vchan.h revision 170161 
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: head/sys/dev/sound/pcm/vchan.h 170161 2007-05-31 18:43:33Z ariff $
27 */
28
29int vchan_create(struct pcm_channel *parent, int num);
30int vchan_destroy(struct pcm_channel *c);
31int 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)
53