Mercurial > sdl-ios-xcode
annotate src/audio/arts/SDL_artsaudio.c @ 1338:604d73db6802
Removed uses of stdlib.h and string.h
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Tue, 07 Feb 2006 09:29:18 +0000 |
| parents | 3692456e7b0f |
| children | c71e05b4dc2e |
| rev | line source |
|---|---|
| 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 */ |
| 22 | |
| 23 /* Allow access to a raw mixing buffer */ | |
| 24 | |
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25 #include "SDL_stdlib.h" |
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26 #include "SDL_string.h" |
| 0 | 27 #include "SDL_audio.h" |
| 28 #include "SDL_error.h" | |
| 29 #include "SDL_audiomem.h" | |
| 30 #include "SDL_audio_c.h" | |
| 31 #include "SDL_timer.h" | |
| 32 #include "SDL_audiodev_c.h" | |
| 33 #include "SDL_artsaudio.h" | |
| 34 | |
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35 #ifdef ARTSC_DYNAMIC |
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36 #include "SDL_name.h" |
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37 #include "SDL_loadso.h" |
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38 #else |
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39 #define SDL_NAME(X) X |
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40 #endif |
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41 |
| 0 | 42 /* The tag name used by artsc audio */ |
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43 #define ARTSC_DRIVER_NAME "arts" |
| 0 | 44 |
| 45 /* Audio driver functions */ | |
| 46 static int ARTSC_OpenAudio(_THIS, SDL_AudioSpec *spec); | |
| 47 static void ARTSC_WaitAudio(_THIS); | |
| 48 static void ARTSC_PlayAudio(_THIS); | |
| 49 static Uint8 *ARTSC_GetAudioBuf(_THIS); | |
| 50 static void ARTSC_CloseAudio(_THIS); | |
| 51 | |
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52 #ifdef ARTSC_DYNAMIC |
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53 |
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54 static const char *arts_library = ARTSC_DYNAMIC; |
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55 static void *arts_handle = NULL; |
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56 static int arts_loaded = 0; |
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57 |
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58 static int (*SDL_NAME(arts_init))(void); |
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59 static void (*SDL_NAME(arts_free))(void); |
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60 static arts_stream_t (*SDL_NAME(arts_play_stream))(int rate, int bits, int channels, const char *name); |
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61 static int (*SDL_NAME(arts_stream_set))(arts_stream_t s, arts_parameter_t param, int value); |
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62 static int (*SDL_NAME(arts_stream_get))(arts_stream_t s, arts_parameter_t param); |
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63 static int (*SDL_NAME(arts_write))(arts_stream_t s, const void *buffer, int count); |
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64 static void (*SDL_NAME(arts_close_stream))(arts_stream_t s); |
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65 |
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66 static struct { |
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67 const char *name; |
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68 void **func; |
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69 } arts_functions[] = { |
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70 { "arts_init", (void **)&SDL_NAME(arts_init) }, |
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71 { "arts_free", (void **)&SDL_NAME(arts_free) }, |
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72 { "arts_play_stream", (void **)&SDL_NAME(arts_play_stream) }, |
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73 { "arts_stream_set", (void **)&SDL_NAME(arts_stream_set) }, |
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74 { "arts_stream_get", (void **)&SDL_NAME(arts_stream_get) }, |
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75 { "arts_write", (void **)&SDL_NAME(arts_write) }, |
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76 { "arts_close_stream", (void **)&SDL_NAME(arts_close_stream) }, |
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77 }; |
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78 |
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79 static void UnloadARTSLibrary() |
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80 { |
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81 if ( arts_loaded ) { |
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82 SDL_UnloadObject(arts_handle); |
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83 arts_handle = NULL; |
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84 arts_loaded = 0; |
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85 } |
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86 } |
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87 |
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88 static int 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 arts_handle = SDL_LoadObject(arts_library); |
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93 if ( arts_handle ) { |
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94 arts_loaded = 1; |
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95 retval = 0; |
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96 for ( i=0; i<SDL_TABLESIZE(arts_functions); ++i ) { |
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97 *arts_functions[i].func = SDL_LoadFunction(arts_handle, arts_functions[i].name); |
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98 if ( !*arts_functions[i].func ) { |
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99 retval = -1; |
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100 UnloadARTSLibrary(); |
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101 break; |
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102 } |
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103 } |
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104 } |
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105 return retval; |
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106 } |
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107 |
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108 #else |
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109 |
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110 static void UnloadARTSLibrary() |
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111 { |
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112 return; |
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113 } |
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114 |
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115 static int LoadARTSLibrary(void) |
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116 { |
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117 return 0; |
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118 } |
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119 |
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120 #endif /* ARTSC_DYNAMIC */ |
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121 |
| 0 | 122 /* Audio driver bootstrap functions */ |
| 123 | |
| 124 static int Audio_Available(void) | |
| 125 { | |
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126 int available = 0; |
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127 |
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128 if ( LoadARTSLibrary() < 0 ) { |
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129 return available; |
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130 } |
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131 if ( SDL_NAME(arts_init)() == 0 ) { |
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132 #define ARTS_CRASH_HACK /* Play a stream so aRts doesn't crash */ |
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133 #ifdef ARTS_CRASH_HACK |
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134 arts_stream_t stream2; |
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135 stream2=SDL_NAME(arts_play_stream)(44100, 16, 2, "SDL"); |
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136 SDL_NAME(arts_write)(stream2, "", 0); |
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137 SDL_NAME(arts_close_stream)(stream2); |
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138 #endif |
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139 available = 1; |
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140 SDL_NAME(arts_free)(); |
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141 } |
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142 UnloadARTSLibrary(); |
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143 |
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144 return available; |
| 0 | 145 } |
| 146 | |
| 147 static void Audio_DeleteDevice(SDL_AudioDevice *device) | |
| 148 { | |
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149 SDL_free(device->hidden); |
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150 SDL_free(device); |
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151 UnloadARTSLibrary(); |
| 0 | 152 } |
| 153 | |
| 154 static SDL_AudioDevice *Audio_CreateDevice(int devindex) | |
| 155 { | |
| 156 SDL_AudioDevice *this; | |
| 157 | |
| 158 /* Initialize all variables that we clean on shutdown */ | |
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159 LoadARTSLibrary(); |
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160 this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice)); |
| 0 | 161 if ( this ) { |
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162 SDL_memset(this, 0, (sizeof *this)); |
| 0 | 163 this->hidden = (struct SDL_PrivateAudioData *) |
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164 SDL_malloc((sizeof *this->hidden)); |
| 0 | 165 } |
| 166 if ( (this == NULL) || (this->hidden == NULL) ) { | |
| 167 SDL_OutOfMemory(); | |
| 168 if ( this ) { | |
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169 SDL_free(this); |
| 0 | 170 } |
| 171 return(0); | |
| 172 } | |
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173 SDL_memset(this->hidden, 0, (sizeof *this->hidden)); |
| 0 | 174 stream = 0; |
| 175 | |
| 176 /* Set the function pointers */ | |
| 177 this->OpenAudio = ARTSC_OpenAudio; | |
| 178 this->WaitAudio = ARTSC_WaitAudio; | |
| 179 this->PlayAudio = ARTSC_PlayAudio; | |
| 180 this->GetAudioBuf = ARTSC_GetAudioBuf; | |
| 181 this->CloseAudio = ARTSC_CloseAudio; | |
| 182 | |
| 183 this->free = Audio_DeleteDevice; | |
| 184 | |
| 185 return this; | |
| 186 } | |
| 187 | |
| 188 AudioBootStrap ARTSC_bootstrap = { | |
| 189 ARTSC_DRIVER_NAME, "Analog Realtime Synthesizer", | |
| 190 Audio_Available, Audio_CreateDevice | |
| 191 }; | |
| 192 | |
| 193 /* This function waits until it is possible to write a full sound buffer */ | |
| 194 static void ARTSC_WaitAudio(_THIS) | |
| 195 { | |
| 196 Sint32 ticks; | |
| 197 | |
| 198 /* Check to see if the thread-parent process is still alive */ | |
| 199 { static int cnt = 0; | |
| 200 /* Note that this only works with thread implementations | |
| 201 that use a different process id for each thread. | |
| 202 */ | |
| 203 if (parent && (((++cnt)%10) == 0)) { /* Check every 10 loops */ | |
| 204 if ( kill(parent, 0) < 0 ) { | |
| 205 this->enabled = 0; | |
| 206 } | |
| 207 } | |
| 208 } | |
| 209 | |
| 210 /* Use timer for general audio synchronization */ | |
| 211 ticks = ((Sint32)(next_frame - SDL_GetTicks()))-FUDGE_TICKS; | |
| 212 if ( ticks > 0 ) { | |
| 213 SDL_Delay(ticks); | |
| 214 } | |
| 215 } | |
| 216 | |
| 217 static void ARTSC_PlayAudio(_THIS) | |
| 218 { | |
| 219 int written; | |
| 220 | |
| 221 /* Write the audio data */ | |
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222 written = SDL_NAME(arts_write)(stream, mixbuf, mixlen); |
| 0 | 223 |
| 224 /* If timer synchronization is enabled, set the next write frame */ | |
| 225 if ( frame_ticks ) { | |
| 226 next_frame += frame_ticks; | |
| 227 } | |
| 228 | |
| 229 /* If we couldn't write, assume fatal error for now */ | |
| 230 if ( written < 0 ) { | |
| 231 this->enabled = 0; | |
| 232 } | |
| 233 #ifdef DEBUG_AUDIO | |
| 234 fprintf(stderr, "Wrote %d bytes of audio data\n", written); | |
| 235 #endif | |
| 236 } | |
| 237 | |
| 238 static Uint8 *ARTSC_GetAudioBuf(_THIS) | |
| 239 { | |
| 240 return(mixbuf); | |
| 241 } | |
| 242 | |
| 243 static void ARTSC_CloseAudio(_THIS) | |
| 244 { | |
| 245 if ( mixbuf != NULL ) { | |
| 246 SDL_FreeAudioMem(mixbuf); | |
| 247 mixbuf = NULL; | |
| 248 } | |
| 249 if ( stream ) { | |
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250 SDL_NAME(arts_close_stream)(stream); |
| 0 | 251 stream = 0; |
| 252 } | |
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253 SDL_NAME(arts_free)(); |
| 0 | 254 } |
| 255 | |
| 256 static int ARTSC_OpenAudio(_THIS, SDL_AudioSpec *spec) | |
| 257 { | |
| 258 int bits, frag_spec; | |
| 259 Uint16 test_format, format; | |
| 260 | |
| 261 /* Reset the timer synchronization flag */ | |
| 262 frame_ticks = 0.0; | |
| 263 | |
| 264 mixbuf = NULL; | |
| 265 | |
| 266 /* Try for a closest match on audio format */ | |
| 267 format = 0; | |
| 268 bits = 0; | |
| 269 for ( test_format = SDL_FirstAudioFormat(spec->format); | |
| 270 ! format && test_format; ) { | |
| 271 #ifdef DEBUG_AUDIO | |
| 272 fprintf(stderr, "Trying format 0x%4.4x\n", test_format); | |
| 273 #endif | |
| 274 switch ( test_format ) { | |
| 275 case AUDIO_U8: | |
| 276 bits = 8; | |
| 277 format = 1; | |
| 278 break; | |
| 279 case AUDIO_S16LSB: | |
| 280 bits = 16; | |
| 281 format = 1; | |
| 282 break; | |
| 283 default: | |
| 284 format = 0; | |
| 285 break; | |
| 286 } | |
| 287 if ( ! format ) { | |
| 288 test_format = SDL_NextAudioFormat(); | |
| 289 } | |
| 290 } | |
| 291 if ( format == 0 ) { | |
| 292 SDL_SetError("Couldn't find any hardware audio formats"); | |
| 293 return(-1); | |
| 294 } | |
| 295 spec->format = test_format; | |
| 296 | |
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297 if ( SDL_NAME(arts_init)() != 0 ) { |
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298 SDL_SetError("Unable to initialize ARTS"); |
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299 return(-1); |
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300 } |
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301 stream = SDL_NAME(arts_play_stream)(spec->freq, bits, spec->channels, "SDL"); |
| 0 | 302 |
| 303 /* Calculate the final parameters for this audio specification */ | |
| 304 SDL_CalculateAudioSpec(spec); | |
| 305 | |
| 306 /* Determine the power of two of the fragment size */ | |
| 307 for ( frag_spec = 0; (0x01<<frag_spec) < spec->size; ++frag_spec ); | |
| 308 if ( (0x01<<frag_spec) != spec->size ) { | |
| 309 SDL_SetError("Fragment size must be a power of two"); | |
| 310 return(-1); | |
| 311 } | |
| 312 frag_spec |= 0x00020000; /* two fragments, for low latency */ | |
| 313 | |
| 314 #ifdef ARTS_P_PACKET_SETTINGS | |
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315 SDL_NAME(arts_stream_set)(stream, ARTS_P_PACKET_SETTINGS, frag_spec); |
| 0 | 316 #else |
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317 SDL_NAME(arts_stream_set)(stream, ARTS_P_PACKET_SIZE, frag_spec&0xffff); |
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318 SDL_NAME(arts_stream_set)(stream, ARTS_P_PACKET_COUNT, frag_spec>>16); |
| 0 | 319 #endif |
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320 spec->size = SDL_NAME(arts_stream_get)(stream, ARTS_P_PACKET_SIZE); |
| 0 | 321 |
| 322 /* Allocate mixing buffer */ | |
| 323 mixlen = spec->size; | |
| 324 mixbuf = (Uint8 *)SDL_AllocAudioMem(mixlen); | |
| 325 if ( mixbuf == NULL ) { | |
| 326 return(-1); | |
| 327 } | |
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328 SDL_memset(mixbuf, spec->silence, spec->size); |
| 0 | 329 |
| 330 /* Get the parent process id (we're the parent of the audio thread) */ | |
| 331 parent = getpid(); | |
| 332 | |
| 333 /* We're ready to rock and roll. :-) */ | |
| 334 return(0); | |
| 335 } |