2 * This file is part of DisOrder
3 * Copyright (C) 2004, 2007, 2008 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"
49 /* documentation does not match implementation! */
50 #ifndef SOUND_MIXER_READ
51 # define SOUND_MIXER_READ(x) MIXER_READ(x)
53 #ifndef SOUND_MIXER_WRITE
54 # define SOUND_MIXER_WRITE(x) MIXER_WRITE(x)
57 /** @brief Channel names */
58 static const char *channels[] = SOUND_DEVICE_NAMES;
60 /** @brief Convert channel name to number */
61 static int mixer_channel(const char *c) {
64 if(!c[strspn(c, "0123456789")])
67 for(n = 0; n < sizeof channels / sizeof *channels; ++n)
68 if(!strcmp(channels[n], c))
74 /** @brief Open the OSS mixer device and return its fd */
75 static int oss_do_open(void) {
78 if((fd = open(config->mixer, O_RDWR, 0)) < 0) {
79 static char *reported;
81 if(!reported || strcmp(reported, config->mixer)) {
84 reported = xstrdup(config->mixer);
85 error(errno, "error opening %s", config->mixer);
91 /** @brief Get the OSS mixer setting */
92 static int oss_do_get(int *left, int *right, int fd, int ch) {
95 if(ioctl(fd, SOUND_MIXER_READ(ch), &r) == -1) {
96 error(errno, "error reading %s channel %s",
97 config->mixer, config->channel);
101 *right = (r >> 8) & 0xff;
105 /** @brief Get OSS volume */
106 static int oss_get(int *left, int *right) {
111 && (ch = mixer_channel(config->channel)) != -1) {
112 if((fd = oss_do_open()) < 0)
114 if(oss_do_get(left, right, fd, ch) < 0) {
124 /** @brief Set OSS volume */
125 static int oss_set(int *left, int *right) {
130 && (ch = mixer_channel(config->channel)) != -1) {
131 if((fd = oss_do_open()) < 0)
133 r = (*left & 0xff) + (*right & 0xff) * 256;
134 if(ioctl(fd, SOUND_MIXER_WRITE(ch), &r) == -1) {
135 error(errno, "error changing %s channel %s",
136 config->mixer, config->channel);
140 if(oss_do_get(left, right, fd, ch) < 0) {
150 /** @brief OSS mixer vtable */
151 const struct mixer mixer_oss = {