1 /*
2 SDL - Simple DirectMedia Layer
3 Copyright (C) 1997-2012 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
Audio_Available(void)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
Audio_DeleteDevice(SDL_AudioDevice * device)80 static void Audio_DeleteDevice(SDL_AudioDevice *device)
81 {
82 SDL_free(device->hidden);
83 SDL_free(device);
84 }
85
Audio_CreateDevice(int devindex)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 */
Paud_WaitAudio(_THIS)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
Paud_PlayAudio(_THIS)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
Paud_GetAudioBuf(_THIS)216 static Uint8 *Paud_GetAudioBuf(_THIS)
217 {
218 return mixbuf;
219 }
220
Paud_CloseAudio(_THIS)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
Paud_OpenAudio(_THIS,SDL_AudioSpec * spec)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
512