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/5.3/sys/dev/sound/pcm/buffer.c 128730 2004-04-29 02:51:59Z green $");
   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; ", (unsigned long)segs->ds_addr,
   65                        (unsigned long)segs->ds_len);
   66                 printf("%p -> %lx\n", b->buf, (unsigned long)vtophys(b->buf));
   67         }
   68         b->buf_addr = segs->ds_addr;
   69 }
   70 
   71 /*
   72  * Allocate memory for DMA buffer. If the device does not use DMA transfers,
   73  * the driver can call malloc(9) and sndbuf_setup() itself.
   74  */
   75 
   76 int
   77 sndbuf_alloc(struct snd_dbuf *b, bus_dma_tag_t dmatag, unsigned int size)
   78 {
   79         b->dmatag = dmatag;
   80         b->maxsize = size;
   81         b->bufsize = b->maxsize;
   82         if (bus_dmamem_alloc(b->dmatag, (void **)&b->buf, BUS_DMA_NOWAIT, &b->dmamap))
   83                 return ENOSPC;
   84         if (bus_dmamap_load(b->dmatag, b->dmamap, b->buf, b->maxsize, sndbuf_setmap, b, 0))
   85                 return ENOSPC;
   86         return sndbuf_resize(b, 2, b->maxsize / 2);
   87 }
   88 
   89 int
   90 sndbuf_setup(struct snd_dbuf *b, void *buf, unsigned int size)
   91 {
   92         b->buf = buf;
   93         b->maxsize = size;
   94         b->bufsize = b->maxsize;
   95         return sndbuf_resize(b, 2, b->maxsize / 2);
   96 }
   97 
   98 void
   99 sndbuf_free(struct snd_dbuf *b)
  100 {
  101         if (b->tmpbuf)
  102                 free(b->tmpbuf, M_DEVBUF);
  103         b->tmpbuf = NULL;
  104 
  105         if (b->dmamap)
  106                 bus_dmamap_unload(b->dmatag, b->dmamap);
  107 
  108         if (b->dmamap && b->buf)
  109                 bus_dmamem_free(b->dmatag, b->buf, b->dmamap);
  110         b->dmamap = NULL;
  111         b->buf = NULL;
  112 }
  113 
  114 int
  115 sndbuf_resize(struct snd_dbuf *b, unsigned int blkcnt, unsigned int blksz)
  116 {
  117         u_int8_t *tmpbuf, *f2;
  118 
  119         chn_lock(b->channel);
  120         if (b->maxsize == 0)
  121                 goto out;
  122         if (blkcnt == 0)
  123                 blkcnt = b->blkcnt;
  124         if (blksz == 0)
  125                 blksz = b->blksz;
  126         if (blkcnt < 2 || blksz < 16 || (blkcnt * blksz > b->maxsize)) {
  127                 chn_unlock(b->channel);
  128                 return EINVAL;
  129         }
  130         if (blkcnt == b->blkcnt && blksz == b->blksz)
  131                 goto out;
  132 
  133         chn_unlock(b->channel);
  134         tmpbuf = malloc(blkcnt * blksz, M_DEVBUF, M_NOWAIT);
  135         if (tmpbuf == NULL)
  136                 return ENOMEM;
  137         chn_lock(b->channel);
  138         b->blkcnt = blkcnt;
  139         b->blksz = blksz;
  140         b->bufsize = blkcnt * blksz;
  141         f2 =  b->tmpbuf;
  142         b->tmpbuf = tmpbuf;
  143         sndbuf_reset(b);
  144         chn_unlock(b->channel);
  145         free(f2, M_DEVBUF);
  146         return 0;
  147 out:
  148         chn_unlock(b->channel);
  149         return 0;
  150 }
  151 
  152 int
  153 sndbuf_remalloc(struct snd_dbuf *b, unsigned int blkcnt, unsigned int blksz)
  154 {
  155         u_int8_t *buf, *tmpbuf, *f1, *f2;
  156         unsigned int bufsize;
  157         int ret;
  158 
  159         if (blkcnt < 2 || blksz < 16)
  160                 return EINVAL;
  161 
  162         bufsize = blksz * blkcnt;
  163 
  164         chn_unlock(b->channel);
  165         buf = malloc(bufsize, M_DEVBUF, M_WAITOK);
  166         if (buf == NULL) {
  167                 ret = ENOMEM;
  168                 goto out;
  169         }
  170 
  171         tmpbuf = malloc(bufsize, M_DEVBUF, M_WAITOK);
  172         if (tmpbuf == NULL) {
  173                 free(buf, M_DEVBUF);
  174                 ret = ENOMEM;
  175                 goto out;
  176         }
  177         chn_lock(b->channel);
  178 
  179         b->blkcnt = blkcnt;
  180         b->blksz = blksz;
  181         b->bufsize = bufsize;
  182         b->maxsize = bufsize;
  183         f1 = b->buf;
  184         f2 = b->tmpbuf;
  185         b->buf = buf;
  186         b->tmpbuf = tmpbuf;
  187 
  188         sndbuf_reset(b);
  189 
  190         chn_unlock(b->channel);
  191         if (f1)
  192                 free(f1, M_DEVBUF);
  193         if (f2)
  194                 free(f2, M_DEVBUF);
  195 
  196         ret = 0;
  197 out:
  198         chn_lock(b->channel);
  199         return ret;
  200 }
  201 
  202 void
  203 sndbuf_clear(struct snd_dbuf *b, unsigned int length)
  204 {
  205         int i;
  206         u_char data, *p;
  207 
  208         if (length == 0)
  209                 return;
  210         if (length > b->bufsize)
  211                 length = b->bufsize;
  212 
  213         if (b->fmt & AFMT_SIGNED)
  214                 data = 0x00;
  215         else
  216                 data = 0x80;
  217 
  218         i = sndbuf_getfreeptr(b);
  219         p = sndbuf_getbuf(b);
  220         while (length > 0) {
  221                 p[i] = data;
  222                 length--;
  223                 i++;
  224                 if (i >= b->bufsize)
  225                         i = 0;
  226         }
  227 }
  228 
  229 void
  230 sndbuf_fillsilence(struct snd_dbuf *b)
  231 {
  232         int i;
  233         u_char data, *p;
  234 
  235         if (b->fmt & AFMT_SIGNED)
  236                 data = 0x00;
  237         else
  238                 data = 0x80;
  239 
  240         i = 0;
  241         p = sndbuf_getbuf(b);
  242         while (i < b->bufsize)
  243                 p[i++] = data;
  244         b->rp = 0;
  245         b->rl = b->bufsize;
  246 }
  247 
  248 void
  249 sndbuf_reset(struct snd_dbuf *b)
  250 {
  251         b->hp = 0;
  252         b->rp = 0;
  253         b->rl = 0;
  254         b->dl = 0;
  255         b->prev_total = 0;
  256         b->total = 0;
  257         b->xrun = 0;
  258         if (b->buf && b->bufsize > 0)
  259                 sndbuf_clear(b, b->bufsize);
  260 }
  261 
  262 u_int32_t
  263 sndbuf_getfmt(struct snd_dbuf *b)
  264 {
  265         return b->fmt;
  266 }
  267 
  268 int
  269 sndbuf_setfmt(struct snd_dbuf *b, u_int32_t fmt)
  270 {
  271         b->fmt = fmt;
  272         b->bps = 1;
  273         b->bps <<= (b->fmt & AFMT_STEREO)? 1 : 0;
  274         b->bps <<= (b->fmt & AFMT_16BIT)? 1 : 0;
  275         b->bps <<= (b->fmt & AFMT_32BIT)? 2 : 0;
  276         return 0;
  277 }
  278 
  279 unsigned int
  280 sndbuf_getspd(struct snd_dbuf *b)
  281 {
  282         return b->spd;
  283 }
  284 
  285 void
  286 sndbuf_setspd(struct snd_dbuf *b, unsigned int spd)
  287 {
  288         b->spd = spd;
  289 }
  290 
  291 unsigned int
  292 sndbuf_getalign(struct snd_dbuf *b)
  293 {
  294         static int align[] = {0, 1, 1, 2, 2, 2, 2, 3};
  295 
  296         return align[b->bps - 1];
  297 }
  298 
  299 unsigned int
  300 sndbuf_getblkcnt(struct snd_dbuf *b)
  301 {
  302         return b->blkcnt;
  303 }
  304 
  305 void
  306 sndbuf_setblkcnt(struct snd_dbuf *b, unsigned int blkcnt)
  307 {
  308         b->blkcnt = blkcnt;
  309 }
  310 
  311 unsigned int
  312 sndbuf_getblksz(struct snd_dbuf *b)
  313 {
  314         return b->blksz;
  315 }
  316 
  317 void
  318 sndbuf_setblksz(struct snd_dbuf *b, unsigned int blksz)
  319 {
  320         b->blksz = blksz;
  321 }
  322 
  323 unsigned int
  324 sndbuf_getbps(struct snd_dbuf *b)
  325 {
  326         return b->bps;
  327 }
  328 
  329 void *
  330 sndbuf_getbuf(struct snd_dbuf *b)
  331 {
  332         return b->buf;
  333 }
  334 
  335 void *
  336 sndbuf_getbufofs(struct snd_dbuf *b, unsigned int ofs)
  337 {
  338         KASSERT(ofs < b->bufsize, ("%s: ofs invalid %d", __func__, ofs));
  339 
  340         return b->buf + ofs;
  341 }
  342 
  343 unsigned int
  344 sndbuf_getsize(struct snd_dbuf *b)
  345 {
  346         return b->bufsize;
  347 }
  348 
  349 unsigned int
  350 sndbuf_getmaxsize(struct snd_dbuf *b)
  351 {
  352         return b->maxsize;
  353 }
  354 
  355 unsigned int
  356 sndbuf_runsz(struct snd_dbuf *b)
  357 {
  358         return b->dl;
  359 }
  360 
  361 void
  362 sndbuf_setrun(struct snd_dbuf *b, int go)
  363 {
  364         b->dl = go? b->blksz : 0;
  365 }
  366 
  367 struct selinfo *
  368 sndbuf_getsel(struct snd_dbuf *b)
  369 {
  370         return &b->sel;
  371 }
  372 
  373 /************************************************************/
  374 unsigned int
  375 sndbuf_getxrun(struct snd_dbuf *b)
  376 {
  377         SNDBUF_LOCKASSERT(b);
  378 
  379         return b->xrun;
  380 }
  381 
  382 void
  383 sndbuf_setxrun(struct snd_dbuf *b, unsigned int cnt)
  384 {
  385         SNDBUF_LOCKASSERT(b);
  386 
  387         b->xrun = cnt;
  388 }
  389 
  390 unsigned int
  391 sndbuf_gethwptr(struct snd_dbuf *b)
  392 {
  393         SNDBUF_LOCKASSERT(b);
  394 
  395         return b->hp;
  396 }
  397 
  398 void
  399 sndbuf_sethwptr(struct snd_dbuf *b, unsigned int ptr)
  400 {
  401         SNDBUF_LOCKASSERT(b);
  402 
  403         b->hp = ptr;
  404 }
  405 
  406 unsigned int
  407 sndbuf_getready(struct snd_dbuf *b)
  408 {
  409         SNDBUF_LOCKASSERT(b);
  410         KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d", __func__, b->rl));
  411 
  412         return b->rl;
  413 }
  414 
  415 unsigned int
  416 sndbuf_getreadyptr(struct snd_dbuf *b)
  417 {
  418         SNDBUF_LOCKASSERT(b);
  419         KASSERT((b->rp >= 0) && (b->rp <= b->bufsize), ("%s: b->rp invalid %d", __func__, b->rp));
  420 
  421         return b->rp;
  422 }
  423 
  424 unsigned int
  425 sndbuf_getfree(struct snd_dbuf *b)
  426 {
  427         SNDBUF_LOCKASSERT(b);
  428         KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d", __func__, b->rl));
  429 
  430         return b->bufsize - b->rl;
  431 }
  432 
  433 unsigned int
  434 sndbuf_getfreeptr(struct snd_dbuf *b)
  435 {
  436         SNDBUF_LOCKASSERT(b);
  437         KASSERT((b->rp >= 0) && (b->rp <= b->bufsize), ("%s: b->rp invalid %d", __func__, b->rp));
  438         KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d", __func__, b->rl));
  439 
  440         return (b->rp + b->rl) % b->bufsize;
  441 }
  442 
  443 unsigned int
  444 sndbuf_getblocks(struct snd_dbuf *b)
  445 {
  446         SNDBUF_LOCKASSERT(b);
  447 
  448         return b->total / b->blksz;
  449 }
  450 
  451 unsigned int
  452 sndbuf_getprevblocks(struct snd_dbuf *b)
  453 {
  454         SNDBUF_LOCKASSERT(b);
  455 
  456         return b->prev_total / b->blksz;
  457 }
  458 
  459 unsigned int
  460 sndbuf_gettotal(struct snd_dbuf *b)
  461 {
  462         SNDBUF_LOCKASSERT(b);
  463 
  464         return b->total;
  465 }
  466 
  467 void
  468 sndbuf_updateprevtotal(struct snd_dbuf *b)
  469 {
  470         SNDBUF_LOCKASSERT(b);
  471 
  472         b->prev_total = b->total;
  473 }
  474 
  475 /************************************************************/
  476 
  477 int
  478 sndbuf_acquire(struct snd_dbuf *b, u_int8_t *from, unsigned int count)
  479 {
  480         int l;
  481 
  482         KASSERT(count <= sndbuf_getfree(b), ("%s: count %d > free %d", __func__, count, sndbuf_getfree(b)));
  483         KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d", __func__, b->rl));
  484         b->total += count;
  485         if (from != NULL) {
  486                 while (count > 0) {
  487                         l = MIN(count, sndbuf_getsize(b) - sndbuf_getfreeptr(b));
  488                         bcopy(from, sndbuf_getbufofs(b, sndbuf_getfreeptr(b)), l);
  489                         from += l;
  490                         b->rl += l;
  491                         count -= l;
  492                 }
  493         } else
  494                 b->rl += count;
  495         KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d, count %d", __func__, b->rl, count));
  496 
  497         return 0;
  498 }
  499 
  500 int
  501 sndbuf_dispose(struct snd_dbuf *b, u_int8_t *to, unsigned int count)
  502 {
  503         int l;
  504 
  505         KASSERT(count <= sndbuf_getready(b), ("%s: count %d > ready %d", __func__, count, sndbuf_getready(b)));
  506         KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d", __func__, b->rl));
  507         if (to != NULL) {
  508                 while (count > 0) {
  509                         l = MIN(count, sndbuf_getsize(b) - sndbuf_getreadyptr(b));
  510                         bcopy(sndbuf_getbufofs(b, sndbuf_getreadyptr(b)), to, l);
  511                         to += l;
  512                         b->rl -= l;
  513                         b->rp = (b->rp + l) % b->bufsize;
  514                         count -= l;
  515                 }
  516         } else {
  517                 b->rl -= count;
  518                 b->rp = (b->rp + count) % b->bufsize;
  519         }
  520         KASSERT((b->rl >= 0) && (b->rl <= b->bufsize), ("%s: b->rl invalid %d, count %d", __func__, b->rl, count));
  521 
  522         return 0;
  523 }
  524 
  525 /* count is number of bytes we want added to destination buffer */
  526 int
  527 sndbuf_feed(struct snd_dbuf *from, struct snd_dbuf *to, struct pcm_channel *channel, struct pcm_feeder *feeder, unsigned int count)
  528 {
  529         KASSERT(count > 0, ("can't feed 0 bytes"));
  530 
  531         if (sndbuf_getfree(to) < count)
  532                 return EINVAL;
  533 
  534         count = FEEDER_FEED(feeder, channel, to->tmpbuf, count, from);
  535         if (count)
  536                 sndbuf_acquire(to, to->tmpbuf, count);
  537         /* the root feeder has called sndbuf_dispose(from, , bytes fetched) */
  538 
  539         return 0;
  540 }
  541 
  542 /************************************************************/
  543 
  544 void
  545 sndbuf_dump(struct snd_dbuf *b, char *s, u_int32_t what)
  546 {
  547         printf("%s: [", s);
  548         if (what & 0x01)
  549                 printf(" bufsize: %d, maxsize: %d", b->bufsize, b->maxsize);
  550         if (what & 0x02)
  551                 printf(" dl: %d, rp: %d, rl: %d, hp: %d", b->dl, b->rp, b->rl, b->hp);
  552         if (what & 0x04)
  553                 printf(" total: %d, prev_total: %d, xrun: %d", b->total, b->prev_total, b->xrun);
  554         if (what & 0x08)
  555                 printf(" fmt: 0x%x, spd: %d", b->fmt, b->spd);
  556         if (what & 0x10)
  557                 printf(" blksz: %d, blkcnt: %d, flags: 0x%x", b->blksz, b->blkcnt, b->flags);
  558         printf(" ]\n");
  559 }
  560 
  561 /************************************************************/
  562 u_int32_t
  563 sndbuf_getflags(struct snd_dbuf *b)
  564 {
  565         return b->flags;
  566 }
  567 
  568 void
  569 sndbuf_setflags(struct snd_dbuf *b, u_int32_t flags, int on)
  570 {
  571         b->flags &= ~flags;
  572         if (on)
  573                 b->flags |= flags;
  574 }
  575 

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