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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> | |
7a2c7068 RK |
31 | |
32 | #include "mem.h" | |
33 | #include "log.h" | |
b60e20be | 34 | #include "uaudio.h" |
7a2c7068 | 35 | |
4fd38868 RK |
36 | #ifndef AFMT_U16_NE |
37 | # if BYTE_ORDER == BIG_ENDIAN | |
38 | # define AFMT_U16_NE AFMT_U16_BE | |
39 | # else | |
40 | # define AFMT_U16_NE AFMT_U16_LE | |
41 | # endif | |
42 | #endif | |
b60e20be | 43 | |
4fd38868 | 44 | static int oss_fd = -1; |
7a2c7068 RK |
45 | |
46 | static const char *const oss_options[] = { | |
47 | "device", | |
48 | NULL | |
49 | }; | |
50 | ||
4fd38868 RK |
51 | /** @brief Actually play sound via OSS */ |
52 | static size_t oss_play(void *buffer, size_t samples) { | |
53 | const size_t bytes = samples * uaudio_sample_size; | |
54 | int rc = write(oss_fd, buffer, bytes); | |
55 | if(rc < 0) | |
56 | fatal(errno, "error writing to sound device"); | |
57 | return rc / uaudio_sample_size; | |
7a2c7068 RK |
58 | } |
59 | ||
4fd38868 RK |
60 | /** @brief Open the OSS sound device */ |
61 | static void oss_open(void) { | |
62 | const char *device = uaudio_get("device"); | |
7a2c7068 RK |
63 | |
64 | #if EMPEG_HOST | |
4fd38868 RK |
65 | if(!device || !*device || !strcmp(device, "default")) |
66 | device "/dev/audio"; | |
7a2c7068 | 67 | #else |
4fd38868 RK |
68 | if(!device || !*device || !strcmp(device, "default")) { |
69 | if(access("/dev/dsp", W_OK) == 0) | |
70 | device = "/dev/dsp"; | |
7a2c7068 | 71 | else |
4fd38868 | 72 | device = "/dev/audio"; |
7a2c7068 | 73 | } |
4fd38868 RK |
74 | #endif |
75 | if((oss_fd = open(device, O_WRONLY, 0)) < 0) | |
76 | fatal(errno, "error opening %s", device); | |
77 | #if !EMPEG_HOST | |
78 | int stereo = (uaudio_channels == 2), format; | |
79 | if(ioctl(oss_fd, SNDCTL_DSP_STEREO, &stereo) < 0) | |
80 | fatal(errno, "error calling ioctl SNDCTL_DSP_STEREO %d", stereo); | |
81 | if(uaudio_bits == 16) | |
82 | format = uaudio_signed ? AFMT_S16_NE : AFMT_U16_NE; | |
83 | else | |
84 | format = uaudio_signed ? AFMT_S8 : AFMT_U8; | |
85 | if(ioctl(oss_fd, SNDCTL_DSP_SETFMT, &format) < 0) | |
86 | fatal(errno, "error calling ioctl SNDCTL_DSP_SETFMT %#x", format); | |
87 | int rate = uaudio_rate; | |
88 | if(ioctl(oss_fd, SNDCTL_DSP_SPEED, &rate) < 0) | |
89 | fatal(errno, "error calling ioctl SNDCTL_DSP_SPEED %d", rate); | |
90 | if(rate != uaudio_rate) | |
91 | error(0, "asked for %dHz, got %dHz", uaudio_rate, rate); | |
92 | #endif | |
93 | } | |
94 | ||
95 | static void oss_activate(void) { | |
96 | oss_open(); | |
97 | uaudio_thread_activate(); | |
7a2c7068 RK |
98 | } |
99 | ||
100 | static void oss_deactivate(void) { | |
4fd38868 RK |
101 | uaudio_thread_deactivate(); |
102 | close(oss_fd); | |
103 | oss_fd = -1; | |
7a2c7068 | 104 | } |
b60e20be RK |
105 | |
106 | static void oss_start(uaudio_callback *callback, | |
107 | void *userdata) { | |
4fd38868 RK |
108 | if(uaudio_channels != 1 && uaudio_channels != 2) |
109 | fatal(0, "asked for %d channels but only support 1 or 2", | |
110 | uaudio_channels); | |
111 | if(uaudio_bits != 8 && uaudio_bits != 16) | |
112 | fatal(0, "asked for %d bits/channel but only support 8 or 16", | |
113 | uaudio_bits); | |
114 | #if EMPEG_HOST | |
115 | /* Very specific buffer size requirements here apparently */ | |
116 | uaudio_thread_start(callback, userdata, oss_play, | |
117 | 4608 / uaudio_sample_size, | |
118 | 4608 / uaudio_sample_size); | |
119 | #else | |
120 | /* We could SNDCTL_DSP_GETBLKSIZE but only when the device is already open, | |
121 | * which is kind of inconvenient. We go with 1-4Kbyte for now. */ | |
122 | uaudio_thread_start(callback, userdata, oss_play, | |
123 | 32 / uaudio_sample_size, | |
124 | 4096 / uaudio_sample_size); | |
125 | #endif | |
b60e20be RK |
126 | } |
127 | ||
128 | static void oss_stop(void) { | |
4fd38868 | 129 | uaudio_thread_stop(); |
b60e20be | 130 | } |
7a2c7068 RK |
131 | |
132 | const struct uaudio uaudio_oss = { | |
133 | .name = "oss", | |
134 | .options = oss_options, | |
135 | .start = oss_start, | |
136 | .stop = oss_stop, | |
137 | .activate = oss_activate, | |
138 | .deactivate = oss_deactivate | |
139 | }; | |
140 | ||
141 | #endif | |
142 | ||
143 | /* | |
144 | Local Variables: | |
145 | c-basic-offset:2 | |
146 | comment-column:40 | |
147 | fill-column:79 | |
148 | indent-tabs-mode:nil | |
149 | End: | |
150 | */ |