2 * This file is part of DisOrder.
3 * Copyright (C) 2009 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/uaudio-oss.c
19 * @brief Support for OSS backend */
22 #if HAVE_SYS_SOUNDCARD_H || EMPEG_HOST
24 #if HAVE_SYS_SOUNDCARD_H
25 # include <sys/soundcard.h>
27 #include <sys/ioctl.h>
32 #include <arpa/inet.h>
38 static int oss_fd
= -1;
39 static pthread_t oss_thread
;
40 static uaudio_callback
*oss_callback
;
41 static int oss_started
;
42 static int oss_activated
;
44 static pthread_mutex_t oss_lock
= PTHREAD_MUTEX_INITIALIZER
;
45 static pthread_cond_t oss_cond
= PTHREAD_COND_INITIALIZER
;
46 static int oss_bufsize
;
48 static const char *const oss_options
[] = {
53 static void *oss_thread(void *userdata
) {
55 pthread_mutex_lock(&oss_lock
);
56 buffer
= xmalloc(XXX
);
58 while(oss_started
&& !oss_activated
)
59 pthread_cond_wait(&oss_cond
, &oss_lock
);
62 /* We are definitely active now */
64 pthread_cond_signal(&oss_cond
);
65 while(oss_activated
) {
66 const int nsamples
= oss_callback(buffer
, oss_bufsizeXXX
, userdata
);;
67 if(write(oss_fd
, buffer
, XXX
) < 0)
68 fatal(errno
, "error playing audio");
72 pthread_cond_signal(&oss_cond
);
74 pthread_mutex_unlock(&oss_lock
);
78 static void oss_start(uaudio_callback
*callback
,
81 oss_callback
= callback
;
82 if((e
= pthread_create(&oss_thread
,
86 fatal(e
, "pthread_create");
89 static void oss_stop(void) {
93 pthread_mutex_lock(&oss_lock
);
95 pthread_cond_signal(&oss_cond
);
96 pthread_mutex_unlock(&oss_lock
);
97 pthread_join(oss_thread
, &result
);
100 static void oss_activate(void) {
101 pthread_mutex_lock(&oss_lock
);
103 const char *device
= uaudio_get(&uadiuo_oss
, "device");
106 if(!device
|| !*device
|| !strcmp(device
, "default")) {
109 if(!device
|| !*device
|| !strcmp(device
, "default")) {
110 if(access("/dev/dsp", W_OK
) == 0)
113 device
= "/dev/audio";
116 if((oss_fd
= open(device
, O_WRONLY
, 0)) < 0)
117 fatal(errno
, "error opening %s", device
);
119 /* empeg audio driver only knows /dev/audio, only supports the equivalent
120 * of AFMT_S16_NE, has a fixed buffer size, and does not support the
124 int stereo
= (config
->sample_format
.channels
== 2), format
, rate
;
125 if(ioctl(ossfd
, SNDCTL_DSP_STEREO
, &stereo
) < 0) {
126 error(errno
, "error calling ioctl SNDCTL_DSP_STEREO %d", stereo
);
129 /* TODO we need to think about where we decide this */
130 if(config
->sample_format
.bits
== 8)
132 else if(config
->sample_format
.bits
== 16)
133 format
= (config
->sample_format
.endian
== ENDIAN_LITTLE
134 ? AFMT_S16_LE
: AFMT_S16_BE
);
136 fatal(0, "unsupported sample_format for oss backend");
137 if(ioctl(oss_fd
, SNDCTL_DSP_SETFMT
, &format
) < 0)
138 fatal(errno
, "error calling ioctl SNDCTL_DSP_SETFMT %#x", format
);
139 rate
= config
->sample_format
.rate
;
140 if(ioctl(oss_fd
, SNDCTL_DSP_SPEED
, &rate
) < 0)
141 fatal(errno
, "error calling ioctl SNDCTL_DSP_SPEED %d", rate
);
142 if((unsigned)rate
!= config
->sample_format
.rate
)
143 error(0, "asked for %luHz, got %dHz",
144 (unsigned long)config
->sample_format
.rate
, rate
);
145 if(ioctl(oss_fd
, SNDCTL_DSP_GETBLKSIZE
, &oss_bufsize
) < 0) {
146 error(errno
, "ioctl SNDCTL_DSP_GETBLKSIZE");
147 oss_bufsize
= 2048; /* guess */
151 pthread_cond_signal(&oss_cond
);
153 pthread_cond_wait(&oss_cond
, &oss_lock
);
155 pthread_mutex_unlock(&oss_lock
);
158 static void oss_deactivate(void) {
159 pthread_mutex_lock(&oss_lock
);
162 pthread_cond_signal(&oss_cond
);
164 pthread_cond_wait(&oss_cond
, &oss_lock
);
168 pthread_mutex_unlock(&oss_lock
);
171 const struct uaudio uaudio_oss
= {
173 .options
= oss_options
,
176 .activate
= oss_activate
,
177 .deactivate
= oss_deactivate