Mercurial > sdl-ios-xcode
annotate src/audio/arts/SDL_artsaudio.c @ 2121:85ed90a755fa
Reworked r3067:3068 from branches/SDL-1.2: arts unavailable hardware bug fix.
author | Ryan C. Gordon <icculus@icculus.org> |
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date | Thu, 14 Jun 2007 14:22:54 +0000 |
parents | 866052b01ee5 |
children | e1a70460c354 |
rev | line source |
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0 | 1 /* |
2 SDL - Simple DirectMedia Layer | |
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3 Copyright (C) 1997-2006 Sam Lantinga |
0 | 4 |
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 |
0 | 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. |
0 | 9 |
10 This library is distributed in the hope that it will be useful, | |
11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
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13 Lesser General Public License for more details. |
0 | 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 |
0 | 18 |
19 Sam Lantinga | |
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20 slouken@libsdl.org |
0 | 21 */ |
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22 #include "SDL_config.h" |
0 | 23 |
24 /* Allow access to a raw mixing buffer */ | |
25 | |
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26 #include "SDL_timer.h" |
0 | 27 #include "SDL_audio.h" |
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28 #include "../SDL_audiomem.h" |
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29 #include "../SDL_audio_c.h" |
0 | 30 #include "SDL_artsaudio.h" |
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 |
0 | 39 /* The tag name used by artsc audio */ |
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40 #define ARTS_DRIVER_NAME "arts" |
0 | 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 int (*SDL_NAME(arts_suspended))(void); |
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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[] = { |
2060 | 69 SDL_ARTS_SYM(arts_init), |
70 SDL_ARTS_SYM(arts_free), | |
71 SDL_ARTS_SYM(arts_play_stream), | |
72 SDL_ARTS_SYM(arts_stream_set), | |
73 SDL_ARTS_SYM(arts_stream_get), | |
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_suspended), |
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77 SDL_ARTS_SYM(arts_error_text), |
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78 }; |
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79 #undef SDL_ARTS_SYM |
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80 |
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81 static void |
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82 UnloadARTSLibrary() |
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83 { |
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84 if (arts_handle != NULL) { |
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85 SDL_UnloadObject(arts_handle); |
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86 arts_handle = NULL; |
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87 } |
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88 } |
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89 |
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90 static int |
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91 LoadARTSLibrary(void) |
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92 { |
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93 int i, retval = -1; |
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94 |
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95 if (arts_handle == NULL) { |
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96 arts_handle = SDL_LoadObject(arts_library); |
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97 if (arts_handle != NULL) { |
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98 retval = 0; |
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99 for (i = 0; i < SDL_arraysize(arts_functions); ++i) { |
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100 *arts_functions[i].func = |
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101 SDL_LoadFunction(arts_handle, arts_functions[i].name); |
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102 if (!*arts_functions[i].func) { |
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103 retval = -1; |
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104 UnloadARTSLibrary(); |
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105 break; |
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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 |
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111 return retval; |
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112 } |
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113 |
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114 #else |
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115 |
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116 static void |
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117 UnloadARTSLibrary() |
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118 { |
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119 return; |
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120 } |
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121 |
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122 static int |
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123 LoadARTSLibrary(void) |
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124 { |
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125 return 0; |
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126 } |
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127 |
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128 #endif /* SDL_AUDIO_DRIVER_ARTS_DYNAMIC */ |
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129 |
0 | 130 /* This function waits until it is possible to write a full sound buffer */ |
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131 static void |
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132 ARTS_WaitDevice(_THIS) |
0 | 133 { |
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134 Sint32 ticks; |
0 | 135 |
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136 /* Check to see if the thread-parent process is still alive */ |
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137 { |
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138 static int cnt = 0; |
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139 /* Note that this only works with thread implementations |
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140 that use a different process id for each thread. |
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141 */ |
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142 /* Check every 10 loops */ |
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143 if (this->hidden->parent && (((++cnt) % 10) == 0)) { |
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144 if (kill(this->hidden->parent, 0) < 0) { |
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145 this->enabled = 0; |
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146 } |
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147 } |
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148 } |
0 | 149 |
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150 /* Use timer for general audio synchronization */ |
2060 | 151 ticks = |
152 ((Sint32) (this->hidden->next_frame - SDL_GetTicks())) - FUDGE_TICKS; | |
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153 if (ticks > 0) { |
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154 SDL_Delay(ticks); |
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155 } |
0 | 156 } |
157 | |
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158 static void |
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159 ARTS_PlayDevice(_THIS) |
0 | 160 { |
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161 /* Write the audio data */ |
2060 | 162 int written = SDL_NAME(arts_write) (this->hidden->stream, |
163 this->hidden->mixbuf, | |
164 this->hidden->mixlen); | |
0 | 165 |
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166 /* If timer synchronization is enabled, set the next write frame */ |
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167 if (this->hidden->frame_ticks) { |
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168 this->hidden->next_frame += this->hidden->frame_ticks; |
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169 } |
0 | 170 |
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171 /* If we couldn't write, assume fatal error for now */ |
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172 if (written < 0) { |
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173 this->enabled = 0; |
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174 } |
0 | 175 #ifdef DEBUG_AUDIO |
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176 fprintf(stderr, "Wrote %d bytes of audio data\n", written); |
0 | 177 #endif |
178 } | |
179 | |
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180 static void |
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181 ARTS_WaitDone(_THIS) |
0 | 182 { |
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183 /* !!! FIXME: camp here until buffer drains... SDL_Delay(???); */ |
0 | 184 } |
185 | |
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186 |
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187 static Uint8 * |
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188 ARTS_GetDeviceBuf(_THIS) |
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189 { |
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190 return (this->hidden->mixbuf); |
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191 } |
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192 |
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193 |
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194 static void |
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195 ARTS_CloseDevice(_THIS) |
0 | 196 { |
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197 if (this->hidden != NULL) { |
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198 if (this->hidden->mixbuf != NULL) { |
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199 SDL_FreeAudioMem(this->hidden->mixbuf); |
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200 this->hidden->mixbuf = NULL; |
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201 } |
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202 if (this->hidden->stream) { |
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203 SDL_NAME(arts_close_stream) (this->hidden->stream); |
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204 this->hidden->stream = 0; |
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205 } |
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206 SDL_NAME(arts_free) (); |
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207 SDL_free(this->hidden); |
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208 this->hidden = NULL; |
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209 } |
0 | 210 } |
211 | |
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212 |
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213 static int |
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214 ARTS_OpenDevice(_THIS, const char *devname, int iscapture) |
0 | 215 { |
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216 int rc = 0; |
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217 int bits = 0, frag_spec = 0; |
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218 SDL_AudioFormat test_format = 0, format = 0; |
0 | 219 |
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220 /* Initialize all variables that we clean on shutdown */ |
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221 this->hidden = (struct SDL_PrivateAudioData *) |
2060 | 222 SDL_malloc((sizeof *this->hidden)); |
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223 if (this->hidden == NULL) { |
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224 SDL_OutOfMemory(); |
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225 return 0; |
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226 } |
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227 SDL_memset(this->hidden, 0, (sizeof *this->hidden)); |
0 | 228 |
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229 /* Try for a closest match on audio format */ |
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230 for (test_format = SDL_FirstAudioFormat(this->spec.format); |
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231 !format && test_format;) { |
0 | 232 #ifdef DEBUG_AUDIO |
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233 fprintf(stderr, "Trying format 0x%4.4x\n", test_format); |
0 | 234 #endif |
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235 switch (test_format) { |
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236 case AUDIO_U8: |
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237 bits = 8; |
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238 format = 1; |
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239 break; |
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240 case AUDIO_S16LSB: |
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241 bits = 16; |
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242 format = 1; |
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243 break; |
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244 default: |
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245 format = 0; |
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246 break; |
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247 } |
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248 if (!format) { |
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249 test_format = SDL_NextAudioFormat(); |
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250 } |
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251 } |
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252 if (format == 0) { |
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253 ARTS_CloseDevice(this); |
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254 SDL_SetError("Couldn't find any hardware audio formats"); |
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255 return 0; |
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256 } |
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257 this->spec.format = test_format; |
0 | 258 |
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259 if ((rc = SDL_NAME(arts_init) ()) != 0) { |
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260 ARTS_CloseDevice(this); |
2060 | 261 SDL_SetError("Unable to initialize ARTS: %s", |
262 SDL_NAME(arts_error_text) (rc)); | |
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263 return 0; |
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264 } |
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265 |
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266 if ( ! SDL_NAME(arts_suspended)() ) { |
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267 ARTS_CloseDevice(this); |
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268 SDL_SetError("ARTS can not open audio device"); |
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269 return 0; |
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270 } |
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271 |
2060 | 272 this->hidden->stream = SDL_NAME(arts_play_stream) (this->spec.freq, |
273 bits, | |
274 this->spec.channels, | |
275 "SDL"); | |
0 | 276 |
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277 /* Play nothing so we have at least one write (server bug workaround). */ |
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278 SDL_NAME(arts_write) (this->hidden->stream, "", 0); |
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279 |
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280 /* Calculate the final parameters for this audio specification */ |
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281 SDL_CalculateAudioSpec(&this->spec); |
0 | 282 |
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283 /* Determine the power of two of the fragment size */ |
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284 for (frag_spec = 0; (0x01 << frag_spec) < this->spec.size; ++frag_spec); |
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285 if ((0x01 << frag_spec) != this->spec.size) { |
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286 ARTS_CloseDevice(this); |
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287 SDL_SetError("Fragment size must be a power of two"); |
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288 return 0; |
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289 } |
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290 frag_spec |= 0x00020000; /* two fragments, for low latency */ |
0 | 291 |
292 #ifdef ARTS_P_PACKET_SETTINGS | |
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293 SDL_NAME(arts_stream_set) (this->hidden->stream, |
2060 | 294 ARTS_P_PACKET_SETTINGS, frag_spec); |
0 | 295 #else |
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296 SDL_NAME(arts_stream_set) (this->hidden->stream, ARTS_P_PACKET_SIZE, |
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297 frag_spec & 0xffff); |
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298 SDL_NAME(arts_stream_set) (this->hidden->stream, ARTS_P_PACKET_COUNT, |
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299 frag_spec >> 16); |
0 | 300 #endif |
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301 this->spec.size = SDL_NAME(arts_stream_get) (this->hidden->stream, |
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302 ARTS_P_PACKET_SIZE); |
0 | 303 |
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304 /* Allocate mixing buffer */ |
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305 this->hidden->mixlen = this->spec.size; |
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306 this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen); |
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307 if (this->hidden->mixbuf == NULL) { |
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308 ARTS_CloseDevice(this); |
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309 SDL_OutOfMemory(); |
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310 return 0; |
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311 } |
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312 SDL_memset(this->hidden->mixbuf, this->spec.silence, this->spec.size); |
0 | 313 |
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314 /* Get the parent process id (we're the parent of the audio thread) */ |
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315 this->hidden->parent = getpid(); |
0 | 316 |
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317 /* We're ready to rock and roll. :-) */ |
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318 return 1; |
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319 } |
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320 |
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321 |
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322 static void |
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323 ARTS_Deinitialize(void) |
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324 { |
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325 UnloadARTSLibrary(); |
0 | 326 } |
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327 |
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328 |
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329 static int |
2060 | 330 ARTS_Init(SDL_AudioDriverImpl * impl) |
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331 { |
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332 if (LoadARTSLibrary() < 0) { |
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333 return 0; |
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334 } else { |
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335 if (SDL_NAME(arts_init) () != 0) { |
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336 UnloadARTSLibrary(); |
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337 SDL_SetError("ARTS: arts_init failed (no audio server?)"); |
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338 return 0; |
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339 } |
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340 |
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341 /* Play a stream so aRts doesn't crash */ |
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342 if ( SDL_NAME(arts_suspended)() ) { |
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343 arts_stream_t stream; |
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344 stream = SDL_NAME(arts_play_stream) (44100, 16, 2, "SDL"); |
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345 SDL_NAME(arts_write) (stream, "", 0); |
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346 SDL_NAME(arts_close_stream) (stream); |
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347 } |
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348 |
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349 SDL_NAME(arts_free) (); |
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350 } |
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351 |
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352 /* Set the function pointers */ |
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353 impl->OpenDevice = ARTS_OpenDevice; |
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354 impl->PlayDevice = ARTS_PlayDevice; |
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355 impl->WaitDevice = ARTS_WaitDevice; |
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356 impl->GetDeviceBuf = ARTS_GetDeviceBuf; |
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357 impl->CloseDevice = ARTS_CloseDevice; |
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358 impl->WaitDone = ARTS_WaitDone; |
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359 impl->Deinitialize = ARTS_Deinitialize; |
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360 impl->OnlyHasDefaultOutputDevice = 1; |
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361 |
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362 return 1; |
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363 } |
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364 |
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365 |
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366 AudioBootStrap ARTS_bootstrap = { |
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367 ARTS_DRIVER_NAME, "Analog RealTime Synthesizer", ARTS_Init, 0 |
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368 }; |
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369 |
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370 /* vi: set ts=4 sw=4 expandtab: */ |