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annotate src/audio/arts/SDL_artsaudio.c @ 4724:d86332c0fb9b

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Working on the sound system
author Paul Hunkin <paul@bieh.net>
date Sat, 14 Aug 2010 12:35:21 +1200
parents 4160ba33b597
children b530ef003506
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2010 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 #ifdef HAVE_SIGNAL_H
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27 #include <signal.h>
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28 #endif
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29 #include <unistd.h>
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30 #include <errno.h>
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31
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32 #include "SDL_timer.h"
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33 #include "SDL_audio.h"
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34 #include "../SDL_audiomem.h"
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35 #include "../SDL_audio_c.h"
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36 #include "SDL_artsaudio.h"
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37
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38 #ifdef SDL_AUDIO_DRIVER_ARTS_DYNAMIC
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39 #include "SDL_name.h"
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40 #include "SDL_loadso.h"
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41 #else
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42 #define SDL_NAME(X) X
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43 #endif
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44
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45 /* The tag name used by artsc audio */
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46 #define ARTS_DRIVER_NAME "arts"
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47
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48 #ifdef SDL_AUDIO_DRIVER_ARTS_DYNAMIC
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49
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50 static const char *arts_library = SDL_AUDIO_DRIVER_ARTS_DYNAMIC;
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51 static void *arts_handle = NULL;
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52
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53 /* !!! FIXME: I hate this SDL_NAME clutter...it makes everything so messy! */
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54 static int (*SDL_NAME(arts_init)) (void);
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55 static void (*SDL_NAME(arts_free)) (void);
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56 static arts_stream_t(*SDL_NAME(arts_play_stream)) (int rate, int bits,
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57 int channels,
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58 const char *name);
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59 static int (*SDL_NAME(arts_stream_set)) (arts_stream_t s,
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60 arts_parameter_t param, int value);
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61 static int (*SDL_NAME(arts_stream_get)) (arts_stream_t s,
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62 arts_parameter_t param);
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63 static int (*SDL_NAME(arts_write)) (arts_stream_t s, const void *buffer,
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64 int count);
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65 static void (*SDL_NAME(arts_close_stream)) (arts_stream_t s);
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66 static int (*SDL_NAME(arts_suspended)) (void);
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67 static const char *(*SDL_NAME(arts_error_text)) (int errorcode);
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68
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69 #define SDL_ARTS_SYM(x) { #x, (void **) (char *) &SDL_NAME(x) }
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70 static struct
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71 {
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72 const char *name;
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73 void **func;
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74 } arts_functions[] = {
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75 /* *INDENT-OFF* */
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76 SDL_ARTS_SYM(arts_init),
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77 SDL_ARTS_SYM(arts_free),
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78 SDL_ARTS_SYM(arts_play_stream),
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79 SDL_ARTS_SYM(arts_stream_set),
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80 SDL_ARTS_SYM(arts_stream_get),
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81 SDL_ARTS_SYM(arts_write),
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82 SDL_ARTS_SYM(arts_close_stream),
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83 SDL_ARTS_SYM(arts_suspended),
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84 SDL_ARTS_SYM(arts_error_text),
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85 /* *INDENT-ON* */
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86 };
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87
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88 #undef SDL_ARTS_SYM
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89
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90 static void
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91 UnloadARTSLibrary()
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92 {
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93 if (arts_handle != NULL) {
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94 SDL_UnloadObject(arts_handle);
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95 arts_handle = NULL;
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96 }
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97 }
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98
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99 static int
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100 LoadARTSLibrary(void)
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101 {
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102 int i, retval = -1;
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103
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104 if (arts_handle == NULL) {
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105 arts_handle = SDL_LoadObject(arts_library);
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106 if (arts_handle != NULL) {
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107 retval = 0;
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108 for (i = 0; i < SDL_arraysize(arts_functions); ++i) {
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109 *arts_functions[i].func =
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110 SDL_LoadFunction(arts_handle, arts_functions[i].name);
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111 if (!*arts_functions[i].func) {
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112 retval = -1;
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113 UnloadARTSLibrary();
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114 break;
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115 }
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116 }
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117 }
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118 }
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119
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120 return retval;
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121 }
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122
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123 #else
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124
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125 static void
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126 UnloadARTSLibrary()
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127 {
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128 return;
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129 }
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130
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131 static int
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132 LoadARTSLibrary(void)
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133 {
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134 return 0;
294
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135 }
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136
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137 #endif /* SDL_AUDIO_DRIVER_ARTS_DYNAMIC */
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138
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139 /* This function waits until it is possible to write a full sound buffer */
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140 static void
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141 ARTS_WaitDevice(_THIS)
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142 {
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143 Sint32 ticks;
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144
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145 /* Check to see if the thread-parent process is still alive */
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146 {
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147 static int cnt = 0;
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148 /* Note that this only works with thread implementations
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149 that use a different process id for each thread.
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150 */
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151 /* Check every 10 loops */
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152 if (this->hidden->parent && (((++cnt) % 10) == 0)) {
3068
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153 if (kill(this->hidden->parent, 0) < 0 && errno == ESRCH) {
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154 this->enabled = 0;
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155 }
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156 }
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157 }
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158
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159 /* Use timer for general audio synchronization */
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160 ticks =
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161 ((Sint32) (this->hidden->next_frame - SDL_GetTicks())) - FUDGE_TICKS;
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162 if (ticks > 0) {
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163 SDL_Delay(ticks);
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164 }
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165 }
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166
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167 static void
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168 ARTS_PlayDevice(_THIS)
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169 {
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170 /* Write the audio data */
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171 int written = SDL_NAME(arts_write) (this->hidden->stream,
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172 this->hidden->mixbuf,
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173 this->hidden->mixlen);
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174
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175 /* If timer synchronization is enabled, set the next write frame */
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176 if (this->hidden->frame_ticks) {
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177 this->hidden->next_frame += this->hidden->frame_ticks;
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178 }
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179
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180 /* If we couldn't write, assume fatal error for now */
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181 if (written < 0) {
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182 this->enabled = 0;
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183 }
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184 #ifdef DEBUG_AUDIO
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185 fprintf(stderr, "Wrote %d bytes of audio data\n", written);
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186 #endif
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187 }
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188
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189 static void
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190 ARTS_WaitDone(_THIS)
0
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191 {
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192 /* !!! FIXME: camp here until buffer drains... SDL_Delay(???); */
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193 }
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194
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195
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diff changeset
196 static Uint8 *
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diff changeset
197 ARTS_GetDeviceBuf(_THIS)
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198 {
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diff changeset
199 return (this->hidden->mixbuf);
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200 }
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201
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202
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203 static void
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204 ARTS_CloseDevice(_THIS)
0
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205 {
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206 if (this->hidden != NULL) {
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diff changeset
207 if (this->hidden->mixbuf != NULL) {
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diff changeset
208 SDL_FreeAudioMem(this->hidden->mixbuf);
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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diff changeset
209 this->hidden->mixbuf = NULL;
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210 }
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diff changeset
211 if (this->hidden->stream) {
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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diff changeset
212 SDL_NAME(arts_close_stream) (this->hidden->stream);
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diff changeset
213 this->hidden->stream = 0;
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214 }
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diff changeset
215 SDL_NAME(arts_free) ();
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diff changeset
216 SDL_free(this->hidden);
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diff changeset
217 this->hidden = NULL;
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218 }
0
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219 }
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220
2049
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diff changeset
221
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diff changeset
222 static int
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diff changeset
223 ARTS_OpenDevice(_THIS, const char *devname, int iscapture)
0
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diff changeset
224 {
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diff changeset
225 int rc = 0;
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diff changeset
226 int bits = 0, frag_spec = 0;
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diff changeset
227 SDL_AudioFormat test_format = 0, format = 0;
0
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228
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diff changeset
229 /* Initialize all variables that we clean on shutdown */
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diff changeset
230 this->hidden = (struct SDL_PrivateAudioData *)
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231 SDL_malloc((sizeof *this->hidden));
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diff changeset
232 if (this->hidden == NULL) {
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diff changeset
233 SDL_OutOfMemory();
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diff changeset
234 return 0;
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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diff changeset
235 }
5f6550e5184f Merged SDL-ryan-multiple-audio-device branch r2803:2871 into the trunk.
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diff changeset
236 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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237
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diff changeset
238 /* Try for a closest match on audio format */
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diff changeset
239 for (test_format = SDL_FirstAudioFormat(this->spec.format);
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240 !format && test_format;) {
0
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diff changeset
241 #ifdef DEBUG_AUDIO
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242 fprintf(stderr, "Trying format 0x%4.4x\n", test_format);
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243 #endif
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244 switch (test_format) {
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245 case AUDIO_U8:
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246 bits = 8;
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247 format = 1;
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248 break;
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diff changeset
249 case AUDIO_S16LSB:
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250 bits = 16;
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251 format = 1;
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diff changeset
252 break;
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diff changeset
253 default:
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254 format = 0;
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diff changeset
255 break;
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diff changeset
256 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
257 if (!format) {
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diff changeset
258 test_format = SDL_NextAudioFormat();
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259 }
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diff changeset
260 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
261 if (format == 0) {
2049
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262 ARTS_CloseDevice(this);
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263 SDL_SetError("Couldn't find any hardware audio formats");
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264 return 0;
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265 }
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266 this->spec.format = test_format;
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267
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268 if ((rc = SDL_NAME(arts_init) ()) != 0) {
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269 ARTS_CloseDevice(this);
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270 SDL_SetError("Unable to initialize ARTS: %s",
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271 SDL_NAME(arts_error_text) (rc));
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272 return 0;
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273 }
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274
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275 if (!SDL_NAME(arts_suspended) ()) {
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276 ARTS_CloseDevice(this);
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277 SDL_SetError("ARTS can not open audio device");
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278 return 0;
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279 }
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280
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281 this->hidden->stream = SDL_NAME(arts_play_stream) (this->spec.freq,
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282 bits,
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283 this->spec.channels,
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284 "SDL");
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285
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286 /* Play nothing so we have at least one write (server bug workaround). */
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287 SDL_NAME(arts_write) (this->hidden->stream, "", 0);
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288
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289 /* Calculate the final parameters for this audio specification */
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290 SDL_CalculateAudioSpec(&this->spec);
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291
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292 /* Determine the power of two of the fragment size */
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293 for (frag_spec = 0; (0x01 << frag_spec) < this->spec.size; ++frag_spec);
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294 if ((0x01 << frag_spec) != this->spec.size) {
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295 ARTS_CloseDevice(this);
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296 SDL_SetError("Fragment size must be a power of two");
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297 return 0;
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298 }
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299 frag_spec |= 0x00020000; /* two fragments, for low latency */
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300
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301 #ifdef ARTS_P_PACKET_SETTINGS
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302 SDL_NAME(arts_stream_set) (this->hidden->stream,
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303 ARTS_P_PACKET_SETTINGS, frag_spec);
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304 #else
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305 SDL_NAME(arts_stream_set) (this->hidden->stream, ARTS_P_PACKET_SIZE,
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306 frag_spec & 0xffff);
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diff changeset
307 SDL_NAME(arts_stream_set) (this->hidden->stream, ARTS_P_PACKET_COUNT,
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diff changeset
308 frag_spec >> 16);
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309 #endif
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310 this->spec.size = SDL_NAME(arts_stream_get) (this->hidden->stream,
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diff changeset
311 ARTS_P_PACKET_SIZE);
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312
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313 /* Allocate mixing buffer */
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diff changeset
314 this->hidden->mixlen = this->spec.size;
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diff changeset
315 this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen);
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diff changeset
316 if (this->hidden->mixbuf == NULL) {
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diff changeset
317 ARTS_CloseDevice(this);
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diff changeset
318 SDL_OutOfMemory();
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diff changeset
319 return 0;
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320 }
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diff changeset
321 SDL_memset(this->hidden->mixbuf, this->spec.silence, this->spec.size);
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322
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323 /* Get the parent process id (we're the parent of the audio thread) */
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324 this->hidden->parent = getpid();
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325
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326 /* We're ready to rock and roll. :-) */
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327 return 1;
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328 }
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329
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330
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diff changeset
331 static void
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diff changeset
332 ARTS_Deinitialize(void)
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333 {
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diff changeset
334 UnloadARTSLibrary();
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335 }
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336
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337
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338 static int
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339 ARTS_Init(SDL_AudioDriverImpl * impl)
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340 {
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diff changeset
341 if (LoadARTSLibrary() < 0) {
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342 return 0;
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343 } else {
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344 if (SDL_NAME(arts_init) () != 0) {
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345 UnloadARTSLibrary();
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diff changeset
346 SDL_SetError("ARTS: arts_init failed (no audio server?)");
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diff changeset
347 return 0;
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diff changeset
348 }
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349
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diff changeset
350 /* Play a stream so aRts doesn't crash */
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351 if (SDL_NAME(arts_suspended) ()) {
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352 arts_stream_t stream;
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diff changeset
353 stream = SDL_NAME(arts_play_stream) (44100, 16, 2, "SDL");
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diff changeset
354 SDL_NAME(arts_write) (stream, "", 0);
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diff changeset
355 SDL_NAME(arts_close_stream) (stream);
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diff changeset
356 }
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357
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diff changeset
358 SDL_NAME(arts_free) ();
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359 }
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diff changeset
360
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diff changeset
361 /* Set the function pointers */
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diff changeset
362 impl->OpenDevice = ARTS_OpenDevice;
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diff changeset
363 impl->PlayDevice = ARTS_PlayDevice;
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diff changeset
364 impl->WaitDevice = ARTS_WaitDevice;
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diff changeset
365 impl->GetDeviceBuf = ARTS_GetDeviceBuf;
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diff changeset
366 impl->CloseDevice = ARTS_CloseDevice;
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diff changeset
367 impl->WaitDone = ARTS_WaitDone;
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diff changeset
368 impl->Deinitialize = ARTS_Deinitialize;
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diff changeset
369 impl->OnlyHasDefaultOutputDevice = 1;
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diff changeset
370
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diff changeset
371 return 1; /* this audio target is available. */
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372 }
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373
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374
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diff changeset
375 AudioBootStrap ARTS_bootstrap = {
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diff changeset
376 ARTS_DRIVER_NAME, "Analog RealTime Synthesizer", ARTS_Init, 0
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377 };
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378
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379 /* vi: set ts=4 sw=4 expandtab: */