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annotate src/audio/SDL_audiodev.c @ 1662:782fd950bd46 SDL-1.3

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Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API. WARNING: None of the video drivers have been updated for the new API yet! The API is still under design and very fluid. The code is now run through a consistent indent format: indent -i4 -nut -nsc -br -ce The headers are being converted to automatically generate doxygen documentation.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 28 May 2006 13:04:16 +0000
parents 12b6d331d82a
children 4da1ee79c9af
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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14
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15 You should have received a copy of the GNU Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23
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24 /* Get the name of the audio device we use for output */
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25
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26 #if SDL_AUDIO_DRIVER_BSD || SDL_AUDIO_DRIVER_OSS || SDL_AUDIO_DRIVER_SUNAUDIO
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27
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28 #include <fcntl.h>
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29 #include <sys/types.h>
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30 #include <sys/stat.h>
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31
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32 #include "SDL_stdinc.h"
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33 #include "SDL_audiodev_c.h"
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34
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35 #ifndef _PATH_DEV_DSP
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36 #if defined(__NETBSD__) || defined(__OPENBSD__)
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37 #define _PATH_DEV_DSP "/dev/audio"
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38 #else
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39 #define _PATH_DEV_DSP "/dev/dsp"
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40 #endif
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41 #endif
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42 #ifndef _PATH_DEV_DSP24
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43 #define _PATH_DEV_DSP24 "/dev/sound/dsp"
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44 #endif
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45 #ifndef _PATH_DEV_AUDIO
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46 #define _PATH_DEV_AUDIO "/dev/audio"
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47 #endif
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48
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49
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50 int
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51 SDL_OpenAudioPath (char *path, int maxlen, int flags, int classic)
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52 {
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53 const char *audiodev;
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54 int audio_fd;
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55 char audiopath[1024];
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56
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57 /* Figure out what our audio device is */
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58 if (((audiodev = SDL_getenv ("SDL_PATH_DSP")) == NULL) &&
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59 ((audiodev = SDL_getenv ("AUDIODEV")) == NULL)) {
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60 if (classic) {
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61 audiodev = _PATH_DEV_AUDIO;
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62 } else {
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63 struct stat sb;
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64
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65 /* Added support for /dev/sound/\* in Linux 2.4 */
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66 if (((stat ("/dev/sound", &sb) == 0) && S_ISDIR (sb.st_mode))
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67 && ((stat (_PATH_DEV_DSP24, &sb) == 0)
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68 && S_ISCHR (sb.st_mode))) {
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69 audiodev = _PATH_DEV_DSP24;
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70 } else {
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71 audiodev = _PATH_DEV_DSP;
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72 }
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73 }
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74 }
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75 audio_fd = open (audiodev, flags, 0);
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76
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77 /* If the first open fails, look for other devices */
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78 if ((audio_fd < 0) && (SDL_strlen (audiodev) < (sizeof (audiopath) - 3))) {
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79 int exists, instance;
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80 struct stat sb;
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81
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82 instance = 1;
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83 do { /* Don't use errno ENOENT - it may not be thread-safe */
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84 SDL_snprintf (audiopath, SDL_arraysize (audiopath),
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85 "%s%d", audiodev, instance++);
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86 exists = 0;
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87 if (stat (audiopath, &sb) == 0) {
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88 exists = 1;
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89 audio_fd = open (audiopath, flags, 0);
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90 }
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91 }
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92 while (exists && (audio_fd < 0));
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93 audiodev = audiopath;
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94 }
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95 if (path != NULL) {
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96 SDL_strlcpy (path, audiodev, maxlen);
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97 path[maxlen - 1] = '\0';
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98 }
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99 return (audio_fd);
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100 }
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101
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102 #elif SDL_AUDIO_DRIVER_PAUD
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103
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104 /* Get the name of the audio device we use for output */
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105
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106 #include <sys/types.h>
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107 #include <sys/stat.h>
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108
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109 #include "SDL_stdinc.h"
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110 #include "SDL_audiodev_c.h"
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111
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112 #ifndef _PATH_DEV_DSP
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113 #define _PATH_DEV_DSP "/dev/%caud%c/%c"
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114 #endif
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115
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116 char devsettings[][3] = {
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117 {'p', '0', '1'}, {'p', '0', '2'}, {'p', '0', '3'}, {'p', '0', '4'},
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118 {'p', '1', '1'}, {'p', '1', '2'}, {'p', '1', '3'}, {'p', '1', '4'},
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119 {'p', '2', '1'}, {'p', '2', '2'}, {'p', '2', '3'}, {'p', '2', '4'},
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120 {'p', '3', '1'}, {'p', '3', '2'}, {'p', '3', '3'}, {'p', '3', '4'},
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121 {'b', '0', '1'}, {'b', '0', '2'}, {'b', '0', '3'}, {'b', '0', '4'},
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122 {'b', '1', '1'}, {'b', '1', '2'}, {'b', '1', '3'}, {'b', '1', '4'},
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123 {'b', '2', '1'}, {'b', '2', '2'}, {'b', '2', '3'}, {'b', '2', '4'},
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124 {'b', '3', '1'}, {'b', '3', '2'}, {'b', '3', '3'}, {'b', '3', '4'},
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125 {'\0', '\0', '\0'}
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126 };
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127
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128 static int
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129 OpenUserDefinedDevice (char *path, int maxlen, int flags)
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130 {
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131 const char *audiodev;
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132 int audio_fd;
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133
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134 /* Figure out what our audio device is */
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135 if ((audiodev = SDL_getenv ("SDL_PATH_DSP")) == NULL) {
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136 audiodev = SDL_getenv ("AUDIODEV");
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137 }
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138 if (audiodev == NULL) {
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139 return -1;
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140 }
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141 audio_fd = open (audiodev, flags, 0);
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142 if (path != NULL) {
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143 SDL_strlcpy (path, audiodev, maxlen);
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144 path[maxlen - 1] = '\0';
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145 }
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146 return audio_fd;
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147 }
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148
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149 int
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150 SDL_OpenAudioPath (char *path, int maxlen, int flags, int classic)
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151 {
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152 struct stat sb;
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153 int audio_fd;
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154 char audiopath[1024];
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155 int cycle;
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156
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157 audio_fd = OpenUserDefinedDevice (path, maxlen, flags);
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158 if (audio_fd != -1) {
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159 return audio_fd;
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160 }
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161
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162 cycle = 0;
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163 while (devsettings[cycle][0] != '\0') {
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164 SDL_snprintf (audiopath, SDL_arraysize (audiopath),
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165 _PATH_DEV_DSP,
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166 devsettings[cycle][0],
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167 devsettings[cycle][1], devsettings[cycle][2]);
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168
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169 if (stat (audiopath, &sb) == 0) {
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170 audio_fd = open (audiopath, flags, 0);
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171 if (audio_fd > 0) {
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172 if (path != NULL) {
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173 SDL_strlcpy (path, audiopath, maxlen);
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174 }
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175 return audio_fd;
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176 }
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177 }
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178 }
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179 return -1;
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180 }
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181
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182 #endif /* Audio driver selection */
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183 /* vi: set ts=4 sw=4 expandtab: */