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annotate src/audio/esd/SDL_esdaudio.c @ 2218:6cc82cad8b77

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1.3 video API design chat
author Sam Lantinga <slouken@libsdl.org>
date Tue, 07 Aug 2007 07:08:25 +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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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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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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diff changeset
248 format |= ESD_BITS8;
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249 break;
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diff changeset
250 case AUDIO_S16SYS:
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251 format |= ESD_BITS16;
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diff changeset
252 break;
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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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diff changeset
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: */