2 * This file is part of DisOrder
3 * Copyright (C) 2007, 2008 Richard Kettlewell
4 * Portions copyright (C) 2007 Ross Younger
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.
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.
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
21 /** @file server/speaker-oss.c
22 * @brief Support for @ref BACKEND_OSS */
26 #if HAVE_SYS_SOUNDCARD_H
36 #include <sys/ioctl.h>
37 #include <sys/soundcard.h>
39 #include "configuration.h"
42 #include "speaker-protocol.h"
45 /** @brief Current device */
46 static int ossfd = -1;
48 /** @brief OSS backend initialization */
49 static void oss_init(void) {
50 info("selected OSS backend");
53 /** @brief OSS deactivation */
54 static void oss_deactivate(void) {
58 device_state = device_closed;
59 D(("released audio device"));
63 /** @brief OSS backend activation */
64 static void oss_activate(void) {
65 int stereo, format, rate;
69 /* Try to pick a device */
70 if(!strcmp(config->device, "default")) {
71 if(access("/dev/dsp", W_OK) == 0)
73 else if(access("/dev/audio", W_OK) == 0)
74 device = "/dev/audio";
79 error(0, "cannot determine default OSS device");
85 device = config->device; /* just believe the user */
87 if((ossfd = open(device, O_WRONLY, 0)) < 0) {
88 error(errno, "error opening %s", device);
91 /* Set the audio format */
92 stereo = (config->sample_format.channels == 2);
93 if(ioctl(ossfd, SNDCTL_DSP_STEREO, &stereo) < 0) {
94 error(errno, "error calling ioctl SNDCTL_DSP_STEREO %d", stereo);
97 if(config->sample_format.bits == 8)
99 else if(config->sample_format.bits == 16)
100 format = (config->sample_format.endian == ENDIAN_LITTLE
101 ? AFMT_S16_LE : AFMT_S16_BE);
103 error(0, "unsupported sample_format for oss backend");
106 if(ioctl(ossfd, SNDCTL_DSP_SETFMT, &format) < 0) {
107 error(errno, "error calling ioctl SNDCTL_DSP_SETFMT %#x", format);
110 rate = config->sample_format.rate;
111 if(ioctl(ossfd, SNDCTL_DSP_SPEED, &rate) < 0) {
112 error(errno, "error calling ioctl SNDCTL_DSP_SPEED %d", rate);
115 if((unsigned)rate != config->sample_format.rate)
116 error(0, "asked for %luHz, got %dHz",
117 (unsigned long)config->sample_format.rate, rate);
119 device_state = device_open;
123 device_state = device_error;
130 /** @brief Play via OSS */
131 static size_t oss_play(size_t frames) {
132 const size_t bytes_to_play = frames * bpf;
133 ssize_t bytes_written;
135 bytes_written = write(ossfd, playing->buffer + playing->start,
137 if(bytes_written < 0)
139 case EINTR: /* interruped */
140 case EAGAIN: /* overrun */
141 return 0; /* try again later */
143 fatal(errno, "error writing to audio device");
145 return bytes_written / bpf;
150 /** @brief Fill in poll fd array for OSS */
151 static void oss_beforepoll(int attribute((unused)) *timeoutp) {
152 oss_slot = addfd(ossfd, POLLOUT|POLLERR);
155 /** @brief Process poll() results for OSS */
156 static int oss_ready(void) {
157 return !!(fds[oss_slot].revents & (POLLOUT|POLLERR));
160 const struct speaker_backend oss_backend = {