2 * Copyright (c) 2001 Cameron Grant <cg@freebsd.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
29 int vchan_create(struct pcm_channel *parent, int num);
30 int vchan_destroy(struct pcm_channel *c);
31 int vchan_initsys(device_t dev);
34 * Default speed / format
36 #define VCHAN_DEFAULT_SPEED 48000
37 #define VCHAN_DEFAULT_AFMT (AFMT_S16_LE | AFMT_STEREO)
38 #define VCHAN_DEFAULT_STRFMT "s16le"
44 * Offset by +/- 1 so we can distinguish bogus pointer.
46 #define VCHAN_SYSCTL_DATA(x, y) \
47 ((void *)((intptr_t)(((((x) + 1) & 0xfff) << 2) | \
48 (((VCHAN_##y) + 1) & 0x3))))
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)