| 1 | /* |
| 2 | * This file is part of DisOrder |
| 3 | * Copyright (C) 2007, 2008 Richard Kettlewell |
| 4 | * Portions copyright (C) 2007 Ross Younger |
| 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 3 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, |
| 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. |
| 15 | * |
| 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/>. |
| 18 | */ |
| 19 | /** @file server/speaker-oss.c |
| 20 | * @brief Support for @ref BACKEND_OSS */ |
| 21 | |
| 22 | #include "common.h" |
| 23 | |
| 24 | #if HAVE_SYS_SOUNDCARD_H |
| 25 | |
| 26 | #include <unistd.h> |
| 27 | #include <poll.h> |
| 28 | #include <fcntl.h> |
| 29 | #include <unistd.h> |
| 30 | #include <errno.h> |
| 31 | #include <sys/ioctl.h> |
| 32 | #include <sys/soundcard.h> |
| 33 | |
| 34 | #include "configuration.h" |
| 35 | #include "syscalls.h" |
| 36 | #include "log.h" |
| 37 | #include "speaker-protocol.h" |
| 38 | #include "speaker.h" |
| 39 | |
| 40 | /** @brief Current device */ |
| 41 | static int ossfd = -1; |
| 42 | |
| 43 | /** @brief OSS backend initialization */ |
| 44 | static void oss_init(void) { |
| 45 | info("selected OSS backend"); |
| 46 | } |
| 47 | |
| 48 | /** @brief OSS deactivation */ |
| 49 | static void oss_deactivate(void) { |
| 50 | if(ossfd != -1) { |
| 51 | xclose(ossfd); |
| 52 | ossfd = -1; |
| 53 | device_state = device_closed; |
| 54 | D(("released audio device")); |
| 55 | } |
| 56 | } |
| 57 | |
| 58 | /** @brief OSS backend activation */ |
| 59 | static void oss_activate(void) { |
| 60 | int stereo, format, rate; |
| 61 | const char *device; |
| 62 | |
| 63 | if(ossfd == -1) { |
| 64 | /* Try to pick a device */ |
| 65 | if(!strcmp(config->device, "default")) { |
| 66 | if(access("/dev/dsp", W_OK) == 0) |
| 67 | device = "/dev/dsp"; |
| 68 | else if(access("/dev/audio", W_OK) == 0) |
| 69 | device = "/dev/audio"; |
| 70 | else { |
| 71 | static int reported; |
| 72 | |
| 73 | if(!reported) { |
| 74 | error(0, "cannot determine default OSS device"); |
| 75 | reported = 1; |
| 76 | } |
| 77 | goto failed; |
| 78 | } |
| 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; |
| 117 | failed: |
| 118 | device_state = device_error; |
| 119 | if(ossfd >= 0) { |
| 120 | xclose(ossfd); |
| 121 | ossfd = -1; |
| 122 | } |
| 123 | } |
| 124 | |
| 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; |
| 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 | |
| 143 | static int oss_slot; |
| 144 | |
| 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); |
| 148 | } |
| 149 | |
| 150 | /** @brief Process poll() results for OSS */ |
| 151 | static int oss_ready(void) { |
| 152 | return !!(fds[oss_slot].revents & (POLLOUT|POLLERR)); |
| 153 | } |
| 154 | |
| 155 | const 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 | /* |
| 169 | Local Variables: |
| 170 | c-basic-offset:2 |
| 171 | comment-column:40 |
| 172 | fill-column:79 |
| 173 | indent-tabs-mode:nil |
| 174 | End: |
| 175 | */ |