annotate src/audio/esd/SDL_esdaudio.c @ 1361:19418e4422cb

New configure-based build system. Still work in progress, but much improved
author Sam Lantinga <slouken@libsdl.org>
date Thu, 16 Feb 2006 10:11:48 +0000
parents c71e05b4dc2e
children e440d5c488c1
rev   line source
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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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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22
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23 /* Allow access to an ESD network stream mixing buffer */
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24
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25 #ifdef ESD_SUPPORT
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26
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27 #include <errno.h>
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28
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29 #include <esd.h>
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30
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31 #include "SDL_timer.h"
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32 #include "SDL_audio.h"
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33 #include "../SDL_audiomem.h"
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34 #include "../SDL_audio_c.h"
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35 #include "../SDL_audiodev_c.h"
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36 #include "SDL_esdaudio.h"
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37
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38 #ifdef SDL_AUDIO_DRIVER_ESD_DYNAMIC
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39 #include "SDL_name.h"
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40 #include "SDL_loadso.h"
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41 #else
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42 #define SDL_NAME(X) X
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43 #endif
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44
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45 /* The tag name used by ESD audio */
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46 #define ESD_DRIVER_NAME "esd"
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47
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48 /* Audio driver functions */
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49 static int ESD_OpenAudio(_THIS, SDL_AudioSpec *spec);
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50 static void ESD_WaitAudio(_THIS);
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51 static void ESD_PlayAudio(_THIS);
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52 static Uint8 *ESD_GetAudioBuf(_THIS);
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53 static void ESD_CloseAudio(_THIS);
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54
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55 #ifdef SDL_AUDIO_DRIVER_ESD_DYNAMIC
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56
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57 static const char *esd_library = SDL_AUDIO_DRIVER_ESD_DYNAMIC;
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58 static void *esd_handle = NULL;
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59 static int esd_loaded = 0;
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60
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61 static int (*SDL_NAME(esd_open_sound))( const char *host );
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62 static int (*SDL_NAME(esd_close))( int esd );
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63 static int (*SDL_NAME(esd_play_stream))( esd_format_t format, int rate,
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64 const char *host, const char *name );
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65 static struct {
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66 const char *name;
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67 void **func;
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68 } esd_functions[] = {
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69 { "esd_open_sound", (void **)&SDL_NAME(esd_open_sound) },
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70 { "esd_close", (void **)&SDL_NAME(esd_close) },
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71 { "esd_play_stream", (void **)&SDL_NAME(esd_play_stream) },
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72 };
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73
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74 static void UnloadESDLibrary()
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75 {
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76 if ( esd_loaded ) {
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77 SDL_UnloadObject(esd_handle);
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78 esd_handle = NULL;
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79 esd_loaded = 0;
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80 }
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81 }
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82
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83 static int LoadESDLibrary(void)
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84 {
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85 int i, retval = -1;
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86
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87 esd_handle = SDL_LoadObject(esd_library);
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88 if ( esd_handle ) {
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89 esd_loaded = 1;
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90 retval = 0;
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91 for ( i=0; i<SDL_TABLESIZE(esd_functions); ++i ) {
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92 *esd_functions[i].func = SDL_LoadFunction(esd_handle, esd_functions[i].name);
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93 if ( !*esd_functions[i].func ) {
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94 retval = -1;
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95 UnloadESDLibrary();
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96 break;
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97 }
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98 }
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99 }
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100 return retval;
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101 }
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102
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103 #else
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104
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105 static void UnloadESDLibrary()
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106 {
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107 return;
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108 }
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109
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110 static int LoadESDLibrary(void)
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111 {
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112 return 0;
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113 }
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114
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115 #endif /* SDL_AUDIO_DRIVER_ESD_DYNAMIC */
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116
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117 /* Audio driver bootstrap functions */
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118
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119 static int Audio_Available(void)
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120 {
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121 int connection;
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122 int available;
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123
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124 available = 0;
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125 if ( LoadESDLibrary() < 0 ) {
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126 return available;
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127 }
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128 connection = SDL_NAME(esd_open_sound)(NULL);
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129 if ( connection >= 0 ) {
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130 available = 1;
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131 SDL_NAME(esd_close)(connection);
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132 }
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133 UnloadESDLibrary();
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134 return(available);
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135 }
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136
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137 static void Audio_DeleteDevice(SDL_AudioDevice *device)
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138 {
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139 SDL_free(device->hidden);
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140 SDL_free(device);
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141 UnloadESDLibrary();
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142 }
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143
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144 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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145 {
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146 SDL_AudioDevice *this;
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147
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148 /* Initialize all variables that we clean on shutdown */
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149 LoadESDLibrary();
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150 this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice));
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151 if ( this ) {
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152 SDL_memset(this, 0, (sizeof *this));
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153 this->hidden = (struct SDL_PrivateAudioData *)
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154 SDL_malloc((sizeof *this->hidden));
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155 }
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156 if ( (this == NULL) || (this->hidden == NULL) ) {
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157 SDL_OutOfMemory();
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158 if ( this ) {
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159 SDL_free(this);
0
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160 }
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161 return(0);
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162 }
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163 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
0
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164 audio_fd = -1;
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165
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166 /* Set the function pointers */
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167 this->OpenAudio = ESD_OpenAudio;
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168 this->WaitAudio = ESD_WaitAudio;
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169 this->PlayAudio = ESD_PlayAudio;
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170 this->GetAudioBuf = ESD_GetAudioBuf;
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171 this->CloseAudio = ESD_CloseAudio;
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172
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173 this->free = Audio_DeleteDevice;
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174
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175 return this;
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176 }
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177
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178 AudioBootStrap ESD_bootstrap = {
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179 ESD_DRIVER_NAME, "Enlightened Sound Daemon",
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180 Audio_Available, Audio_CreateDevice
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181 };
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182
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183 /* This function waits until it is possible to write a full sound buffer */
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184 static void ESD_WaitAudio(_THIS)
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185 {
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186 Sint32 ticks;
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187
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188 /* Check to see if the thread-parent process is still alive */
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189 { static int cnt = 0;
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190 /* Note that this only works with thread implementations
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191 that use a different process id for each thread.
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192 */
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193 if (parent && (((++cnt)%10) == 0)) { /* Check every 10 loops */
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194 if ( kill(parent, 0) < 0 ) {
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195 this->enabled = 0;
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196 }
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197 }
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198 }
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199
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200 /* Use timer for general audio synchronization */
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201 ticks = ((Sint32)(next_frame - SDL_GetTicks()))-FUDGE_TICKS;
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202 if ( ticks > 0 ) {
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203 SDL_Delay(ticks);
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204 }
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205 }
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206
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207 static void ESD_PlayAudio(_THIS)
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208 {
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209 int written;
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210
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211 /* Write the audio data, checking for EAGAIN on broken audio drivers */
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212 do {
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213 written = write(audio_fd, mixbuf, mixlen);
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214 if ( (written < 0) && ((errno == 0) || (errno == EAGAIN)) ) {
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215 SDL_Delay(1); /* Let a little CPU time go by */
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216 }
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217 } while ( (written < 0) &&
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218 ((errno == 0) || (errno == EAGAIN) || (errno == EINTR)) );
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219
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220 /* Set the next write frame */
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221 next_frame += frame_ticks;
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222
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223 /* If we couldn't write, assume fatal error for now */
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224 if ( written < 0 ) {
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225 this->enabled = 0;
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226 }
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227 }
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228
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229 static Uint8 *ESD_GetAudioBuf(_THIS)
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230 {
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231 return(mixbuf);
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232 }
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233
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234 static void ESD_CloseAudio(_THIS)
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235 {
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236 if ( mixbuf != NULL ) {
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237 SDL_FreeAudioMem(mixbuf);
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238 mixbuf = NULL;
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239 }
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240 if ( audio_fd >= 0 ) {
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241 SDL_NAME(esd_close)(audio_fd);
0
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242 audio_fd = -1;
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243 }
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244 }
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245
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246 /* Try to get the name of the program */
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247 static char *get_progname(void)
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248 {
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249 char *progname = NULL;
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250 #ifdef linux
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251 FILE *fp;
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252 static char temp[BUFSIZ];
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253
1338
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254 SDL_snprintf(temp, SDL_arraysize(temp), "/proc/%d/cmdline", getpid());
0
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255 fp = fopen(temp, "r");
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256 if ( fp != NULL ) {
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257 if ( fgets(temp, sizeof(temp)-1, fp) ) {
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258 progname = SDL_strrchr(temp, '/');
0
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259 if ( progname == NULL ) {
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260 progname = temp;
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261 } else {
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262 progname = progname+1;
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263 }
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264 }
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265 fclose(fp);
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266 }
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267 #endif
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268 return(progname);
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269 }
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270
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271 static int ESD_OpenAudio(_THIS, SDL_AudioSpec *spec)
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272 {
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273 esd_format_t format;
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diff changeset
274
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275 /* Convert audio spec to the ESD audio format */
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276 format = (ESD_STREAM | ESD_PLAY);
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diff changeset
277 switch ( spec->format & 0xFF ) {
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diff changeset
278 case 8:
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279 format |= ESD_BITS8;
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diff changeset
280 break;
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281 case 16:
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diff changeset
282 format |= ESD_BITS16;
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diff changeset
283 break;
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diff changeset
284 default:
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285 SDL_SetError("Unsupported ESD audio format");
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286 return(-1);
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diff changeset
287 }
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diff changeset
288 if ( spec->channels == 1 ) {
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diff changeset
289 format |= ESD_MONO;
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diff changeset
290 } else {
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291 format |= ESD_STEREO;
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diff changeset
292 }
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diff changeset
293 #if 0
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294 spec->samples = ESD_BUF_SIZE; /* Darn, no way to change this yet */
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295 #endif
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296
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297 /* Open a connection to the ESD audio server */
294
d2d48e10f370 Added a new header file: SDL_loadso.h
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parents: 252
diff changeset
298 audio_fd = SDL_NAME(esd_play_stream)(format, spec->freq, NULL, get_progname());
0
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diff changeset
299 if ( audio_fd < 0 ) {
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diff changeset
300 SDL_SetError("Couldn't open ESD connection");
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diff changeset
301 return(-1);
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diff changeset
302 }
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diff changeset
303
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diff changeset
304 /* Calculate the final parameters for this audio specification */
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diff changeset
305 SDL_CalculateAudioSpec(spec);
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diff changeset
306 frame_ticks = (float)(spec->samples*1000)/spec->freq;
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307 next_frame = SDL_GetTicks()+frame_ticks;
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diff changeset
308
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diff changeset
309 /* Allocate mixing buffer */
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parents:
diff changeset
310 mixlen = spec->size;
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diff changeset
311 mixbuf = (Uint8 *)SDL_AllocAudioMem(mixlen);
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diff changeset
312 if ( mixbuf == NULL ) {
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diff changeset
313 return(-1);
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diff changeset
314 }
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
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parents: 1312
diff changeset
315 SDL_memset(mixbuf, spec->silence, spec->size);
0
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parents:
diff changeset
316
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diff changeset
317 /* Get the parent process id (we're the parent of the audio thread) */
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318 parent = getpid();
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319
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320 /* We're ready to rock and roll. :-) */
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321 return(0);
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322 }
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323
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324 #endif /* ESD_SUPPORT */