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/feeder.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/7.3/sys/dev/sound/pcm/feeder.h 167644 2007-03-16 17:15:33Z ariff $
   27  */
   28 
   29 struct pcm_feederdesc {
   30         u_int32_t type;
   31         u_int32_t in, out;
   32         u_int32_t flags;
   33         int idx;
   34 };
   35 
   36 struct feeder_class {
   37         KOBJ_CLASS_FIELDS;
   38         int align;
   39         struct pcm_feederdesc *desc;
   40         void *data;
   41 };
   42 
   43 struct pcm_feeder {
   44         KOBJ_FIELDS;
   45         int align;
   46         struct pcm_feederdesc *desc, desc_static;
   47         void *data;
   48         struct feeder_class *class;
   49         struct pcm_feeder *source, *parent;
   50 
   51 };
   52 
   53 void feeder_register(void *p);
   54 struct feeder_class *feeder_getclass(struct pcm_feederdesc *desc);
   55 
   56 u_int32_t chn_fmtscore(u_int32_t fmt);
   57 u_int32_t chn_fmtbestbit(u_int32_t fmt, u_int32_t *fmts);
   58 u_int32_t chn_fmtbeststereo(u_int32_t fmt, u_int32_t *fmts);
   59 u_int32_t chn_fmtbest(u_int32_t fmt, u_int32_t *fmts);
   60 u_int32_t chn_fmtchain(struct pcm_channel *c, u_int32_t *to);
   61 int chn_addfeeder(struct pcm_channel *c, struct feeder_class *fc, struct pcm_feederdesc *desc);
   62 int chn_removefeeder(struct pcm_channel *c);
   63 struct pcm_feeder *chn_findfeeder(struct pcm_channel *c, u_int32_t type);
   64 void feeder_printchain(struct pcm_feeder *head);
   65 
   66 #define FEEDER_DECLARE(feeder, palign, pdata) \
   67 static struct feeder_class feeder ## _class = { \
   68         .name =         #feeder, \
   69         .methods =      feeder ## _methods, \
   70         .size =         sizeof(struct pcm_feeder), \
   71         .align =        palign, \
   72         .desc =         feeder ## _desc, \
   73         .data =         pdata, \
   74 }; \
   75 SYSINIT(feeder, SI_SUB_DRIVERS, SI_ORDER_ANY, feeder_register, &feeder ## _class);
   76 
   77 #define FEEDER_ROOT     0
   78 #define FEEDER_FMT      1
   79 #define FEEDER_MIXER    2
   80 #define FEEDER_RATE     3
   81 #define FEEDER_FILTER   4
   82 #define FEEDER_VOLUME   5
   83 #define FEEDER_SWAPLR   6
   84 #define FEEDER_LAST     32
   85 
   86 #define FEEDRATE_SRC    1
   87 #define FEEDRATE_DST    2
   88 
   89 #define FEEDRATE_RATEMIN        1
   90 #define FEEDRATE_RATEMAX        2016000 /* 48000 * 42 */
   91 
   92 #define FEEDRATE_MIN            1
   93 #define FEEDRATE_MAX            0x7fffff        /* sign 24bit ~ 8ghz ! */
   94 
   95 #define FEEDRATE_ROUNDHZ        25
   96 #define FEEDRATE_ROUNDHZ_MIN    0
   97 #define FEEDRATE_ROUNDHZ_MAX    500
   98 
   99 /*
  100  * Default buffer size for feeder processing.
  101  *
  102  * Big   = less sndbuf_feed(), more memory usage.
  103  * Small = aggresive sndbuf_feed() (perhaps too much), less memory usage.
  104  */
  105 #define FEEDBUFSZ       16384
  106 #define FEEDBUFSZ_MIN   2048
  107 #define FEEDBUFSZ_MAX   131072
  108 
  109 extern int feeder_rate_min;
  110 extern int feeder_rate_max;
  111 extern int feeder_rate_round;
  112 extern int feeder_buffersize;

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