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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 <pthread.h> | |
29 | #include <fcntl.h> | |
30 | #include <unistd.h> | |
31 | #include <errno.h> | |
32 | #include <arpa/inet.h> | |
33 | ||
34 | #include "mem.h" | |
35 | #include "log.h" | |
36 | #include "syscalls.h" | |
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37 | #include "uaudio.h" |
38 | #include "configuration.h" | |
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39 | |
40 | static int oss_fd = -1; | |
41 | static pthread_t oss_thread; | |
42 | static uaudio_callback *oss_callback; | |
43 | static int oss_started; | |
44 | static int oss_activated; | |
45 | static int oss_going; | |
46 | static pthread_mutex_t oss_lock = PTHREAD_MUTEX_INITIALIZER; | |
47 | static pthread_cond_t oss_cond = PTHREAD_COND_INITIALIZER; | |
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48 | |
49 | /** @brief Buffer size in bytes */ | |
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50 | static int oss_bufsize; |
51 | ||
52 | static const char *const oss_options[] = { | |
53 | "device", | |
54 | NULL | |
55 | }; | |
56 | ||
b60e20be | 57 | static void *oss_thread_fn(void *userdata) { |
7a2c7068 RK |
58 | int16_t *buffer; |
59 | pthread_mutex_lock(&oss_lock); | |
b60e20be | 60 | buffer = xmalloc(oss_bufsize); |
7a2c7068 RK |
61 | while(oss_started) { |
62 | while(oss_started && !oss_activated) | |
63 | pthread_cond_wait(&oss_cond, &oss_lock); | |
64 | if(!oss_started) | |
65 | break; | |
66 | /* We are definitely active now */ | |
67 | oss_going = 1; | |
68 | pthread_cond_signal(&oss_cond); | |
69 | while(oss_activated) { | |
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70 | const int nsamples = oss_callback(buffer, |
71 | oss_bufsize / sizeof(int16_t), | |
72 | userdata); | |
73 | const int nbytes = nsamples * sizeof(int16_t); | |
74 | int written = 0; | |
75 | ||
76 | while(written < nsamples) { | |
77 | const int rc = write(oss_fd, buffer + written, nbytes - written); | |
78 | if(rc < 0) | |
79 | fatal(errno, "error playing audio"); | |
80 | written += rc; | |
81 | } | |
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82 | } |
83 | oss_going = 0; | |
84 | pthread_cond_signal(&oss_cond); | |
85 | } | |
86 | pthread_mutex_unlock(&oss_lock); | |
87 | return NULL; | |
88 | } | |
89 | ||
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90 | static void oss_activate(void) { |
91 | pthread_mutex_lock(&oss_lock); | |
92 | if(!oss_activated) { | |
b60e20be | 93 | const char *device = uaudio_get("device"); |
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94 | |
95 | #if EMPEG_HOST | |
96 | if(!device || !*device || !strcmp(device, "default")) { | |
97 | device "/dev/audio"; | |
98 | #else | |
99 | if(!device || !*device || !strcmp(device, "default")) { | |
100 | if(access("/dev/dsp", W_OK) == 0) | |
101 | device = "/dev/dsp"; | |
102 | else | |
103 | device = "/dev/audio"; | |
104 | } | |
105 | #endif | |
106 | if((oss_fd = open(device, O_WRONLY, 0)) < 0) | |
107 | fatal(errno, "error opening %s", device); | |
108 | #if EMPEG_HOST | |
109 | /* empeg audio driver only knows /dev/audio, only supports the equivalent | |
110 | * of AFMT_S16_NE, has a fixed buffer size, and does not support the | |
111 | * SNDCTL_ ioctls. */ | |
112 | oss_bufsize = 4608; | |
113 | #else | |
114 | int stereo = (config->sample_format.channels == 2), format, rate; | |
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115 | if(ioctl(oss_fd, SNDCTL_DSP_STEREO, &stereo) < 0) |
116 | fatal(errno, "error calling ioctl SNDCTL_DSP_STEREO %d", stereo); | |
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117 | /* TODO we need to think about where we decide this */ |
118 | if(config->sample_format.bits == 8) | |
119 | format = AFMT_U8; | |
120 | else if(config->sample_format.bits == 16) | |
121 | format = (config->sample_format.endian == ENDIAN_LITTLE | |
122 | ? AFMT_S16_LE : AFMT_S16_BE); | |
123 | else | |
124 | fatal(0, "unsupported sample_format for oss backend"); | |
125 | if(ioctl(oss_fd, SNDCTL_DSP_SETFMT, &format) < 0) | |
126 | fatal(errno, "error calling ioctl SNDCTL_DSP_SETFMT %#x", format); | |
127 | rate = config->sample_format.rate; | |
128 | if(ioctl(oss_fd, SNDCTL_DSP_SPEED, &rate) < 0) | |
129 | fatal(errno, "error calling ioctl SNDCTL_DSP_SPEED %d", rate); | |
130 | if((unsigned)rate != config->sample_format.rate) | |
131 | error(0, "asked for %luHz, got %dHz", | |
132 | (unsigned long)config->sample_format.rate, rate); | |
133 | if(ioctl(oss_fd, SNDCTL_DSP_GETBLKSIZE, &oss_bufsize) < 0) { | |
134 | error(errno, "ioctl SNDCTL_DSP_GETBLKSIZE"); | |
135 | oss_bufsize = 2048; /* guess */ | |
136 | } | |
137 | #endif | |
138 | oss_activated = 1; | |
139 | pthread_cond_signal(&oss_cond); | |
140 | while(!oss_going) | |
141 | pthread_cond_wait(&oss_cond, &oss_lock); | |
142 | } | |
143 | pthread_mutex_unlock(&oss_lock); | |
144 | } | |
145 | ||
146 | static void oss_deactivate(void) { | |
147 | pthread_mutex_lock(&oss_lock); | |
148 | if(oss_activated) { | |
149 | oss_activated = 0; | |
150 | pthread_cond_signal(&oss_cond); | |
151 | while(oss_going) | |
152 | pthread_cond_wait(&oss_cond, &oss_lock); | |
153 | close(oss_fd); | |
154 | oss_fd = -1; | |
155 | } | |
156 | pthread_mutex_unlock(&oss_lock); | |
157 | } | |
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158 | |
159 | static void oss_start(uaudio_callback *callback, | |
160 | void *userdata) { | |
161 | int e; | |
162 | oss_callback = callback; | |
163 | if((e = pthread_create(&oss_thread, | |
164 | NULL, | |
165 | oss_thread_fn, | |
166 | userdata))) | |
167 | fatal(e, "pthread_create"); | |
168 | } | |
169 | ||
170 | static void oss_stop(void) { | |
171 | void *result; | |
172 | ||
173 | oss_deactivate(); | |
174 | pthread_mutex_lock(&oss_lock); | |
175 | oss_started = 0; | |
176 | pthread_cond_signal(&oss_cond); | |
177 | pthread_mutex_unlock(&oss_lock); | |
178 | pthread_join(oss_thread, &result); | |
179 | } | |
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180 | |
181 | const struct uaudio uaudio_oss = { | |
182 | .name = "oss", | |
183 | .options = oss_options, | |
184 | .start = oss_start, | |
185 | .stop = oss_stop, | |
186 | .activate = oss_activate, | |
187 | .deactivate = oss_deactivate | |
188 | }; | |
189 | ||
190 | #endif | |
191 | ||
192 | /* | |
193 | Local Variables: | |
194 | c-basic-offset:2 | |
195 | comment-column:40 | |
196 | fill-column:79 | |
197 | indent-tabs-mode:nil | |
198 | End: | |
199 | */ |