vchan.h revision 302408 
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: stable/11/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
33int vchan_create(struct pcm_channel *, int);
34int vchan_destroy(struct pcm_channel *);
35
36#ifdef SND_DEBUG
37int vchan_passthrough(struct pcm_channel *, const char *);
38#define vchan_sync(c)		vchan_passthrough(c, __func__)
39#else
40int 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
48void 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_ */
71