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annotate src/audio/arts/SDL_artsaudio.c @ 2060:866052b01ee5

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indent is evil
author Sam Lantinga <slouken@libsdl.org>
date Sat, 28 Oct 2006 16:48:03 +0000
parents 5f6550e5184f
children 85ed90a755fa
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), SDL_ARTS_SYM(arts_error_text),};
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76 #undef SDL_ARTS_SYM
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77
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78 static void
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79 UnloadARTSLibrary()
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80 {
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81 if (arts_handle != NULL) {
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82 SDL_UnloadObject(arts_handle);
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83 arts_handle = NULL;
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84 }
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85 }
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86
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87 static int
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88 LoadARTSLibrary(void)
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89 {
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90 int i, retval = -1;
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91
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92 if (arts_handle == NULL) {
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93 arts_handle = SDL_LoadObject(arts_library);
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94 if (arts_handle != NULL) {
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95 retval = 0;
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96 for (i = 0; i < SDL_arraysize(arts_functions); ++i) {
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97 *arts_functions[i].func =
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98 SDL_LoadFunction(arts_handle, arts_functions[i].name);
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99 if (!*arts_functions[i].func) {
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100 retval = -1;
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101 UnloadARTSLibrary();
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102 break;
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103 }
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104 }
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105 }
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106 }
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107
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108 return retval;
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109 }
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110
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111 #else
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112
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113 static void
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114 UnloadARTSLibrary()
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115 {
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116 return;
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117 }
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118
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119 static int
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120 LoadARTSLibrary(void)
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121 {
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122 return 0;
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123 }
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124
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125 #endif /* SDL_AUDIO_DRIVER_ARTS_DYNAMIC */
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126
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127 /* This function waits until it is possible to write a full sound buffer */
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128 static void
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129 ARTS_WaitDevice(_THIS)
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130 {
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131 Sint32 ticks;
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132
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133 /* Check to see if the thread-parent process is still alive */
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134 {
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135 static int cnt = 0;
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136 /* Note that this only works with thread implementations
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137 that use a different process id for each thread.
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138 */
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139 /* Check every 10 loops */
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140 if (this->hidden->parent && (((++cnt) % 10) == 0)) {
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diff changeset
141 if (kill(this->hidden->parent, 0) < 0) {
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142 this->enabled = 0;
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143 }
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144 }
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145 }
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146
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147 /* Use timer for general audio synchronization */
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148 ticks =
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149 ((Sint32) (this->hidden->next_frame - SDL_GetTicks())) - FUDGE_TICKS;
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150 if (ticks > 0) {
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151 SDL_Delay(ticks);
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152 }
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153 }
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154
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155 static void
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156 ARTS_PlayDevice(_THIS)
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157 {
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158 /* Write the audio data */
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159 int written = SDL_NAME(arts_write) (this->hidden->stream,
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160 this->hidden->mixbuf,
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161 this->hidden->mixlen);
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162
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163 /* If timer synchronization is enabled, set the next write frame */
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164 if (this->hidden->frame_ticks) {
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165 this->hidden->next_frame += this->hidden->frame_ticks;
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166 }
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167
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168 /* If we couldn't write, assume fatal error for now */
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169 if (written < 0) {
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170 this->enabled = 0;
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171 }
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172 #ifdef DEBUG_AUDIO
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173 fprintf(stderr, "Wrote %d bytes of audio data\n", written);
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174 #endif
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175 }
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176
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177 static void
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178 ARTS_WaitDone(_THIS)
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179 {
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180 /* !!! FIXME: camp here until buffer drains... SDL_Delay(???); */
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181 }
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182
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183
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diff changeset
184 static Uint8 *
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diff changeset
185 ARTS_GetDeviceBuf(_THIS)
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186 {
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diff changeset
187 return (this->hidden->mixbuf);
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188 }
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189
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190
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191 static void
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192 ARTS_CloseDevice(_THIS)
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193 {
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194 if (this->hidden != NULL) {
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195 if (this->hidden->mixbuf != NULL) {
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diff changeset
196 SDL_FreeAudioMem(this->hidden->mixbuf);
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197 this->hidden->mixbuf = NULL;
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198 }
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diff changeset
199 if (this->hidden->stream) {
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200 SDL_NAME(arts_close_stream) (this->hidden->stream);
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diff changeset
201 this->hidden->stream = 0;
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202 }
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diff changeset
203 SDL_NAME(arts_free) ();
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diff changeset
204 SDL_free(this->hidden);
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diff changeset
205 this->hidden = NULL;
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206 }
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207 }
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208
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diff changeset
209
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diff changeset
210 static int
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211 ARTS_OpenDevice(_THIS, const char *devname, int iscapture)
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212 {
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diff changeset
213 int rc = 0;
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diff changeset
214 int bits = 0, frag_spec = 0;
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diff changeset
215 SDL_AudioFormat test_format = 0, format = 0;
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216
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diff changeset
217 /* Initialize all variables that we clean on shutdown */
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diff changeset
218 this->hidden = (struct SDL_PrivateAudioData *)
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219 SDL_malloc((sizeof *this->hidden));
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diff changeset
220 if (this->hidden == NULL) {
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diff changeset
221 SDL_OutOfMemory();
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diff changeset
222 return 0;
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223 }
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diff changeset
224 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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225
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226 /* Try for a closest match on audio format */
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diff changeset
227 for (test_format = SDL_FirstAudioFormat(this->spec.format);
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228 !format && test_format;) {
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229 #ifdef DEBUG_AUDIO
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230 fprintf(stderr, "Trying format 0x%4.4x\n", test_format);
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231 #endif
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232 switch (test_format) {
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233 case AUDIO_U8:
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234 bits = 8;
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235 format = 1;
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236 break;
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diff changeset
237 case AUDIO_S16LSB:
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238 bits = 16;
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239 format = 1;
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diff changeset
240 break;
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diff changeset
241 default:
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diff changeset
242 format = 0;
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diff changeset
243 break;
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diff changeset
244 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
245 if (!format) {
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diff changeset
246 test_format = SDL_NextAudioFormat();
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247 }
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248 }
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diff changeset
249 if (format == 0) {
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diff changeset
250 ARTS_CloseDevice(this);
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diff changeset
251 SDL_SetError("Couldn't find any hardware audio formats");
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diff changeset
252 return 0;
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diff changeset
253 }
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diff changeset
254 this->spec.format = test_format;
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255
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diff changeset
256 if ((rc = SDL_NAME(arts_init) ()) != 0) {
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diff changeset
257 ARTS_CloseDevice(this);
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diff changeset
258 SDL_SetError("Unable to initialize ARTS: %s",
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diff changeset
259 SDL_NAME(arts_error_text) (rc));
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260 return 0;
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261 }
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262 this->hidden->stream = SDL_NAME(arts_play_stream) (this->spec.freq,
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263 bits,
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264 this->spec.channels,
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265 "SDL");
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266
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267 /* Calculate the final parameters for this audio specification */
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268 SDL_CalculateAudioSpec(&this->spec);
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269
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270 /* Determine the power of two of the fragment size */
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271 for (frag_spec = 0; (0x01 << frag_spec) < this->spec.size; ++frag_spec);
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272 if ((0x01 << frag_spec) != this->spec.size) {
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273 ARTS_CloseDevice(this);
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274 SDL_SetError("Fragment size must be a power of two");
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275 return 0;
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276 }
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277 frag_spec |= 0x00020000; /* two fragments, for low latency */
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278
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279 #ifdef ARTS_P_PACKET_SETTINGS
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280 SDL_NAME(arts_stream_set) (this->hidden->stream,
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281 ARTS_P_PACKET_SETTINGS, frag_spec);
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282 #else
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283 SDL_NAME(arts_stream_set) (this->hidden->stream, ARTS_P_PACKET_SIZE,
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284 frag_spec & 0xffff);
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285 SDL_NAME(arts_stream_set) (this->hidden->stream, ARTS_P_PACKET_COUNT,
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286 frag_spec >> 16);
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287 #endif
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288 this->spec.size = SDL_NAME(arts_stream_get) (this->hidden->stream,
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289 ARTS_P_PACKET_SIZE);
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290
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291 /* Allocate mixing buffer */
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292 this->hidden->mixlen = this->spec.size;
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293 this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen);
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294 if (this->hidden->mixbuf == NULL) {
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295 ARTS_CloseDevice(this);
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296 SDL_OutOfMemory();
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297 return 0;
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298 }
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299 SDL_memset(this->hidden->mixbuf, this->spec.silence, this->spec.size);
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300
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301 /* Get the parent process id (we're the parent of the audio thread) */
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302 this->hidden->parent = getpid();
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303
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304 /* We're ready to rock and roll. :-) */
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305 return 1;
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306 }
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307
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308
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309 static void
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310 ARTS_Deinitialize(void)
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311 {
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312 UnloadARTSLibrary();
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313 }
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314
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315
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316 static int
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317 ARTS_Init(SDL_AudioDriverImpl * impl)
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318 {
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319 if (LoadARTSLibrary() < 0) {
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320 return 0;
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321 } else {
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322 if (SDL_NAME(arts_init) () != 0) {
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323 UnloadARTSLibrary();
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324 SDL_SetError("ARTS: arts_init failed (no audio server?)");
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325 return 0;
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326 }
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327
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328 /* Play a stream so aRts doesn't crash */
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329 arts_stream_t stream;
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330 stream = SDL_NAME(arts_play_stream) (44100, 16, 2, "SDL");
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331 SDL_NAME(arts_write) (stream, "", 0);
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332 SDL_NAME(arts_close_stream) (stream);
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333 SDL_NAME(arts_free) ();
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334 }
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335
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336 /* Set the function pointers */
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337 impl->OpenDevice = ARTS_OpenDevice;
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338 impl->PlayDevice = ARTS_PlayDevice;
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339 impl->WaitDevice = ARTS_WaitDevice;
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340 impl->GetDeviceBuf = ARTS_GetDeviceBuf;
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341 impl->CloseDevice = ARTS_CloseDevice;
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342 impl->WaitDone = ARTS_WaitDone;
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343 impl->Deinitialize = ARTS_Deinitialize;
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344 impl->OnlyHasDefaultOutputDevice = 1;
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345
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346 return 1;
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347 }
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348
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349
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diff changeset
350 AudioBootStrap ARTS_bootstrap = {
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diff changeset
351 ARTS_DRIVER_NAME, "Analog RealTime Synthesizer", ARTS_Init, 0
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352 };
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353
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354 /* vi: set ts=4 sw=4 expandtab: */