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annotate src/audio/esd/SDL_esdaudio.c @ 2349:0381047f2210 gsoc2008_iphone

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The class SDL_uikitappdelegate acts as the UIApplicationDelegate for an iPhone SDL project. This class is reponsible for application control flow, including initial setup of working directory, forwarding command line arguments to the user's main function, and handling application termination.
author Holmes Futrell <hfutrell@umail.ucsb.edu>
date Thu, 17 Jul 2008 22:29:37 +0000
parents 866052b01ee5
children e27bdcc80744
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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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_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 #ifdef SDL_AUDIO_DRIVER_ESD_DYNAMIC
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49
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50 static const char *esd_library = SDL_AUDIO_DRIVER_ESD_DYNAMIC;
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51 static void *esd_handle = NULL;
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52
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53 static int (*SDL_NAME(esd_open_sound)) (const char *host);
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54 static int (*SDL_NAME(esd_close)) (int esd);
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55 static int (*SDL_NAME(esd_play_stream)) (esd_format_t format, int rate,
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56 const char *host, const char *name);
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57
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58 #define SDL_ESD_SYM(x) { #x, (void **) (char *) &SDL_NAME(x) }
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59 static struct
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60 {
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61 const char *name;
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62 void **func;
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63 } esd_functions[] = {
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64 SDL_ESD_SYM(esd_open_sound),
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65 SDL_ESD_SYM(esd_close), SDL_ESD_SYM(esd_play_stream),};
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66 #undef SDL_ESD_SYM
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67
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68 static void
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69 UnloadESDLibrary()
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70 {
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71 if (esd_handle != NULL) {
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72 SDL_UnloadObject(esd_handle);
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73 esd_handle = NULL;
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74 }
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75 }
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76
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77 static int
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78 LoadESDLibrary(void)
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79 {
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80 int i, retval = -1;
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81
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82 if (esd_handle == NULL) {
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83 esd_handle = SDL_LoadObject(esd_library);
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84 if (esd_handle) {
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85 retval = 0;
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86 for (i = 0; i < SDL_arraysize(esd_functions); ++i) {
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87 *esd_functions[i].func =
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88 SDL_LoadFunction(esd_handle, esd_functions[i].name);
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89 if (!*esd_functions[i].func) {
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90 retval = -1;
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91 UnloadESDLibrary();
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92 break;
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93 }
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94 }
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95 }
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96 }
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97 return retval;
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98 }
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99
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100 #else
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101
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102 static void
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103 UnloadESDLibrary()
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104 {
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105 return;
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106 }
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107
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108 static int
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109 LoadESDLibrary(void)
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110 {
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111 return 0;
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112 }
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113
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114 #endif /* SDL_AUDIO_DRIVER_ESD_DYNAMIC */
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115
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116
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117 /* This function waits until it is possible to write a full sound buffer */
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118 static void
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119 ESD_WaitDevice(_THIS)
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120 {
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121 Sint32 ticks;
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122
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123 /* Check to see if the thread-parent process is still alive */
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124 {
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125 static int cnt = 0;
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126 /* Note that this only works with thread implementations
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127 that use a different process id for each thread.
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128 */
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129 /* Check every 10 loops */
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130 if (this->hidden->parent && (((++cnt) % 10) == 0)) {
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131 if (kill(this->hidden->parent, 0) < 0) {
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132 this->enabled = 0;
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133 }
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134 }
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135 }
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136
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137 /* Use timer for general audio synchronization */
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138 ticks =
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139 ((Sint32) (this->hidden->next_frame - SDL_GetTicks())) - FUDGE_TICKS;
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140 if (ticks > 0) {
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141 SDL_Delay(ticks);
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142 }
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143 }
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144
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145 static void
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146 ESD_PlayDevice(_THIS)
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147 {
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148 int written = 0;
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149
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150 /* Write the audio data, checking for EAGAIN on broken audio drivers */
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151 do {
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152 written = write(this->hidden->audio_fd,
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153 this->hidden->mixbuf, this->hidden->mixlen);
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154 if ((written < 0) && ((errno == 0) || (errno == EAGAIN))) {
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155 SDL_Delay(1); /* Let a little CPU time go by */
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156 }
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157 }
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158 while ((written < 0) &&
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159 ((errno == 0) || (errno == EAGAIN) || (errno == EINTR)));
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160
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161 /* Set the next write frame */
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162 this->hidden->next_frame += this->hidden->frame_ticks;
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163
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164 /* If we couldn't write, assume fatal error for now */
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165 if (written < 0) {
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166 this->enabled = 0;
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167 }
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168 }
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169
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170 static Uint8 *
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171 ESD_GetDeviceBuf(_THIS)
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172 {
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173 return (this->hidden->mixbuf);
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174 }
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175
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176 static void
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177 ESD_CloseDevice(_THIS)
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178 {
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179 if (this->hidden != NULL) {
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180 if (this->hidden->mixbuf != NULL) {
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181 SDL_FreeAudioMem(this->hidden->mixbuf);
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182 this->hidden->mixbuf = NULL;
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183 }
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184 if (this->hidden->audio_fd >= 0) {
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185 SDL_NAME(esd_close) (this->hidden->audio_fd);
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186 this->hidden->audio_fd = -1;
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187 }
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188
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189 SDL_free(this->hidden);
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190 this->hidden = NULL;
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191 }
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192 }
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193
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194 /* Try to get the name of the program */
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195 static char *
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196 get_progname(void)
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197 {
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198 char *progname = NULL;
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d910939febfa Use consistent identifiers for the various platforms we support.
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199 #ifdef __LINUX__
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200 FILE *fp;
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201 static char temp[BUFSIZ];
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202
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203 SDL_snprintf(temp, SDL_arraysize(temp), "/proc/%d/cmdline", getpid());
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204 fp = fopen(temp, "r");
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205 if (fp != NULL) {
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206 if (fgets(temp, sizeof(temp) - 1, fp)) {
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207 progname = SDL_strrchr(temp, '/');
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208 if (progname == NULL) {
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209 progname = temp;
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210 } else {
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211 progname = progname + 1;
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212 }
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213 }
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214 fclose(fp);
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215 }
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216 #endif
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217 return (progname);
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218 }
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219
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220
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221 static int
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diff changeset
222 ESD_OpenDevice(_THIS, const char *devname, int iscapture)
0
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223 {
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diff changeset
224 esd_format_t format = (ESD_STREAM | ESD_PLAY);
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225 SDL_AudioFormat test_format = 0;
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diff changeset
226 int found = 0;
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227
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diff changeset
228 /* Initialize all variables that we clean on shutdown */
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diff changeset
229 this->hidden = (struct SDL_PrivateAudioData *)
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230 SDL_malloc((sizeof *this->hidden));
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diff changeset
231 if (this->hidden == NULL) {
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232 SDL_OutOfMemory();
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233 return 0;
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234 }
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diff changeset
235 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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236 this->hidden->audio_fd = -1;
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237
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238 /* Convert audio spec to the ESD audio format */
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diff changeset
239 /* Try for a closest match on audio format */
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diff changeset
240 for (test_format = SDL_FirstAudioFormat(this->spec.format);
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241 !found && test_format; test_format = SDL_NextAudioFormat()) {
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diff changeset
242 #ifdef DEBUG_AUDIO
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diff changeset
243 fprintf(stderr, "Trying format 0x%4.4x\n", test_format);
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diff changeset
244 #endif
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diff changeset
245 found = 1;
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diff changeset
246 switch (test_format) {
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247 case AUDIO_U8:
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248 format |= ESD_BITS8;
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249 break;
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diff changeset
250 case AUDIO_S16SYS:
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diff changeset
251 format |= ESD_BITS16;
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diff changeset
252 break;
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diff changeset
253 default:
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254 found = 0;
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diff changeset
255 break;
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diff changeset
256 }
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257 }
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258
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diff changeset
259 if (!found) {
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diff changeset
260 ESD_CloseDevice(this);
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diff changeset
261 SDL_SetError("Couldn't find any hardware audio formats");
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262 return 0;
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263 }
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264
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265 if (this->spec.channels == 1) {
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266 format |= ESD_MONO;
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267 } else {
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268 format |= ESD_STEREO;
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269 }
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270 #if 0
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271 this->spec.samples = ESD_BUF_SIZE; /* Darn, no way to change this yet */
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272 #endif
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273
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274 /* Open a connection to the ESD audio server */
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275 this->hidden->audio_fd =
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276 SDL_NAME(esd_play_stream) (format, this->spec.freq, NULL,
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277 get_progname());
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278
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279 if (this->hidden->audio_fd < 0) {
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280 ESD_CloseDevice(this);
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281 SDL_SetError("Couldn't open ESD connection");
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282 return 0;
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283 }
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284
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285 /* Calculate the final parameters for this audio specification */
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286 SDL_CalculateAudioSpec(&this->spec);
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287 this->hidden->frame_ticks =
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288 (float) (this->spec.samples * 1000) / this->spec.freq;
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289 this->hidden->next_frame = SDL_GetTicks() + this->hidden->frame_ticks;
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290
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291 /* Allocate mixing buffer */
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292 this->hidden->mixlen = this->spec.size;
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293 this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen);
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294 if (this->hidden->mixbuf == NULL) {
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295 ESD_CloseDevice(this);
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296 SDL_OutOfMemory();
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297 return 0;
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298 }
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299 SDL_memset(this->hidden->mixbuf, this->spec.silence, this->spec.size);
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300
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301 /* Get the parent process id (we're the parent of the audio thread) */
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302 this->hidden->parent = getpid();
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303
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304 /* We're ready to rock and roll. :-) */
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305 return 1;
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306 }
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307
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308 static void
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309 ESD_Deinitialize(void)
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310 {
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311 UnloadESDLibrary();
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312 }
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313
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314 static int
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315 ESD_Init(SDL_AudioDriverImpl * impl)
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316 {
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317 if (LoadESDLibrary() < 0) {
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318 return 0;
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319 } else {
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320 int connection = 0;
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321
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322 /* Don't start ESD if it's not running */
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323 if (SDL_getenv("ESD_NO_SPAWN") == NULL) {
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324 SDL_putenv("ESD_NO_SPAWN=1");
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325 }
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326
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327 connection = SDL_NAME(esd_open_sound) (NULL);
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328 if (connection < 0) {
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329 UnloadESDLibrary();
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330 SDL_SetError("ESD: esd_open_sound failed (no audio server?)");
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331 return 0;
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332 }
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333 SDL_NAME(esd_close) (connection);
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334 }
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335
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336 /* Set the function pointers */
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337 impl->OpenDevice = ESD_OpenDevice;
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338 impl->PlayDevice = ESD_PlayDevice;
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339 impl->WaitDevice = ESD_WaitDevice;
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340 impl->GetDeviceBuf = ESD_GetDeviceBuf;
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341 impl->CloseDevice = ESD_CloseDevice;
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342 impl->Deinitialize = ESD_Deinitialize;
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343 impl->OnlyHasDefaultOutputDevice = 1;
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344
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345 return 1;
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346 }
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347
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348
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349 AudioBootStrap ESD_bootstrap = {
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350 ESD_DRIVER_NAME, "Enlightened Sound Daemon", ESD_Init, 0
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351 };
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352
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353 /* vi: set ts=4 sw=4 expandtab: */