1 /* 2 SDL - Simple DirectMedia Layer 3 Copyright (C) 1997-2012 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 (at) 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 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 }; 125 126 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 } 145 146 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
