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7a2c7068 RK |
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> | |
7a2c7068 RK |
28 | #include <fcntl.h> |
29 | #include <unistd.h> | |
30 | #include <errno.h> | |
b1f6ca8c | 31 | #include <time.h> |
7a2c7068 RK |
32 | |
33 | #include "mem.h" | |
34 | #include "log.h" | |
b60e20be | 35 | #include "uaudio.h" |
ba70caca | 36 | #include "configuration.h" |
7a2c7068 | 37 | |
4fd38868 RK |
38 | #ifndef AFMT_U16_NE |
39 | # if BYTE_ORDER == BIG_ENDIAN | |
40 | # define AFMT_U16_NE AFMT_U16_BE | |
41 | # else | |
42 | # define AFMT_U16_NE AFMT_U16_LE | |
43 | # endif | |
44 | #endif | |
b60e20be | 45 | |
b50cfb8a RK |
46 | /* documentation does not match implementation! */ |
47 | #ifndef SOUND_MIXER_READ | |
48 | # define SOUND_MIXER_READ(x) MIXER_READ(x) | |
49 | #endif | |
50 | #ifndef SOUND_MIXER_WRITE | |
51 | # define SOUND_MIXER_WRITE(x) MIXER_WRITE(x) | |
52 | #endif | |
53 | ||
4fd38868 | 54 | static int oss_fd = -1; |
b50cfb8a RK |
55 | static int oss_mixer_fd = -1; |
56 | static int oss_mixer_channel; | |
7a2c7068 RK |
57 | |
58 | static const char *const oss_options[] = { | |
59 | "device", | |
b50cfb8a RK |
60 | "mixer-device", |
61 | "mixer-channel", | |
7a2c7068 RK |
62 | NULL |
63 | }; | |
64 | ||
4fd38868 RK |
65 | /** @brief Open the OSS sound device */ |
66 | static void oss_open(void) { | |
b50cfb8a | 67 | const char *device = uaudio_get("device", NULL); |
7a2c7068 RK |
68 | |
69 | #if EMPEG_HOST | |
4fd38868 | 70 | if(!device || !*device || !strcmp(device, "default")) |
9c6d5d95 | 71 | device = "/dev/audio"; |
7a2c7068 | 72 | #else |
4fd38868 RK |
73 | if(!device || !*device || !strcmp(device, "default")) { |
74 | if(access("/dev/dsp", W_OK) == 0) | |
75 | device = "/dev/dsp"; | |
7a2c7068 | 76 | else |
4fd38868 | 77 | device = "/dev/audio"; |
7a2c7068 | 78 | } |
4fd38868 RK |
79 | #endif |
80 | if((oss_fd = open(device, O_WRONLY, 0)) < 0) | |
2e9ba080 | 81 | disorder_fatal(errno, "error opening %s", device); |
4fd38868 RK |
82 | #if !EMPEG_HOST |
83 | int stereo = (uaudio_channels == 2), format; | |
84 | if(ioctl(oss_fd, SNDCTL_DSP_STEREO, &stereo) < 0) | |
2e9ba080 | 85 | disorder_fatal(errno, "error calling ioctl SNDCTL_DSP_STEREO %d", stereo); |
4fd38868 RK |
86 | if(uaudio_bits == 16) |
87 | format = uaudio_signed ? AFMT_S16_NE : AFMT_U16_NE; | |
88 | else | |
89 | format = uaudio_signed ? AFMT_S8 : AFMT_U8; | |
90 | if(ioctl(oss_fd, SNDCTL_DSP_SETFMT, &format) < 0) | |
2e9ba080 | 91 | disorder_fatal(errno, "error calling ioctl SNDCTL_DSP_SETFMT %#x", format); |
4fd38868 RK |
92 | int rate = uaudio_rate; |
93 | if(ioctl(oss_fd, SNDCTL_DSP_SPEED, &rate) < 0) | |
2e9ba080 | 94 | disorder_fatal(errno, "error calling ioctl SNDCTL_DSP_SPEED %d", rate); |
4fd38868 | 95 | if(rate != uaudio_rate) |
c04511f6 | 96 | disorder_error(0, "asked for %dHz, got %dHz", uaudio_rate, rate); |
4fd38868 RK |
97 | #endif |
98 | } | |
99 | ||
b1f6ca8c RK |
100 | /** @brief Close the OSS sound device */ |
101 | static void oss_close(void) { | |
102 | if(oss_fd != -1) { | |
103 | close(oss_fd); | |
104 | oss_fd = -1; | |
105 | } | |
7a2c7068 RK |
106 | } |
107 | ||
b1f6ca8c RK |
108 | /** @brief Actually play sound via OSS */ |
109 | static size_t oss_play(void *buffer, size_t samples, unsigned flags) { | |
110 | /* cf uaudio-alsa.c:alsa-play() */ | |
111 | if(flags & UAUDIO_PAUSED) { | |
112 | if(flags & UAUDIO_PAUSE) | |
113 | oss_close(); | |
114 | if(samples > 64) | |
115 | samples /= 2; | |
116 | const uint64_t ns = ((uint64_t)samples * 1000000000 | |
117 | / (uaudio_rate * uaudio_channels)); | |
118 | struct timespec ts[1]; | |
119 | ts->tv_sec = ns / 1000000000; | |
120 | ts->tv_nsec = ns % 1000000000; | |
121 | while(nanosleep(ts, ts) < 0 && errno == EINTR) | |
122 | ; | |
123 | return samples; | |
124 | } | |
125 | if(flags & UAUDIO_RESUME) | |
126 | oss_open(); | |
127 | const size_t bytes = samples * uaudio_sample_size; | |
128 | int rc = write(oss_fd, buffer, bytes); | |
129 | if(rc < 0) | |
2e9ba080 | 130 | disorder_fatal(errno, "error writing to sound device"); |
b1f6ca8c | 131 | return rc / uaudio_sample_size; |
7a2c7068 | 132 | } |
b1f6ca8c | 133 | |
b60e20be RK |
134 | static void oss_start(uaudio_callback *callback, |
135 | void *userdata) { | |
4fd38868 | 136 | if(uaudio_channels != 1 && uaudio_channels != 2) |
2e9ba080 | 137 | disorder_fatal(0, "asked for %d channels but only support 1 or 2", |
4fd38868 RK |
138 | uaudio_channels); |
139 | if(uaudio_bits != 8 && uaudio_bits != 16) | |
2e9ba080 | 140 | disorder_fatal(0, "asked for %d bits/channel but only support 8 or 16", |
4fd38868 RK |
141 | uaudio_bits); |
142 | #if EMPEG_HOST | |
143 | /* Very specific buffer size requirements here apparently */ | |
144 | uaudio_thread_start(callback, userdata, oss_play, | |
145 | 4608 / uaudio_sample_size, | |
63761c19 RK |
146 | 4608 / uaudio_sample_size, |
147 | 0); | |
4fd38868 RK |
148 | #else |
149 | /* We could SNDCTL_DSP_GETBLKSIZE but only when the device is already open, | |
150 | * which is kind of inconvenient. We go with 1-4Kbyte for now. */ | |
151 | uaudio_thread_start(callback, userdata, oss_play, | |
152 | 32 / uaudio_sample_size, | |
63761c19 RK |
153 | 4096 / uaudio_sample_size, |
154 | 0); | |
4fd38868 | 155 | #endif |
b60e20be RK |
156 | } |
157 | ||
158 | static void oss_stop(void) { | |
4fd38868 | 159 | uaudio_thread_stop(); |
b1f6ca8c | 160 | oss_close(); /* might not have been paused */ |
b60e20be | 161 | } |
7a2c7068 | 162 | |
b50cfb8a RK |
163 | /** @brief Channel names */ |
164 | static const char *oss_channels[] = SOUND_DEVICE_NAMES; | |
165 | ||
166 | static int oss_mixer_find_channel(const char *channel) { | |
42f738c2 | 167 | if(!channel[strspn(channel, "0123456789")]) |
b50cfb8a RK |
168 | return atoi(channel); |
169 | else { | |
42f738c2 RK |
170 | for(unsigned n = 0; n < sizeof oss_channels / sizeof *oss_channels; ++n) |
171 | if(!strcmp(oss_channels[n], channel)) | |
b50cfb8a RK |
172 | return n; |
173 | return -1; | |
174 | } | |
175 | } | |
176 | ||
177 | static void oss_open_mixer(void) { | |
178 | const char *mixer = uaudio_get("mixer-device", "/dev/mixer"); | |
179 | /* TODO infer mixer-device from device */ | |
180 | if((oss_mixer_fd = open(mixer, O_RDWR, 0)) < 0) | |
2e9ba080 | 181 | disorder_fatal(errno, "error opening %s", mixer); |
b50cfb8a RK |
182 | const char *channel = uaudio_get("mixer-channel", "pcm"); |
183 | oss_mixer_channel = oss_mixer_find_channel(channel); | |
184 | if(oss_mixer_channel < 0) | |
2e9ba080 | 185 | disorder_fatal(0, "no such channel as '%s'", channel); |
b50cfb8a RK |
186 | } |
187 | ||
188 | static void oss_close_mixer(void) { | |
189 | close(oss_mixer_fd); | |
190 | oss_mixer_fd = -1; | |
191 | } | |
192 | ||
193 | static void oss_get_volume(int *left, int *right) { | |
194 | int r; | |
195 | ||
196 | *left = *right = 0; | |
42f738c2 | 197 | if(ioctl(oss_mixer_fd, SOUND_MIXER_READ(oss_mixer_channel), &r) < 0) |
2e9ba080 | 198 | disorder_error(errno, "error getting volume"); |
b50cfb8a RK |
199 | else { |
200 | *left = r & 0xff; | |
201 | *right = (r >> 8) & 0xff; | |
202 | } | |
203 | } | |
204 | ||
205 | static void oss_set_volume(int *left, int *right) { | |
206 | int r = (*left & 0xff) + (*right & 0xff) * 256; | |
42f738c2 | 207 | if(ioctl(oss_mixer_fd, SOUND_MIXER_WRITE(oss_mixer_channel), &r) == -1) |
2e9ba080 | 208 | disorder_error(errno, "error setting volume"); |
42f738c2 | 209 | else if(ioctl(oss_mixer_fd, SOUND_MIXER_READ(oss_mixer_channel), &r) < 0) |
2e9ba080 | 210 | disorder_error(errno, "error getting volume"); |
b50cfb8a RK |
211 | else { |
212 | *left = r & 0xff; | |
213 | *right = (r >> 8) & 0xff; | |
214 | } | |
215 | } | |
216 | ||
ba70caca RK |
217 | static void oss_configure(void) { |
218 | uaudio_set("device", config->device); | |
219 | uaudio_set("mixer-device", config->mixer); | |
220 | uaudio_set("mixer-channel", config->channel); | |
221 | } | |
222 | ||
7a2c7068 RK |
223 | const struct uaudio uaudio_oss = { |
224 | .name = "oss", | |
225 | .options = oss_options, | |
226 | .start = oss_start, | |
227 | .stop = oss_stop, | |
b1f6ca8c RK |
228 | .activate = uaudio_thread_activate, |
229 | .deactivate = uaudio_thread_deactivate, | |
b50cfb8a RK |
230 | .open_mixer = oss_open_mixer, |
231 | .close_mixer = oss_close_mixer, | |
232 | .get_volume = oss_get_volume, | |
233 | .set_volume = oss_set_volume, | |
ba70caca | 234 | .configure = oss_configure, |
06385470 | 235 | .flags = UAUDIO_API_CLIENT | UAUDIO_API_SERVER, |
7a2c7068 RK |
236 | }; |
237 | ||
238 | #endif | |
239 | ||
240 | /* | |
241 | Local Variables: | |
242 | c-basic-offset:2 | |
243 | comment-column:40 | |
244 | fill-column:79 | |
245 | indent-tabs-mode:nil | |
246 | End: | |
247 | */ |