This repository has been archived by the owner on Feb 11, 2021. It is now read-only.
/
SDL_coreaudio.c
590 lines (486 loc) · 18.7 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
20
21
Sam Lantinga
slouken@libsdl.org
*/
22
#include "SDL_config.h"
23
24
#include <CoreAudio/CoreAudio.h>
25
26
27
#include <AudioUnit/AudioUnit.h>
#include "SDL_audio.h"
28
29
#include "../SDL_audio_c.h"
#include "../SDL_sysaudio.h"
30
31
#include "SDL_coreaudio.h"
32
#define DEBUG_COREAUDIO 0
33
34
35
36
37
38
typedef struct COREAUDIO_DeviceList
{
AudioDeviceID id;
const char *name;
} COREAUDIO_DeviceList;
39
40
41
42
43
static COREAUDIO_DeviceList *inputDevices = NULL;
static int inputDeviceCount = 0;
static COREAUDIO_DeviceList *outputDevices = NULL;
static int outputDeviceCount = 0;
44
45
46
static void
free_device_list(COREAUDIO_DeviceList **devices, int *devCount)
47
{
48
49
50
51
52
53
54
55
if (*devices) {
int i = *devCount;
while (i--)
SDL_free((void *) (*devices)[i].name);
SDL_free(*devices);
*devices = NULL;
}
*devCount = 0;
56
57
}
58
59
static void
60
build_device_list(int iscapture, COREAUDIO_DeviceList **devices, int *devCount)
61
{
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
Boolean outWritable = 0;
OSStatus result = noErr;
UInt32 size = 0;
AudioDeviceID *devs = NULL;
UInt32 i = 0;
UInt32 max = 0;
free_device_list(devices, devCount);
result = AudioHardwareGetPropertyInfo(kAudioHardwarePropertyDevices,
&size, &outWritable);
if (result != kAudioHardwareNoError)
return;
devs = (AudioDeviceID *) alloca(size);
if (devs == NULL)
return;
max = size / sizeof (AudioDeviceID);
*devices = (COREAUDIO_DeviceList *) SDL_malloc(max * sizeof (**devices));
if (*devices == NULL)
return;
result = AudioHardwareGetProperty(kAudioHardwarePropertyDevices,
&size, devs);
if (result != kAudioHardwareNoError)
return;
for (i = 0; i < max; i++) {
CFStringRef cfstr = NULL;
char *ptr = NULL;
AudioDeviceID dev = devs[i];
AudioBufferList *buflist = NULL;
int usable = 0;
CFIndex len = 0;
result = AudioDeviceGetPropertyInfo(dev, 0, iscapture,
kAudioDevicePropertyStreamConfiguration,
&size, &outWritable);
if (result != noErr)
continue;
buflist = (AudioBufferList *) SDL_malloc(size);
if (buflist == NULL)
continue;
result = AudioDeviceGetProperty(dev, 0, iscapture,
kAudioDevicePropertyStreamConfiguration,
&size, buflist);
if (result == noErr) {
UInt32 j;
for (j = 0; j < buflist->mNumberBuffers; j++) {
if (buflist->mBuffers[j].mNumberChannels > 0) {
usable = 1;
break;
}
}
}
SDL_free(buflist);
if (!usable)
continue;
size = sizeof (CFStringRef);
result = AudioDeviceGetProperty(dev, 0, iscapture,
kAudioObjectPropertyName,
&size, &cfstr);
if (result != kAudioHardwareNoError)
continue;
len = CFStringGetMaximumSizeForEncoding(CFStringGetLength(cfstr),
kCFStringEncodingUTF8);
ptr = (char *) SDL_malloc(len + 1);
usable = ( (ptr != NULL) &&
(CFStringGetCString(cfstr,ptr,len+1,kCFStringEncodingUTF8)) );
CFRelease(cfstr);
if (usable) {
len = strlen(ptr);
/* Some devices have whitespace at the end...trim it. */
while ((len > 0) && (ptr[len-1] == ' ')) {
len--;
}
usable = (len > 0);
}
if (!usable) {
SDL_free(ptr);
} else {
ptr[len] = '\0';
#if DEBUG_COREAUDIO
printf("COREAUDIO: Found %s device #%d: '%s' (devid %d)\n",
((iscapture) ? "capture" : "output"),
(int) *devCount, ptr, (int) dev);
#endif
(*devices)[*devCount].id = dev;
(*devices)[*devCount].name = ptr;
(*devCount)++;
}
}
170
171
}
172
173
static inline void
build_device_lists(void)
174
{
175
176
177
build_device_list(0, &outputDevices, &outputDeviceCount);
build_device_list(1, &inputDevices, &inputDeviceCount);
}
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
static inline void
free_device_lists(void)
{
free_device_list(&outputDevices, &outputDeviceCount);
free_device_list(&inputDevices, &inputDeviceCount);
}
static int
find_device_id(const char *devname, int iscapture, AudioDeviceID *id)
{
int i = ((iscapture) ? inputDeviceCount : outputDeviceCount);
COREAUDIO_DeviceList *devs = ((iscapture) ? inputDevices : outputDevices);
while (i--) {
if (SDL_strcmp(devname, devs->name) == 0) {
*id = devs->id;
return 1;
197
}
198
devs++;
199
200
}
201
202
203
204
205
206
207
208
209
210
211
212
213
214
return 0;
}
static int
COREAUDIO_DetectDevices(int iscapture)
{
if (iscapture) {
build_device_list(1, &inputDevices, &inputDeviceCount);
return inputDeviceCount;
} else {
build_device_list(0, &outputDevices, &outputDeviceCount);
return outputDeviceCount;
}
215
216
217
return 0; /* shouldn't ever hit this. */
}
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
static const char *
COREAUDIO_GetDeviceName(int index, int iscapture)
{
if ((iscapture) && (index < inputDeviceCount)) {
return inputDevices[index].name;
} else if ((!iscapture) && (index < outputDeviceCount)) {
return outputDevices[index].name;
}
SDL_SetError("No such device");
return NULL;
}
static void
COREAUDIO_Deinitialize(void)
{
free_device_lists();
238
239
240
241
}
/* The CoreAudio callback */
242
static OSStatus
243
244
outputCallback(void *inRefCon,
AudioUnitRenderActionFlags *ioActionFlags,
245
const AudioTimeStamp * inTimeStamp,
246
247
UInt32 inBusNumber, UInt32 inNumberFrames,
AudioBufferList *ioDataList)
248
{
249
SDL_AudioDevice *this = (SDL_AudioDevice *) inRefCon;
250
AudioBuffer *ioData = &ioDataList->mBuffers[0];
251
252
253
UInt32 remaining, len;
void *ptr;
254
255
256
257
258
/* Is there ever more than one buffer, and what do you do with it? */
if (ioDataList->mNumberBuffers != 1) {
return noErr;
}
259
/* Only do anything if audio is enabled and not paused */
260
if (!this->enabled || this->paused) {
261
SDL_memset(ioData->mData, this->spec.silence, ioData->mDataByteSize);
262
263
return 0;
}
264
265
266
267
/* No SDL conversion should be needed here, ever, since we accept
any input format in OpenAudio, and leave the conversion to CoreAudio.
*/
268
/*
269
270
assert(!this->convert.needed);
assert(this->spec.channels == ioData->mNumberChannels);
271
*/
272
273
274
275
remaining = ioData->mDataByteSize;
ptr = ioData->mData;
while (remaining > 0) {
276
if (this->hidden->bufferOffset >= this->hidden->bufferSize) {
277
/* Generate the data */
278
279
SDL_memset(this->hidden->buffer, this->spec.silence,
this->hidden->bufferSize);
280
SDL_mutexP(this->mixer_lock);
281
282
(*this->spec.callback) (this->spec.userdata, this->hidden->buffer,
this->hidden->bufferSize);
283
SDL_mutexV(this->mixer_lock);
284
this->hidden->bufferOffset = 0;
285
}
286
287
len = this->hidden->bufferSize - this->hidden->bufferOffset;
288
289
if (len > remaining)
len = remaining;
290
291
292
SDL_memcpy(ptr,
(char *) this->hidden->buffer + this->hidden->bufferOffset,
len);
293
ptr = (char *) ptr + len;
294
remaining -= len;
295
this->hidden->bufferOffset += len;
296
}
297
298
299
300
return 0;
}
301
302
303
304
305
306
static OSStatus
inputCallback(void *inRefCon,
AudioUnitRenderActionFlags *ioActionFlags,
const AudioTimeStamp * inTimeStamp,
UInt32 inBusNumber, UInt32 inNumberFrames,
AudioBufferList *ioData)
307
{
308
309
310
//err = AudioUnitRender(afr->fAudioUnit, ioActionFlags, inTimeStamp, inBusNumber, inNumberFrames, afr->fAudioBuffer);
// !!! FIXME: write me!
return noErr;
311
312
313
}
314
315
static void
COREAUDIO_CloseDevice(_THIS)
316
{
317
if (this->hidden != NULL) {
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
if (this->hidden->audioUnitOpened) {
OSStatus result = noErr;
AURenderCallbackStruct callback;
const AudioUnitElement output_bus = 0;
const AudioUnitElement input_bus = 1;
const int iscapture = this->iscapture;
const AudioUnitElement bus = ((iscapture) ? input_bus : output_bus);
const AudioUnitScope scope = ((iscapture) ? kAudioUnitScope_Output :
kAudioUnitScope_Input);
/* stop processing the audio unit */
result = AudioOutputUnitStop(this->hidden->audioUnit);
/* Remove the input callback */
SDL_memset(&callback, '\0', sizeof (AURenderCallbackStruct));
result = AudioUnitSetProperty(this->hidden->audioUnit,
kAudioUnitProperty_SetRenderCallback,
scope, bus, &callback,
sizeof (callback));
CloseComponent(this->hidden->audioUnit);
this->hidden->audioUnitOpened = 0;
}
341
342
343
344
SDL_free(this->hidden->buffer);
SDL_free(this->hidden);
this->hidden = NULL;
}
345
346
347
}
348
349
350
351
352
#define CHECK_RESULT(msg) \
if (result != noErr) { \
COREAUDIO_CloseDevice(this); \
SDL_SetError("CoreAudio error (%s): %d", msg, (int) result); \
return 0; \
353
354
}
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
static int
find_device_by_name(_THIS, const char *devname, int iscapture)
{
AudioDeviceID devid = 0;
OSStatus result = noErr;
UInt32 size = 0;
UInt32 alive = 0;
pid_t pid = 0;
if (devname == NULL) {
size = sizeof (AudioDeviceID);
const AudioHardwarePropertyID propid =
((iscapture) ? kAudioHardwarePropertyDefaultInputDevice :
kAudioHardwarePropertyDefaultOutputDevice);
result = AudioHardwareGetProperty(propid, &size, &devid);
CHECK_RESULT("AudioHardwareGetProperty (default device)");
} else {
if (!find_device_id(devname, iscapture, &devid)) {
SDL_SetError("CoreAudio: No such audio device.");
return 0;
}
377
378
}
379
380
381
382
383
384
385
386
387
size = sizeof (alive);
result = AudioDeviceGetProperty(devid, 0, iscapture,
kAudioDevicePropertyDeviceIsAlive,
&size, &alive);
CHECK_RESULT("AudioDeviceGetProperty (kAudioDevicePropertyDeviceIsAlive)");
if (!alive) {
SDL_SetError("CoreAudio: requested device exists, but isn't alive.");
return 0;
388
}
389
390
391
392
size = sizeof (pid);
result = AudioDeviceGetProperty(devid, 0, iscapture,
kAudioDevicePropertyHogMode, &size, &pid);
393
394
395
396
397
/* some devices don't support this property, so errors are fine here. */
if ((result == noErr) && (pid != -1)) {
SDL_SetError("CoreAudio: requested device is being hogged.");
return 0;
398
399
}
400
401
402
403
this->hidden->deviceID = devid;
return 1;
}
404
405
406
407
static int
prepare_audiounit(_THIS, const char *devname, int iscapture,
const AudioStreamBasicDescription *strdesc)
408
409
{
OSStatus result = noErr;
410
AURenderCallbackStruct callback;
411
ComponentDescription desc;
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
Component comp = NULL;
int use_system_device = 0;
UInt32 enableIO = 0;
const AudioUnitElement output_bus = 0;
const AudioUnitElement input_bus = 1;
const AudioUnitElement bus = ((iscapture) ? input_bus : output_bus);
const AudioUnitScope scope = ((iscapture) ? kAudioUnitScope_Output :
kAudioUnitScope_Input);
if (!find_device_by_name(this, devname, iscapture)) {
SDL_SetError("Couldn't find requested CoreAudio device");
return 0;
}
SDL_memset(&desc, '\0', sizeof(ComponentDescription));
desc.componentType = kAudioUnitType_Output;
desc.componentSubType = kAudioUnitSubType_HALOutput;
desc.componentManufacturer = kAudioUnitManufacturer_Apple;
comp = FindNextComponent(NULL, &desc);
if (comp == NULL) {
SDL_SetError("Couldn't find requested CoreAudio component");
return 0;
}
/* Open & initialize the audio unit */
result = OpenAComponent(comp, &this->hidden->audioUnit);
CHECK_RESULT("OpenAComponent");
441
442
this->hidden->audioUnitOpened = 1;
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
// !!! FIXME: this is wrong?
enableIO = ((iscapture) ? 1 : 0);
result = AudioUnitSetProperty(this->hidden->audioUnit,
kAudioOutputUnitProperty_EnableIO,
kAudioUnitScope_Input, input_bus,
&enableIO, sizeof (enableIO));
CHECK_RESULT("AudioUnitSetProperty (kAudioUnitProperty_EnableIO input)");
// !!! FIXME: this is wrong?
enableIO = ((iscapture) ? 0 : 1);
result = AudioUnitSetProperty(this->hidden->audioUnit,
kAudioOutputUnitProperty_EnableIO,
kAudioUnitScope_Output, output_bus,
&enableIO, sizeof (enableIO));
CHECK_RESULT("AudioUnitSetProperty (kAudioUnitProperty_EnableIO output)");
result = AudioUnitSetProperty(this->hidden->audioUnit,
kAudioOutputUnitProperty_CurrentDevice,
kAudioUnitScope_Global, 0,
&this->hidden->deviceID,
sizeof (AudioDeviceID));
CHECK_RESULT("AudioUnitSetProperty (kAudioOutputUnitProperty_CurrentDevice)");
/* Set the data format of the audio unit. */
result = AudioUnitSetProperty(this->hidden->audioUnit,
kAudioUnitProperty_StreamFormat,
scope, bus, strdesc, sizeof (*strdesc));
CHECK_RESULT("AudioUnitSetProperty (kAudioUnitProperty_StreamFormat)");
/* Set the audio callback */
SDL_memset(&callback, '\0', sizeof (AURenderCallbackStruct));
callback.inputProc = ((iscapture) ? inputCallback : outputCallback);
callback.inputProcRefCon = this;
result = AudioUnitSetProperty(this->hidden->audioUnit,
kAudioUnitProperty_SetRenderCallback,
scope, bus, &callback, sizeof (callback));
CHECK_RESULT("AudioUnitSetProperty (kAudioUnitProperty_SetInputCallback)");
/* Calculate the final parameters for this audio specification */
SDL_CalculateAudioSpec(&this->spec);
/* Allocate a sample buffer */
this->hidden->bufferOffset = this->hidden->bufferSize = this->spec.size;
this->hidden->buffer = SDL_malloc(this->hidden->bufferSize);
result = AudioUnitInitialize(this->hidden->audioUnit);
CHECK_RESULT("AudioUnitInitialize");
/* Finally, start processing of the audio unit */
result = AudioOutputUnitStart(this->hidden->audioUnit);
CHECK_RESULT("AudioOutputUnitStart");
/* We're running! */
return 1;
}
static int
COREAUDIO_OpenDevice(_THIS, const char *devname, int iscapture)
{
503
AudioStreamBasicDescription strdesc;
504
SDL_AudioFormat test_format = SDL_FirstAudioFormat(this->spec.format);
505
int valid_datatype = 0;
506
507
508
509
510
511
512
513
514
515
/* Initialize all variables that we clean on shutdown */
this->hidden = (struct SDL_PrivateAudioData *)
SDL_malloc((sizeof *this->hidden));
if (this->hidden == NULL) {
SDL_OutOfMemory();
return (0);
}
SDL_memset(this->hidden, 0, (sizeof *this->hidden));
516
/* Setup a AudioStreamBasicDescription with the requested format */
517
SDL_memset(&strdesc, '\0', sizeof(AudioStreamBasicDescription));
518
519
strdesc.mFormatID = kAudioFormatLinearPCM;
strdesc.mFormatFlags = kLinearPCMFormatFlagIsPacked;
520
521
strdesc.mChannelsPerFrame = this->spec.channels;
strdesc.mSampleRate = this->spec.freq;
522
strdesc.mFramesPerPacket = 1;
523
524
while ((!valid_datatype) && (test_format)) {
525
this->spec.format = test_format;
526
527
/* Just a list of valid SDL formats, so people don't pass junk here. */
switch (test_format) {
528
529
530
531
532
533
534
535
536
537
538
case AUDIO_U8:
case AUDIO_S8:
case AUDIO_U16LSB:
case AUDIO_S16LSB:
case AUDIO_U16MSB:
case AUDIO_S16MSB:
case AUDIO_S32LSB:
case AUDIO_S32MSB:
case AUDIO_F32LSB:
case AUDIO_F32MSB:
valid_datatype = 1;
539
540
strdesc.mBitsPerChannel = SDL_AUDIO_BITSIZE(this->spec.format);
if (SDL_AUDIO_ISBIGENDIAN(this->spec.format))
541
542
strdesc.mFormatFlags |= kLinearPCMFormatFlagIsBigEndian;
543
if (SDL_AUDIO_ISFLOAT(this->spec.format))
544
strdesc.mFormatFlags |= kLinearPCMFormatFlagIsFloat;
545
else if (SDL_AUDIO_ISSIGNED(this->spec.format))
546
547
strdesc.mFormatFlags |= kLinearPCMFormatFlagIsSignedInteger;
break;
548
549
}
}
550
551
if (!valid_datatype) { /* shouldn't happen, but just in case... */
552
COREAUDIO_CloseDevice(this);
553
SDL_SetError("Unsupported audio format");
554
return 0;
555
}
556
557
558
559
560
strdesc.mBytesPerFrame =
strdesc.mBitsPerChannel * strdesc.mChannelsPerFrame / 8;
strdesc.mBytesPerPacket =
strdesc.mBytesPerFrame * strdesc.mFramesPerPacket;
561
562
if (!prepare_audiounit(this, devname, iscapture, &strdesc)) {
563
COREAUDIO_CloseDevice(this); \
564
return 0; /* prepare_audiounit() will call SDL_SetError()... */
565
}
566
567
568
return 1; /* good to go. */
}
569
570
571
572
573
574
575
576
577
578
579
static int
COREAUDIO_Init(SDL_AudioDriverImpl *impl)
{
/* Set the function pointers */
impl->DetectDevices = COREAUDIO_DetectDevices;
impl->GetDeviceName = COREAUDIO_GetDeviceName;
impl->OpenDevice = COREAUDIO_OpenDevice;
impl->CloseDevice = COREAUDIO_CloseDevice;
impl->Deinitialize = COREAUDIO_Deinitialize;
impl->ProvidesOwnCallbackThread = 1;
580
581
582
583
build_device_lists(); /* do an initial check for devices... */
return 1;
584
}
585
586
587
588
589
AudioBootStrap COREAUDIO_bootstrap = {
"coreaudio", "Mac OS X CoreAudio", COREAUDIO_Init, 0
};
590
/* vi: set ts=4 sw=4 expandtab: */