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annotate src/audio/arts/SDL_artsaudio.c @ 2144:665c2669e6a3

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Merged r3138:3139 from branches/SDL-1.2: Don't init audio callback buffer. (This already had a concession for devices opened via the 1.2 entry points, I've changed it to respect the environment variable and do it for all devices now.)
author Ryan C. Gordon <icculus@icculus.org>
date Thu, 05 Jul 2007 02:30:10 +0000
parents e1a70460c354
children 31269eb74914
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 a raw mixing buffer */
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25
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26 #include "SDL_timer.h"
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27 #include "SDL_audio.h"
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28 #include "../SDL_audiomem.h"
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29 #include "../SDL_audio_c.h"
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30 #include "SDL_artsaudio.h"
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31
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32 #ifdef SDL_AUDIO_DRIVER_ARTS_DYNAMIC
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33 #include "SDL_name.h"
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34 #include "SDL_loadso.h"
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35 #else
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36 #define SDL_NAME(X) X
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37 #endif
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38
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39 /* The tag name used by artsc audio */
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40 #define ARTS_DRIVER_NAME "arts"
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41
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42 #ifdef SDL_AUDIO_DRIVER_ARTS_DYNAMIC
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43
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44 static const char *arts_library = SDL_AUDIO_DRIVER_ARTS_DYNAMIC;
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45 static void *arts_handle = NULL;
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46
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47 /* !!! FIXME: I hate this SDL_NAME clutter...it makes everything so messy! */
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48 static int (*SDL_NAME(arts_init)) (void);
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49 static void (*SDL_NAME(arts_free)) (void);
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50 static arts_stream_t(*SDL_NAME(arts_play_stream)) (int rate, int bits,
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51 int channels,
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52 const char *name);
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53 static int (*SDL_NAME(arts_stream_set)) (arts_stream_t s,
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54 arts_parameter_t param, int value);
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55 static int (*SDL_NAME(arts_stream_get)) (arts_stream_t s,
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56 arts_parameter_t param);
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57 static int (*SDL_NAME(arts_write)) (arts_stream_t s, const void *buffer,
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58 int count);
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59 static void (*SDL_NAME(arts_close_stream)) (arts_stream_t s);
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60 static int (*SDL_NAME(arts_suspended)) (void);
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61 static const char *(*SDL_NAME(arts_error_text)) (int errorcode);
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62
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63 #define SDL_ARTS_SYM(x) { #x, (void **) (char *) &SDL_NAME(x) }
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64 static struct
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65 {
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66 const char *name;
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67 void **func;
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68 } arts_functions[] = {
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69 /* *INDENT-OFF* */
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70 SDL_ARTS_SYM(arts_init),
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71 SDL_ARTS_SYM(arts_free),
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72 SDL_ARTS_SYM(arts_play_stream),
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73 SDL_ARTS_SYM(arts_stream_set),
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74 SDL_ARTS_SYM(arts_stream_get),
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75 SDL_ARTS_SYM(arts_write),
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76 SDL_ARTS_SYM(arts_close_stream),
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77 SDL_ARTS_SYM(arts_suspended),
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78 SDL_ARTS_SYM(arts_error_text),
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79 /* *INDENT-ON* */
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80 };
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81
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82 #undef SDL_ARTS_SYM
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83
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84 static void
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85 UnloadARTSLibrary()
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86 {
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87 if (arts_handle != NULL) {
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88 SDL_UnloadObject(arts_handle);
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89 arts_handle = NULL;
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90 }
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91 }
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92
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93 static int
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94 LoadARTSLibrary(void)
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95 {
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96 int i, retval = -1;
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97
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98 if (arts_handle == NULL) {
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99 arts_handle = SDL_LoadObject(arts_library);
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100 if (arts_handle != NULL) {
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101 retval = 0;
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102 for (i = 0; i < SDL_arraysize(arts_functions); ++i) {
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103 *arts_functions[i].func =
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104 SDL_LoadFunction(arts_handle, arts_functions[i].name);
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105 if (!*arts_functions[i].func) {
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106 retval = -1;
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107 UnloadARTSLibrary();
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108 break;
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109 }
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110 }
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111 }
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112 }
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113
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114 return retval;
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115 }
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116
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117 #else
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118
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119 static void
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120 UnloadARTSLibrary()
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121 {
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122 return;
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123 }
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124
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125 static int
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126 LoadARTSLibrary(void)
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127 {
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128 return 0;
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129 }
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130
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131 #endif /* SDL_AUDIO_DRIVER_ARTS_DYNAMIC */
294
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132
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133 /* This function waits until it is possible to write a full sound buffer */
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134 static void
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135 ARTS_WaitDevice(_THIS)
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136 {
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137 Sint32 ticks;
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138
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139 /* Check to see if the thread-parent process is still alive */
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140 {
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141 static int cnt = 0;
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142 /* Note that this only works with thread implementations
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143 that use a different process id for each thread.
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144 */
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145 /* Check every 10 loops */
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diff changeset
146 if (this->hidden->parent && (((++cnt) % 10) == 0)) {
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147 if (kill(this->hidden->parent, 0) < 0) {
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148 this->enabled = 0;
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149 }
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150 }
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151 }
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152
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153 /* Use timer for general audio synchronization */
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154 ticks =
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155 ((Sint32) (this->hidden->next_frame - SDL_GetTicks())) - FUDGE_TICKS;
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156 if (ticks > 0) {
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157 SDL_Delay(ticks);
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158 }
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159 }
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160
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161 static void
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162 ARTS_PlayDevice(_THIS)
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163 {
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164 /* Write the audio data */
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165 int written = SDL_NAME(arts_write) (this->hidden->stream,
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166 this->hidden->mixbuf,
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167 this->hidden->mixlen);
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168
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169 /* If timer synchronization is enabled, set the next write frame */
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170 if (this->hidden->frame_ticks) {
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171 this->hidden->next_frame += this->hidden->frame_ticks;
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172 }
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173
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174 /* If we couldn't write, assume fatal error for now */
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175 if (written < 0) {
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176 this->enabled = 0;
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177 }
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178 #ifdef DEBUG_AUDIO
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179 fprintf(stderr, "Wrote %d bytes of audio data\n", written);
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180 #endif
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181 }
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182
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diff changeset
183 static void
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184 ARTS_WaitDone(_THIS)
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185 {
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186 /* !!! FIXME: camp here until buffer drains... SDL_Delay(???); */
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187 }
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188
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189
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diff changeset
190 static Uint8 *
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diff changeset
191 ARTS_GetDeviceBuf(_THIS)
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192 {
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diff changeset
193 return (this->hidden->mixbuf);
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194 }
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195
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196
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197 static void
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198 ARTS_CloseDevice(_THIS)
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199 {
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200 if (this->hidden != NULL) {
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201 if (this->hidden->mixbuf != NULL) {
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diff changeset
202 SDL_FreeAudioMem(this->hidden->mixbuf);
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diff changeset
203 this->hidden->mixbuf = NULL;
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204 }
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diff changeset
205 if (this->hidden->stream) {
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diff changeset
206 SDL_NAME(arts_close_stream) (this->hidden->stream);
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diff changeset
207 this->hidden->stream = 0;
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208 }
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diff changeset
209 SDL_NAME(arts_free) ();
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diff changeset
210 SDL_free(this->hidden);
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diff changeset
211 this->hidden = NULL;
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212 }
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213 }
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214
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diff changeset
215
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216 static int
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217 ARTS_OpenDevice(_THIS, const char *devname, int iscapture)
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218 {
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diff changeset
219 int rc = 0;
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diff changeset
220 int bits = 0, frag_spec = 0;
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diff changeset
221 SDL_AudioFormat test_format = 0, format = 0;
0
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222
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diff changeset
223 /* Initialize all variables that we clean on shutdown */
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diff changeset
224 this->hidden = (struct SDL_PrivateAudioData *)
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225 SDL_malloc((sizeof *this->hidden));
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diff changeset
226 if (this->hidden == NULL) {
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diff changeset
227 SDL_OutOfMemory();
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diff changeset
228 return 0;
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229 }
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230 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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231
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232 /* Try for a closest match on audio format */
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diff changeset
233 for (test_format = SDL_FirstAudioFormat(this->spec.format);
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234 !format && test_format;) {
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235 #ifdef DEBUG_AUDIO
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236 fprintf(stderr, "Trying format 0x%4.4x\n", test_format);
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237 #endif
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238 switch (test_format) {
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239 case AUDIO_U8:
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240 bits = 8;
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241 format = 1;
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diff changeset
242 break;
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diff changeset
243 case AUDIO_S16LSB:
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diff changeset
244 bits = 16;
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245 format = 1;
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diff changeset
246 break;
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diff changeset
247 default:
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diff changeset
248 format = 0;
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diff changeset
249 break;
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diff changeset
250 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
251 if (!format) {
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diff changeset
252 test_format = SDL_NextAudioFormat();
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253 }
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diff changeset
254 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
255 if (format == 0) {
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diff changeset
256 ARTS_CloseDevice(this);
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diff changeset
257 SDL_SetError("Couldn't find any hardware audio formats");
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diff changeset
258 return 0;
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diff changeset
259 }
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diff changeset
260 this->spec.format = test_format;
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261
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262 if ((rc = SDL_NAME(arts_init) ()) != 0) {
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263 ARTS_CloseDevice(this);
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264 SDL_SetError("Unable to initialize ARTS: %s",
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265 SDL_NAME(arts_error_text) (rc));
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266 return 0;
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267 }
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268
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269 if (!SDL_NAME(arts_suspended) ()) {
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270 ARTS_CloseDevice(this);
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271 SDL_SetError("ARTS can not open audio device");
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272 return 0;
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273 }
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274
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275 this->hidden->stream = SDL_NAME(arts_play_stream) (this->spec.freq,
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276 bits,
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277 this->spec.channels,
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278 "SDL");
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279
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280 /* Play nothing so we have at least one write (server bug workaround). */
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281 SDL_NAME(arts_write) (this->hidden->stream, "", 0);
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282
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283 /* Calculate the final parameters for this audio specification */
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284 SDL_CalculateAudioSpec(&this->spec);
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285
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286 /* Determine the power of two of the fragment size */
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287 for (frag_spec = 0; (0x01 << frag_spec) < this->spec.size; ++frag_spec);
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288 if ((0x01 << frag_spec) != this->spec.size) {
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289 ARTS_CloseDevice(this);
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290 SDL_SetError("Fragment size must be a power of two");
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291 return 0;
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292 }
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293 frag_spec |= 0x00020000; /* two fragments, for low latency */
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294
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295 #ifdef ARTS_P_PACKET_SETTINGS
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296 SDL_NAME(arts_stream_set) (this->hidden->stream,
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297 ARTS_P_PACKET_SETTINGS, frag_spec);
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298 #else
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299 SDL_NAME(arts_stream_set) (this->hidden->stream, ARTS_P_PACKET_SIZE,
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300 frag_spec & 0xffff);
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301 SDL_NAME(arts_stream_set) (this->hidden->stream, ARTS_P_PACKET_COUNT,
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302 frag_spec >> 16);
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303 #endif
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304 this->spec.size = SDL_NAME(arts_stream_get) (this->hidden->stream,
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305 ARTS_P_PACKET_SIZE);
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306
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307 /* Allocate mixing buffer */
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308 this->hidden->mixlen = this->spec.size;
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309 this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen);
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310 if (this->hidden->mixbuf == NULL) {
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311 ARTS_CloseDevice(this);
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diff changeset
312 SDL_OutOfMemory();
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313 return 0;
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314 }
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315 SDL_memset(this->hidden->mixbuf, this->spec.silence, this->spec.size);
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316
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317 /* Get the parent process id (we're the parent of the audio thread) */
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318 this->hidden->parent = getpid();
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319
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320 /* We're ready to rock and roll. :-) */
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321 return 1;
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322 }
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323
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324
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325 static void
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diff changeset
326 ARTS_Deinitialize(void)
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327 {
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328 UnloadARTSLibrary();
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329 }
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330
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331
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332 static int
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333 ARTS_Init(SDL_AudioDriverImpl * impl)
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334 {
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335 if (LoadARTSLibrary() < 0) {
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336 return 0;
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337 } else {
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diff changeset
338 if (SDL_NAME(arts_init) () != 0) {
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339 UnloadARTSLibrary();
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340 SDL_SetError("ARTS: arts_init failed (no audio server?)");
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341 return 0;
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342 }
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343
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344 /* Play a stream so aRts doesn't crash */
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345 if (SDL_NAME(arts_suspended) ()) {
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346 arts_stream_t stream;
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347 stream = SDL_NAME(arts_play_stream) (44100, 16, 2, "SDL");
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348 SDL_NAME(arts_write) (stream, "", 0);
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349 SDL_NAME(arts_close_stream) (stream);
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350 }
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351
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352 SDL_NAME(arts_free) ();
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353 }
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354
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diff changeset
355 /* Set the function pointers */
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diff changeset
356 impl->OpenDevice = ARTS_OpenDevice;
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357 impl->PlayDevice = ARTS_PlayDevice;
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diff changeset
358 impl->WaitDevice = ARTS_WaitDevice;
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diff changeset
359 impl->GetDeviceBuf = ARTS_GetDeviceBuf;
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360 impl->CloseDevice = ARTS_CloseDevice;
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361 impl->WaitDone = ARTS_WaitDone;
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362 impl->Deinitialize = ARTS_Deinitialize;
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diff changeset
363 impl->OnlyHasDefaultOutputDevice = 1;
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364
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365 return 1;
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366 }
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367
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368
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diff changeset
369 AudioBootStrap ARTS_bootstrap = {
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diff changeset
370 ARTS_DRIVER_NAME, "Analog RealTime Synthesizer", ARTS_Init, 0
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371 };
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372
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373 /* vi: set ts=4 sw=4 expandtab: */