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 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