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) 2005-2009 Ariff Abdullah <ariff@FreeBSD.org>
    3  * Copyright (c) 2001 Cameron Grant <cg@FreeBSD.org>
    4  * All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   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  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   25  * SUCH DAMAGE.
   26  *
   27  * $FreeBSD: releng/9.0/sys/dev/sound/pcm/vchan.h 193640 2009-06-07 19:12:08Z ariff $
   28  */
   29 
   30 #ifndef _SND_VCHAN_H_
   31 #define _SND_VCHAN_H_
   32 
   33 int vchan_create(struct pcm_channel *, int);
   34 int vchan_destroy(struct pcm_channel *);
   35 
   36 #ifdef SND_DEBUG
   37 int vchan_passthrough(struct pcm_channel *, const char *);
   38 #define vchan_sync(c)           vchan_passthrough(c, __func__)
   39 #else
   40 int vchan_sync(struct pcm_channel *);
   41 #endif
   42 
   43 #define VCHAN_SYNC_REQUIRED(c)                                          \
   44         (((c)->flags & CHN_F_VIRTUAL) && (((c)->flags & CHN_F_DIRTY) || \
   45         sndbuf_getfmt((c)->bufhard) != (c)->parentchannel->format ||    \
   46         sndbuf_getspd((c)->bufhard) != (c)->parentchannel->speed))
   47 
   48 void vchan_initsys(device_t);
   49 
   50 /*
   51  * Default format / rate
   52  */
   53 #define VCHAN_DEFAULT_FORMAT    SND_FORMAT(AFMT_S16_LE, 2, 0)
   54 #define VCHAN_DEFAULT_RATE      48000
   55 
   56 #define VCHAN_PLAY              0
   57 #define VCHAN_REC               1
   58 
   59 /*
   60  * Offset by +/- 1 so we can distinguish bogus pointer.
   61  */
   62 #define VCHAN_SYSCTL_DATA(x, y)                                         \
   63                 ((void *)((intptr_t)(((((x) + 1) & 0xfff) << 2) |       \
   64                 (((VCHAN_##y) + 1) & 0x3))))
   65 
   66 #define VCHAN_SYSCTL_DATA_SIZE  sizeof(void *)
   67 #define VCHAN_SYSCTL_UNIT(x)    ((int)(((intptr_t)(x) >> 2) & 0xfff) - 1)
   68 #define VCHAN_SYSCTL_DIR(x)     ((int)((intptr_t)(x) & 0x3) - 1)
   69 
   70 #endif  /* _SND_VCHAN_H_ */

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