/
SDL_audio.c
670 lines (597 loc) · 15.6 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
23
24
25
26
27
28
29
*/
/* Allow access to a raw mixing buffer */
#include "SDL.h"
#include "SDL_audio_c.h"
#include "SDL_audiomem.h"
#include "SDL_sysaudio.h"
30
31
32
33
34
35
#ifdef __OS2__
// We'll need the DosSetPriority() API!
#define INCL_DOSPROCESS
#include <os2.h>
#endif
36
37
/* Available audio drivers */
static AudioBootStrap *bootstrap[] = {
38
#if SDL_AUDIO_DRIVER_OPENBSD
39
&OPENBSD_AUDIO_bootstrap,
40
#endif
41
#if SDL_AUDIO_DRIVER_OSS
42
43
44
&DSP_bootstrap,
&DMA_bootstrap,
#endif
45
#if SDL_AUDIO_DRIVER_ALSA
46
47
&ALSA_bootstrap,
#endif
48
#if SDL_AUDIO_DRIVER_QNXNTO
49
50
&QNXNTOAUDIO_bootstrap,
#endif
51
#if SDL_AUDIO_DRIVER_SUNAUDIO
52
53
&SUNAUDIO_bootstrap,
#endif
54
#if SDL_AUDIO_DRIVER_DMEDIA
55
&DMEDIA_bootstrap,
56
#endif
57
58
#if SDL_AUDIO_DRIVER_ARTS
&ARTS_bootstrap,
59
#endif
60
#if SDL_AUDIO_DRIVER_ESD
61
62
&ESD_bootstrap,
#endif
63
#if SDL_AUDIO_DRIVER_NAS
64
65
&NAS_bootstrap,
#endif
66
#if SDL_AUDIO_DRIVER_DSOUND
67
68
&DSOUND_bootstrap,
#endif
69
#if SDL_AUDIO_DRIVER_WAVEOUT
70
71
&WAVEOUT_bootstrap,
#endif
72
73
74
75
#if SDL_AUDIO_DRIVER_PAUD
&Paud_bootstrap,
#endif
#if SDL_AUDIO_DRIVER_BAUDIO
76
77
&BAUDIO_bootstrap,
#endif
78
#if SDL_AUDIO_DRIVER_COREAUDIO
79
80
&COREAUDIO_bootstrap,
#endif
81
#if SDL_AUDIO_DRIVER_SNDMGR
82
83
&SNDMGR_bootstrap,
#endif
84
#if SDL_AUDIO_DRIVER_AHI
85
86
&AHI_bootstrap,
#endif
87
#if SDL_AUDIO_DRIVER_MINT
88
89
90
91
92
&MINTAUDIO_GSXB_bootstrap,
&MINTAUDIO_MCSN_bootstrap,
&MINTAUDIO_STFA_bootstrap,
&MINTAUDIO_XBIOS_bootstrap,
&MINTAUDIO_DMA8_bootstrap,
93
#endif
94
#if SDL_AUDIO_DRIVER_DISK
95
&DISKAUD_bootstrap,
96
#endif
97
#if SDL_AUDIO_DRIVER_DC
98
&DCAUD_bootstrap,
99
#endif
100
#if SDL_AUDIO_DRIVER_DRENDERER
101
&DRENDERER_bootstrap,
102
#endif
103
104
105
106
107
#if SDL_AUDIO_DRIVER_MMEAUDIO
&MMEAUDIO_bootstrap,
#endif
#if SDL_AUDIO_DRIVER_DART
&DART_bootstrap,
108
#endif
109
110
111
112
113
114
115
116
NULL
};
SDL_AudioDevice *current_audio = NULL;
/* Various local functions */
int SDL_AudioInit(const char *driver_name);
void SDL_AudioQuit(void);
117
118
119
#ifdef ENABLE_AHI
static int audio_configured = 0;
#endif
120
121
122
123
124
125
126
127
128
129
/* 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;
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
#ifdef ENABLE_AHI
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
145
146
147
148
149
150
151
152
153
154
/* 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;
155
156
157
158
159
160
161
162
163
#ifdef ENABLE_AHI
audio_configured = 1;
D(bug("Audio configured... Checking for conversion\n"));
SDL_mutexP(audio->mixer_lock);
D(bug("Semaphore obtained...\n"));
#endif
164
165
166
167
168
169
170
171
172
173
174
175
176
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;
}
stream = audio->fake_stream;
177
178
179
180
181
#ifdef ENABLE_AHI
SDL_mutexV(audio->mixer_lock);
D(bug("Entering audio loop...\n"));
#endif
182
183
184
185
186
187
188
189
190
191
#ifdef __OS2__
// Increase the priority of this thread to make sure that
// the audio will be continuous all the time!
#ifdef USE_DOSSETPRIORITY
#ifdef DEBUG_BUILD
printf("[SDL_RunAudio] : Setting priority to ForegroundServer+0! (TID%d)\n", SDL_ThreadID());
#endif
DosSetPriority(PRTYS_THREAD, PRTYC_FOREGROUNDSERVER, 0, 0);
#endif
#endif
192
193
194
195
196
197
198
199
/* 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 {
200
201
202
#ifdef ENABLE_AHI
if ( started > 1 )
#endif
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
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;
}
}
219
SDL_memset(stream, silence, stream_len);
220
221
222
223
224
225
226
227
228
229
230
231
232
233
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;
}
234
SDL_memcpy(stream, audio->convert.buf,
235
236
237
238
239
240
audio->convert.len_cvt);
}
/* Ready current buffer for play and change current buffer */
if ( stream != audio->fake_stream ) {
audio->PlayAudio(audio);
241
242
243
244
#ifdef ENABLE_AHI
/* AmigaOS don't have to wait the first time audio is played! */
started++;
#endif
245
246
247
248
249
250
}
}
/* Wait for the audio to drain.. */
if ( audio->WaitDone ) {
audio->WaitDone(audio);
}
251
252
253
254
255
256
257
258
#ifdef ENABLE_AHI
D(bug("WaitAudio...Done\n"));
audio->CloseAudio(audio);
D(bug("CloseAudio..Done, subtask exiting...\n"));
audio_configured = 0;
259
260
261
262
263
#endif
#ifdef __OS2__
#ifdef DEBUG_BUILD
printf("[SDL_RunAudio] : Task exiting. (TID%d)\n", SDL_ThreadID());
#endif
264
#endif
265
266
267
return(0);
}
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
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);
}
284
285
286
287
288
289
290
291
292
293
294
295
296
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;
297
#if SDL_AUDIO_DRIVER_ESD
298
if ( (driver_name == NULL) && (SDL_getenv("ESPEAKER") != NULL) ) {
299
300
301
302
303
/* 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 ) {
304
if ( SDL_strcmp(bootstrap[i]->name, "esd") == 0 ) {
305
#ifdef HAVE_PUTENV
306
307
308
const char *esd_no_spawn;
/* Don't start ESD if it's not running */
309
esd_no_spawn = getenv("ESD_NO_SPAWN");
310
311
312
if ( esd_no_spawn == NULL ) {
putenv("ESD_NO_SPAWN=1");
}
313
#endif
314
315
316
317
if ( bootstrap[i]->available() ) {
audio = bootstrap[i]->create(0);
break;
}
318
#ifdef HAVE_UNSETENV
319
320
321
322
323
324
325
if ( esd_no_spawn == NULL ) {
unsetenv("ESD_NO_SPAWN");
}
#endif
}
}
}
326
#endif /* SDL_AUDIO_DRIVER_ESD */
327
328
329
if ( audio == NULL ) {
if ( driver_name != NULL ) {
#if 0 /* This will be replaced with a better driver selection API */
330
331
if ( SDL_strrchr(driver_name, ':') != NULL ) {
idx = atoi(SDL_strrchr(driver_name, ':')+1);
332
333
334
}
#endif
for ( i=0; bootstrap[i]; ++i ) {
335
336
if (SDL_strncmp(bootstrap[i]->name, driver_name,
SDL_strlen(bootstrap[i]->name)) == 0) {
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
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;
365
366
367
368
if ( !current_audio->LockAudio && !current_audio->UnlockAudio ) {
current_audio->LockAudio = SDL_LockAudio_Default;
current_audio->UnlockAudio = SDL_UnlockAudio_Default;
}
369
370
371
372
373
374
375
}
return(0);
}
char *SDL_AudioDriverName(char *namebuf, int maxlen)
{
if ( current_audio != NULL ) {
376
SDL_strlcpy(namebuf, current_audio->name, maxlen);
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
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;
395
396
397
398
399
if (audio->opened) {
SDL_SetError("Audio device is already opened");
return(-1);
}
400
401
402
403
404
405
406
407
/* 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 */
408
409
case 4: /* surround */
case 6: /* surround with center and lfe */
410
411
412
413
414
415
break;
default:
SDL_SetError("1 (mono) and 2 (stereo) channels supported");
return(-1);
}
416
#if defined(macintosh) || (defined(__riscos__) && SDL_THREADS_DISABLED)
417
/* FIXME: Need to implement PPC interrupt asm for SDL_LockAudio() */
418
#else
419
#if defined(__MINT__) && SDL_THREADS_DISABLED
420
/* Uses interrupt driven audio, without thread */
421
422
423
424
425
426
427
428
#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);
}
429
430
#endif /* __MINT__ */
#endif /* macintosh */
431
432
433
434
435
/* Calculate the silence and size of the audio specification */
SDL_CalculateAudioSpec(desired);
/* Open the audio subsystem */
436
SDL_memcpy(&audio->spec, desired, sizeof(audio->spec));
437
438
439
audio->convert.needed = 0;
audio->enabled = 1;
audio->paused = 1;
440
441
442
443
#ifndef ENABLE_AHI
/* AmigaOS opens audio inside the main loop */
444
audio->opened = audio->OpenAudio(audio, &audio->spec)+1;
445
446
447
448
449
if ( ! audio->opened ) {
SDL_CloseAudio();
return(-1);
}
450
451
452
453
#else
D(bug("Locking semaphore..."));
SDL_mutexP(audio->mixer_lock);
454
455
456
457
#if (defined(_WIN32) && !defined(_WIN32_WCE)) && !defined(HAVE_LIBC)
#undef SDL_CreateThread
audio->thread = SDL_CreateThread(SDL_RunAudio, audio, NULL, NULL);
#else
458
audio->thread = SDL_CreateThread(SDL_RunAudio, audio);
459
#endif
460
461
462
463
464
465
466
467
468
469
470
471
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
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
/* 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 */
488
if ( obtained != NULL ) {
489
SDL_memcpy(obtained, &audio->spec, sizeof(audio->spec));
490
491
492
493
494
495
496
497
498
499
500
} 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);
501
}
502
503
504
505
506
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 ) {
507
SDL_CloseAudio();
508
SDL_OutOfMemory();
509
510
511
512
513
return(-1);
}
}
}
514
#ifndef ENABLE_AHI
515
516
517
518
/* Start the audio thread if necessary */
switch (audio->opened) {
case 1:
/* Start the audio thread */
519
520
521
522
#if (defined(_WIN32) && !defined(_WIN32_WCE)) && !defined(HAVE_LIBC)
#undef SDL_CreateThread
audio->thread = SDL_CreateThread(SDL_RunAudio, audio, NULL, NULL);
#else
523
audio->thread = SDL_CreateThread(SDL_RunAudio, audio);
524
#endif
525
526
527
528
529
530
531
532
533
534
535
if ( audio->thread == NULL ) {
SDL_CloseAudio();
SDL_SetError("Couldn't create audio thread");
return(-1);
}
break;
default:
/* The audio is now playing */
break;
}
536
537
538
539
540
541
#else
SDL_mutexV(audio->mixer_lock);
D(bug("SDL_OpenAudio USCITA...\n"));
#endif
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
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 */
575
576
if ( audio && audio->LockAudio ) {
audio->LockAudio(audio);
577
578
579
580
581
582
583
584
}
}
void SDL_UnlockAudio (void)
{
SDL_AudioDevice *audio = current_audio;
/* Release lock on the mixing buffers */
585
586
if ( audio && audio->UnlockAudio ) {
audio->UnlockAudio(audio);
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
}
}
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);
612
613
}
614
#ifndef ENABLE_AHI
615
616
617
618
if ( audio->opened ) {
audio->CloseAudio(audio);
audio->opened = 0;
}
619
#endif
620
621
622
623
624
625
626
627
628
629
630
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
/* 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;
}