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      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