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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.h" |
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27 #include "SDL_audio_c.h" |
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28 #include "SDL_audiomem.h" |
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29 #include "SDL_sysaudio.h" |
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30 |
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31 #ifdef __OS2__ |
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32 /* We'll need the DosSetPriority() API! */ |
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33 #define INCL_DOSPROCESS |
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34 #include <os2.h> |
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35 #endif |
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36 |
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37 /* Available audio drivers */ |
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38 static AudioBootStrap *bootstrap[] = { |
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39 #if SDL_AUDIO_DRIVER_BSD |
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40 &BSD_AUDIO_bootstrap, |
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41 #endif |
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42 #if SDL_AUDIO_DRIVER_OSS |
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43 &DSP_bootstrap, |
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44 &DMA_bootstrap, |
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45 #endif |
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46 #if SDL_AUDIO_DRIVER_ALSA |
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47 &ALSA_bootstrap, |
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48 #endif |
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49 #if SDL_AUDIO_DRIVER_PULSE |
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50 &PULSE_bootstrap, |
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51 #endif |
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52 #if SDL_AUDIO_DRIVER_QNXNTO |
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53 &QNXNTOAUDIO_bootstrap, |
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54 #endif |
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55 #if SDL_AUDIO_DRIVER_SUNAUDIO |
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56 &SUNAUDIO_bootstrap, |
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57 #endif |
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58 #if SDL_AUDIO_DRIVER_DMEDIA |
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59 &DMEDIA_bootstrap, |
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60 #endif |
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61 #if SDL_AUDIO_DRIVER_ARTS |
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62 &ARTS_bootstrap, |
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63 #endif |
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64 #if SDL_AUDIO_DRIVER_ESD |
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65 &ESD_bootstrap, |
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66 #endif |
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67 #if SDL_AUDIO_DRIVER_NAS |
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68 &NAS_bootstrap, |
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69 #endif |
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70 #if SDL_AUDIO_DRIVER_DSOUND |
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71 &DSOUND_bootstrap, |
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72 #endif |
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73 #if SDL_AUDIO_DRIVER_WAVEOUT |
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74 &WAVEOUT_bootstrap, |
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75 #endif |
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76 #if SDL_AUDIO_DRIVER_PAUD |
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77 &Paud_bootstrap, |
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78 #endif |
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79 #if SDL_AUDIO_DRIVER_BAUDIO |
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80 &BAUDIO_bootstrap, |
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81 #endif |
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82 #if SDL_AUDIO_DRIVER_COREAUDIO |
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83 &COREAUDIO_bootstrap, |
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84 #endif |
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85 #if SDL_AUDIO_DRIVER_SNDMGR |
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86 &SNDMGR_bootstrap, |
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87 #endif |
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88 #if SDL_AUDIO_DRIVER_MINT |
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89 &MINTAUDIO_GSXB_bootstrap, |
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90 &MINTAUDIO_MCSN_bootstrap, |
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91 &MINTAUDIO_STFA_bootstrap, |
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92 &MINTAUDIO_XBIOS_bootstrap, |
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93 &MINTAUDIO_DMA8_bootstrap, |
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94 #endif |
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95 #if SDL_AUDIO_DRIVER_DISK |
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96 &DISKAUD_bootstrap, |
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97 #endif |
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98 #if SDL_AUDIO_DRIVER_DUMMY |
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99 &DUMMYAUD_bootstrap, |
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100 #endif |
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101 #if SDL_AUDIO_DRIVER_DC |
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102 &DCAUD_bootstrap, |
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103 #endif |
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104 #if SDL_AUDIO_DRIVER_NDS |
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105 &NDSAUD_bootstrap, |
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106 #endif |
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107 #if SDL_AUDIO_DRIVER_MMEAUDIO |
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108 &MMEAUDIO_bootstrap, |
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109 #endif |
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110 #if SDL_AUDIO_DRIVER_DART |
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111 &DART_bootstrap, |
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112 #endif |
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113 #if SDL_AUDIO_DRIVER_EPOCAUDIO |
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114 &EPOCAudio_bootstrap, |
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115 #endif |
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116 NULL |
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117 }; |
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118 SDL_AudioDevice *current_audio = NULL; |
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119 |
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120 /* Various local functions */ |
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121 int SDL_AudioInit(const char *driver_name); |
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122 void SDL_AudioQuit(void); |
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123 |
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124 /* The general mixing thread function */ |
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125 int SDLCALL SDL_RunAudio(void *audiop) |
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126 { |
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127 SDL_AudioDevice *audio = (SDL_AudioDevice *)audiop; |
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128 Uint8 *stream; |
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129 int stream_len; |
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130 void *udata; |
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131 void (SDLCALL *fill)(void *userdata,Uint8 *stream, int len); |
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132 int silence; |
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133 |
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134 /* Perform any thread setup */ |
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135 if ( audio->ThreadInit ) { |
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136 audio->ThreadInit(audio); |
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137 } |
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138 audio->threadid = SDL_ThreadID(); |
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139 |
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140 /* Set up the mixing function */ |
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141 fill = audio->spec.callback; |
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142 udata = audio->spec.userdata; |
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143 |
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144 if ( audio->convert.needed ) { |
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145 if ( audio->convert.src_format == AUDIO_U8 ) { |
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146 silence = 0x80; |
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147 } else { |
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148 silence = 0; |
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149 } |
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150 stream_len = audio->convert.len; |
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151 } else { |
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152 silence = audio->spec.silence; |
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153 stream_len = audio->spec.size; |
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154 } |
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155 |
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156 #ifdef __OS2__ |
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157 /* Increase the priority of this thread to make sure that |
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158 the audio will be continuous all the time! */ |
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159 #ifdef USE_DOSSETPRIORITY |
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160 if (SDL_getenv("SDL_USE_TIMECRITICAL_AUDIO")) |
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161 { |
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162 #ifdef DEBUG_BUILD |
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163 printf("[SDL_RunAudio] : Setting priority to TimeCritical+0! (TID%d)\n", SDL_ThreadID()); |
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164 #endif |
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165 DosSetPriority(PRTYS_THREAD, PRTYC_TIMECRITICAL, 0, 0); |
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166 } |
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167 else |
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168 { |
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169 #ifdef DEBUG_BUILD |
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170 printf("[SDL_RunAudio] : Setting priority to ForegroundServer+0! (TID%d)\n", SDL_ThreadID()); |
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171 #endif |
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172 DosSetPriority(PRTYS_THREAD, PRTYC_FOREGROUNDSERVER, 0, 0); |
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173 } |
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174 #endif |
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175 #endif |
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176 |
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177 /* Loop, filling the audio buffers */ |
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178 while ( audio->enabled ) { |
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179 |
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180 /* Fill the current buffer with sound */ |
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181 if ( audio->convert.needed ) { |
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182 if ( audio->convert.buf ) { |
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183 stream = audio->convert.buf; |
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184 } else { |
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185 continue; |
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186 } |
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187 } else { |
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188 stream = audio->GetAudioBuf(audio); |
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189 if ( stream == NULL ) { |
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190 stream = audio->fake_stream; |
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191 } |
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192 } |
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193 |
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194 SDL_memset(stream, silence, stream_len); |
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195 |
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196 if ( ! audio->paused ) { |
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197 SDL_mutexP(audio->mixer_lock); |
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198 (*fill)(udata, stream, stream_len); |
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199 SDL_mutexV(audio->mixer_lock); |
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200 } |
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201 |
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202 /* Convert the audio if necessary */ |
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203 if ( audio->convert.needed ) { |
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204 SDL_ConvertAudio(&audio->convert); |
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205 stream = audio->GetAudioBuf(audio); |
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206 if ( stream == NULL ) { |
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207 stream = audio->fake_stream; |
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208 } |
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209 SDL_memcpy(stream, audio->convert.buf, |
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210 audio->convert.len_cvt); |
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211 } |
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212 |
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213 /* Ready current buffer for play and change current buffer */ |
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214 if ( stream != audio->fake_stream ) { |
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215 audio->PlayAudio(audio); |
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216 } |
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217 |
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218 /* Wait for an audio buffer to become available */ |
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219 if ( stream == audio->fake_stream ) { |
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220 SDL_Delay((audio->spec.samples*1000)/audio->spec.freq); |
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221 } else { |
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222 audio->WaitAudio(audio); |
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223 } |
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224 } |
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225 |
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226 /* Wait for the audio to drain.. */ |
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227 if ( audio->WaitDone ) { |
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228 audio->WaitDone(audio); |
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229 } |
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230 |
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231 #ifdef __OS2__ |
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232 #ifdef DEBUG_BUILD |
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233 printf("[SDL_RunAudio] : Task exiting. (TID%d)\n", SDL_ThreadID()); |
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234 #endif |
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235 #endif |
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236 return(0); |
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237 } |
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238 |
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239 static void SDL_LockAudio_Default(SDL_AudioDevice *audio) |
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240 { |
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241 if ( audio->thread && (SDL_ThreadID() == audio->threadid) ) { |
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242 return; |
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243 } |
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244 SDL_mutexP(audio->mixer_lock); |
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245 } |
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246 |
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247 static void SDL_UnlockAudio_Default(SDL_AudioDevice *audio) |
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248 { |
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249 if ( audio->thread && (SDL_ThreadID() == audio->threadid) ) { |
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250 return; |
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251 } |
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252 SDL_mutexV(audio->mixer_lock); |
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253 } |
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254 |
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255 static Uint16 SDL_ParseAudioFormat(const char *string) |
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256 { |
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257 Uint16 format = 0; |
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258 |
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259 switch (*string) { |
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260 case 'U': |
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261 ++string; |
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262 format |= 0x0000; |
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263 break; |
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264 case 'S': |
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265 ++string; |
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266 format |= 0x8000; |
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267 break; |
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268 default: |
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269 return 0; |
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270 } |
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271 switch (SDL_atoi(string)) { |
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272 case 8: |
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273 string += 1; |
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274 format |= 8; |
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275 break; |
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276 case 16: |
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277 string += 2; |
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278 format |= 16; |
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279 if ( SDL_strcmp(string, "LSB") == 0 |
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280 #if SDL_BYTEORDER == SDL_LIL_ENDIAN |
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281 || SDL_strcmp(string, "SYS") == 0 |
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282 #endif |
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283 ) { |
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284 format |= 0x0000; |
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285 } |
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286 if ( SDL_strcmp(string, "MSB") == 0 |
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287 #if SDL_BYTEORDER == SDL_BIG_ENDIAN |
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288 || SDL_strcmp(string, "SYS") == 0 |
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289 #endif |
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290 ) { |
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291 format |= 0x1000; |
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292 } |
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293 break; |
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294 default: |
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295 return 0; |
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296 } |
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297 return format; |
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298 } |
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299 |
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300 int SDL_AudioInit(const char *driver_name) |
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301 { |
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302 SDL_AudioDevice *audio; |
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303 int i = 0, idx; |
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304 |
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305 /* Check to make sure we don't overwrite 'current_audio' */ |
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306 if ( current_audio != NULL ) { |
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307 SDL_AudioQuit(); |
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308 } |
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309 |
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310 /* Select the proper audio driver */ |
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311 audio = NULL; |
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312 idx = 0; |
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313 #if SDL_AUDIO_DRIVER_ESD |
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314 if ( (driver_name == NULL) && (SDL_getenv("ESPEAKER") != NULL) ) { |
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315 /* Ahem, we know that if ESPEAKER is set, user probably wants |
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316 to use ESD, but don't start it if it's not already running. |
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317 This probably isn't the place to do this, but... Shh! :) |
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318 */ |
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319 for ( i=0; bootstrap[i]; ++i ) { |
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320 if ( SDL_strcasecmp(bootstrap[i]->name, "esd") == 0 ) { |
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321 #ifdef HAVE_PUTENV |
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322 const char *esd_no_spawn; |
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323 |
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324 /* Don't start ESD if it's not running */ |
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325 esd_no_spawn = getenv("ESD_NO_SPAWN"); |
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326 if ( esd_no_spawn == NULL ) { |
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327 putenv("ESD_NO_SPAWN=1"); |
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328 } |
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329 #endif |
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330 if ( bootstrap[i]->available() ) { |
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331 audio = bootstrap[i]->create(0); |
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332 break; |
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333 } |
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334 #ifdef HAVE_UNSETENV |
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335 if ( esd_no_spawn == NULL ) { |
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336 unsetenv("ESD_NO_SPAWN"); |
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337 } |
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338 #endif |
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339 } |
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340 } |
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341 } |
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342 #endif /* SDL_AUDIO_DRIVER_ESD */ |
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343 if ( audio == NULL ) { |
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344 if ( driver_name != NULL ) { |
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345 #if 0 /* This will be replaced with a better driver selection API */ |
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346 if ( SDL_strrchr(driver_name, ':') != NULL ) { |
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347 idx = atoi(SDL_strrchr(driver_name, ':')+1); |
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348 } |
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349 #endif |
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350 for ( i=0; bootstrap[i]; ++i ) { |
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351 if (SDL_strcasecmp(bootstrap[i]->name, driver_name) == 0) { |
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352 if ( bootstrap[i]->available() ) { |
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353 audio=bootstrap[i]->create(idx); |
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354 break; |
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355 } |
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356 } |
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357 } |
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358 } else { |
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359 for ( i=0; bootstrap[i]; ++i ) { |
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360 if ( bootstrap[i]->available() ) { |
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361 audio = bootstrap[i]->create(idx); |
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362 if ( audio != NULL ) { |
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363 break; |
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364 } |
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365 } |
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366 } |
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367 } |
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368 if ( audio == NULL ) { |
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369 SDL_SetError("No available audio device"); |
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370 #if 0 /* Don't fail SDL_Init() if audio isn't available. |
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371 SDL_OpenAudio() will handle it at that point. *sigh* |
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372 */ |
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373 return(-1); |
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374 #endif |
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375 } |
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376 } |
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377 current_audio = audio; |
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378 if ( current_audio ) { |
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379 current_audio->name = bootstrap[i]->name; |
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380 if ( !current_audio->LockAudio && !current_audio->UnlockAudio ) { |
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381 current_audio->LockAudio = SDL_LockAudio_Default; |
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382 current_audio->UnlockAudio = SDL_UnlockAudio_Default; |
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383 } |
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384 } |
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385 return(0); |
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386 } |
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387 |
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388 char *SDL_AudioDriverName(char *namebuf, int maxlen) |
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389 { |
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390 if ( current_audio != NULL ) { |
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391 SDL_strlcpy(namebuf, current_audio->name, maxlen); |
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392 return(namebuf); |
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393 } |
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394 return(NULL); |
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395 } |
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396 |
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397 int SDL_OpenAudio(SDL_AudioSpec *desired, SDL_AudioSpec *obtained) |
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398 { |
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399 SDL_AudioDevice *audio; |
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400 const char *env; |
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401 |
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402 /* Start up the audio driver, if necessary */ |
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403 if ( ! current_audio ) { |
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404 if ( (SDL_InitSubSystem(SDL_INIT_AUDIO) < 0) || |
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405 (current_audio == NULL) ) { |
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406 return(-1); |
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407 } |
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408 } |
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409 audio = current_audio; |
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410 |
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411 if (audio->opened) { |
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412 SDL_SetError("Audio device is already opened"); |
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413 return(-1); |
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414 } |
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415 |
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416 /* Verify some parameters */ |
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417 if ( desired->freq == 0 ) { |
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418 env = SDL_getenv("SDL_AUDIO_FREQUENCY"); |
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419 if ( env ) { |
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420 desired->freq = SDL_atoi(env); |
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421 } |
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422 } |
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423 if ( desired->freq == 0 ) { |
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424 /* Pick some default audio frequency */ |
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425 desired->freq = 22050; |
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426 } |
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427 if ( desired->format == 0 ) { |
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428 env = SDL_getenv("SDL_AUDIO_FORMAT"); |
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429 if ( env ) { |
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430 desired->format = SDL_ParseAudioFormat(env); |
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431 } |
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432 } |
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433 if ( desired->format == 0 ) { |
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434 /* Pick some default audio format */ |
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435 desired->format = AUDIO_S16; |
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436 } |
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437 if ( desired->channels == 0 ) { |
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438 env = SDL_getenv("SDL_AUDIO_CHANNELS"); |
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439 if ( env ) { |
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440 desired->channels = (Uint8)SDL_atoi(env); |
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441 } |
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442 } |
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443 if ( desired->channels == 0 ) { |
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444 /* Pick a default number of channels */ |
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445 desired->channels = 2; |
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446 } |
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447 switch ( desired->channels ) { |
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448 case 1: /* Mono */ |
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449 case 2: /* Stereo */ |
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450 case 4: /* surround */ |
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451 case 6: /* surround with center and lfe */ |
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452 break; |
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453 default: |
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454 SDL_SetError("1 (mono) and 2 (stereo) channels supported"); |
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455 return(-1); |
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456 } |
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457 if ( desired->samples == 0 ) { |
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458 env = SDL_getenv("SDL_AUDIO_SAMPLES"); |
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459 if ( env ) { |
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460 desired->samples = (Uint16)SDL_atoi(env); |
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461 } |
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462 } |
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463 if ( desired->samples == 0 ) { |
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464 /* Pick a default of ~46 ms at desired frequency */ |
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465 int samples = (desired->freq / 1000) * 46; |
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466 int power2 = 1; |
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467 while ( power2 < samples ) { |
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468 power2 *= 2; |
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469 } |
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470 desired->samples = power2; |
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471 } |
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472 if ( desired->callback == NULL ) { |
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473 SDL_SetError("SDL_OpenAudio() passed a NULL callback"); |
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474 return(-1); |
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475 } |
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476 |
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477 #if SDL_THREADS_DISABLED |
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478 /* Uses interrupt driven audio, without thread */ |
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479 #else |
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480 /* Create a semaphore for locking the sound buffers */ |
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481 audio->mixer_lock = SDL_CreateMutex(); |
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482 if ( audio->mixer_lock == NULL ) { |
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483 SDL_SetError("Couldn't create mixer lock"); |
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484 SDL_CloseAudio(); |
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485 return(-1); |
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486 } |
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487 #endif /* SDL_THREADS_DISABLED */ |
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488 |
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489 /* Calculate the silence and size of the audio specification */ |
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490 SDL_CalculateAudioSpec(desired); |
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491 |
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492 /* Open the audio subsystem */ |
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493 SDL_memcpy(&audio->spec, desired, sizeof(audio->spec)); |
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494 audio->convert.needed = 0; |
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495 audio->enabled = 1; |
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496 audio->paused = 1; |
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497 |
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498 audio->opened = audio->OpenAudio(audio, &audio->spec)+1; |
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499 |
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500 if ( ! audio->opened ) { |
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501 SDL_CloseAudio(); |
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502 return(-1); |
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503 } |
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504 |
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505 /* If the audio driver changes the buffer size, accept it */ |
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506 if ( audio->spec.samples != desired->samples ) { |
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507 desired->samples = audio->spec.samples; |
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508 SDL_CalculateAudioSpec(desired); |
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509 } |
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510 |
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511 /* Allocate a fake audio memory buffer */ |
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512 audio->fake_stream = SDL_AllocAudioMem(audio->spec.size); |
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513 if ( audio->fake_stream == NULL ) { |
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514 SDL_CloseAudio(); |
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515 SDL_OutOfMemory(); |
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516 return(-1); |
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517 } |
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518 |
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519 /* See if we need to do any conversion */ |
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520 if ( obtained != NULL ) { |
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521 SDL_memcpy(obtained, &audio->spec, sizeof(audio->spec)); |
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522 } else if ( desired->freq != audio->spec.freq || |
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523 desired->format != audio->spec.format || |
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524 desired->channels != audio->spec.channels ) { |
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525 /* Build an audio conversion block */ |
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526 if ( SDL_BuildAudioCVT(&audio->convert, |
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527 desired->format, desired->channels, |
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528 desired->freq, |
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529 audio->spec.format, audio->spec.channels, |
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530 audio->spec.freq) < 0 ) { |
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531 SDL_CloseAudio(); |
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532 return(-1); |
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533 } |
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534 if ( audio->convert.needed ) { |
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535 audio->convert.len = (int) ( ((double) desired->size) / |
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536 audio->convert.len_ratio ); |
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537 audio->convert.buf =(Uint8 *)SDL_AllocAudioMem( |
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538 audio->convert.len*audio->convert.len_mult); |
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539 if ( audio->convert.buf == NULL ) { |
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540 SDL_CloseAudio(); |
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541 SDL_OutOfMemory(); |
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542 return(-1); |
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543 } |
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544 } |
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545 } |
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546 |
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547 /* Start the audio thread if necessary */ |
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548 switch (audio->opened) { |
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549 case 1: |
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550 /* Start the audio thread */ |
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551 #if (defined(__WIN32__) && !defined(_WIN32_WCE)) && !defined(HAVE_LIBC) && !defined(__SYMBIAN32__) |
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552 #undef SDL_CreateThread |
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553 audio->thread = SDL_CreateThread(SDL_RunAudio, audio, NULL, NULL); |
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554 #else |
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555 audio->thread = SDL_CreateThread(SDL_RunAudio, audio); |
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556 #endif |
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557 if ( audio->thread == NULL ) { |
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558 SDL_CloseAudio(); |
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559 SDL_SetError("Couldn't create audio thread"); |
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560 return(-1); |
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561 } |
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562 break; |
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563 |
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564 default: |
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565 /* The audio is now playing */ |
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566 break; |
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567 } |
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568 |
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569 return(0); |
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570 } |
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571 |
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572 SDL_audiostatus SDL_GetAudioStatus(void) |
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573 { |
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574 SDL_AudioDevice *audio = current_audio; |
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575 SDL_audiostatus status; |
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576 |
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577 status = SDL_AUDIO_STOPPED; |
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578 if ( audio && audio->enabled ) { |
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579 if ( audio->paused ) { |
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580 status = SDL_AUDIO_PAUSED; |
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581 } else { |
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582 status = SDL_AUDIO_PLAYING; |
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583 } |
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584 } |
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585 return(status); |
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586 } |
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587 |
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588 void SDL_PauseAudio (int pause_on) |
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589 { |
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590 SDL_AudioDevice *audio = current_audio; |
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591 |
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592 if ( audio ) { |
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593 audio->paused = pause_on; |
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594 } |
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595 } |
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596 |
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597 void SDL_LockAudio (void) |
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598 { |
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599 SDL_AudioDevice *audio = current_audio; |
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600 |
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601 /* Obtain a lock on the mixing buffers */ |
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602 if ( audio && audio->LockAudio ) { |
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603 audio->LockAudio(audio); |
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604 } |
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605 } |
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606 |
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607 void SDL_UnlockAudio (void) |
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608 { |
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609 SDL_AudioDevice *audio = current_audio; |
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610 |
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611 /* Release lock on the mixing buffers */ |
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612 if ( audio && audio->UnlockAudio ) { |
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613 audio->UnlockAudio(audio); |
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614 } |
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615 } |
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616 |
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617 void SDL_CloseAudio (void) |
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618 { |
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619 SDL_QuitSubSystem(SDL_INIT_AUDIO); |
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620 } |
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621 |
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622 void SDL_AudioQuit(void) |
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623 { |
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624 SDL_AudioDevice *audio = current_audio; |
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625 |
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626 if ( audio ) { |
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627 audio->enabled = 0; |
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628 if ( audio->thread != NULL ) { |
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629 SDL_WaitThread(audio->thread, NULL); |
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630 } |
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631 if ( audio->mixer_lock != NULL ) { |
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632 SDL_DestroyMutex(audio->mixer_lock); |
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633 } |
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634 if ( audio->fake_stream != NULL ) { |
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635 SDL_FreeAudioMem(audio->fake_stream); |
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636 } |
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637 if ( audio->convert.needed ) { |
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638 SDL_FreeAudioMem(audio->convert.buf); |
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639 |
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640 } |
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641 if ( audio->opened ) { |
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642 audio->CloseAudio(audio); |
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643 audio->opened = 0; |
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644 } |
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645 /* Free the driver data */ |
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646 audio->free(audio); |
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647 current_audio = NULL; |
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648 } |
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649 } |
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650 |
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651 #define NUM_FORMATS 6 |
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652 static int format_idx; |
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653 static int format_idx_sub; |
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654 static Uint16 format_list[NUM_FORMATS][NUM_FORMATS] = { |
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655 { AUDIO_U8, AUDIO_S8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB }, |
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656 { AUDIO_S8, AUDIO_U8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB }, |
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657 { AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_U8, AUDIO_S8 }, |
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658 { AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_U8, AUDIO_S8 }, |
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659 { AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U8, AUDIO_S8 }, |
|
660 { AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_U8, AUDIO_S8 }, |
|
661 }; |
|
662 |
|
663 Uint16 SDL_FirstAudioFormat(Uint16 format) |
|
664 { |
|
665 for ( format_idx=0; format_idx < NUM_FORMATS; ++format_idx ) { |
|
666 if ( format_list[format_idx][0] == format ) { |
|
667 break; |
|
668 } |
|
669 } |
|
670 format_idx_sub = 0; |
|
671 return(SDL_NextAudioFormat()); |
|
672 } |
|
673 |
|
674 Uint16 SDL_NextAudioFormat(void) |
|
675 { |
|
676 if ( (format_idx == NUM_FORMATS) || (format_idx_sub == NUM_FORMATS) ) { |
|
677 return(0); |
|
678 } |
|
679 return(format_list[format_idx][format_idx_sub++]); |
|
680 } |
|
681 |
|
682 void SDL_CalculateAudioSpec(SDL_AudioSpec *spec) |
|
683 { |
|
684 switch (spec->format) { |
|
685 case AUDIO_U8: |
|
686 spec->silence = 0x80; |
|
687 break; |
|
688 default: |
|
689 spec->silence = 0x00; |
|
690 break; |
|
691 } |
|
692 spec->size = (spec->format&0xFF)/8; |
|
693 spec->size *= spec->channels; |
|
694 spec->size *= spec->samples; |
|
695 } |