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annotate src/audio/arts/SDL_artsaudio.c @ 1650:ee4f2d77206f

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author Sam Lantinga <slouken@libsdl.org>
date Sat, 22 Apr 2006 19:50:23 +0000
parents d910939febfa
children 782fd950bd46 c121d94672cb 33c248ea75f9
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_audiodev_c.h"
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31 #include "SDL_artsaudio.h"
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32
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33 #ifdef SDL_AUDIO_DRIVER_ARTS_DYNAMIC
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34 #include "SDL_name.h"
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35 #include "SDL_loadso.h"
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36 #else
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37 #define SDL_NAME(X) X
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38 #endif
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39
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40 /* The tag name used by artsc audio */
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41 #define ARTS_DRIVER_NAME "arts"
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42
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43 /* Audio driver functions */
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44 static int ARTS_OpenAudio(_THIS, SDL_AudioSpec *spec);
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45 static void ARTS_WaitAudio(_THIS);
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46 static void ARTS_PlayAudio(_THIS);
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47 static Uint8 *ARTS_GetAudioBuf(_THIS);
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48 static void ARTS_CloseAudio(_THIS);
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49
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50 #ifdef SDL_AUDIO_DRIVER_ARTS_DYNAMIC
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51
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52 static const char *arts_library = SDL_AUDIO_DRIVER_ARTS_DYNAMIC;
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53 static void *arts_handle = NULL;
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54 static int arts_loaded = 0;
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55
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56 static int (*SDL_NAME(arts_init))(void);
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57 static void (*SDL_NAME(arts_free))(void);
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58 static arts_stream_t (*SDL_NAME(arts_play_stream))(int rate, int bits, int channels, const char *name);
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59 static int (*SDL_NAME(arts_stream_set))(arts_stream_t s, arts_parameter_t param, int value);
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60 static int (*SDL_NAME(arts_stream_get))(arts_stream_t s, arts_parameter_t param);
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61 static int (*SDL_NAME(arts_write))(arts_stream_t s, const void *buffer, int count);
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62 static void (*SDL_NAME(arts_close_stream))(arts_stream_t s);
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63
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64 static struct {
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65 const char *name;
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66 void **func;
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67 } arts_functions[] = {
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68 { "arts_init", (void **)&SDL_NAME(arts_init) },
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69 { "arts_free", (void **)&SDL_NAME(arts_free) },
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70 { "arts_play_stream", (void **)&SDL_NAME(arts_play_stream) },
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71 { "arts_stream_set", (void **)&SDL_NAME(arts_stream_set) },
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72 { "arts_stream_get", (void **)&SDL_NAME(arts_stream_get) },
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73 { "arts_write", (void **)&SDL_NAME(arts_write) },
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74 { "arts_close_stream", (void **)&SDL_NAME(arts_close_stream) },
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75 };
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76
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77 static void UnloadARTSLibrary()
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78 {
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79 if ( arts_loaded ) {
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80 SDL_UnloadObject(arts_handle);
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81 arts_handle = NULL;
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82 arts_loaded = 0;
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83 }
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84 }
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85
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86 static int LoadARTSLibrary(void)
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87 {
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88 int i, retval = -1;
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89
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90 arts_handle = SDL_LoadObject(arts_library);
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91 if ( arts_handle ) {
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92 arts_loaded = 1;
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93 retval = 0;
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94 for ( i=0; i<SDL_arraysize(arts_functions); ++i ) {
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95 *arts_functions[i].func = SDL_LoadFunction(arts_handle, arts_functions[i].name);
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96 if ( !*arts_functions[i].func ) {
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97 retval = -1;
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98 UnloadARTSLibrary();
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99 break;
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100 }
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101 }
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102 }
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103 return retval;
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104 }
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105
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106 #else
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107
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108 static void UnloadARTSLibrary()
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109 {
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110 return;
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111 }
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112
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113 static int LoadARTSLibrary(void)
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114 {
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115 return 0;
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116 }
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117
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118 #endif /* SDL_AUDIO_DRIVER_ARTS_DYNAMIC */
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119
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120 /* Audio driver bootstrap functions */
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121
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122 static int Audio_Available(void)
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123 {
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124 int available = 0;
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125
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126 if ( LoadARTSLibrary() < 0 ) {
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127 return available;
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128 }
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129 if ( SDL_NAME(arts_init)() == 0 ) {
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130 #define ARTS_CRASH_HACK /* Play a stream so aRts doesn't crash */
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131 #ifdef ARTS_CRASH_HACK
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132 arts_stream_t stream2;
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133 stream2=SDL_NAME(arts_play_stream)(44100, 16, 2, "SDL");
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134 SDL_NAME(arts_write)(stream2, "", 0);
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135 SDL_NAME(arts_close_stream)(stream2);
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136 #endif
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137 available = 1;
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138 SDL_NAME(arts_free)();
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139 }
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140 UnloadARTSLibrary();
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141
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142 return available;
0
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143 }
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144
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145 static void Audio_DeleteDevice(SDL_AudioDevice *device)
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146 {
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147 SDL_free(device->hidden);
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148 SDL_free(device);
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149 UnloadARTSLibrary();
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150 }
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151
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152 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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153 {
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154 SDL_AudioDevice *this;
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155
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156 /* Initialize all variables that we clean on shutdown */
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157 LoadARTSLibrary();
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158 this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice));
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159 if ( this ) {
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160 SDL_memset(this, 0, (sizeof *this));
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161 this->hidden = (struct SDL_PrivateAudioData *)
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162 SDL_malloc((sizeof *this->hidden));
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163 }
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164 if ( (this == NULL) || (this->hidden == NULL) ) {
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165 SDL_OutOfMemory();
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166 if ( this ) {
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167 SDL_free(this);
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168 }
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169 return(0);
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170 }
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171 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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172 stream = 0;
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173
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174 /* Set the function pointers */
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175 this->OpenAudio = ARTS_OpenAudio;
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176 this->WaitAudio = ARTS_WaitAudio;
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177 this->PlayAudio = ARTS_PlayAudio;
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178 this->GetAudioBuf = ARTS_GetAudioBuf;
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179 this->CloseAudio = ARTS_CloseAudio;
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180
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181 this->free = Audio_DeleteDevice;
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182
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183 return this;
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184 }
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185
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186 AudioBootStrap ARTS_bootstrap = {
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187 ARTS_DRIVER_NAME, "Analog Realtime Synthesizer",
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188 Audio_Available, Audio_CreateDevice
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189 };
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190
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191 /* This function waits until it is possible to write a full sound buffer */
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192 static void ARTS_WaitAudio(_THIS)
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193 {
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194 Sint32 ticks;
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195
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196 /* Check to see if the thread-parent process is still alive */
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197 { static int cnt = 0;
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198 /* Note that this only works with thread implementations
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199 that use a different process id for each thread.
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200 */
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201 if (parent && (((++cnt)%10) == 0)) { /* Check every 10 loops */
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202 if ( kill(parent, 0) < 0 ) {
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203 this->enabled = 0;
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204 }
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205 }
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206 }
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207
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208 /* Use timer for general audio synchronization */
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209 ticks = ((Sint32)(next_frame - SDL_GetTicks()))-FUDGE_TICKS;
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210 if ( ticks > 0 ) {
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211 SDL_Delay(ticks);
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212 }
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213 }
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214
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215 static void ARTS_PlayAudio(_THIS)
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216 {
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217 int written;
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218
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219 /* Write the audio data */
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220 written = SDL_NAME(arts_write)(stream, mixbuf, mixlen);
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221
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222 /* If timer synchronization is enabled, set the next write frame */
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223 if ( frame_ticks ) {
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224 next_frame += frame_ticks;
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225 }
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226
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227 /* If we couldn't write, assume fatal error for now */
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228 if ( written < 0 ) {
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229 this->enabled = 0;
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230 }
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231 #ifdef DEBUG_AUDIO
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232 fprintf(stderr, "Wrote %d bytes of audio data\n", written);
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233 #endif
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234 }
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235
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236 static Uint8 *ARTS_GetAudioBuf(_THIS)
0
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237 {
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238 return(mixbuf);
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239 }
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240
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241 static void ARTS_CloseAudio(_THIS)
0
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242 {
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243 if ( mixbuf != NULL ) {
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244 SDL_FreeAudioMem(mixbuf);
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245 mixbuf = NULL;
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246 }
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247 if ( stream ) {
294
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248 SDL_NAME(arts_close_stream)(stream);
0
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249 stream = 0;
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250 }
294
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251 SDL_NAME(arts_free)();
0
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252 }
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253
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254 static int ARTS_OpenAudio(_THIS, SDL_AudioSpec *spec)
0
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255 {
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256 int bits, frag_spec;
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257 Uint16 test_format, format;
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258
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259 /* Reset the timer synchronization flag */
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260 frame_ticks = 0.0;
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261
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262 mixbuf = NULL;
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263
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264 /* Try for a closest match on audio format */
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265 format = 0;
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266 bits = 0;
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267 for ( test_format = SDL_FirstAudioFormat(spec->format);
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268 ! format && test_format; ) {
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269 #ifdef DEBUG_AUDIO
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270 fprintf(stderr, "Trying format 0x%4.4x\n", test_format);
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271 #endif
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272 switch ( test_format ) {
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273 case AUDIO_U8:
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274 bits = 8;
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275 format = 1;
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276 break;
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277 case AUDIO_S16LSB:
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278 bits = 16;
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279 format = 1;
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280 break;
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281 default:
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282 format = 0;
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283 break;
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284 }
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285 if ( ! format ) {
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286 test_format = SDL_NextAudioFormat();
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287 }
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288 }
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289 if ( format == 0 ) {
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290 SDL_SetError("Couldn't find any hardware audio formats");
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291 return(-1);
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292 }
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293 spec->format = test_format;
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294
294
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295 if ( SDL_NAME(arts_init)() != 0 ) {
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296 SDL_SetError("Unable to initialize ARTS");
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297 return(-1);
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298 }
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299 stream = SDL_NAME(arts_play_stream)(spec->freq, bits, spec->channels, "SDL");
0
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300
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301 /* Calculate the final parameters for this audio specification */
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302 SDL_CalculateAudioSpec(spec);
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303
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304 /* Determine the power of two of the fragment size */
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305 for ( frag_spec = 0; (0x01<<frag_spec) < spec->size; ++frag_spec );
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306 if ( (0x01<<frag_spec) != spec->size ) {
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307 SDL_SetError("Fragment size must be a power of two");
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308 return(-1);
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309 }
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310 frag_spec |= 0x00020000; /* two fragments, for low latency */
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311
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312 #ifdef ARTS_P_PACKET_SETTINGS
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313 SDL_NAME(arts_stream_set)(stream, ARTS_P_PACKET_SETTINGS, frag_spec);
0
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314 #else
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315 SDL_NAME(arts_stream_set)(stream, ARTS_P_PACKET_SIZE, frag_spec&0xffff);
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316 SDL_NAME(arts_stream_set)(stream, ARTS_P_PACKET_COUNT, frag_spec>>16);
0
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317 #endif
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318 spec->size = SDL_NAME(arts_stream_get)(stream, ARTS_P_PACKET_SIZE);
0
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319
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320 /* Allocate mixing buffer */
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321 mixlen = spec->size;
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322 mixbuf = (Uint8 *)SDL_AllocAudioMem(mixlen);
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323 if ( mixbuf == NULL ) {
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324 return(-1);
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325 }
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326 SDL_memset(mixbuf, spec->silence, spec->size);
0
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327
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328 /* Get the parent process id (we're the parent of the audio thread) */
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329 parent = getpid();
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330
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331 /* We're ready to rock and roll. :-) */
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332 return(0);
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333 }