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 = {