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  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2005-2009 Ariff Abdullah <ariff@FreeBSD.org>
    5  * Copyright (c) 2001 Cameron Grant <cg@FreeBSD.org>
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  * $FreeBSD: head/sys/dev/sound/pcm/vchan.h 326255 2017-11-27 14:52:40Z pfg $
   30  */
   31 
   32 #ifndef _SND_VCHAN_H_
   33 #define _SND_VCHAN_H_
   34 
   35 int vchan_create(struct pcm_channel *, int);
   36 int vchan_destroy(struct pcm_channel *);
   37 
   38 #ifdef SND_DEBUG
   39 int vchan_passthrough(struct pcm_channel *, const char *);
   40 #define vchan_sync(c)           vchan_passthrough(c, __func__)
   41 #else
   42 int vchan_sync(struct pcm_channel *);
   43 #endif
   44 
   45 #define VCHAN_SYNC_REQUIRED(c)                                          \
   46         (((c)->flags & CHN_F_VIRTUAL) && (((c)->flags & CHN_F_DIRTY) || \
   47         sndbuf_getfmt((c)->bufhard) != (c)->parentchannel->format ||    \
   48         sndbuf_getspd((c)->bufhard) != (c)->parentchannel->speed))
   49 
   50 void vchan_initsys(device_t);
   51 
   52 /*
   53  * Default format / rate
   54  */
   55 #define VCHAN_DEFAULT_FORMAT    SND_FORMAT(AFMT_S16_LE, 2, 0)
   56 #define VCHAN_DEFAULT_RATE      48000
   57 
   58 #define VCHAN_PLAY              0
   59 #define VCHAN_REC               1
   60 
   61 /*
   62  * Offset by +/- 1 so we can distinguish bogus pointer.
   63  */
   64 #define VCHAN_SYSCTL_DATA(x, y)                                         \
   65                 ((void *)((intptr_t)(((((x) + 1) & 0xfff) << 2) |       \
   66                 (((VCHAN_##y) + 1) & 0x3))))
   67 
   68 #define VCHAN_SYSCTL_DATA_SIZE  sizeof(void *)
   69 #define VCHAN_SYSCTL_UNIT(x)    ((int)(((intptr_t)(x) >> 2) & 0xfff) - 1)
   70 #define VCHAN_SYSCTL_DIR(x)     ((int)((intptr_t)(x) & 0x3) - 1)
   71 
   72 #endif  /* _SND_VCHAN_H_ */

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