1 /* $NetBSD: oss_caps.c,v 1.2 2021/06/09 14:49:13 nia Exp $ */
2
3 /*-
4 * Copyright (c) 2021 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Nia Alarie.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31 #include <sys/audioio.h>
32 #include "internal.h"
33
34 oss_private int
_oss_get_caps(int fd,int * out)35 _oss_get_caps(int fd, int *out)
36 {
37 struct audio_info info;
38 int props, caps;
39 int nchannels;
40
41 if (ioctl(fd, AUDIO_GETPROPS, &props) < 0)
42 return -1;
43
44 caps = 0;
45 caps |= PCM_CAP_TRIGGER;
46 caps |= PCM_CAP_MULTI;
47 caps |= PCM_CAP_FREERATE;
48
49 if (ioctl(fd, AUDIO_GETFORMAT, &info) != -1) {
50 nchannels = (props & AUDIO_PROP_PLAYBACK) ?
51 info.play.channels : info.record.channels;
52
53 switch (nchannels) {
54 case 2:
55 caps |= DSP_CH_STEREO;
56 break;
57 case 1:
58 caps |= DSP_CH_MONO;
59 break;
60 default:
61 caps |= DSP_CH_MULTI;
62 break;
63 }
64 }
65
66 if (props & AUDIO_PROP_FULLDUPLEX)
67 caps |= PCM_CAP_DUPLEX;
68 if (props & AUDIO_PROP_MMAP)
69 caps |= PCM_CAP_MMAP;
70 if (props & AUDIO_PROP_CAPTURE)
71 caps |= PCM_CAP_INPUT;
72 if (props & AUDIO_PROP_PLAYBACK)
73 caps |= PCM_CAP_OUTPUT;
74
75 *out = caps;
76 return 0;
77 }
78