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/channel.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: src/sys/dev/sound/pcm/channel.h,v 1.31.2.1 2005/12/30 19:55:54 netchild Exp $
   27  * $DragonFly: src/sys/dev/sound/pcm/channel.h,v 1.6 2007/06/16 20:07:22 dillon Exp $
   28  */
   29 
   30 struct pcmchan_children {
   31         SLIST_ENTRY(pcmchan_children) link;
   32         struct pcm_channel *channel;
   33 };
   34 
   35 struct pcmchan_caps {
   36         u_int32_t minspeed, maxspeed;
   37         u_int32_t *fmtlist;
   38         u_int32_t caps;
   39 };
   40 
   41 #define CHN_NAMELEN     32
   42 struct pcm_channel {
   43         kobj_t methods;
   44 
   45         int num;
   46         pid_t pid;
   47         int refcount;
   48         struct pcm_feeder *feeder;
   49         u_int32_t align;
   50 
   51         int volume;
   52         u_int32_t speed;
   53         u_int32_t format;
   54         u_int32_t flags;
   55         u_int32_t feederflags;
   56         u_int32_t blocks;
   57 
   58         int direction;
   59         unsigned int interrupts, xruns;
   60         struct snd_dbuf *bufhard, *bufsoft;
   61         struct snddev_info *parentsnddev;
   62         struct pcm_channel *parentchannel;
   63         void *devinfo;
   64         device_t dev;
   65         char name[CHN_NAMELEN];
   66         sndlock_t       lock;
   67         SLIST_HEAD(, pcmchan_children) children;
   68 };
   69 
   70 #include "channel_if.h"
   71 
   72 int chn_reinit(struct pcm_channel *c);
   73 int chn_write(struct pcm_channel *c, struct uio *buf, int ioflags);
   74 int chn_read(struct pcm_channel *c, struct uio *buf, int ioflags);
   75 u_int32_t chn_start(struct pcm_channel *c, int force);
   76 int chn_sync(struct pcm_channel *c, int threshold);
   77 int chn_flush(struct pcm_channel *c);
   78 int chn_poll(struct pcm_channel *c, int ev, struct thread *td);
   79 
   80 int chn_init(struct pcm_channel *c, void *devinfo, int dir, int direction);
   81 int chn_kill(struct pcm_channel *c);
   82 int chn_setdir(struct pcm_channel *c, int dir);
   83 int chn_reset(struct pcm_channel *c, u_int32_t fmt);
   84 int chn_setvolume(struct pcm_channel *c, int left, int right);
   85 int chn_setspeed(struct pcm_channel *c, int speed);
   86 int chn_setformat(struct pcm_channel *c, u_int32_t fmt);
   87 int chn_setblocksize(struct pcm_channel *c, int blkcnt, int blksz);
   88 int chn_trigger(struct pcm_channel *c, int go);
   89 int chn_getptr(struct pcm_channel *c);
   90 struct pcmchan_caps *chn_getcaps(struct pcm_channel *c);
   91 u_int32_t chn_getformats(struct pcm_channel *c);
   92 
   93 void chn_resetbuf(struct pcm_channel *c);
   94 void chn_intr(struct pcm_channel *c);
   95 int chn_wrfeed(struct pcm_channel *c);
   96 int chn_rdfeed(struct pcm_channel *c);
   97 int chn_abort(struct pcm_channel *c);
   98 
   99 void chn_wrupdate(struct pcm_channel *c);
  100 void chn_rdupdate(struct pcm_channel *c);
  101 
  102 int chn_notify(struct pcm_channel *c, u_int32_t flags);
  103 void chn_lock(struct pcm_channel *c);
  104 void chn_unlock(struct pcm_channel *c);
  105 
  106 #ifdef  USING_MUTEX
  107 #define CHN_LOCK(c) snd_mtxlock(((c)->lock))
  108 #define CHN_UNLOCK(c) snd_mtxunlock(((c)->lock))
  109 #define CHN_LOCKASSERT(c)
  110 #else
  111 #define CHN_LOCK(c)
  112 #define CHN_UNLOCK(c)
  113 #define CHN_LOCKASSERT(c)
  114 #endif
  115 
  116 int fmtvalid(u_int32_t fmt, u_int32_t *fmtlist);
  117 
  118 #define PCMDIR_VIRTUAL 2
  119 #define PCMDIR_PLAY 1
  120 #define PCMDIR_REC -1
  121 
  122 #define PCMTRIG_START 1
  123 #define PCMTRIG_EMLDMAWR 2
  124 #define PCMTRIG_EMLDMARD 3
  125 #define PCMTRIG_STOP 0
  126 #define PCMTRIG_ABORT -1
  127 
  128 #define PCMTRIG_COMMON(x)       ((x) == PCMTRIG_START ||                \
  129                                  (x) == PCMTRIG_STOP ||                 \
  130                                  (x) == PCMTRIG_ABORT)
  131 
  132 #define CHN_F_CLOSING           0x00000004  /* a pending close */
  133 #define CHN_F_ABORTING          0x00000008  /* a pending abort */
  134 #define CHN_F_RUNNING           0x00000010  /* dma is running */
  135 #define CHN_F_TRIGGERED         0x00000020
  136 #define CHN_F_NOTRIGGER         0x00000040
  137 
  138 #define CHN_F_BUSY              0x00001000  /* has been opened  */
  139 #define CHN_F_HAS_SIZE          0x00002000  /* user set block size */
  140 #define CHN_F_NBIO              0x00004000  /* do non-blocking i/o */
  141 #define CHN_F_MAPPED            0x00010000  /* has been mmap()ed */
  142 #define CHN_F_DEAD              0x00020000
  143 #define CHN_F_BADSETTING        0x00040000
  144 #define CHN_F_SETBLOCKSIZE      0x00080000
  145 #define CHN_F_HAS_VCHAN         0x00100000
  146 
  147 #define CHN_F_VIRTUAL           0x10000000  /* not backed by hardware */
  148 
  149 #define CHN_F_RESET             (CHN_F_BUSY | CHN_F_DEAD | \
  150                                         CHN_F_HAS_VCHAN | CHN_F_VIRTUAL)
  151                                         
  152 
  153 #define CHN_N_RATE              0x00000001
  154 #define CHN_N_FORMAT            0x00000002
  155 #define CHN_N_VOLUME            0x00000004
  156 #define CHN_N_BLOCKSIZE         0x00000008
  157 #define CHN_N_TRIGGER           0x00000010
  158 
  159 /*
  160  * This should be large enough to hold all pcm data between
  161  * tsleeps in chn_{read,write} at the highest sample rate.
  162  * (which is usually 48kHz * 16bit * stereo = 192000 bytes/sec)
  163  */
  164 #define CHN_2NDBUFBLKSIZE       (2 * 1024)
  165 /* The total number of blocks per secondary bufhard. */
  166 #define CHN_2NDBUFBLKNUM        (32)
  167 /* The size of a whole secondary bufhard. */
  168 #define CHN_2NDBUFMAXSIZE       (131072)
  169 
  170 #define CHANNEL_DECLARE(name) static DEFINE_CLASS(name, name ## _methods, sizeof(struct kobj))

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