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annotate src/audio/arts/SDL_artsaudio.c @ 2697:c9121b04cffa gsoc2008_nds

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Some more work on the audio driver.
author Darren Alton <dalton@stevens.edu>
date Thu, 21 Aug 2008 12:38:21 +0000
parents 31269eb74914
children 99210400e8b9
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 #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>
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30
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31 #include "SDL_timer.h"
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32 #include "SDL_audio.h"
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33 #include "../SDL_audiomem.h"
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34 #include "../SDL_audio_c.h"
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35 #include "SDL_artsaudio.h"
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36
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37 #ifdef SDL_AUDIO_DRIVER_ARTS_DYNAMIC
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38 #include "SDL_name.h"
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39 #include "SDL_loadso.h"
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40 #else
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41 #define SDL_NAME(X) X
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42 #endif
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43
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44 /* The tag name used by artsc audio */
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45 #define ARTS_DRIVER_NAME "arts"
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46
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47 #ifdef SDL_AUDIO_DRIVER_ARTS_DYNAMIC
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48
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49 static const char *arts_library = SDL_AUDIO_DRIVER_ARTS_DYNAMIC;
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50 static void *arts_handle = NULL;
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51
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52 /* !!! FIXME: I hate this SDL_NAME clutter...it makes everything so messy! */
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53 static int (*SDL_NAME(arts_init)) (void);
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54 static void (*SDL_NAME(arts_free)) (void);
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55 static arts_stream_t(*SDL_NAME(arts_play_stream)) (int rate, int bits,
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56 int channels,
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57 const char *name);
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58 static int (*SDL_NAME(arts_stream_set)) (arts_stream_t s,
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59 arts_parameter_t param, int value);
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60 static int (*SDL_NAME(arts_stream_get)) (arts_stream_t s,
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61 arts_parameter_t param);
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62 static int (*SDL_NAME(arts_write)) (arts_stream_t s, const void *buffer,
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63 int count);
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64 static void (*SDL_NAME(arts_close_stream)) (arts_stream_t s);
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65 static int (*SDL_NAME(arts_suspended)) (void);
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66 static const char *(*SDL_NAME(arts_error_text)) (int errorcode);
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67
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68 #define SDL_ARTS_SYM(x) { #x, (void **) (char *) &SDL_NAME(x) }
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69 static struct
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70 {
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71 const char *name;
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72 void **func;
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73 } arts_functions[] = {
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74 /* *INDENT-OFF* */
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75 SDL_ARTS_SYM(arts_init),
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76 SDL_ARTS_SYM(arts_free),
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77 SDL_ARTS_SYM(arts_play_stream),
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78 SDL_ARTS_SYM(arts_stream_set),
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79 SDL_ARTS_SYM(arts_stream_get),
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80 SDL_ARTS_SYM(arts_write),
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81 SDL_ARTS_SYM(arts_close_stream),
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82 SDL_ARTS_SYM(arts_suspended),
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83 SDL_ARTS_SYM(arts_error_text),
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84 /* *INDENT-ON* */
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85 };
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86
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87 #undef SDL_ARTS_SYM
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88
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89 static void
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90 UnloadARTSLibrary()
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91 {
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92 if (arts_handle != NULL) {
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93 SDL_UnloadObject(arts_handle);
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94 arts_handle = NULL;
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95 }
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96 }
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97
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98 static int
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99 LoadARTSLibrary(void)
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100 {
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101 int i, retval = -1;
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102
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103 if (arts_handle == NULL) {
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104 arts_handle = SDL_LoadObject(arts_library);
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105 if (arts_handle != NULL) {
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106 retval = 0;
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107 for (i = 0; i < SDL_arraysize(arts_functions); ++i) {
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108 *arts_functions[i].func =
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109 SDL_LoadFunction(arts_handle, arts_functions[i].name);
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110 if (!*arts_functions[i].func) {
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111 retval = -1;
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112 UnloadARTSLibrary();
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113 break;
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114 }
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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 return retval;
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120 }
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121
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122 #else
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123
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124 static void
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125 UnloadARTSLibrary()
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126 {
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127 return;
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128 }
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129
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130 static int
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131 LoadARTSLibrary(void)
294
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132 {
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133 return 0;
294
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134 }
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135
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19418e4422cb New configure-based build system. Still work in progress, but much improved
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136 #endif /* SDL_AUDIO_DRIVER_ARTS_DYNAMIC */
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137
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138 /* This function waits until it is possible to write a full sound buffer */
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139 static void
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140 ARTS_WaitDevice(_THIS)
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141 {
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142 Sint32 ticks;
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143
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144 /* Check to see if the thread-parent process is still alive */
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145 {
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146 static int cnt = 0;
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147 /* Note that this only works with thread implementations
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148 that use a different process id for each thread.
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149 */
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150 /* Check every 10 loops */
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diff changeset
151 if (this->hidden->parent && (((++cnt) % 10) == 0)) {
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152 if (kill(this->hidden->parent, 0) < 0) {
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153 this->enabled = 0;
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154 }
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155 }
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156 }
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157
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158 /* Use timer for general audio synchronization */
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159 ticks =
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160 ((Sint32) (this->hidden->next_frame - SDL_GetTicks())) - FUDGE_TICKS;
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161 if (ticks > 0) {
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162 SDL_Delay(ticks);
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163 }
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164 }
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165
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166 static void
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167 ARTS_PlayDevice(_THIS)
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168 {
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169 /* Write the audio data */
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170 int written = SDL_NAME(arts_write) (this->hidden->stream,
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171 this->hidden->mixbuf,
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172 this->hidden->mixlen);
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173
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174 /* If timer synchronization is enabled, set the next write frame */
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175 if (this->hidden->frame_ticks) {
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176 this->hidden->next_frame += this->hidden->frame_ticks;
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177 }
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178
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179 /* If we couldn't write, assume fatal error for now */
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180 if (written < 0) {
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181 this->enabled = 0;
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182 }
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183 #ifdef DEBUG_AUDIO
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184 fprintf(stderr, "Wrote %d bytes of audio data\n", written);
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185 #endif
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186 }
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187
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188 static void
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189 ARTS_WaitDone(_THIS)
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190 {
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191 /* !!! FIXME: camp here until buffer drains... SDL_Delay(???); */
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192 }
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193
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194
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diff changeset
195 static Uint8 *
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diff changeset
196 ARTS_GetDeviceBuf(_THIS)
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diff changeset
197 {
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diff changeset
198 return (this->hidden->mixbuf);
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199 }
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diff changeset
200
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diff changeset
201
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202 static void
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203 ARTS_CloseDevice(_THIS)
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204 {
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diff changeset
205 if (this->hidden != NULL) {
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diff changeset
206 if (this->hidden->mixbuf != NULL) {
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parents: 1982
diff changeset
207 SDL_FreeAudioMem(this->hidden->mixbuf);
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diff changeset
208 this->hidden->mixbuf = NULL;
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diff changeset
209 }
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diff changeset
210 if (this->hidden->stream) {
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parents: 1982
diff changeset
211 SDL_NAME(arts_close_stream) (this->hidden->stream);
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parents: 1982
diff changeset
212 this->hidden->stream = 0;
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diff changeset
213 }
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diff changeset
214 SDL_NAME(arts_free) ();
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parents: 1982
diff changeset
215 SDL_free(this->hidden);
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diff changeset
216 this->hidden = NULL;
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217 }
0
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218 }
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diff changeset
219
2049
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diff changeset
220
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diff changeset
221 static int
2049
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diff changeset
222 ARTS_OpenDevice(_THIS, const char *devname, int iscapture)
0
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diff changeset
223 {
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diff changeset
224 int rc = 0;
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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parents: 1982
diff changeset
225 int bits = 0, frag_spec = 0;
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diff changeset
226 SDL_AudioFormat test_format = 0, format = 0;
0
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227
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diff changeset
228 /* Initialize all variables that we clean on shutdown */
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diff changeset
229 this->hidden = (struct SDL_PrivateAudioData *)
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230 SDL_malloc((sizeof *this->hidden));
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diff changeset
231 if (this->hidden == NULL) {
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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parents: 1982
diff changeset
232 SDL_OutOfMemory();
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diff changeset
233 return 0;
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diff changeset
234 }
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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diff changeset
235 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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236
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diff changeset
237 /* Try for a closest match on audio format */
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diff changeset
238 for (test_format = SDL_FirstAudioFormat(this->spec.format);
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239 !format && test_format;) {
0
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diff changeset
240 #ifdef DEBUG_AUDIO
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241 fprintf(stderr, "Trying format 0x%4.4x\n", test_format);
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242 #endif
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diff changeset
243 switch (test_format) {
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244 case AUDIO_U8:
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245 bits = 8;
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diff changeset
246 format = 1;
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diff changeset
247 break;
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diff changeset
248 case AUDIO_S16LSB:
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diff changeset
249 bits = 16;
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diff changeset
250 format = 1;
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diff changeset
251 break;
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diff changeset
252 default:
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diff changeset
253 format = 0;
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diff changeset
254 break;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
255 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
256 if (!format) {
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diff changeset
257 test_format = SDL_NextAudioFormat();
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258 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
259 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
260 if (format == 0) {
2049
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diff changeset
261 ARTS_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 this->spec.format = test_format;
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266
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267 if ((rc = SDL_NAME(arts_init) ()) != 0) {
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268 ARTS_CloseDevice(this);
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269 SDL_SetError("Unable to initialize ARTS: %s",
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270 SDL_NAME(arts_error_text) (rc));
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271 return 0;
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272 }
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273
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274 if (!SDL_NAME(arts_suspended) ()) {
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275 ARTS_CloseDevice(this);
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276 SDL_SetError("ARTS can not open audio device");
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277 return 0;
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278 }
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279
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280 this->hidden->stream = SDL_NAME(arts_play_stream) (this->spec.freq,
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281 bits,
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282 this->spec.channels,
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283 "SDL");
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284
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285 /* Play nothing so we have at least one write (server bug workaround). */
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286 SDL_NAME(arts_write) (this->hidden->stream, "", 0);
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287
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288 /* Calculate the final parameters for this audio specification */
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289 SDL_CalculateAudioSpec(&this->spec);
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290
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291 /* Determine the power of two of the fragment size */
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292 for (frag_spec = 0; (0x01 << frag_spec) < this->spec.size; ++frag_spec);
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293 if ((0x01 << frag_spec) != this->spec.size) {
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294 ARTS_CloseDevice(this);
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295 SDL_SetError("Fragment size must be a power of two");
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296 return 0;
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297 }
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298 frag_spec |= 0x00020000; /* two fragments, for low latency */
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299
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300 #ifdef ARTS_P_PACKET_SETTINGS
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diff changeset
301 SDL_NAME(arts_stream_set) (this->hidden->stream,
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302 ARTS_P_PACKET_SETTINGS, frag_spec);
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303 #else
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304 SDL_NAME(arts_stream_set) (this->hidden->stream, ARTS_P_PACKET_SIZE,
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305 frag_spec & 0xffff);
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diff changeset
306 SDL_NAME(arts_stream_set) (this->hidden->stream, ARTS_P_PACKET_COUNT,
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diff changeset
307 frag_spec >> 16);
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308 #endif
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309 this->spec.size = SDL_NAME(arts_stream_get) (this->hidden->stream,
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diff changeset
310 ARTS_P_PACKET_SIZE);
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311
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312 /* Allocate mixing buffer */
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diff changeset
313 this->hidden->mixlen = this->spec.size;
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diff changeset
314 this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen);
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diff changeset
315 if (this->hidden->mixbuf == NULL) {
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diff changeset
316 ARTS_CloseDevice(this);
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diff changeset
317 SDL_OutOfMemory();
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diff changeset
318 return 0;
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319 }
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diff changeset
320 SDL_memset(this->hidden->mixbuf, this->spec.silence, this->spec.size);
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321
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322 /* Get the parent process id (we're the parent of the audio thread) */
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diff changeset
323 this->hidden->parent = getpid();
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324
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325 /* We're ready to rock and roll. :-) */
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326 return 1;
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327 }
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328
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diff changeset
329
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diff changeset
330 static void
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diff changeset
331 ARTS_Deinitialize(void)
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diff changeset
332 {
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diff changeset
333 UnloadARTSLibrary();
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334 }
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335
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diff changeset
336
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diff changeset
337 static int
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diff changeset
338 ARTS_Init(SDL_AudioDriverImpl * impl)
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339 {
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diff changeset
340 if (LoadARTSLibrary() < 0) {
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341 return 0;
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diff changeset
342 } else {
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diff changeset
343 if (SDL_NAME(arts_init) () != 0) {
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diff changeset
344 UnloadARTSLibrary();
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diff changeset
345 SDL_SetError("ARTS: arts_init failed (no audio server?)");
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diff changeset
346 return 0;
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diff changeset
347 }
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diff changeset
348
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diff changeset
349 /* Play a stream so aRts doesn't crash */
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350 if (SDL_NAME(arts_suspended) ()) {
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diff changeset
351 arts_stream_t stream;
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diff changeset
352 stream = SDL_NAME(arts_play_stream) (44100, 16, 2, "SDL");
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diff changeset
353 SDL_NAME(arts_write) (stream, "", 0);
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diff changeset
354 SDL_NAME(arts_close_stream) (stream);
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diff changeset
355 }
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diff changeset
356
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diff changeset
357 SDL_NAME(arts_free) ();
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diff changeset
358 }
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diff changeset
359
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diff changeset
360 /* Set the function pointers */
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diff changeset
361 impl->OpenDevice = ARTS_OpenDevice;
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diff changeset
362 impl->PlayDevice = ARTS_PlayDevice;
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diff changeset
363 impl->WaitDevice = ARTS_WaitDevice;
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diff changeset
364 impl->GetDeviceBuf = ARTS_GetDeviceBuf;
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diff changeset
365 impl->CloseDevice = ARTS_CloseDevice;
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diff changeset
366 impl->WaitDone = ARTS_WaitDone;
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diff changeset
367 impl->Deinitialize = ARTS_Deinitialize;
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diff changeset
368 impl->OnlyHasDefaultOutputDevice = 1;
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diff changeset
369
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diff changeset
370 return 1;
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diff changeset
371 }
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diff changeset
372
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373
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diff changeset
374 AudioBootStrap ARTS_bootstrap = {
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diff changeset
375 ARTS_DRIVER_NAME, "Analog RealTime Synthesizer", ARTS_Init, 0
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diff changeset
376 };
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377
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378 /* vi: set ts=4 sw=4 expandtab: */