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annotate src/audio/esd/SDL_esdaudio.c @ 3815:3234d6eee011 SDL-ryan-multiple-audio-device

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Updated esd audio driver for 1.3 API.
author Ryan C. Gordon <icculus@icculus.org>
date Fri, 06 Oct 2006 04:16:11 +0000
parents 7852b5b78af5
children 9d070c1a45fa
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 /* Audio driver functions */
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49 static int ESD_OpenDevice(_THIS, const char *devname, int iscapture);
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50 static void ESD_WaitDevice(_THIS);
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51 static void ESD_PlayDevice(_THIS);
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52 static Uint8 *ESD_GetDeviceBuf(_THIS);
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53 static void ESD_CloseDevice(_THIS);
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54
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55 #ifdef SDL_AUDIO_DRIVER_ESD_DYNAMIC
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56
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57 static const char *esd_library = SDL_AUDIO_DRIVER_ESD_DYNAMIC;
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58 static void *esd_handle = NULL;
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59
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60 static int (*SDL_NAME(esd_open_sound)) (const char *host);
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61 static int (*SDL_NAME(esd_close)) (int esd);
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62 static int (*SDL_NAME(esd_play_stream)) (esd_format_t format, int rate,
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63 const char *host, const char *name);
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64
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65 #define SDL_ESD_SYM(x) { #x, (void **) (char *) &SDL_NAME(x) }
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66 static struct
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67 {
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68 const char *name;
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69 void **func;
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70 } esd_functions[] = {
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71 SDL_ESD_SYM(esd_open_sound),
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72 SDL_ESD_SYM(esd_close),
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73 SDL_ESD_SYM(esd_play_stream),
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74 };
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75 #undef SDL_ESD_SYM
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76
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77 static void
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78 UnloadESDLibrary()
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79 {
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80 if (esd_handle != NULL) {
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81 SDL_UnloadObject(esd_handle);
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82 esd_handle = NULL;
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83 }
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84 }
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85
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86 static int
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87 LoadESDLibrary(void)
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88 {
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89 int i, retval = -1;
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90
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91 if (esd_handle == NULL) {
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92 esd_handle = SDL_LoadObject(esd_library);
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93 if (esd_handle) {
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94 retval = 0;
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95 for (i = 0; i < SDL_arraysize(esd_functions); ++i) {
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96 *esd_functions[i].func =
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97 SDL_LoadFunction(esd_handle, esd_functions[i].name);
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98 if (!*esd_functions[i].func) {
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99 retval = -1;
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100 UnloadESDLibrary();
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101 break;
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102 }
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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
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112 UnloadESDLibrary()
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113 {
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114 return;
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115 }
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116
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117 static int
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118 LoadESDLibrary(void)
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119 {
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120 return 0;
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121 }
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122
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123 #endif /* SDL_AUDIO_DRIVER_ESD_DYNAMIC */
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124
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125 /* Audio driver bootstrap functions */
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126
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127 static int
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128 ESD_Available(void)
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129 {
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130 int available = 0;
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131 if (LoadESDLibrary() == 0) {
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132 int connection;
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133 if (SDL_getenv("ESD_NO_SPAWN") == NULL) {
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134 SDL_putenv("ESD_NO_SPAWN=1"); /* Don't start ESD if it's not running */
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135 }
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136 connection = SDL_NAME(esd_open_sound) (NULL);
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137 if (connection >= 0) {
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138 available = 1;
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139 SDL_NAME(esd_close) (connection);
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140 }
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141 UnloadESDLibrary();
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142 }
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143 return available;
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144 }
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145
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146
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147 static int
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148 ESD_Init(SDL_AudioDriverImpl *impl)
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149 {
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150 /* Set the function pointers */
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151 impl->OpenDevice = ESD_OpenDevice;
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152 impl->PlayDevice = ESD_PlayDevice;
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153 impl->WaitDevice = ESD_WaitDevice;
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154 impl->GetDeviceBuf = ESD_GetDeviceBuf;
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155 impl->CloseDevice = ESD_CloseDevice;
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156 impl->OnlyHasDefaultOutputDevice = 1;
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157
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158 return 1;
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159 }
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160
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161
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162 AudioBootStrap ESD_bootstrap = {
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163 ESD_DRIVER_NAME, "Enlightened Sound Daemon",
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164 ESD_Available, ESD_Init, 0
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165 };
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166
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167 /* This function waits until it is possible to write a full sound buffer */
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168 static void
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169 ESD_WaitDevice(_THIS)
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170 {
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171 Sint32 ticks;
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172
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173 /* Check to see if the thread-parent process is still alive */
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174 {
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175 static int cnt = 0;
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176 /* Note that this only works with thread implementations
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177 that use a different process id for each thread.
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178 */
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179 /* Check every 10 loops */
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180 if (this->hidden->parent && (((++cnt) % 10) == 0)) {
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181 if (kill(this->hidden->parent, 0) < 0) {
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182 this->enabled = 0;
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183 }
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184 }
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185 }
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186
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187 /* Use timer for general audio synchronization */
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188 ticks = ((Sint32) (this->hidden->next_frame-SDL_GetTicks())) - FUDGE_TICKS;
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189 if (ticks > 0) {
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190 SDL_Delay(ticks);
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191 }
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192 }
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193
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194 static void
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195 ESD_PlayDevice(_THIS)
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196 {
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197 int written = 0;
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198
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199 /* Write the audio data, checking for EAGAIN on broken audio drivers */
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200 do {
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201 written = write(this->hidden->audio_fd,
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202 this->hidden->mixbuf,
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203 this->hidden->mixlen);
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204 if ((written < 0) && ((errno == 0) || (errno == EAGAIN))) {
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205 SDL_Delay(1); /* Let a little CPU time go by */
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206 }
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207 }
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208 while ((written < 0) &&
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209 ((errno == 0) || (errno == EAGAIN) || (errno == EINTR)));
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210
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211 /* Set the next write frame */
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212 this->hidden->next_frame += this->hidden->frame_ticks;
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213
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214 /* If we couldn't write, assume fatal error for now */
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215 if (written < 0) {
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216 this->enabled = 0;
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217 }
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218 }
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219
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220 static Uint8 *
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221 ESD_GetDeviceBuf(_THIS)
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222 {
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223 return (this->hidden->mixbuf);
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224 }
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225
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226 static void
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227 ESD_CloseDevice(_THIS)
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228 {
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229 if (this->hidden != NULL) {
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230 if (this->hidden->mixbuf != NULL) {
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231 SDL_FreeAudioMem(this->hidden->mixbuf);
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232 this->hidden->mixbuf = NULL;
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233 }
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234 if (this->hidden->audio_fd >= 0) {
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235 SDL_NAME(esd_close) (this->hidden->audio_fd);
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236 this->hidden->audio_fd = -1;
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237 }
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238
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239 SDL_free(this->hidden);
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240 this->hidden = NULL;
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241 }
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242 UnloadESDLibrary();
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243 }
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244
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245 /* Try to get the name of the program */
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246 static char *
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247 get_progname(void)
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248 {
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249 char *progname = NULL;
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250 #ifdef __LINUX__
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251 FILE *fp;
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252 static char temp[BUFSIZ];
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253
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254 SDL_snprintf(temp, SDL_arraysize(temp), "/proc/%d/cmdline", getpid());
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255 fp = fopen(temp, "r");
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256 if (fp != NULL) {
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257 if (fgets(temp, sizeof(temp) - 1, fp)) {
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258 progname = SDL_strrchr(temp, '/');
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259 if (progname == NULL) {
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260 progname = temp;
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261 } else {
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262 progname = progname + 1;
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263 }
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264 }
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265 fclose(fp);
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266 }
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267 #endif
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268 return (progname);
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269 }
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270
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271
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272 static int
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273 ESD_OpenDevice(_THIS, const char *devname, int iscapture)
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274 {
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275 esd_format_t format = (ESD_STREAM | ESD_PLAY);
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276 SDL_AudioFormat test_format = 0;
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277 int found = 0;
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278
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279 /* Initialize all variables that we clean on shutdown */
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280 this->hidden = (struct SDL_PrivateAudioData *)
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281 SDL_malloc((sizeof *this->hidden));
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282 if (this->hidden == NULL) {
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283 SDL_OutOfMemory();
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284 return 0;
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285 }
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286 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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287 this->hidden->audio_fd = -1;
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288
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289 if (LoadESDLibrary() < 0) {
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290 ESD_CloseDevice(this);
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291 SDL_SetError("ESD: failed to load library: %s", SDL_GetError());
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292 return 0;
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293 }
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294
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295 /* Convert audio spec to the ESD audio format */
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296 /* Try for a closest match on audio format */
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297 for (test_format = SDL_FirstAudioFormat(this->spec.format);
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298 !found && test_format; test_format = SDL_NextAudioFormat()) {
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299 #ifdef DEBUG_AUDIO
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300 fprintf(stderr, "Trying format 0x%4.4x\n", test_format);
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301 #endif
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302 found = 1;
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303 switch (test_format) {
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304 case AUDIO_U8:
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305 format |= ESD_BITS8;
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306 break;
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307 case AUDIO_S16SYS:
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308 format |= ESD_BITS16;
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309 break;
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310 default:
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311 found = 0;
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312 break;
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313 }
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314 }
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315
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316 if (!found) {
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317 ESD_CloseDevice(this);
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318 SDL_SetError("Couldn't find any hardware audio formats");
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319 return 0;
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320 }
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321
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322 if (this->spec.channels == 1) {
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323 format |= ESD_MONO;
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324 } else {
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325 format |= ESD_STEREO;
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326 }
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327 #if 0
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328 this->spec.samples = ESD_BUF_SIZE; /* Darn, no way to change this yet */
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329 #endif
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330
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331 /* Open a connection to the ESD audio server */
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332 this->hidden->audio_fd =
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333 SDL_NAME(esd_play_stream)(format,this->spec.freq,NULL,get_progname());
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334
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335 if (this->hidden->audio_fd < 0) {
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336 ESD_CloseDevice(this);
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337 SDL_SetError("Couldn't open ESD connection");
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338 return 0;
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339 }
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340
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341 /* Calculate the final parameters for this audio specification */
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342 SDL_CalculateAudioSpec(&this->spec);
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343 this->hidden->frame_ticks = (float) (this->spec.samples*1000) / this->spec.freq;
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344 this->hidden->next_frame = SDL_GetTicks() + this->hidden->frame_ticks;
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345
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346 /* Allocate mixing buffer */
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347 this->hidden->mixlen = this->spec.size;
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348 this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen);
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349 if (this->hidden->mixbuf == NULL) {
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350 ESD_CloseDevice(this);
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351 SDL_OutOfMemory();
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352 return 0;
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353 }
3815
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354 SDL_memset(this->hidden->mixbuf, this->spec.silence, this->spec.size);
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355
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356 /* Get the parent process id (we're the parent of the audio thread) */
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357 this->hidden->parent = getpid();
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358
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359 /* We're ready to rock and roll. :-) */
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diff changeset
360 return 1;
0
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diff changeset
361 }
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diff changeset
362
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
363 /* vi: set ts=4 sw=4 expandtab: */