Mercurial > sdl-ios-xcode
annotate src/audio/arts/SDL_artsaudio.c @ 301:fb4c4c6a2773
Fixed dynamic arts support.
author | Sam Lantinga <slouken@libsdl.org> |
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date | Wed, 06 Mar 2002 19:14:17 +0000 |
parents | f6ffac90895c |
children | 583a07ab5444 |
rev | line source |
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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(); |
0 | 147 } |
148 | |
149 static void Audio_DeleteDevice(SDL_AudioDevice *device) | |
150 { | |
151 free(device->hidden); | |
152 free(device); | |
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153 UnloadARTSLibrary(); |
0 | 154 } |
155 | |
156 static SDL_AudioDevice *Audio_CreateDevice(int devindex) | |
157 { | |
158 SDL_AudioDevice *this; | |
159 | |
160 /* Initialize all variables that we clean on shutdown */ | |
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161 LoadARTSLibrary(); |
0 | 162 this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice)); |
163 if ( this ) { | |
164 memset(this, 0, (sizeof *this)); | |
165 this->hidden = (struct SDL_PrivateAudioData *) | |
166 malloc((sizeof *this->hidden)); | |
167 } | |
168 if ( (this == NULL) || (this->hidden == NULL) ) { | |
169 SDL_OutOfMemory(); | |
170 if ( this ) { | |
171 free(this); | |
172 } | |
173 return(0); | |
174 } | |
175 memset(this->hidden, 0, (sizeof *this->hidden)); | |
176 stream = 0; | |
177 | |
178 /* Set the function pointers */ | |
179 this->OpenAudio = ARTSC_OpenAudio; | |
180 this->WaitAudio = ARTSC_WaitAudio; | |
181 this->PlayAudio = ARTSC_PlayAudio; | |
182 this->GetAudioBuf = ARTSC_GetAudioBuf; | |
183 this->CloseAudio = ARTSC_CloseAudio; | |
184 | |
185 this->free = Audio_DeleteDevice; | |
186 | |
187 return this; | |
188 } | |
189 | |
190 AudioBootStrap ARTSC_bootstrap = { | |
191 ARTSC_DRIVER_NAME, "Analog Realtime Synthesizer", | |
192 Audio_Available, Audio_CreateDevice | |
193 }; | |
194 | |
195 /* This function waits until it is possible to write a full sound buffer */ | |
196 static void ARTSC_WaitAudio(_THIS) | |
197 { | |
198 Sint32 ticks; | |
199 | |
200 /* Check to see if the thread-parent process is still alive */ | |
201 { static int cnt = 0; | |
202 /* Note that this only works with thread implementations | |
203 that use a different process id for each thread. | |
204 */ | |
205 if (parent && (((++cnt)%10) == 0)) { /* Check every 10 loops */ | |
206 if ( kill(parent, 0) < 0 ) { | |
207 this->enabled = 0; | |
208 } | |
209 } | |
210 } | |
211 | |
212 /* Use timer for general audio synchronization */ | |
213 ticks = ((Sint32)(next_frame - SDL_GetTicks()))-FUDGE_TICKS; | |
214 if ( ticks > 0 ) { | |
215 SDL_Delay(ticks); | |
216 } | |
217 } | |
218 | |
219 static void ARTSC_PlayAudio(_THIS) | |
220 { | |
221 int written; | |
222 | |
223 /* Write the audio data */ | |
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224 written = SDL_NAME(arts_write)(stream, mixbuf, mixlen); |
0 | 225 |
226 /* If timer synchronization is enabled, set the next write frame */ | |
227 if ( frame_ticks ) { | |
228 next_frame += frame_ticks; | |
229 } | |
230 | |
231 /* If we couldn't write, assume fatal error for now */ | |
232 if ( written < 0 ) { | |
233 this->enabled = 0; | |
234 } | |
235 #ifdef DEBUG_AUDIO | |
236 fprintf(stderr, "Wrote %d bytes of audio data\n", written); | |
237 #endif | |
238 } | |
239 | |
240 static Uint8 *ARTSC_GetAudioBuf(_THIS) | |
241 { | |
242 return(mixbuf); | |
243 } | |
244 | |
245 static void ARTSC_CloseAudio(_THIS) | |
246 { | |
247 if ( mixbuf != NULL ) { | |
248 SDL_FreeAudioMem(mixbuf); | |
249 mixbuf = NULL; | |
250 } | |
251 if ( stream ) { | |
294
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252 SDL_NAME(arts_close_stream)(stream); |
0 | 253 stream = 0; |
254 } | |
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255 SDL_NAME(arts_free)(); |
0 | 256 } |
257 | |
258 static int ARTSC_OpenAudio(_THIS, SDL_AudioSpec *spec) | |
259 { | |
260 int bits, frag_spec; | |
261 Uint16 test_format, format; | |
262 | |
263 /* Reset the timer synchronization flag */ | |
264 frame_ticks = 0.0; | |
265 | |
266 mixbuf = NULL; | |
267 | |
268 /* Try for a closest match on audio format */ | |
269 format = 0; | |
270 bits = 0; | |
271 for ( test_format = SDL_FirstAudioFormat(spec->format); | |
272 ! format && test_format; ) { | |
273 #ifdef DEBUG_AUDIO | |
274 fprintf(stderr, "Trying format 0x%4.4x\n", test_format); | |
275 #endif | |
276 switch ( test_format ) { | |
277 case AUDIO_U8: | |
278 bits = 8; | |
279 format = 1; | |
280 break; | |
281 case AUDIO_S16LSB: | |
282 bits = 16; | |
283 format = 1; | |
284 break; | |
285 default: | |
286 format = 0; | |
287 break; | |
288 } | |
289 if ( ! format ) { | |
290 test_format = SDL_NextAudioFormat(); | |
291 } | |
292 } | |
293 if ( format == 0 ) { | |
294 SDL_SetError("Couldn't find any hardware audio formats"); | |
295 return(-1); | |
296 } | |
297 spec->format = test_format; | |
298 | |
294
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299 if ( SDL_NAME(arts_init)() != 0 ) { |
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300 SDL_SetError("Unable to initialize ARTS"); |
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301 return(-1); |
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302 } |
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303 stream = SDL_NAME(arts_play_stream)(spec->freq, bits, spec->channels, "SDL"); |
0 | 304 |
305 /* Calculate the final parameters for this audio specification */ | |
306 SDL_CalculateAudioSpec(spec); | |
307 | |
308 /* Determine the power of two of the fragment size */ | |
309 for ( frag_spec = 0; (0x01<<frag_spec) < spec->size; ++frag_spec ); | |
310 if ( (0x01<<frag_spec) != spec->size ) { | |
311 SDL_SetError("Fragment size must be a power of two"); | |
312 return(-1); | |
313 } | |
314 frag_spec |= 0x00020000; /* two fragments, for low latency */ | |
315 | |
316 #ifdef ARTS_P_PACKET_SETTINGS | |
294
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317 SDL_NAME(arts_stream_set)(stream, ARTS_P_PACKET_SETTINGS, frag_spec); |
0 | 318 #else |
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319 SDL_NAME(arts_stream_set)(stream, ARTS_P_PACKET_SIZE, frag_spec&0xffff); |
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320 SDL_NAME(arts_stream_set)(stream, ARTS_P_PACKET_COUNT, frag_spec>>16); |
0 | 321 #endif |
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322 spec->size = SDL_NAME(arts_stream_get)(stream, ARTS_P_PACKET_SIZE); |
0 | 323 |
324 /* Allocate mixing buffer */ | |
325 mixlen = spec->size; | |
326 mixbuf = (Uint8 *)SDL_AllocAudioMem(mixlen); | |
327 if ( mixbuf == NULL ) { | |
328 return(-1); | |
329 } | |
330 memset(mixbuf, spec->silence, spec->size); | |
331 | |
332 /* Get the parent process id (we're the parent of the audio thread) */ | |
333 parent = getpid(); | |
334 | |
335 /* We're ready to rock and roll. :-) */ | |
336 return(0); | |
337 } |