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.h

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 1999 Cameron Grant <cg@freebsd.org>
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  *
   28  * $FreeBSD$
   29  */
   30 
   31 #define SNDBUF_LOCKASSERT(b)
   32 
   33 #define SNDBUF_F_MANAGED        0x00000008
   34 
   35 #define SNDBUF_NAMELEN  48
   36 
   37 struct snd_dbuf {
   38         device_t dev;
   39         u_int8_t *buf, *tmpbuf;
   40         u_int8_t *shadbuf; /**< shadow buffer used w/ S_D_SILENCE/SKIP */
   41         volatile int sl; /**< shadbuf ready length in # of bytes */
   42         unsigned int bufsize, maxsize, allocsize;
   43         volatile int dl; /* transfer size */
   44         volatile int rp; /* pointers to the ready area */
   45         volatile int rl; /* length of ready area */
   46         volatile int hp;
   47         volatile u_int64_t total, prev_total;
   48         int dmachan, dir;       /* dma channel */
   49         u_int32_t fmt, spd, bps, align;
   50         unsigned int blksz, blkcnt;
   51         int xrun;
   52         u_int32_t flags;
   53         bus_dmamap_t dmamap;
   54         bus_dma_tag_t dmatag;
   55         bus_addr_t buf_addr;
   56         int dmaflags;
   57         struct selinfo sel;
   58         struct pcm_channel *channel;
   59         char name[SNDBUF_NAMELEN];
   60 };
   61 
   62 struct snd_dbuf *sndbuf_create(device_t dev, char *drv, char *desc, struct pcm_channel *channel);
   63 void sndbuf_destroy(struct snd_dbuf *b);
   64 
   65 void sndbuf_dump(struct snd_dbuf *b, char *s, u_int32_t what);
   66 
   67 int sndbuf_alloc(struct snd_dbuf *b, bus_dma_tag_t dmatag, int dmaflags, unsigned int size);
   68 int sndbuf_setup(struct snd_dbuf *b, void *buf, unsigned int size);
   69 void sndbuf_free(struct snd_dbuf *b);
   70 int sndbuf_resize(struct snd_dbuf *b, unsigned int blkcnt, unsigned int blksz);
   71 int sndbuf_remalloc(struct snd_dbuf *b, unsigned int blkcnt, unsigned int blksz);
   72 void sndbuf_reset(struct snd_dbuf *b);
   73 void sndbuf_clear(struct snd_dbuf *b, unsigned int length);
   74 void sndbuf_fillsilence(struct snd_dbuf *b);
   75 void sndbuf_fillsilence_rl(struct snd_dbuf *b, u_int rl);
   76 void sndbuf_softreset(struct snd_dbuf *b);
   77 void sndbuf_clearshadow(struct snd_dbuf *b);
   78 
   79 u_int32_t sndbuf_getfmt(struct snd_dbuf *b);
   80 int sndbuf_setfmt(struct snd_dbuf *b, u_int32_t fmt);
   81 unsigned int sndbuf_getspd(struct snd_dbuf *b);
   82 void sndbuf_setspd(struct snd_dbuf *b, unsigned int spd);
   83 unsigned int sndbuf_getbps(struct snd_dbuf *b);
   84 
   85 bus_addr_t sndbuf_getbufaddr(struct snd_dbuf *buf);
   86 
   87 void *sndbuf_getbuf(struct snd_dbuf *b);
   88 void *sndbuf_getbufofs(struct snd_dbuf *b, unsigned int ofs);
   89 unsigned int sndbuf_getsize(struct snd_dbuf *b);
   90 unsigned int sndbuf_getmaxsize(struct snd_dbuf *b);
   91 unsigned int sndbuf_getallocsize(struct snd_dbuf *b);
   92 unsigned int sndbuf_getalign(struct snd_dbuf *b);
   93 unsigned int sndbuf_getblkcnt(struct snd_dbuf *b);
   94 void sndbuf_setblkcnt(struct snd_dbuf *b, unsigned int blkcnt);
   95 unsigned int sndbuf_getblksz(struct snd_dbuf *b);
   96 void sndbuf_setblksz(struct snd_dbuf *b, unsigned int blksz);
   97 unsigned int sndbuf_runsz(struct snd_dbuf *b);
   98 void sndbuf_setrun(struct snd_dbuf *b, int go);
   99 struct selinfo *sndbuf_getsel(struct snd_dbuf *b);
  100 
  101 unsigned int sndbuf_getxrun(struct snd_dbuf *b);
  102 void sndbuf_setxrun(struct snd_dbuf *b, unsigned int xrun);
  103 unsigned int sndbuf_gethwptr(struct snd_dbuf *b);
  104 void sndbuf_sethwptr(struct snd_dbuf *b, unsigned int ptr);
  105 unsigned int sndbuf_getfree(struct snd_dbuf *b);
  106 unsigned int sndbuf_getfreeptr(struct snd_dbuf *b);
  107 unsigned int sndbuf_getready(struct snd_dbuf *b);
  108 unsigned int sndbuf_getreadyptr(struct snd_dbuf *b);
  109 u_int64_t sndbuf_getblocks(struct snd_dbuf *b);
  110 u_int64_t sndbuf_getprevblocks(struct snd_dbuf *b);
  111 u_int64_t sndbuf_gettotal(struct snd_dbuf *b);
  112 u_int64_t sndbuf_getprevtotal(struct snd_dbuf *b);
  113 unsigned int sndbuf_xbytes(unsigned int v, struct snd_dbuf *from, struct snd_dbuf *to);
  114 u_int8_t sndbuf_zerodata(u_int32_t fmt);
  115 void sndbuf_updateprevtotal(struct snd_dbuf *b);
  116 
  117 int sndbuf_acquire(struct snd_dbuf *b, u_int8_t *from, unsigned int count);
  118 int sndbuf_dispose(struct snd_dbuf *b, u_int8_t *to, unsigned int count);
  119 int sndbuf_feed(struct snd_dbuf *from, struct snd_dbuf *to, struct pcm_channel *channel, struct pcm_feeder *feeder, unsigned int count);
  120 
  121 u_int32_t sndbuf_getflags(struct snd_dbuf *b);
  122 void sndbuf_setflags(struct snd_dbuf *b, u_int32_t flags, int on);
  123 
  124 #ifdef OSSV4_EXPERIMENT
  125 void sndbuf_getpeaks(struct snd_dbuf *b, int *lp, int *rp);
  126 #endif
  127 
  128 static inline u_int32_t
  129 snd_xbytes(u_int32_t v, u_int32_t from, u_int32_t to)
  130 {
  131 
  132         if (from == to)
  133                 return (v);
  134         if (from == 0)
  135                 return (0);
  136         return ((u_int64_t)v * to / from);
  137 }

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