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_if.m

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    1 #-
    2 # KOBJ
    3 #
    4 # Copyright (c) 2000 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 #include <dev/sound/pcm/sound.h>
   32 
   33 INTERFACE channel;
   34 
   35 CODE {
   36 
   37         static int
   38         channel_nosetdir(kobj_t obj, void *data, int dir)
   39         {
   40                 return 0;
   41         }
   42 
   43         static int
   44         channel_noreset(kobj_t obj, void *data)
   45         {
   46                 return 0;
   47         }
   48 
   49         static int
   50         channel_noresetdone(kobj_t obj, void *data)
   51         {
   52                 return 0;
   53         }
   54 
   55         static int
   56         channel_nofree(kobj_t obj, void *data)
   57         {
   58                 return 1;
   59         }
   60 
   61         static u_int32_t
   62         channel_nogetptr(kobj_t obj, void *data)
   63         {
   64                 return 0;
   65         }
   66 
   67         static int
   68         channel_nonotify(kobj_t obj, void *data, u_int32_t changed)
   69         {
   70                 return 0;
   71         }
   72 
   73         static int
   74         channel_nogetpeaks(kobj_t obj, void *data, int *lpeak, int *rpeak)
   75         {
   76                 return -1;
   77         }
   78 
   79         static int
   80         channel_nogetrates(kobj_t obj, void *data, int **rates)
   81         {
   82                 *rates = NULL;
   83                 return 0;
   84         }
   85 
   86         static int
   87         channel_nosetfragments(kobj_t obj, void *data, u_int32_t blocksize, u_int32_t blockcount)
   88         {
   89                 return 0;
   90         }
   91 
   92 };
   93 
   94 METHOD void* init {
   95         kobj_t obj;
   96         void *devinfo;
   97         struct snd_dbuf *b;
   98         struct pcm_channel *c;
   99         int dir;
  100 };
  101 
  102 METHOD int free {
  103         kobj_t obj;
  104         void *data;
  105 } DEFAULT channel_nofree;
  106 
  107 METHOD int reset {
  108         kobj_t obj;
  109         void *data;
  110 } DEFAULT channel_noreset;
  111 
  112 METHOD int resetdone {
  113         kobj_t obj;
  114         void *data;
  115 } DEFAULT channel_noresetdone;
  116 
  117 METHOD int setdir {
  118         kobj_t obj;
  119         void *data;
  120         int dir;
  121 } DEFAULT channel_nosetdir;
  122 
  123 METHOD u_int32_t setformat {
  124         kobj_t obj;
  125         void *data;
  126         u_int32_t format;
  127 };
  128 
  129 METHOD u_int32_t setspeed {
  130         kobj_t obj;
  131         void *data;
  132         u_int32_t speed;
  133 };
  134 
  135 METHOD u_int32_t setblocksize {
  136         kobj_t obj;
  137         void *data;
  138         u_int32_t blocksize;
  139 };
  140 
  141 METHOD int setfragments {
  142         kobj_t obj;
  143         void *data;
  144         u_int32_t blocksize;
  145         u_int32_t blockcount;
  146 } DEFAULT channel_nosetfragments;
  147 
  148 METHOD int trigger {
  149         kobj_t obj;
  150         void *data;
  151         int go;
  152 };
  153 
  154 METHOD u_int32_t getptr {
  155         kobj_t obj;
  156         void *data;
  157 } DEFAULT channel_nogetptr;
  158 
  159 METHOD struct pcmchan_caps* getcaps {
  160         kobj_t obj;
  161         void *data;
  162 };
  163 
  164 METHOD int notify {
  165         kobj_t obj;
  166         void *data;
  167         u_int32_t changed;
  168 } DEFAULT channel_nonotify;
  169 
  170 /**
  171  * @brief Retrieve channel peak values
  172  *
  173  * This function is intended to obtain peak volume values for samples
  174  * played/recorded on a channel.  Values are on a linear scale from 0 to
  175  * 32767.  If the channel is monaural, a single value should be recorded
  176  * in @c lpeak.
  177  *
  178  * If hardware support isn't available, the SNDCTL_DSP_GET[IO]PEAKS
  179  * operation should return EINVAL.  However, we may opt to provide
  180  * software support that the user may toggle via sysctl/mixext.
  181  *
  182  * @param obj   standard kobj object (usually @c channel->methods)
  183  * @param data  driver-specific data (usually @c channel->devinfo)
  184  * @param lpeak pointer to store left peak level
  185  * @param rpeak pointer to store right peak level
  186  *
  187  * @retval -1   Error; usually operation isn't supported.
  188  * @retval 0    success
  189  */
  190 METHOD int getpeaks {
  191         kobj_t obj;
  192         void *data;
  193         int *lpeak;
  194         int *rpeak;
  195 } DEFAULT channel_nogetpeaks;
  196 
  197 /**
  198  * @brief Retrieve discrete supported sample rates
  199  *
  200  * Some cards operate at fixed rates, and this call is intended to retrieve
  201  * those rates primarily for when in-kernel rate adjustment is undesirable
  202  * (e.g., application wants direct DMA access after setting a channel to run
  203  * "uncooked").
  204  *
  205  * The parameter @c rates is a double pointer which will be reset to
  206  * point to an array of supported sample rates.  The number of elements
  207  * in the array is returned to the caller.
  208  *
  209  * @param obj   standard kobj object (usually @c channel->methods)
  210  * @param data  driver-specific data (usually @c channel->devinfo)
  211  * @param rates rate array pointer
  212  *
  213  * @return Number of rates in the array
  214  */
  215 METHOD int getrates {
  216         kobj_t obj;
  217         void *data;
  218         int **rates;
  219 } DEFAULT channel_nogetrates;

Cache object: fd6dfda6030806a009d228149c12c32f


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