e14743d1 |
1 | /* |
2 | SDL - Simple DirectMedia Layer |
3 | Copyright (C) 1997-2009 Sam Lantinga |
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 |
20 | slouken@libsdl.org |
21 | */ |
22 | #include "SDL_config.h" |
23 | |
24 | #include <errno.h> |
25 | #include <unistd.h> |
26 | #include <fcntl.h> |
27 | #include <signal.h> |
28 | #include <sys/types.h> |
29 | #include <sys/time.h> |
30 | #include <sched.h> |
31 | #include <sys/select.h> |
32 | #include <sys/neutrino.h> |
33 | #include <sys/asoundlib.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_nto_audio.h" |
40 | |
41 | /* The tag name used by NTO audio */ |
42 | #define DRIVER_NAME "qsa-nto" |
43 | |
44 | /* default channel communication parameters */ |
45 | #define DEFAULT_CPARAMS_RATE 22050 |
46 | #define DEFAULT_CPARAMS_VOICES 1 |
47 | /* FIXME: need to add in the near future flexible logic with frag_size and frags count */ |
48 | #define DEFAULT_CPARAMS_FRAG_SIZE 4096 |
49 | #define DEFAULT_CPARAMS_FRAGS_MIN 1 |
50 | #define DEFAULT_CPARAMS_FRAGS_MAX 1 |
51 | |
52 | /* Open the audio device for playback, and don't block if busy */ |
53 | #define OPEN_FLAGS SND_PCM_OPEN_PLAYBACK |
54 | |
55 | #define QSA_NO_WORKAROUNDS 0x00000000 |
56 | #define QSA_MMAP_WORKAROUND 0x00000001 |
57 | |
58 | struct BuggyCards |
59 | { |
60 | char* cardname; |
61 | unsigned long bugtype; |
62 | }; |
63 | |
64 | #define QSA_WA_CARDS 3 |
65 | |
66 | struct BuggyCards buggycards[QSA_WA_CARDS]= |
67 | { |
68 | {"Sound Blaster Live!", QSA_MMAP_WORKAROUND}, |
69 | {"Vortex 8820", QSA_MMAP_WORKAROUND}, |
70 | {"Vortex 8830", QSA_MMAP_WORKAROUND}, |
71 | }; |
72 | |
73 | /* Audio driver functions */ |
74 | static void NTO_ThreadInit(_THIS); |
75 | static int NTO_OpenAudio(_THIS, SDL_AudioSpec* spec); |
76 | static void NTO_WaitAudio(_THIS); |
77 | static void NTO_PlayAudio(_THIS); |
78 | static Uint8* NTO_GetAudioBuf(_THIS); |
79 | static void NTO_CloseAudio(_THIS); |
80 | |
81 | /* card names check to apply the workarounds */ |
82 | static int NTO_CheckBuggyCards(_THIS, unsigned long checkfor) |
83 | { |
84 | char scardname[33]; |
85 | int it; |
86 | |
87 | if (snd_card_get_name(cardno, scardname, 32)<0) |
88 | { |
89 | return 0; |
90 | } |
91 | |
92 | for (it=0; it<QSA_WA_CARDS; it++) |
93 | { |
94 | if (SDL_strcmp(buggycards[it].cardname, scardname)==0) |
95 | { |
96 | if (buggycards[it].bugtype==checkfor) |
97 | { |
98 | return 1; |
99 | } |
100 | } |
101 | } |
102 | |
103 | return 0; |
104 | } |
105 | |
106 | static void NTO_ThreadInit(_THIS) |
107 | { |
108 | int status; |
109 | struct sched_param param; |
110 | |
111 | /* increasing default 10 priority to 25 to avoid jerky sound */ |
112 | status=SchedGet(0, 0, ¶m); |
113 | param.sched_priority=param.sched_curpriority+15; |
114 | status=SchedSet(0, 0, SCHED_NOCHANGE, ¶m); |
115 | } |
116 | |
117 | /* PCM transfer channel parameters initialize function */ |
118 | static void NTO_InitAudioParams(snd_pcm_channel_params_t* cpars) |
119 | { |
120 | SDL_memset(cpars, 0, sizeof(snd_pcm_channel_params_t)); |
121 | |
122 | cpars->channel = SND_PCM_CHANNEL_PLAYBACK; |
123 | cpars->mode = SND_PCM_MODE_BLOCK; |
124 | cpars->start_mode = SND_PCM_START_DATA; |
125 | cpars->stop_mode = SND_PCM_STOP_STOP; |
126 | cpars->format.format = SND_PCM_SFMT_S16_LE; |
127 | cpars->format.interleave = 1; |
128 | cpars->format.rate = DEFAULT_CPARAMS_RATE; |
129 | cpars->format.voices = DEFAULT_CPARAMS_VOICES; |
130 | cpars->buf.block.frag_size = DEFAULT_CPARAMS_FRAG_SIZE; |
131 | cpars->buf.block.frags_min = DEFAULT_CPARAMS_FRAGS_MIN; |
132 | cpars->buf.block.frags_max = DEFAULT_CPARAMS_FRAGS_MAX; |
133 | } |
134 | |
135 | static int NTO_AudioAvailable(void) |
136 | { |
137 | /* See if we can open a nonblocking channel. |
138 | Return value '1' means we can. |
139 | Return value '0' means we cannot. */ |
140 | |
141 | int available; |
142 | int rval; |
143 | snd_pcm_t* handle; |
144 | |
145 | available = 0; |
146 | handle = NULL; |
147 | |
148 | rval = snd_pcm_open_preferred(&handle, NULL, NULL, OPEN_FLAGS); |
149 | |
150 | if (rval >= 0) |
151 | { |
152 | available = 1; |
153 | |
154 | if ((rval = snd_pcm_close(handle)) < 0) |
155 | { |
156 | SDL_SetError("NTO_AudioAvailable(): snd_pcm_close failed: %s\n", snd_strerror(rval)); |
157 | available = 0; |
158 | } |
159 | } |
160 | else |
161 | { |
162 | SDL_SetError("NTO_AudioAvailable(): there are no available audio devices.\n"); |
163 | } |
164 | |
165 | return (available); |
166 | } |
167 | |
168 | static void NTO_DeleteAudioDevice(SDL_AudioDevice *device) |
169 | { |
170 | if ((device)&&(device->hidden)) |
171 | { |
172 | SDL_free(device->hidden); |
173 | } |
174 | if (device) |
175 | { |
176 | SDL_free(device); |
177 | } |
178 | } |
179 | |
180 | static SDL_AudioDevice* NTO_CreateAudioDevice(int devindex) |
181 | { |
182 | SDL_AudioDevice *this; |
183 | |
184 | /* Initialize all variables that we clean on shutdown */ |
185 | this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice)); |
186 | if (this) |
187 | { |
188 | SDL_memset(this, 0, sizeof(SDL_AudioDevice)); |
189 | this->hidden = (struct SDL_PrivateAudioData *)SDL_malloc(sizeof(struct SDL_PrivateAudioData)); |
190 | } |
191 | if ((this == NULL) || (this->hidden == NULL)) |
192 | { |
193 | SDL_OutOfMemory(); |
194 | if (this) |
195 | { |
196 | SDL_free(this); |
197 | } |
198 | return (0); |
199 | } |
200 | SDL_memset(this->hidden, 0, sizeof(struct SDL_PrivateAudioData)); |
201 | audio_handle = NULL; |
202 | |
203 | /* Set the function pointers */ |
204 | this->ThreadInit = NTO_ThreadInit; |
205 | this->OpenAudio = NTO_OpenAudio; |
206 | this->WaitAudio = NTO_WaitAudio; |
207 | this->PlayAudio = NTO_PlayAudio; |
208 | this->GetAudioBuf = NTO_GetAudioBuf; |
209 | this->CloseAudio = NTO_CloseAudio; |
210 | |
211 | this->free = NTO_DeleteAudioDevice; |
212 | |
213 | return this; |
214 | } |
215 | |
216 | AudioBootStrap QNXNTOAUDIO_bootstrap = |
217 | { |
218 | DRIVER_NAME, "QNX6 QSA-NTO Audio", |
219 | NTO_AudioAvailable, |
220 | NTO_CreateAudioDevice |
221 | }; |
222 | |
223 | /* This function waits until it is possible to write a full sound buffer */ |
224 | static void NTO_WaitAudio(_THIS) |
225 | { |
226 | fd_set wfds; |
227 | int selectret; |
228 | |
229 | FD_ZERO(&wfds); |
230 | FD_SET(audio_fd, &wfds); |
231 | |
232 | do { |
233 | selectret=select(audio_fd + 1, NULL, &wfds, NULL, NULL); |
234 | switch (selectret) |
235 | { |
236 | case -1: |
237 | case 0: SDL_SetError("NTO_WaitAudio(): select() failed: %s\n", strerror(errno)); |
238 | return; |
239 | default: if (FD_ISSET(audio_fd, &wfds)) |
240 | { |
241 | return; |
242 | } |
243 | break; |
244 | } |
245 | } while(1); |
246 | } |
247 | |
248 | static void NTO_PlayAudio(_THIS) |
249 | { |
250 | int written, rval; |
251 | int towrite; |
252 | void* pcmbuffer; |
253 | |
254 | if (!this->enabled) |
255 | { |
256 | return; |
257 | } |
258 | |
259 | towrite = this->spec.size; |
260 | pcmbuffer = pcm_buf; |
261 | |
262 | /* Write the audio data, checking for EAGAIN (buffer full) and underrun */ |
263 | do { |
264 | written = snd_pcm_plugin_write(audio_handle, pcm_buf, towrite); |
265 | if (written != towrite) |
266 | { |
267 | if ((errno == EAGAIN) || (errno == EWOULDBLOCK)) |
268 | { |
269 | /* Let a little CPU time go by and try to write again */ |
270 | SDL_Delay(1); |
271 | /* if we wrote some data */ |
272 | towrite -= written; |
273 | pcmbuffer += written * this->spec.channels; |
274 | continue; |
275 | } |
276 | else |
277 | { |
278 | if ((errno == EINVAL) || (errno == EIO)) |
279 | { |
280 | SDL_memset(&cstatus, 0, sizeof(cstatus)); |
281 | cstatus.channel = SND_PCM_CHANNEL_PLAYBACK; |
282 | if ((rval = snd_pcm_plugin_status(audio_handle, &cstatus)) < 0) |
283 | { |
284 | SDL_SetError("NTO_PlayAudio(): snd_pcm_plugin_status failed: %s\n", snd_strerror(rval)); |
285 | return; |
286 | } |
287 | if ((cstatus.status == SND_PCM_STATUS_UNDERRUN) || (cstatus.status == SND_PCM_STATUS_READY)) |
288 | { |
289 | if ((rval = snd_pcm_plugin_prepare(audio_handle, SND_PCM_CHANNEL_PLAYBACK)) < 0) |
290 | { |
291 | SDL_SetError("NTO_PlayAudio(): snd_pcm_plugin_prepare failed: %s\n", snd_strerror(rval)); |
292 | return; |
293 | } |
294 | } |
295 | continue; |
296 | } |
297 | else |
298 | { |
299 | return; |
300 | } |
301 | } |
302 | } |
303 | else |
304 | { |
305 | /* we wrote all remaining data */ |
306 | towrite -= written; |
307 | pcmbuffer += written * this->spec.channels; |
308 | } |
309 | } while ((towrite > 0) && (this->enabled)); |
310 | |
311 | /* If we couldn't write, assume fatal error for now */ |
312 | if (towrite != 0) |
313 | { |
314 | this->enabled = 0; |
315 | } |
316 | |
317 | return; |
318 | } |
319 | |
320 | static Uint8* NTO_GetAudioBuf(_THIS) |
321 | { |
322 | return pcm_buf; |
323 | } |
324 | |
325 | static void NTO_CloseAudio(_THIS) |
326 | { |
327 | int rval; |
328 | |
329 | this->enabled = 0; |
330 | |
331 | if (audio_handle != NULL) |
332 | { |
333 | if ((rval = snd_pcm_plugin_flush(audio_handle, SND_PCM_CHANNEL_PLAYBACK)) < 0) |
334 | { |
335 | SDL_SetError("NTO_CloseAudio(): snd_pcm_plugin_flush failed: %s\n", snd_strerror(rval)); |
336 | return; |
337 | } |
338 | if ((rval = snd_pcm_close(audio_handle)) < 0) |
339 | { |
340 | SDL_SetError("NTO_CloseAudio(): snd_pcm_close failed: %s\n",snd_strerror(rval)); |
341 | return; |
342 | } |
343 | audio_handle = NULL; |
344 | } |
345 | } |
346 | |
347 | static int NTO_OpenAudio(_THIS, SDL_AudioSpec* spec) |
348 | { |
349 | int rval; |
350 | int format; |
351 | Uint16 test_format; |
352 | int found; |
353 | |
354 | audio_handle = NULL; |
355 | this->enabled = 0; |
356 | |
357 | if (pcm_buf != NULL) |
358 | { |
359 | SDL_FreeAudioMem(pcm_buf); |
360 | pcm_buf = NULL; |
361 | } |
362 | |
363 | /* initialize channel transfer parameters to default */ |
364 | NTO_InitAudioParams(&cparams); |
365 | |
366 | /* Open the audio device */ |
367 | rval = snd_pcm_open_preferred(&audio_handle, &cardno, &deviceno, OPEN_FLAGS); |
368 | if (rval < 0) |
369 | { |
370 | SDL_SetError("NTO_OpenAudio(): snd_pcm_open failed: %s\n", snd_strerror(rval)); |
371 | return (-1); |
372 | } |
373 | |
374 | if (!NTO_CheckBuggyCards(this, QSA_MMAP_WORKAROUND)) |
375 | { |
376 | /* enable count status parameter */ |
377 | if ((rval = snd_pcm_plugin_set_disable(audio_handle, PLUGIN_DISABLE_MMAP)) < 0) |
378 | { |
379 | SDL_SetError("snd_pcm_plugin_set_disable failed: %s\n", snd_strerror(rval)); |
380 | return (-1); |
381 | } |
382 | } |
383 | |
384 | /* Try for a closest match on audio format */ |
385 | format = 0; |
386 | /* can't use format as SND_PCM_SFMT_U8 = 0 in nto */ |
387 | found = 0; |
388 | |
389 | for (test_format=SDL_FirstAudioFormat(spec->format); !found ;) |
390 | { |
391 | /* if match found set format to equivalent ALSA format */ |
392 | switch (test_format) |
393 | { |
394 | case AUDIO_U8: |
395 | format = SND_PCM_SFMT_U8; |
396 | found = 1; |
397 | break; |
398 | case AUDIO_S8: |
399 | format = SND_PCM_SFMT_S8; |
400 | found = 1; |
401 | break; |
402 | case AUDIO_S16LSB: |
403 | format = SND_PCM_SFMT_S16_LE; |
404 | found = 1; |
405 | break; |
406 | case AUDIO_S16MSB: |
407 | format = SND_PCM_SFMT_S16_BE; |
408 | found = 1; |
409 | break; |
410 | case AUDIO_U16LSB: |
411 | format = SND_PCM_SFMT_U16_LE; |
412 | found = 1; |
413 | break; |
414 | case AUDIO_U16MSB: |
415 | format = SND_PCM_SFMT_U16_BE; |
416 | found = 1; |
417 | break; |
418 | default: |
419 | break; |
420 | } |
421 | |
422 | if (!found) |
423 | { |
424 | test_format = SDL_NextAudioFormat(); |
425 | } |
426 | } |
427 | |
428 | /* assumes test_format not 0 on success */ |
429 | if (test_format == 0) |
430 | { |
431 | SDL_SetError("NTO_OpenAudio(): Couldn't find any hardware audio formats"); |
432 | return (-1); |
433 | } |
434 | |
435 | spec->format = test_format; |
436 | |
437 | /* Set the audio format */ |
438 | cparams.format.format = format; |
439 | |
440 | /* Set mono or stereo audio (currently only two channels supported) */ |
441 | cparams.format.voices = spec->channels; |
442 | |
443 | /* Set rate */ |
444 | cparams.format.rate = spec->freq; |
445 | |
446 | /* Setup the transfer parameters according to cparams */ |
447 | rval = snd_pcm_plugin_params(audio_handle, &cparams); |
448 | if (rval < 0) |
449 | { |
450 | SDL_SetError("NTO_OpenAudio(): snd_pcm_channel_params failed: %s\n", snd_strerror(rval)); |
451 | return (-1); |
452 | } |
453 | |
454 | /* Make sure channel is setup right one last time */ |
455 | SDL_memset(&csetup, 0x00, sizeof(csetup)); |
456 | csetup.channel = SND_PCM_CHANNEL_PLAYBACK; |
457 | if (snd_pcm_plugin_setup(audio_handle, &csetup) < 0) |
458 | { |
459 | SDL_SetError("NTO_OpenAudio(): Unable to setup playback channel\n"); |
460 | return -1; |
461 | } |
462 | |
463 | |
464 | /* Calculate the final parameters for this audio specification */ |
465 | SDL_CalculateAudioSpec(spec); |
466 | |
467 | pcm_len = spec->size; |
468 | |
469 | if (pcm_len==0) |
470 | { |
471 | pcm_len = csetup.buf.block.frag_size * spec->channels * (snd_pcm_format_width(format)/8); |
472 | } |
473 | |
474 | /* Allocate memory to the audio buffer and initialize with silence (Note that |
475 | buffer size must be a multiple of fragment size, so find closest multiple) |
476 | */ |
477 | pcm_buf = (Uint8*)SDL_AllocAudioMem(pcm_len); |
478 | if (pcm_buf == NULL) |
479 | { |
480 | SDL_SetError("NTO_OpenAudio(): pcm buffer allocation failed\n"); |
481 | return (-1); |
482 | } |
483 | SDL_memset(pcm_buf, spec->silence, pcm_len); |
484 | |
485 | /* get the file descriptor */ |
486 | if ((audio_fd = snd_pcm_file_descriptor(audio_handle, SND_PCM_CHANNEL_PLAYBACK)) < 0) |
487 | { |
488 | SDL_SetError("NTO_OpenAudio(): snd_pcm_file_descriptor failed with error code: %s\n", snd_strerror(rval)); |
489 | return (-1); |
490 | } |
491 | |
492 | /* Trigger audio playback */ |
493 | rval = snd_pcm_plugin_prepare(audio_handle, SND_PCM_CHANNEL_PLAYBACK); |
494 | if (rval < 0) |
495 | { |
496 | SDL_SetError("snd_pcm_plugin_prepare failed: %s\n", snd_strerror(rval)); |
497 | return (-1); |
498 | } |
499 | |
500 | this->enabled = 1; |
501 | |
502 | /* Get the parent process id (we're the parent of the audio thread) */ |
503 | parent = getpid(); |
504 | |
505 | /* We're really ready to rock and roll. :-) */ |
506 | return (0); |
507 | } |