Mercurial > sdl-ios-xcode
annotate src/audio/dma/SDL_dmaaudio.c @ 4322:a8e5b518e194 SDL-1.2
Forcibly disabled MMX mixers.
Hopefully fixes Bugzilla #649.
author | Ryan C. Gordon <icculus@icculus.org> |
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date | Mon, 12 Oct 2009 08:58:12 +0000 |
parents | a1b03ba2fcd0 |
children |
rev | line source |
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0 | 1 /* |
2 SDL - Simple DirectMedia Layer | |
4159 | 3 Copyright (C) 1997-2009 Sam Lantinga |
0 | 4 |
5 This library is free software; you can redistribute it and/or | |
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6 modify it under the terms of the GNU Lesser General Public |
0 | 7 License as published by the Free Software Foundation; either |
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8 version 2.1 of the License, or (at your option) any later version. |
0 | 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 | |
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13 Lesser General Public License for more details. |
0 | 14 |
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15 You should have received a copy of the GNU Lesser General Public |
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16 License along with this library; if not, write to the Free Software |
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
0 | 18 |
19 Sam Lantinga | |
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20 slouken@libsdl.org |
0 | 21 */ |
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22 #include "SDL_config.h" |
0 | 23 |
24 /* Allow access to a raw mixing buffer */ | |
25 | |
26 #include <stdio.h> | |
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27 #include <string.h> /* For strerror() */ |
0 | 28 #include <errno.h> |
29 #include <unistd.h> | |
30 #include <fcntl.h> | |
31 #include <signal.h> | |
32 #include <sys/types.h> | |
33 #include <sys/time.h> | |
34 #include <sys/ioctl.h> | |
35 #include <sys/stat.h> | |
36 #include <sys/mman.h> | |
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37 |
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38 #if SDL_AUDIO_DRIVER_OSS_SOUNDCARD_H |
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39 /* This is installed on some systems */ |
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40 #include <soundcard.h> |
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41 #else |
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42 /* This is recommended by OSS */ |
0 | 43 #include <sys/soundcard.h> |
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44 #endif |
0 | 45 |
46 #ifndef MAP_FAILED | |
47 #define MAP_FAILED ((Uint8 *)-1) | |
48 #endif | |
49 | |
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50 #include "SDL_timer.h" |
0 | 51 #include "SDL_audio.h" |
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52 #include "../SDL_audio_c.h" |
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53 #include "../SDL_audiodev_c.h" |
0 | 54 #include "SDL_dmaaudio.h" |
55 | |
56 /* The tag name used by DMA audio */ | |
57 #define DMA_DRIVER_NAME "dma" | |
58 | |
59 /* Open the audio device for playback, and don't block if busy */ | |
60 #define OPEN_FLAGS (O_RDWR|O_NONBLOCK) | |
61 | |
62 /* Audio driver functions */ | |
63 static int DMA_OpenAudio(_THIS, SDL_AudioSpec *spec); | |
64 static void DMA_WaitAudio(_THIS); | |
65 static void DMA_PlayAudio(_THIS); | |
66 static Uint8 *DMA_GetAudioBuf(_THIS); | |
67 static void DMA_CloseAudio(_THIS); | |
68 | |
69 /* Audio driver bootstrap functions */ | |
70 | |
71 static int Audio_Available(void) | |
72 { | |
73 int available; | |
74 int fd; | |
75 | |
76 available = 0; | |
77 | |
78 fd = SDL_OpenAudioPath(NULL, 0, OPEN_FLAGS, 0); | |
79 if ( fd >= 0 ) { | |
80 int caps; | |
81 struct audio_buf_info info; | |
82 | |
83 if ( (ioctl(fd, SNDCTL_DSP_GETCAPS, &caps) == 0) && | |
84 (caps & DSP_CAP_TRIGGER) && (caps & DSP_CAP_MMAP) && | |
85 (ioctl(fd, SNDCTL_DSP_GETOSPACE, &info) == 0) ) { | |
86 available = 1; | |
87 } | |
88 close(fd); | |
89 } | |
90 return(available); | |
91 } | |
92 | |
93 static void Audio_DeleteDevice(SDL_AudioDevice *device) | |
94 { | |
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95 SDL_free(device->hidden); |
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96 SDL_free(device); |
0 | 97 } |
98 | |
99 static SDL_AudioDevice *Audio_CreateDevice(int devindex) | |
100 { | |
101 SDL_AudioDevice *this; | |
102 | |
103 /* Initialize all variables that we clean on shutdown */ | |
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104 this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice)); |
0 | 105 if ( this ) { |
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106 SDL_memset(this, 0, (sizeof *this)); |
0 | 107 this->hidden = (struct SDL_PrivateAudioData *) |
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108 SDL_malloc((sizeof *this->hidden)); |
0 | 109 } |
110 if ( (this == NULL) || (this->hidden == NULL) ) { | |
111 SDL_OutOfMemory(); | |
112 if ( this ) { | |
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113 SDL_free(this); |
0 | 114 } |
115 return(0); | |
116 } | |
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117 SDL_memset(this->hidden, 0, (sizeof *this->hidden)); |
0 | 118 audio_fd = -1; |
119 | |
120 /* Set the function pointers */ | |
121 this->OpenAudio = DMA_OpenAudio; | |
122 this->WaitAudio = DMA_WaitAudio; | |
123 this->PlayAudio = DMA_PlayAudio; | |
124 this->GetAudioBuf = DMA_GetAudioBuf; | |
125 this->CloseAudio = DMA_CloseAudio; | |
126 | |
127 this->free = Audio_DeleteDevice; | |
128 | |
129 return this; | |
130 } | |
131 | |
132 AudioBootStrap DMA_bootstrap = { | |
133 DMA_DRIVER_NAME, "OSS /dev/dsp DMA audio", | |
134 Audio_Available, Audio_CreateDevice | |
135 }; | |
136 | |
137 /* This function waits until it is possible to write a full sound buffer */ | |
138 static void DMA_WaitAudio(_THIS) | |
139 { | |
140 fd_set fdset; | |
141 | |
142 /* Check to see if the thread-parent process is still alive */ | |
143 { static int cnt = 0; | |
144 /* Note that this only works with thread implementations | |
145 that use a different process id for each thread. | |
146 */ | |
147 if (parent && (((++cnt)%10) == 0)) { /* Check every 10 loops */ | |
148 if ( kill(parent, 0) < 0 ) { | |
149 this->enabled = 0; | |
150 } | |
151 } | |
152 } | |
153 | |
154 /* See if we need to use timed audio synchronization */ | |
155 if ( frame_ticks ) { | |
156 /* Use timer for general audio synchronization */ | |
157 Sint32 ticks; | |
158 | |
159 ticks = ((Sint32)(next_frame - SDL_GetTicks()))-FUDGE_TICKS; | |
160 if ( ticks > 0 ) { | |
161 SDL_Delay(ticks); | |
162 } | |
163 } else { | |
164 /* Use select() for audio synchronization */ | |
165 struct timeval timeout; | |
166 FD_ZERO(&fdset); | |
167 FD_SET(audio_fd, &fdset); | |
168 timeout.tv_sec = 10; | |
169 timeout.tv_usec = 0; | |
170 #ifdef DEBUG_AUDIO | |
171 fprintf(stderr, "Waiting for audio to get ready\n"); | |
172 #endif | |
173 if ( select(audio_fd+1, NULL, &fdset, NULL, &timeout) <= 0 ) { | |
174 const char *message = | |
175 #ifdef AUDIO_OSPACE_HACK | |
176 "Audio timeout - buggy audio driver? (trying ospace)"; | |
177 #else | |
178 "Audio timeout - buggy audio driver? (disabled)"; | |
179 #endif | |
180 /* In general we should never print to the screen, | |
181 but in this case we have no other way of letting | |
182 the user know what happened. | |
183 */ | |
184 fprintf(stderr, "SDL: %s\n", message); | |
185 #ifdef AUDIO_OSPACE_HACK | |
186 /* We may be able to use GET_OSPACE trick */ | |
187 frame_ticks = (float)(this->spec->samples*1000) / | |
188 this->spec->freq; | |
189 next_frame = SDL_GetTicks()+frame_ticks; | |
190 #else | |
191 this->enabled = 0; | |
192 /* Don't try to close - may hang */ | |
193 audio_fd = -1; | |
194 #ifdef DEBUG_AUDIO | |
195 fprintf(stderr, "Done disabling audio\n"); | |
196 #endif | |
197 #endif /* AUDIO_OSPACE_HACK */ | |
198 } | |
199 #ifdef DEBUG_AUDIO | |
200 fprintf(stderr, "Ready!\n"); | |
201 #endif | |
202 } | |
203 } | |
204 | |
205 static void DMA_PlayAudio(_THIS) | |
206 { | |
207 /* If timer synchronization is enabled, set the next write frame */ | |
208 if ( frame_ticks ) { | |
209 next_frame += frame_ticks; | |
210 } | |
211 return; | |
212 } | |
213 | |
214 static Uint8 *DMA_GetAudioBuf(_THIS) | |
215 { | |
216 count_info info; | |
217 int playing; | |
218 int filling; | |
219 | |
220 /* Get number of blocks, looping if we're not using select() */ | |
221 do { | |
222 if ( ioctl(audio_fd, SNDCTL_DSP_GETOPTR, &info) < 0 ) { | |
223 /* Uh oh... */ | |
224 this->enabled = 0; | |
225 return(NULL); | |
226 } | |
227 } while ( frame_ticks && (info.blocks < 1) ); | |
228 #ifdef DEBUG_AUDIO | |
229 if ( info.blocks > 1 ) { | |
230 printf("Warning: audio underflow (%d frags)\n", info.blocks-1); | |
231 } | |
232 #endif | |
233 playing = info.ptr / this->spec.size; | |
234 filling = (playing + 1)%num_buffers; | |
235 return (dma_buf + (filling * this->spec.size)); | |
236 } | |
237 | |
238 static void DMA_CloseAudio(_THIS) | |
239 { | |
240 if ( dma_buf != NULL ) { | |
241 munmap(dma_buf, dma_len); | |
242 dma_buf = NULL; | |
243 } | |
244 if ( audio_fd >= 0 ) { | |
245 close(audio_fd); | |
246 audio_fd = -1; | |
247 } | |
248 } | |
249 | |
250 static int DMA_ReopenAudio(_THIS, const char *audiodev, int format, int stereo, | |
251 SDL_AudioSpec *spec) | |
252 { | |
253 int frag_spec; | |
254 int value; | |
255 | |
256 /* Close and then reopen the audio device */ | |
257 close(audio_fd); | |
258 audio_fd = open(audiodev, O_RDWR, 0); | |
259 if ( audio_fd < 0 ) { | |
260 SDL_SetError("Couldn't open %s: %s", audiodev, strerror(errno)); | |
261 return(-1); | |
262 } | |
263 | |
264 /* Calculate the final parameters for this audio specification */ | |
265 SDL_CalculateAudioSpec(spec); | |
266 | |
267 /* Determine the power of two of the fragment size */ | |
268 for ( frag_spec = 0; (0x01<<frag_spec) < spec->size; ++frag_spec ); | |
269 if ( (0x01<<frag_spec) != spec->size ) { | |
270 SDL_SetError("Fragment size must be a power of two"); | |
271 return(-1); | |
272 } | |
273 | |
274 /* Set the audio buffering parameters */ | |
275 if ( ioctl(audio_fd, SNDCTL_DSP_SETFRAGMENT, &frag_spec) < 0 ) { | |
276 SDL_SetError("Couldn't set audio fragment spec"); | |
277 return(-1); | |
278 } | |
279 | |
280 /* Set the audio format */ | |
281 value = format; | |
282 if ( (ioctl(audio_fd, SNDCTL_DSP_SETFMT, &value) < 0) || | |
283 (value != format) ) { | |
284 SDL_SetError("Couldn't set audio format"); | |
285 return(-1); | |
286 } | |
287 | |
288 /* Set mono or stereo audio */ | |
289 value = (spec->channels > 1); | |
290 if ( (ioctl(audio_fd, SNDCTL_DSP_STEREO, &stereo) < 0) || | |
291 (value != stereo) ) { | |
292 SDL_SetError("Couldn't set audio channels"); | |
293 return(-1); | |
294 } | |
295 | |
296 /* Set the DSP frequency */ | |
297 value = spec->freq; | |
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298 if ( ioctl(audio_fd, SNDCTL_DSP_SPEED, &value) < 0 ) { |
0 | 299 SDL_SetError("Couldn't set audio frequency"); |
300 return(-1); | |
301 } | |
302 spec->freq = value; | |
303 | |
304 /* We successfully re-opened the audio */ | |
305 return(0); | |
306 } | |
307 | |
308 static int DMA_OpenAudio(_THIS, SDL_AudioSpec *spec) | |
309 { | |
310 char audiodev[1024]; | |
311 int format; | |
312 int stereo; | |
313 int value; | |
314 Uint16 test_format; | |
315 struct audio_buf_info info; | |
316 | |
317 /* Reset the timer synchronization flag */ | |
318 frame_ticks = 0.0; | |
319 | |
320 /* Open the audio device */ | |
321 audio_fd = SDL_OpenAudioPath(audiodev, sizeof(audiodev), OPEN_FLAGS, 0); | |
322 if ( audio_fd < 0 ) { | |
323 SDL_SetError("Couldn't open %s: %s", audiodev, strerror(errno)); | |
324 return(-1); | |
325 } | |
326 dma_buf = NULL; | |
327 ioctl(audio_fd, SNDCTL_DSP_RESET, 0); | |
328 | |
329 /* Get a list of supported hardware formats */ | |
330 if ( ioctl(audio_fd, SNDCTL_DSP_GETFMTS, &value) < 0 ) { | |
331 SDL_SetError("Couldn't get audio format list"); | |
332 return(-1); | |
333 } | |
334 | |
335 /* Try for a closest match on audio format */ | |
336 format = 0; | |
337 for ( test_format = SDL_FirstAudioFormat(spec->format); | |
338 ! format && test_format; ) { | |
339 #ifdef DEBUG_AUDIO | |
340 fprintf(stderr, "Trying format 0x%4.4x\n", test_format); | |
341 #endif | |
342 switch ( test_format ) { | |
343 case AUDIO_U8: | |
344 if ( value & AFMT_U8 ) { | |
345 format = AFMT_U8; | |
346 } | |
347 break; | |
348 case AUDIO_S8: | |
349 if ( value & AFMT_S8 ) { | |
350 format = AFMT_S8; | |
351 } | |
352 break; | |
353 case AUDIO_S16LSB: | |
354 if ( value & AFMT_S16_LE ) { | |
355 format = AFMT_S16_LE; | |
356 } | |
357 break; | |
358 case AUDIO_S16MSB: | |
359 if ( value & AFMT_S16_BE ) { | |
360 format = AFMT_S16_BE; | |
361 } | |
362 break; | |
363 case AUDIO_U16LSB: | |
364 if ( value & AFMT_U16_LE ) { | |
365 format = AFMT_U16_LE; | |
366 } | |
367 break; | |
368 case AUDIO_U16MSB: | |
369 if ( value & AFMT_U16_BE ) { | |
370 format = AFMT_U16_BE; | |
371 } | |
372 break; | |
373 default: | |
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374 format = 0; |
0 | 375 break; |
376 } | |
377 if ( ! format ) { | |
378 test_format = SDL_NextAudioFormat(); | |
379 } | |
380 } | |
381 if ( format == 0 ) { | |
382 SDL_SetError("Couldn't find any hardware audio formats"); | |
383 return(-1); | |
384 } | |
385 spec->format = test_format; | |
386 | |
387 /* Set the audio format */ | |
388 value = format; | |
389 if ( (ioctl(audio_fd, SNDCTL_DSP_SETFMT, &value) < 0) || | |
390 (value != format) ) { | |
391 SDL_SetError("Couldn't set audio format"); | |
392 return(-1); | |
393 } | |
394 | |
395 /* Set mono or stereo audio (currently only two channels supported) */ | |
396 stereo = (spec->channels > 1); | |
397 ioctl(audio_fd, SNDCTL_DSP_STEREO, &stereo); | |
398 if ( stereo ) { | |
399 spec->channels = 2; | |
400 } else { | |
401 spec->channels = 1; | |
402 } | |
403 | |
404 /* Because some drivers don't allow setting the buffer size | |
405 after setting the format, we must re-open the audio device | |
406 once we know what format and channels are supported | |
407 */ | |
408 if ( DMA_ReopenAudio(this, audiodev, format, stereo, spec) < 0 ) { | |
409 /* Error is set by DMA_ReopenAudio() */ | |
410 return(-1); | |
411 } | |
412 | |
413 /* Memory map the audio buffer */ | |
414 if ( ioctl(audio_fd, SNDCTL_DSP_GETOSPACE, &info) < 0 ) { | |
415 SDL_SetError("Couldn't get OSPACE parameters"); | |
416 return(-1); | |
417 } | |
418 spec->size = info.fragsize; | |
419 spec->samples = spec->size / ((spec->format & 0xFF) / 8); | |
420 spec->samples /= spec->channels; | |
421 num_buffers = info.fragstotal; | |
422 dma_len = num_buffers*spec->size; | |
423 dma_buf = (Uint8 *)mmap(NULL, dma_len, PROT_WRITE, MAP_SHARED, | |
424 audio_fd, 0); | |
425 if ( dma_buf == MAP_FAILED ) { | |
426 SDL_SetError("DMA memory map failed"); | |
427 dma_buf = NULL; | |
428 return(-1); | |
429 } | |
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430 SDL_memset(dma_buf, spec->silence, dma_len); |
0 | 431 |
432 /* Check to see if we need to use select() workaround */ | |
433 { char *workaround; | |
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434 workaround = SDL_getenv("SDL_DSP_NOSELECT"); |
0 | 435 if ( workaround ) { |
436 frame_ticks = (float)(spec->samples*1000)/spec->freq; | |
437 next_frame = SDL_GetTicks()+frame_ticks; | |
438 } | |
439 } | |
440 | |
441 /* Trigger audio playback */ | |
442 value = 0; | |
443 ioctl(audio_fd, SNDCTL_DSP_SETTRIGGER, &value); | |
444 value = PCM_ENABLE_OUTPUT; | |
445 if ( ioctl(audio_fd, SNDCTL_DSP_SETTRIGGER, &value) < 0 ) { | |
446 SDL_SetError("Couldn't trigger audio output"); | |
447 return(-1); | |
448 } | |
449 | |
450 /* Get the parent process id (we're the parent of the audio thread) */ | |
451 parent = getpid(); | |
452 | |
453 /* We're ready to rock and roll. :-) */ | |
454 return(0); | |
455 } |