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annotate src/audio/arts/SDL_artsaudio.c @ 3814:8e1af9ff0e1f SDL-ryan-multiple-audio-device

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One more minor cleanup in arts driver.
author Ryan C. Gordon <icculus@icculus.org>
date Fri, 06 Oct 2006 03:40:57 +0000
parents 92f7304e50ff
children 9d070c1a45fa
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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14
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15 You should have received a copy of the GNU Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23
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24 /* Allow access to a raw mixing buffer */
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25
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26 #include "SDL_timer.h"
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27 #include "SDL_audio.h"
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28 #include "../SDL_audiomem.h"
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29 #include "../SDL_audio_c.h"
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30 #include "SDL_artsaudio.h"
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31
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32 #ifdef SDL_AUDIO_DRIVER_ARTS_DYNAMIC
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33 #include "SDL_name.h"
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34 #include "SDL_loadso.h"
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35 #else
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36 #define SDL_NAME(X) X
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37 #endif
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38
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39 /* The tag name used by artsc audio */
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40 #define ARTS_DRIVER_NAME "arts"
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41
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42 /* Audio driver functions */
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43 static int ARTS_OpenDevice(_THIS, const char *devname, int iscapture);
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44 static void ARTS_WaitDevice(_THIS);
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45 static void ARTS_PlayDevice(_THIS);
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46 static Uint8 *ARTS_GetDeviceBuf(_THIS);
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47 static void ARTS_CloseDevice(_THIS);
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48 static void ARTS_WaitDone(_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
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55 /* !!! FIXME: I hate this SDL_NAME clutter...it makes everything so messy! */
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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,
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59 int channels,
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60 const char *name);
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61 static int (*SDL_NAME(arts_stream_set)) (arts_stream_t s,
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62 arts_parameter_t param, int value);
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63 static int (*SDL_NAME(arts_stream_get)) (arts_stream_t s,
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64 arts_parameter_t param);
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65 static int (*SDL_NAME(arts_write)) (arts_stream_t s, const void *buffer,
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66 int count);
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67 static void (*SDL_NAME(arts_close_stream)) (arts_stream_t s);
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68 static void (*SDL_NAME(arts_close_stream)) (arts_stream_t s);
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69 static const char *(*SDL_NAME(arts_error_text)) (int errorcode);
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70
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71 #define SDL_ARTS_SYM(x) { #x, (void **) (char *) &SDL_NAME(x) }
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72 static struct
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73 {
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74 const char *name;
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75 void **func;
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76 } arts_functions[] = {
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77 SDL_ARTS_SYM(arts_init),
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78 SDL_ARTS_SYM(arts_free),
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79 SDL_ARTS_SYM(arts_play_stream),
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80 SDL_ARTS_SYM(arts_stream_set),
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81 SDL_ARTS_SYM(arts_stream_get),
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82 SDL_ARTS_SYM(arts_write),
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83 SDL_ARTS_SYM(arts_close_stream),
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84 SDL_ARTS_SYM(arts_error_text),
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85 };
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86 #undef SDL_ARTS_SYM
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87
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88 static void
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89 UnloadARTSLibrary()
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90 {
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91 if (arts_handle != NULL) {
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92 SDL_UnloadObject(arts_handle);
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93 arts_handle = NULL;
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94 }
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95 }
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96
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97 static int
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98 LoadARTSLibrary(void)
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99 {
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100 int i, retval = -1;
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101
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102 if (arts_handle == NULL) {
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103 arts_handle = SDL_LoadObject(arts_library);
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104 if (arts_handle != NULL) {
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105 retval = 0;
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106 for (i = 0; i < SDL_arraysize(arts_functions); ++i) {
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107 *arts_functions[i].func =
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108 SDL_LoadFunction(arts_handle, arts_functions[i].name);
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109 if (!*arts_functions[i].func) {
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110 retval = -1;
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111 UnloadARTSLibrary();
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112 break;
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113 }
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114 }
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115 }
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116 }
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117
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118 return retval;
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119 }
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120
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121 #else
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122
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123 static void
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124 UnloadARTSLibrary()
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125 {
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126 return;
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127 }
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128
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129 static int
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130 LoadARTSLibrary(void)
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131 {
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132 return 0;
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133 }
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134
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135 #endif /* SDL_AUDIO_DRIVER_ARTS_DYNAMIC */
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136
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137 /* Audio driver bootstrap functions */
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138
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139 static int
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140 ARTS_Available(void)
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141 {
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142 int available = 0;
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143
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144 if (LoadARTSLibrary() == 0) {
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145 if (SDL_NAME(arts_init) () == 0) {
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146 #define ARTS_CRASH_HACK /* Play a stream so aRts doesn't crash */
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147 #ifdef ARTS_CRASH_HACK
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148 arts_stream_t stream;
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149 stream = SDL_NAME(arts_play_stream) (44100, 16, 2, "SDL");
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150 SDL_NAME(arts_write) (stream, "", 0);
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151 SDL_NAME(arts_close_stream) (stream);
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152 #endif
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153 available = 1;
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154 SDL_NAME(arts_free) ();
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155 }
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156 UnloadARTSLibrary();
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157 }
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158
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159 return available;
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160 }
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161
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162
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163 static int
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164 ARTS_Init(SDL_AudioDriverImpl *impl)
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165 {
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166 /* Set the function pointers */
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167 impl->OpenDevice = ARTS_OpenDevice;
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168 impl->PlayDevice = ARTS_PlayDevice;
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169 impl->WaitDevice = ARTS_WaitDevice;
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170 impl->GetDeviceBuf = ARTS_GetDeviceBuf;
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171 impl->CloseDevice = ARTS_CloseDevice;
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172 impl->WaitDone = ARTS_WaitDone;
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173 impl->OnlyHasDefaultOutputDevice = 1;
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174
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175 return 1;
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176 }
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177
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178
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179 AudioBootStrap ARTS_bootstrap = {
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180 ARTS_DRIVER_NAME, "Analog RealTime Synthesizer",
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181 ARTS_Available, ARTS_Init, 0
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182 };
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183
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184
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185 /* This function waits until it is possible to write a full sound buffer */
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186 static void
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187 ARTS_WaitDevice(_THIS)
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188 {
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189 Sint32 ticks;
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190
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191 /* Check to see if the thread-parent process is still alive */
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192 {
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193 static int cnt = 0;
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194 /* Note that this only works with thread implementations
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195 that use a different process id for each thread.
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196 */
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197 /* Check every 10 loops */
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198 if (this->hidden->parent && (((++cnt) % 10) == 0)) {
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199 if (kill(this->hidden->parent, 0) < 0) {
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200 this->enabled = 0;
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201 }
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202 }
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203 }
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204
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205 /* Use timer for general audio synchronization */
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206 ticks = ((Sint32) (this->hidden->next_frame-SDL_GetTicks())) - FUDGE_TICKS;
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207 if (ticks > 0) {
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208 SDL_Delay(ticks);
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209 }
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210 }
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211
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212 static void
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213 ARTS_PlayDevice(_THIS)
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214 {
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215 /* Write the audio data */
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216 int written = SDL_NAME(arts_write) (
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217 this->hidden->stream,
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218 this->hidden->mixbuf,
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219 this->hidden->mixlen);
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220
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221 /* If timer synchronization is enabled, set the next write frame */
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222 if (this->hidden->frame_ticks) {
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223 this->hidden->next_frame += this->hidden->frame_ticks;
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224 }
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225
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226 /* If we couldn't write, assume fatal error for now */
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227 if (written < 0) {
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228 this->enabled = 0;
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229 }
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230 #ifdef DEBUG_AUDIO
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231 fprintf(stderr, "Wrote %d bytes of audio data\n", written);
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232 #endif
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233 }
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234
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235 static void
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236 ARTS_WaitDone(_THIS)
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237 {
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238 /* !!! FIXME: camp here until buffer drains... SDL_Delay(???); */
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239 }
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240
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241
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242 static Uint8 *
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243 ARTS_GetDeviceBuf(_THIS)
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244 {
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245 return (this->hidden->mixbuf);
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246 }
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247
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248
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249 static void
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250 ARTS_CloseDevice(_THIS)
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251 {
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252 if (this->hidden != NULL) {
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253 if (this->hidden->mixbuf != NULL) {
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254 SDL_FreeAudioMem(this->hidden->mixbuf);
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255 this->hidden->mixbuf = NULL;
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256 }
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257 if (this->hidden->stream) {
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258 SDL_NAME(arts_close_stream) (this->hidden->stream);
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259 this->hidden->stream = 0;
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260 }
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261 SDL_NAME(arts_free) ();
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262 SDL_free(this->hidden);
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diff changeset
263 this->hidden = NULL;
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264 }
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265 UnloadARTSLibrary();
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266 }
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267
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268
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269 static int
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270 ARTS_OpenDevice(_THIS, const char *devname, int iscapture)
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271 {
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272 int rc = 0;
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273 int bits = 0, frag_spec = 0;
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274 SDL_AudioFormat test_format = 0, format = 0;
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275
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276 /* Initialize all variables that we clean on shutdown */
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277 this->hidden = (struct SDL_PrivateAudioData *)
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278 SDL_malloc((sizeof *this->hidden));
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279 if (this->hidden == NULL) {
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280 SDL_OutOfMemory();
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281 return 0;
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282 }
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283 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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284
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285 if (LoadARTSLibrary() < 0) {
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286 ARTS_CloseDevice(this);
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287 SDL_SetError("ARTS: failed to load library: %s", SDL_GetError());
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288 return 0;
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289 }
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290
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291 /* Try for a closest match on audio format */
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292 for (test_format = SDL_FirstAudioFormat(this->spec.format);
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293 !format && test_format;) {
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294 #ifdef DEBUG_AUDIO
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295 fprintf(stderr, "Trying format 0x%4.4x\n", test_format);
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296 #endif
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297 switch (test_format) {
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298 case AUDIO_U8:
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299 bits = 8;
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300 format = 1;
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301 break;
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302 case AUDIO_S16LSB:
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303 bits = 16;
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304 format = 1;
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305 break;
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306 default:
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307 format = 0;
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308 break;
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309 }
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310 if (!format) {
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311 test_format = SDL_NextAudioFormat();
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312 }
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313 }
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314 if (format == 0) {
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315 ARTS_CloseDevice(this);
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316 SDL_SetError("Couldn't find any hardware audio formats");
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317 return 0;
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318 }
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319 this->spec.format = test_format;
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320
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321 if ((rc = SDL_NAME(arts_init) ()) != 0) {
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322 ARTS_CloseDevice(this);
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323 SDL_SetError( "Unable to initialize ARTS: %s",
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324 SDL_NAME(arts_error_text)(rc) );
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325 return 0;
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326 }
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327 this->hidden->stream = SDL_NAME(arts_play_stream) (
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diff changeset
328 this->spec.freq,
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diff changeset
329 bits, this->spec.channels,
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330 "SDL");
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331
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332 /* Calculate the final parameters for this audio specification */
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333 SDL_CalculateAudioSpec(&this->spec);
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334
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335 /* Determine the power of two of the fragment size */
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336 for (frag_spec = 0; (0x01 << frag_spec) < this->spec.size; ++frag_spec);
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337 if ((0x01 << frag_spec) != this->spec.size) {
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338 ARTS_CloseDevice(this);
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339 SDL_SetError("Fragment size must be a power of two");
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340 return 0;
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341 }
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342 frag_spec |= 0x00020000; /* two fragments, for low latency */
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343
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344 #ifdef ARTS_P_PACKET_SETTINGS
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345 SDL_NAME(arts_stream_set) (this->hidden->stream,
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346 ARTS_P_PACKET_SETTINGS, frag_spec);
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347 #else
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348 SDL_NAME(arts_stream_set) (this->hidden->stream, ARTS_P_PACKET_SIZE,
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349 frag_spec & 0xffff);
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diff changeset
350 SDL_NAME(arts_stream_set) (this->hidden->stream, ARTS_P_PACKET_COUNT,
35d1367020a3 Updated arts driver for 1.3 audio API.
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diff changeset
351 frag_spec >> 16);
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diff changeset
352 #endif
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diff changeset
353 this->spec.size = SDL_NAME(arts_stream_get) (this->hidden->stream,
35d1367020a3 Updated arts driver for 1.3 audio API.
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diff changeset
354 ARTS_P_PACKET_SIZE);
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diff changeset
355
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356 /* Allocate mixing buffer */
3812
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diff changeset
357 this->hidden->mixlen = this->spec.size;
35d1367020a3 Updated arts driver for 1.3 audio API.
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diff changeset
358 this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen);
35d1367020a3 Updated arts driver for 1.3 audio API.
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diff changeset
359 if (this->hidden->mixbuf == NULL) {
35d1367020a3 Updated arts driver for 1.3 audio API.
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diff changeset
360 ARTS_CloseDevice(this);
35d1367020a3 Updated arts driver for 1.3 audio API.
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diff changeset
361 SDL_OutOfMemory();
35d1367020a3 Updated arts driver for 1.3 audio API.
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diff changeset
362 return 0;
1895
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diff changeset
363 }
3812
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diff changeset
364 SDL_memset(this->hidden->mixbuf, this->spec.silence, this->spec.size);
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parents:
diff changeset
365
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diff changeset
366 /* Get the parent process id (we're the parent of the audio thread) */
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diff changeset
367 this->hidden->parent = getpid();
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diff changeset
368
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parents: 1402
diff changeset
369 /* We're ready to rock and roll. :-) */
3812
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diff changeset
370 return 1;
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diff changeset
371 }
1895
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diff changeset
372
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
373 /* vi: set ts=4 sw=4 expandtab: */