annotate src/audio/esd/SDL_esdaudio.c @ 1336:3692456e7b0f

Use SDL_ prefixed versions of C library functions. FIXME: Change #include <stdlib.h> to #include "SDL_stdlib.h" Change #include <string.h> to #include "SDL_string.h" Make sure nothing else broke because of this...
author Sam Lantinga <slouken@libsdl.org>
date Tue, 07 Feb 2006 06:59:48 +0000
parents c9b51268668f
children 604d73db6802
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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
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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 <stdlib.h>
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28 #include <stdio.h>
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29 #include <string.h>
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30 #include <errno.h>
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31 #include <signal.h>
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32 #include <unistd.h>
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33
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34 #include <esd.h>
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35
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36 #include "SDL_audio.h"
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37 #include "SDL_error.h"
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38 #include "SDL_audiomem.h"
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39 #include "SDL_audio_c.h"
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40 #include "SDL_timer.h"
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41 #include "SDL_audiodev_c.h"
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42 #include "SDL_esdaudio.h"
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43
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44 #ifdef ESD_DYNAMIC
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45 #include "SDL_name.h"
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46 #include "SDL_loadso.h"
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47 #else
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48 #define SDL_NAME(X) X
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49 #endif
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50
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51 /* The tag name used by ESD audio */
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52 #define ESD_DRIVER_NAME "esd"
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53
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54 /* Audio driver functions */
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55 static int ESD_OpenAudio(_THIS, SDL_AudioSpec *spec);
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56 static void ESD_WaitAudio(_THIS);
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57 static void ESD_PlayAudio(_THIS);
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58 static Uint8 *ESD_GetAudioBuf(_THIS);
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59 static void ESD_CloseAudio(_THIS);
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60
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61 #ifdef ESD_DYNAMIC
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62
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63 static const char *esd_library = ESD_DYNAMIC;
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64 static void *esd_handle = NULL;
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65 static int esd_loaded = 0;
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66
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67 static int (*SDL_NAME(esd_open_sound))( const char *host );
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68 static int (*SDL_NAME(esd_close))( int esd );
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69 static int (*SDL_NAME(esd_play_stream))( esd_format_t format, int rate,
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70 const char *host, const char *name );
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71 static struct {
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72 const char *name;
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73 void **func;
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74 } esd_functions[] = {
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75 { "esd_open_sound", (void **)&SDL_NAME(esd_open_sound) },
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76 { "esd_close", (void **)&SDL_NAME(esd_close) },
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77 { "esd_play_stream", (void **)&SDL_NAME(esd_play_stream) },
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78 };
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79
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80 static void UnloadESDLibrary()
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81 {
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82 if ( esd_loaded ) {
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83 SDL_UnloadObject(esd_handle);
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84 esd_handle = NULL;
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85 esd_loaded = 0;
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86 }
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87 }
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88
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89 static int LoadESDLibrary(void)
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90 {
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91 int i, retval = -1;
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92
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93 esd_handle = SDL_LoadObject(esd_library);
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94 if ( esd_handle ) {
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95 esd_loaded = 1;
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96 retval = 0;
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97 for ( i=0; i<SDL_TABLESIZE(esd_functions); ++i ) {
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98 *esd_functions[i].func = SDL_LoadFunction(esd_handle, esd_functions[i].name);
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99 if ( !*esd_functions[i].func ) {
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100 retval = -1;
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101 UnloadESDLibrary();
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102 break;
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103 }
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104 }
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105 }
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106 return retval;
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107 }
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108
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109 #else
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110
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111 static void 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 LoadESDLibrary(void)
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117 {
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118 return 0;
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119 }
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120
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121 #endif /* ESD_DYNAMIC */
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122
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123 /* Audio driver bootstrap functions */
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124
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125 static int Audio_Available(void)
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126 {
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127 int connection;
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128 int available;
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129
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130 available = 0;
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131 if ( LoadESDLibrary() < 0 ) {
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132 return available;
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133 }
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134 connection = SDL_NAME(esd_open_sound)(NULL);
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135 if ( connection >= 0 ) {
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136 available = 1;
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137 SDL_NAME(esd_close)(connection);
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138 }
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139 UnloadESDLibrary();
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140 return(available);
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141 }
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142
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143 static void Audio_DeleteDevice(SDL_AudioDevice *device)
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144 {
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145 SDL_free(device->hidden);
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146 SDL_free(device);
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147 UnloadESDLibrary();
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148 }
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149
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150 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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151 {
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152 SDL_AudioDevice *this;
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153
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154 /* Initialize all variables that we clean on shutdown */
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155 LoadESDLibrary();
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156 this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice));
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157 if ( this ) {
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158 SDL_memset(this, 0, (sizeof *this));
0
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159 this->hidden = (struct SDL_PrivateAudioData *)
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160 SDL_malloc((sizeof *this->hidden));
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161 }
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162 if ( (this == NULL) || (this->hidden == NULL) ) {
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163 SDL_OutOfMemory();
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164 if ( this ) {
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165 SDL_free(this);
0
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166 }
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167 return(0);
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168 }
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169 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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170 audio_fd = -1;
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171
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172 /* Set the function pointers */
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173 this->OpenAudio = ESD_OpenAudio;
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174 this->WaitAudio = ESD_WaitAudio;
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175 this->PlayAudio = ESD_PlayAudio;
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176 this->GetAudioBuf = ESD_GetAudioBuf;
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177 this->CloseAudio = ESD_CloseAudio;
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178
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179 this->free = Audio_DeleteDevice;
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180
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181 return this;
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182 }
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183
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184 AudioBootStrap ESD_bootstrap = {
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185 ESD_DRIVER_NAME, "Enlightened Sound Daemon",
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186 Audio_Available, Audio_CreateDevice
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187 };
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188
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189 /* This function waits until it is possible to write a full sound buffer */
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190 static void ESD_WaitAudio(_THIS)
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191 {
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192 Sint32 ticks;
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193
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194 /* Check to see if the thread-parent process is still alive */
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195 { static int cnt = 0;
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196 /* Note that this only works with thread implementations
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197 that use a different process id for each thread.
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198 */
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199 if (parent && (((++cnt)%10) == 0)) { /* Check every 10 loops */
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200 if ( kill(parent, 0) < 0 ) {
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201 this->enabled = 0;
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202 }
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203 }
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204 }
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205
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206 /* Use timer for general audio synchronization */
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207 ticks = ((Sint32)(next_frame - SDL_GetTicks()))-FUDGE_TICKS;
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208 if ( ticks > 0 ) {
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209 SDL_Delay(ticks);
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210 }
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211 }
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212
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213 static void ESD_PlayAudio(_THIS)
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214 {
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215 int written;
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216
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217 /* Write the audio data, checking for EAGAIN on broken audio drivers */
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218 do {
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219 written = write(audio_fd, mixbuf, mixlen);
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220 if ( (written < 0) && ((errno == 0) || (errno == EAGAIN)) ) {
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221 SDL_Delay(1); /* Let a little CPU time go by */
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222 }
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223 } while ( (written < 0) &&
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224 ((errno == 0) || (errno == EAGAIN) || (errno == EINTR)) );
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225
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226 /* Set the next write frame */
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227 next_frame += frame_ticks;
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228
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229 /* If we couldn't write, assume fatal error for now */
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230 if ( written < 0 ) {
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231 this->enabled = 0;
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232 }
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233 }
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234
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235 static Uint8 *ESD_GetAudioBuf(_THIS)
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236 {
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237 return(mixbuf);
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238 }
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239
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240 static void ESD_CloseAudio(_THIS)
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241 {
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242 if ( mixbuf != NULL ) {
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243 SDL_FreeAudioMem(mixbuf);
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244 mixbuf = NULL;
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245 }
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246 if ( audio_fd >= 0 ) {
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247 SDL_NAME(esd_close)(audio_fd);
0
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248 audio_fd = -1;
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249 }
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250 }
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251
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252 /* Try to get the name of the program */
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253 static char *get_progname(void)
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254 {
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255 char *progname = NULL;
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256 #ifdef linux
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257 FILE *fp;
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258 static char temp[BUFSIZ];
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259
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260 sprintf(temp, "/proc/%d/cmdline", getpid());
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261 fp = fopen(temp, "r");
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262 if ( fp != NULL ) {
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263 if ( fgets(temp, sizeof(temp)-1, fp) ) {
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264 progname = SDL_strrchr(temp, '/');
0
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265 if ( progname == NULL ) {
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266 progname = temp;
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267 } else {
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268 progname = progname+1;
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269 }
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270 }
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271 fclose(fp);
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272 }
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273 #endif
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274 return(progname);
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275 }
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276
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277 static int ESD_OpenAudio(_THIS, SDL_AudioSpec *spec)
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278 {
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279 esd_format_t format;
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280
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281 /* Convert audio spec to the ESD audio format */
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282 format = (ESD_STREAM | ESD_PLAY);
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diff changeset
283 switch ( spec->format & 0xFF ) {
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diff changeset
284 case 8:
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285 format |= ESD_BITS8;
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diff changeset
286 break;
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diff changeset
287 case 16:
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diff changeset
288 format |= ESD_BITS16;
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diff changeset
289 break;
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diff changeset
290 default:
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diff changeset
291 SDL_SetError("Unsupported ESD audio format");
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292 return(-1);
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293 }
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diff changeset
294 if ( spec->channels == 1 ) {
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295 format |= ESD_MONO;
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296 } else {
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297 format |= ESD_STEREO;
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diff changeset
298 }
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diff changeset
299 #if 0
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300 spec->samples = ESD_BUF_SIZE; /* Darn, no way to change this yet */
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301 #endif
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302
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303 /* Open a connection to the ESD audio server */
294
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diff changeset
304 audio_fd = SDL_NAME(esd_play_stream)(format, spec->freq, NULL, get_progname());
0
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parents:
diff changeset
305 if ( audio_fd < 0 ) {
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diff changeset
306 SDL_SetError("Couldn't open ESD connection");
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diff changeset
307 return(-1);
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diff changeset
308 }
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diff changeset
309
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diff changeset
310 /* Calculate the final parameters for this audio specification */
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diff changeset
311 SDL_CalculateAudioSpec(spec);
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312 frame_ticks = (float)(spec->samples*1000)/spec->freq;
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313 next_frame = SDL_GetTicks()+frame_ticks;
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314
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diff changeset
315 /* Allocate mixing buffer */
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diff changeset
316 mixlen = spec->size;
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diff changeset
317 mixbuf = (Uint8 *)SDL_AllocAudioMem(mixlen);
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diff changeset
318 if ( mixbuf == NULL ) {
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diff changeset
319 return(-1);
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diff changeset
320 }
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3692456e7b0f Use SDL_ prefixed versions of C library functions.
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321 SDL_memset(mixbuf, spec->silence, spec->size);
0
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322
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323 /* Get the parent process id (we're the parent of the audio thread) */
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324 parent = getpid();
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325
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326 /* We're ready to rock and roll. :-) */
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327 return(0);
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328 }
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329
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330 #endif /* ESD_SUPPORT */