (CHN_EMPTY(c, children))
return (ENODEV);
err = 0;
/*
* If the hwchan is running, we can't change its rate, format or
* blocksize
*/
run = (CHN_STARTED(c)) ? 1 : 0;
if (run)
flags &= CHN_N_VOLUME | CHN_N_TRIGGER;
if (flags & CHN_N_RATE) {
/*
* XXX I'll make good use of this someday.
* However this is currently being superseded by
* the availability of CHN_F_VCHAN_DYNAMIC.
*/
}
if (flags & CHN_N_FORMAT) {
/*
* XXX I'll make good use of this someday.
* However this is currently being superseded by
* the availability of CHN_F_VCHAN_DYNAMIC.
*/
}
if (flags & CHN_N_VOLUME) {
/*
* XXX I'll make good use of this someday, though
* soft volume control is currently pretty much
* integrated.
*/
}
if (flags & CHN_N_BLOCKSIZE) {
/*
* Set to default latency profile
*/
chn_setlatency(c, chn_latency);
}
if ((flags & CHN_N_TRIGGER) && !(c->flags & CHN_F_VCHAN_DYNAMIC)) {
nrun = CHN_EMPTY(c, children.busy) ? 0 : 1;
if (nrun && !run)
err = chn_start(c, 1);
if (!nrun && run)
chn_abort(c);
flags &= ~CHN_N_TRIGGER;
}
if (flags & CHN_N_TRIGGER) {
if (c->direction == PCMDIR_PLAY) {
vchanformat = &c->parentsnddev->pvchanformat;
vchanrate = &c->parentsnddev->pvchanrate;
} else {
vchanformat = &c->parentsnddev->rvchanformat;
vchanrate = &c->parentsnddev->rvchanrate;
}
/* Dynamic Virtual Channel */
if (!(c->flags & CHN_F_VCHAN_ADAPTIVE)) {
bestformat = *vchanformat;
bestspeed = *vchanrate;
} else {
bestformat = 0;
bestspeed = 0;
}
besthwformat = 0;
nrun = 0;
caps = chn_getcaps(c);
dirty = 0;
vpflags = 0;
CHN_FOREACH(ch, c, children.busy) {
CHN_LOCK(ch);
if ((ch->format & AFMT_PASSTHROUGH) &&
snd_fmtvalid(ch->format, caps->fmtlist)) {
bestformat = ch->format;
bestspeed = ch->speed;
CHN_UNLOCK(ch);
vpflags = CHN_F_PASSTHROUGH;
nrun++;
break;
}
if ((ch->flags & CHN_F_EXCLUSIVE) && vpflags == 0) {
if (c->flags & CHN_F_VCHAN_ADAPTIVE) {
bestspeed = ch->speed;
RANGE(bestspeed, caps->minspeed,
caps->maxspeed);
besthwformat = snd_fmtbest(ch->format,
caps->fmtlist);
if (besthwformat != 0)
bestformat = besthwformat;
}
CHN_UNLOCK(ch);
vpflags = CHN_F_EXCLUSIVE;
nrun++;
continue;
}
if (!(c->flags & CHN_F_VCHAN_ADAPTIVE) ||
vpflags != 0) {
CHN_UNLOCK(ch);
nrun++;
continue;
}
if (ch->speed > bestspeed) {
bestspeed = ch->speed;
RANGE(bestspeed, caps->minspeed,
caps->maxspeed);
}
besthwformat = snd_fmtbest(ch->format, caps->fmtlist);
if (!(besthwformat & AFMT_VCHAN)) {
CHN_UNLOCK(ch);
nrun++;
continue;
}
if (AFMT_CHANNEL(besthwformat) >
AFMT_CHANNEL(bestformat))
bestformat = besthwformat;
else if (AFMT_CHANNEL(besthwformat) ==
AFMT_CHANNEL(bestformat) &&
AFMT_BIT(besthwformat) > AFMT_BIT(bestformat))
bestformat = besthwformat;
CHN_UNLOCK(ch);
nrun++;
}
if (bestformat == 0)
bestformat = c->format;
if (bestspeed == 0)
bestspeed = c->speed;
if (bestformat != c->format || bestspeed != c->speed)
dirty = 1;
c->flags &= ~(CHN_F_PASSTHROUGH | CHN_F_EXCLUSIVE);
c->flags |= vpflags;
if (nrun && !run) {
if (dirty) {
bestspeed = CHANNEL_SETSPEED(c->methods,
c->devinfo, bestspeed);
err = chn_reset(c, bestformat, bestspeed);
}
if (err == 0 && dirty) {
CHN_FOREACH(ch, c, children.busy) {
CHN_LOCK(ch);
if (VCHAN_SYNC_REQUIRED(ch))
vchan_sync(ch);
CHN_UNLOCK(ch);
}
}
if (err == 0) {
if (dirty)
c->flags |= CHN_F_DIRTY;
err = chn_start(c, 1);
}
}
if (nrun && run && dirty) {
chn_abort(c);
bestspeed = CHANNEL_SETSPEED(c->methods, c->devinfo,
bestspeed);
err = chn_reset(c, bestformat, bestspeed);
if (err == 0) {
CHN_FOREACH(ch, c, children.busy) {
CHN_LOCK(ch);
if (VCHAN_SYNC_REQUIRED(ch))
vchan_sync(ch);
CHN_UNLOCK(ch);
}
}
if (err == 0) {
c->flags |= CHN_F_DIRTY;
err = chn_start(c, 1);
}
}
if (err == 0 && !(bestformat & AFMT_PASSTHROUGH) &&
(bestformat & AFMT_VCHAN)) {
*vchanformat = bestformat;
*vchanrate = bestspeed;
}
if (!nrun && run) {
c->flags &= ~(CHN_F_PASSTHROUGH | CHN_F_EXCLUSIVE);
bestformat = *vchanformat;
bestspeed = *vchanrate;
chn_abort(c);
if (c->format != bestformat || c->speed != bestspeed)
chn_reset(c, bestformat, bestspeed);
}
}
return (err);
}
/**
* @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;
}
#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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