/
SDL_audio.c
681 lines (606 loc) · 15.9 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
#ifdef __OS2__
32
/* We'll need the DosSetPriority() API! */
33
34
35
36
#define INCL_DOSPROCESS
#include <os2.h>
#endif
37
38
/* Available audio drivers */
static AudioBootStrap *bootstrap[] = {
39
#if SDL_AUDIO_DRIVER_OPENBSD
40
&OPENBSD_AUDIO_bootstrap,
41
#endif
42
#if SDL_AUDIO_DRIVER_OSS
43
44
45
&DSP_bootstrap,
&DMA_bootstrap,
#endif
46
#if SDL_AUDIO_DRIVER_ALSA
47
48
&ALSA_bootstrap,
#endif
49
#if SDL_AUDIO_DRIVER_QNXNTO
50
51
&QNXNTOAUDIO_bootstrap,
#endif
52
#if SDL_AUDIO_DRIVER_SUNAUDIO
53
54
&SUNAUDIO_bootstrap,
#endif
55
#if SDL_AUDIO_DRIVER_DMEDIA
56
&DMEDIA_bootstrap,
57
#endif
58
59
#if SDL_AUDIO_DRIVER_ARTS
&ARTS_bootstrap,
60
#endif
61
#if SDL_AUDIO_DRIVER_ESD
62
63
&ESD_bootstrap,
#endif
64
#if SDL_AUDIO_DRIVER_NAS
65
66
&NAS_bootstrap,
#endif
67
#if SDL_AUDIO_DRIVER_DSOUND
68
69
&DSOUND_bootstrap,
#endif
70
#if SDL_AUDIO_DRIVER_WAVEOUT
71
72
&WAVEOUT_bootstrap,
#endif
73
74
75
76
#if SDL_AUDIO_DRIVER_PAUD
&Paud_bootstrap,
#endif
#if SDL_AUDIO_DRIVER_BAUDIO
77
78
&BAUDIO_bootstrap,
#endif
79
#if SDL_AUDIO_DRIVER_COREAUDIO
80
81
&COREAUDIO_bootstrap,
#endif
82
#if SDL_AUDIO_DRIVER_SNDMGR
83
84
&SNDMGR_bootstrap,
#endif
85
#if SDL_AUDIO_DRIVER_AHI
86
87
&AHI_bootstrap,
#endif
88
#if SDL_AUDIO_DRIVER_MINT
89
90
91
92
93
&MINTAUDIO_GSXB_bootstrap,
&MINTAUDIO_MCSN_bootstrap,
&MINTAUDIO_STFA_bootstrap,
&MINTAUDIO_XBIOS_bootstrap,
&MINTAUDIO_DMA8_bootstrap,
94
#endif
95
#if SDL_AUDIO_DRIVER_DISK
96
&DISKAUD_bootstrap,
97
#endif
98
99
100
#if SDL_AUDIO_DRIVER_DUMMY
&DUMMYAUD_bootstrap,
#endif
101
#if SDL_AUDIO_DRIVER_DC
102
&DCAUD_bootstrap,
103
#endif
104
105
106
107
108
#if SDL_AUDIO_DRIVER_MMEAUDIO
&MMEAUDIO_bootstrap,
#endif
#if SDL_AUDIO_DRIVER_DART
&DART_bootstrap,
109
#endif
110
111
112
113
114
115
116
117
NULL
};
SDL_AudioDevice *current_audio = NULL;
/* Various local functions */
int SDL_AudioInit(const char *driver_name);
void SDL_AudioQuit(void);
118
#if SDL_AUDIO_DRIVER_AHI
119
120
static int audio_configured = 0;
#endif
121
122
123
124
125
126
127
128
129
130
/* The general mixing thread function */
int SDL_RunAudio(void *audiop)
{
SDL_AudioDevice *audio = (SDL_AudioDevice *)audiop;
Uint8 *stream;
int stream_len;
void *udata;
void (*fill)(void *userdata,Uint8 *stream, int len);
int silence;
131
#if SDL_AUDIO_DRIVER_AHI
132
133
134
135
136
137
138
139
140
141
142
143
144
145
int started = 0;
/* AmigaOS NEEDS that the audio driver is opened in the thread that uses it! */
D(bug("Task audio started audio struct:<%lx>...\n",audiop));
D(bug("Before Openaudio..."));
if(audio->OpenAudio(audio, &audio->spec)==-1)
{
D(bug("Open audio failed...\n"));
return(-1);
}
D(bug("OpenAudio...OK\n"));
#endif
146
147
148
149
150
151
152
153
154
155
/* Perform any thread setup */
if ( audio->ThreadInit ) {
audio->ThreadInit(audio);
}
audio->threadid = SDL_ThreadID();
/* Set up the mixing function */
fill = audio->spec.callback;
udata = audio->spec.userdata;
156
157
#if SDL_AUDIO_DRIVER_AHI
158
159
160
161
162
163
164
audio_configured = 1;
D(bug("Audio configured... Checking for conversion\n"));
SDL_mutexP(audio->mixer_lock);
D(bug("Semaphore obtained...\n"));
#endif
165
166
167
168
169
170
171
172
173
174
175
if ( audio->convert.needed ) {
if ( audio->convert.src_format == AUDIO_U8 ) {
silence = 0x80;
} else {
silence = 0;
}
stream_len = audio->convert.len;
} else {
silence = audio->spec.silence;
stream_len = audio->spec.size;
}
176
177
178
179
180
stream = audio->GetAudioBuf(audio);
if ( stream == NULL ) {
stream = audio->fake_stream;
}
181
182
#if SDL_AUDIO_DRIVER_AHI
183
184
185
186
SDL_mutexV(audio->mixer_lock);
D(bug("Entering audio loop...\n"));
#endif
187
#ifdef __OS2__
188
189
/* Increase the priority of this thread to make sure that
the audio will be continuous all the time! */
190
#ifdef USE_DOSSETPRIORITY
191
192
if (SDL_getenv("SDL_USE_TIMECRITICAL_AUDIO"))
{
193
#ifdef DEBUG_BUILD
194
printf("[SDL_RunAudio] : Setting priority to TimeCritical+0! (TID%d)\n", SDL_ThreadID());
195
#endif
196
197
198
199
200
201
202
203
204
DosSetPriority(PRTYS_THREAD, PRTYC_TIMECRITICAL, 0, 0);
}
else
{
#ifdef DEBUG_BUILD
printf("[SDL_RunAudio] : Setting priority to ForegroundServer+0! (TID%d)\n", SDL_ThreadID());
#endif
DosSetPriority(PRTYS_THREAD, PRTYC_FOREGROUNDSERVER, 0, 0);
}
205
206
#endif
#endif
207
208
209
210
211
212
213
214
/* Loop, filling the audio buffers */
while ( audio->enabled ) {
/* Wait for new current buffer to finish playing */
if ( stream == audio->fake_stream ) {
SDL_Delay((audio->spec.samples*1000)/audio->spec.freq);
} else {
215
#if SDL_AUDIO_DRIVER_AHI
216
217
if ( started > 1 )
#endif
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
audio->WaitAudio(audio);
}
/* Fill the current buffer with sound */
if ( audio->convert.needed ) {
if ( audio->convert.buf ) {
stream = audio->convert.buf;
} else {
continue;
}
} else {
stream = audio->GetAudioBuf(audio);
if ( stream == NULL ) {
stream = audio->fake_stream;
}
}
234
SDL_memset(stream, silence, stream_len);
235
236
237
238
239
240
241
242
243
244
245
246
247
248
if ( ! audio->paused ) {
SDL_mutexP(audio->mixer_lock);
(*fill)(udata, stream, stream_len);
SDL_mutexV(audio->mixer_lock);
}
/* Convert the audio if necessary */
if ( audio->convert.needed ) {
SDL_ConvertAudio(&audio->convert);
stream = audio->GetAudioBuf(audio);
if ( stream == NULL ) {
stream = audio->fake_stream;
}
249
SDL_memcpy(stream, audio->convert.buf,
250
251
252
253
254
255
audio->convert.len_cvt);
}
/* Ready current buffer for play and change current buffer */
if ( stream != audio->fake_stream ) {
audio->PlayAudio(audio);
256
#if SDL_AUDIO_DRIVER_AHI
257
258
259
/* AmigaOS don't have to wait the first time audio is played! */
started++;
#endif
260
261
262
263
264
265
}
}
/* Wait for the audio to drain.. */
if ( audio->WaitDone ) {
audio->WaitDone(audio);
}
266
267
#if SDL_AUDIO_DRIVER_AHI
268
269
270
271
272
273
D(bug("WaitAudio...Done\n"));
audio->CloseAudio(audio);
D(bug("CloseAudio..Done, subtask exiting...\n"));
audio_configured = 0;
274
275
276
277
278
#endif
#ifdef __OS2__
#ifdef DEBUG_BUILD
printf("[SDL_RunAudio] : Task exiting. (TID%d)\n", SDL_ThreadID());
#endif
279
#endif
280
281
282
return(0);
}
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
static void SDL_LockAudio_Default(SDL_AudioDevice *audio)
{
if ( audio->thread && (SDL_ThreadID() == audio->threadid) ) {
return;
}
SDL_mutexP(audio->mixer_lock);
}
static void SDL_UnlockAudio_Default(SDL_AudioDevice *audio)
{
if ( audio->thread && (SDL_ThreadID() == audio->threadid) ) {
return;
}
SDL_mutexV(audio->mixer_lock);
}
299
300
301
302
303
304
305
306
307
308
309
310
311
int SDL_AudioInit(const char *driver_name)
{
SDL_AudioDevice *audio;
int i = 0, idx;
/* Check to make sure we don't overwrite 'current_audio' */
if ( current_audio != NULL ) {
SDL_AudioQuit();
}
/* Select the proper audio driver */
audio = NULL;
idx = 0;
312
#if SDL_AUDIO_DRIVER_ESD
313
if ( (driver_name == NULL) && (SDL_getenv("ESPEAKER") != NULL) ) {
314
315
316
317
318
/* Ahem, we know that if ESPEAKER is set, user probably wants
to use ESD, but don't start it if it's not already running.
This probably isn't the place to do this, but... Shh! :)
*/
for ( i=0; bootstrap[i]; ++i ) {
319
if ( SDL_strcmp(bootstrap[i]->name, "esd") == 0 ) {
320
#ifdef HAVE_PUTENV
321
322
323
const char *esd_no_spawn;
/* Don't start ESD if it's not running */
324
esd_no_spawn = getenv("ESD_NO_SPAWN");
325
326
327
if ( esd_no_spawn == NULL ) {
putenv("ESD_NO_SPAWN=1");
}
328
#endif
329
330
331
332
if ( bootstrap[i]->available() ) {
audio = bootstrap[i]->create(0);
break;
}
333
#ifdef HAVE_UNSETENV
334
335
336
337
338
339
340
if ( esd_no_spawn == NULL ) {
unsetenv("ESD_NO_SPAWN");
}
#endif
}
}
}
341
#endif /* SDL_AUDIO_DRIVER_ESD */
342
343
344
if ( audio == NULL ) {
if ( driver_name != NULL ) {
#if 0 /* This will be replaced with a better driver selection API */
345
346
if ( SDL_strrchr(driver_name, ':') != NULL ) {
idx = atoi(SDL_strrchr(driver_name, ':')+1);
347
348
349
}
#endif
for ( i=0; bootstrap[i]; ++i ) {
350
351
if (SDL_strncmp(bootstrap[i]->name, driver_name,
SDL_strlen(bootstrap[i]->name)) == 0) {
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
if ( bootstrap[i]->available() ) {
audio=bootstrap[i]->create(idx);
break;
}
}
}
} else {
for ( i=0; bootstrap[i]; ++i ) {
if ( bootstrap[i]->available() ) {
audio = bootstrap[i]->create(idx);
if ( audio != NULL ) {
break;
}
}
}
}
if ( audio == NULL ) {
SDL_SetError("No available audio device");
#if 0 /* Don't fail SDL_Init() if audio isn't available.
SDL_OpenAudio() will handle it at that point. *sigh*
*/
return(-1);
#endif
}
}
current_audio = audio;
if ( current_audio ) {
current_audio->name = bootstrap[i]->name;
380
381
382
383
if ( !current_audio->LockAudio && !current_audio->UnlockAudio ) {
current_audio->LockAudio = SDL_LockAudio_Default;
current_audio->UnlockAudio = SDL_UnlockAudio_Default;
}
384
385
386
387
388
389
390
}
return(0);
}
char *SDL_AudioDriverName(char *namebuf, int maxlen)
{
if ( current_audio != NULL ) {
391
SDL_strlcpy(namebuf, current_audio->name, maxlen);
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
return(namebuf);
}
return(NULL);
}
int SDL_OpenAudio(SDL_AudioSpec *desired, SDL_AudioSpec *obtained)
{
SDL_AudioDevice *audio;
/* Start up the audio driver, if necessary */
if ( ! current_audio ) {
if ( (SDL_InitSubSystem(SDL_INIT_AUDIO) < 0) ||
(current_audio == NULL) ) {
return(-1);
}
}
audio = current_audio;
410
411
412
413
414
if (audio->opened) {
SDL_SetError("Audio device is already opened");
return(-1);
}
415
416
417
418
419
420
421
422
/* Verify some parameters */
if ( desired->callback == NULL ) {
SDL_SetError("SDL_OpenAudio() passed a NULL callback");
return(-1);
}
switch ( desired->channels ) {
case 1: /* Mono */
case 2: /* Stereo */
423
424
case 4: /* surround */
case 6: /* surround with center and lfe */
425
426
427
428
429
430
break;
default:
SDL_SetError("1 (mono) and 2 (stereo) channels supported");
return(-1);
}
431
#if defined(__MACOS__) || (defined(__RISCOS__) && SDL_THREADS_DISABLED)
432
/* FIXME: Need to implement PPC interrupt asm for SDL_LockAudio() */
433
#else
434
#if defined(__MINT__) && SDL_THREADS_DISABLED
435
/* Uses interrupt driven audio, without thread */
436
437
438
439
440
441
442
443
#else
/* Create a semaphore for locking the sound buffers */
audio->mixer_lock = SDL_CreateMutex();
if ( audio->mixer_lock == NULL ) {
SDL_SetError("Couldn't create mixer lock");
SDL_CloseAudio();
return(-1);
}
444
#endif /* __MINT__ */
445
#endif /* __MACOS__ */
446
447
448
449
450
/* Calculate the silence and size of the audio specification */
SDL_CalculateAudioSpec(desired);
/* Open the audio subsystem */
451
SDL_memcpy(&audio->spec, desired, sizeof(audio->spec));
452
453
454
audio->convert.needed = 0;
audio->enabled = 1;
audio->paused = 1;
455
456
#if !SDL_AUDIO_DRIVER_AHI
457
458
/* AmigaOS opens audio inside the main loop */
459
audio->opened = audio->OpenAudio(audio, &audio->spec)+1;
460
461
462
463
464
if ( ! audio->opened ) {
SDL_CloseAudio();
return(-1);
}
465
466
467
468
#else
D(bug("Locking semaphore..."));
SDL_mutexP(audio->mixer_lock);
469
470
471
472
473
474
475
476
477
478
479
480
481
482
audio->thread = SDL_CreateThread(SDL_RunAudio, audio);
D(bug("Created thread...\n"));
if ( audio->thread == NULL ) {
SDL_mutexV(audio->mixer_lock);
SDL_CloseAudio();
SDL_SetError("Couldn't create audio thread");
return(-1);
}
while(!audio_configured)
SDL_Delay(100);
#endif
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
/* If the audio driver changes the buffer size, accept it */
if ( audio->spec.samples != desired->samples ) {
desired->samples = audio->spec.samples;
SDL_CalculateAudioSpec(desired);
}
/* Allocate a fake audio memory buffer */
audio->fake_stream = SDL_AllocAudioMem(audio->spec.size);
if ( audio->fake_stream == NULL ) {
SDL_CloseAudio();
SDL_OutOfMemory();
return(-1);
}
/* See if we need to do any conversion */
499
if ( obtained != NULL ) {
500
SDL_memcpy(obtained, &audio->spec, sizeof(audio->spec));
501
502
503
504
505
506
507
508
509
510
511
} else if ( desired->freq != audio->spec.freq ||
desired->format != audio->spec.format ||
desired->channels != audio->spec.channels ) {
/* Build an audio conversion block */
if ( SDL_BuildAudioCVT(&audio->convert,
desired->format, desired->channels,
desired->freq,
audio->spec.format, audio->spec.channels,
audio->spec.freq) < 0 ) {
SDL_CloseAudio();
return(-1);
512
}
513
514
515
516
517
if ( audio->convert.needed ) {
audio->convert.len = desired->size;
audio->convert.buf =(Uint8 *)SDL_AllocAudioMem(
audio->convert.len*audio->convert.len_mult);
if ( audio->convert.buf == NULL ) {
518
SDL_CloseAudio();
519
SDL_OutOfMemory();
520
521
522
523
524
return(-1);
}
}
}
525
#if !SDL_AUDIO_DRIVER_AHI
526
527
528
529
/* Start the audio thread if necessary */
switch (audio->opened) {
case 1:
/* Start the audio thread */
530
#if (defined(__WIN32__) && !defined(_WIN32_WCE)) && !defined(HAVE_LIBC)
531
532
533
#undef SDL_CreateThread
audio->thread = SDL_CreateThread(SDL_RunAudio, audio, NULL, NULL);
#else
534
audio->thread = SDL_CreateThread(SDL_RunAudio, audio);
535
#endif
536
537
538
539
540
541
542
543
544
545
546
if ( audio->thread == NULL ) {
SDL_CloseAudio();
SDL_SetError("Couldn't create audio thread");
return(-1);
}
break;
default:
/* The audio is now playing */
break;
}
547
548
549
550
551
552
#else
SDL_mutexV(audio->mixer_lock);
D(bug("SDL_OpenAudio USCITA...\n"));
#endif
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
return(0);
}
SDL_audiostatus SDL_GetAudioStatus(void)
{
SDL_AudioDevice *audio = current_audio;
SDL_audiostatus status;
status = SDL_AUDIO_STOPPED;
if ( audio && audio->enabled ) {
if ( audio->paused ) {
status = SDL_AUDIO_PAUSED;
} else {
status = SDL_AUDIO_PLAYING;
}
}
return(status);
}
void SDL_PauseAudio (int pause_on)
{
SDL_AudioDevice *audio = current_audio;
if ( audio ) {
audio->paused = pause_on;
}
}
void SDL_LockAudio (void)
{
SDL_AudioDevice *audio = current_audio;
/* Obtain a lock on the mixing buffers */
586
587
if ( audio && audio->LockAudio ) {
audio->LockAudio(audio);
588
589
590
591
592
593
594
595
}
}
void SDL_UnlockAudio (void)
{
SDL_AudioDevice *audio = current_audio;
/* Release lock on the mixing buffers */
596
597
if ( audio && audio->UnlockAudio ) {
audio->UnlockAudio(audio);
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
}
}
void SDL_CloseAudio (void)
{
SDL_QuitSubSystem(SDL_INIT_AUDIO);
}
void SDL_AudioQuit(void)
{
SDL_AudioDevice *audio = current_audio;
if ( audio ) {
audio->enabled = 0;
if ( audio->thread != NULL ) {
SDL_WaitThread(audio->thread, NULL);
}
if ( audio->mixer_lock != NULL ) {
SDL_DestroyMutex(audio->mixer_lock);
}
if ( audio->fake_stream != NULL ) {
SDL_FreeAudioMem(audio->fake_stream);
}
if ( audio->convert.needed ) {
SDL_FreeAudioMem(audio->convert.buf);
623
624
}
625
#if !SDL_AUDIO_DRIVER_AHI
626
627
628
629
if ( audio->opened ) {
audio->CloseAudio(audio);
audio->opened = 0;
}
630
#endif
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
/* Free the driver data */
audio->free(audio);
current_audio = NULL;
}
}
#define NUM_FORMATS 6
static int format_idx;
static int format_idx_sub;
static Uint16 format_list[NUM_FORMATS][NUM_FORMATS] = {
{ AUDIO_U8, AUDIO_S8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB },
{ AUDIO_S8, AUDIO_U8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB },
{ AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_U8, AUDIO_S8 },
{ AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_U8, AUDIO_S8 },
{ AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U8, AUDIO_S8 },
{ AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_U8, AUDIO_S8 },
};
Uint16 SDL_FirstAudioFormat(Uint16 format)
{
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());
}
Uint16 SDL_NextAudioFormat(void)
{
if ( (format_idx == NUM_FORMATS) || (format_idx_sub == NUM_FORMATS) ) {
return(0);
}
return(format_list[format_idx][format_idx_sub++]);
}
void SDL_CalculateAudioSpec(SDL_AudioSpec *spec)
{
switch (spec->format) {
case AUDIO_U8:
spec->silence = 0x80;
break;
default:
spec->silence = 0x00;
break;
}
spec->size = (spec->format&0xFF)/8;
spec->size *= spec->channels;
spec->size *= spec->samples;
}