The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

FreeBSD/Linux Kernel Cross Reference
sys/dev/sound/pcm/buffer.c

Version: -  FREEBSD  -  FREEBSD-12-STABLE  -  FREEBSD-12-0  -  FREEBSD-11-STABLE  -  FREEBSD-11-2  -  FREEBSD-11-1  -  FREEBSD-11-0  -  FREEBSD-10-STABLE  -  FREEBSD-10-4  -  FREEBSD-10-3  -  FREEBSD-10-2  -  FREEBSD-10-1  -  FREEBSD-10-0  -  FREEBSD-9-STABLE  -  FREEBSD-9-3  -  FREEBSD-9-2  -  FREEBSD-9-1  -  FREEBSD-9-0  -  FREEBSD-8-STABLE  -  FREEBSD-8-4  -  FREEBSD-8-3  -  FREEBSD-8-2  -  FREEBSD-8-1  -  FREEBSD-8-0  -  FREEBSD-7-STABLE  -  FREEBSD-7-4  -  FREEBSD-7-3  -  FREEBSD-7-2  -  FREEBSD-7-1  -  FREEBSD-7-0  -  FREEBSD-6-STABLE  -  FREEBSD-6-4  -  FREEBSD-6-3  -  FREEBSD-6-2  -  FREEBSD-6-1  -  FREEBSD-6-0  -  FREEBSD-5-STABLE  -  FREEBSD-5-5  -  FREEBSD-5-4  -  FREEBSD-5-3  -  FREEBSD-5-2  -  FREEBSD-5-1  -  FREEBSD-5-0  -  FREEBSD-4-STABLE  -  FREEBSD-3-STABLE  -  FREEBSD22  -  linux-2.6  -  linux-2.4.22  -  MK83  -  MK84  -  PLAN9  -  DFBSD  -  NETBSD  -  NETBSD5  -  NETBSD4  -  NETBSD3  -  NETBSD20  -  OPENBSD  -  xnu-517  -  xnu-792  -  xnu-792.6.70  -  xnu-1228  -  xnu-1456.1.26  -  xnu-1699.24.8  -  xnu-2050.18.24  -  OPENSOLARIS  -  minix-3-1-1 
SearchContext: -  none  -  3  -  10 

    1 /*-
    2  * Copyright (c) 1999 Cameron Grant <cg@freebsd.org>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 #include <dev/sound/pcm/sound.h>
   28 
   29 #include "feeder_if.h"
   30 
   31 SND_DECLARE_FILE("$FreeBSD$");
   32 
   33 struct snd_dbuf *
   34 sndbuf_create(device_t dev, char *drv, char *desc, struct pcm_channel *channel)
   35 {
   36         struct snd_dbuf *b;
   37 
   38         b = malloc(sizeof(*b), M_DEVBUF, M_WAITOK | M_ZERO);
   39         snprintf(b->name, SNDBUF_NAMELEN, "%s:%s", drv, desc);
   40         b->dev = dev;
   41         b->channel = channel;
   42 
   43         return b;
   44 }
   45 
   46 void
   47 sndbuf_destroy(struct snd_dbuf *b)
   48 {
   49         sndbuf_free(b);
   50         free(b, M_DEVBUF);
   51 }
   52 
   53 bus_addr_t
   54 sndbuf_getbufaddr(struct snd_dbuf *buf)
   55 {
   56         return (buf->buf_addr);
   57 }
   58 
   59 static void
   60 sndbuf_setmap(void *arg, bus_dma_segment_t *segs, int nseg, int error)
   61 {
   62         struct snd_dbuf *b = (struct snd_dbuf *)arg;
   63 
   64         if (bootverbose) {
   65                 device_printf(b->dev, "sndbuf_setmap %lx, %lx; ",
   66                     (u_long)segs[0].ds_addr, (u_long)segs[0].ds_len);
   67                 printf("%p -> %lx\n", b->buf, (u_long)segs[0].ds_addr);
   68         }
   69         if (error == 0)
   70                 b->buf_addr = segs[0].ds_addr;
   71         else
   72                 b->buf_addr = 0;
   73 }
   74 
   75 /*
   76  * Allocate memory for DMA buffer. If the device does not use DMA transfers,
   77  * the driver can call malloc(9) and sndbuf_setup() itself.
   78  */
   79 
   80 int
   81 sndbuf_alloc(struct snd_dbuf *b, bus_dma_tag_t dmatag, unsigned int size)
   82 {
   83         int ret;
   84 
   85         b->dmatag = dmatag;
   86         b->maxsize = size;
   87         b->bufsize = b->maxsize;
   88         b->buf_addr = 0;
   89         b->flags |= SNDBUF_F_MANAGED;
   90         if (bus_dmamem_alloc(b->dmatag, (void **)&b->buf, BUS_DMA_NOWAIT,
   91             &b->dmamap)) {
   92                 sndbuf_free(b);
   93                 return (ENOMEM);
   94         }
   95         if (bus_dmamap_load(b->dmatag, b->dmamap, b->buf, b->maxsize,
   96             sndbuf_setmap, b, 0) != 0 || b->buf_addr == 0) {
   97                 sndbuf_free(b);
   98                 return (ENOMEM);
   99         }
  100 
  101         ret = sndbuf_resize(b, 2, b->maxsize / 2);
  102         if (ret != 0)
  103                 sndbuf_free(b);
  104 
  105         return (ret);
  106 }
  107 
  108 int
  109 sndbuf_setup(struct snd_dbuf *b, void *buf, unsigned int size)
  110 {
  111         b->flags &= ~SNDBUF_F_MANAGED;
  112         if (buf)
  113                 b->flags |= SNDBUF_F_MANAGED;
  114         b->buf = buf;
  115         b->maxsize = size;
  116         b->bufsize = b->maxsize;
  117         return sndbuf_resize(b, 2, b->maxsize / 2);
  118 }
  119 
  120 void
  121 sndbuf_free(struct snd_dbuf *b)
  122 {
  123         if (b->tmpbuf)
  124                 free(b->tmpbuf, M_DEVBUF);
  125 
  126         if (b->buf) {
  127                 if (b->flags & SNDBUF_F_MANAGED) {
  128                         if (b->dmamap)
  129                                 bus_dmamap_unload(b->dmatag, b->dmamap);
  130                         if (b->dmatag)
  131                                 bus_dmamem_free(b->dmatag, b->buf, b->dmamap);
  132                 } else
  133                         free(b->buf, M_DEVBUF);
  134         }
  135 
  136         b->tmpbuf = NULL;
  137         b->buf = NULL;
  138         b->dmatag = NULL;
  139         b->dmamap = NULL;
  140 }
  141 
  142 int
  143 sndbuf_resize(struct snd_dbuf *b, unsigned int blkcnt, unsigned int blksz)
  144 {
  145         u_int8_t *tmpbuf, *f2;
  146 
  147         chn_lock(b->channel);
  148         if (b->maxsize == 0)
  149                 goto out;
  150         if (blkcnt == 0)
  151                 blkcnt = b->blkcnt;
  152         if (blksz == 0)
  153                 blksz = b->blksz;
  154         if (blkcnt < 2 || blksz < 16 || (blkcnt * blksz > b->maxsize)) {
  155                 chn_unlock(b->channel);
  156                 return EINVAL;
  157         }
  158         if (blkcnt == b->blkcnt && blksz == b->blksz)
  159                 goto out;
  160 
  161         chn_unlock(b->channel);
  162         tmpbuf = malloc(blkcnt * blksz, M_DEVBUF, M_NOWAIT);
  163         if (tmpbuf == NULL)
  164                 return ENOMEM;
  165         chn_lock(b->channel);
  166         b->blkcnt = blkcnt;
  167         b->blksz = blksz;
  168         b->bufsize = blkcnt * blksz;
  169         f2 =  b->tmpbuf;
  170         b->tmpbuf = tmpbuf;
  171         sndbuf_reset(b);
  172         chn_unlock(b->channel);
  173         free(f2, M_DEVBUF);
  174         return 0;
  175 out:
  176         chn_unlock(b->channel);
  177         return 0;
  178 }
  179 
  180 int
  181 sndbuf_remalloc(struct snd_dbuf *b, unsigned int blkcnt, unsigned int blksz)
  182 {
  183         u_int8_t *buf, *tmpbuf, *f1, *f2;
  184         unsigned int bufsize;
  185         int ret;
  186 
  187         if (blkcnt < 2 || blksz < 16)
  188                 return EINVAL;
  189 
  190         bufsize = blksz * blkcnt;
  191 
  192         chn_unlock(b->channel);
  193         buf = malloc(bufsize, M_DEVBUF, M_WAITOK);
  194         if (buf == NULL) {
  195                 ret = ENOMEM;
  196                 goto out;
  197         }
  198 
  199         tmpbuf = malloc(bufsize, M_DEVBUF, M_WAITOK);
  200         if (tmpbuf == NULL) {
  201                 free(buf, M_DEVBUF);
  202                 ret = ENOMEM;
  203                 goto out;
  204         }
  205         chn_lock(b->channel);
  206 
  207         b->blkcnt = blkcnt;
  208         b->blksz = blksz;
  209         b->bufsize = bufsize;
  210         b->maxsize = bufsize;
  211         f1 = b->buf;
  212         f2 = b->tmpbuf;
  213         b->buf = buf;
  214         b->tmpbuf = tmpbuf;
  215 
  216         sndbuf_reset(b);
  217 
  218         chn_unlock(b->channel);
  219         if (f1)
  220                 free(f1, M_DEVBUF);
  221         if (f2)
  222                 free(f2, M_DEVBUF);
  223 
  224         ret = 0;
  225 out:
  226         chn_lock(b->channel);
  227         return ret;
  228 }
  229 
  230 void
  231 sndbuf_clear(struct snd_dbuf *b, unsigned int length)
  232 {
  233         int i;
  234         u_char data, *p;
  235 
  236         if (length == 0)
  237                 return;
  238         if (length > b->bufsize)
  239                 length = b->bufsize;
  240 
  241         if (b->fmt & AFMT_SIGNED)
  242                 data = 0x00;
  243         else
  244                 data = 0x80;
  245 
  246         i = sndbuf_getfreeptr(b);
  247         p = sndbuf_getbuf(b);
  248         while (length > 0) {
  249                 p[i] = data;
  250                 length--;
  251                 i++;
  252                 if (i >= b->bufsize)
  253                         i = 0;
  254         }
  255 }
  256 
  257 void
  258 sndbuf_fillsilence(struct snd_dbuf *b)
  259 {
  260         int i;
  261         u_char data, *p;
  262 
  263         if (b->fmt & AFMT_SIGNED)
  264                 data = 0x00;
  265         else
  266                 data = 0x80;
  267 
  268         i = 0;
  269         p = sndbuf_getbuf(b);
  270         while (i < b->bufsize)
  271                 p[i++] = data;
  272         b->rp = 0;
  273         b->rl = b->bufsize;
  274 }
  275 
  276 void
  277 sndbuf_reset(struct snd_dbuf *b)
  278 {
  279         b->hp = 0;
  280         b->rp = 0;
  281         b->rl = 0;
  282         b->dl = 0;
  283         b->prev_total = 0;
  284         b->total = 0;
  285         b->xrun = 0;
  286         if (b->buf && b->bufsize > 0)
  287                 sndbuf_clear(b, b->bufsize);
  288 }
  289 
  290 u_int32_t
  291 sndbuf_getfmt(struct snd_dbuf *b)
  292 {
  293         return b->fmt;
  294 }
  295 
  296 int
  297 sndbuf_setfmt(struct snd_dbuf *b, u_int32_t fmt)
  298 {
  299         b->fmt = fmt;
  300         b->bps = 1;
  301         b->bps <<= (b->fmt & AFMT_STEREO)? 1 : 0;
  302         if (b->fmt & AFMT_16BIT)
  303                 b->bps <<= 1;
  304         else if (b->fmt & AFMT_24BIT)
  305                 b->bps *= 3;
  306         else if (b->fmt & AFMT_32BIT)
  307                 b->bps <<= 2;
  308         return 0;
  309 }
  310 
  311 unsigned int
  312 sndbuf_getspd(struct snd_dbuf *b)
  313 {
  314         return b->spd;
  315 }
  316 
  317 void
  318 sndbuf_setspd(struct snd_dbuf *b, unsigned int spd)
  319 {
  320         b->spd = spd;
  321 }
  322 
  323 unsigned int
  324 sndbuf_getalign(struct snd_dbuf *b)
  325 {
  326         static int align[] = {0, 1, 1, 2, 2, 2, 2, 3};
  327 
  328         return align[b->bps - 1];
  329 }
  330 
  331 unsigned int
  332 sndbuf_getblkcnt(struct snd_dbuf *b)
  333 {
  334         return b->blkcnt;
  335 }
  336 
  337 void
  338 sndbuf_setblkcnt(struct snd_dbuf *b, unsigned int blkcnt)
  339 {
  340         b->blkcnt = blkcnt;
  341 }
  342 
  343 unsigned int
  344 sndbuf_getblksz(struct snd_dbuf *b)
  345 {
  346         return b->blksz;
  347 }
  348 
  349 void
  350 sndbuf_setblksz(struct snd_dbuf *b, unsigned int blksz)
  351 {
  352         b->blksz = blksz;
  353 }
  354 
  355 unsigned int
  356 sndbuf_getbps(struct snd_dbuf *b)
  357 {
  358         return b->bps;
  359 }
  360 
  361 void *
  362 sndbuf_getbuf(struct snd_dbuf *b)
  363 {
  364         return b->buf;
  365 }
  366 
  367 void *
  368 sndbuf_getbufofs(struct snd_dbuf *b, unsigned int ofs)
  369 {
  370         KASSERT(ofs < b->bufsize, ("%s: ofs invalid %d", __func__, ofs));
  371 
  372         return b->buf + ofs;
  373 }
  374 
  375 unsigned int
  376 sndbuf_getsize(struct snd_dbuf *b)
  377 {
  378         return b->bufsize;
  379 }
  380 
  381 unsigned int
  382 sndbuf_getmaxsize(struct snd_dbuf *b)
  383 {
  384         return b->maxsize;
  385 }
  386 
  387 unsigned int
  388 sndbuf_runsz(struct snd_dbuf *b)
  389 {
  390         return b->dl;
  391 }
  392 
  393 void
  394 sndbuf_setrun(struct snd_dbuf *b, int go)
  395 {
  396         b->dl = go? b->blksz : 0;
  397 }
  398 
  399 struct selinfo *
  400 sndbuf_getsel(struct snd_dbuf *b)
  401 {
  402         return &b->sel;
  403 }
  404 
  405 /************************************************************/
  406 unsigned int
  407 sndbuf_getxrun(struct snd_dbuf *b)
  408 {
  409         SNDBUF_LOCKASSERT(b);
  410 
  411         return b->xrun;
  412 }
  413 
  414 void
  415 sndbuf_setxrun(struct snd_dbuf *b, unsigned int cnt)
  416 {
  417         SNDBUF_LOCKASSERT(b);
  418 
  419         b->xrun = cnt;
  420 }
  421 
  422 unsigned int
  423 sndbuf_gethwptr(struct snd_dbuf *b)
  424 {
  425         SNDBUF_LOCKASSERT(b);
  426 
  427         return b->hp;
  428 }
  429 
  430 void
  431 sndbuf_sethwptr(struct snd_dbuf *b, unsigned int ptr)
  432 {
  433         SNDBUF_LOCKASSERT(b);
  434 
  435         b->hp = ptr;
  436 }
  437 
  438 unsigned int
  439 sndbuf_getready(struct snd_dbuf *b)
  440 {
  441         SNDBUF_LOCKASSERT(b);
  442         KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d", __func__, b->rl));
  443 
  444         return b->rl;
  445 }
  446 
  447 unsigned int
  448 sndbuf_getreadyptr(struct snd_dbuf *b)
  449 {
  450         SNDBUF_LOCKASSERT(b);
  451         KASSERT((b->rp >= 0) && (b->rp <= b->bufsize), ("%s: b->rp invalid %d", __func__, b->rp));
  452 
  453         return b->rp;
  454 }
  455 
  456 unsigned int
  457 sndbuf_getfree(struct snd_dbuf *b)
  458 {
  459         SNDBUF_LOCKASSERT(b);
  460         KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d", __func__, b->rl));
  461 
  462         return b->bufsize - b->rl;
  463 }
  464 
  465 unsigned int
  466 sndbuf_getfreeptr(struct snd_dbuf *b)
  467 {
  468         SNDBUF_LOCKASSERT(b);
  469         KASSERT((b->rp >= 0) && (b->rp <= b->bufsize), ("%s: b->rp invalid %d", __func__, b->rp));
  470         KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d", __func__, b->rl));
  471 
  472         return (b->rp + b->rl) % b->bufsize;
  473 }
  474 
  475 unsigned int
  476 sndbuf_getblocks(struct snd_dbuf *b)
  477 {
  478         SNDBUF_LOCKASSERT(b);
  479 
  480         return b->total / b->blksz;
  481 }
  482 
  483 unsigned int
  484 sndbuf_getprevblocks(struct snd_dbuf *b)
  485 {
  486         SNDBUF_LOCKASSERT(b);
  487 
  488         return b->prev_total / b->blksz;
  489 }
  490 
  491 unsigned int
  492 sndbuf_gettotal(struct snd_dbuf *b)
  493 {
  494         SNDBUF_LOCKASSERT(b);
  495 
  496         return b->total;
  497 }
  498 
  499 void
  500 sndbuf_updateprevtotal(struct snd_dbuf *b)
  501 {
  502         SNDBUF_LOCKASSERT(b);
  503 
  504         b->prev_total = b->total;
  505 }
  506 
  507 /************************************************************/
  508 
  509 int
  510 sndbuf_acquire(struct snd_dbuf *b, u_int8_t *from, unsigned int count)
  511 {
  512         int l;
  513 
  514         KASSERT(count <= sndbuf_getfree(b), ("%s: count %d > free %d", __func__, count, sndbuf_getfree(b)));
  515         KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d", __func__, b->rl));
  516         b->total += count;
  517         if (from != NULL) {
  518                 while (count > 0) {
  519                         l = MIN(count, sndbuf_getsize(b) - sndbuf_getfreeptr(b));
  520                         bcopy(from, sndbuf_getbufofs(b, sndbuf_getfreeptr(b)), l);
  521                         from += l;
  522                         b->rl += l;
  523                         count -= l;
  524                 }
  525         } else
  526                 b->rl += count;
  527         KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d, count %d", __func__, b->rl, count));
  528 
  529         return 0;
  530 }
  531 
  532 int
  533 sndbuf_dispose(struct snd_dbuf *b, u_int8_t *to, unsigned int count)
  534 {
  535         int l;
  536 
  537         KASSERT(count <= sndbuf_getready(b), ("%s: count %d > ready %d", __func__, count, sndbuf_getready(b)));
  538         KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d", __func__, b->rl));
  539         if (to != NULL) {
  540                 while (count > 0) {
  541                         l = MIN(count, sndbuf_getsize(b) - sndbuf_getreadyptr(b));
  542                         bcopy(sndbuf_getbufofs(b, sndbuf_getreadyptr(b)), to, l);
  543                         to += l;
  544                         b->rl -= l;
  545                         b->rp = (b->rp + l) % b->bufsize;
  546                         count -= l;
  547                 }
  548         } else {
  549                 b->rl -= count;
  550                 b->rp = (b->rp + count) % b->bufsize;
  551         }
  552         KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d, count %d", __func__, b->rl, count));
  553 
  554         return 0;
  555 }
  556 
  557 /* count is number of bytes we want added to destination buffer */
  558 int
  559 sndbuf_feed(struct snd_dbuf *from, struct snd_dbuf *to, struct pcm_channel *channel, struct pcm_feeder *feeder, unsigned int count)
  560 {
  561         KASSERT(count > 0, ("can't feed 0 bytes"));
  562 
  563         if (sndbuf_getfree(to) < count)
  564                 return EINVAL;
  565 
  566         count = FEEDER_FEED(feeder, channel, to->tmpbuf, count, from);
  567         if (count)
  568                 sndbuf_acquire(to, to->tmpbuf, count);
  569         /* the root feeder has called sndbuf_dispose(from, , bytes fetched) */
  570 
  571         return 0;
  572 }
  573 
  574 /************************************************************/
  575 
  576 void
  577 sndbuf_dump(struct snd_dbuf *b, char *s, u_int32_t what)
  578 {
  579         printf("%s: [", s);
  580         if (what & 0x01)
  581                 printf(" bufsize: %d, maxsize: %d", b->bufsize, b->maxsize);
  582         if (what & 0x02)
  583                 printf(" dl: %d, rp: %d, rl: %d, hp: %d", b->dl, b->rp, b->rl, b->hp);
  584         if (what & 0x04)
  585                 printf(" total: %d, prev_total: %d, xrun: %d", b->total, b->prev_total, b->xrun);
  586         if (what & 0x08)
  587                 printf(" fmt: 0x%x, spd: %d", b->fmt, b->spd);
  588         if (what & 0x10)
  589                 printf(" blksz: %d, blkcnt: %d, flags: 0x%x", b->blksz, b->blkcnt, b->flags);
  590         printf(" ]\n");
  591 }
  592 
  593 /************************************************************/
  594 u_int32_t
  595 sndbuf_getflags(struct snd_dbuf *b)
  596 {
  597         return b->flags;
  598 }
  599 
  600 void
  601 sndbuf_setflags(struct snd_dbuf *b, u_int32_t flags, int on)
  602 {
  603         b->flags &= ~flags;
  604         if (on)
  605                 b->flags |= flags;
  606 }
  607 

Cache object: f882ee2060b73d91c13430c4dbc011fe


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]


This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.