2 * This file is part of DisOrder
3 * Copyright (C) 2004, 2007 Richard Kettlewell
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
20 /** @file lib/mixer-oss.c
21 * @brief OSS mixer support
23 * Mono output devices aren't explicitly supported (but may work
29 #if HAVE_SYS_SOUNDCARD_H
40 #include <sys/ioctl.h>
41 #include <sys/soundcard.h>
43 #include "configuration.h"
48 /* documentation does not match implementation! */
49 #ifndef SOUND_MIXER_READ
50 # define SOUND_MIXER_READ(x) MIXER_READ(x)
52 #ifndef SOUND_MIXER_WRITE
53 # define SOUND_MIXER_WRITE(x) MIXER_WRITE(x)
56 /** @brief Channel names */
57 static const char *channels
[] = SOUND_DEVICE_NAMES
;
59 /** @brief Convert channel name to number */
60 static int mixer_channel(const char *c
) {
63 if(!c
[strspn(c
, "0123456789")])
66 for(n
= 0; n
< sizeof channels
/ sizeof *channels
; ++n
)
67 if(!strcmp(channels
[n
], c
))
73 /** @brief Open the OSS mixer device and return its fd */
74 static int oss_do_open(void) {
77 if((fd
= open(config
->mixer
, O_RDWR
, 0)) < 0)
78 error(errno
, "error opening %s", config
->mixer
);
82 /** @brief Get the OSS mixer setting */
83 static int oss_do_get(int *left
, int *right
, int fd
, int ch
) {
86 if(ioctl(fd
, SOUND_MIXER_READ(ch
), &r
) == -1) {
87 error(errno
, "error reading %s channel %s",
88 config
->mixer
, config
->channel
);
92 *right
= (r
>> 8) & 0xff;
96 /** @brief Get OSS volume */
97 static int oss_get(int *left
, int *right
) {
102 && (ch
= mixer_channel(config
->channel
)) != -1) {
103 if((fd
= oss_do_open()) < 0)
105 if(oss_do_get(left
, right
, fd
, ch
) < 0) {
115 /** @brief Set OSS volume */
116 static int oss_set(int *left
, int *right
) {
121 && (ch
= mixer_channel(config
->channel
)) != -1) {
122 if((fd
= oss_do_open()) < 0)
124 r
= (*left
& 0xff) + (*right
& 0xff) * 256;
125 if(ioctl(fd
, SOUND_MIXER_WRITE(ch
), &r
) == -1) {
126 error(errno
, "error changing %s channel %s",
127 config
->mixer
, config
->channel
);
131 if(oss_do_get(left
, right
, fd
, ch
) < 0) {
141 /** @brief OSS mixer vtable */
142 const struct mixer mixer_oss
= {