| 1 | /* |
| 2 | * This file is part of DisOrder. |
| 3 | * Copyright (C) 2009 Richard Kettlewell |
| 4 | * |
| 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. |
| 9 | * |
| 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. |
| 14 | * |
| 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/>. |
| 17 | */ |
| 18 | /** @file lib/uaudio-oss.c |
| 19 | * @brief Support for OSS backend */ |
| 20 | #include "common.h" |
| 21 | |
| 22 | #if HAVE_SYS_SOUNDCARD_H || EMPEG_HOST |
| 23 | |
| 24 | #if HAVE_SYS_SOUNDCARD_H |
| 25 | # include <sys/soundcard.h> |
| 26 | #endif |
| 27 | #include <sys/ioctl.h> |
| 28 | #include <fcntl.h> |
| 29 | #include <unistd.h> |
| 30 | #include <errno.h> |
| 31 | |
| 32 | #include "mem.h" |
| 33 | #include "log.h" |
| 34 | #include "uaudio.h" |
| 35 | #include "configuration.h" |
| 36 | |
| 37 | #ifndef AFMT_U16_NE |
| 38 | # if BYTE_ORDER == BIG_ENDIAN |
| 39 | # define AFMT_U16_NE AFMT_U16_BE |
| 40 | # else |
| 41 | # define AFMT_U16_NE AFMT_U16_LE |
| 42 | # endif |
| 43 | #endif |
| 44 | |
| 45 | /* documentation does not match implementation! */ |
| 46 | #ifndef SOUND_MIXER_READ |
| 47 | # define SOUND_MIXER_READ(x) MIXER_READ(x) |
| 48 | #endif |
| 49 | #ifndef SOUND_MIXER_WRITE |
| 50 | # define SOUND_MIXER_WRITE(x) MIXER_WRITE(x) |
| 51 | #endif |
| 52 | |
| 53 | static int oss_fd = -1; |
| 54 | static int oss_mixer_fd = -1; |
| 55 | static int oss_mixer_channel; |
| 56 | |
| 57 | static const char *const oss_options[] = { |
| 58 | "device", |
| 59 | "mixer-device", |
| 60 | "mixer-channel", |
| 61 | NULL |
| 62 | }; |
| 63 | |
| 64 | /** @brief Actually play sound via OSS */ |
| 65 | static size_t oss_play(void *buffer, size_t samples) { |
| 66 | const size_t bytes = samples * uaudio_sample_size; |
| 67 | int rc = write(oss_fd, buffer, bytes); |
| 68 | if(rc < 0) |
| 69 | fatal(errno, "error writing to sound device"); |
| 70 | return rc / uaudio_sample_size; |
| 71 | } |
| 72 | |
| 73 | /** @brief Open the OSS sound device */ |
| 74 | static void oss_open(void) { |
| 75 | const char *device = uaudio_get("device", NULL); |
| 76 | |
| 77 | #if EMPEG_HOST |
| 78 | if(!device || !*device || !strcmp(device, "default")) |
| 79 | device "/dev/audio"; |
| 80 | #else |
| 81 | if(!device || !*device || !strcmp(device, "default")) { |
| 82 | if(access("/dev/dsp", W_OK) == 0) |
| 83 | device = "/dev/dsp"; |
| 84 | else |
| 85 | device = "/dev/audio"; |
| 86 | } |
| 87 | #endif |
| 88 | if((oss_fd = open(device, O_WRONLY, 0)) < 0) |
| 89 | fatal(errno, "error opening %s", device); |
| 90 | #if !EMPEG_HOST |
| 91 | int stereo = (uaudio_channels == 2), format; |
| 92 | if(ioctl(oss_fd, SNDCTL_DSP_STEREO, &stereo) < 0) |
| 93 | fatal(errno, "error calling ioctl SNDCTL_DSP_STEREO %d", stereo); |
| 94 | if(uaudio_bits == 16) |
| 95 | format = uaudio_signed ? AFMT_S16_NE : AFMT_U16_NE; |
| 96 | else |
| 97 | format = uaudio_signed ? AFMT_S8 : AFMT_U8; |
| 98 | if(ioctl(oss_fd, SNDCTL_DSP_SETFMT, &format) < 0) |
| 99 | fatal(errno, "error calling ioctl SNDCTL_DSP_SETFMT %#x", format); |
| 100 | int rate = uaudio_rate; |
| 101 | if(ioctl(oss_fd, SNDCTL_DSP_SPEED, &rate) < 0) |
| 102 | fatal(errno, "error calling ioctl SNDCTL_DSP_SPEED %d", rate); |
| 103 | if(rate != uaudio_rate) |
| 104 | error(0, "asked for %dHz, got %dHz", uaudio_rate, rate); |
| 105 | #endif |
| 106 | } |
| 107 | |
| 108 | static void oss_activate(void) { |
| 109 | oss_open(); |
| 110 | uaudio_thread_activate(); |
| 111 | } |
| 112 | |
| 113 | static void oss_deactivate(void) { |
| 114 | uaudio_thread_deactivate(); |
| 115 | close(oss_fd); |
| 116 | oss_fd = -1; |
| 117 | } |
| 118 | |
| 119 | static void oss_start(uaudio_callback *callback, |
| 120 | void *userdata) { |
| 121 | if(uaudio_channels != 1 && uaudio_channels != 2) |
| 122 | fatal(0, "asked for %d channels but only support 1 or 2", |
| 123 | uaudio_channels); |
| 124 | if(uaudio_bits != 8 && uaudio_bits != 16) |
| 125 | fatal(0, "asked for %d bits/channel but only support 8 or 16", |
| 126 | uaudio_bits); |
| 127 | #if EMPEG_HOST |
| 128 | /* Very specific buffer size requirements here apparently */ |
| 129 | uaudio_thread_start(callback, userdata, oss_play, |
| 130 | 4608 / uaudio_sample_size, |
| 131 | 4608 / uaudio_sample_size, |
| 132 | 0); |
| 133 | #else |
| 134 | /* We could SNDCTL_DSP_GETBLKSIZE but only when the device is already open, |
| 135 | * which is kind of inconvenient. We go with 1-4Kbyte for now. */ |
| 136 | uaudio_thread_start(callback, userdata, oss_play, |
| 137 | 32 / uaudio_sample_size, |
| 138 | 4096 / uaudio_sample_size, |
| 139 | 0); |
| 140 | #endif |
| 141 | } |
| 142 | |
| 143 | static void oss_stop(void) { |
| 144 | uaudio_thread_stop(); |
| 145 | } |
| 146 | |
| 147 | /** @brief Channel names */ |
| 148 | static const char *oss_channels[] = SOUND_DEVICE_NAMES; |
| 149 | |
| 150 | static int oss_mixer_find_channel(const char *channel) { |
| 151 | if(!channel[strspn(channel, "0123456789")]) |
| 152 | return atoi(channel); |
| 153 | else { |
| 154 | for(unsigned n = 0; n < sizeof oss_channels / sizeof *oss_channels; ++n) |
| 155 | if(!strcmp(oss_channels[n], channel)) |
| 156 | return n; |
| 157 | return -1; |
| 158 | } |
| 159 | } |
| 160 | |
| 161 | static void oss_open_mixer(void) { |
| 162 | const char *mixer = uaudio_get("mixer-device", "/dev/mixer"); |
| 163 | /* TODO infer mixer-device from device */ |
| 164 | if((oss_mixer_fd = open(mixer, O_RDWR, 0)) < 0) |
| 165 | fatal(errno, "error opening %s", mixer); |
| 166 | const char *channel = uaudio_get("mixer-channel", "pcm"); |
| 167 | oss_mixer_channel = oss_mixer_find_channel(channel); |
| 168 | if(oss_mixer_channel < 0) |
| 169 | fatal(0, "no such channel as '%s'", channel); |
| 170 | } |
| 171 | |
| 172 | static void oss_close_mixer(void) { |
| 173 | close(oss_mixer_fd); |
| 174 | oss_mixer_fd = -1; |
| 175 | } |
| 176 | |
| 177 | static void oss_get_volume(int *left, int *right) { |
| 178 | int r; |
| 179 | |
| 180 | *left = *right = 0; |
| 181 | if(ioctl(oss_mixer_fd, SOUND_MIXER_READ(oss_mixer_channel), &r) < 0) |
| 182 | error(errno, "error getting volume"); |
| 183 | else { |
| 184 | *left = r & 0xff; |
| 185 | *right = (r >> 8) & 0xff; |
| 186 | } |
| 187 | } |
| 188 | |
| 189 | static void oss_set_volume(int *left, int *right) { |
| 190 | int r = (*left & 0xff) + (*right & 0xff) * 256; |
| 191 | if(ioctl(oss_mixer_fd, SOUND_MIXER_WRITE(oss_mixer_channel), &r) == -1) |
| 192 | error(errno, "error setting volume"); |
| 193 | else if(ioctl(oss_mixer_fd, SOUND_MIXER_READ(oss_mixer_channel), &r) < 0) |
| 194 | error(errno, "error getting volume"); |
| 195 | else { |
| 196 | *left = r & 0xff; |
| 197 | *right = (r >> 8) & 0xff; |
| 198 | } |
| 199 | } |
| 200 | |
| 201 | static void oss_configure(void) { |
| 202 | uaudio_set("device", config->device); |
| 203 | uaudio_set("mixer-device", config->mixer); |
| 204 | uaudio_set("mixer-channel", config->channel); |
| 205 | } |
| 206 | |
| 207 | const struct uaudio uaudio_oss = { |
| 208 | .name = "oss", |
| 209 | .options = oss_options, |
| 210 | .start = oss_start, |
| 211 | .stop = oss_stop, |
| 212 | .activate = oss_activate, |
| 213 | .deactivate = oss_deactivate, |
| 214 | .open_mixer = oss_open_mixer, |
| 215 | .close_mixer = oss_close_mixer, |
| 216 | .get_volume = oss_get_volume, |
| 217 | .set_volume = oss_set_volume, |
| 218 | .configure = oss_configure, |
| 219 | }; |
| 220 | |
| 221 | #endif |
| 222 | |
| 223 | /* |
| 224 | Local Variables: |
| 225 | c-basic-offset:2 |
| 226 | comment-column:40 |
| 227 | fill-column:79 |
| 228 | indent-tabs-mode:nil |
| 229 | End: |
| 230 | */ |