This repository has been archived by the owner on Feb 11, 2021. It is now read-only.
/
SDL_audio.c
986 lines (861 loc) · 26.7 KB
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
11
12
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13
Lesser General Public License for more details.
14
15
16
17
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18
19
Sam Lantinga
20
slouken@libsdl.org
21
*/
22
#include "SDL_config.h"
23
24
25
26
27
28
29
30
/* Allow access to a raw mixing buffer */
#include "SDL.h"
#include "SDL_audio_c.h"
#include "SDL_audiomem.h"
#include "SDL_sysaudio.h"
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
#define _THIS SDL_AudioDevice *this
static SDL_AudioDriver current_audio;
static SDL_AudioDevice *open_devices[16];
/* !!! FIXME: These are wordy and unlocalized... */
#define DEFAULT_OUTPUT_DEVNAME "System audio output device"
#define DEFAULT_INPUT_DEVNAME "System audio capture device"
/*
* Not all of these will be compiled and linked in, but it's convenient
* to have a complete list here and saves yet-another block of #ifdefs...
* Please see bootstrap[], below, for the actual #ifdef mess.
*/
extern AudioBootStrap BSD_AUDIO_bootstrap;
extern AudioBootStrap DSP_bootstrap;
extern AudioBootStrap DMA_bootstrap;
extern AudioBootStrap ALSA_bootstrap;
50
extern AudioBootStrap PULSEAUDIO_bootstrap;
51
52
53
54
55
56
57
extern AudioBootStrap QNXNTOAUDIO_bootstrap;
extern AudioBootStrap SUNAUDIO_bootstrap;
extern AudioBootStrap DMEDIA_bootstrap;
extern AudioBootStrap ARTS_bootstrap;
extern AudioBootStrap ESD_bootstrap;
extern AudioBootStrap NAS_bootstrap;
extern AudioBootStrap DSOUND_bootstrap;
58
extern AudioBootStrap WINWAVEOUT_bootstrap;
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
extern AudioBootStrap PAUDIO_bootstrap;
extern AudioBootStrap BEOSAUDIO_bootstrap;
extern AudioBootStrap COREAUDIO_bootstrap;
extern AudioBootStrap SNDMGR_bootstrap;
extern AudioBootStrap MINTAUDIO_GSXB_bootstrap;
extern AudioBootStrap MINTAUDIO_MCSN_bootstrap;
extern AudioBootStrap MINTAUDIO_STFA_bootstrap;
extern AudioBootStrap MINTAUDIO_XBIOS_bootstrap;
extern AudioBootStrap MINTAUDIO_DMA8_bootstrap;
extern AudioBootStrap DISKAUD_bootstrap;
extern AudioBootStrap DUMMYAUD_bootstrap;
extern AudioBootStrap DCAUD_bootstrap;
extern AudioBootStrap MMEAUDIO_bootstrap;
extern AudioBootStrap DART_bootstrap;
74
75
76
/* Available audio drivers */
static AudioBootStrap *bootstrap[] = {
77
#if SDL_AUDIO_DRIVER_BSD
78
&BSD_AUDIO_bootstrap,
79
#endif
80
#if SDL_AUDIO_DRIVER_OSS
81
82
&DSP_bootstrap,
&DMA_bootstrap,
83
#endif
84
#if SDL_AUDIO_DRIVER_ALSA
85
&ALSA_bootstrap,
86
#endif
87
#if SDL_AUDIO_DRIVER_PULSEAUDIO
88
&PULSEAUDIO_bootstrap,
89
#endif
90
#if SDL_AUDIO_DRIVER_QNXNTO
91
&QNXNTOAUDIO_bootstrap,
92
#endif
93
#if SDL_AUDIO_DRIVER_SUNAUDIO
94
&SUNAUDIO_bootstrap,
95
#endif
96
#if SDL_AUDIO_DRIVER_DMEDIA
97
&DMEDIA_bootstrap,
98
#endif
99
#if SDL_AUDIO_DRIVER_ARTS
100
&ARTS_bootstrap,
101
#endif
102
#if SDL_AUDIO_DRIVER_ESD
103
&ESD_bootstrap,
104
#endif
105
#if SDL_AUDIO_DRIVER_NAS
106
&NAS_bootstrap,
107
#endif
108
#if SDL_AUDIO_DRIVER_DSOUND
109
&DSOUND_bootstrap,
110
#endif
111
112
#if SDL_AUDIO_DRIVER_WINWAVEOUT
&WINWAVEOUT_bootstrap,
113
#endif
114
115
#if SDL_AUDIO_DRIVER_PAUDIO
&PAUDIO_bootstrap,
116
#endif
117
118
#if SDL_AUDIO_DRIVER_BEOSAUDIO
&BEOSAUDIO_bootstrap,
119
#endif
120
#if SDL_AUDIO_DRIVER_COREAUDIO
121
&COREAUDIO_bootstrap,
122
#endif
123
#if SDL_AUDIO_DRIVER_SNDMGR
124
&SNDMGR_bootstrap,
125
#endif
126
#if SDL_AUDIO_DRIVER_MINT
127
128
129
130
131
&MINTAUDIO_GSXB_bootstrap,
&MINTAUDIO_MCSN_bootstrap,
&MINTAUDIO_STFA_bootstrap,
&MINTAUDIO_XBIOS_bootstrap,
&MINTAUDIO_DMA8_bootstrap,
132
#endif
133
#if SDL_AUDIO_DRIVER_DISK
134
&DISKAUD_bootstrap,
135
#endif
136
#if SDL_AUDIO_DRIVER_DUMMY
137
&DUMMYAUD_bootstrap,
138
#endif
139
#if SDL_AUDIO_DRIVER_DC
140
&DCAUD_bootstrap,
141
#endif
142
#if SDL_AUDIO_DRIVER_MMEAUDIO
143
&MMEAUDIO_bootstrap,
144
145
#endif
#if SDL_AUDIO_DRIVER_DART
146
&DART_bootstrap,
147
#endif
148
NULL
149
150
};
151
152
static SDL_AudioDevice *
get_audio_device(SDL_AudioDeviceID id)
153
154
{
id--;
155
if ((id >= SDL_arraysize(open_devices)) || (open_devices[id] == NULL)) {
156
157
158
159
160
161
162
163
164
SDL_SetError("Invalid audio device ID");
return NULL;
}
return open_devices[id];
}
/* stubs for audio drivers that don't need a specific entry point... */
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
static int
SDL_AudioDetectDevices_Default(int iscapture)
{
return -1;
}
static void
SDL_AudioThreadInit_Default(_THIS)
{ /* no-op. */
}
static void
SDL_AudioWaitDevice_Default(_THIS)
{ /* no-op. */
}
static void
SDL_AudioPlayDevice_Default(_THIS)
{ /* no-op. */
}
static Uint8 *
SDL_AudioGetDeviceBuf_Default(_THIS)
{
return NULL;
}
static void
SDL_AudioWaitDone_Default(_THIS)
{ /* no-op. */
}
static void
SDL_AudioCloseDevice_Default(_THIS)
{ /* no-op. */
}
static void
SDL_AudioDeinitialize_Default(void)
{ /* no-op. */
}
199
200
201
202
203
204
205
static int
SDL_AudioOpenDevice_Default(_THIS, const char *devname, int iscapture)
{
return 0;
}
206
207
static const char *
SDL_AudioGetDeviceName_Default(int index, int iscapture)
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
{
SDL_SetError("No such device");
return NULL;
}
static void
SDL_AudioLockDevice_Default(SDL_AudioDevice * device)
{
if (device->thread && (SDL_ThreadID() == device->threadid)) {
return;
}
SDL_mutexP(device->mixer_lock);
}
static void
SDL_AudioUnlockDevice_Default(SDL_AudioDevice * device)
{
if (device->thread && (SDL_ThreadID() == device->threadid)) {
return;
}
SDL_mutexV(device->mixer_lock);
}
232
233
static void
finalize_audio_entry_points(void)
234
235
236
237
238
239
{
/*
* Fill in stub functions for unused driver entry points. This lets us
* blindly call them without having to check for validity first.
*/
240
#define FILL_STUB(x) \
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
if (current_audio.impl.x == NULL) { \
current_audio.impl.x = SDL_Audio##x##_Default; \
}
FILL_STUB(DetectDevices);
FILL_STUB(GetDeviceName);
FILL_STUB(OpenDevice);
FILL_STUB(ThreadInit);
FILL_STUB(WaitDevice);
FILL_STUB(PlayDevice);
FILL_STUB(GetDeviceBuf);
FILL_STUB(WaitDone);
FILL_STUB(CloseDevice);
FILL_STUB(LockDevice);
FILL_STUB(UnlockDevice);
FILL_STUB(Deinitialize);
256
#undef FILL_STUB
257
}
258
259
260
/* The general mixing thread function */
261
int SDLCALL
262
SDL_RunAudio(void *devicep)
263
{
264
SDL_AudioDevice *device = (SDL_AudioDevice *) devicep;
265
266
267
268
269
Uint8 *stream;
int stream_len;
void *udata;
void (SDLCALL * fill) (void *userdata, Uint8 * stream, int len);
int silence;
270
271
/* Perform any thread setup */
272
273
device->threadid = SDL_ThreadID();
current_audio.impl.ThreadInit(device);
274
275
/* Set up the mixing function */
276
277
fill = device->spec.callback;
udata = device->spec.userdata;
278
279
280
if (device->convert.needed) {
if (device->convert.src_format == AUDIO_U8) {
281
282
283
284
silence = 0x80;
} else {
silence = 0;
}
285
stream_len = device->convert.len;
286
} else {
287
288
silence = device->spec.silence;
stream_len = device->spec.size;
289
}
290
291
/* Loop, filling the audio buffers */
292
while (device->enabled) {
293
294
/* Fill the current buffer with sound */
295
296
297
if (device->convert.needed) {
if (device->convert.buf) {
stream = device->convert.buf;
298
299
300
301
} else {
continue;
}
} else {
302
stream = current_audio.impl.GetDeviceBuf(device);
303
if (stream == NULL) {
304
stream = device->fake_stream;
305
}
306
}
307
308
309
if (!device->paused) {
SDL_mutexP(device->mixer_lock);
310
(*fill) (udata, stream, stream_len);
311
SDL_mutexV(device->mixer_lock);
312
}
313
314
/* Convert the audio if necessary */
315
316
317
if (device->convert.needed) {
SDL_ConvertAudio(&device->convert);
stream = current_audio.impl.GetDeviceBuf(device);
318
if (stream == NULL) {
319
stream = device->fake_stream;
320
}
321
SDL_memcpy(stream, device->convert.buf, device->convert.len_cvt);
322
323
324
}
/* Ready current buffer for play and change current buffer */
325
326
if (stream != device->fake_stream) {
current_audio.impl.PlayDevice(device);
327
328
329
}
/* Wait for an audio buffer to become available */
330
331
if (stream == device->fake_stream) {
SDL_Delay((device->spec.samples * 1000) / device->spec.freq);
332
} else {
333
current_audio.impl.WaitDevice(device);
334
335
336
337
}
}
/* Wait for the audio to drain.. */
338
current_audio.impl.WaitDone(device);
339
340
return (0);
341
342
}
343
344
static SDL_AudioFormat
345
SDL_ParseAudioFormat(const char *string)
346
{
347
#define CHECK_FMT_STRING(x) if (SDL_strcmp(string, #x) == 0) return AUDIO_##x
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
CHECK_FMT_STRING(U8);
CHECK_FMT_STRING(S8);
CHECK_FMT_STRING(U16LSB);
CHECK_FMT_STRING(S16LSB);
CHECK_FMT_STRING(U16MSB);
CHECK_FMT_STRING(S16MSB);
CHECK_FMT_STRING(U16SYS);
CHECK_FMT_STRING(S16SYS);
CHECK_FMT_STRING(U16);
CHECK_FMT_STRING(S16);
CHECK_FMT_STRING(S32LSB);
CHECK_FMT_STRING(S32MSB);
CHECK_FMT_STRING(S32SYS);
CHECK_FMT_STRING(S32);
CHECK_FMT_STRING(F32LSB);
CHECK_FMT_STRING(F32MSB);
CHECK_FMT_STRING(F32SYS);
CHECK_FMT_STRING(F32);
366
#undef CHECK_FMT_STRING
367
return 0;
368
369
}
370
371
int
SDL_GetNumAudioDrivers(void)
372
{
373
374
return (SDL_arraysize(bootstrap) - 1);
}
375
376
377
378
379
380
381
382
383
384
385
386
387
const char *
SDL_GetAudioDriver(int index)
{
if (index >= 0 && index < SDL_GetNumAudioDrivers()) {
return (bootstrap[index]->name);
}
return (NULL);
}
int
SDL_AudioInit(const char *driver_name)
{
388
389
390
int i = 0;
int initialized = 0;
int tried_to_init = 0;
391
392
if (SDL_WasInit(SDL_INIT_AUDIO)) {
393
SDL_AudioQuit(); /* shutdown driver if already running. */
394
395
}
396
397
SDL_memset(¤t_audio, '\0', sizeof(current_audio));
SDL_memset(open_devices, '\0', sizeof(open_devices));
398
399
/* Select the proper audio driver */
400
401
402
if (driver_name == NULL) {
driver_name = SDL_getenv("SDL_AUDIODRIVER");
}
403
404
405
406
for (i = 0; (!initialized) && (bootstrap[i]); ++i) {
/* make sure we should even try this driver before doing so... */
const AudioBootStrap *backend = bootstrap[i];
407
408
if (((driver_name) && (SDL_strcasecmp(backend->name, driver_name))) ||
((!driver_name) && (backend->demand_only))) {
409
continue;
410
}
411
412
tried_to_init = 1;
413
SDL_memset(¤t_audio, 0, sizeof(current_audio));
414
415
416
current_audio.name = backend->name;
current_audio.desc = backend->desc;
initialized = backend->init(¤t_audio.impl);
417
}
418
419
420
421
if (!initialized) {
/* specific drivers will set the error message if they fail... */
if (!tried_to_init) {
422
423
424
425
426
427
if (driver_name) {
SDL_SetError("%s not available", driver_name);
} else {
SDL_SetError("No available audio device");
}
}
428
429
430
SDL_memset(¤t_audio, 0, sizeof(current_audio));
return (-1); /* No driver was available, so fail. */
431
}
432
433
434
finalize_audio_entry_points();
435
return (0);
436
437
}
438
439
440
441
442
/*
* Get the current audio driver name
*/
const char *
SDL_GetCurrentAudioDriver()
443
{
444
return current_audio.name;
445
446
}
447
448
int
449
SDL_GetNumAudioDevices(int iscapture)
450
{
451
452
453
454
455
456
if (!SDL_WasInit(SDL_INIT_AUDIO)) {
return -1;
}
if ((iscapture) && (!current_audio.impl.HasCaptureSupport)) {
return 0;
}
457
458
459
if ((iscapture) && (current_audio.impl.OnlyHasDefaultInputDevice)) {
return 1;
460
461
}
462
463
if ((!iscapture) && (current_audio.impl.OnlyHasDefaultOutputDevice)) {
return 1;
464
465
}
466
467
468
469
470
471
472
473
474
475
return current_audio.impl.DetectDevices(iscapture);
}
const char *
SDL_GetAudioDeviceName(int index, int iscapture)
{
if (!SDL_WasInit(SDL_INIT_AUDIO)) {
SDL_SetError("Audio subsystem is not initialized");
return NULL;
476
}
477
478
479
480
if ((iscapture) && (!current_audio.impl.HasCaptureSupport)) {
SDL_SetError("No capture support");
return NULL;
481
}
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
if (index < 0) {
SDL_SetError("No such device");
return NULL;
}
if ((iscapture) && (current_audio.impl.OnlyHasDefaultInputDevice)) {
return DEFAULT_INPUT_DEVNAME;
}
if ((!iscapture) && (current_audio.impl.OnlyHasDefaultOutputDevice)) {
return DEFAULT_OUTPUT_DEVNAME;
}
return current_audio.impl.GetDeviceName(index, iscapture);
}
static void
501
close_audio_device(SDL_AudioDevice * device)
502
503
504
505
506
507
508
{
device->enabled = 0;
if (device->thread != NULL) {
SDL_WaitThread(device->thread, NULL);
}
if (device->mixer_lock != NULL) {
SDL_DestroyMutex(device->mixer_lock);
509
}
510
511
if (device->fake_stream != NULL) {
SDL_FreeAudioMem(device->fake_stream);
512
}
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
if (device->convert.needed) {
SDL_FreeAudioMem(device->convert.buf);
}
if (device->opened) {
current_audio.impl.CloseDevice(device);
device->opened = 0;
}
SDL_FreeAudioMem(device);
}
/*
* Sanity check desired AudioSpec for SDL_OpenAudio() in (orig).
* Fills in a sanitized copy in (prepared).
* Returns non-zero if okay, zero on fatal parameters in (orig).
*/
static int
530
prepare_audiospec(const SDL_AudioSpec * orig, SDL_AudioSpec * prepared)
531
{
532
SDL_memcpy(prepared, orig, sizeof(SDL_AudioSpec));
533
534
535
536
537
538
539
540
if (orig->callback == NULL) {
SDL_SetError("SDL_OpenAudio() passed a NULL callback");
return 0;
}
if (orig->freq == 0) {
const char *env = SDL_getenv("SDL_AUDIO_FREQUENCY");
541
542
if ((!env) || ((prepared->freq = SDL_atoi(env)) == 0)) {
prepared->freq = 22050; /* a reasonable default */
543
544
}
}
545
546
547
548
if (orig->format == 0) {
const char *env = SDL_getenv("SDL_AUDIO_FORMAT");
if ((!env) || ((prepared->format = SDL_ParseAudioFormat(env)) == 0)) {
549
prepared->format = AUDIO_S16; /* a reasonable default */
550
551
552
553
}
}
switch (orig->channels) {
554
555
case 0:{
const char *env = SDL_getenv("SDL_AUDIO_CHANNELS");
556
if ((!env) || ((prepared->channels = (Uint8) SDL_atoi(env)) == 0)) {
557
558
559
prepared->channels = 2; /* a reasonable default */
}
break;
560
}
561
562
563
564
565
566
case 1: /* Mono */
case 2: /* Stereo */
case 4: /* surround */
case 6: /* surround with center and lfe */
break;
default:
567
568
SDL_SetError("Unsupported number of audio channels.");
return 0;
569
}
570
571
572
if (orig->samples == 0) {
const char *env = SDL_getenv("SDL_AUDIO_SAMPLES");
573
if ((!env) || ((prepared->samples = (Uint16) SDL_atoi(env)) == 0)) {
574
575
576
577
578
579
580
581
/* Pick a default of ~46 ms at desired frequency */
/* !!! FIXME: remove this when the non-Po2 resampling is in. */
const int samples = (prepared->freq / 1000) * 46;
int power2 = 1;
while (power2 < samples) {
power2 *= 2;
}
prepared->samples = power2;
582
583
}
}
584
585
586
587
588
589
590
591
592
593
/* Calculate the silence and size of the audio specification */
SDL_CalculateAudioSpec(prepared);
return 1;
}
static SDL_AudioDeviceID
open_audio_device(const char *devname, int iscapture,
594
595
const SDL_AudioSpec * _desired, SDL_AudioSpec * obtained,
int min_id)
596
597
598
599
600
601
602
603
604
{
SDL_AudioDeviceID id = 0;
SDL_AudioSpec desired;
SDL_AudioDevice *device;
int i = 0;
if (!SDL_WasInit(SDL_INIT_AUDIO)) {
SDL_SetError("Audio subsystem is not initialized");
return 0;
605
}
606
607
608
609
if ((iscapture) && (!current_audio.impl.HasCaptureSupport)) {
SDL_SetError("No capture support");
return 0;
610
}
611
612
613
614
if (!prepare_audiospec(_desired, &desired)) {
return 0;
}
615
616
617
618
619
/* If app doesn't care about a specific device, let the user override. */
if (devname == NULL) {
devname = SDL_getenv("SDL_AUDIO_DEVICE_NAME");
}
620
621
622
623
624
625
626
627
628
629
/*
* Catch device names at the high level for the simple case...
* This lets us have a basic "device enumeration" for systems that
* don't have multiple devices, but makes sure the device name is
* always NULL when it hits the low level.
*
* Also make sure that the simple case prevents multiple simultaneous
* opens of the default system device.
*/
630
631
632
633
634
635
636
if ((iscapture) && (current_audio.impl.OnlyHasDefaultInputDevice)) {
if ((devname) && (SDL_strcmp(devname, DEFAULT_INPUT_DEVNAME) != 0)) {
SDL_SetError("No such device");
return 0;
}
devname = NULL;
637
638
639
640
641
642
643
for (i = 0; i < SDL_arraysize(open_devices); i++) {
if ((open_devices[i]) && (open_devices[i]->iscapture)) {
SDL_SetError("Audio device already open");
return 0;
}
}
644
645
}
646
647
648
649
650
651
if ((!iscapture) && (current_audio.impl.OnlyHasDefaultOutputDevice)) {
if ((devname) && (SDL_strcmp(devname, DEFAULT_OUTPUT_DEVNAME) != 0)) {
SDL_SetError("No such device");
return 0;
}
devname = NULL;
652
653
654
655
656
657
658
659
for (i = 0; i < SDL_arraysize(open_devices); i++) {
if ((open_devices[i]) && (!open_devices[i]->iscapture)) {
SDL_SetError("Audio device already open");
return 0;
}
}
}
660
661
device = (SDL_AudioDevice *) SDL_AllocAudioMem(sizeof(SDL_AudioDevice));
662
663
664
if (device == NULL) {
SDL_OutOfMemory();
return 0;
665
}
666
667
SDL_memset(device, '\0', sizeof(SDL_AudioDevice));
SDL_memcpy(&device->spec, &desired, sizeof(SDL_AudioSpec));
668
669
670
device->enabled = 1;
device->paused = 1;
device->iscapture = iscapture;
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
/* Create a semaphore for locking the sound buffers */
if (!current_audio.impl.SkipMixerLock) {
device->mixer_lock = SDL_CreateMutex();
if (device->mixer_lock == NULL) {
close_audio_device(device);
SDL_SetError("Couldn't create mixer lock");
return 0;
}
}
if (!current_audio.impl.OpenDevice(device, devname, iscapture)) {
close_audio_device(device);
return 0;
}
device->opened = 1;
687
688
/* If the audio driver changes the buffer size, accept it */
689
690
691
if (device->spec.samples != desired.samples) {
desired.samples = device->spec.samples;
SDL_CalculateAudioSpec(&device->spec);
692
693
694
}
/* Allocate a fake audio memory buffer */
695
696
697
device->fake_stream = SDL_AllocAudioMem(device->spec.size);
if (device->fake_stream == NULL) {
close_audio_device(device);
698
SDL_OutOfMemory();
699
return 0;
700
701
702
703
}
/* See if we need to do any conversion */
if (obtained != NULL) {
704
705
706
707
SDL_memcpy(obtained, &device->spec, sizeof(SDL_AudioSpec));
} else if (desired.freq != device->spec.freq ||
desired.format != device->spec.format ||
desired.channels != device->spec.channels) {
708
/* Build an audio conversion block */
709
710
711
712
713
714
715
if (SDL_BuildAudioCVT(&device->convert,
desired.format, desired.channels,
desired.freq,
device->spec.format, device->spec.channels,
device->spec.freq) < 0) {
close_audio_device(device);
return 0;
716
}
717
if (device->convert.needed) {
718
719
device->convert.len = (int) (((double) desired.size) /
device->convert.len_ratio);
720
721
722
723
724
725
device->convert.buf =
(Uint8 *) SDL_AllocAudioMem(device->convert.len *
device->convert.len_mult);
if (device->convert.buf == NULL) {
close_audio_device(device);
726
SDL_OutOfMemory();
727
return 0;
728
729
730
}
}
}
731
732
/* Find an available device ID and store the structure... */
733
for (id = min_id - 1; id < SDL_arraysize(open_devices); id++) {
734
735
736
737
738
739
740
741
742
743
744
745
if (open_devices[id] == NULL) {
open_devices[id] = device;
break;
}
}
if (id == SDL_arraysize(open_devices)) {
SDL_SetError("Too many open audio devices");
close_audio_device(device);
return 0;
}
746
/* Start the audio thread if necessary */
747
if (!current_audio.impl.ProvidesOwnCallbackThread) {
748
/* Start the audio thread */
749
/* !!! FIXME: this is nasty. */
750
#if (defined(__WIN32__) && !defined(_WIN32_WCE)) && !defined(HAVE_LIBC)
751
#undef SDL_CreateThread
752
device->thread = SDL_CreateThread(SDL_RunAudio, device, NULL, NULL);
753
#else
754
device->thread = SDL_CreateThread(SDL_RunAudio, device);
755
#endif
756
if (device->thread == NULL) {
757
SDL_CloseAudioDevice(id + 1);
758
SDL_SetError("Couldn't create audio thread");
759
760
761
762
return 0;
}
}
763
return id + 1;
764
765
766
767
768
769
770
771
772
773
774
}
int
SDL_OpenAudio(const SDL_AudioSpec * desired, SDL_AudioSpec * obtained)
{
SDL_AudioDeviceID id = 0;
/* Start up the audio driver, if necessary. This is legacy behaviour! */
if (!SDL_WasInit(SDL_INIT_AUDIO)) {
if (SDL_InitSubSystem(SDL_INIT_AUDIO) < 0) {
775
776
return (-1);
}
777
}
778
779
780
781
782
/* SDL_OpenAudio() is legacy and can only act on Device ID #1. */
if (open_devices[0] != NULL) {
SDL_SetError("Audio device is already opened");
return (-1);
783
}
784
785
id = open_audio_device(NULL, 0, desired, obtained, 1);
786
if (id > 1) { /* this should never happen in theory... */
787
SDL_CloseAudioDevice(id);
788
SDL_SetError("Internal error"); /* MUST be Device ID #1! */
789
790
return (-1);
}
791
792
return ((id == 0) ? -1 : 0);
793
794
}
795
796
SDL_AudioDeviceID
SDL_OpenAudioDevice(const char *device, int iscapture,
797
const SDL_AudioSpec * desired, SDL_AudioSpec * obtained)
798
{
799
800
return open_audio_device(device, iscapture, desired, obtained, 2);
}
801
802
803
804
805
806
807
808
SDL_audiostatus
SDL_GetAudioDeviceStatus(SDL_AudioDeviceID devid)
{
SDL_AudioDevice *device = get_audio_device(devid);
SDL_audiostatus status = SDL_AUDIO_STOPPED;
if (device && device->enabled) {
if (device->paused) {
809
810
811
812
813
814
status = SDL_AUDIO_PAUSED;
} else {
status = SDL_AUDIO_PLAYING;
}
}
return (status);
815
816
}
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
SDL_audiostatus
SDL_GetAudioStatus(void)
{
return SDL_GetAudioDeviceStatus(1);
}
void
SDL_PauseAudioDevice(SDL_AudioDeviceID devid, int pause_on)
{
SDL_AudioDevice *device = get_audio_device(devid);
if (device) {
device->paused = pause_on;
}
}
833
834
void
SDL_PauseAudio(int pause_on)
835
{
836
837
838
SDL_PauseAudioDevice(1, pause_on);
}
839
840
841
842
843
844
845
846
void
SDL_LockAudioDevice(SDL_AudioDeviceID devid)
{
/* Obtain a lock on the mixing buffers */
SDL_AudioDevice *device = get_audio_device(devid);
if (device) {
current_audio.impl.LockDevice(device);
847
}
848
849
}
850
851
void
SDL_LockAudio(void)
852
{
853
854
SDL_LockAudioDevice(1);
}
855
856
857
858
void
SDL_UnlockAudioDevice(SDL_AudioDeviceID devid)
{
859
/* Obtain a lock on the mixing buffers */
860
861
862
SDL_AudioDevice *device = get_audio_device(devid);
if (device) {
current_audio.impl.UnlockDevice(device);
863
}
864
865
}
866
867
void
SDL_UnlockAudio(void)
868
{
869
870
SDL_UnlockAudioDevice(1);
}
871
872
873
874
875
876
877
void
SDL_CloseAudioDevice(SDL_AudioDeviceID devid)
{
SDL_AudioDevice *device = get_audio_device(devid);
if (device) {
close_audio_device(device);
878
open_devices[devid - 1] = NULL;
879
}
880
881
}
882
883
void
SDL_CloseAudio(void)
884
{
885
SDL_CloseAudioDevice(1);
886
887
}
888
889
void
SDL_AudioQuit(void)
890
{
891
892
893
SDL_AudioDeviceID i;
for (i = 0; i < SDL_arraysize(open_devices); i++) {
SDL_CloseAudioDevice(i);
894
}
895
896
897
/* Free the driver data */
current_audio.impl.Deinitialize();
898
899
SDL_memset(¤t_audio, '\0', sizeof(current_audio));
SDL_memset(open_devices, '\0', sizeof(open_devices));
900
901
}
902
#define NUM_FORMATS 10
903
904
static int format_idx;
static int format_idx_sub;
905
static SDL_AudioFormat format_list[NUM_FORMATS][NUM_FORMATS] = {
906
{AUDIO_U8, AUDIO_S8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB,
907
AUDIO_U16MSB, AUDIO_S32LSB, AUDIO_S32MSB, AUDIO_F32LSB, AUDIO_F32MSB},
908
{AUDIO_S8, AUDIO_U8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB,
909
910
911
912
913
914
915
916
917
AUDIO_U16MSB, AUDIO_S32LSB, AUDIO_S32MSB, AUDIO_F32LSB, AUDIO_F32MSB},
{AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_S32LSB,
AUDIO_S32MSB, AUDIO_F32LSB, AUDIO_F32MSB, AUDIO_U8, AUDIO_S8},
{AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_S32MSB,
AUDIO_S32LSB, AUDIO_F32MSB, AUDIO_F32LSB, AUDIO_U8, AUDIO_S8},
{AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_S32LSB,
AUDIO_S32MSB, AUDIO_F32LSB, AUDIO_F32MSB, AUDIO_U8, AUDIO_S8},
{AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_S32MSB,
AUDIO_S32LSB, AUDIO_F32MSB, AUDIO_F32LSB, AUDIO_U8, AUDIO_S8},
918
919
920
921
922
923
924
925
{AUDIO_S32LSB, AUDIO_S32MSB, AUDIO_F32LSB, AUDIO_F32MSB, AUDIO_S16LSB,
AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_U8, AUDIO_S8},
{AUDIO_S32MSB, AUDIO_S32LSB, AUDIO_F32MSB, AUDIO_F32LSB, AUDIO_S16MSB,
AUDIO_S16LSB, AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_U8, AUDIO_S8},
{AUDIO_F32LSB, AUDIO_F32MSB, AUDIO_S32LSB, AUDIO_S32MSB, AUDIO_S16LSB,
AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_U8, AUDIO_S8},
{AUDIO_F32MSB, AUDIO_F32LSB, AUDIO_S32MSB, AUDIO_S32LSB, AUDIO_S16MSB,
AUDIO_S16LSB, AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_U8, AUDIO_S8},
926
927
};
928
929
SDL_AudioFormat
SDL_FirstAudioFormat(SDL_AudioFormat format)
930
{
931
932
933
934
935
936
937
for (format_idx = 0; format_idx < NUM_FORMATS; ++format_idx) {
if (format_list[format_idx][0] == format) {
break;
}
}
format_idx_sub = 0;
return (SDL_NextAudioFormat());
938
939
}
940
SDL_AudioFormat
941
SDL_NextAudioFormat(void)
942
{
943
944
945
946
if ((format_idx == NUM_FORMATS) || (format_idx_sub == NUM_FORMATS)) {
return (0);
}
return (format_list[format_idx][format_idx_sub++]);
947
948
}
949
950
void
SDL_CalculateAudioSpec(SDL_AudioSpec * spec)
951
{
952
953
954
955
956
957
958
959
switch (spec->format) {
case AUDIO_U8:
spec->silence = 0x80;
break;
default:
spec->silence = 0x00;
break;
}
960
spec->size = SDL_AUDIO_BITSIZE(spec->format) / 8;
961
962
spec->size *= spec->channels;
spec->size *= spec->samples;
963
}
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
/*
* Moved here from SDL_mixer.c, since it relies on internals of an opened
* audio device (and is deprecated, by the way!).
*/
void
SDL_MixAudio(Uint8 * dst, const Uint8 * src, Uint32 len, int volume)
{
/* Mix the user-level audio format */
SDL_AudioDevice *device = get_audio_device(1);
if (device != NULL) {
SDL_AudioFormat format;
if (device->convert.needed) {
format = device->convert.src_format;
} else {
format = device->spec.format;
}
SDL_MixAudioFormat(dst, src, format, len, volume);
}
}
986
/* vi: set ts=4 sw=4 expandtab: */