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annotate src/audio/arts/SDL_artsaudio.c @ 1662:782fd950bd46 SDL-1.3

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Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API. WARNING: None of the video drivers have been updated for the new API yet! The API is still under design and very fluid. The code is now run through a consistent indent format: indent -i4 -nut -nsc -br -ce The headers are being converted to automatically generate doxygen documentation.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 28 May 2006 13:04:16 +0000
parents d910939febfa
children 4da1ee79c9af
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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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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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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,
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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
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69 static struct
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70 {
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71 const char *name;
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72 void **func;
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73 } arts_functions[] = {
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74 {
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75 "arts_init", (void **) &SDL_NAME (arts_init)}, {
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76 "arts_free", (void **) &SDL_NAME (arts_free)}, {
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77 "arts_play_stream", (void **) &SDL_NAME (arts_play_stream)}, {
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78 "arts_stream_set", (void **) &SDL_NAME (arts_stream_set)}, {
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79 "arts_stream_get", (void **) &SDL_NAME (arts_stream_get)}, {
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80 "arts_write", (void **) &SDL_NAME (arts_write)}, {
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81 "arts_close_stream", (void **) &SDL_NAME (arts_close_stream)},};
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82
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83 static void
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84 UnloadARTSLibrary ()
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85 {
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86 if (arts_loaded) {
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87 SDL_UnloadObject (arts_handle);
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88 arts_handle = NULL;
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89 arts_loaded = 0;
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90 }
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91 }
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92
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93 static int
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94 LoadARTSLibrary (void)
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95 {
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96 int i, retval = -1;
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97
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98 arts_handle = SDL_LoadObject (arts_library);
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99 if (arts_handle) {
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100 arts_loaded = 1;
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101 retval = 0;
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102 for (i = 0; i < SDL_arraysize (arts_functions); ++i) {
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103 *arts_functions[i].func =
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104 SDL_LoadFunction (arts_handle, arts_functions[i].name);
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105 if (!*arts_functions[i].func) {
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106 retval = -1;
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107 UnloadARTSLibrary ();
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108 break;
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109 }
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110 }
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111 }
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112 return retval;
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113 }
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114
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115 #else
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116
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117 static void
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118 UnloadARTSLibrary ()
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119 {
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120 return;
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121 }
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122
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123 static int
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124 LoadARTSLibrary (void)
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125 {
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126 return 0;
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127 }
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128
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129 #endif /* SDL_AUDIO_DRIVER_ARTS_DYNAMIC */
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130
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131 /* Audio driver bootstrap functions */
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132
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133 static int
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134 Audio_Available (void)
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135 {
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136 int available = 0;
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137
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138 if (LoadARTSLibrary () < 0) {
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139 return available;
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140 }
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141 if (SDL_NAME (arts_init) () == 0) {
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142 #define ARTS_CRASH_HACK /* Play a stream so aRts doesn't crash */
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143 #ifdef ARTS_CRASH_HACK
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144 arts_stream_t stream2;
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145 stream2 = SDL_NAME (arts_play_stream) (44100, 16, 2, "SDL");
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146 SDL_NAME (arts_write) (stream2, "", 0);
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147 SDL_NAME (arts_close_stream) (stream2);
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148 #endif
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149 available = 1;
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150 SDL_NAME (arts_free) ();
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151 }
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152 UnloadARTSLibrary ();
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153
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154 return available;
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155 }
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156
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157 static void
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158 Audio_DeleteDevice (SDL_AudioDevice * device)
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159 {
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160 SDL_free (device->hidden);
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161 SDL_free (device);
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162 UnloadARTSLibrary ();
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163 }
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164
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165 static SDL_AudioDevice *
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166 Audio_CreateDevice (int devindex)
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167 {
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168 SDL_AudioDevice *this;
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169
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170 /* Initialize all variables that we clean on shutdown */
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171 LoadARTSLibrary ();
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172 this = (SDL_AudioDevice *) SDL_malloc (sizeof (SDL_AudioDevice));
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173 if (this) {
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174 SDL_memset (this, 0, (sizeof *this));
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175 this->hidden = (struct SDL_PrivateAudioData *)
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176 SDL_malloc ((sizeof *this->hidden));
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177 }
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178 if ((this == NULL) || (this->hidden == NULL)) {
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179 SDL_OutOfMemory ();
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180 if (this) {
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181 SDL_free (this);
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182 }
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183 return (0);
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184 }
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185 SDL_memset (this->hidden, 0, (sizeof *this->hidden));
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186 stream = 0;
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187
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188 /* Set the function pointers */
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189 this->OpenAudio = ARTS_OpenAudio;
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190 this->WaitAudio = ARTS_WaitAudio;
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191 this->PlayAudio = ARTS_PlayAudio;
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192 this->GetAudioBuf = ARTS_GetAudioBuf;
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193 this->CloseAudio = ARTS_CloseAudio;
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194
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195 this->free = Audio_DeleteDevice;
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196
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197 return this;
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198 }
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199
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200 AudioBootStrap ARTS_bootstrap = {
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201 ARTS_DRIVER_NAME, "Analog Realtime Synthesizer",
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202 Audio_Available, Audio_CreateDevice
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203 };
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204
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205 /* This function waits until it is possible to write a full sound buffer */
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206 static void
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207 ARTS_WaitAudio (_THIS)
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208 {
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209 Sint32 ticks;
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210
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211 /* Check to see if the thread-parent process is still alive */
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212 {
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213 static int cnt = 0;
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214 /* Note that this only works with thread implementations
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215 that use a different process id for each thread.
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216 */
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217 if (parent && (((++cnt) % 10) == 0)) { /* Check every 10 loops */
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218 if (kill (parent, 0) < 0) {
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219 this->enabled = 0;
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220 }
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221 }
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222 }
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223
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224 /* Use timer for general audio synchronization */
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225 ticks = ((Sint32) (next_frame - SDL_GetTicks ())) - FUDGE_TICKS;
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226 if (ticks > 0) {
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227 SDL_Delay (ticks);
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228 }
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229 }
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230
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231 static void
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232 ARTS_PlayAudio (_THIS)
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233 {
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234 int written;
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235
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236 /* Write the audio data */
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237 written = SDL_NAME (arts_write) (stream, mixbuf, mixlen);
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238
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239 /* If timer synchronization is enabled, set the next write frame */
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240 if (frame_ticks) {
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241 next_frame += frame_ticks;
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242 }
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243
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244 /* If we couldn't write, assume fatal error for now */
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245 if (written < 0) {
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246 this->enabled = 0;
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247 }
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248 #ifdef DEBUG_AUDIO
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249 fprintf (stderr, "Wrote %d bytes of audio data\n", written);
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250 #endif
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251 }
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252
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253 static Uint8 *
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254 ARTS_GetAudioBuf (_THIS)
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255 {
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256 return (mixbuf);
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257 }
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258
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259 static void
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260 ARTS_CloseAudio (_THIS)
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261 {
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262 if (mixbuf != NULL) {
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263 SDL_FreeAudioMem (mixbuf);
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264 mixbuf = NULL;
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265 }
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266 if (stream) {
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267 SDL_NAME (arts_close_stream) (stream);
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268 stream = 0;
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269 }
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270 SDL_NAME (arts_free) ();
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271 }
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272
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273 static int
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274 ARTS_OpenAudio (_THIS, SDL_AudioSpec * spec)
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275 {
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276 int bits, frag_spec;
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277 Uint16 test_format, format;
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278
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279 /* Reset the timer synchronization flag */
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280 frame_ticks = 0.0;
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281
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282 mixbuf = NULL;
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283
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284 /* Try for a closest match on audio format */
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285 format = 0;
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286 bits = 0;
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287 for (test_format = SDL_FirstAudioFormat (spec->format);
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288 !format && test_format;) {
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289 #ifdef DEBUG_AUDIO
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290 fprintf (stderr, "Trying format 0x%4.4x\n", test_format);
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291 #endif
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292 switch (test_format) {
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293 case AUDIO_U8:
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294 bits = 8;
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295 format = 1;
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296 break;
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297 case AUDIO_S16LSB:
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298 bits = 16;
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299 format = 1;
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300 break;
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301 default:
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302 format = 0;
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303 break;
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304 }
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305 if (!format) {
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306 test_format = SDL_NextAudioFormat ();
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307 }
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308 }
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309 if (format == 0) {
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310 SDL_SetError ("Couldn't find any hardware audio formats");
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311 return (-1);
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312 }
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313 spec->format = test_format;
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314
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315 if (SDL_NAME (arts_init) () != 0) {
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316 SDL_SetError ("Unable to initialize ARTS");
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317 return (-1);
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318 }
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319 stream =
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320 SDL_NAME (arts_play_stream) (spec->freq, bits, spec->channels, "SDL");
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321
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322 /* Calculate the final parameters for this audio specification */
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323 SDL_CalculateAudioSpec (spec);
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324
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325 /* Determine the power of two of the fragment size */
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326 for (frag_spec = 0; (0x01 << frag_spec) < spec->size; ++frag_spec);
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327 if ((0x01 << frag_spec) != spec->size) {
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328 SDL_SetError ("Fragment size must be a power of two");
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329 return (-1);
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330 }
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331 frag_spec |= 0x00020000; /* two fragments, for low latency */
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332
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333 #ifdef ARTS_P_PACKET_SETTINGS
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334 SDL_NAME (arts_stream_set) (stream, ARTS_P_PACKET_SETTINGS, frag_spec);
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335 #else
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336 SDL_NAME (arts_stream_set) (stream, ARTS_P_PACKET_SIZE,
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337 frag_spec & 0xffff);
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338 SDL_NAME (arts_stream_set) (stream, ARTS_P_PACKET_COUNT, frag_spec >> 16);
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339 #endif
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340 spec->size = SDL_NAME (arts_stream_get) (stream, ARTS_P_PACKET_SIZE);
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341
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342 /* Allocate mixing buffer */
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343 mixlen = spec->size;
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344 mixbuf = (Uint8 *) SDL_AllocAudioMem (mixlen);
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345 if (mixbuf == NULL) {
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346 return (-1);
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347 }
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348 SDL_memset (mixbuf, spec->silence, spec->size);
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349
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350 /* Get the parent process id (we're the parent of the audio thread) */
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351 parent = getpid ();
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352
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353 /* We're ready to rock and roll. :-) */
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354 return (0);
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355 }
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356
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357 /* vi: set ts=4 sw=4 expandtab: */