Mercurial > sdl-ios-xcode
annotate src/audio/arts/SDL_artsaudio.c @ 5135:5f09cb749d75
Added vim spacing hints
author | Sam Lantinga <slouken@libsdl.org> |
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date | Tue, 01 Feb 2011 09:00:47 -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 a raw mixing buffer */ | |
25 | |
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26 #ifdef HAVE_SIGNAL_H |
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27 #include <signal.h> |
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28 #endif |
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29 #include <unistd.h> |
3068 | 30 #include <errno.h> |
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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_artsaudio.h" |
37 | |
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38 #ifdef SDL_AUDIO_DRIVER_ARTS_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 artsc audio */ |
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46 #define ARTS_DRIVER_NAME "arts" |
0 | 47 |
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48 #ifdef SDL_AUDIO_DRIVER_ARTS_DYNAMIC |
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49 |
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50 static const char *arts_library = SDL_AUDIO_DRIVER_ARTS_DYNAMIC; |
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51 static void *arts_handle = NULL; |
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52 |
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53 /* !!! FIXME: I hate this SDL_NAME clutter...it makes everything so messy! */ |
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54 static int (*SDL_NAME(arts_init)) (void); |
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55 static void (*SDL_NAME(arts_free)) (void); |
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56 static arts_stream_t(*SDL_NAME(arts_play_stream)) (int rate, int bits, |
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57 int channels, |
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58 const char *name); |
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59 static int (*SDL_NAME(arts_stream_set)) (arts_stream_t s, |
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60 arts_parameter_t param, int value); |
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61 static int (*SDL_NAME(arts_stream_get)) (arts_stream_t s, |
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62 arts_parameter_t param); |
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63 static int (*SDL_NAME(arts_write)) (arts_stream_t s, const void *buffer, |
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64 int count); |
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65 static void (*SDL_NAME(arts_close_stream)) (arts_stream_t s); |
2141 | 66 static int (*SDL_NAME(arts_suspended)) (void); |
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67 static const char *(*SDL_NAME(arts_error_text)) (int errorcode); |
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68 |
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69 #define SDL_ARTS_SYM(x) { #x, (void **) (char *) &SDL_NAME(x) } |
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70 static struct |
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71 { |
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72 const char *name; |
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73 void **func; |
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74 } arts_functions[] = { |
2141 | 75 /* *INDENT-OFF* */ |
76 SDL_ARTS_SYM(arts_init), | |
77 SDL_ARTS_SYM(arts_free), | |
78 SDL_ARTS_SYM(arts_play_stream), | |
79 SDL_ARTS_SYM(arts_stream_set), | |
80 SDL_ARTS_SYM(arts_stream_get), | |
81 SDL_ARTS_SYM(arts_write), | |
82 SDL_ARTS_SYM(arts_close_stream), | |
83 SDL_ARTS_SYM(arts_suspended), | |
84 SDL_ARTS_SYM(arts_error_text), | |
85 /* *INDENT-ON* */ | |
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86 }; |
2141 | 87 |
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88 #undef SDL_ARTS_SYM |
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89 |
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90 static void |
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91 UnloadARTSLibrary() |
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92 { |
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93 if (arts_handle != NULL) { |
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94 SDL_UnloadObject(arts_handle); |
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95 arts_handle = NULL; |
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96 } |
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97 } |
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98 |
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99 static int |
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100 LoadARTSLibrary(void) |
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101 { |
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102 int i, retval = -1; |
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103 |
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104 if (arts_handle == NULL) { |
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105 arts_handle = SDL_LoadObject(arts_library); |
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106 if (arts_handle != NULL) { |
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107 retval = 0; |
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108 for (i = 0; i < SDL_arraysize(arts_functions); ++i) { |
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109 *arts_functions[i].func = |
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110 SDL_LoadFunction(arts_handle, arts_functions[i].name); |
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111 if (!*arts_functions[i].func) { |
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112 retval = -1; |
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113 UnloadARTSLibrary(); |
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114 break; |
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115 } |
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116 } |
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117 } |
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118 } |
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119 |
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120 return retval; |
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121 } |
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122 |
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123 #else |
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124 |
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125 static void |
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126 UnloadARTSLibrary() |
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127 { |
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128 return; |
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129 } |
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130 |
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131 static int |
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132 LoadARTSLibrary(void) |
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133 { |
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134 return 0; |
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135 } |
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136 |
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137 #endif /* SDL_AUDIO_DRIVER_ARTS_DYNAMIC */ |
294
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138 |
0 | 139 /* This function waits until it is possible to write a full sound buffer */ |
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140 static void |
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141 ARTS_WaitDevice(_THIS) |
0 | 142 { |
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143 Sint32 ticks; |
0 | 144 |
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145 /* Check to see if the thread-parent process is still alive */ |
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146 { |
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147 static int cnt = 0; |
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148 /* Note that this only works with thread implementations |
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149 that use a different process id for each thread. |
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150 */ |
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151 /* Check every 10 loops */ |
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152 if (this->hidden->parent && (((++cnt) % 10) == 0)) { |
3068 | 153 if (kill(this->hidden->parent, 0) < 0 && errno == ESRCH) { |
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154 this->enabled = 0; |
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155 } |
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156 } |
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157 } |
0 | 158 |
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159 /* Use timer for general audio synchronization */ |
2060 | 160 ticks = |
161 ((Sint32) (this->hidden->next_frame - SDL_GetTicks())) - FUDGE_TICKS; | |
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162 if (ticks > 0) { |
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163 SDL_Delay(ticks); |
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164 } |
0 | 165 } |
166 | |
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167 static void |
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168 ARTS_PlayDevice(_THIS) |
0 | 169 { |
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170 /* Write the audio data */ |
2060 | 171 int written = SDL_NAME(arts_write) (this->hidden->stream, |
172 this->hidden->mixbuf, | |
173 this->hidden->mixlen); | |
0 | 174 |
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175 /* If timer synchronization is enabled, set the next write frame */ |
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176 if (this->hidden->frame_ticks) { |
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177 this->hidden->next_frame += this->hidden->frame_ticks; |
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178 } |
0 | 179 |
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180 /* If we couldn't write, assume fatal error for now */ |
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181 if (written < 0) { |
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182 this->enabled = 0; |
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183 } |
0 | 184 #ifdef DEBUG_AUDIO |
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185 fprintf(stderr, "Wrote %d bytes of audio data\n", written); |
0 | 186 #endif |
187 } | |
188 | |
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189 static void |
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190 ARTS_WaitDone(_THIS) |
0 | 191 { |
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192 /* !!! FIXME: camp here until buffer drains... SDL_Delay(???); */ |
0 | 193 } |
194 | |
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195 |
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196 static Uint8 * |
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197 ARTS_GetDeviceBuf(_THIS) |
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198 { |
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199 return (this->hidden->mixbuf); |
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200 } |
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201 |
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202 |
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203 static void |
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204 ARTS_CloseDevice(_THIS) |
0 | 205 { |
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206 if (this->hidden != NULL) { |
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207 if (this->hidden->mixbuf != NULL) { |
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208 SDL_FreeAudioMem(this->hidden->mixbuf); |
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209 this->hidden->mixbuf = NULL; |
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210 } |
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211 if (this->hidden->stream) { |
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212 SDL_NAME(arts_close_stream) (this->hidden->stream); |
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213 this->hidden->stream = 0; |
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214 } |
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215 SDL_NAME(arts_free) (); |
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216 SDL_free(this->hidden); |
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217 this->hidden = NULL; |
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218 } |
0 | 219 } |
220 | |
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221 |
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222 static int |
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223 ARTS_OpenDevice(_THIS, const char *devname, int iscapture) |
0 | 224 { |
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225 int rc = 0; |
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226 int bits = 0, frag_spec = 0; |
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227 SDL_AudioFormat test_format = 0, format = 0; |
0 | 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)); |
0 | 237 |
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238 /* Try for a closest match on audio format */ |
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239 for (test_format = SDL_FirstAudioFormat(this->spec.format); |
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240 !format && test_format;) { |
0 | 241 #ifdef DEBUG_AUDIO |
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242 fprintf(stderr, "Trying format 0x%4.4x\n", test_format); |
0 | 243 #endif |
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244 switch (test_format) { |
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245 case AUDIO_U8: |
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246 bits = 8; |
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247 format = 1; |
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248 break; |
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249 case AUDIO_S16LSB: |
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250 bits = 16; |
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251 format = 1; |
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252 break; |
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253 default: |
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254 format = 0; |
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255 break; |
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256 } |
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257 if (!format) { |
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258 test_format = SDL_NextAudioFormat(); |
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259 } |
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260 } |
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261 if (format == 0) { |
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262 ARTS_CloseDevice(this); |
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263 SDL_SetError("Couldn't find any hardware audio formats"); |
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264 return 0; |
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265 } |
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266 this->spec.format = test_format; |
0 | 267 |
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268 if ((rc = SDL_NAME(arts_init) ()) != 0) { |
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269 ARTS_CloseDevice(this); |
2060 | 270 SDL_SetError("Unable to initialize ARTS: %s", |
271 SDL_NAME(arts_error_text) (rc)); | |
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272 return 0; |
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273 } |
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274 |
2141 | 275 if (!SDL_NAME(arts_suspended) ()) { |
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276 ARTS_CloseDevice(this); |
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277 SDL_SetError("ARTS can not open audio device"); |
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278 return 0; |
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279 } |
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280 |
2060 | 281 this->hidden->stream = SDL_NAME(arts_play_stream) (this->spec.freq, |
282 bits, | |
283 this->spec.channels, | |
284 "SDL"); | |
0 | 285 |
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286 /* Play nothing so we have at least one write (server bug workaround). */ |
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287 SDL_NAME(arts_write) (this->hidden->stream, "", 0); |
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288 |
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289 /* Calculate the final parameters for this audio specification */ |
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290 SDL_CalculateAudioSpec(&this->spec); |
0 | 291 |
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292 /* Determine the power of two of the fragment size */ |
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293 for (frag_spec = 0; (0x01 << frag_spec) < this->spec.size; ++frag_spec); |
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294 if ((0x01 << frag_spec) != this->spec.size) { |
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295 ARTS_CloseDevice(this); |
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296 SDL_SetError("Fragment size must be a power of two"); |
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297 return 0; |
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298 } |
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299 frag_spec |= 0x00020000; /* two fragments, for low latency */ |
0 | 300 |
301 #ifdef ARTS_P_PACKET_SETTINGS | |
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302 SDL_NAME(arts_stream_set) (this->hidden->stream, |
2060 | 303 ARTS_P_PACKET_SETTINGS, frag_spec); |
0 | 304 #else |
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305 SDL_NAME(arts_stream_set) (this->hidden->stream, ARTS_P_PACKET_SIZE, |
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306 frag_spec & 0xffff); |
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307 SDL_NAME(arts_stream_set) (this->hidden->stream, ARTS_P_PACKET_COUNT, |
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308 frag_spec >> 16); |
0 | 309 #endif |
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310 this->spec.size = SDL_NAME(arts_stream_get) (this->hidden->stream, |
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311 ARTS_P_PACKET_SIZE); |
0 | 312 |
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313 /* Allocate mixing buffer */ |
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314 this->hidden->mixlen = this->spec.size; |
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315 this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen); |
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316 if (this->hidden->mixbuf == NULL) { |
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317 ARTS_CloseDevice(this); |
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318 SDL_OutOfMemory(); |
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319 return 0; |
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320 } |
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321 SDL_memset(this->hidden->mixbuf, this->spec.silence, this->spec.size); |
0 | 322 |
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323 /* Get the parent process id (we're the parent of the audio thread) */ |
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324 this->hidden->parent = getpid(); |
0 | 325 |
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326 /* We're ready to rock and roll. :-) */ |
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327 return 1; |
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328 } |
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329 |
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330 |
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331 static void |
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332 ARTS_Deinitialize(void) |
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333 { |
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334 UnloadARTSLibrary(); |
0 | 335 } |
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336 |
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337 |
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338 static int |
2060 | 339 ARTS_Init(SDL_AudioDriverImpl * impl) |
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340 { |
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341 if (LoadARTSLibrary() < 0) { |
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342 return 0; |
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343 } else { |
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344 if (SDL_NAME(arts_init) () != 0) { |
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345 UnloadARTSLibrary(); |
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346 SDL_SetError("ARTS: arts_init failed (no audio server?)"); |
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347 return 0; |
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348 } |
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349 |
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350 /* Play a stream so aRts doesn't crash */ |
2141 | 351 if (SDL_NAME(arts_suspended) ()) { |
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352 arts_stream_t stream; |
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353 stream = SDL_NAME(arts_play_stream) (44100, 16, 2, "SDL"); |
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354 SDL_NAME(arts_write) (stream, "", 0); |
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355 SDL_NAME(arts_close_stream) (stream); |
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356 } |
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357 |
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358 SDL_NAME(arts_free) (); |
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359 } |
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360 |
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361 /* Set the function pointers */ |
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362 impl->OpenDevice = ARTS_OpenDevice; |
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363 impl->PlayDevice = ARTS_PlayDevice; |
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364 impl->WaitDevice = ARTS_WaitDevice; |
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365 impl->GetDeviceBuf = ARTS_GetDeviceBuf; |
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366 impl->CloseDevice = ARTS_CloseDevice; |
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367 impl->WaitDone = ARTS_WaitDone; |
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368 impl->Deinitialize = ARTS_Deinitialize; |
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369 impl->OnlyHasDefaultOutputDevice = 1; |
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370 |
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371 return 1; /* this audio target is available. */ |
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372 } |
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373 |
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374 |
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375 AudioBootStrap ARTS_bootstrap = { |
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376 ARTS_DRIVER_NAME, "Analog RealTime Synthesizer", ARTS_Init, 0 |
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377 }; |
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378 |
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379 /* vi: set ts=4 sw=4 expandtab: */ |