vchan.h revision 285830 
1145253Simp/*-
2145253Simp * Copyright (c) 2005-2009 Ariff Abdullah <ariff@FreeBSD.org>
3145253Simp * Copyright (c) 2001 Cameron Grant <cg@FreeBSD.org>
4145253Simp * All rights reserved.
5145253Simp *
6145253Simp * Redistribution and use in source and binary forms, with or without
7145253Simp * modification, are permitted provided that the following conditions
8145253Simp * are met:
9145253Simp * 1. Redistributions of source code must retain the above copyright
10145253Simp *    notice, this list of conditions and the following disclaimer.
11145253Simp * 2. Redistributions in binary form must reproduce the above copyright
12145253Simp *    notice, this list of conditions and the following disclaimer in the
13145253Simp *    documentation and/or other materials provided with the distribution.
14145253Simp *
15145253Simp * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16145253Simp * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17145253Simp * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18145253Simp * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19145253Simp * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20145253Simp * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21145253Simp * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22145253Simp * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23145253Simp * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24145253Simp * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25145253Simp * SUCH DAMAGE.
26145253Simp *
27145253Simp * $FreeBSD: releng/10.2/sys/dev/sound/pcm/vchan.h 193640 2009-06-07 19:12:08Z ariff $
28145253Simp */
29145253Simp
30145253Simp#ifndef _SND_VCHAN_H_
31145253Simp#define _SND_VCHAN_H_
32145253Simp
33145253Simpint vchan_create(struct pcm_channel *, int);
34145253Simpint vchan_destroy(struct pcm_channel *);
35145253Simp
36145253Simp#ifdef SND_DEBUG
37145253Simpint vchan_passthrough(struct pcm_channel *, const char *);
38145253Simp#define vchan_sync(c)		vchan_passthrough(c, __func__)
39145253Simp#else
40145253Simpint vchan_sync(struct pcm_channel *);
41145253Simp#endif
42145253Simp
43145253Simp#define VCHAN_SYNC_REQUIRED(c)						\
44145253Simp	(((c)->flags & CHN_F_VIRTUAL) && (((c)->flags & CHN_F_DIRTY) ||	\
45145253Simp	sndbuf_getfmt((c)->bufhard) != (c)->parentchannel->format ||	\
46145253Simp	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