1 /*
2 SDL - Simple DirectMedia Layer
3 Copyright (C) 1997-2009 Sam Lantinga
4
5 This library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 This library 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 GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with this library; if not, write to the Free Software
17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18
19 Sam Lantinga
20 slouken@libsdl.org
21 */
22 #include "SDL_config.h"
23
24 /* Get the name of the audio device we use for output */
25
26 #if SDL_AUDIO_DRIVER_BSD || SDL_AUDIO_DRIVER_OSS || SDL_AUDIO_DRIVER_SUNAUDIO
27
28 #include <fcntl.h>
29 #include <sys/types.h>
30 #include <sys/stat.h>
31
32 #include "SDL_stdinc.h"
33 #include "SDL_audiodev_c.h"
34
35 #ifndef _PATH_DEV_DSP
36 #if defined(__NETBSD__) || defined(__OPENBSD__)
37 #define _PATH_DEV_DSP "/dev/audio"
38 #else
39 #define _PATH_DEV_DSP "/dev/dsp"
40 #endif
41 #endif
42 #ifndef _PATH_DEV_DSP24
43 #define _PATH_DEV_DSP24 "/dev/sound/dsp"
44 #endif
45 #ifndef _PATH_DEV_AUDIO
46 #define _PATH_DEV_AUDIO "/dev/audio"
47 #endif
48
49
SDL_OpenAudioPath(char * path,int maxlen,int flags,int classic)50 int SDL_OpenAudioPath(char *path, int maxlen, int flags, int classic)
51 {
52 const char *audiodev;
53 int audio_fd;
54 char audiopath[1024];
55
56 /* Figure out what our audio device is */
57 if ( ((audiodev=SDL_getenv("SDL_PATH_DSP")) == NULL) &&
58 ((audiodev=SDL_getenv("AUDIODEV")) == NULL) ) {
59 if ( classic ) {
60 audiodev = _PATH_DEV_AUDIO;
61 } else {
62 struct stat sb;
63
64 /* Added support for /dev/sound/\* in Linux 2.4 */
65 if ( ((stat("/dev/sound", &sb) == 0) && S_ISDIR(sb.st_mode)) &&
66 ((stat(_PATH_DEV_DSP24, &sb) == 0) && S_ISCHR(sb.st_mode)) ) {
67 audiodev = _PATH_DEV_DSP24;
68 } else {
69 audiodev = _PATH_DEV_DSP;
70 }
71 }
72 }
73 audio_fd = open(audiodev, flags, 0);
74
75 /* If the first open fails, look for other devices */
76 if ( (audio_fd < 0) && (SDL_strlen(audiodev) < (sizeof(audiopath)-3)) ) {
77 int exists, instance;
78 struct stat sb;
79
80 instance = 1;
81 do { /* Don't use errno ENOENT - it may not be thread-safe */
82 SDL_snprintf(audiopath, SDL_arraysize(audiopath),
83 "%s%d", audiodev, instance++);
84 exists = 0;
85 if ( stat(audiopath, &sb) == 0 ) {
86 exists = 1;
87 audio_fd = open(audiopath, flags, 0);
88 }
89 } while ( exists && (audio_fd < 0) );
90 audiodev = audiopath;
91 }
92 if ( path != NULL ) {
93 SDL_strlcpy(path, audiodev, maxlen);
94 path[maxlen-1] = '\0';
95 }
96 return(audio_fd);
97 }
98
99 #elif SDL_AUDIO_DRIVER_PAUD
100
101 /* Get the name of the audio device we use for output */
102
103 #include <sys/types.h>
104 #include <sys/stat.h>
105
106 #include "SDL_stdinc.h"
107 #include "SDL_audiodev_c.h"
108
109 #ifndef _PATH_DEV_DSP
110 #define _PATH_DEV_DSP "/dev/%caud%c/%c"
111 #endif
112
113 char devsettings[][3] =
114 {
115 { 'p', '0', '1' }, { 'p', '0', '2' }, { 'p', '0', '3' }, { 'p', '0', '4' },
116 { 'p', '1', '1' }, { 'p', '1', '2' }, { 'p', '1', '3' }, { 'p', '1', '4' },
117 { 'p', '2', '1' }, { 'p', '2', '2' }, { 'p', '2', '3' }, { 'p', '2', '4' },
118 { 'p', '3', '1' }, { 'p', '3', '2' }, { 'p', '3', '3' }, { 'p', '3', '4' },
119 { 'b', '0', '1' }, { 'b', '0', '2' }, { 'b', '0', '3' }, { 'b', '0', '4' },
120 { 'b', '1', '1' }, { 'b', '1', '2' }, { 'b', '1', '3' }, { 'b', '1', '4' },
121 { 'b', '2', '1' }, { 'b', '2', '2' }, { 'b', '2', '3' }, { 'b', '2', '4' },
122 { 'b', '3', '1' }, { 'b', '3', '2' }, { 'b', '3', '3' }, { 'b', '3', '4' },
123 { '\0', '\0', '\0' }
124 };
125
OpenUserDefinedDevice(char * path,int maxlen,int flags)126 static int OpenUserDefinedDevice(char *path, int maxlen, int flags)
127 {
128 const char *audiodev;
129 int audio_fd;
130
131 /* Figure out what our audio device is */
132 if ((audiodev=SDL_getenv("SDL_PATH_DSP")) == NULL) {
133 audiodev=SDL_getenv("AUDIODEV");
134 }
135 if ( audiodev == NULL ) {
136 return -1;
137 }
138 audio_fd = open(audiodev, flags, 0);
139 if ( path != NULL ) {
140 SDL_strlcpy(path, audiodev, maxlen);
141 path[maxlen-1] = '\0';
142 }
143 return audio_fd;
144 }
145
SDL_OpenAudioPath(char * path,int maxlen,int flags,int classic)146 int SDL_OpenAudioPath(char *path, int maxlen, int flags, int classic)
147 {
148 struct stat sb;
149 int audio_fd;
150 char audiopath[1024];
151 int cycle;
152
153 audio_fd = OpenUserDefinedDevice(path,maxlen,flags);
154 if ( audio_fd != -1 ) {
155 return audio_fd;
156 }
157
158 cycle = 0;
159 while( devsettings[cycle][0] != '\0' ) {
160 SDL_snprintf( audiopath, SDL_arraysize(audiopath),
161 _PATH_DEV_DSP,
162 devsettings[cycle][0],
163 devsettings[cycle][1],
164 devsettings[cycle][2]);
165
166 if ( stat(audiopath, &sb) == 0 ) {
167 audio_fd = open(audiopath, flags, 0);
168 if ( audio_fd > 0 ) {
169 if ( path != NULL ) {
170 SDL_strlcpy( path, audiopath, maxlen );
171 }
172 return audio_fd;
173 }
174 }
175 }
176 return -1;
177 }
178
179 #endif /* Audio driver selection */
180