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/i386/include/pcaudioio.h

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    1 /*-
    2  * Copyright (c) 1994 Søren Schmidt
    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  *    in this position and unchanged.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  * 3. The name of the author may not be used to endorse or promote products
   15  *    derived from this software without specific prior written permission
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   27  *
   28  * $FreeBSD: src/sys/i386/include/pcaudioio.h,v 1.10 1999/08/28 00:44:20 peter Exp $
   29  */
   30 
   31 #ifndef _MACHINE_PCAUDIOIO_H_
   32 #define _MACHINE_PCAUDIOIO_H_
   33 
   34 #include <sys/ioccom.h>
   35 
   36 typedef struct audio_prinfo {
   37         unsigned        sample_rate;    /* samples per second */
   38         unsigned        channels;       /* # of channels (interleaved) */
   39         unsigned        precision;      /* sample size in bits */
   40         unsigned        encoding;       /* encoding method used */
   41 
   42         unsigned        gain;           /* volume level: 0 - 255 */
   43         unsigned        port;           /* input/output device */
   44         unsigned        _fill1[4];
   45 
   46         unsigned        samples;        /* samples played */
   47         unsigned        eof;            /* ?!? */
   48         unsigned char   pause;          /* !=0 pause, ==0 continue */
   49         unsigned char   error;          /* !=0 if overflow/underflow */
   50         unsigned char   waiting;        /* !=0 if others wants access */
   51         unsigned char   _fill2[3];
   52 
   53         unsigned char   open;           /* is device open */
   54         unsigned char   active;         /* !=0 if sound hardware is active */
   55 } audio_prinfo_t;
   56 
   57 typedef struct audio_info {
   58         audio_prinfo_t  play;
   59         audio_prinfo_t  record;
   60         unsigned        monitor_gain;
   61         unsigned        _fill[4];
   62 } audio_info_t;
   63 
   64 #define AUDIO_ENCODING_ULAW     (1)     /* u-law encoding */
   65 #define AUDIO_ENCODING_ALAW     (2)     /* A-law encoding */
   66 #define AUDIO_ENCODING_RAW      (3)     /* linear encoding */
   67 
   68 #define AUDIO_MIN_GAIN          (0)     /* minimum volume value */
   69 #define AUDIO_MAX_GAIN          (255)   /* maximum volume value */
   70 
   71 #define AUDIO_INITINFO(i)       memset((void*)i, 0xff, sizeof(audio_info_t))
   72 
   73 #define AUDIO_GETINFO           _IOR('A', 1, audio_info_t)
   74 #define AUDIO_SETINFO           _IOWR('A', 2, audio_info_t)
   75 #define AUDIO_DRAIN             _IO('A', 3)
   76 #define AUDIO_FLUSH             _IO('A', 4)
   77 
   78 /* compatibility to /dev/audio */
   79 #define AUDIO_COMPAT_DRAIN      _IO('P', 1)
   80 #define AUDIO_COMPAT_FLUSH      _IO('P', 0)
   81 
   82 #endif /* !_MACHINE_PCAUDIOIO_H_ */

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