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


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

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    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: releng/6.2/sys/dev/sound/pcm/buffer.c 153901 2005-12-30 19:55:55Z netchild $");
   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         free(b, M_DEVBUF);
   50 }
   51 
   52 bus_addr_t
   53 sndbuf_getbufaddr(struct snd_dbuf *buf)
   54 {
   55         return (buf->buf_addr);
   56 }
   57 
   58 static void
   59 sndbuf_setmap(void *arg, bus_dma_segment_t *segs, int nseg, int error)
   60 {
   61         struct snd_dbuf *b = (struct snd_dbuf *)arg;
   62 
   63         if (bootverbose) {
   64                 device_printf(b->dev, "sndbuf_setmap %lx, %lx; ",
   65                     (u_long)segs[0].ds_addr, (u_long)segs[0].ds_len);
   66                 printf("%p -> %lx\n", b->buf, (u_long)segs[0].ds_addr);
   67         }
   68         if (error == 0)
   69                 b->buf_addr = segs[0].ds_addr;
   70         else
   71                 b->buf_addr = 0;
   72 }
   73 
   74 /*
   75  * Allocate memory for DMA buffer. If the device does not use DMA transfers,
   76  * the driver can call malloc(9) and sndbuf_setup() itself.
   77  */
   78 
   79 int
   80 sndbuf_alloc(struct snd_dbuf *b, bus_dma_tag_t dmatag, unsigned int size)
   81 {
   82         int ret;
   83 
   84         b->dmatag = dmatag;
   85         b->maxsize = size;
   86         b->bufsize = b->maxsize;
   87         b->buf_addr = 0;
   88         if (bus_dmamem_alloc(b->dmatag, (void **)&b->buf, BUS_DMA_NOWAIT,
   89             &b->dmamap))
   90                 return (ENOMEM);
   91         if (bus_dmamap_load(b->dmatag, b->dmamap, b->buf, b->maxsize,
   92             sndbuf_setmap, b, 0) != 0 || b->buf_addr == 0) {
   93                 bus_dmamem_free(b->dmatag, b->buf, b->dmamap);
   94                 b->dmamap = NULL;
   95                 return (ENOMEM);
   96         }
   97 
   98         ret = sndbuf_resize(b, 2, b->maxsize / 2);
   99         if (ret != 0)
  100                 sndbuf_free(b);
  101         return (ret);
  102 }
  103 
  104 int
  105 sndbuf_setup(struct snd_dbuf *b, void *buf, unsigned int size)
  106 {
  107         b->buf = buf;
  108         b->maxsize = size;
  109         b->bufsize = b->maxsize;
  110         return sndbuf_resize(b, 2, b->maxsize / 2);
  111 }
  112 
  113 void
  114 sndbuf_free(struct snd_dbuf *b)
  115 {
  116         if (b->tmpbuf)
  117                 free(b->tmpbuf, M_DEVBUF);
  118         b->tmpbuf = NULL;
  119 
  120         if (b->dmamap)
  121                 bus_dmamap_unload(b->dmatag, b->dmamap);
  122 
  123         if (b->dmamap && b->buf)
  124                 bus_dmamem_free(b->dmatag, b->buf, b->dmamap);
  125         b->dmamap = NULL;
  126         b->buf = NULL;
  127 }
  128 
  129 int
  130 sndbuf_resize(struct snd_dbuf *b, unsigned int blkcnt, unsigned int blksz)
  131 {
  132         u_int8_t *tmpbuf, *f2;
  133 
  134         chn_lock(b->channel);
  135         if (b->maxsize == 0)
  136                 goto out;
  137         if (blkcnt == 0)
  138                 blkcnt = b->blkcnt;
  139         if (blksz == 0)
  140                 blksz = b->blksz;
  141         if (blkcnt < 2 || blksz < 16 || (blkcnt * blksz > b->maxsize)) {
  142                 chn_unlock(b->channel);
  143                 return EINVAL;
  144         }
  145         if (blkcnt == b->blkcnt && blksz == b->blksz)
  146                 goto out;
  147 
  148         chn_unlock(b->channel);
  149         tmpbuf = malloc(blkcnt * blksz, M_DEVBUF, M_NOWAIT);
  150         if (tmpbuf == NULL)
  151                 return ENOMEM;
  152         chn_lock(b->channel);
  153         b->blkcnt = blkcnt;
  154         b->blksz = blksz;
  155         b->bufsize = blkcnt * blksz;
  156         f2 =  b->tmpbuf;
  157         b->tmpbuf = tmpbuf;
  158         sndbuf_reset(b);
  159         chn_unlock(b->channel);
  160         free(f2, M_DEVBUF);
  161         return 0;
  162 out:
  163         chn_unlock(b->channel);
  164         return 0;
  165 }
  166 
  167 int
  168 sndbuf_remalloc(struct snd_dbuf *b, unsigned int blkcnt, unsigned int blksz)
  169 {
  170         u_int8_t *buf, *tmpbuf, *f1, *f2;
  171         unsigned int bufsize;
  172         int ret;
  173 
  174         if (blkcnt < 2 || blksz < 16)
  175                 return EINVAL;
  176 
  177         bufsize = blksz * blkcnt;
  178 
  179         chn_unlock(b->channel);
  180         buf = malloc(bufsize, M_DEVBUF, M_WAITOK);
  181         if (buf == NULL) {
  182                 ret = ENOMEM;
  183                 goto out;
  184         }
  185 
  186         tmpbuf = malloc(bufsize, M_DEVBUF, M_WAITOK);
  187         if (tmpbuf == NULL) {
  188                 free(buf, M_DEVBUF);
  189                 ret = ENOMEM;
  190                 goto out;
  191         }
  192         chn_lock(b->channel);
  193 
  194         b->blkcnt = blkcnt;
  195         b->blksz = blksz;
  196         b->bufsize = bufsize;
  197         b->maxsize = bufsize;
  198         f1 = b->buf;
  199         f2 = b->tmpbuf;
  200         b->buf = buf;
  201         b->tmpbuf = tmpbuf;
  202 
  203         sndbuf_reset(b);
  204 
  205         chn_unlock(b->channel);
  206         if (f1)
  207                 free(f1, M_DEVBUF);
  208         if (f2)
  209                 free(f2, M_DEVBUF);
  210 
  211         ret = 0;
  212 out:
  213         chn_lock(b->channel);
  214         return ret;
  215 }
  216 
  217 void
  218 sndbuf_clear(struct snd_dbuf *b, unsigned int length)
  219 {
  220         int i;
  221         u_char data, *p;
  222 
  223         if (length == 0)
  224                 return;
  225         if (length > b->bufsize)
  226                 length = b->bufsize;
  227 
  228         if (b->fmt & AFMT_SIGNED)
  229                 data = 0x00;
  230         else
  231                 data = 0x80;
  232 
  233         i = sndbuf_getfreeptr(b);
  234         p = sndbuf_getbuf(b);
  235         while (length > 0) {
  236                 p[i] = data;
  237                 length--;
  238                 i++;
  239                 if (i >= b->bufsize)
  240                         i = 0;
  241         }
  242 }
  243 
  244 void
  245 sndbuf_fillsilence(struct snd_dbuf *b)
  246 {
  247         int i;
  248         u_char data, *p;
  249 
  250         if (b->fmt & AFMT_SIGNED)
  251                 data = 0x00;
  252         else
  253                 data = 0x80;
  254 
  255         i = 0;
  256         p = sndbuf_getbuf(b);
  257         while (i < b->bufsize)
  258                 p[i++] = data;
  259         b->rp = 0;
  260         b->rl = b->bufsize;
  261 }
  262 
  263 void
  264 sndbuf_reset(struct snd_dbuf *b)
  265 {
  266         b->hp = 0;
  267         b->rp = 0;
  268         b->rl = 0;
  269         b->dl = 0;
  270         b->prev_total = 0;
  271         b->total = 0;
  272         b->xrun = 0;
  273         if (b->buf && b->bufsize > 0)
  274                 sndbuf_clear(b, b->bufsize);
  275 }
  276 
  277 u_int32_t
  278 sndbuf_getfmt(struct snd_dbuf *b)
  279 {
  280         return b->fmt;
  281 }
  282 
  283 int
  284 sndbuf_setfmt(struct snd_dbuf *b, u_int32_t fmt)
  285 {
  286         b->fmt = fmt;
  287         b->bps = 1;
  288         b->bps <<= (b->fmt & AFMT_STEREO)? 1 : 0;
  289         if (b->fmt & AFMT_16BIT)
  290                 b->bps <<= 1;
  291         else if (b->fmt & AFMT_24BIT)
  292                 b->bps *= 3;
  293         else if (b->fmt & AFMT_32BIT)
  294                 b->bps <<= 2;
  295         return 0;
  296 }
  297 
  298 unsigned int
  299 sndbuf_getspd(struct snd_dbuf *b)
  300 {
  301         return b->spd;
  302 }
  303 
  304 void
  305 sndbuf_setspd(struct snd_dbuf *b, unsigned int spd)
  306 {
  307         b->spd = spd;
  308 }
  309 
  310 unsigned int
  311 sndbuf_getalign(struct snd_dbuf *b)
  312 {
  313         static int align[] = {0, 1, 1, 2, 2, 2, 2, 3};
  314 
  315         return align[b->bps - 1];
  316 }
  317 
  318 unsigned int
  319 sndbuf_getblkcnt(struct snd_dbuf *b)
  320 {
  321         return b->blkcnt;
  322 }
  323 
  324 void
  325 sndbuf_setblkcnt(struct snd_dbuf *b, unsigned int blkcnt)
  326 {
  327         b->blkcnt = blkcnt;
  328 }
  329 
  330 unsigned int
  331 sndbuf_getblksz(struct snd_dbuf *b)
  332 {
  333         return b->blksz;
  334 }
  335 
  336 void
  337 sndbuf_setblksz(struct snd_dbuf *b, unsigned int blksz)
  338 {
  339         b->blksz = blksz;
  340 }
  341 
  342 unsigned int
  343 sndbuf_getbps(struct snd_dbuf *b)
  344 {
  345         return b->bps;
  346 }
  347 
  348 void *
  349 sndbuf_getbuf(struct snd_dbuf *b)
  350 {
  351         return b->buf;
  352 }
  353 
  354 void *
  355 sndbuf_getbufofs(struct snd_dbuf *b, unsigned int ofs)
  356 {
  357         KASSERT(ofs < b->bufsize, ("%s: ofs invalid %d", __func__, ofs));
  358 
  359         return b->buf + ofs;
  360 }
  361 
  362 unsigned int
  363 sndbuf_getsize(struct snd_dbuf *b)
  364 {
  365         return b->bufsize;
  366 }
  367 
  368 unsigned int
  369 sndbuf_getmaxsize(struct snd_dbuf *b)
  370 {
  371         return b->maxsize;
  372 }
  373 
  374 unsigned int
  375 sndbuf_runsz(struct snd_dbuf *b)
  376 {
  377         return b->dl;
  378 }
  379 
  380 void
  381 sndbuf_setrun(struct snd_dbuf *b, int go)
  382 {
  383         b->dl = go? b->blksz : 0;
  384 }
  385 
  386 struct selinfo *
  387 sndbuf_getsel(struct snd_dbuf *b)
  388 {
  389         return &b->sel;
  390 }
  391 
  392 /************************************************************/
  393 unsigned int
  394 sndbuf_getxrun(struct snd_dbuf *b)
  395 {
  396         SNDBUF_LOCKASSERT(b);
  397 
  398         return b->xrun;
  399 }
  400 
  401 void
  402 sndbuf_setxrun(struct snd_dbuf *b, unsigned int cnt)
  403 {
  404         SNDBUF_LOCKASSERT(b);
  405 
  406         b->xrun = cnt;
  407 }
  408 
  409 unsigned int
  410 sndbuf_gethwptr(struct snd_dbuf *b)
  411 {
  412         SNDBUF_LOCKASSERT(b);
  413 
  414         return b->hp;
  415 }
  416 
  417 void
  418 sndbuf_sethwptr(struct snd_dbuf *b, unsigned int ptr)
  419 {
  420         SNDBUF_LOCKASSERT(b);
  421 
  422         b->hp = ptr;
  423 }
  424 
  425 unsigned int
  426 sndbuf_getready(struct snd_dbuf *b)
  427 {
  428         SNDBUF_LOCKASSERT(b);
  429         KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d", __func__, b->rl));
  430 
  431         return b->rl;
  432 }
  433 
  434 unsigned int
  435 sndbuf_getreadyptr(struct snd_dbuf *b)
  436 {
  437         SNDBUF_LOCKASSERT(b);
  438         KASSERT((b->rp >= 0) && (b->rp <= b->bufsize), ("%s: b->rp invalid %d", __func__, b->rp));
  439 
  440         return b->rp;
  441 }
  442 
  443 unsigned int
  444 sndbuf_getfree(struct snd_dbuf *b)
  445 {
  446         SNDBUF_LOCKASSERT(b);
  447         KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d", __func__, b->rl));
  448 
  449         return b->bufsize - b->rl;
  450 }
  451 
  452 unsigned int
  453 sndbuf_getfreeptr(struct snd_dbuf *b)
  454 {
  455         SNDBUF_LOCKASSERT(b);
  456         KASSERT((b->rp >= 0) && (b->rp <= b->bufsize), ("%s: b->rp invalid %d", __func__, b->rp));
  457         KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d", __func__, b->rl));
  458 
  459         return (b->rp + b->rl) % b->bufsize;
  460 }
  461 
  462 unsigned int
  463 sndbuf_getblocks(struct snd_dbuf *b)
  464 {
  465         SNDBUF_LOCKASSERT(b);
  466 
  467         return b->total / b->blksz;
  468 }
  469 
  470 unsigned int
  471 sndbuf_getprevblocks(struct snd_dbuf *b)
  472 {
  473         SNDBUF_LOCKASSERT(b);
  474 
  475         return b->prev_total / b->blksz;
  476 }
  477 
  478 unsigned int
  479 sndbuf_gettotal(struct snd_dbuf *b)
  480 {
  481         SNDBUF_LOCKASSERT(b);
  482 
  483         return b->total;
  484 }
  485 
  486 void
  487 sndbuf_updateprevtotal(struct snd_dbuf *b)
  488 {
  489         SNDBUF_LOCKASSERT(b);
  490 
  491         b->prev_total = b->total;
  492 }
  493 
  494 /************************************************************/
  495 
  496 int
  497 sndbuf_acquire(struct snd_dbuf *b, u_int8_t *from, unsigned int count)
  498 {
  499         int l;
  500 
  501         KASSERT(count <= sndbuf_getfree(b), ("%s: count %d > free %d", __func__, count, sndbuf_getfree(b)));
  502         KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d", __func__, b->rl));
  503         b->total += count;
  504         if (from != NULL) {
  505                 while (count > 0) {
  506                         l = MIN(count, sndbuf_getsize(b) - sndbuf_getfreeptr(b));
  507                         bcopy(from, sndbuf_getbufofs(b, sndbuf_getfreeptr(b)), l);
  508                         from += l;
  509                         b->rl += l;
  510                         count -= l;
  511                 }
  512         } else
  513                 b->rl += count;
  514         KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d, count %d", __func__, b->rl, count));
  515 
  516         return 0;
  517 }
  518 
  519 int
  520 sndbuf_dispose(struct snd_dbuf *b, u_int8_t *to, unsigned int count)
  521 {
  522         int l;
  523 
  524         KASSERT(count <= sndbuf_getready(b), ("%s: count %d > ready %d", __func__, count, sndbuf_getready(b)));
  525         KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d", __func__, b->rl));
  526         if (to != NULL) {
  527                 while (count > 0) {
  528                         l = MIN(count, sndbuf_getsize(b) - sndbuf_getreadyptr(b));
  529                         bcopy(sndbuf_getbufofs(b, sndbuf_getreadyptr(b)), to, l);
  530                         to += l;
  531                         b->rl -= l;
  532                         b->rp = (b->rp + l) % b->bufsize;
  533                         count -= l;
  534                 }
  535         } else {
  536                 b->rl -= count;
  537                 b->rp = (b->rp + count) % b->bufsize;
  538         }
  539         KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d, count %d", __func__, b->rl, count));
  540 
  541         return 0;
  542 }
  543 
  544 /* count is number of bytes we want added to destination buffer */
  545 int
  546 sndbuf_feed(struct snd_dbuf *from, struct snd_dbuf *to, struct pcm_channel *channel, struct pcm_feeder *feeder, unsigned int count)
  547 {
  548         KASSERT(count > 0, ("can't feed 0 bytes"));
  549 
  550         if (sndbuf_getfree(to) < count)
  551                 return EINVAL;
  552 
  553         count = FEEDER_FEED(feeder, channel, to->tmpbuf, count, from);
  554         if (count)
  555                 sndbuf_acquire(to, to->tmpbuf, count);
  556         /* the root feeder has called sndbuf_dispose(from, , bytes fetched) */
  557 
  558         return 0;
  559 }
  560 
  561 /************************************************************/
  562 
  563 void
  564 sndbuf_dump(struct snd_dbuf *b, char *s, u_int32_t what)
  565 {
  566         printf("%s: [", s);
  567         if (what & 0x01)
  568                 printf(" bufsize: %d, maxsize: %d", b->bufsize, b->maxsize);
  569         if (what & 0x02)
  570                 printf(" dl: %d, rp: %d, rl: %d, hp: %d", b->dl, b->rp, b->rl, b->hp);
  571         if (what & 0x04)
  572                 printf(" total: %d, prev_total: %d, xrun: %d", b->total, b->prev_total, b->xrun);
  573         if (what & 0x08)
  574                 printf(" fmt: 0x%x, spd: %d", b->fmt, b->spd);
  575         if (what & 0x10)
  576                 printf(" blksz: %d, blkcnt: %d, flags: 0x%x", b->blksz, b->blkcnt, b->flags);
  577         printf(" ]\n");
  578 }
  579 
  580 /************************************************************/
  581 u_int32_t
  582 sndbuf_getflags(struct snd_dbuf *b)
  583 {
  584         return b->flags;
  585 }
  586 
  587 void
  588 sndbuf_setflags(struct snd_dbuf *b, u_int32_t flags, int on)
  589 {
  590         b->flags &= ~flags;
  591         if (on)
  592                 b->flags |= flags;
  593 }
  594 

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