Mercurial > sdl-ios-xcode
annotate src/audio/arts/SDL_artsaudio.c @ 548:6cd49f896c5a
Open ALSA devices in non-blocking mode (thanks Aleksey!)
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sun, 17 Nov 2002 20:02:26 +0000 |
| parents | 583a07ab5444 |
| children | b8d311d90021 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
| 6 modify it under the terms of the GNU Library General Public | |
| 7 License as published by the Free Software Foundation; either | |
| 8 version 2 of the License, or (at your option) any later version. | |
| 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 | |
| 13 Library General Public License for more details. | |
| 14 | |
| 15 You should have received a copy of the GNU Library General Public | |
| 16 License along with this library; if not, write to the Free | |
| 17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 18 | |
| 19 Sam Lantinga | |
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20 slouken@libsdl.org |
| 0 | 21 */ |
| 22 | |
| 23 #ifdef SAVE_RCSID | |
| 24 static char rcsid = | |
| 25 "@(#) $Id$"; | |
| 26 #endif | |
| 27 | |
| 28 /* Allow access to a raw mixing buffer */ | |
| 29 | |
| 30 #include <sys/types.h> | |
| 31 #include <stdlib.h> | |
| 32 #include <stdio.h> | |
| 33 #include <string.h> | |
| 34 #include <errno.h> | |
| 35 #include <signal.h> | |
| 36 #include <unistd.h> | |
| 37 | |
| 38 #include "SDL_audio.h" | |
| 39 #include "SDL_error.h" | |
| 40 #include "SDL_audiomem.h" | |
| 41 #include "SDL_audio_c.h" | |
| 42 #include "SDL_timer.h" | |
| 43 #include "SDL_audiodev_c.h" | |
| 44 #include "SDL_artsaudio.h" | |
| 45 | |
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46 #ifdef ARTSC_DYNAMIC |
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47 #include "SDL_name.h" |
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48 #include "SDL_loadso.h" |
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49 #else |
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50 #define SDL_NAME(X) X |
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51 #endif |
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52 |
| 0 | 53 /* The tag name used by artsc audio */ |
| 54 #define ARTSC_DRIVER_NAME "artsc" | |
| 55 | |
| 56 /* Audio driver functions */ | |
| 57 static int ARTSC_OpenAudio(_THIS, SDL_AudioSpec *spec); | |
| 58 static void ARTSC_WaitAudio(_THIS); | |
| 59 static void ARTSC_PlayAudio(_THIS); | |
| 60 static Uint8 *ARTSC_GetAudioBuf(_THIS); | |
| 61 static void ARTSC_CloseAudio(_THIS); | |
| 62 | |
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63 #ifdef ARTSC_DYNAMIC |
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64 |
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65 static const char *arts_library = ARTSC_DYNAMIC; |
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66 static void *arts_handle = NULL; |
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67 static int arts_loaded = 0; |
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68 |
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69 static int (*SDL_NAME(arts_init))(void); |
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70 static void (*SDL_NAME(arts_free))(void); |
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71 static arts_stream_t (*SDL_NAME(arts_play_stream))(int rate, int bits, int channels, const char *name); |
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72 static int (*SDL_NAME(arts_stream_set))(arts_stream_t s, arts_parameter_t param, int value); |
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73 static int (*SDL_NAME(arts_stream_get))(arts_stream_t s, arts_parameter_t param); |
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74 static int (*SDL_NAME(arts_write))(arts_stream_t s, const void *buffer, int count); |
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75 static void (*SDL_NAME(arts_close_stream))(arts_stream_t s); |
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76 |
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77 static struct { |
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78 const char *name; |
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79 void **func; |
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80 } arts_functions[] = { |
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81 { "arts_init", (void **)&SDL_NAME(arts_init) }, |
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82 { "arts_free", (void **)&SDL_NAME(arts_free) }, |
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83 { "arts_play_stream", (void **)&SDL_NAME(arts_play_stream) }, |
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84 { "arts_stream_set", (void **)&SDL_NAME(arts_stream_set) }, |
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85 { "arts_stream_get", (void **)&SDL_NAME(arts_stream_get) }, |
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86 { "arts_write", (void **)&SDL_NAME(arts_write) }, |
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87 { "arts_close_stream", (void **)&SDL_NAME(arts_close_stream) }, |
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88 }; |
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89 |
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90 static void UnloadARTSLibrary() |
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91 { |
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92 if ( arts_loaded ) { |
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93 SDL_UnloadObject(arts_handle); |
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94 arts_handle = NULL; |
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95 arts_loaded = 0; |
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96 } |
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97 } |
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98 |
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99 static int LoadARTSLibrary(void) |
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100 { |
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101 int i, retval = -1; |
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102 |
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103 arts_handle = SDL_LoadObject(arts_library); |
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104 if ( arts_handle ) { |
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105 arts_loaded = 1; |
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106 retval = 0; |
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107 for ( i=0; i<SDL_TABLESIZE(arts_functions); ++i ) { |
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108 *arts_functions[i].func = SDL_LoadFunction(arts_handle, arts_functions[i].name); |
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109 if ( ! arts_functions[i].func ) { |
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110 retval = -1; |
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111 UnloadARTSLibrary(); |
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112 break; |
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113 } |
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114 } |
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115 } |
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116 return retval; |
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117 } |
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118 |
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119 #else |
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120 |
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121 static void UnloadARTSLibrary() |
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122 { |
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123 return; |
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124 } |
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125 |
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126 static int LoadARTSLibrary(void) |
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127 { |
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128 return 0; |
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129 } |
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130 |
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131 #endif /* ARTSC_DYNAMIC */ |
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132 |
| 0 | 133 /* Audio driver bootstrap functions */ |
| 134 | |
| 135 static int Audio_Available(void) | |
| 136 { | |
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137 int available = 0; |
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138 |
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139 if ( LoadARTSLibrary() < 0 ) { |
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140 return available; |
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141 } |
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142 if ( SDL_NAME(arts_init)() == 0 ) { |
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143 available = 1; |
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144 SDL_NAME(arts_free)(); |
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145 } |
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146 UnloadARTSLibrary(); |
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147 |
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148 return available; |
| 0 | 149 } |
| 150 | |
| 151 static void Audio_DeleteDevice(SDL_AudioDevice *device) | |
| 152 { | |
| 153 free(device->hidden); | |
| 154 free(device); | |
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155 UnloadARTSLibrary(); |
| 0 | 156 } |
| 157 | |
| 158 static SDL_AudioDevice *Audio_CreateDevice(int devindex) | |
| 159 { | |
| 160 SDL_AudioDevice *this; | |
| 161 | |
| 162 /* Initialize all variables that we clean on shutdown */ | |
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163 LoadARTSLibrary(); |
| 0 | 164 this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice)); |
| 165 if ( this ) { | |
| 166 memset(this, 0, (sizeof *this)); | |
| 167 this->hidden = (struct SDL_PrivateAudioData *) | |
| 168 malloc((sizeof *this->hidden)); | |
| 169 } | |
| 170 if ( (this == NULL) || (this->hidden == NULL) ) { | |
| 171 SDL_OutOfMemory(); | |
| 172 if ( this ) { | |
| 173 free(this); | |
| 174 } | |
| 175 return(0); | |
| 176 } | |
| 177 memset(this->hidden, 0, (sizeof *this->hidden)); | |
| 178 stream = 0; | |
| 179 | |
| 180 /* Set the function pointers */ | |
| 181 this->OpenAudio = ARTSC_OpenAudio; | |
| 182 this->WaitAudio = ARTSC_WaitAudio; | |
| 183 this->PlayAudio = ARTSC_PlayAudio; | |
| 184 this->GetAudioBuf = ARTSC_GetAudioBuf; | |
| 185 this->CloseAudio = ARTSC_CloseAudio; | |
| 186 | |
| 187 this->free = Audio_DeleteDevice; | |
| 188 | |
| 189 return this; | |
| 190 } | |
| 191 | |
| 192 AudioBootStrap ARTSC_bootstrap = { | |
| 193 ARTSC_DRIVER_NAME, "Analog Realtime Synthesizer", | |
| 194 Audio_Available, Audio_CreateDevice | |
| 195 }; | |
| 196 | |
| 197 /* This function waits until it is possible to write a full sound buffer */ | |
| 198 static void ARTSC_WaitAudio(_THIS) | |
| 199 { | |
| 200 Sint32 ticks; | |
| 201 | |
| 202 /* Check to see if the thread-parent process is still alive */ | |
| 203 { static int cnt = 0; | |
| 204 /* Note that this only works with thread implementations | |
| 205 that use a different process id for each thread. | |
| 206 */ | |
| 207 if (parent && (((++cnt)%10) == 0)) { /* Check every 10 loops */ | |
| 208 if ( kill(parent, 0) < 0 ) { | |
| 209 this->enabled = 0; | |
| 210 } | |
| 211 } | |
| 212 } | |
| 213 | |
| 214 /* Use timer for general audio synchronization */ | |
| 215 ticks = ((Sint32)(next_frame - SDL_GetTicks()))-FUDGE_TICKS; | |
| 216 if ( ticks > 0 ) { | |
| 217 SDL_Delay(ticks); | |
| 218 } | |
| 219 } | |
| 220 | |
| 221 static void ARTSC_PlayAudio(_THIS) | |
| 222 { | |
| 223 int written; | |
| 224 | |
| 225 /* Write the audio data */ | |
|
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226 written = SDL_NAME(arts_write)(stream, mixbuf, mixlen); |
| 0 | 227 |
| 228 /* If timer synchronization is enabled, set the next write frame */ | |
| 229 if ( frame_ticks ) { | |
| 230 next_frame += frame_ticks; | |
| 231 } | |
| 232 | |
| 233 /* If we couldn't write, assume fatal error for now */ | |
| 234 if ( written < 0 ) { | |
| 235 this->enabled = 0; | |
| 236 } | |
| 237 #ifdef DEBUG_AUDIO | |
| 238 fprintf(stderr, "Wrote %d bytes of audio data\n", written); | |
| 239 #endif | |
| 240 } | |
| 241 | |
| 242 static Uint8 *ARTSC_GetAudioBuf(_THIS) | |
| 243 { | |
| 244 return(mixbuf); | |
| 245 } | |
| 246 | |
| 247 static void ARTSC_CloseAudio(_THIS) | |
| 248 { | |
| 249 if ( mixbuf != NULL ) { | |
| 250 SDL_FreeAudioMem(mixbuf); | |
| 251 mixbuf = NULL; | |
| 252 } | |
| 253 if ( stream ) { | |
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254 SDL_NAME(arts_close_stream)(stream); |
| 0 | 255 stream = 0; |
| 256 } | |
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257 SDL_NAME(arts_free)(); |
| 0 | 258 } |
| 259 | |
| 260 static int ARTSC_OpenAudio(_THIS, SDL_AudioSpec *spec) | |
| 261 { | |
| 262 int bits, frag_spec; | |
| 263 Uint16 test_format, format; | |
| 264 | |
| 265 /* Reset the timer synchronization flag */ | |
| 266 frame_ticks = 0.0; | |
| 267 | |
| 268 mixbuf = NULL; | |
| 269 | |
| 270 /* Try for a closest match on audio format */ | |
| 271 format = 0; | |
| 272 bits = 0; | |
| 273 for ( test_format = SDL_FirstAudioFormat(spec->format); | |
| 274 ! format && test_format; ) { | |
| 275 #ifdef DEBUG_AUDIO | |
| 276 fprintf(stderr, "Trying format 0x%4.4x\n", test_format); | |
| 277 #endif | |
| 278 switch ( test_format ) { | |
| 279 case AUDIO_U8: | |
| 280 bits = 8; | |
| 281 format = 1; | |
| 282 break; | |
| 283 case AUDIO_S16LSB: | |
| 284 bits = 16; | |
| 285 format = 1; | |
| 286 break; | |
| 287 default: | |
| 288 format = 0; | |
| 289 break; | |
| 290 } | |
| 291 if ( ! format ) { | |
| 292 test_format = SDL_NextAudioFormat(); | |
| 293 } | |
| 294 } | |
| 295 if ( format == 0 ) { | |
| 296 SDL_SetError("Couldn't find any hardware audio formats"); | |
| 297 return(-1); | |
| 298 } | |
| 299 spec->format = test_format; | |
| 300 | |
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301 if ( SDL_NAME(arts_init)() != 0 ) { |
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302 SDL_SetError("Unable to initialize ARTS"); |
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303 return(-1); |
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304 } |
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305 stream = SDL_NAME(arts_play_stream)(spec->freq, bits, spec->channels, "SDL"); |
| 0 | 306 |
| 307 /* Calculate the final parameters for this audio specification */ | |
| 308 SDL_CalculateAudioSpec(spec); | |
| 309 | |
| 310 /* Determine the power of two of the fragment size */ | |
| 311 for ( frag_spec = 0; (0x01<<frag_spec) < spec->size; ++frag_spec ); | |
| 312 if ( (0x01<<frag_spec) != spec->size ) { | |
| 313 SDL_SetError("Fragment size must be a power of two"); | |
| 314 return(-1); | |
| 315 } | |
| 316 frag_spec |= 0x00020000; /* two fragments, for low latency */ | |
| 317 | |
| 318 #ifdef ARTS_P_PACKET_SETTINGS | |
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319 SDL_NAME(arts_stream_set)(stream, ARTS_P_PACKET_SETTINGS, frag_spec); |
| 0 | 320 #else |
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321 SDL_NAME(arts_stream_set)(stream, ARTS_P_PACKET_SIZE, frag_spec&0xffff); |
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322 SDL_NAME(arts_stream_set)(stream, ARTS_P_PACKET_COUNT, frag_spec>>16); |
| 0 | 323 #endif |
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324 spec->size = SDL_NAME(arts_stream_get)(stream, ARTS_P_PACKET_SIZE); |
| 0 | 325 |
| 326 /* Allocate mixing buffer */ | |
| 327 mixlen = spec->size; | |
| 328 mixbuf = (Uint8 *)SDL_AllocAudioMem(mixlen); | |
| 329 if ( mixbuf == NULL ) { | |
| 330 return(-1); | |
| 331 } | |
| 332 memset(mixbuf, spec->silence, spec->size); | |
| 333 | |
| 334 /* Get the parent process id (we're the parent of the audio thread) */ | |
| 335 parent = getpid(); | |
| 336 | |
| 337 /* We're ready to rock and roll. :-) */ | |
| 338 return(0); | |
| 339 } |