SDL  2.0
SDL_audio.c
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1 /*
2  Simple DirectMedia Layer
3  Copyright (C) 1997-2019 Sam Lantinga <slouken@libsdl.org>
4 
5  This software is provided 'as-is', without any express or implied
6  warranty. In no event will the authors be held liable for any damages
7  arising from the use of this software.
8 
9  Permission is granted to anyone to use this software for any purpose,
10  including commercial applications, and to alter it and redistribute it
11  freely, subject to the following restrictions:
12 
13  1. The origin of this software must not be misrepresented; you must not
14  claim that you wrote the original software. If you use this software
15  in a product, an acknowledgment in the product documentation would be
16  appreciated but is not required.
17  2. Altered source versions must be plainly marked as such, and must not be
18  misrepresented as being the original software.
19  3. This notice may not be removed or altered from any source distribution.
20 */
21 #include "../SDL_internal.h"
22 
23 /* Allow access to a raw mixing buffer */
24 
25 #include "SDL.h"
26 #include "SDL_audio.h"
27 #include "SDL_audio_c.h"
28 #include "SDL_sysaudio.h"
29 #include "../thread/SDL_systhread.h"
30 
31 #define _THIS SDL_AudioDevice *_this
32 
35 
36 /* Available audio drivers */
37 static const AudioBootStrap *const bootstrap[] = {
38 #if SDL_AUDIO_DRIVER_PULSEAUDIO
40 #endif
41 #if SDL_AUDIO_DRIVER_ALSA
43 #endif
44 #if SDL_AUDIO_DRIVER_SNDIO
46 #endif
47 #if SDL_AUDIO_DRIVER_NETBSD
49 #endif
50 #if SDL_AUDIO_DRIVER_OSS
52 #endif
53 #if SDL_AUDIO_DRIVER_QSA
55 #endif
56 #if SDL_AUDIO_DRIVER_SUNAUDIO
58 #endif
59 #if SDL_AUDIO_DRIVER_ARTS
61 #endif
62 #if SDL_AUDIO_DRIVER_ESD
64 #endif
65 #if SDL_AUDIO_DRIVER_NACL
67 #endif
68 #if SDL_AUDIO_DRIVER_NAS
70 #endif
71 #if SDL_AUDIO_DRIVER_WASAPI
73 #endif
74 #if SDL_AUDIO_DRIVER_DSOUND
76 #endif
77 #if SDL_AUDIO_DRIVER_WINMM
79 #endif
80 #if SDL_AUDIO_DRIVER_PAUDIO
82 #endif
83 #if SDL_AUDIO_DRIVER_HAIKU
85 #endif
86 #if SDL_AUDIO_DRIVER_COREAUDIO
88 #endif
89 #if SDL_AUDIO_DRIVER_FUSIONSOUND
91 #endif
92 #if SDL_AUDIO_DRIVER_OPENSLES
94 #endif
95 #if SDL_AUDIO_DRIVER_ANDROID
97 #endif
98 #if SDL_AUDIO_DRIVER_PSP
100 #endif
101 #if SDL_AUDIO_DRIVER_EMSCRIPTEN
103 #endif
104 #if SDL_AUDIO_DRIVER_JACK
106 #endif
107 #if SDL_AUDIO_DRIVER_DISK
109 #endif
110 #if SDL_AUDIO_DRIVER_DUMMY
112 #endif
113  NULL
114 };
115 
116 
117 #ifdef HAVE_LIBSAMPLERATE_H
118 #ifdef SDL_LIBSAMPLERATE_DYNAMIC
119 static void *SRC_lib = NULL;
120 #endif
121 SDL_bool SRC_available = SDL_FALSE;
122 int SRC_converter = 0;
123 SRC_STATE* (*SRC_src_new)(int converter_type, int channels, int *error) = NULL;
124 int (*SRC_src_process)(SRC_STATE *state, SRC_DATA *data) = NULL;
125 int (*SRC_src_reset)(SRC_STATE *state) = NULL;
126 SRC_STATE* (*SRC_src_delete)(SRC_STATE *state) = NULL;
127 const char* (*SRC_src_strerror)(int error) = NULL;
128 
129 static SDL_bool
130 LoadLibSampleRate(void)
131 {
132  const char *hint = SDL_GetHint(SDL_HINT_AUDIO_RESAMPLING_MODE);
133 
134  SRC_available = SDL_FALSE;
135  SRC_converter = 0;
136 
137  if (!hint || *hint == '0' || SDL_strcasecmp(hint, "default") == 0) {
138  return SDL_FALSE; /* don't load anything. */
139  } else if (*hint == '1' || SDL_strcasecmp(hint, "fast") == 0) {
140  SRC_converter = SRC_SINC_FASTEST;
141  } else if (*hint == '2' || SDL_strcasecmp(hint, "medium") == 0) {
142  SRC_converter = SRC_SINC_MEDIUM_QUALITY;
143  } else if (*hint == '3' || SDL_strcasecmp(hint, "best") == 0) {
144  SRC_converter = SRC_SINC_BEST_QUALITY;
145  } else {
146  return SDL_FALSE; /* treat it like "default", don't load anything. */
147  }
148 
149 #ifdef SDL_LIBSAMPLERATE_DYNAMIC
150  SDL_assert(SRC_lib == NULL);
152  if (!SRC_lib) {
153  SDL_ClearError();
154  return SDL_FALSE;
155  }
156 
157  SRC_src_new = (SRC_STATE* (*)(int converter_type, int channels, int *error))SDL_LoadFunction(SRC_lib, "src_new");
158  SRC_src_process = (int (*)(SRC_STATE *state, SRC_DATA *data))SDL_LoadFunction(SRC_lib, "src_process");
159  SRC_src_reset = (int(*)(SRC_STATE *state))SDL_LoadFunction(SRC_lib, "src_reset");
160  SRC_src_delete = (SRC_STATE* (*)(SRC_STATE *state))SDL_LoadFunction(SRC_lib, "src_delete");
161  SRC_src_strerror = (const char* (*)(int error))SDL_LoadFunction(SRC_lib, "src_strerror");
162 
163  if (!SRC_src_new || !SRC_src_process || !SRC_src_reset || !SRC_src_delete || !SRC_src_strerror) {
164  SDL_UnloadObject(SRC_lib);
165  SRC_lib = NULL;
166  return SDL_FALSE;
167  }
168 #else
169  SRC_src_new = src_new;
170  SRC_src_process = src_process;
171  SRC_src_reset = src_reset;
172  SRC_src_delete = src_delete;
173  SRC_src_strerror = src_strerror;
174 #endif
175 
176  SRC_available = SDL_TRUE;
177  return SDL_TRUE;
178 }
179 
180 static void
181 UnloadLibSampleRate(void)
182 {
183 #ifdef SDL_LIBSAMPLERATE_DYNAMIC
184  if (SRC_lib != NULL) {
185  SDL_UnloadObject(SRC_lib);
186  }
187  SRC_lib = NULL;
188 #endif
189 
190  SRC_available = SDL_FALSE;
191  SRC_src_new = NULL;
192  SRC_src_process = NULL;
193  SRC_src_reset = NULL;
194  SRC_src_delete = NULL;
195  SRC_src_strerror = NULL;
196 }
197 #endif
198 
199 static SDL_AudioDevice *
201 {
202  id--;
203  if ((id >= SDL_arraysize(open_devices)) || (open_devices[id] == NULL)) {
204  SDL_SetError("Invalid audio device ID");
205  return NULL;
206  }
207 
208  return open_devices[id];
209 }
210 
211 
212 /* stubs for audio drivers that don't need a specific entry point... */
213 static void
215 {
216  /* you have to write your own implementation if these assertions fail. */
219 
220  SDL_AddAudioDevice(SDL_FALSE, DEFAULT_OUTPUT_DEVNAME, (void *) ((size_t) 0x1));
222  SDL_AddAudioDevice(SDL_TRUE, DEFAULT_INPUT_DEVNAME, (void *) ((size_t) 0x2));
223  }
224 }
225 
226 static void
228 { /* no-op. */
229 }
230 
231 static void
233 { /* no-op. */
234 }
235 
236 static void
238 { /* no-op. */
239 }
240 
241 static void
243 { /* no-op. */
244 }
245 
246 static void
248 { /* no-op. */
249 }
250 
251 static Uint8 *
253 {
254  return NULL;
255 }
256 
257 static int
259 {
260  return -1; /* just fail immediately. */
261 }
262 
263 static void
265 { /* no-op. */
266 }
267 
268 static void
270 { /* no-op. */
271 }
272 
273 static void
275 { /* no-op. */
276 }
277 
278 static void
280 { /* no-op. */
281 }
282 
283 static void
285 { /* no-op. */
286 }
287 
288 
289 static int
290 SDL_AudioOpenDevice_Default(_THIS, void *handle, const char *devname, int iscapture)
291 {
292  return SDL_Unsupported();
293 }
294 
295 static SDL_INLINE SDL_bool
297 {
298  /* The device thread locks the same mutex, but not through the public API.
299  This check is in case the application, in the audio callback,
300  tries to lock the thread that we've already locked from the
301  device thread...just in case we only have non-recursive mutexes. */
302  if (device->thread && (SDL_ThreadID() == device->threadid)) {
303  return SDL_TRUE;
304  }
305 
306  return SDL_FALSE;
307 }
308 
309 static void
311 {
313  SDL_LockMutex(device->mixer_lock);
314  }
315 }
316 
317 static void
319 {
321  SDL_UnlockMutex(device->mixer_lock);
322  }
323 }
324 
325 static void
327 {
328 }
329 
330 static void
332 {
333  /*
334  * Fill in stub functions for unused driver entry points. This lets us
335  * blindly call them without having to check for validity first.
336  */
337 
341  }
344  }
345  }
346 
347 #define FILL_STUB(x) \
348  if (current_audio.impl.x == NULL) { \
349  current_audio.impl.x = SDL_Audio##x##_Default; \
350  }
351  FILL_STUB(DetectDevices);
352  FILL_STUB(OpenDevice);
353  FILL_STUB(ThreadInit);
354  FILL_STUB(ThreadDeinit);
355  FILL_STUB(BeginLoopIteration);
356  FILL_STUB(WaitDevice);
357  FILL_STUB(PlayDevice);
358  FILL_STUB(GetDeviceBuf);
359  FILL_STUB(CaptureFromDevice);
360  FILL_STUB(FlushCapture);
361  FILL_STUB(PrepareToClose);
362  FILL_STUB(CloseDevice);
363  FILL_STUB(LockDevice);
364  FILL_STUB(UnlockDevice);
365  FILL_STUB(FreeDeviceHandle);
366  FILL_STUB(Deinitialize);
367 #undef FILL_STUB
368 }
369 
370 
371 /* device hotplug support... */
372 
373 static int
374 add_audio_device(const char *name, void *handle, SDL_AudioDeviceItem **devices, int *devCount)
375 {
376  int retval = -1;
377  SDL_AudioDeviceItem *item;
378  const SDL_AudioDeviceItem *i;
379  int dupenum = 0;
380 
381  SDL_assert(handle != NULL); /* we reserve NULL, audio backends can't use it. */
382  SDL_assert(name != NULL);
383 
385  if (!item) {
386  return SDL_OutOfMemory();
387  }
388 
389  item->original_name = SDL_strdup(name);
390  if (!item->original_name) {
391  SDL_free(item);
392  return SDL_OutOfMemory();
393  }
394 
395  item->dupenum = 0;
396  item->name = item->original_name;
397  item->handle = handle;
398 
400 
401  for (i = *devices; i != NULL; i = i->next) {
402  if (SDL_strcmp(name, i->original_name) == 0) {
403  dupenum = i->dupenum + 1;
404  break; /* stop at the highest-numbered dupe. */
405  }
406  }
407 
408  if (dupenum) {
409  const size_t len = SDL_strlen(name) + 16;
410  char *replacement = (char *) SDL_malloc(len);
411  if (!replacement) {
413  SDL_free(item->original_name);
414  SDL_free(item);
415  SDL_OutOfMemory();
416  return -1;
417  }
418 
419  SDL_snprintf(replacement, len, "%s (%d)", name, dupenum + 1);
420  item->dupenum = dupenum;
421  item->name = replacement;
422  }
423 
424  item->next = *devices;
425  *devices = item;
426  retval = (*devCount)++; /* !!! FIXME: this should be an atomic increment */
427 
429 
430  return retval;
431 }
432 
433 static SDL_INLINE int
434 add_capture_device(const char *name, void *handle)
435 {
438 }
439 
440 static SDL_INLINE int
441 add_output_device(const char *name, void *handle)
442 {
444 }
445 
446 static void
448 {
449  SDL_AudioDeviceItem *item, *next;
450  for (item = *devices; item != NULL; item = next) {
451  next = item->next;
452  if (item->handle != NULL) {
454  }
455  /* these two pointers are the same if not a duplicate devname */
456  if (item->name != item->original_name) {
457  SDL_free(item->name);
458  }
459  SDL_free(item->original_name);
460  SDL_free(item);
461  }
462  *devices = NULL;
463  *devCount = 0;
464 }
465 
466 
467 /* The audio backends call this when a new device is plugged in. */
468 void
469 SDL_AddAudioDevice(const int iscapture, const char *name, void *handle)
470 {
471  const int device_index = iscapture ? add_capture_device(name, handle) : add_output_device(name, handle);
472  if (device_index != -1) {
473  /* Post the event, if desired */
476  SDL_zero(event);
477  event.adevice.type = SDL_AUDIODEVICEADDED;
478  event.adevice.which = device_index;
479  event.adevice.iscapture = iscapture;
481  }
482  }
483 }
484 
485 /* The audio backends call this when a currently-opened device is lost. */
487 {
489 
490  if (!SDL_AtomicGet(&device->enabled)) {
491  return; /* don't report disconnects more than once. */
492  }
493 
494  if (SDL_AtomicGet(&device->shutdown)) {
495  return; /* don't report disconnect if we're trying to close device. */
496  }
497 
498  /* Ends the audio callback and mark the device as STOPPED, but the
499  app still needs to close the device to free resources. */
501  SDL_AtomicSet(&device->enabled, 0);
503 
504  /* Post the event, if desired */
507  SDL_zero(event);
508  event.adevice.type = SDL_AUDIODEVICEREMOVED;
509  event.adevice.which = device->id;
510  event.adevice.iscapture = device->iscapture ? 1 : 0;
512  }
513 }
514 
515 static void
517 {
518  SDL_AudioDeviceItem *item;
519  SDL_assert(handle != NULL);
520  for (item = devices; item != NULL; item = item->next) {
521  if (item->handle == handle) {
522  item->handle = NULL;
523  *removedFlag = SDL_TRUE;
524  return;
525  }
526  }
527 }
528 
529 /* The audio backends call this when a device is removed from the system. */
530 void
531 SDL_RemoveAudioDevice(const int iscapture, void *handle)
532 {
533  int device_index;
535 
537  if (iscapture) {
539  } else {
541  }
542  for (device_index = 0; device_index < SDL_arraysize(open_devices); device_index++)
543  {
544  device = open_devices[device_index];
545  if (device != NULL && device->handle == handle)
546  {
548  break;
549  }
550  }
552 
554 }
555 
556 
557 
558 /* buffer queueing support... */
559 
560 static void SDLCALL
562 {
563  /* this function always holds the mixer lock before being called. */
564  SDL_AudioDevice *device = (SDL_AudioDevice *) userdata;
565  size_t dequeued;
566 
567  SDL_assert(device != NULL); /* this shouldn't ever happen, right?! */
568  SDL_assert(!device->iscapture); /* this shouldn't ever happen, right?! */
569  SDL_assert(len >= 0); /* this shouldn't ever happen, right?! */
570 
571  dequeued = SDL_ReadFromDataQueue(device->buffer_queue, stream, len);
572  stream += dequeued;
573  len -= (int) dequeued;
574 
575  if (len > 0) { /* fill any remaining space in the stream with silence. */
576  SDL_assert(SDL_CountDataQueue(device->buffer_queue) == 0);
577  SDL_memset(stream, device->spec.silence, len);
578  }
579 }
580 
581 static void SDLCALL
583 {
584  /* this function always holds the mixer lock before being called. */
585  SDL_AudioDevice *device = (SDL_AudioDevice *) userdata;
586 
587  SDL_assert(device != NULL); /* this shouldn't ever happen, right?! */
588  SDL_assert(device->iscapture); /* this shouldn't ever happen, right?! */
589  SDL_assert(len >= 0); /* this shouldn't ever happen, right?! */
590 
591  /* note that if this needs to allocate more space and run out of memory,
592  we have no choice but to quietly drop the data and hope it works out
593  later, but you probably have bigger problems in this case anyhow. */
594  SDL_WriteToDataQueue(device->buffer_queue, stream, len);
595 }
596 
597 int
599 {
601  int rc = 0;
602 
603  if (!device) {
604  return -1; /* get_audio_device() will have set the error state */
605  } else if (device->iscapture) {
606  return SDL_SetError("This is a capture device, queueing not allowed");
607  } else if (device->callbackspec.callback != SDL_BufferQueueDrainCallback) {
608  return SDL_SetError("Audio device has a callback, queueing not allowed");
609  }
610 
611  if (len > 0) {
613  rc = SDL_WriteToDataQueue(device->buffer_queue, data, len);
615  }
616 
617  return rc;
618 }
619 
620 Uint32
622 {
624  Uint32 rc;
625 
626  if ( (len == 0) || /* nothing to do? */
627  (!device) || /* called with bogus device id */
628  (!device->iscapture) || /* playback devices can't dequeue */
629  (device->callbackspec.callback != SDL_BufferQueueFillCallback) ) { /* not set for queueing */
630  return 0; /* just report zero bytes dequeued. */
631  }
632 
634  rc = (Uint32) SDL_ReadFromDataQueue(device->buffer_queue, data, len);
636  return rc;
637 }
638 
639 Uint32
641 {
642  Uint32 retval = 0;
644 
645  if (!device) {
646  return 0;
647  }
648 
649  /* Nothing to do unless we're set up for queueing. */
650  if (device->callbackspec.callback == SDL_BufferQueueDrainCallback ||
651  device->callbackspec.callback == SDL_BufferQueueFillCallback)
652  {
654  retval = (Uint32) SDL_CountDataQueue(device->buffer_queue);
656  }
657 
658  return retval;
659 }
660 
661 void
663 {
665 
666  if (!device) {
667  return; /* nothing to do. */
668  }
669 
670  /* Blank out the device and release the mutex. Free it afterwards. */
672 
673  /* Keep up to two packets in the pool to reduce future malloc pressure. */
675 
677 }
678 
679 
680 /* The general mixing thread function */
681 static int SDLCALL
682 SDL_RunAudio(void *devicep)
683 {
684  SDL_AudioDevice *device = (SDL_AudioDevice *) devicep;
685  void *udata = device->callbackspec.userdata;
686  SDL_AudioCallback callback = device->callbackspec.callback;
687  int data_len = 0;
688  Uint8 *data;
689 
690  SDL_assert(!device->iscapture);
691 
692 #if SDL_AUDIO_DRIVER_ANDROID
693  {
694  /* Set thread priority to THREAD_PRIORITY_AUDIO */
695  extern void Android_JNI_AudioSetThreadPriority(int, int);
697  }
698 #else
699  /* The audio mixing is always a high priority thread */
701 #endif
702 
703  /* Perform any thread setup */
704  device->threadid = SDL_ThreadID();
706 
707  /* Loop, filling the audio buffers */
708  while (!SDL_AtomicGet(&device->shutdown)) {
710  data_len = device->callbackspec.size;
711 
712  /* Fill the current buffer with sound */
713  if (!device->stream && SDL_AtomicGet(&device->enabled)) {
714  SDL_assert(data_len == device->spec.size);
716  } else {
717  /* if the device isn't enabled, we still write to the
718  work_buffer, so the app's callback will fire with
719  a regular frequency, in case they depend on that
720  for timing or progress. They can use hotplug
721  now to know if the device failed.
722  Streaming playback uses work_buffer, too. */
723  data = NULL;
724  }
725 
726  if (data == NULL) {
727  data = device->work_buffer;
728  }
729 
730  /* !!! FIXME: this should be LockDevice. */
731  SDL_LockMutex(device->mixer_lock);
732  if (SDL_AtomicGet(&device->paused)) {
733  SDL_memset(data, device->spec.silence, data_len);
734  } else {
735  callback(udata, data, data_len);
736  }
737  SDL_UnlockMutex(device->mixer_lock);
738 
739  if (device->stream) {
740  /* Stream available audio to device, converting/resampling. */
741  /* if this fails...oh well. We'll play silence here. */
742  SDL_AudioStreamPut(device->stream, data, data_len);
743 
744  while (SDL_AudioStreamAvailable(device->stream) >= ((int) device->spec.size)) {
745  int got;
747  got = SDL_AudioStreamGet(device->stream, data ? data : device->work_buffer, device->spec.size);
748  SDL_assert((got < 0) || (got == device->spec.size));
749 
750  if (data == NULL) { /* device is having issues... */
751  const Uint32 delay = ((device->spec.samples * 1000) / device->spec.freq);
752  SDL_Delay(delay); /* wait for as long as this buffer would have played. Maybe device recovers later? */
753  } else {
754  if (got != device->spec.size) {
755  SDL_memset(data, device->spec.silence, device->spec.size);
756  }
759  }
760  }
761  } else if (data == device->work_buffer) {
762  /* nothing to do; pause like we queued a buffer to play. */
763  const Uint32 delay = ((device->spec.samples * 1000) / device->spec.freq);
764  SDL_Delay(delay);
765  } else { /* writing directly to the device. */
766  /* queue this buffer and wait for it to finish playing. */
769  }
770  }
771 
773 
774  /* Wait for the audio to drain. */
775  SDL_Delay(((device->spec.samples * 1000) / device->spec.freq) * 2);
776 
778 
779  return 0;
780 }
781 
782 /* !!! FIXME: this needs to deal with device spec changes. */
783 /* The general capture thread function */
784 static int SDLCALL
785 SDL_CaptureAudio(void *devicep)
786 {
787  SDL_AudioDevice *device = (SDL_AudioDevice *) devicep;
788  const int silence = (int) device->spec.silence;
789  const Uint32 delay = ((device->spec.samples * 1000) / device->spec.freq);
790  const int data_len = device->spec.size;
791  Uint8 *data;
792  void *udata = device->callbackspec.userdata;
793  SDL_AudioCallback callback = device->callbackspec.callback;
794 
795  SDL_assert(device->iscapture);
796 
797 #if SDL_AUDIO_DRIVER_ANDROID
798  {
799  /* Set thread priority to THREAD_PRIORITY_AUDIO */
800  extern void Android_JNI_AudioSetThreadPriority(int, int);
802  }
803 #else
804  /* The audio mixing is always a high priority thread */
806 #endif
807 
808  /* Perform any thread setup */
809  device->threadid = SDL_ThreadID();
811 
812  /* Loop, filling the audio buffers */
813  while (!SDL_AtomicGet(&device->shutdown)) {
814  int still_need;
815  Uint8 *ptr;
816 
818 
819  if (SDL_AtomicGet(&device->paused)) {
820  SDL_Delay(delay); /* just so we don't cook the CPU. */
821  if (device->stream) {
822  SDL_AudioStreamClear(device->stream);
823  }
824  current_audio.impl.FlushCapture(device); /* dump anything pending. */
825  continue;
826  }
827 
828  /* Fill the current buffer with sound */
829  still_need = data_len;
830 
831  /* Use the work_buffer to hold data read from the device. */
832  data = device->work_buffer;
833  SDL_assert(data != NULL);
834 
835  ptr = data;
836 
837  /* We still read from the device when "paused" to keep the state sane,
838  and block when there isn't data so this thread isn't eating CPU.
839  But we don't process it further or call the app's callback. */
840 
841  if (!SDL_AtomicGet(&device->enabled)) {
842  SDL_Delay(delay); /* try to keep callback firing at normal pace. */
843  } else {
844  while (still_need > 0) {
845  const int rc = current_audio.impl.CaptureFromDevice(device, ptr, still_need);
846  SDL_assert(rc <= still_need); /* device should not overflow buffer. :) */
847  if (rc > 0) {
848  still_need -= rc;
849  ptr += rc;
850  } else { /* uhoh, device failed for some reason! */
852  break;
853  }
854  }
855  }
856 
857  if (still_need > 0) {
858  /* Keep any data we already read, silence the rest. */
859  SDL_memset(ptr, silence, still_need);
860  }
861 
862  if (device->stream) {
863  /* if this fails...oh well. */
864  SDL_AudioStreamPut(device->stream, data, data_len);
865 
866  while (SDL_AudioStreamAvailable(device->stream) >= ((int) device->callbackspec.size)) {
867  const int got = SDL_AudioStreamGet(device->stream, device->work_buffer, device->callbackspec.size);
868  SDL_assert((got < 0) || (got == device->callbackspec.size));
869  if (got != device->callbackspec.size) {
870  SDL_memset(device->work_buffer, device->spec.silence, device->callbackspec.size);
871  }
872 
873  /* !!! FIXME: this should be LockDevice. */
874  SDL_LockMutex(device->mixer_lock);
875  if (!SDL_AtomicGet(&device->paused)) {
876  callback(udata, device->work_buffer, device->callbackspec.size);
877  }
878  SDL_UnlockMutex(device->mixer_lock);
879  }
880  } else { /* feeding user callback directly without streaming. */
881  /* !!! FIXME: this should be LockDevice. */
882  SDL_LockMutex(device->mixer_lock);
883  if (!SDL_AtomicGet(&device->paused)) {
884  callback(udata, data, device->callbackspec.size);
885  }
886  SDL_UnlockMutex(device->mixer_lock);
887  }
888  }
889 
891 
893 
894  return 0;
895 }
896 
897 
898 static SDL_AudioFormat
899 SDL_ParseAudioFormat(const char *string)
900 {
901 #define CHECK_FMT_STRING(x) if (SDL_strcmp(string, #x) == 0) return AUDIO_##x
902  CHECK_FMT_STRING(U8);
903  CHECK_FMT_STRING(S8);
904  CHECK_FMT_STRING(U16LSB);
905  CHECK_FMT_STRING(S16LSB);
906  CHECK_FMT_STRING(U16MSB);
907  CHECK_FMT_STRING(S16MSB);
908  CHECK_FMT_STRING(U16SYS);
909  CHECK_FMT_STRING(S16SYS);
910  CHECK_FMT_STRING(U16);
911  CHECK_FMT_STRING(S16);
912  CHECK_FMT_STRING(S32LSB);
913  CHECK_FMT_STRING(S32MSB);
914  CHECK_FMT_STRING(S32SYS);
916  CHECK_FMT_STRING(F32LSB);
917  CHECK_FMT_STRING(F32MSB);
918  CHECK_FMT_STRING(F32SYS);
919  CHECK_FMT_STRING(F32);
920 #undef CHECK_FMT_STRING
921  return 0;
922 }
923 
924 int
926 {
927  return SDL_arraysize(bootstrap) - 1;
928 }
929 
930 const char *
932 {
933  if (index >= 0 && index < SDL_GetNumAudioDrivers()) {
934  return bootstrap[index]->name;
935  }
936  return NULL;
937 }
938 
939 int
940 SDL_AudioInit(const char *driver_name)
941 {
942  int i = 0;
943  int initialized = 0;
944  int tried_to_init = 0;
945 
947  SDL_AudioQuit(); /* shutdown driver if already running. */
948  }
949 
952 
953  /* Select the proper audio driver */
954  if (driver_name == NULL) {
955  driver_name = SDL_getenv("SDL_AUDIODRIVER");
956  }
957 
958  for (i = 0; (!initialized) && (bootstrap[i]); ++i) {
959  /* make sure we should even try this driver before doing so... */
960  const AudioBootStrap *backend = bootstrap[i];
961  if ((driver_name && (SDL_strncasecmp(backend->name, driver_name, SDL_strlen(driver_name)) != 0)) ||
962  (!driver_name && backend->demand_only)) {
963  continue;
964  }
965 
966  tried_to_init = 1;
968  current_audio.name = backend->name;
969  current_audio.desc = backend->desc;
970  initialized = backend->init(&current_audio.impl);
971  }
972 
973  if (!initialized) {
974  /* specific drivers will set the error message if they fail... */
975  if (!tried_to_init) {
976  if (driver_name) {
977  SDL_SetError("Audio target '%s' not available", driver_name);
978  } else {
979  SDL_SetError("No available audio device");
980  }
981  }
982 
984  return -1; /* No driver was available, so fail. */
985  }
986 
988 
990 
991  /* Make sure we have a list of devices available at startup. */
993 
994 #ifdef HAVE_LIBSAMPLERATE_H
995  LoadLibSampleRate();
996 #endif
997 
998  return 0;
999 }
1000 
1001 /*
1002  * Get the current audio driver name
1003  */
1004 const char *
1006 {
1007  return current_audio.name;
1008 }
1009 
1010 /* Clean out devices that we've removed but had to keep around for stability. */
1011 static void
1013 {
1014  SDL_AudioDeviceItem *item = *devices;
1015  SDL_AudioDeviceItem *prev = NULL;
1016  int total = 0;
1017 
1018  while (item) {
1019  SDL_AudioDeviceItem *next = item->next;
1020  if (item->handle != NULL) {
1021  total++;
1022  prev = item;
1023  } else {
1024  if (prev) {
1025  prev->next = next;
1026  } else {
1027  *devices = next;
1028  }
1029  /* these two pointers are the same if not a duplicate devname */
1030  if (item->name != item->original_name) {
1031  SDL_free(item->name);
1032  }
1033  SDL_free(item->original_name);
1034  SDL_free(item);
1035  }
1036  item = next;
1037  }
1038 
1039  *devCount = total;
1040  *removedFlag = SDL_FALSE;
1041 }
1042 
1043 
1044 int
1046 {
1047  int retval = 0;
1048 
1049  if (!SDL_WasInit(SDL_INIT_AUDIO)) {
1050  return -1;
1051  }
1052 
1054  if (iscapture && current_audio.captureDevicesRemoved) {
1056  }
1057 
1058  if (!iscapture && current_audio.outputDevicesRemoved) {
1060  }
1061 
1064 
1065  return retval;
1066 }
1067 
1068 
1069 const char *
1070 SDL_GetAudioDeviceName(int index, int iscapture)
1071 {
1072  const char *retval = NULL;
1073 
1074  if (!SDL_WasInit(SDL_INIT_AUDIO)) {
1075  SDL_SetError("Audio subsystem is not initialized");
1076  return NULL;
1077  }
1078 
1079  if ((iscapture) && (!current_audio.impl.HasCaptureSupport)) {
1080  SDL_SetError("No capture support");
1081  return NULL;
1082  }
1083 
1084  if (index >= 0) {
1085  SDL_AudioDeviceItem *item;
1086  int i;
1087 
1091  if (index < i) {
1092  for (i--; i > index; i--, item = item->next) {
1093  SDL_assert(item != NULL);
1094  }
1095  SDL_assert(item != NULL);
1096  retval = item->name;
1097  }
1099  }
1100 
1101  if (retval == NULL) {
1102  SDL_SetError("No such device");
1103  }
1104 
1105  return retval;
1106 }
1107 
1108 
1109 static void
1111 {
1112  if (!device) {
1113  return;
1114  }
1115 
1116  /* make sure the device is paused before we do anything else, so the
1117  audio callback definitely won't fire again. */
1119  SDL_AtomicSet(&device->paused, 1);
1120  SDL_AtomicSet(&device->shutdown, 1);
1121  SDL_AtomicSet(&device->enabled, 0);
1123 
1124  if (device->thread != NULL) {
1125  SDL_WaitThread(device->thread, NULL);
1126  }
1127  if (device->mixer_lock != NULL) {
1128  SDL_DestroyMutex(device->mixer_lock);
1129  }
1130 
1131  SDL_free(device->work_buffer);
1132  SDL_FreeAudioStream(device->stream);
1133 
1134  if (device->id > 0) {
1135  SDL_AudioDevice *opendev = open_devices[device->id - 1];
1136  SDL_assert((opendev == device) || (opendev == NULL));
1137  if (opendev == device) {
1138  open_devices[device->id - 1] = NULL;
1139  }
1140  }
1141 
1142  if (device->hidden != NULL) {
1144  }
1145 
1146  SDL_FreeDataQueue(device->buffer_queue);
1147 
1148  SDL_free(device);
1149 }
1150 
1151 
1152 /*
1153  * Sanity check desired AudioSpec for SDL_OpenAudio() in (orig).
1154  * Fills in a sanitized copy in (prepared).
1155  * Returns non-zero if okay, zero on fatal parameters in (orig).
1156  */
1157 static int
1159 {
1160  SDL_memcpy(prepared, orig, sizeof(SDL_AudioSpec));
1161 
1162  if (orig->freq == 0) {
1163  const char *env = SDL_getenv("SDL_AUDIO_FREQUENCY");
1164  if ((!env) || ((prepared->freq = SDL_atoi(env)) == 0)) {
1165  prepared->freq = 22050; /* a reasonable default */
1166  }
1167  }
1168 
1169  if (orig->format == 0) {
1170  const char *env = SDL_getenv("SDL_AUDIO_FORMAT");
1171  if ((!env) || ((prepared->format = SDL_ParseAudioFormat(env)) == 0)) {
1172  prepared->format = AUDIO_S16; /* a reasonable default */
1173  }
1174  }
1175 
1176  switch (orig->channels) {
1177  case 0:{
1178  const char *env = SDL_getenv("SDL_AUDIO_CHANNELS");
1179  if ((!env) || ((prepared->channels = (Uint8) SDL_atoi(env)) == 0)) {
1180  prepared->channels = 2; /* a reasonable default */
1181  }
1182  break;
1183  }
1184  case 1: /* Mono */
1185  case 2: /* Stereo */
1186  case 4: /* Quadrophonic */
1187  case 6: /* 5.1 surround */
1188  case 8: /* 7.1 surround */
1189  break;
1190  default:
1191  SDL_SetError("Unsupported number of audio channels.");
1192  return 0;
1193  }
1194 
1195  if (orig->samples == 0) {
1196  const char *env = SDL_getenv("SDL_AUDIO_SAMPLES");
1197  if ((!env) || ((prepared->samples = (Uint16) SDL_atoi(env)) == 0)) {
1198  /* Pick a default of ~46 ms at desired frequency */
1199  /* !!! FIXME: remove this when the non-Po2 resampling is in. */
1200  const int samples = (prepared->freq / 1000) * 46;
1201  int power2 = 1;
1202  while (power2 < samples) {
1203  power2 *= 2;
1204  }
1205  prepared->samples = power2;
1206  }
1207  }
1208 
1209  /* Calculate the silence and size of the audio specification */
1210  SDL_CalculateAudioSpec(prepared);
1211 
1212  return 1;
1213 }
1214 
1215 static SDL_AudioDeviceID
1216 open_audio_device(const char *devname, int iscapture,
1217  const SDL_AudioSpec * desired, SDL_AudioSpec * obtained,
1218  int allowed_changes, int min_id)
1219 {
1220  const SDL_bool is_internal_thread = (desired->callback == NULL);
1221  SDL_AudioDeviceID id = 0;
1222  SDL_AudioSpec _obtained;
1224  SDL_bool build_stream;
1225  void *handle = NULL;
1226  int i = 0;
1227 
1228  if (!SDL_WasInit(SDL_INIT_AUDIO)) {
1229  SDL_SetError("Audio subsystem is not initialized");
1230  return 0;
1231  }
1232 
1233  if ((iscapture) && (!current_audio.impl.HasCaptureSupport)) {
1234  SDL_SetError("No capture support");
1235  return 0;
1236  }
1237 
1238  /* !!! FIXME: there is a race condition here if two devices open from two threads at once. */
1239  /* Find an available device ID... */
1240  for (id = min_id - 1; id < SDL_arraysize(open_devices); id++) {
1241  if (open_devices[id] == NULL) {
1242  break;
1243  }
1244  }
1245 
1246  if (id == SDL_arraysize(open_devices)) {
1247  SDL_SetError("Too many open audio devices");
1248  return 0;
1249  }
1250 
1251  if (!obtained) {
1252  obtained = &_obtained;
1253  }
1254  if (!prepare_audiospec(desired, obtained)) {
1255  return 0;
1256  }
1257 
1258  /* If app doesn't care about a specific device, let the user override. */
1259  if (devname == NULL) {
1260  devname = SDL_getenv("SDL_AUDIO_DEVICE_NAME");
1261  }
1262 
1263  /*
1264  * Catch device names at the high level for the simple case...
1265  * This lets us have a basic "device enumeration" for systems that
1266  * don't have multiple devices, but makes sure the device name is
1267  * always NULL when it hits the low level.
1268  *
1269  * Also make sure that the simple case prevents multiple simultaneous
1270  * opens of the default system device.
1271  */
1272 
1273  if ((iscapture) && (current_audio.impl.OnlyHasDefaultCaptureDevice)) {
1274  if ((devname) && (SDL_strcmp(devname, DEFAULT_INPUT_DEVNAME) != 0)) {
1275  SDL_SetError("No such device");
1276  return 0;
1277  }
1278  devname = NULL;
1279 
1280  for (i = 0; i < SDL_arraysize(open_devices); i++) {
1281  if ((open_devices[i]) && (open_devices[i]->iscapture)) {
1282  SDL_SetError("Audio device already open");
1283  return 0;
1284  }
1285  }
1286  } else if ((!iscapture) && (current_audio.impl.OnlyHasDefaultOutputDevice)) {
1287  if ((devname) && (SDL_strcmp(devname, DEFAULT_OUTPUT_DEVNAME) != 0)) {
1288  SDL_SetError("No such device");
1289  return 0;
1290  }
1291  devname = NULL;
1292 
1293  for (i = 0; i < SDL_arraysize(open_devices); i++) {
1294  if ((open_devices[i]) && (!open_devices[i]->iscapture)) {
1295  SDL_SetError("Audio device already open");
1296  return 0;
1297  }
1298  }
1299  } else if (devname != NULL) {
1300  /* if the app specifies an exact string, we can pass the backend
1301  an actual device handle thingey, which saves them the effort of
1302  figuring out what device this was (such as, reenumerating
1303  everything again to find the matching human-readable name).
1304  It might still need to open a device based on the string for,
1305  say, a network audio server, but this optimizes some cases. */
1306  SDL_AudioDeviceItem *item;
1308  for (item = iscapture ? current_audio.inputDevices : current_audio.outputDevices; item; item = item->next) {
1309  if ((item->handle != NULL) && (SDL_strcmp(item->name, devname) == 0)) {
1310  handle = item->handle;
1311  break;
1312  }
1313  }
1315  }
1316 
1318  /* has to be in our device list, or the default device. */
1319  if ((handle == NULL) && (devname != NULL)) {
1320  SDL_SetError("No such device.");
1321  return 0;
1322  }
1323  }
1324 
1325  device = (SDL_AudioDevice *) SDL_calloc(1, sizeof (SDL_AudioDevice));
1326  if (device == NULL) {
1327  SDL_OutOfMemory();
1328  return 0;
1329  }
1330  device->id = id + 1;
1331  device->spec = *obtained;
1332  device->iscapture = iscapture ? SDL_TRUE : SDL_FALSE;
1333  device->handle = handle;
1334 
1335  SDL_AtomicSet(&device->shutdown, 0); /* just in case. */
1336  SDL_AtomicSet(&device->paused, 1);
1337  SDL_AtomicSet(&device->enabled, 1);
1338 
1339  /* Create a mutex for locking the sound buffers */
1341  device->mixer_lock = SDL_CreateMutex();
1342  if (device->mixer_lock == NULL) {
1344  SDL_SetError("Couldn't create mixer lock");
1345  return 0;
1346  }
1347  }
1348 
1349  if (current_audio.impl.OpenDevice(device, handle, devname, iscapture) < 0) {
1351  return 0;
1352  }
1353 
1354  /* if your target really doesn't need it, set it to 0x1 or something. */
1355  /* otherwise, close_audio_device() won't call impl.CloseDevice(). */
1356  SDL_assert(device->hidden != NULL);
1357 
1358  /* See if we need to do any conversion */
1359  build_stream = SDL_FALSE;
1360  if (obtained->freq != device->spec.freq) {
1361  if (allowed_changes & SDL_AUDIO_ALLOW_FREQUENCY_CHANGE) {
1362  obtained->freq = device->spec.freq;
1363  } else {
1364  build_stream = SDL_TRUE;
1365  }
1366  }
1367  if (obtained->format != device->spec.format) {
1368  if (allowed_changes & SDL_AUDIO_ALLOW_FORMAT_CHANGE) {
1369  obtained->format = device->spec.format;
1370  } else {
1371  build_stream = SDL_TRUE;
1372  }
1373  }
1374  if (obtained->channels != device->spec.channels) {
1375  if (allowed_changes & SDL_AUDIO_ALLOW_CHANNELS_CHANGE) {
1376  obtained->channels = device->spec.channels;
1377  } else {
1378  build_stream = SDL_TRUE;
1379  }
1380  }
1381  if (device->spec.samples != obtained->samples) {
1382  if (allowed_changes & SDL_AUDIO_ALLOW_SAMPLES_CHANGE) {
1383  obtained->samples = device->spec.samples;
1384  } else {
1385  build_stream = SDL_TRUE;
1386  }
1387  }
1388 
1389  SDL_CalculateAudioSpec(obtained); /* recalc after possible changes. */
1390 
1391  device->callbackspec = *obtained;
1392 
1393  if (build_stream) {
1394  if (iscapture) {
1395  device->stream = SDL_NewAudioStream(device->spec.format,
1396  device->spec.channels, device->spec.freq,
1397  obtained->format, obtained->channels, obtained->freq);
1398  } else {
1399  device->stream = SDL_NewAudioStream(obtained->format, obtained->channels,
1400  obtained->freq, device->spec.format,
1401  device->spec.channels, device->spec.freq);
1402  }
1403 
1404  if (!device->stream) {
1406  return 0;
1407  }
1408  }
1409 
1410  if (device->spec.callback == NULL) { /* use buffer queueing? */
1411  /* pool a few packets to start. Enough for two callbacks. */
1412  device->buffer_queue = SDL_NewDataQueue(SDL_AUDIOBUFFERQUEUE_PACKETLEN, obtained->size * 2);
1413  if (!device->buffer_queue) {
1415  SDL_SetError("Couldn't create audio buffer queue");
1416  return 0;
1417  }
1418  device->callbackspec.callback = iscapture ? SDL_BufferQueueFillCallback : SDL_BufferQueueDrainCallback;
1419  device->callbackspec.userdata = device;
1420  }
1421 
1422  /* Allocate a scratch audio buffer */
1423  device->work_buffer_len = build_stream ? device->callbackspec.size : 0;
1424  if (device->spec.size > device->work_buffer_len) {
1425  device->work_buffer_len = device->spec.size;
1426  }
1427  SDL_assert(device->work_buffer_len > 0);
1428 
1429  device->work_buffer = (Uint8 *) SDL_malloc(device->work_buffer_len);
1430  if (device->work_buffer == NULL) {
1432  SDL_OutOfMemory();
1433  return 0;
1434  }
1435 
1436  open_devices[id] = device; /* add it to our list of open devices. */
1437 
1438  /* Start the audio thread if necessary */
1440  /* Start the audio thread */
1441  /* !!! FIXME: we don't force the audio thread stack size here if it calls into user code, but maybe we should? */
1442  /* buffer queueing callback only needs a few bytes, so make the stack tiny. */
1443  const size_t stacksize = is_internal_thread ? 64 * 1024 : 0;
1444  char threadname[64];
1445 
1446  SDL_snprintf(threadname, sizeof (threadname), "SDLAudio%c%d", (iscapture) ? 'C' : 'P', (int) device->id);
1447  device->thread = SDL_CreateThreadInternal(iscapture ? SDL_CaptureAudio : SDL_RunAudio, threadname, stacksize, device);
1448 
1449  if (device->thread == NULL) {
1451  SDL_SetError("Couldn't create audio thread");
1452  return 0;
1453  }
1454  }
1455 
1456  return device->id;
1457 }
1458 
1459 
1460 int
1462 {
1463  SDL_AudioDeviceID id = 0;
1464 
1465  /* Start up the audio driver, if necessary. This is legacy behaviour! */
1466  if (!SDL_WasInit(SDL_INIT_AUDIO)) {
1467  if (SDL_InitSubSystem(SDL_INIT_AUDIO) < 0) {
1468  return -1;
1469  }
1470  }
1471 
1472  /* SDL_OpenAudio() is legacy and can only act on Device ID #1. */
1473  if (open_devices[0] != NULL) {
1474  SDL_SetError("Audio device is already opened");
1475  return -1;
1476  }
1477 
1478  if (obtained) {
1479  id = open_audio_device(NULL, 0, desired, obtained,
1481  } else {
1482  SDL_AudioSpec _obtained;
1483  SDL_zero(_obtained);
1484  id = open_audio_device(NULL, 0, desired, &_obtained, 0, 1);
1485  /* On successful open, copy calculated values into 'desired'. */
1486  if (id > 0) {
1487  desired->size = _obtained.size;
1488  desired->silence = _obtained.silence;
1489  }
1490  }
1491 
1492  SDL_assert((id == 0) || (id == 1));
1493  return (id == 0) ? -1 : 0;
1494 }
1495 
1497 SDL_OpenAudioDevice(const char *device, int iscapture,
1498  const SDL_AudioSpec * desired, SDL_AudioSpec * obtained,
1499  int allowed_changes)
1500 {
1501  return open_audio_device(device, iscapture, desired, obtained,
1502  allowed_changes, 2);
1503 }
1504 
1507 {
1510  if (device && SDL_AtomicGet(&device->enabled)) {
1511  if (SDL_AtomicGet(&device->paused)) {
1512  status = SDL_AUDIO_PAUSED;
1513  } else {
1514  status = SDL_AUDIO_PLAYING;
1515  }
1516  }
1517  return status;
1518 }
1519 
1520 
1523 {
1524  return SDL_GetAudioDeviceStatus(1);
1525 }
1526 
1527 void
1529 {
1531  if (device) {
1533  SDL_AtomicSet(&device->paused, pause_on ? 1 : 0);
1535  }
1536 }
1537 
1538 void
1539 SDL_PauseAudio(int pause_on)
1540 {
1541  SDL_PauseAudioDevice(1, pause_on);
1542 }
1543 
1544 
1545 void
1547 {
1548  /* Obtain a lock on the mixing buffers */
1550  if (device) {
1552  }
1553 }
1554 
1555 void
1557 {
1559 }
1560 
1561 void
1563 {
1564  /* Obtain a lock on the mixing buffers */
1566  if (device) {
1568  }
1569 }
1570 
1571 void
1573 {
1575 }
1576 
1577 void
1579 {
1581 }
1582 
1583 void
1585 {
1587 }
1588 
1589 void
1591 {
1593 
1594  if (!current_audio.name) { /* not initialized?! */
1595  return;
1596  }
1597 
1598  for (i = 0; i < SDL_arraysize(open_devices); i++) {
1600  }
1601 
1604 
1605  /* Free the driver data */
1607 
1609 
1612 
1613 #ifdef HAVE_LIBSAMPLERATE_H
1614  UnloadLibSampleRate();
1615 #endif
1616 
1618 }
1619 
1620 #define NUM_FORMATS 10
1621 static int format_idx;
1622 static int format_idx_sub;
1644 };
1645 
1648 {
1649  for (format_idx = 0; format_idx < NUM_FORMATS; ++format_idx) {
1650  if (format_list[format_idx][0] == format) {
1651  break;
1652  }
1653  }
1654  format_idx_sub = 0;
1655  return SDL_NextAudioFormat();
1656 }
1657 
1660 {
1661  if ((format_idx == NUM_FORMATS) || (format_idx_sub == NUM_FORMATS)) {
1662  return 0;
1663  }
1665 }
1666 
1667 void
1669 {
1670  switch (spec->format) {
1671  case AUDIO_U8:
1672  spec->silence = 0x80;
1673  break;
1674  default:
1675  spec->silence = 0x00;
1676  break;
1677  }
1679  spec->size *= spec->channels;
1680  spec->size *= spec->samples;
1681 }
1682 
1683 
1684 /*
1685  * Moved here from SDL_mixer.c, since it relies on internals of an opened
1686  * audio device (and is deprecated, by the way!).
1687  */
1688 void
1689 SDL_MixAudio(Uint8 * dst, const Uint8 * src, Uint32 len, int volume)
1690 {
1691  /* Mix the user-level audio format */
1693  if (device != NULL) {
1694  SDL_MixAudioFormat(dst, src, device->callbackspec.format, len, volume);
1695  }
1696 }
1697 
1698 /* vi: set ts=4 sw=4 expandtab: */
SDL.h
SDL_zero
#define SDL_zero(x)
Definition: SDL_stdinc.h:416
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static void finish_audio_entry_points_init(void)
Definition: SDL_audio.c:331
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Definition: SDL_audio.c:1621
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GLint GLint GLsizei GLsizei GLsizei GLint GLenum format
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Definition: SDL_opengl_glext.h:660
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Definition: SDL_audio.c:31
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Definition: SDL_audio.h:183
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Definition: SDL_audio.c:37
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A variable controlling speed/quality tradeoff of audio resampling.
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Definition: loopwave.c:31
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Definition: SDL_audio.c:232
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Definition: SDL_audio.h:93
i
return Display return Display Bool Bool int int int return Display XEvent Bool(*) XPointer return Display return Display Drawable _Xconst char unsigned int unsigned int return Display Pixmap Pixmap XColor XColor unsigned int unsigned int return Display _Xconst char char int char return Display Visual unsigned int int int char unsigned int unsigned int in i)
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Definition: SDL_audio.c:469
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static void close_audio_device(SDL_AudioDevice *device)
Definition: SDL_audio.c:1110
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#define SDL_WaitThread
Definition: SDL_dynapi_overrides.h:478
SDL_LIBSAMPLERATE_DYNAMIC
#define SDL_LIBSAMPLERATE_DYNAMIC
Definition: SDL_config.h:417
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static void SDL_AudioBeginLoopIteration_Default(_THIS)
Definition: SDL_audio.c:237
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static SDL_AudioDevice * open_devices[16]
Definition: SDL_audio.c:34
SDL_AudioFlushCapture_Default
static void SDL_AudioFlushCapture_Default(_THIS)
Definition: SDL_audio.c:264
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void SDL_MixAudio(Uint8 *dst, const Uint8 *src, Uint32 len, int volume)
Definition: SDL_audio.c:1689
CHECK_FMT_STRING
#define CHECK_FMT_STRING(x)
SDL_LockAudioDevice
void SDL_LockAudioDevice(SDL_AudioDeviceID devid)
Definition: SDL_audio.c:1546
Uint16
uint16_t Uint16
Definition: SDL_stdinc.h:191
SDL_AudioDevice
Definition: SDL_sysaudio.h:131
SDL_AudioDriver::detectionLock
SDL_mutex * detectionLock
Definition: SDL_sysaudio.h:120
SDL_AudioDriverImpl::Deinitialize
void(* Deinitialize)(void)
Definition: SDL_sysaudio.h:82
SDL_PauseAudioDevice
void SDL_PauseAudioDevice(SDL_AudioDeviceID devid, int pause_on)
Definition: SDL_audio.c:1528
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static SDL_AudioDevice * get_audio_device(SDL_AudioDeviceID id)
Definition: SDL_audio.c:200
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void SDL_UnlockAudio(void)
Definition: SDL_audio.c:1572
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#define SDL_INIT_AUDIO
Definition: SDL.h:78
SDL_FreeResampleFilter
void SDL_FreeResampleFilter(void)
Definition: SDL_audiocvt.c:464
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static SDL_INLINE SDL_bool is_in_audio_device_thread(SDL_AudioDevice *device)
Definition: SDL_audio.c:296
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int demand_only
Definition: SDL_sysaudio.h:181