FreeBSD/Linux Kernel Cross Reference
sys/dev/sound/pcm/vchan.h

     /*-
      * 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_ */

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