Mercurial > sdl-ios-xcode
annotate src/audio/esd/SDL_esdaudio.c @ 5068:231dbbc3e31c
Fixed atomic intrinsic test
author | Sam Lantinga <slouken@libsdl.org> |
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date | Fri, 21 Jan 2011 21:35:43 -0800 |
parents | 4160ba33b597 |
children | b530ef003506 |
rev | line source |
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0 | 1 /* |
2 SDL - Simple DirectMedia Layer | |
3697 | 3 Copyright (C) 1997-2010 Sam Lantinga |
0 | 4 |
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 |
0 | 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. |
0 | 9 |
10 This library is distributed in the hope that it will be useful, | |
11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
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13 Lesser General Public License for more details. |
0 | 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 |
0 | 18 |
19 Sam Lantinga | |
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20 slouken@libsdl.org |
0 | 21 */ |
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22 #include "SDL_config.h" |
0 | 23 |
24 /* Allow access to an ESD network stream mixing buffer */ | |
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> |
0 | 29 #include <errno.h> |
30 #include <esd.h> | |
31 | |
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32 #include "SDL_timer.h" |
0 | 33 #include "SDL_audio.h" |
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34 #include "../SDL_audiomem.h" |
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35 #include "../SDL_audio_c.h" |
0 | 36 #include "SDL_esdaudio.h" |
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 |
0 | 45 /* The tag name used by ESD audio */ |
46 #define ESD_DRIVER_NAME "esd" | |
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; |
3162 | 63 } const esd_functions[] = { |
64 SDL_ESD_SYM(esd_open_sound), | |
65 SDL_ESD_SYM(esd_close), SDL_ESD_SYM(esd_play_stream), | |
66 }; | |
67 | |
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68 #undef SDL_ESD_SYM |
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69 |
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70 static void |
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71 UnloadESDLibrary() |
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72 { |
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73 if (esd_handle != NULL) { |
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74 SDL_UnloadObject(esd_handle); |
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75 esd_handle = NULL; |
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76 } |
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77 } |
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78 |
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79 static int |
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80 LoadESDLibrary(void) |
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81 { |
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82 int i, retval = -1; |
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83 |
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84 if (esd_handle == NULL) { |
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85 esd_handle = SDL_LoadObject(esd_library); |
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86 if (esd_handle) { |
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87 retval = 0; |
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88 for (i = 0; i < SDL_arraysize(esd_functions); ++i) { |
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89 *esd_functions[i].func = |
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90 SDL_LoadFunction(esd_handle, esd_functions[i].name); |
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91 if (!*esd_functions[i].func) { |
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92 retval = -1; |
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93 UnloadESDLibrary(); |
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94 break; |
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95 } |
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96 } |
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97 } |
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98 } |
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99 return retval; |
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100 } |
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101 |
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102 #else |
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103 |
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104 static void |
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105 UnloadESDLibrary() |
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106 { |
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107 return; |
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108 } |
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109 |
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110 static int |
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111 LoadESDLibrary(void) |
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112 { |
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113 return 0; |
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114 } |
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115 |
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116 #endif /* SDL_AUDIO_DRIVER_ESD_DYNAMIC */ |
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117 |
0 | 118 |
119 /* This function waits until it is possible to write a full sound buffer */ | |
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120 static void |
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121 ESD_WaitDevice(_THIS) |
0 | 122 { |
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123 Sint32 ticks; |
0 | 124 |
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125 /* Check to see if the thread-parent process is still alive */ |
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126 { |
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127 static int cnt = 0; |
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128 /* Note that this only works with thread implementations |
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129 that use a different process id for each thread. |
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130 */ |
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131 /* Check every 10 loops */ |
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132 if (this->hidden->parent && (((++cnt) % 10) == 0)) { |
3068 | 133 if (kill(this->hidden->parent, 0) < 0 && errno == ESRCH) { |
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134 this->enabled = 0; |
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135 } |
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136 } |
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137 } |
0 | 138 |
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139 /* Use timer for general audio synchronization */ |
2060 | 140 ticks = |
141 ((Sint32) (this->hidden->next_frame - SDL_GetTicks())) - FUDGE_TICKS; | |
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142 if (ticks > 0) { |
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143 SDL_Delay(ticks); |
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144 } |
0 | 145 } |
146 | |
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147 static void |
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148 ESD_PlayDevice(_THIS) |
0 | 149 { |
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150 int written = 0; |
0 | 151 |
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152 /* Write the audio data, checking for EAGAIN on broken audio drivers */ |
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153 do { |
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154 written = write(this->hidden->audio_fd, |
2060 | 155 this->hidden->mixbuf, this->hidden->mixlen); |
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156 if ((written < 0) && ((errno == 0) || (errno == EAGAIN))) { |
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157 SDL_Delay(1); /* Let a little CPU time go by */ |
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158 } |
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159 } while ((written < 0) && |
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160 ((errno == 0) || (errno == EAGAIN) || (errno == EINTR))); |
0 | 161 |
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162 /* Set the next write frame */ |
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163 this->hidden->next_frame += this->hidden->frame_ticks; |
0 | 164 |
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165 /* If we couldn't write, assume fatal error for now */ |
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166 if (written < 0) { |
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167 this->enabled = 0; |
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168 } |
0 | 169 } |
170 | |
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171 static Uint8 * |
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172 ESD_GetDeviceBuf(_THIS) |
0 | 173 { |
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174 return (this->hidden->mixbuf); |
0 | 175 } |
176 | |
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177 static void |
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178 ESD_CloseDevice(_THIS) |
0 | 179 { |
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180 if (this->hidden != NULL) { |
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181 if (this->hidden->mixbuf != NULL) { |
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182 SDL_FreeAudioMem(this->hidden->mixbuf); |
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183 this->hidden->mixbuf = NULL; |
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184 } |
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185 if (this->hidden->audio_fd >= 0) { |
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186 SDL_NAME(esd_close) (this->hidden->audio_fd); |
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187 this->hidden->audio_fd = -1; |
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188 } |
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189 |
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190 SDL_free(this->hidden); |
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191 this->hidden = NULL; |
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192 } |
0 | 193 } |
194 | |
195 /* Try to get the name of the program */ | |
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196 static char * |
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197 get_progname(void) |
0 | 198 { |
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199 char *progname = NULL; |
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200 #ifdef __LINUX__ |
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201 FILE *fp; |
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202 static char temp[BUFSIZ]; |
0 | 203 |
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204 SDL_snprintf(temp, SDL_arraysize(temp), "/proc/%d/cmdline", getpid()); |
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205 fp = fopen(temp, "r"); |
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206 if (fp != NULL) { |
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207 if (fgets(temp, sizeof(temp) - 1, fp)) { |
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208 progname = SDL_strrchr(temp, '/'); |
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209 if (progname == NULL) { |
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210 progname = temp; |
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211 } else { |
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212 progname = progname + 1; |
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213 } |
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214 } |
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215 fclose(fp); |
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216 } |
0 | 217 #endif |
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218 return (progname); |
0 | 219 } |
220 | |
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221 |
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222 static int |
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223 ESD_OpenDevice(_THIS, const char *devname, int iscapture) |
0 | 224 { |
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225 esd_format_t format = (ESD_STREAM | ESD_PLAY); |
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226 SDL_AudioFormat test_format = 0; |
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227 int found = 0; |
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228 |
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229 /* Initialize all variables that we clean on shutdown */ |
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230 this->hidden = (struct SDL_PrivateAudioData *) |
2060 | 231 SDL_malloc((sizeof *this->hidden)); |
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232 if (this->hidden == NULL) { |
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233 SDL_OutOfMemory(); |
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234 return 0; |
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235 } |
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236 SDL_memset(this->hidden, 0, (sizeof *this->hidden)); |
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237 this->hidden->audio_fd = -1; |
0 | 238 |
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239 /* Convert audio spec to the ESD audio format */ |
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240 /* Try for a closest match on audio format */ |
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241 for (test_format = SDL_FirstAudioFormat(this->spec.format); |
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242 !found && test_format; test_format = SDL_NextAudioFormat()) { |
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243 #ifdef DEBUG_AUDIO |
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244 fprintf(stderr, "Trying format 0x%4.4x\n", test_format); |
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245 #endif |
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246 found = 1; |
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247 switch (test_format) { |
2060 | 248 case AUDIO_U8: |
249 format |= ESD_BITS8; | |
250 break; | |
251 case AUDIO_S16SYS: | |
252 format |= ESD_BITS16; | |
253 break; | |
254 default: | |
255 found = 0; | |
256 break; | |
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257 } |
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258 } |
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259 |
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260 if (!found) { |
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261 ESD_CloseDevice(this); |
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262 SDL_SetError("Couldn't find any hardware audio formats"); |
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263 return 0; |
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264 } |
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265 |
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266 if (this->spec.channels == 1) { |
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267 format |= ESD_MONO; |
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268 } else { |
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269 format |= ESD_STEREO; |
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270 } |
0 | 271 #if 0 |
2060 | 272 this->spec.samples = ESD_BUF_SIZE; /* Darn, no way to change this yet */ |
0 | 273 #endif |
274 | |
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275 /* Open a connection to the ESD audio server */ |
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276 this->hidden->audio_fd = |
2060 | 277 SDL_NAME(esd_play_stream) (format, this->spec.freq, NULL, |
278 get_progname()); | |
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279 |
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280 if (this->hidden->audio_fd < 0) { |
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281 ESD_CloseDevice(this); |
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282 SDL_SetError("Couldn't open ESD connection"); |
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283 return 0; |
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284 } |
0 | 285 |
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286 /* Calculate the final parameters for this audio specification */ |
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287 SDL_CalculateAudioSpec(&this->spec); |
2060 | 288 this->hidden->frame_ticks = |
289 (float) (this->spec.samples * 1000) / this->spec.freq; | |
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290 this->hidden->next_frame = SDL_GetTicks() + this->hidden->frame_ticks; |
0 | 291 |
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292 /* Allocate mixing buffer */ |
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293 this->hidden->mixlen = this->spec.size; |
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294 this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen); |
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295 if (this->hidden->mixbuf == NULL) { |
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296 ESD_CloseDevice(this); |
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297 SDL_OutOfMemory(); |
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298 return 0; |
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299 } |
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300 SDL_memset(this->hidden->mixbuf, this->spec.silence, this->spec.size); |
0 | 301 |
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302 /* Get the parent process id (we're the parent of the audio thread) */ |
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303 this->hidden->parent = getpid(); |
0 | 304 |
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305 /* We're ready to rock and roll. :-) */ |
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306 return 1; |
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307 } |
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308 |
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309 static void |
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310 ESD_Deinitialize(void) |
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311 { |
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312 UnloadESDLibrary(); |
0 | 313 } |
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314 |
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315 static int |
2060 | 316 ESD_Init(SDL_AudioDriverImpl * impl) |
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317 { |
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318 if (LoadESDLibrary() < 0) { |
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319 return 0; |
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320 } else { |
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321 int connection = 0; |
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322 |
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323 /* Don't start ESD if it's not running */ |
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324 SDL_setenv("ESD_NO_SPAWN", "1", 0); |
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325 |
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326 connection = SDL_NAME(esd_open_sound) (NULL); |
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327 if (connection < 0) { |
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328 UnloadESDLibrary(); |
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329 SDL_SetError("ESD: esd_open_sound failed (no audio server?)"); |
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330 return 0; |
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331 } |
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332 SDL_NAME(esd_close) (connection); |
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333 } |
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334 |
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335 /* Set the function pointers */ |
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336 impl->OpenDevice = ESD_OpenDevice; |
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337 impl->PlayDevice = ESD_PlayDevice; |
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338 impl->WaitDevice = ESD_WaitDevice; |
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339 impl->GetDeviceBuf = ESD_GetDeviceBuf; |
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340 impl->CloseDevice = ESD_CloseDevice; |
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341 impl->Deinitialize = ESD_Deinitialize; |
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342 impl->OnlyHasDefaultOutputDevice = 1; |
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343 |
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344 return 1; /* this audio target is available. */ |
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345 } |
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346 |
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347 |
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348 AudioBootStrap ESD_bootstrap = { |
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349 ESD_DRIVER_NAME, "Enlightened Sound Daemon", ESD_Init, 0 |
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350 }; |
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351 |
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352 /* vi: set ts=4 sw=4 expandtab: */ |