chiark / gitweb /
New scripts/setup which interactively sets up a DisOrder configuration
[disorder] / server / speaker-oss.c
CommitLineData
e99d42b1 1/*
2 * This file is part of DisOrder
3 * Copyright (C) 2007 Richard Kettlewell
313acc77 4 * Portions copyright (C) 2007 Ross Younger
e99d42b1 5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
19 * USA
20 */
21/** @file server/speaker-oss.c
22 * @brief Support for @ref BACKEND_OSS */
23
24#include <config.h>
25
26#if HAVE_SYS_SOUNDCARD_H
27
28#include "types.h"
29
30#include <unistd.h>
31#include <poll.h>
32#include <string.h>
33#include <fcntl.h>
34#include <unistd.h>
35#include <errno.h>
36#include <sys/ioctl.h>
37#include <sys/soundcard.h>
38
39#include "configuration.h"
40#include "syscalls.h"
41#include "log.h"
42#include "speaker-protocol.h"
43#include "speaker.h"
44
45/** @brief Current device */
46static int ossfd = -1;
47
48/** @brief OSS backend initialization */
49static void oss_init(void) {
50 info("selected OSS backend");
51}
52
53/** @brief OSS deactivation */
54static void oss_deactivate(void) {
55 if(ossfd != -1) {
56 xclose(ossfd);
57 ossfd = -1;
58 device_state = device_closed;
59 D(("released audio device"));
60 }
61}
62
63/** @brief OSS backend activation */
64static void oss_activate(void) {
65 int stereo, format, rate;
66 const char *device;
67
68 if(ossfd == -1) {
69 /* Try to pick a device */
70 if(!strcmp(config->device, "default")) {
71 if(access("/dev/dsp", W_OK) == 0)
72 device = "/dev/dsp";
73 else if(access("/dev/audio", W_OK) == 0)
74 device = "/dev/audio";
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RK
75 else {
76 error(0, "cannot determine default OSS device");
77 goto failed;
78 }
e99d42b1 79 } else
80 device = config->device; /* just believe the user */
81 /* Open the device */
82 if((ossfd = open(device, O_WRONLY, 0)) < 0) {
83 error(errno, "error opening %s", device);
84 goto failed;
85 }
86 /* Set the audio format */
87 stereo = (config->sample_format.channels == 2);
88 if(ioctl(ossfd, SNDCTL_DSP_STEREO, &stereo) < 0) {
89 error(errno, "error calling ioctl SNDCTL_DSP_STEREO %d", stereo);
90 goto failed;
91 }
92 if(config->sample_format.bits == 8)
93 format = AFMT_U8;
94 else if(config->sample_format.bits == 16)
95 format = (config->sample_format.endian == ENDIAN_LITTLE
96 ? AFMT_S16_LE : AFMT_S16_BE);
97 else {
98 error(0, "unsupported sample_format for oss backend");
99 goto failed;
100 }
101 if(ioctl(ossfd, SNDCTL_DSP_SETFMT, &format) < 0) {
102 error(errno, "error calling ioctl SNDCTL_DSP_SETFMT %#x", format);
103 goto failed;
104 }
105 rate = config->sample_format.rate;
106 if(ioctl(ossfd, SNDCTL_DSP_SPEED, &rate) < 0) {
107 error(errno, "error calling ioctl SNDCTL_DSP_SPEED %d", rate);
108 goto failed;
109 }
110 if((unsigned)rate != config->sample_format.rate)
111 error(0, "asked for %luHz, got %dHz",
112 (unsigned long)config->sample_format.rate, rate);
113 nonblock(ossfd);
114 device_state = device_open;
115 }
116 return;
117failed:
118 device_state = device_error;
c62ae947 119 if(ossfd >= 0) {
e99d42b1 120 xclose(ossfd);
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121 ossfd = -1;
122 }
e99d42b1 123}
124
125/** @brief Play via OSS */
126static size_t oss_play(size_t frames) {
127 const size_t bytes_to_play = frames * bpf;
128 ssize_t bytes_written;
129
130 bytes_written = write(ossfd, playing->buffer + playing->start,
131 bytes_to_play);
132 if(bytes_written < 0)
133 switch(errno) {
134 case EINTR: /* interruped */
135 case EAGAIN: /* overrun */
136 return 0; /* try again later */
137 default:
138 fatal(errno, "error writing to audio device");
139 }
140 return bytes_written / bpf;
141}
142
143static int oss_slot;
144
145/** @brief Fill in poll fd array for OSS */
e84fb5f0 146static void oss_beforepoll(int attribute((unused)) *timeoutp) {
e99d42b1 147 oss_slot = addfd(ossfd, POLLOUT|POLLERR);
148}
149
150/** @brief Process poll() results for OSS */
151static int oss_ready(void) {
152 return !!(fds[oss_slot].revents & (POLLOUT|POLLERR));
153}
154
155const struct speaker_backend oss_backend = {
156 BACKEND_OSS,
157 0,
158 oss_init,
159 oss_activate,
160 oss_play,
161 oss_deactivate,
162 oss_beforepoll,
163 oss_ready
164};
165
166#endif
167
168/*
169Local Variables:
170c-basic-offset:2
171comment-column:40
172fill-column:79
173indent-tabs-mode:nil
174End:
175*/