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/vchan.h

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    1 /*-
    2  * Copyright (c) 2001 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/vchan.h 170161 2007-05-31 18:43:33Z ariff $
   27  */
   28 
   29 int vchan_create(struct pcm_channel *parent, int num);
   30 int vchan_destroy(struct pcm_channel *c);
   31 int vchan_initsys(device_t dev);
   32 
   33 /*
   34  * Default speed / format
   35  */
   36 #define VCHAN_DEFAULT_SPEED     48000
   37 #define VCHAN_DEFAULT_AFMT      (AFMT_S16_LE | AFMT_STEREO)
   38 #define VCHAN_DEFAULT_STRFMT    "s16le"
   39 
   40 #define VCHAN_PLAY              0
   41 #define VCHAN_REC               1
   42 
   43 /*
   44  * Offset by +/- 1 so we can distinguish bogus pointer.
   45  */
   46 #define VCHAN_SYSCTL_DATA(x, y)                                         \
   47                 ((void *)((intptr_t)(((((x) + 1) & 0xfff) << 2) |       \
   48                 (((VCHAN_##y) + 1) & 0x3))))
   49 
   50 #define VCHAN_SYSCTL_DATA_SIZE  sizeof(void *)
   51 #define VCHAN_SYSCTL_UNIT(x)    ((int)(((intptr_t)(x) >> 2) & 0xfff) - 1)
   52 #define VCHAN_SYSCTL_DIR(x)     ((int)((intptr_t)(x) & 0x3) - 1)

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