annotate src/audio/esd/SDL_esdaudio.c @ 864:0c892e99b65b

Date: Sun, 29 Feb 2004 20:28:27 +0200 From: Martin_Storsj Subject: Slight bug in ESD and aRts When I experimented with the ALSA-patch, I found a slight bug in the Load{ESD,ARTS}Library-functions. The check of whether a function pointer was correctly loaded looks like this right now: *esd_functions[i].func = SDL_LoadFunction(esd_handle, esd_functions[i].name); if ( ! esd_functions[i].func ) Isn't that supposed to be ( ! *esd_functions[i].func )?
author Sam Lantinga <slouken@libsdl.org>
date Tue, 02 Mar 2004 12:45:22 +0000
parents b8d311d90021
children c9b51268668f
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2004 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 Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 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 Library 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 Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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
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23 #ifdef SAVE_RCSID
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24 static char rcsid =
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25 "@(#) $Id$";
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26 #endif
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27
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28 /* Allow access to an ESD network stream mixing buffer */
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29
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30 #ifdef ESD_SUPPORT
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31
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32 #include <stdlib.h>
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33 #include <stdio.h>
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34 #include <string.h>
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35 #include <errno.h>
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36 #include <signal.h>
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37 #include <unistd.h>
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38
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39 #include <esd.h>
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40
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41 #include "SDL_audio.h"
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42 #include "SDL_error.h"
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43 #include "SDL_audiomem.h"
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44 #include "SDL_audio_c.h"
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45 #include "SDL_timer.h"
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46 #include "SDL_audiodev_c.h"
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47 #include "SDL_esdaudio.h"
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48
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49 #ifdef ESD_DYNAMIC
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50 #include "SDL_name.h"
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51 #include "SDL_loadso.h"
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52 #else
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53 #define SDL_NAME(X) X
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54 #endif
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55
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56 /* The tag name used by ESD audio */
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57 #define ESD_DRIVER_NAME "esd"
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58
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59 /* Audio driver functions */
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60 static int ESD_OpenAudio(_THIS, SDL_AudioSpec *spec);
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61 static void ESD_WaitAudio(_THIS);
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62 static void ESD_PlayAudio(_THIS);
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63 static Uint8 *ESD_GetAudioBuf(_THIS);
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64 static void ESD_CloseAudio(_THIS);
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65
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66 #ifdef ESD_DYNAMIC
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67
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68 static const char *esd_library = ESD_DYNAMIC;
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69 static void *esd_handle = NULL;
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70 static int esd_loaded = 0;
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71
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72 static int (*SDL_NAME(esd_open_sound))( const char *host );
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73 static int (*SDL_NAME(esd_close))( int esd );
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74 static int (*SDL_NAME(esd_play_stream))( esd_format_t format, int rate,
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75 const char *host, const char *name );
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76 static struct {
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77 const char *name;
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78 void **func;
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79 } esd_functions[] = {
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80 { "esd_open_sound", (void **)&SDL_NAME(esd_open_sound) },
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81 { "esd_close", (void **)&SDL_NAME(esd_close) },
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82 { "esd_play_stream", (void **)&SDL_NAME(esd_play_stream) },
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83 };
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84
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85 static void UnloadESDLibrary()
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86 {
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87 if ( esd_loaded ) {
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88 SDL_UnloadObject(esd_handle);
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89 esd_handle = NULL;
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90 esd_loaded = 0;
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91 }
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92 }
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93
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94 static int LoadESDLibrary(void)
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95 {
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96 int i, retval = -1;
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97
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98 esd_handle = SDL_LoadObject(esd_library);
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99 if ( esd_handle ) {
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100 esd_loaded = 1;
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101 retval = 0;
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102 for ( i=0; i<SDL_TABLESIZE(esd_functions); ++i ) {
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103 *esd_functions[i].func = SDL_LoadFunction(esd_handle, esd_functions[i].name);
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104 if ( !*esd_functions[i].func ) {
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105 retval = -1;
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106 UnloadESDLibrary();
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107 break;
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108 }
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109 }
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110 }
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111 return retval;
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112 }
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113
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114 #else
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115
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116 static void UnloadESDLibrary()
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117 {
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118 return;
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119 }
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120
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121 static int LoadESDLibrary(void)
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122 {
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123 return 0;
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124 }
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125
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126 #endif /* ESD_DYNAMIC */
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127
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128 /* Audio driver bootstrap functions */
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129
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130 static int Audio_Available(void)
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131 {
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132 int connection;
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133 int available;
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134
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135 available = 0;
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136 if ( LoadESDLibrary() < 0 ) {
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137 return available;
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138 }
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139 connection = SDL_NAME(esd_open_sound)(NULL);
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140 if ( connection >= 0 ) {
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141 available = 1;
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142 SDL_NAME(esd_close)(connection);
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143 }
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144 UnloadESDLibrary();
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145 return(available);
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146 }
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147
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148 static void Audio_DeleteDevice(SDL_AudioDevice *device)
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149 {
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150 free(device->hidden);
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151 free(device);
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152 UnloadESDLibrary();
0
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153 }
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154
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155 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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156 {
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157 SDL_AudioDevice *this;
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158
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159 /* Initialize all variables that we clean on shutdown */
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160 LoadESDLibrary();
0
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161 this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice));
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162 if ( this ) {
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163 memset(this, 0, (sizeof *this));
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164 this->hidden = (struct SDL_PrivateAudioData *)
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165 malloc((sizeof *this->hidden));
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166 }
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167 if ( (this == NULL) || (this->hidden == NULL) ) {
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168 SDL_OutOfMemory();
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169 if ( this ) {
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170 free(this);
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171 }
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172 return(0);
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173 }
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174 memset(this->hidden, 0, (sizeof *this->hidden));
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175 audio_fd = -1;
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176
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177 /* Set the function pointers */
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178 this->OpenAudio = ESD_OpenAudio;
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179 this->WaitAudio = ESD_WaitAudio;
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180 this->PlayAudio = ESD_PlayAudio;
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181 this->GetAudioBuf = ESD_GetAudioBuf;
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182 this->CloseAudio = ESD_CloseAudio;
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183
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184 this->free = Audio_DeleteDevice;
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185
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186 return this;
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187 }
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188
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189 AudioBootStrap ESD_bootstrap = {
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190 ESD_DRIVER_NAME, "Enlightened Sound Daemon",
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191 Audio_Available, Audio_CreateDevice
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192 };
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193
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194 /* This function waits until it is possible to write a full sound buffer */
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195 static void 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 { static int cnt = 0;
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201 /* Note that this only works with thread implementations
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202 that use a different process id for each thread.
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203 */
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204 if (parent && (((++cnt)%10) == 0)) { /* Check every 10 loops */
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205 if ( kill(parent, 0) < 0 ) {
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206 this->enabled = 0;
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207 }
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208 }
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209 }
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210
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211 /* Use timer for general audio synchronization */
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212 ticks = ((Sint32)(next_frame - SDL_GetTicks()))-FUDGE_TICKS;
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213 if ( ticks > 0 ) {
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214 SDL_Delay(ticks);
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215 }
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216 }
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217
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218 static void ESD_PlayAudio(_THIS)
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219 {
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220 int written;
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221
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222 /* Write the audio data, checking for EAGAIN on broken audio drivers */
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223 do {
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224 written = write(audio_fd, mixbuf, mixlen);
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225 if ( (written < 0) && ((errno == 0) || (errno == EAGAIN)) ) {
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226 SDL_Delay(1); /* Let a little CPU time go by */
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227 }
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228 } while ( (written < 0) &&
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229 ((errno == 0) || (errno == EAGAIN) || (errno == EINTR)) );
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230
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231 /* Set the next write frame */
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232 next_frame += frame_ticks;
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233
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234 /* If we couldn't write, assume fatal error for now */
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235 if ( written < 0 ) {
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236 this->enabled = 0;
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237 }
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238 }
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239
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240 static Uint8 *ESD_GetAudioBuf(_THIS)
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241 {
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242 return(mixbuf);
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243 }
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244
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245 static void ESD_CloseAudio(_THIS)
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246 {
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247 if ( mixbuf != NULL ) {
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248 SDL_FreeAudioMem(mixbuf);
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249 mixbuf = NULL;
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250 }
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251 if ( audio_fd >= 0 ) {
294
d2d48e10f370 Added a new header file: SDL_loadso.h
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parents: 252
diff changeset
252 SDL_NAME(esd_close)(audio_fd);
0
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253 audio_fd = -1;
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diff changeset
254 }
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255 }
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diff changeset
256
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diff changeset
257 /* Try to get the name of the program */
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diff changeset
258 static char *get_progname(void)
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diff changeset
259 {
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diff changeset
260 char *progname = NULL;
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diff changeset
261 #ifdef linux
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diff changeset
262 FILE *fp;
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diff changeset
263 static char temp[BUFSIZ];
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diff changeset
264
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265 sprintf(temp, "/proc/%d/cmdline", getpid());
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266 fp = fopen(temp, "r");
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diff changeset
267 if ( fp != NULL ) {
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diff changeset
268 if ( fgets(temp, sizeof(temp)-1, fp) ) {
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269 progname = strrchr(temp, '/');
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diff changeset
270 if ( progname == NULL ) {
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diff changeset
271 progname = temp;
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diff changeset
272 } else {
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273 progname = progname+1;
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diff changeset
274 }
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diff changeset
275 }
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diff changeset
276 fclose(fp);
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diff changeset
277 }
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diff changeset
278 #endif
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diff changeset
279 return(progname);
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diff changeset
280 }
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diff changeset
281
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diff changeset
282 static int ESD_OpenAudio(_THIS, SDL_AudioSpec *spec)
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diff changeset
283 {
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diff changeset
284 esd_format_t format;
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diff changeset
285
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parents:
diff changeset
286 /* Convert audio spec to the ESD audio format */
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diff changeset
287 format = (ESD_STREAM | ESD_PLAY);
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parents:
diff changeset
288 switch ( spec->format & 0xFF ) {
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parents:
diff changeset
289 case 8:
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diff changeset
290 format |= ESD_BITS8;
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diff changeset
291 break;
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parents:
diff changeset
292 case 16:
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parents:
diff changeset
293 format |= ESD_BITS16;
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diff changeset
294 break;
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diff changeset
295 default:
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diff changeset
296 SDL_SetError("Unsupported ESD audio format");
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diff changeset
297 return(-1);
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parents:
diff changeset
298 }
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parents:
diff changeset
299 if ( spec->channels == 1 ) {
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diff changeset
300 format |= ESD_MONO;
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parents:
diff changeset
301 } else {
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diff changeset
302 format |= ESD_STEREO;
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parents:
diff changeset
303 }
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parents:
diff changeset
304 #if 0
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parents:
diff changeset
305 spec->samples = ESD_BUF_SIZE; /* Darn, no way to change this yet */
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parents:
diff changeset
306 #endif
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diff changeset
307
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diff changeset
308 /* Open a connection to the ESD audio server */
294
d2d48e10f370 Added a new header file: SDL_loadso.h
Sam Lantinga <slouken@libsdl.org>
parents: 252
diff changeset
309 audio_fd = SDL_NAME(esd_play_stream)(format, spec->freq, NULL, get_progname());
0
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parents:
diff changeset
310 if ( audio_fd < 0 ) {
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diff changeset
311 SDL_SetError("Couldn't open ESD connection");
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diff changeset
312 return(-1);
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diff changeset
313 }
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parents:
diff changeset
314
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parents:
diff changeset
315 /* Calculate the final parameters for this audio specification */
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parents:
diff changeset
316 SDL_CalculateAudioSpec(spec);
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diff changeset
317 frame_ticks = (float)(spec->samples*1000)/spec->freq;
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diff changeset
318 next_frame = SDL_GetTicks()+frame_ticks;
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diff changeset
319
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parents:
diff changeset
320 /* Allocate mixing buffer */
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parents:
diff changeset
321 mixlen = spec->size;
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parents:
diff changeset
322 mixbuf = (Uint8 *)SDL_AllocAudioMem(mixlen);
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parents:
diff changeset
323 if ( mixbuf == NULL ) {
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parents:
diff changeset
324 return(-1);
74212992fb08 Initial revision
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parents:
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325 }
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326 memset(mixbuf, spec->silence, spec->size);
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327
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328 /* Get the parent process id (we're the parent of the audio thread) */
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329 parent = getpid();
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330
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331 /* We're ready to rock and roll. :-) */
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332 return(0);
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333 }
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334
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335 #endif /* ESD_SUPPORT */