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annotate src/audio/arts/SDL_artsaudio.c @ 3984:b74530a1dad6 SDL-1.2

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Better fix for bug 419
author Sam Lantinga <slouken@libsdl.org>
date Thu, 28 Jun 2007 05:35:50 +0000
parents 33c248ea75f9
children 7e878cc4250a
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 static int (*SDL_NAME(arts_suspended))(void);
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64 static const char *(*SDL_NAME(arts_error_text))(int errorcode);
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65
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66 static struct {
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67 const char *name;
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68 void **func;
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69 } arts_functions[] = {
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70 { "arts_init", (void **)&SDL_NAME(arts_init) },
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71 { "arts_free", (void **)&SDL_NAME(arts_free) },
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72 { "arts_play_stream", (void **)&SDL_NAME(arts_play_stream) },
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73 { "arts_stream_set", (void **)&SDL_NAME(arts_stream_set) },
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74 { "arts_stream_get", (void **)&SDL_NAME(arts_stream_get) },
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75 { "arts_write", (void **)&SDL_NAME(arts_write) },
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76 { "arts_close_stream", (void **)&SDL_NAME(arts_close_stream) },
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77 { "arts_suspended", (void **)&SDL_NAME(arts_suspended) },
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78 { "arts_error_text", (void **)&SDL_NAME(arts_error_text) },
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79 };
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80
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81 static void UnloadARTSLibrary()
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82 {
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83 if ( arts_loaded ) {
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84 SDL_UnloadObject(arts_handle);
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85 arts_handle = NULL;
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86 arts_loaded = 0;
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87 }
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88 }
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89
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90 static int LoadARTSLibrary(void)
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91 {
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92 int i, retval = -1;
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93
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94 arts_handle = SDL_LoadObject(arts_library);
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95 if ( arts_handle ) {
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96 arts_loaded = 1;
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97 retval = 0;
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98 for ( i=0; i<SDL_arraysize(arts_functions); ++i ) {
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99 *arts_functions[i].func = SDL_LoadFunction(arts_handle, arts_functions[i].name);
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100 if ( !*arts_functions[i].func ) {
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101 retval = -1;
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102 UnloadARTSLibrary();
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103 break;
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104 }
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105 }
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106 }
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107 return retval;
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108 }
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109
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110 #else
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111
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112 static void UnloadARTSLibrary()
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113 {
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114 return;
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115 }
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116
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117 static int LoadARTSLibrary(void)
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118 {
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119 return 0;
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120 }
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121
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122 #endif /* SDL_AUDIO_DRIVER_ARTS_DYNAMIC */
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123
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124 /* Audio driver bootstrap functions */
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125
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126 static int Audio_Available(void)
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127 {
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128 int available = 0;
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129
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130 if ( LoadARTSLibrary() < 0 ) {
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131 return available;
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132 }
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133 if ( SDL_NAME(arts_init)() == 0 ) {
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134 if ( SDL_NAME(arts_suspended)() ) {
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135 /* Play a stream so aRts doesn't crash */
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136 arts_stream_t stream2;
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137 stream2=SDL_NAME(arts_play_stream)(44100, 16, 2, "SDL");
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138 SDL_NAME(arts_write)(stream2, "", 0);
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139 SDL_NAME(arts_close_stream)(stream2);
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140 available = 1;
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141 }
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142 SDL_NAME(arts_free)();
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143 }
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144 UnloadARTSLibrary();
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145
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146 return available;
0
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147 }
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148
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149 static void Audio_DeleteDevice(SDL_AudioDevice *device)
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150 {
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151 SDL_free(device->hidden);
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152 SDL_free(device);
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153 UnloadARTSLibrary();
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154 }
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155
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156 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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157 {
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158 SDL_AudioDevice *this;
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159
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160 /* Initialize all variables that we clean on shutdown */
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161 LoadARTSLibrary();
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162 this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice));
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163 if ( this ) {
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164 SDL_memset(this, 0, (sizeof *this));
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165 this->hidden = (struct SDL_PrivateAudioData *)
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166 SDL_malloc((sizeof *this->hidden));
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167 }
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168 if ( (this == NULL) || (this->hidden == NULL) ) {
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169 SDL_OutOfMemory();
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170 if ( this ) {
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171 SDL_free(this);
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172 }
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173 return(0);
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174 }
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175 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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176 stream = 0;
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177
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178 /* Set the function pointers */
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179 this->OpenAudio = ARTS_OpenAudio;
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180 this->WaitAudio = ARTS_WaitAudio;
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181 this->PlayAudio = ARTS_PlayAudio;
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182 this->GetAudioBuf = ARTS_GetAudioBuf;
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183 this->CloseAudio = ARTS_CloseAudio;
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184
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185 this->free = Audio_DeleteDevice;
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186
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187 return this;
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188 }
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189
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190 AudioBootStrap ARTS_bootstrap = {
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191 ARTS_DRIVER_NAME, "Analog Realtime Synthesizer",
0
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192 Audio_Available, Audio_CreateDevice
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193 };
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194
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195 /* This function waits until it is possible to write a full sound buffer */
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196 static void ARTS_WaitAudio(_THIS)
0
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197 {
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198 Sint32 ticks;
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199
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200 /* Check to see if the thread-parent process is still alive */
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201 { static int cnt = 0;
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202 /* Note that this only works with thread implementations
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203 that use a different process id for each thread.
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204 */
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205 if (parent && (((++cnt)%10) == 0)) { /* Check every 10 loops */
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206 if ( kill(parent, 0) < 0 ) {
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207 this->enabled = 0;
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208 }
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209 }
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210 }
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211
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212 /* Use timer for general audio synchronization */
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213 ticks = ((Sint32)(next_frame - SDL_GetTicks()))-FUDGE_TICKS;
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214 if ( ticks > 0 ) {
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215 SDL_Delay(ticks);
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216 }
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217 }
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218
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219 static void ARTS_PlayAudio(_THIS)
0
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220 {
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221 int written;
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222
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223 /* Write the audio data */
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224 written = SDL_NAME(arts_write)(stream, mixbuf, mixlen);
0
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225
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226 /* If timer synchronization is enabled, set the next write frame */
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227 if ( frame_ticks ) {
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228 next_frame += frame_ticks;
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229 }
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230
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231 /* If we couldn't write, assume fatal error for now */
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232 if ( written < 0 ) {
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233 this->enabled = 0;
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234 }
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235 #ifdef DEBUG_AUDIO
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236 fprintf(stderr, "Wrote %d bytes of audio data\n", written);
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237 #endif
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238 }
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239
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240 static Uint8 *ARTS_GetAudioBuf(_THIS)
0
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241 {
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242 return(mixbuf);
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243 }
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244
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245 static void ARTS_CloseAudio(_THIS)
0
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246 {
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247 if ( mixbuf != NULL ) {
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248 SDL_FreeAudioMem(mixbuf);
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249 mixbuf = NULL;
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250 }
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251 if ( stream ) {
294
d2d48e10f370 Added a new header file: SDL_loadso.h
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252 SDL_NAME(arts_close_stream)(stream);
0
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253 stream = 0;
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254 }
294
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255 SDL_NAME(arts_free)();
0
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256 }
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257
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258 static int ARTS_OpenAudio(_THIS, SDL_AudioSpec *spec)
0
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259 {
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260 int bits, frag_spec;
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261 Uint16 test_format, format;
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262 int error_code;
0
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263
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264 /* Reset the timer synchronization flag */
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265 frame_ticks = 0.0;
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266
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267 mixbuf = NULL;
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268
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269 /* Try for a closest match on audio format */
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270 format = 0;
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271 bits = 0;
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272 for ( test_format = SDL_FirstAudioFormat(spec->format);
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273 ! format && test_format; ) {
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274 #ifdef DEBUG_AUDIO
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275 fprintf(stderr, "Trying format 0x%4.4x\n", test_format);
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276 #endif
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277 switch ( test_format ) {
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278 case AUDIO_U8:
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279 bits = 8;
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280 format = 1;
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281 break;
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282 case AUDIO_S16LSB:
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283 bits = 16;
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284 format = 1;
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285 break;
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286 default:
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287 format = 0;
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288 break;
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289 }
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290 if ( ! format ) {
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291 test_format = SDL_NextAudioFormat();
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292 }
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293 }
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294 if ( format == 0 ) {
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295 SDL_SetError("Couldn't find any hardware audio formats");
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296 return(-1);
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297 }
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298 spec->format = test_format;
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299
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300 error_code = SDL_NAME(arts_init)();
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301 if ( error_code != 0 ) {
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302 SDL_SetError("Unable to initialize ARTS: %s", SDL_NAME(arts_error_text)(error_code));
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303 return(-1);
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304 }
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305 if ( ! SDL_NAME(arts_suspended)() ) {
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306 SDL_SetError("ARTS can not open audio device");
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307 return(-1);
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308 }
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309 stream = SDL_NAME(arts_play_stream)(spec->freq, bits, spec->channels, "SDL");
0
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310
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311 /* Calculate the final parameters for this audio specification */
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312 SDL_CalculateAudioSpec(spec);
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313
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314 /* Determine the power of two of the fragment size */
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315 for ( frag_spec = 0; (0x01<<frag_spec) < spec->size; ++frag_spec );
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316 if ( (0x01<<frag_spec) != spec->size ) {
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317 SDL_SetError("Fragment size must be a power of two");
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318 return(-1);
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319 }
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320 frag_spec |= 0x00020000; /* two fragments, for low latency */
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321
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322 #ifdef ARTS_P_PACKET_SETTINGS
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323 SDL_NAME(arts_stream_set)(stream, ARTS_P_PACKET_SETTINGS, frag_spec);
0
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324 #else
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325 SDL_NAME(arts_stream_set)(stream, ARTS_P_PACKET_SIZE, frag_spec&0xffff);
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326 SDL_NAME(arts_stream_set)(stream, ARTS_P_PACKET_COUNT, frag_spec>>16);
0
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327 #endif
294
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328 spec->size = SDL_NAME(arts_stream_get)(stream, ARTS_P_PACKET_SIZE);
0
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329
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330 /* Allocate mixing buffer */
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331 mixlen = spec->size;
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332 mixbuf = (Uint8 *)SDL_AllocAudioMem(mixlen);
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333 if ( mixbuf == NULL ) {
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334 return(-1);
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335 }
1336
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parents: 1312
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336 SDL_memset(mixbuf, spec->silence, spec->size);
0
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337
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338 /* Get the parent process id (we're the parent of the audio thread) */
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339 parent = getpid();
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340
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341 /* We're ready to rock and roll. :-) */
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342 return(0);
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343 }