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annotate src/audio/arts/SDL_artsaudio.c @ 3842:6b04ca2f1016 SDL-ryan-multiple-audio-device

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Moved DirectSound audio target to SDL 1.3 API and did some house cleaning.
author Ryan C. Gordon <icculus@icculus.org>
date Tue, 17 Oct 2006 06:37:42 +0000
parents 9d070c1a45fa
children 66fb40445587
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 #ifdef SDL_AUDIO_DRIVER_ARTS_DYNAMIC
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43
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44 static const char *arts_library = SDL_AUDIO_DRIVER_ARTS_DYNAMIC;
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45 static void *arts_handle = NULL;
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46
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47 /* !!! FIXME: I hate this SDL_NAME clutter...it makes everything so messy! */
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48 static int (*SDL_NAME(arts_init)) (void);
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49 static void (*SDL_NAME(arts_free)) (void);
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50 static arts_stream_t(*SDL_NAME(arts_play_stream)) (int rate, int bits,
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51 int channels,
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52 const char *name);
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53 static int (*SDL_NAME(arts_stream_set)) (arts_stream_t s,
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54 arts_parameter_t param, int value);
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55 static int (*SDL_NAME(arts_stream_get)) (arts_stream_t s,
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56 arts_parameter_t param);
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57 static int (*SDL_NAME(arts_write)) (arts_stream_t s, const void *buffer,
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58 int count);
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59 static void (*SDL_NAME(arts_close_stream)) (arts_stream_t s);
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60 static void (*SDL_NAME(arts_close_stream)) (arts_stream_t s);
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61 static const char *(*SDL_NAME(arts_error_text)) (int errorcode);
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62
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63 #define SDL_ARTS_SYM(x) { #x, (void **) (char *) &SDL_NAME(x) }
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64 static struct
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65 {
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66 const char *name;
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67 void **func;
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68 } arts_functions[] = {
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69 SDL_ARTS_SYM(arts_init),
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70 SDL_ARTS_SYM(arts_free),
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71 SDL_ARTS_SYM(arts_play_stream),
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72 SDL_ARTS_SYM(arts_stream_set),
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73 SDL_ARTS_SYM(arts_stream_get),
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74 SDL_ARTS_SYM(arts_write),
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75 SDL_ARTS_SYM(arts_close_stream),
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76 SDL_ARTS_SYM(arts_error_text),
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77 };
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78 #undef SDL_ARTS_SYM
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79
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80 static void
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81 UnloadARTSLibrary()
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82 {
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83 if (arts_handle != NULL) {
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84 SDL_UnloadObject(arts_handle);
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85 arts_handle = NULL;
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86 }
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87 }
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88
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89 static int
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90 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 if (arts_handle == NULL) {
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95 arts_handle = SDL_LoadObject(arts_library);
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96 if (arts_handle != NULL) {
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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 =
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100 SDL_LoadFunction(arts_handle, arts_functions[i].name);
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101 if (!*arts_functions[i].func) {
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102 retval = -1;
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103 UnloadARTSLibrary();
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104 break;
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105 }
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106 }
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107 }
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108 }
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109
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110 return retval;
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111 }
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112
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113 #else
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114
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115 static void
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116 UnloadARTSLibrary()
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117 {
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118 return;
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119 }
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120
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121 static int
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122 LoadARTSLibrary(void)
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123 {
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124 return 0;
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125 }
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126
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127 #endif /* SDL_AUDIO_DRIVER_ARTS_DYNAMIC */
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128
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129 /* Audio driver bootstrap functions */
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130
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131 static int
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132 ARTS_Available(void)
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133 {
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134 int available = 0;
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135
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136 if (LoadARTSLibrary() == 0) {
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137 if (SDL_NAME(arts_init) () == 0) {
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138 #define ARTS_CRASH_HACK /* Play a stream so aRts doesn't crash */
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139 #ifdef ARTS_CRASH_HACK
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140 arts_stream_t stream;
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141 stream = SDL_NAME(arts_play_stream) (44100, 16, 2, "SDL");
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142 SDL_NAME(arts_write) (stream, "", 0);
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143 SDL_NAME(arts_close_stream) (stream);
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144 #endif
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145 available = 1;
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146 SDL_NAME(arts_free) ();
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147 }
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148 UnloadARTSLibrary();
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149 }
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583a07ab5444 Doh! Patch by Joel Ray Holveck
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150
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151 return available;
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152 }
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153
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154
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155 /* This function waits until it is possible to write a full sound buffer */
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156 static void
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157 ARTS_WaitDevice(_THIS)
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158 {
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159 Sint32 ticks;
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160
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161 /* Check to see if the thread-parent process is still alive */
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162 {
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163 static int cnt = 0;
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164 /* Note that this only works with thread implementations
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165 that use a different process id for each thread.
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166 */
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167 /* Check every 10 loops */
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168 if (this->hidden->parent && (((++cnt) % 10) == 0)) {
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169 if (kill(this->hidden->parent, 0) < 0) {
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170 this->enabled = 0;
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171 }
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172 }
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173 }
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174
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175 /* Use timer for general audio synchronization */
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176 ticks = ((Sint32) (this->hidden->next_frame-SDL_GetTicks())) - FUDGE_TICKS;
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177 if (ticks > 0) {
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178 SDL_Delay(ticks);
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179 }
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180 }
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181
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182 static void
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183 ARTS_PlayDevice(_THIS)
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184 {
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185 /* Write the audio data */
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186 int written = SDL_NAME(arts_write) (
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187 this->hidden->stream,
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188 this->hidden->mixbuf,
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189 this->hidden->mixlen);
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190
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191 /* If timer synchronization is enabled, set the next write frame */
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192 if (this->hidden->frame_ticks) {
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193 this->hidden->next_frame += this->hidden->frame_ticks;
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194 }
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195
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196 /* If we couldn't write, assume fatal error for now */
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197 if (written < 0) {
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198 this->enabled = 0;
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199 }
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200 #ifdef DEBUG_AUDIO
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201 fprintf(stderr, "Wrote %d bytes of audio data\n", written);
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202 #endif
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203 }
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204
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205 static void
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206 ARTS_WaitDone(_THIS)
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207 {
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208 /* !!! FIXME: camp here until buffer drains... SDL_Delay(???); */
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209 }
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210
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211
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212 static Uint8 *
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213 ARTS_GetDeviceBuf(_THIS)
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214 {
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215 return (this->hidden->mixbuf);
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216 }
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217
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218
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219 static void
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220 ARTS_CloseDevice(_THIS)
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221 {
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222 if (this->hidden != NULL) {
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223 if (this->hidden->mixbuf != NULL) {
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224 SDL_FreeAudioMem(this->hidden->mixbuf);
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225 this->hidden->mixbuf = NULL;
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226 }
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227 if (this->hidden->stream) {
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228 SDL_NAME(arts_close_stream) (this->hidden->stream);
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229 this->hidden->stream = 0;
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230 }
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231 SDL_NAME(arts_free) ();
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232 SDL_free(this->hidden);
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233 this->hidden = NULL;
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234 }
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235 UnloadARTSLibrary();
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236 }
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237
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238
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239 static int
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240 ARTS_OpenDevice(_THIS, const char *devname, int iscapture)
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241 {
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242 int rc = 0;
3814
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243 int bits = 0, frag_spec = 0;
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244 SDL_AudioFormat test_format = 0, format = 0;
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245
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246 /* Initialize all variables that we clean on shutdown */
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247 this->hidden = (struct SDL_PrivateAudioData *)
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248 SDL_malloc((sizeof *this->hidden));
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249 if (this->hidden == NULL) {
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250 SDL_OutOfMemory();
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251 return 0;
35d1367020a3 Updated arts driver for 1.3 audio API.
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diff changeset
252 }
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253 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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254
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255 if (LoadARTSLibrary() < 0) {
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256 ARTS_CloseDevice(this);
35d1367020a3 Updated arts driver for 1.3 audio API.
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257 SDL_SetError("ARTS: failed to load library: %s", SDL_GetError());
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258 return 0;
35d1367020a3 Updated arts driver for 1.3 audio API.
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259 }
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260
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261 /* Try for a closest match on audio format */
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262 for (test_format = SDL_FirstAudioFormat(this->spec.format);
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263 !format && test_format;) {
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264 #ifdef DEBUG_AUDIO
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265 fprintf(stderr, "Trying format 0x%4.4x\n", test_format);
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266 #endif
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267 switch (test_format) {
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268 case AUDIO_U8:
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269 bits = 8;
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270 format = 1;
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271 break;
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diff changeset
272 case AUDIO_S16LSB:
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273 bits = 16;
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274 format = 1;
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275 break;
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276 default:
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277 format = 0;
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278 break;
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279 }
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280 if (!format) {
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281 test_format = SDL_NextAudioFormat();
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282 }
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283 }
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284 if (format == 0) {
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285 ARTS_CloseDevice(this);
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286 SDL_SetError("Couldn't find any hardware audio formats");
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287 return 0;
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288 }
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289 this->spec.format = test_format;
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290
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291 if ((rc = SDL_NAME(arts_init) ()) != 0) {
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292 ARTS_CloseDevice(this);
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293 SDL_SetError( "Unable to initialize ARTS: %s",
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294 SDL_NAME(arts_error_text)(rc) );
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295 return 0;
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296 }
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297 this->hidden->stream = SDL_NAME(arts_play_stream) (
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298 this->spec.freq,
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299 bits, this->spec.channels,
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300 "SDL");
0
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301
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302 /* Calculate the final parameters for this audio specification */
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303 SDL_CalculateAudioSpec(&this->spec);
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304
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305 /* Determine the power of two of the fragment size */
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306 for (frag_spec = 0; (0x01 << frag_spec) < this->spec.size; ++frag_spec);
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307 if ((0x01 << frag_spec) != this->spec.size) {
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308 ARTS_CloseDevice(this);
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309 SDL_SetError("Fragment size must be a power of two");
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310 return 0;
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311 }
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312 frag_spec |= 0x00020000; /* two fragments, for low latency */
0
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313
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314 #ifdef ARTS_P_PACKET_SETTINGS
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315 SDL_NAME(arts_stream_set) (this->hidden->stream,
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316 ARTS_P_PACKET_SETTINGS, frag_spec);
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317 #else
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318 SDL_NAME(arts_stream_set) (this->hidden->stream, ARTS_P_PACKET_SIZE,
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319 frag_spec & 0xffff);
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diff changeset
320 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
321 frag_spec >> 16);
0
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diff changeset
322 #endif
3812
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diff changeset
323 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
324 ARTS_P_PACKET_SIZE);
0
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diff changeset
325
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326 /* Allocate mixing buffer */
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327 this->hidden->mixlen = this->spec.size;
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328 this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen);
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diff changeset
329 if (this->hidden->mixbuf == NULL) {
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diff changeset
330 ARTS_CloseDevice(this);
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diff changeset
331 SDL_OutOfMemory();
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332 return 0;
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333 }
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diff changeset
334 SDL_memset(this->hidden->mixbuf, this->spec.silence, this->spec.size);
0
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parents:
diff changeset
335
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diff changeset
336 /* Get the parent process id (we're the parent of the audio thread) */
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diff changeset
337 this->hidden->parent = getpid();
0
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diff changeset
338
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diff changeset
339 /* We're ready to rock and roll. :-) */
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diff changeset
340 return 1;
0
74212992fb08 Initial revision
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diff changeset
341 }
1895
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parents: 1402
diff changeset
342
3816
9d070c1a45fa Moved AudioBootstrap section in converted drivers to bottom of source, so I
Ryan C. Gordon <icculus@icculus.org>
parents: 3814
diff changeset
343
9d070c1a45fa Moved AudioBootstrap section in converted drivers to bottom of source, so I
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
344 static int
9d070c1a45fa Moved AudioBootstrap section in converted drivers to bottom of source, so I
Ryan C. Gordon <icculus@icculus.org>
parents: 3814
diff changeset
345 ARTS_Init(SDL_AudioDriverImpl *impl)
9d070c1a45fa Moved AudioBootstrap section in converted drivers to bottom of source, so I
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parents: 3814
diff changeset
346 {
9d070c1a45fa Moved AudioBootstrap section in converted drivers to bottom of source, so I
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parents: 3814
diff changeset
347 /* Set the function pointers */
9d070c1a45fa Moved AudioBootstrap section in converted drivers to bottom of source, so I
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diff changeset
348 impl->OpenDevice = ARTS_OpenDevice;
9d070c1a45fa Moved AudioBootstrap section in converted drivers to bottom of source, so I
Ryan C. Gordon <icculus@icculus.org>
parents: 3814
diff changeset
349 impl->PlayDevice = ARTS_PlayDevice;
9d070c1a45fa Moved AudioBootstrap section in converted drivers to bottom of source, so I
Ryan C. Gordon <icculus@icculus.org>
parents: 3814
diff changeset
350 impl->WaitDevice = ARTS_WaitDevice;
9d070c1a45fa Moved AudioBootstrap section in converted drivers to bottom of source, so I
Ryan C. Gordon <icculus@icculus.org>
parents: 3814
diff changeset
351 impl->GetDeviceBuf = ARTS_GetDeviceBuf;
9d070c1a45fa Moved AudioBootstrap section in converted drivers to bottom of source, so I
Ryan C. Gordon <icculus@icculus.org>
parents: 3814
diff changeset
352 impl->CloseDevice = ARTS_CloseDevice;
9d070c1a45fa Moved AudioBootstrap section in converted drivers to bottom of source, so I
Ryan C. Gordon <icculus@icculus.org>
parents: 3814
diff changeset
353 impl->WaitDone = ARTS_WaitDone;
9d070c1a45fa Moved AudioBootstrap section in converted drivers to bottom of source, so I
Ryan C. Gordon <icculus@icculus.org>
parents: 3814
diff changeset
354 impl->OnlyHasDefaultOutputDevice = 1;
9d070c1a45fa Moved AudioBootstrap section in converted drivers to bottom of source, so I
Ryan C. Gordon <icculus@icculus.org>
parents: 3814
diff changeset
355
9d070c1a45fa Moved AudioBootstrap section in converted drivers to bottom of source, so I
Ryan C. Gordon <icculus@icculus.org>
parents: 3814
diff changeset
356 return 1;
9d070c1a45fa Moved AudioBootstrap section in converted drivers to bottom of source, so I
Ryan C. Gordon <icculus@icculus.org>
parents: 3814
diff changeset
357 }
9d070c1a45fa Moved AudioBootstrap section in converted drivers to bottom of source, so I
Ryan C. Gordon <icculus@icculus.org>
parents: 3814
diff changeset
358
9d070c1a45fa Moved AudioBootstrap section in converted drivers to bottom of source, so I
Ryan C. Gordon <icculus@icculus.org>
parents: 3814
diff changeset
359
9d070c1a45fa Moved AudioBootstrap section in converted drivers to bottom of source, so I
Ryan C. Gordon <icculus@icculus.org>
parents: 3814
diff changeset
360 AudioBootStrap ARTS_bootstrap = {
9d070c1a45fa Moved AudioBootstrap section in converted drivers to bottom of source, so I
Ryan C. Gordon <icculus@icculus.org>
parents: 3814
diff changeset
361 ARTS_DRIVER_NAME, "Analog RealTime Synthesizer",
9d070c1a45fa Moved AudioBootstrap section in converted drivers to bottom of source, so I
Ryan C. Gordon <icculus@icculus.org>
parents: 3814
diff changeset
362 ARTS_Available, ARTS_Init, 0
9d070c1a45fa Moved AudioBootstrap section in converted drivers to bottom of source, so I
Ryan C. Gordon <icculus@icculus.org>
parents: 3814
diff changeset
363 };
9d070c1a45fa Moved AudioBootstrap section in converted drivers to bottom of source, so I
Ryan C. Gordon <icculus@icculus.org>
parents: 3814
diff changeset
364
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1402
diff changeset
365 /* vi: set ts=4 sw=4 expandtab: */