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annotate src/audio/esd/SDL_esdaudio.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 9f836cec0521
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 /* 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 {
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68 const char *name;
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69 void **func;
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70 } esd_functions[] = {
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71 {
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72 "esd_open_sound", (void **) &SDL_NAME (esd_open_sound)}, {
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73 "esd_close", (void **) &SDL_NAME (esd_close)}, {
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74 "esd_play_stream", (void **) &SDL_NAME (esd_play_stream)},};
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75
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76 static void
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77 UnloadESDLibrary ()
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78 {
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79 if (esd_loaded) {
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80 SDL_UnloadObject (esd_handle);
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81 esd_handle = NULL;
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82 esd_loaded = 0;
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83 }
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84 }
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85
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86 static int
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87 LoadESDLibrary (void)
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88 {
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89 int i, retval = -1;
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90
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91 esd_handle = SDL_LoadObject (esd_library);
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92 if (esd_handle) {
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93 esd_loaded = 1;
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94 retval = 0;
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95 for (i = 0; i < SDL_arraysize (esd_functions); ++i) {
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96 *esd_functions[i].func =
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97 SDL_LoadFunction (esd_handle, esd_functions[i].name);
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98 if (!*esd_functions[i].func) {
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99 retval = -1;
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100 UnloadESDLibrary ();
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101 break;
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102 }
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103 }
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104 }
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105 return retval;
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106 }
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107
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108 #else
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109
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110 static void
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111 UnloadESDLibrary ()
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112 {
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113 return;
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114 }
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115
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116 static int
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117 LoadESDLibrary (void)
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118 {
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119 return 0;
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120 }
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121
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122 #endif /* SDL_AUDIO_DRIVER_ESD_DYNAMIC */
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123
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124 /* Audio driver bootstrap functions */
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125
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126 static int
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127 Audio_Available (void)
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128 {
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129 int connection;
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130 int available;
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131
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132 available = 0;
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133 if (LoadESDLibrary () < 0) {
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134 return available;
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135 }
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136 connection = SDL_NAME (esd_open_sound) (NULL);
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137 if (connection >= 0) {
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138 available = 1;
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139 SDL_NAME (esd_close) (connection);
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140 }
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141 UnloadESDLibrary ();
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142 return (available);
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143 }
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144
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145 static void
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146 Audio_DeleteDevice (SDL_AudioDevice * device)
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147 {
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148 SDL_free (device->hidden);
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149 SDL_free (device);
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150 UnloadESDLibrary ();
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151 }
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152
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153 static SDL_AudioDevice *
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154 Audio_CreateDevice (int devindex)
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155 {
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156 SDL_AudioDevice *this;
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157
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158 /* Initialize all variables that we clean on shutdown */
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159 LoadESDLibrary ();
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160 this = (SDL_AudioDevice *) SDL_malloc (sizeof (SDL_AudioDevice));
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161 if (this) {
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162 SDL_memset (this, 0, (sizeof *this));
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163 this->hidden = (struct SDL_PrivateAudioData *)
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164 SDL_malloc ((sizeof *this->hidden));
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165 }
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166 if ((this == NULL) || (this->hidden == NULL)) {
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167 SDL_OutOfMemory ();
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168 if (this) {
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169 SDL_free (this);
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170 }
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171 return (0);
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172 }
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173 SDL_memset (this->hidden, 0, (sizeof *this->hidden));
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174 audio_fd = -1;
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175
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176 /* Set the function pointers */
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177 this->OpenAudio = ESD_OpenAudio;
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178 this->WaitAudio = ESD_WaitAudio;
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179 this->PlayAudio = ESD_PlayAudio;
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180 this->GetAudioBuf = ESD_GetAudioBuf;
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181 this->CloseAudio = ESD_CloseAudio;
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182
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183 this->free = Audio_DeleteDevice;
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184
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185 return this;
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186 }
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187
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188 AudioBootStrap ESD_bootstrap = {
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189 ESD_DRIVER_NAME, "Enlightened Sound Daemon",
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190 Audio_Available, Audio_CreateDevice
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191 };
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192
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193 /* This function waits until it is possible to write a full sound buffer */
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194 static void
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195 ESD_WaitAudio (_THIS)
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196 {
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197 Sint32 ticks;
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198
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199 /* Check to see if the thread-parent process is still alive */
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200 {
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201 static int cnt = 0;
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202 /* Note that this only works with thread implementations
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203 that use a different process id for each thread.
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204 */
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205 if (parent && (((++cnt) % 10) == 0)) { /* Check every 10 loops */
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206 if (kill (parent, 0) < 0) {
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207 this->enabled = 0;
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208 }
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209 }
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210 }
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211
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212 /* Use timer for general audio synchronization */
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213 ticks = ((Sint32) (next_frame - SDL_GetTicks ())) - FUDGE_TICKS;
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214 if (ticks > 0) {
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215 SDL_Delay (ticks);
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216 }
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217 }
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218
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219 static void
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220 ESD_PlayAudio (_THIS)
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221 {
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222 int written;
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223
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224 /* Write the audio data, checking for EAGAIN on broken audio drivers */
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225 do {
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226 written = write (audio_fd, mixbuf, mixlen);
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227 if ((written < 0) && ((errno == 0) || (errno == EAGAIN))) {
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228 SDL_Delay (1); /* Let a little CPU time go by */
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229 }
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230 }
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231 while ((written < 0) &&
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232 ((errno == 0) || (errno == EAGAIN) || (errno == EINTR)));
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233
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234 /* Set the next write frame */
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235 next_frame += frame_ticks;
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236
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237 /* If we couldn't write, assume fatal error for now */
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238 if (written < 0) {
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239 this->enabled = 0;
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240 }
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241 }
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242
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243 static Uint8 *
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244 ESD_GetAudioBuf (_THIS)
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245 {
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246 return (mixbuf);
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247 }
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248
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249 static void
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250 ESD_CloseAudio (_THIS)
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251 {
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252 if (mixbuf != NULL) {
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253 SDL_FreeAudioMem (mixbuf);
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254 mixbuf = NULL;
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255 }
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256 if (audio_fd >= 0) {
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257 SDL_NAME (esd_close) (audio_fd);
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258 audio_fd = -1;
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259 }
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260 }
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261
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262 /* Try to get the name of the program */
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263 static char *
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264 get_progname (void)
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265 {
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266 char *progname = NULL;
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267 #ifdef __LINUX__
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268 FILE *fp;
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269 static char temp[BUFSIZ];
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270
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271 SDL_snprintf (temp, SDL_arraysize (temp), "/proc/%d/cmdline", getpid ());
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272 fp = fopen (temp, "r");
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273 if (fp != NULL) {
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274 if (fgets (temp, sizeof (temp) - 1, fp)) {
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275 progname = SDL_strrchr (temp, '/');
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276 if (progname == NULL) {
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277 progname = temp;
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278 } else {
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279 progname = progname + 1;
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280 }
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281 }
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282 fclose (fp);
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283 }
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284 #endif
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285 return (progname);
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286 }
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287
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288 static int
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289 ESD_OpenAudio (_THIS, SDL_AudioSpec * spec)
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290 {
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291 esd_format_t format;
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292
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293 /* Convert audio spec to the ESD audio format */
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294 format = (ESD_STREAM | ESD_PLAY);
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295 switch (spec->format & 0xFF) {
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296 case 8:
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297 format |= ESD_BITS8;
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298 break;
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299 case 16:
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300 format |= ESD_BITS16;
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301 break;
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302 default:
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303 SDL_SetError ("Unsupported ESD audio format");
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304 return (-1);
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305 }
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306 if (spec->channels == 1) {
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307 format |= ESD_MONO;
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308 } else {
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309 format |= ESD_STEREO;
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310 }
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311 #if 0
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312 spec->samples = ESD_BUF_SIZE; /* Darn, no way to change this yet */
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313 #endif
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314
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315 /* Open a connection to the ESD audio server */
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316 audio_fd =
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317 SDL_NAME (esd_play_stream) (format, spec->freq, NULL,
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318 get_progname ());
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319 if (audio_fd < 0) {
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320 SDL_SetError ("Couldn't open ESD connection");
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321 return (-1);
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322 }
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323
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324 /* Calculate the final parameters for this audio specification */
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325 SDL_CalculateAudioSpec (spec);
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326 frame_ticks = (float) (spec->samples * 1000) / spec->freq;
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327 next_frame = SDL_GetTicks () + frame_ticks;
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328
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329 /* Allocate mixing buffer */
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330 mixlen = spec->size;
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331 mixbuf = (Uint8 *) SDL_AllocAudioMem (mixlen);
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332 if (mixbuf == NULL) {
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333 return (-1);
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334 }
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335 SDL_memset (mixbuf, spec->silence, spec->size);
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336
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337 /* Get the parent process id (we're the parent of the audio thread) */
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338 parent = getpid ();
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339
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340 /* We're ready to rock and roll. :-) */
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341 return (0);
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342 }
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343
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344 /* vi: set ts=4 sw=4 expandtab: */