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 3 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU 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, see <http://www.gnu.org/licenses/>.
19 /** @file server/speaker-oss.c
20 * @brief Support for @ref BACKEND_OSS */
24 #if HAVE_SYS_SOUNDCARD_H
31 #include <sys/ioctl.h>
32 #include <sys/soundcard.h>
34 #include "configuration.h"
37 #include "speaker-protocol.h"
40 /** @brief Current device */
41 static int ossfd = -1;
43 /** @brief OSS backend initialization */
44 static void oss_init(void) {
45 info("selected OSS backend");
48 /** @brief OSS deactivation */
49 static void oss_deactivate(void) {
53 device_state = device_closed;
54 D(("released audio device"));
58 /** @brief OSS backend activation */
59 static void oss_activate(void) {
60 int stereo, format, rate;
64 /* Try to pick a device */
65 if(!strcmp(config->device, "default")) {
66 if(access("/dev/dsp", W_OK) == 0)
68 else if(access("/dev/audio", W_OK) == 0)
69 device = "/dev/audio";
74 error(0, "cannot determine default OSS device");
80 device = config->device; /* just believe the user */
82 if((ossfd = open(device, O_WRONLY, 0)) < 0) {
83 error(errno, "error opening %s", device);
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);
92 if(config->sample_format.bits == 8)
94 else if(config->sample_format.bits == 16)
95 format = (config->sample_format.endian == ENDIAN_LITTLE
96 ? AFMT_S16_LE : AFMT_S16_BE);
98 error(0, "unsupported sample_format for oss backend");
101 if(ioctl(ossfd, SNDCTL_DSP_SETFMT, &format) < 0) {
102 error(errno, "error calling ioctl SNDCTL_DSP_SETFMT %#x", format);
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);
110 if((unsigned)rate != config->sample_format.rate)
111 error(0, "asked for %luHz, got %dHz",
112 (unsigned long)config->sample_format.rate, rate);
114 device_state = device_open;
118 device_state = device_error;
125 /** @brief Play via OSS */
126 static size_t oss_play(size_t frames) {
127 const size_t bytes_to_play = frames * bpf;
128 ssize_t bytes_written;
130 bytes_written = write(ossfd, playing->buffer + playing->start,
132 if(bytes_written < 0)
134 case EINTR: /* interruped */
135 case EAGAIN: /* overrun */
136 return 0; /* try again later */
138 fatal(errno, "error writing to audio device");
140 return bytes_written / bpf;
145 /** @brief Fill in poll fd array for OSS */
146 static void oss_beforepoll(int attribute((unused)) *timeoutp) {
147 oss_slot = addfd(ossfd, POLLOUT|POLLERR);
150 /** @brief Process poll() results for OSS */
151 static int oss_ready(void) {
152 return !!(fds[oss_slot].revents & (POLLOUT|POLLERR));
155 const struct speaker_backend oss_backend = {