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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 /* Allow access to an ESD network stream mixing buffer */ |
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25 |
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26 #include <sys/types.h> |
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27 #include <unistd.h> |
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28 #include <signal.h> |
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29 #include <errno.h> |
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30 #include <esd.h> |
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31 |
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32 #include "SDL_timer.h" |
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33 #include "SDL_audio.h" |
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34 #include "../SDL_audiomem.h" |
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35 #include "../SDL_audio_c.h" |
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36 #include "../SDL_audiodev_c.h" |
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37 #include "SDL_esdaudio.h" |
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38 |
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39 #ifdef SDL_AUDIO_DRIVER_ESD_DYNAMIC |
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40 #include "SDL_name.h" |
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41 #include "SDL_loadso.h" |
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42 #else |
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43 #define SDL_NAME(X) X |
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44 #endif |
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45 |
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46 /* The tag name used by ESD audio */ |
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47 #define ESD_DRIVER_NAME "esd" |
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48 |
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49 /* Audio driver functions */ |
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50 static int ESD_OpenAudio(_THIS, SDL_AudioSpec *spec); |
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51 static void ESD_WaitAudio(_THIS); |
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52 static void ESD_PlayAudio(_THIS); |
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53 static Uint8 *ESD_GetAudioBuf(_THIS); |
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54 static void ESD_CloseAudio(_THIS); |
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55 |
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56 #ifdef SDL_AUDIO_DRIVER_ESD_DYNAMIC |
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57 |
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58 static const char *esd_library = SDL_AUDIO_DRIVER_ESD_DYNAMIC; |
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59 static void *esd_handle = NULL; |
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60 static int esd_loaded = 0; |
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61 |
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62 static int (*SDL_NAME(esd_open_sound))( const char *host ); |
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63 static int (*SDL_NAME(esd_close))( int esd ); |
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64 static int (*SDL_NAME(esd_play_stream))( esd_format_t format, int rate, |
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65 const char *host, const char *name ); |
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66 static struct { |
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67 const char *name; |
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68 void **func; |
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69 } esd_functions[] = { |
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70 { "esd_open_sound", (void **)&SDL_NAME(esd_open_sound) }, |
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71 { "esd_close", (void **)&SDL_NAME(esd_close) }, |
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72 { "esd_play_stream", (void **)&SDL_NAME(esd_play_stream) }, |
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73 }; |
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74 |
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75 static void UnloadESDLibrary() |
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76 { |
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77 if ( esd_loaded ) { |
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78 SDL_UnloadObject(esd_handle); |
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79 esd_handle = NULL; |
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80 esd_loaded = 0; |
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81 } |
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82 } |
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83 |
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84 static int LoadESDLibrary(void) |
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85 { |
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86 int i, retval = -1; |
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87 |
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88 esd_handle = SDL_LoadObject(esd_library); |
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89 if ( esd_handle ) { |
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90 esd_loaded = 1; |
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91 retval = 0; |
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92 for ( i=0; i<SDL_arraysize(esd_functions); ++i ) { |
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93 *esd_functions[i].func = SDL_LoadFunction(esd_handle, esd_functions[i].name); |
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94 if ( !*esd_functions[i].func ) { |
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95 retval = -1; |
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96 UnloadESDLibrary(); |
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97 break; |
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98 } |
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99 } |
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100 } |
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101 return retval; |
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102 } |
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103 |
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104 #else |
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105 |
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106 static void UnloadESDLibrary() |
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107 { |
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108 return; |
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109 } |
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110 |
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111 static int LoadESDLibrary(void) |
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112 { |
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113 return 0; |
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114 } |
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115 |
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116 #endif /* SDL_AUDIO_DRIVER_ESD_DYNAMIC */ |
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117 |
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118 /* Audio driver bootstrap functions */ |
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119 |
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120 static int Audio_Available(void) |
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121 { |
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122 int connection; |
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123 int available; |
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124 |
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125 available = 0; |
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126 if ( LoadESDLibrary() < 0 ) { |
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127 return available; |
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128 } |
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129 connection = SDL_NAME(esd_open_sound)(NULL); |
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130 if ( connection >= 0 ) { |
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131 available = 1; |
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132 SDL_NAME(esd_close)(connection); |
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133 } |
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134 UnloadESDLibrary(); |
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135 return(available); |
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136 } |
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137 |
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138 static void Audio_DeleteDevice(SDL_AudioDevice *device) |
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139 { |
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140 SDL_free(device->hidden); |
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141 SDL_free(device); |
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142 UnloadESDLibrary(); |
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143 } |
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144 |
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145 static SDL_AudioDevice *Audio_CreateDevice(int devindex) |
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146 { |
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147 SDL_AudioDevice *this; |
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148 |
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149 /* Initialize all variables that we clean on shutdown */ |
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150 LoadESDLibrary(); |
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151 this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice)); |
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152 if ( this ) { |
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153 SDL_memset(this, 0, (sizeof *this)); |
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154 this->hidden = (struct SDL_PrivateAudioData *) |
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155 SDL_malloc((sizeof *this->hidden)); |
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156 } |
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157 if ( (this == NULL) || (this->hidden == NULL) ) { |
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158 SDL_OutOfMemory(); |
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159 if ( this ) { |
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160 SDL_free(this); |
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161 } |
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162 return(0); |
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163 } |
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164 SDL_memset(this->hidden, 0, (sizeof *this->hidden)); |
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165 audio_fd = -1; |
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166 |
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167 /* Set the function pointers */ |
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168 this->OpenAudio = ESD_OpenAudio; |
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169 this->WaitAudio = ESD_WaitAudio; |
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170 this->PlayAudio = ESD_PlayAudio; |
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171 this->GetAudioBuf = ESD_GetAudioBuf; |
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172 this->CloseAudio = ESD_CloseAudio; |
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173 |
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174 this->free = Audio_DeleteDevice; |
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175 |
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176 return this; |
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177 } |
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178 |
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179 AudioBootStrap ESD_bootstrap = { |
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180 ESD_DRIVER_NAME, "Enlightened Sound Daemon", |
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181 Audio_Available, Audio_CreateDevice |
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182 }; |
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183 |
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184 /* This function waits until it is possible to write a full sound buffer */ |
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185 static void ESD_WaitAudio(_THIS) |
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186 { |
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187 Sint32 ticks; |
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188 |
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189 /* Check to see if the thread-parent process is still alive */ |
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190 { static int cnt = 0; |
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191 /* Note that this only works with thread implementations |
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192 that use a different process id for each thread. |
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193 */ |
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194 if (parent && (((++cnt)%10) == 0)) { /* Check every 10 loops */ |
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195 if ( kill(parent, 0) < 0 ) { |
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196 this->enabled = 0; |
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197 } |
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198 } |
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199 } |
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200 |
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201 /* Use timer for general audio synchronization */ |
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202 ticks = ((Sint32)(next_frame - SDL_GetTicks()))-FUDGE_TICKS; |
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203 if ( ticks > 0 ) { |
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204 SDL_Delay(ticks); |
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205 } |
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206 } |
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207 |
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208 static void ESD_PlayAudio(_THIS) |
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209 { |
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210 int written; |
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211 |
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212 /* Write the audio data, checking for EAGAIN on broken audio drivers */ |
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213 do { |
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214 written = write(audio_fd, mixbuf, mixlen); |
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215 if ( (written < 0) && ((errno == 0) || (errno == EAGAIN)) ) { |
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216 SDL_Delay(1); /* Let a little CPU time go by */ |
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217 } |
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218 } while ( (written < 0) && |
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219 ((errno == 0) || (errno == EAGAIN) || (errno == EINTR)) ); |
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220 |
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221 /* Set the next write frame */ |
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222 next_frame += frame_ticks; |
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223 |
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224 /* If we couldn't write, assume fatal error for now */ |
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225 if ( written < 0 ) { |
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226 this->enabled = 0; |
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227 } |
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228 } |
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229 |
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230 static Uint8 *ESD_GetAudioBuf(_THIS) |
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231 { |
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232 return(mixbuf); |
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233 } |
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234 |
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235 static void ESD_CloseAudio(_THIS) |
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236 { |
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237 if ( mixbuf != NULL ) { |
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238 SDL_FreeAudioMem(mixbuf); |
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239 mixbuf = NULL; |
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240 } |
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241 if ( audio_fd >= 0 ) { |
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242 SDL_NAME(esd_close)(audio_fd); |
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243 audio_fd = -1; |
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244 } |
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245 } |
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246 |
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247 /* Try to get the name of the program */ |
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248 static char *get_progname(void) |
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249 { |
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250 char *progname = NULL; |
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251 #ifdef __LINUX__ |
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252 FILE *fp; |
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253 static char temp[BUFSIZ]; |
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254 |
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255 SDL_snprintf(temp, SDL_arraysize(temp), "/proc/%d/cmdline", getpid()); |
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256 fp = fopen(temp, "r"); |
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257 if ( fp != NULL ) { |
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258 if ( fgets(temp, sizeof(temp)-1, fp) ) { |
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259 progname = SDL_strrchr(temp, '/'); |
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260 if ( progname == NULL ) { |
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261 progname = temp; |
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262 } else { |
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263 progname = progname+1; |
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264 } |
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265 } |
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266 fclose(fp); |
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267 } |
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268 #endif |
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269 return(progname); |
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270 } |
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271 |
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272 static int ESD_OpenAudio(_THIS, SDL_AudioSpec *spec) |
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273 { |
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274 esd_format_t format; |
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275 |
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276 /* Convert audio spec to the ESD audio format */ |
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277 format = (ESD_STREAM | ESD_PLAY); |
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278 switch ( spec->format & 0xFF ) { |
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279 case 8: |
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280 format |= ESD_BITS8; |
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281 break; |
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282 case 16: |
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283 format |= ESD_BITS16; |
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284 break; |
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285 default: |
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286 SDL_SetError("Unsupported ESD audio format"); |
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287 return(-1); |
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288 } |
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289 if ( spec->channels == 1 ) { |
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290 format |= ESD_MONO; |
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291 } else { |
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292 format |= ESD_STEREO; |
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293 } |
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294 #if 0 |
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295 spec->samples = ESD_BUF_SIZE; /* Darn, no way to change this yet */ |
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296 #endif |
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297 |
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298 /* Open a connection to the ESD audio server */ |
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299 audio_fd = SDL_NAME(esd_play_stream)(format, spec->freq, NULL, get_progname()); |
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300 if ( audio_fd < 0 ) { |
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301 SDL_SetError("Couldn't open ESD connection"); |
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302 return(-1); |
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303 } |
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304 |
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305 /* Calculate the final parameters for this audio specification */ |
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306 SDL_CalculateAudioSpec(spec); |
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307 frame_ticks = (float)(spec->samples*1000)/spec->freq; |
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308 next_frame = SDL_GetTicks()+frame_ticks; |
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309 |
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310 /* Allocate mixing buffer */ |
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311 mixlen = spec->size; |
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312 mixbuf = (Uint8 *)SDL_AllocAudioMem(mixlen); |
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313 if ( mixbuf == NULL ) { |
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314 return(-1); |
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315 } |
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316 SDL_memset(mixbuf, spec->silence, spec->size); |
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317 |
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318 /* Get the parent process id (we're the parent of the audio thread) */ |
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319 parent = getpid(); |
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320 |
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321 /* We're ready to rock and roll. :-) */ |
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322 return(0); |
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323 } |