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  * 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  * $FreeBSD: releng/10.3/sys/dev/sound/pcm/buffer.h 230845 2012-01-31 21:46:28Z mav $
   27  */
   28 
   29 #define SND_DMA(b) (sndbuf_getflags((b)) & SNDBUF_F_DMA)
   30 #define SNDBUF_LOCKASSERT(b)
   31 
   32 #define SNDBUF_F_DMA            0x00000001
   33 #define SNDBUF_F_XRUN           0x00000002
   34 #define SNDBUF_F_RUNNING        0x00000004
   35 #define SNDBUF_F_MANAGED        0x00000008
   36 
   37 #define SNDBUF_NAMELEN  48
   38 
   39 struct snd_dbuf {
   40         device_t dev;
   41         u_int8_t *buf, *tmpbuf;
   42         u_int8_t *shadbuf; /**< shadow buffer used w/ S_D_SILENCE/SKIP */
   43         volatile int sl; /**< shadbuf ready length in # of bytes */
   44         unsigned int bufsize, maxsize, allocsize;
   45         volatile int dl; /* transfer size */
   46         volatile int rp; /* pointers to the ready area */
   47         volatile int rl; /* length of ready area */
   48         volatile int hp;
   49         volatile u_int64_t total, prev_total;
   50         int dmachan, dir;       /* dma channel */
   51         u_int32_t fmt, spd, bps, align;
   52         unsigned int blksz, blkcnt;
   53         int xrun;
   54         u_int32_t flags;
   55         bus_dmamap_t dmamap;
   56         bus_dma_tag_t dmatag;
   57         bus_addr_t buf_addr;
   58         int dmaflags;
   59         struct selinfo sel;
   60         struct pcm_channel *channel;
   61         char name[SNDBUF_NAMELEN];
   62 };
   63 
   64 struct snd_dbuf *sndbuf_create(device_t dev, char *drv, char *desc, struct pcm_channel *channel);
   65 void sndbuf_destroy(struct snd_dbuf *b);
   66 
   67 void sndbuf_dump(struct snd_dbuf *b, char *s, u_int32_t what);
   68 
   69 int sndbuf_alloc(struct snd_dbuf *b, bus_dma_tag_t dmatag, int dmaflags, unsigned int size);
   70 int sndbuf_setup(struct snd_dbuf *b, void *buf, unsigned int size);
   71 void sndbuf_free(struct snd_dbuf *b);
   72 int sndbuf_resize(struct snd_dbuf *b, unsigned int blkcnt, unsigned int blksz);
   73 int sndbuf_remalloc(struct snd_dbuf *b, unsigned int blkcnt, unsigned int blksz);
   74 void sndbuf_reset(struct snd_dbuf *b);
   75 void sndbuf_clear(struct snd_dbuf *b, unsigned int length);
   76 void sndbuf_fillsilence(struct snd_dbuf *b);
   77 void sndbuf_fillsilence_rl(struct snd_dbuf *b, u_int rl);
   78 void sndbuf_softreset(struct snd_dbuf *b);
   79 void sndbuf_clearshadow(struct snd_dbuf *b);
   80 
   81 u_int32_t sndbuf_getfmt(struct snd_dbuf *b);
   82 int sndbuf_setfmt(struct snd_dbuf *b, u_int32_t fmt);
   83 unsigned int sndbuf_getspd(struct snd_dbuf *b);
   84 void sndbuf_setspd(struct snd_dbuf *b, unsigned int spd);
   85 unsigned int sndbuf_getbps(struct snd_dbuf *b);
   86 
   87 bus_addr_t sndbuf_getbufaddr(struct snd_dbuf *buf);
   88 
   89 void *sndbuf_getbuf(struct snd_dbuf *b);
   90 void *sndbuf_getbufofs(struct snd_dbuf *b, unsigned int ofs);
   91 unsigned int sndbuf_getsize(struct snd_dbuf *b);
   92 unsigned int sndbuf_getmaxsize(struct snd_dbuf *b);
   93 unsigned int sndbuf_getallocsize(struct snd_dbuf *b);
   94 unsigned int sndbuf_getalign(struct snd_dbuf *b);
   95 unsigned int sndbuf_getblkcnt(struct snd_dbuf *b);
   96 void sndbuf_setblkcnt(struct snd_dbuf *b, unsigned int blkcnt);
   97 unsigned int sndbuf_getblksz(struct snd_dbuf *b);
   98 void sndbuf_setblksz(struct snd_dbuf *b, unsigned int blksz);
   99 unsigned int sndbuf_runsz(struct snd_dbuf *b);
  100 void sndbuf_setrun(struct snd_dbuf *b, int go);
  101 struct selinfo *sndbuf_getsel(struct snd_dbuf *b);
  102 
  103 unsigned int sndbuf_getxrun(struct snd_dbuf *b);
  104 void sndbuf_setxrun(struct snd_dbuf *b, unsigned int xrun);
  105 unsigned int sndbuf_gethwptr(struct snd_dbuf *b);
  106 void sndbuf_sethwptr(struct snd_dbuf *b, unsigned int ptr);
  107 unsigned int sndbuf_getfree(struct snd_dbuf *b);
  108 unsigned int sndbuf_getfreeptr(struct snd_dbuf *b);
  109 unsigned int sndbuf_getready(struct snd_dbuf *b);
  110 unsigned int sndbuf_getreadyptr(struct snd_dbuf *b);
  111 u_int64_t sndbuf_getblocks(struct snd_dbuf *b);
  112 u_int64_t sndbuf_getprevblocks(struct snd_dbuf *b);
  113 u_int64_t sndbuf_gettotal(struct snd_dbuf *b);
  114 u_int64_t sndbuf_getprevtotal(struct snd_dbuf *b);
  115 unsigned int sndbuf_xbytes(unsigned int v, struct snd_dbuf *from, struct snd_dbuf *to);
  116 u_int8_t sndbuf_zerodata(u_int32_t fmt);
  117 void sndbuf_updateprevtotal(struct snd_dbuf *b);
  118 
  119 int sndbuf_acquire(struct snd_dbuf *b, u_int8_t *from, unsigned int count);
  120 int sndbuf_dispose(struct snd_dbuf *b, u_int8_t *to, unsigned int count);
  121 int sndbuf_feed(struct snd_dbuf *from, struct snd_dbuf *to, struct pcm_channel *channel, struct pcm_feeder *feeder, unsigned int count);
  122 
  123 u_int32_t sndbuf_getflags(struct snd_dbuf *b);
  124 void sndbuf_setflags(struct snd_dbuf *b, u_int32_t flags, int on);
  125 
  126 int sndbuf_dmasetup(struct snd_dbuf *b, struct resource *drq);
  127 int sndbuf_dmasetdir(struct snd_dbuf *b, int dir);
  128 void sndbuf_dma(struct snd_dbuf *b, int go);
  129 int sndbuf_dmaptr(struct snd_dbuf *b);
  130 void sndbuf_dmabounce(struct snd_dbuf *b);
  131 
  132 #ifdef OSSV4_EXPERIMENT
  133 void sndbuf_getpeaks(struct snd_dbuf *b, int *lp, int *rp);
  134 #endif
  135 
  136 static inline u_int32_t
  137 snd_xbytes(u_int32_t v, u_int32_t from, u_int32_t to)
  138 {
  139 
  140         if (from == to)
  141                 return (v);
  142         if (from == 0)
  143                 return (0);
  144         return ((u_int64_t)v * to / from);
  145 }

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