2 * This file is part of DisOrder
3 * Copyright (C) 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 server/speaker-oss.c
21 * @brief Support for @ref BACKEND_OSS */
25 #if HAVE_SYS_SOUNDCARD_H
35 #include <sys/ioctl.h>
36 #include <sys/soundcard.h>
38 #include "configuration.h"
41 #include "speaker-protocol.h"
44 /** @brief Current device */
45 static int ossfd
= -1;
47 /** @brief OSS backend initialization */
48 static void oss_init(void) {
49 info("selected OSS backend");
52 /** @brief OSS deactivation */
53 static void oss_deactivate(void) {
57 device_state
= device_closed
;
58 D(("released audio device"));
62 /** @brief OSS backend activation */
63 static void oss_activate(void) {
64 int stereo
, format
, rate
;
68 /* Try to pick a device */
69 if(!strcmp(config
->device
, "default")) {
70 if(access("/dev/dsp", W_OK
) == 0)
72 else if(access("/dev/audio", W_OK
) == 0)
73 device
= "/dev/audio";
75 device
= config
->device
; /* just believe the user */
77 if((ossfd
= open(device
, O_WRONLY
, 0)) < 0) {
78 error(errno
, "error opening %s", device
);
81 /* Set the audio format */
82 stereo
= (config
->sample_format
.channels
== 2);
83 if(ioctl(ossfd
, SNDCTL_DSP_STEREO
, &stereo
) < 0) {
84 error(errno
, "error calling ioctl SNDCTL_DSP_STEREO %d", stereo
);
87 if(config
->sample_format
.bits
== 8)
89 else if(config
->sample_format
.bits
== 16)
90 format
= (config
->sample_format
.endian
== ENDIAN_LITTLE
91 ? AFMT_S16_LE
: AFMT_S16_BE
);
93 error(0, "unsupported sample_format for oss backend");
96 if(ioctl(ossfd
, SNDCTL_DSP_SETFMT
, &format
) < 0) {
97 error(errno
, "error calling ioctl SNDCTL_DSP_SETFMT %#x", format
);
100 rate
= config
->sample_format
.rate
;
101 if(ioctl(ossfd
, SNDCTL_DSP_SPEED
, &rate
) < 0) {
102 error(errno
, "error calling ioctl SNDCTL_DSP_SPEED %d", rate
);
105 if((unsigned)rate
!= config
->sample_format
.rate
)
106 error(0, "asked for %luHz, got %dHz",
107 (unsigned long)config
->sample_format
.rate
, rate
);
109 device_state
= device_open
;
113 device_state
= device_error
;
118 /** @brief Play via OSS */
119 static size_t oss_play(size_t frames
) {
120 const size_t bytes_to_play
= frames
* bpf
;
121 ssize_t bytes_written
;
123 bytes_written
= write(ossfd
, playing
->buffer
+ playing
->start
,
125 if(bytes_written
< 0)
127 case EINTR
: /* interruped */
128 case EAGAIN
: /* overrun */
129 return 0; /* try again later */
131 fatal(errno
, "error writing to audio device");
133 return bytes_written
/ bpf
;
138 /** @brief Fill in poll fd array for OSS */
139 static void oss_beforepoll(void) {
140 oss_slot
= addfd(ossfd
, POLLOUT
|POLLERR
);
143 /** @brief Process poll() results for OSS */
144 static int oss_ready(void) {
145 return !!(fds
[oss_slot
].revents
& (POLLOUT
|POLLERR
));
148 const struct speaker_backend oss_backend
= {