|
1 /* |
|
2 SDL - Simple DirectMedia Layer |
|
3 Copyright (C) 1997-2006 Sam Lantinga |
|
4 |
|
5 This library is free software; you can redistribute it and/or |
|
6 modify it under the terms of the GNU Lesser General Public |
|
7 License as published by the Free Software Foundation; either |
|
8 version 2.1 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 Lesser General Public License for more details. |
|
14 |
|
15 You should have received a copy of the GNU Lesser General Public |
|
16 License along with this library; if not, write to the Free Software |
|
17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
|
18 |
|
19 Carsten Griwodz |
|
20 griff@kom.tu-darmstadt.de |
|
21 |
|
22 based on linux/SDL_dspaudio.c by Sam Lantinga |
|
23 */ |
|
24 #include "SDL_config.h" |
|
25 |
|
26 /* Allow access to a raw mixing buffer */ |
|
27 |
|
28 #include <errno.h> |
|
29 #include <unistd.h> |
|
30 #include <fcntl.h> |
|
31 #include <sys/time.h> |
|
32 #include <sys/ioctl.h> |
|
33 #include <sys/stat.h> |
|
34 |
|
35 #include "SDL_timer.h" |
|
36 #include "SDL_audio.h" |
|
37 #include "../SDL_audiomem.h" |
|
38 #include "../SDL_audio_c.h" |
|
39 #include "../SDL_audiodev_c.h" |
|
40 #include "SDL_paudio.h" |
|
41 |
|
42 #define DEBUG_AUDIO 1 |
|
43 |
|
44 /* A conflict within AIX 4.3.3 <sys/> headers and probably others as well. |
|
45 * I guess nobody ever uses audio... Shame over AIX header files. */ |
|
46 #include <sys/machine.h> |
|
47 #undef BIG_ENDIAN |
|
48 #include <sys/audio.h> |
|
49 |
|
50 /* The tag name used by paud audio */ |
|
51 #define Paud_DRIVER_NAME "paud" |
|
52 |
|
53 /* Open the audio device for playback, and don't block if busy */ |
|
54 /* #define OPEN_FLAGS (O_WRONLY|O_NONBLOCK) */ |
|
55 #define OPEN_FLAGS O_WRONLY |
|
56 |
|
57 /* Audio driver functions */ |
|
58 static int Paud_OpenAudio(_THIS, SDL_AudioSpec *spec); |
|
59 static void Paud_WaitAudio(_THIS); |
|
60 static void Paud_PlayAudio(_THIS); |
|
61 static Uint8 *Paud_GetAudioBuf(_THIS); |
|
62 static void Paud_CloseAudio(_THIS); |
|
63 |
|
64 /* Audio driver bootstrap functions */ |
|
65 |
|
66 static int Audio_Available(void) |
|
67 { |
|
68 int fd; |
|
69 int available; |
|
70 |
|
71 available = 0; |
|
72 fd = SDL_OpenAudioPath(NULL, 0, OPEN_FLAGS, 0); |
|
73 if ( fd >= 0 ) { |
|
74 available = 1; |
|
75 close(fd); |
|
76 } |
|
77 return(available); |
|
78 } |
|
79 |
|
80 static void Audio_DeleteDevice(SDL_AudioDevice *device) |
|
81 { |
|
82 SDL_free(device->hidden); |
|
83 SDL_free(device); |
|
84 } |
|
85 |
|
86 static SDL_AudioDevice *Audio_CreateDevice(int devindex) |
|
87 { |
|
88 SDL_AudioDevice *this; |
|
89 |
|
90 /* Initialize all variables that we clean on shutdown */ |
|
91 this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice)); |
|
92 if ( this ) { |
|
93 SDL_memset(this, 0, (sizeof *this)); |
|
94 this->hidden = (struct SDL_PrivateAudioData *) |
|
95 SDL_malloc((sizeof *this->hidden)); |
|
96 } |
|
97 if ( (this == NULL) || (this->hidden == NULL) ) { |
|
98 SDL_OutOfMemory(); |
|
99 if ( this ) { |
|
100 SDL_free(this); |
|
101 } |
|
102 return(0); |
|
103 } |
|
104 SDL_memset(this->hidden, 0, (sizeof *this->hidden)); |
|
105 audio_fd = -1; |
|
106 |
|
107 /* Set the function pointers */ |
|
108 this->OpenAudio = Paud_OpenAudio; |
|
109 this->WaitAudio = Paud_WaitAudio; |
|
110 this->PlayAudio = Paud_PlayAudio; |
|
111 this->GetAudioBuf = Paud_GetAudioBuf; |
|
112 this->CloseAudio = Paud_CloseAudio; |
|
113 |
|
114 this->free = Audio_DeleteDevice; |
|
115 |
|
116 return this; |
|
117 } |
|
118 |
|
119 AudioBootStrap Paud_bootstrap = { |
|
120 Paud_DRIVER_NAME, "AIX Paudio", |
|
121 Audio_Available, Audio_CreateDevice |
|
122 }; |
|
123 |
|
124 /* This function waits until it is possible to write a full sound buffer */ |
|
125 static void Paud_WaitAudio(_THIS) |
|
126 { |
|
127 fd_set fdset; |
|
128 |
|
129 /* See if we need to use timed audio synchronization */ |
|
130 if ( frame_ticks ) { |
|
131 /* Use timer for general audio synchronization */ |
|
132 Sint32 ticks; |
|
133 |
|
134 ticks = ((Sint32)(next_frame - SDL_GetTicks()))-FUDGE_TICKS; |
|
135 if ( ticks > 0 ) { |
|
136 SDL_Delay(ticks); |
|
137 } |
|
138 } else { |
|
139 audio_buffer paud_bufinfo; |
|
140 |
|
141 /* Use select() for audio synchronization */ |
|
142 struct timeval timeout; |
|
143 FD_ZERO(&fdset); |
|
144 FD_SET(audio_fd, &fdset); |
|
145 |
|
146 if ( ioctl(audio_fd, AUDIO_BUFFER, &paud_bufinfo) < 0 ) { |
|
147 #ifdef DEBUG_AUDIO |
|
148 fprintf(stderr, "Couldn't get audio buffer information\n"); |
|
149 #endif |
|
150 timeout.tv_sec = 10; |
|
151 timeout.tv_usec = 0; |
|
152 } else { |
|
153 long ms_in_buf = paud_bufinfo.write_buf_time; |
|
154 timeout.tv_sec = ms_in_buf/1000; |
|
155 ms_in_buf = ms_in_buf - timeout.tv_sec*1000; |
|
156 timeout.tv_usec = ms_in_buf*1000; |
|
157 #ifdef DEBUG_AUDIO |
|
158 fprintf( stderr, |
|
159 "Waiting for write_buf_time=%ld,%ld\n", |
|
160 timeout.tv_sec, |
|
161 timeout.tv_usec ); |
|
162 #endif |
|
163 } |
|
164 |
|
165 #ifdef DEBUG_AUDIO |
|
166 fprintf(stderr, "Waiting for audio to get ready\n"); |
|
167 #endif |
|
168 if ( select(audio_fd+1, NULL, &fdset, NULL, &timeout) <= 0 ) { |
|
169 const char *message = "Audio timeout - buggy audio driver? (disabled)"; |
|
170 /* |
|
171 * In general we should never print to the screen, |
|
172 * but in this case we have no other way of letting |
|
173 * the user know what happened. |
|
174 */ |
|
175 fprintf(stderr, "SDL: %s - %s\n", strerror(errno), message); |
|
176 this->enabled = 0; |
|
177 /* Don't try to close - may hang */ |
|
178 audio_fd = -1; |
|
179 #ifdef DEBUG_AUDIO |
|
180 fprintf(stderr, "Done disabling audio\n"); |
|
181 #endif |
|
182 } |
|
183 #ifdef DEBUG_AUDIO |
|
184 fprintf(stderr, "Ready!\n"); |
|
185 #endif |
|
186 } |
|
187 } |
|
188 |
|
189 static void Paud_PlayAudio(_THIS) |
|
190 { |
|
191 int written; |
|
192 |
|
193 /* Write the audio data, checking for EAGAIN on broken audio drivers */ |
|
194 do { |
|
195 written = write(audio_fd, mixbuf, mixlen); |
|
196 if ( (written < 0) && ((errno == 0) || (errno == EAGAIN)) ) { |
|
197 SDL_Delay(1); /* Let a little CPU time go by */ |
|
198 } |
|
199 } while ( (written < 0) && |
|
200 ((errno == 0) || (errno == EAGAIN) || (errno == EINTR)) ); |
|
201 |
|
202 /* If timer synchronization is enabled, set the next write frame */ |
|
203 if ( frame_ticks ) { |
|
204 next_frame += frame_ticks; |
|
205 } |
|
206 |
|
207 /* If we couldn't write, assume fatal error for now */ |
|
208 if ( written < 0 ) { |
|
209 this->enabled = 0; |
|
210 } |
|
211 #ifdef DEBUG_AUDIO |
|
212 fprintf(stderr, "Wrote %d bytes of audio data\n", written); |
|
213 #endif |
|
214 } |
|
215 |
|
216 static Uint8 *Paud_GetAudioBuf(_THIS) |
|
217 { |
|
218 return mixbuf; |
|
219 } |
|
220 |
|
221 static void Paud_CloseAudio(_THIS) |
|
222 { |
|
223 if ( mixbuf != NULL ) { |
|
224 SDL_FreeAudioMem(mixbuf); |
|
225 mixbuf = NULL; |
|
226 } |
|
227 if ( audio_fd >= 0 ) { |
|
228 close(audio_fd); |
|
229 audio_fd = -1; |
|
230 } |
|
231 } |
|
232 |
|
233 static int Paud_OpenAudio(_THIS, SDL_AudioSpec *spec) |
|
234 { |
|
235 char audiodev[1024]; |
|
236 int format; |
|
237 int bytes_per_sample; |
|
238 Uint16 test_format; |
|
239 audio_init paud_init; |
|
240 audio_buffer paud_bufinfo; |
|
241 audio_status paud_status; |
|
242 audio_control paud_control; |
|
243 audio_change paud_change; |
|
244 |
|
245 /* Reset the timer synchronization flag */ |
|
246 frame_ticks = 0.0; |
|
247 |
|
248 /* Open the audio device */ |
|
249 audio_fd = SDL_OpenAudioPath(audiodev, sizeof(audiodev), OPEN_FLAGS, 0); |
|
250 if ( audio_fd < 0 ) { |
|
251 SDL_SetError("Couldn't open %s: %s", audiodev, strerror(errno)); |
|
252 return -1; |
|
253 } |
|
254 |
|
255 /* |
|
256 * We can't set the buffer size - just ask the device for the maximum |
|
257 * that we can have. |
|
258 */ |
|
259 if ( ioctl(audio_fd, AUDIO_BUFFER, &paud_bufinfo) < 0 ) { |
|
260 SDL_SetError("Couldn't get audio buffer information"); |
|
261 return -1; |
|
262 } |
|
263 |
|
264 mixbuf = NULL; |
|
265 |
|
266 if ( spec->channels > 1 ) |
|
267 spec->channels = 2; |
|
268 else |
|
269 spec->channels = 1; |
|
270 |
|
271 /* |
|
272 * Fields in the audio_init structure: |
|
273 * |
|
274 * Ignored by us: |
|
275 * |
|
276 * paud.loadpath[LOAD_PATH]; * DSP code to load, MWave chip only? |
|
277 * paud.slot_number; * slot number of the adapter |
|
278 * paud.device_id; * adapter identification number |
|
279 * |
|
280 * Input: |
|
281 * |
|
282 * paud.srate; * the sampling rate in Hz |
|
283 * paud.bits_per_sample; * 8, 16, 32, ... |
|
284 * paud.bsize; * block size for this rate |
|
285 * paud.mode; * ADPCM, PCM, MU_LAW, A_LAW, SOURCE_MIX |
|
286 * paud.channels; * 1=mono, 2=stereo |
|
287 * paud.flags; * FIXED - fixed length data |
|
288 * * LEFT_ALIGNED, RIGHT_ALIGNED (var len only) |
|
289 * * TWOS_COMPLEMENT - 2's complement data |
|
290 * * SIGNED - signed? comment seems wrong in sys/audio.h |
|
291 * * BIG_ENDIAN |
|
292 * paud.operation; * PLAY, RECORD |
|
293 * |
|
294 * Output: |
|
295 * |
|
296 * paud.flags; * PITCH - pitch is supported |
|
297 * * INPUT - input is supported |
|
298 * * OUTPUT - output is supported |
|
299 * * MONITOR - monitor is supported |
|
300 * * VOLUME - volume is supported |
|
301 * * VOLUME_DELAY - volume delay is supported |
|
302 * * BALANCE - balance is supported |
|
303 * * BALANCE_DELAY - balance delay is supported |
|
304 * * TREBLE - treble control is supported |
|
305 * * BASS - bass control is supported |
|
306 * * BESTFIT_PROVIDED - best fit returned |
|
307 * * LOAD_CODE - DSP load needed |
|
308 * paud.rc; * NO_PLAY - DSP code can't do play requests |
|
309 * * NO_RECORD - DSP code can't do record requests |
|
310 * * INVALID_REQUEST - request was invalid |
|
311 * * CONFLICT - conflict with open's flags |
|
312 * * OVERLOADED - out of DSP MIPS or memory |
|
313 * paud.position_resolution; * smallest increment for position |
|
314 */ |
|
315 |
|
316 paud_init.srate = spec->freq; |
|
317 paud_init.mode = PCM; |
|
318 paud_init.operation = PLAY; |
|
319 paud_init.channels = spec->channels; |
|
320 |
|
321 /* Try for a closest match on audio format */ |
|
322 format = 0; |
|
323 for ( test_format = SDL_FirstAudioFormat(spec->format); |
|
324 ! format && test_format; ) { |
|
325 #ifdef DEBUG_AUDIO |
|
326 fprintf(stderr, "Trying format 0x%4.4x\n", test_format); |
|
327 #endif |
|
328 switch ( test_format ) { |
|
329 case AUDIO_U8: |
|
330 bytes_per_sample = 1; |
|
331 paud_init.bits_per_sample = 8; |
|
332 paud_init.flags = TWOS_COMPLEMENT | FIXED; |
|
333 format = 1; |
|
334 break; |
|
335 case AUDIO_S8: |
|
336 bytes_per_sample = 1; |
|
337 paud_init.bits_per_sample = 8; |
|
338 paud_init.flags = SIGNED | |
|
339 TWOS_COMPLEMENT | FIXED; |
|
340 format = 1; |
|
341 break; |
|
342 case AUDIO_S16LSB: |
|
343 bytes_per_sample = 2; |
|
344 paud_init.bits_per_sample = 16; |
|
345 paud_init.flags = SIGNED | |
|
346 TWOS_COMPLEMENT | FIXED; |
|
347 format = 1; |
|
348 break; |
|
349 case AUDIO_S16MSB: |
|
350 bytes_per_sample = 2; |
|
351 paud_init.bits_per_sample = 16; |
|
352 paud_init.flags = BIG_ENDIAN | |
|
353 SIGNED | |
|
354 TWOS_COMPLEMENT | FIXED; |
|
355 format = 1; |
|
356 break; |
|
357 case AUDIO_U16LSB: |
|
358 bytes_per_sample = 2; |
|
359 paud_init.bits_per_sample = 16; |
|
360 paud_init.flags = TWOS_COMPLEMENT | FIXED; |
|
361 format = 1; |
|
362 break; |
|
363 case AUDIO_U16MSB: |
|
364 bytes_per_sample = 2; |
|
365 paud_init.bits_per_sample = 16; |
|
366 paud_init.flags = BIG_ENDIAN | |
|
367 TWOS_COMPLEMENT | FIXED; |
|
368 format = 1; |
|
369 break; |
|
370 default: |
|
371 break; |
|
372 } |
|
373 if ( ! format ) { |
|
374 test_format = SDL_NextAudioFormat(); |
|
375 } |
|
376 } |
|
377 if ( format == 0 ) { |
|
378 #ifdef DEBUG_AUDIO |
|
379 fprintf(stderr, "Couldn't find any hardware audio formats\n"); |
|
380 #endif |
|
381 SDL_SetError("Couldn't find any hardware audio formats"); |
|
382 return -1; |
|
383 } |
|
384 spec->format = test_format; |
|
385 |
|
386 /* |
|
387 * We know the buffer size and the max number of subsequent writes |
|
388 * that can be pending. If more than one can pend, allow the application |
|
389 * to do something like double buffering between our write buffer and |
|
390 * the device's own buffer that we are filling with write() anyway. |
|
391 * |
|
392 * We calculate spec->samples like this because SDL_CalculateAudioSpec() |
|
393 * will give put paud_bufinfo.write_buf_cap (or paud_bufinfo.write_buf_cap/2) |
|
394 * into spec->size in return. |
|
395 */ |
|
396 if ( paud_bufinfo.request_buf_cap == 1 ) |
|
397 { |
|
398 spec->samples = paud_bufinfo.write_buf_cap |
|
399 / bytes_per_sample |
|
400 / spec->channels; |
|
401 } |
|
402 else |
|
403 { |
|
404 spec->samples = paud_bufinfo.write_buf_cap |
|
405 / bytes_per_sample |
|
406 / spec->channels |
|
407 / 2; |
|
408 } |
|
409 paud_init.bsize = bytes_per_sample * spec->channels; |
|
410 |
|
411 SDL_CalculateAudioSpec(spec); |
|
412 |
|
413 /* |
|
414 * The AIX paud device init can't modify the values of the audio_init |
|
415 * structure that we pass to it. So we don't need any recalculation |
|
416 * of this stuff and no reinit call as in linux dsp and dma code. |
|
417 * |
|
418 * /dev/paud supports all of the encoding formats, so we don't need |
|
419 * to do anything like reopening the device, either. |
|
420 */ |
|
421 if ( ioctl(audio_fd, AUDIO_INIT, &paud_init) < 0 ) { |
|
422 switch ( paud_init.rc ) |
|
423 { |
|
424 case 1 : |
|
425 SDL_SetError("Couldn't set audio format: DSP can't do play requests"); |
|
426 return -1; |
|
427 break; |
|
428 case 2 : |
|
429 SDL_SetError("Couldn't set audio format: DSP can't do record requests"); |
|
430 return -1; |
|
431 break; |
|
432 case 4 : |
|
433 SDL_SetError("Couldn't set audio format: request was invalid"); |
|
434 return -1; |
|
435 break; |
|
436 case 5 : |
|
437 SDL_SetError("Couldn't set audio format: conflict with open's flags"); |
|
438 return -1; |
|
439 break; |
|
440 case 6 : |
|
441 SDL_SetError("Couldn't set audio format: out of DSP MIPS or memory"); |
|
442 return -1; |
|
443 break; |
|
444 default : |
|
445 SDL_SetError("Couldn't set audio format: not documented in sys/audio.h"); |
|
446 return -1; |
|
447 break; |
|
448 } |
|
449 } |
|
450 |
|
451 /* Allocate mixing buffer */ |
|
452 mixlen = spec->size; |
|
453 mixbuf = (Uint8 *)SDL_AllocAudioMem(mixlen); |
|
454 if ( mixbuf == NULL ) { |
|
455 return -1; |
|
456 } |
|
457 SDL_memset(mixbuf, spec->silence, spec->size); |
|
458 |
|
459 /* |
|
460 * Set some paramters: full volume, first speaker that we can find. |
|
461 * Ignore the other settings for now. |
|
462 */ |
|
463 paud_change.input = AUDIO_IGNORE; /* the new input source */ |
|
464 paud_change.output = OUTPUT_1; /* EXTERNAL_SPEAKER,INTERNAL_SPEAKER,OUTPUT_1 */ |
|
465 paud_change.monitor = AUDIO_IGNORE; /* the new monitor state */ |
|
466 paud_change.volume = 0x7fffffff; /* volume level [0-0x7fffffff] */ |
|
467 paud_change.volume_delay = AUDIO_IGNORE; /* the new volume delay */ |
|
468 paud_change.balance = 0x3fffffff; /* the new balance */ |
|
469 paud_change.balance_delay = AUDIO_IGNORE; /* the new balance delay */ |
|
470 paud_change.treble = AUDIO_IGNORE; /* the new treble state */ |
|
471 paud_change.bass = AUDIO_IGNORE; /* the new bass state */ |
|
472 paud_change.pitch = AUDIO_IGNORE; /* the new pitch state */ |
|
473 |
|
474 paud_control.ioctl_request = AUDIO_CHANGE; |
|
475 paud_control.request_info = (char*)&paud_change; |
|
476 if ( ioctl(audio_fd, AUDIO_CONTROL, &paud_control) < 0 ) { |
|
477 #ifdef DEBUG_AUDIO |
|
478 fprintf(stderr, "Can't change audio display settings\n" ); |
|
479 #endif |
|
480 } |
|
481 |
|
482 /* |
|
483 * Tell the device to expect data. Actual start will wait for |
|
484 * the first write() call. |
|
485 */ |
|
486 paud_control.ioctl_request = AUDIO_START; |
|
487 paud_control.position = 0; |
|
488 if ( ioctl(audio_fd, AUDIO_CONTROL, &paud_control) < 0 ) { |
|
489 #ifdef DEBUG_AUDIO |
|
490 fprintf(stderr, "Can't start audio play\n" ); |
|
491 #endif |
|
492 SDL_SetError("Can't start audio play"); |
|
493 return -1; |
|
494 } |
|
495 |
|
496 /* Check to see if we need to use select() workaround */ |
|
497 { char *workaround; |
|
498 workaround = SDL_getenv("SDL_DSP_NOSELECT"); |
|
499 if ( workaround ) { |
|
500 frame_ticks = (float)(spec->samples*1000)/spec->freq; |
|
501 next_frame = SDL_GetTicks()+frame_ticks; |
|
502 } |
|
503 } |
|
504 |
|
505 /* Get the parent process id (we're the parent of the audio thread) */ |
|
506 parent = getpid(); |
|
507 |
|
508 /* We're ready to rock and roll. :-) */ |
|
509 return 0; |
|
510 } |
|
511 |