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annotate src/audio/arts/SDL_artsaudio.c @ 2121:85ed90a755fa

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Reworked r3067:3068 from branches/SDL-1.2: arts unavailable hardware bug fix.
author Ryan C. Gordon <icculus@icculus.org>
date Thu, 14 Jun 2007 14:22:54 +0000
parents 866052b01ee5
children e1a70460c354
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 SDL_ARTS_SYM(arts_init),
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70 SDL_ARTS_SYM(arts_free),
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71 SDL_ARTS_SYM(arts_play_stream),
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72 SDL_ARTS_SYM(arts_stream_set),
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73 SDL_ARTS_SYM(arts_stream_get),
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74 SDL_ARTS_SYM(arts_write),
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75 SDL_ARTS_SYM(arts_close_stream),
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76 SDL_ARTS_SYM(arts_suspended),
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77 SDL_ARTS_SYM(arts_error_text),
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78 };
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79 #undef SDL_ARTS_SYM
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80
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81 static void
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82 UnloadARTSLibrary()
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83 {
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84 if (arts_handle != NULL) {
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85 SDL_UnloadObject(arts_handle);
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86 arts_handle = NULL;
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87 }
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88 }
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89
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90 static int
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91 LoadARTSLibrary(void)
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92 {
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93 int i, retval = -1;
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94
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95 if (arts_handle == NULL) {
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96 arts_handle = SDL_LoadObject(arts_library);
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97 if (arts_handle != NULL) {
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98 retval = 0;
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99 for (i = 0; i < SDL_arraysize(arts_functions); ++i) {
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100 *arts_functions[i].func =
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101 SDL_LoadFunction(arts_handle, arts_functions[i].name);
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102 if (!*arts_functions[i].func) {
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103 retval = -1;
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104 UnloadARTSLibrary();
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105 break;
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106 }
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107 }
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108 }
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109 }
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110
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111 return retval;
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112 }
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113
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114 #else
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115
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116 static void
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117 UnloadARTSLibrary()
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118 {
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119 return;
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120 }
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121
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122 static int
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123 LoadARTSLibrary(void)
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124 {
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125 return 0;
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126 }
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127
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128 #endif /* SDL_AUDIO_DRIVER_ARTS_DYNAMIC */
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129
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130 /* This function waits until it is possible to write a full sound buffer */
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131 static void
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132 ARTS_WaitDevice(_THIS)
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133 {
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134 Sint32 ticks;
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135
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136 /* Check to see if the thread-parent process is still alive */
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137 {
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138 static int cnt = 0;
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139 /* Note that this only works with thread implementations
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140 that use a different process id for each thread.
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141 */
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142 /* Check every 10 loops */
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143 if (this->hidden->parent && (((++cnt) % 10) == 0)) {
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144 if (kill(this->hidden->parent, 0) < 0) {
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145 this->enabled = 0;
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146 }
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147 }
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148 }
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149
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150 /* Use timer for general audio synchronization */
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151 ticks =
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152 ((Sint32) (this->hidden->next_frame - SDL_GetTicks())) - FUDGE_TICKS;
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153 if (ticks > 0) {
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154 SDL_Delay(ticks);
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155 }
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156 }
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157
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158 static void
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159 ARTS_PlayDevice(_THIS)
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160 {
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161 /* Write the audio data */
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162 int written = SDL_NAME(arts_write) (this->hidden->stream,
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163 this->hidden->mixbuf,
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164 this->hidden->mixlen);
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165
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166 /* If timer synchronization is enabled, set the next write frame */
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167 if (this->hidden->frame_ticks) {
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168 this->hidden->next_frame += this->hidden->frame_ticks;
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169 }
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170
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171 /* If we couldn't write, assume fatal error for now */
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172 if (written < 0) {
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173 this->enabled = 0;
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174 }
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175 #ifdef DEBUG_AUDIO
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176 fprintf(stderr, "Wrote %d bytes of audio data\n", written);
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177 #endif
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178 }
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179
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180 static void
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181 ARTS_WaitDone(_THIS)
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182 {
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183 /* !!! FIXME: camp here until buffer drains... SDL_Delay(???); */
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184 }
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185
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186
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187 static Uint8 *
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188 ARTS_GetDeviceBuf(_THIS)
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189 {
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diff changeset
190 return (this->hidden->mixbuf);
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191 }
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192
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193
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194 static void
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195 ARTS_CloseDevice(_THIS)
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196 {
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197 if (this->hidden != NULL) {
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198 if (this->hidden->mixbuf != NULL) {
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199 SDL_FreeAudioMem(this->hidden->mixbuf);
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200 this->hidden->mixbuf = NULL;
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201 }
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202 if (this->hidden->stream) {
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203 SDL_NAME(arts_close_stream) (this->hidden->stream);
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204 this->hidden->stream = 0;
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205 }
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206 SDL_NAME(arts_free) ();
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207 SDL_free(this->hidden);
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208 this->hidden = NULL;
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209 }
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210 }
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211
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diff changeset
212
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213 static int
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214 ARTS_OpenDevice(_THIS, const char *devname, int iscapture)
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215 {
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diff changeset
216 int rc = 0;
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diff changeset
217 int bits = 0, frag_spec = 0;
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218 SDL_AudioFormat test_format = 0, format = 0;
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219
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diff changeset
220 /* Initialize all variables that we clean on shutdown */
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221 this->hidden = (struct SDL_PrivateAudioData *)
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222 SDL_malloc((sizeof *this->hidden));
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223 if (this->hidden == NULL) {
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224 SDL_OutOfMemory();
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225 return 0;
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226 }
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227 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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228
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229 /* Try for a closest match on audio format */
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230 for (test_format = SDL_FirstAudioFormat(this->spec.format);
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231 !format && test_format;) {
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232 #ifdef DEBUG_AUDIO
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233 fprintf(stderr, "Trying format 0x%4.4x\n", test_format);
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234 #endif
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235 switch (test_format) {
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236 case AUDIO_U8:
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237 bits = 8;
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238 format = 1;
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239 break;
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240 case AUDIO_S16LSB:
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241 bits = 16;
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242 format = 1;
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243 break;
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diff changeset
244 default:
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245 format = 0;
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246 break;
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247 }
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248 if (!format) {
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249 test_format = SDL_NextAudioFormat();
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250 }
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251 }
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252 if (format == 0) {
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diff changeset
253 ARTS_CloseDevice(this);
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254 SDL_SetError("Couldn't find any hardware audio formats");
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255 return 0;
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diff changeset
256 }
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diff changeset
257 this->spec.format = test_format;
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258
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diff changeset
259 if ((rc = SDL_NAME(arts_init) ()) != 0) {
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260 ARTS_CloseDevice(this);
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261 SDL_SetError("Unable to initialize ARTS: %s",
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262 SDL_NAME(arts_error_text) (rc));
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263 return 0;
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264 }
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265
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266 if ( ! SDL_NAME(arts_suspended)() ) {
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267 ARTS_CloseDevice(this);
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268 SDL_SetError("ARTS can not open audio device");
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269 return 0;
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270 }
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271
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272 this->hidden->stream = SDL_NAME(arts_play_stream) (this->spec.freq,
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273 bits,
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274 this->spec.channels,
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275 "SDL");
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276
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277 /* Play nothing so we have at least one write (server bug workaround). */
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278 SDL_NAME(arts_write) (this->hidden->stream, "", 0);
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279
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280 /* Calculate the final parameters for this audio specification */
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281 SDL_CalculateAudioSpec(&this->spec);
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282
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283 /* Determine the power of two of the fragment size */
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284 for (frag_spec = 0; (0x01 << frag_spec) < this->spec.size; ++frag_spec);
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285 if ((0x01 << frag_spec) != this->spec.size) {
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286 ARTS_CloseDevice(this);
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287 SDL_SetError("Fragment size must be a power of two");
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288 return 0;
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289 }
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290 frag_spec |= 0x00020000; /* two fragments, for low latency */
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291
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292 #ifdef ARTS_P_PACKET_SETTINGS
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293 SDL_NAME(arts_stream_set) (this->hidden->stream,
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294 ARTS_P_PACKET_SETTINGS, frag_spec);
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295 #else
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296 SDL_NAME(arts_stream_set) (this->hidden->stream, ARTS_P_PACKET_SIZE,
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297 frag_spec & 0xffff);
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298 SDL_NAME(arts_stream_set) (this->hidden->stream, ARTS_P_PACKET_COUNT,
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299 frag_spec >> 16);
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300 #endif
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301 this->spec.size = SDL_NAME(arts_stream_get) (this->hidden->stream,
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302 ARTS_P_PACKET_SIZE);
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303
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304 /* Allocate mixing buffer */
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305 this->hidden->mixlen = this->spec.size;
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306 this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen);
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diff changeset
307 if (this->hidden->mixbuf == NULL) {
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diff changeset
308 ARTS_CloseDevice(this);
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diff changeset
309 SDL_OutOfMemory();
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310 return 0;
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311 }
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312 SDL_memset(this->hidden->mixbuf, this->spec.silence, this->spec.size);
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313
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314 /* Get the parent process id (we're the parent of the audio thread) */
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315 this->hidden->parent = getpid();
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316
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317 /* We're ready to rock and roll. :-) */
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318 return 1;
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319 }
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320
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321
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322 static void
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323 ARTS_Deinitialize(void)
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324 {
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325 UnloadARTSLibrary();
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326 }
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327
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328
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329 static int
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330 ARTS_Init(SDL_AudioDriverImpl * impl)
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331 {
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diff changeset
332 if (LoadARTSLibrary() < 0) {
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333 return 0;
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334 } else {
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335 if (SDL_NAME(arts_init) () != 0) {
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336 UnloadARTSLibrary();
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diff changeset
337 SDL_SetError("ARTS: arts_init failed (no audio server?)");
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338 return 0;
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diff changeset
339 }
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diff changeset
340
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diff changeset
341 /* Play a stream so aRts doesn't crash */
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342 if ( SDL_NAME(arts_suspended)() ) {
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343 arts_stream_t stream;
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344 stream = SDL_NAME(arts_play_stream) (44100, 16, 2, "SDL");
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345 SDL_NAME(arts_write) (stream, "", 0);
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346 SDL_NAME(arts_close_stream) (stream);
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diff changeset
347 }
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348
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diff changeset
349 SDL_NAME(arts_free) ();
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350 }
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351
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diff changeset
352 /* Set the function pointers */
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diff changeset
353 impl->OpenDevice = ARTS_OpenDevice;
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354 impl->PlayDevice = ARTS_PlayDevice;
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355 impl->WaitDevice = ARTS_WaitDevice;
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diff changeset
356 impl->GetDeviceBuf = ARTS_GetDeviceBuf;
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357 impl->CloseDevice = ARTS_CloseDevice;
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358 impl->WaitDone = ARTS_WaitDone;
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diff changeset
359 impl->Deinitialize = ARTS_Deinitialize;
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diff changeset
360 impl->OnlyHasDefaultOutputDevice = 1;
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361
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362 return 1;
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363 }
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364
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365
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diff changeset
366 AudioBootStrap ARTS_bootstrap = {
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diff changeset
367 ARTS_DRIVER_NAME, "Analog RealTime Synthesizer", ARTS_Init, 0
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368 };
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369
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370 /* vi: set ts=4 sw=4 expandtab: */