text: /*-
   * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
   *
   * Copyright (c) 2005-2009 Ariff Abdullah <ariff@FreeBSD.org>
   * Copyright (c) 2001 Cameron Grant <cg@FreeBSD.org>
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   *
   * $FreeBSD$
   */
  
  #ifndef _SND_VCHAN_H_
  #define _SND_VCHAN_H_
  
  int vchan_create(struct pcm_channel *, int);
  int vchan_destroy(struct pcm_channel *);
  
  #ifdef SND_DEBUG
  int vchan_passthrough(struct pcm_channel *, const char *);
  #define vchan_sync(c)		vchan_passthrough(c, __func__)
  #else
  int vchan_sync(struct pcm_channel *);
  #endif
  
  #define VCHAN_SYNC_REQUIRED(c)						\
  	(((c)->flags & CHN_F_VIRTUAL) && (((c)->flags & CHN_F_DIRTY) ||	\
  	sndbuf_getfmt((c)->bufhard) != (c)->parentchannel->format ||	\
  	sndbuf_getspd((c)->bufhard) != (c)->parentchannel->speed))
  
  void vchan_initsys(device_t);
  
  /*
   * Default format / rate
   */
  #define VCHAN_DEFAULT_FORMAT	SND_FORMAT(AFMT_S16_LE, 2, 0)
  #define VCHAN_DEFAULT_RATE	48000
  
  #define VCHAN_PLAY		0
  #define VCHAN_REC		1
  
  /*
   * Offset by +/- 1 so we can distinguish bogus pointer.
   */
  #define VCHAN_SYSCTL_DATA(x, y)						\
  		((void *)((intptr_t)(((((x) + 1) & 0xfff) << 2) |	\
  		(((VCHAN_##y) + 1) & 0x3))))
  
  #define VCHAN_SYSCTL_DATA_SIZE	sizeof(void *)
  #define VCHAN_SYSCTL_UNIT(x)	((int)(((intptr_t)(x) >> 2) & 0xfff) - 1)
  #define VCHAN_SYSCTL_DIR(x)	((int)((intptr_t)(x) & 0x3) - 1)
  
  #endif	/* _SND_VCHAN_H_ */
  