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 3 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU 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, see <http://www.gnu.org/licenses/>.
18 /** @file lib/mixer-oss.c
19 * @brief OSS mixer support
21 * Mono output devices aren't explicitly supported (but may work
27 #if HAVE_SYS_SOUNDCARD_H
33 #include <sys/ioctl.h>
34 #include <sys/soundcard.h>
36 #include "configuration.h"
42 /* documentation does not match implementation! */
43 #ifndef SOUND_MIXER_READ
44 # define SOUND_MIXER_READ(x) MIXER_READ(x)
46 #ifndef SOUND_MIXER_WRITE
47 # define SOUND_MIXER_WRITE(x) MIXER_WRITE(x)
50 /** @brief Channel names */
51 static const char *channels[] = SOUND_DEVICE_NAMES;
53 /** @brief Convert channel name to number */
54 static int mixer_channel(const char *c) {
57 if(!c[strspn(c, "0123456789")])
60 for(n = 0; n < sizeof channels / sizeof *channels; ++n)
61 if(!strcmp(channels[n], c))
67 /** @brief Open the OSS mixer device and return its fd */
68 static int oss_do_open(void) {
71 if((fd = open(config->mixer, O_RDWR, 0)) < 0) {
72 static char *reported;
74 if(!reported || strcmp(reported, config->mixer)) {
77 reported = xstrdup(config->mixer);
78 error(errno, "error opening %s", config->mixer);
84 /** @brief Get the OSS mixer setting */
85 static int oss_do_get(int *left, int *right, int fd, int ch) {
88 if(ioctl(fd, SOUND_MIXER_READ(ch), &r) == -1) {
89 error(errno, "error reading %s channel %s",
90 config->mixer, config->channel);
94 *right = (r >> 8) & 0xff;
98 /** @brief Get OSS volume */
99 static int oss_get(int *left, int *right) {
104 && (ch = mixer_channel(config->channel)) != -1) {
105 if((fd = oss_do_open()) < 0)
107 if(oss_do_get(left, right, fd, ch) < 0) {
117 /** @brief Set OSS volume */
118 static int oss_set(int *left, int *right) {
123 && (ch = mixer_channel(config->channel)) != -1) {
124 if((fd = oss_do_open()) < 0)
126 r = (*left & 0xff) + (*right & 0xff) * 256;
127 if(ioctl(fd, SOUND_MIXER_WRITE(ch), &r) == -1) {
128 error(errno, "error changing %s channel %s",
129 config->mixer, config->channel);
133 if(oss_do_get(left, right, fd, ch) < 0) {
143 /** @brief OSS mixer vtable */
144 const struct mixer mixer_oss = {