-
Notifications
You must be signed in to change notification settings - Fork 3
/
listing1.html
executable file
·566 lines (472 loc) · 20 KB
/
listing1.html
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
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
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
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
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
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
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
441
442
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
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
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
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/1999/REC-html401-19991224/loose.dtd">
<html>
<head>
<!-- BEGIN META TAG INFO -->
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<link rel="home" href="http://developer.apple.com/">
<link rel="find" href="http://developer.apple.com/search/">
<link rel="stylesheet" type="text/css" href="../../documentation/css/adcstyle.css" title="fonts">
<script language="JavaScript" src="../../documentation/js/adc.js" type="text/javascript"></script>
<!-- END META TAG INFO -->
<!-- BEGIN TITLE -->
<title>SimpleAudioExtraction - /CoreAudioUtils.c</title>
<!-- END TITLE -->
<script language="JavaScript">
function JumpToNewPage() {
window.location=document.scpopupmenu.gotop.value;
return true;
}
</script>
</head>
<!-- BEGIN BODY OPEN -->
<body>
<!--END BODY OPEN -->
<!-- START CENTER OPEN -->
<center>
<!-- END CENTER OPEN -->
<!-- BEGIN LOGO AND SEARCH -->
<!--#include virtual="/includes/adcnavbar"-->
<!-- END LOGO AND SEARCH -->
<!-- START BREADCRUMB -->
<div id="breadcrumb">
<table width="680" border="0" cellpadding="0" cellspacing="0">
<tr>
<td scope="row"><img width="340" height="10" src="images/1dot.gif" alt=""></td>
<td><img width="340" height="10" src="images/1dot.gif" alt=""></td>
</tr>
<tr valign="middle">
<td align="left" colspan="2">
<a href="http://developer.apple.com/">ADC Home</a> > <a href="../../referencelibrary/index.html">Reference Library</a> > <a href="../../samplecode/index.html">Sample Code</a> > <a href="../../samplecode/QuickTime/index.html">QuickTime</a> > <a href="../../samplecode/QuickTime/idxMusicAudio-date.html">Audio</a> > <A HREF="javascript:location.replace('index.html');">SimpleAudioExtraction</A> >
</td>
</tr>
<tr>
<td colspan="2" scope="row"><img width="680" height="35" src="images/1dot.gif" alt=""></td>
</tr>
</table>
</div>
<!-- END BREADCRUMB -->
<!-- START MAIN CONTENT -->
<!-- START TITLE GRAPHIC AND INTRO-->
<table width="680" border="0" cellpadding="0" cellspacing="0">
<tr align="left" valign="top">
<td><h1><div id="pagehead">SimpleAudioExtraction</div></h1></td>
</tr>
</table>
<!-- END TITLE GRAPHIC AND INTRO -->
<!-- START WIDE COLUMN -->
<table width="680" border="0" cellpadding="0" cellspacing="0">
<tr align="left" valign="top">
<td id="scdetails">
<h2>/CoreAudioUtils.c</h2>
<form name="scpopupmenu" onSubmit="return false;" method=post>
<p><strong>View Source Code:</strong>
<select name="gotop" onChange="JumpToNewPage();" style="width:340px"><option selected value="ingnore">Select File</option>
<option value="listing1.html">/CoreAudioUtils.c</option>
<option value="listing2.html">/CoreAudioUtils.h</option>
<option value="listing3.html">/ExtractAndPlay.c</option>
<option value="listing4.html">/ExtractAndPlay.h</option>
<option value="listing5.html">/main.c</option>
<option value="listing6.html">/MovieAudioExtractionUtils.c</option>
<option value="listing7.html">/MovieAudioExtractionUtils.h</option>
<option value="listing8.html">/QuickTimeUtils.c</option>
<option value="listing9.html">/QuickTimeUtils.h</option></select>
</p>
</form>
<p><strong><a href="SimpleAudioExtraction.zip">Download Sample</a></strong> (“SimpleAudioExtraction.zip”, 90.5K)<BR>
<strong><a href="SimpleAudioExtraction.dmg">Download Sample</a></strong> (“SimpleAudioExtraction.dmg”, 145.2K)</p>
<!--
<p><strong><a href="#">Download Sample</a></strong> (“filename.sit”, 500K)</p>
-->
</td>
</tr>
<tr>
<td scope="row"><img width="680" height="10" src="images/1dot.gif" alt=""><br>
<img height="1" width="680" src="images/1dot_919699.gif" alt=""><br>
<img width="680" height="20" src="images/1dot.gif" alt=""></td>
</tr>
<tr>
<td scope="row">
<!--googleon: index -->
<pre class="sourcecodebox">/*
File: CoreAudioUtils.c
Description: Utility functions for building a simple AUGraph
to play buffers of audio data.
Originally introduced at WWDC 2005 at Session 201:
"Harnessing the Audio Capabilities of QuickTime 7"
Copyright: © Copyright 2004, 2005 Apple Computer, Inc.
All rights reserved.
Disclaimer: IMPORTANT: This Apple software is supplied to you by
Apple Computer, Inc. ("Apple") in consideration of your agreement to the
following terms, and your use, installation, modification or
redistribution of this Apple software constitutes acceptance of these
terms. If you do not agree with these terms, please do not use,
install, modify or redistribute this Apple software.
In consideration of your agreement to abide by the following terms, and
subject to these terms, Apple grants you a personal, non-exclusive
license, under Apple’s copyrights in this original Apple software (the
"Apple Software"), to use, reproduce, modify and redistribute the Apple
Software, with or without modifications, in source and/or binary forms;
provided that if you redistribute the Apple Software in its entirety and
without modifications, you must retain this notice and the following
text and disclaimers in all such redistributions of the Apple Software.
Neither the name, trademarks, service marks or logos of Apple Computer,
Inc. may be used to endorse or promote products derived from the Apple
Software without specific prior written permission from Apple. Except
as expressly stated in this notice, no other rights or licenses, express
or implied, are granted by Apple herein, including but not limited to
any patent rights that may be infringed by your derivative works or by
other works in which the Apple Software may be incorporated.
The Apple Software is provided by Apple on an "AS IS" basis. APPLE
MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION
THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND
OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.
IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL
OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION,
MODIFICATION AND/OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED
AND WHETHER UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE),
STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
*/
#include "CoreAudioUtils.h"
// Return a ComponentDescription for a default output device AU
static void ConfigureOutputDescription(ComponentDescription *inOutputDesc)
{
inOutputDesc->componentType = kAudioUnitType_Output;
inOutputDesc->componentSubType = kAudioUnitSubType_DefaultOutput;
inOutputDesc->componentManufacturer = kAudioUnitManufacturer_Apple;
inOutputDesc->componentFlags = 0;
inOutputDesc->componentFlagsMask = 0;
}
// Set the stream format on the output device AU.
// This only needs to set the input scope, since the output describes the audio hw settings.
static OSStatus SetOutputUnitStreamFormat(AudioUnit outputUnit, AudioStreamBasicDescription *asbd)
{
return (AudioUnitSetProperty(outputUnit, kAudioUnitProperty_StreamFormat,
kAudioUnitScope_Input, 0, asbd, sizeof(AudioStreamBasicDescription)));
}
// Set the channel layout on the output device AU.
// This only needs to set the input scope, since the output describes the audio hw settings.
// Setting the channel layout here helps route channels properly, but note that the OutputAU
// does not do channel mixdown.
static OSStatus SetOutputUnitChannelLayout(AudioUnit outputUnit, QTPropertyValuePtr layoutProperty, UInt32 size)
{
return (AudioUnitSetProperty(outputUnit, kAudioUnitProperty_AudioChannelLayout,
kAudioUnitScope_Input,0, layoutProperty, size));
}
// Return a ComponentDescription for a ScheduledSoundPlayer AU
static void ConfigureScheduledPlayerDescription(ComponentDescription *inPlayerDesc)
{
inPlayerDesc->componentType = kAudioUnitType_Generator;
inPlayerDesc->componentSubType = kAudioUnitSubType_ScheduledSoundPlayer;
inPlayerDesc->componentManufacturer = kAudioUnitManufacturer_Apple;
inPlayerDesc->componentFlags = 0;
inPlayerDesc->componentFlagsMask = 0;
}
//////////
//
// ConfigureEffectDescription
//
// Fills a ComponentDescription structure to describe a Audio Unit effect component.
// In this case, the effect component specified is the reverb effect.
//
//////////
static void ConfigureReverbEffectDescription(ComponentDescription *inEffectDesc)
{
inEffectDesc->componentType = kAudioUnitType_Effect;
inEffectDesc->componentSubType = kAudioUnitSubType_MatrixReverb;
inEffectDesc->componentManufacturer = kAudioUnitManufacturer_Apple;
inEffectDesc->componentFlags = 0;
inEffectDesc->componentFlagsMask = 0;
}
//////////
//
// SetPlayerUnitStreamFormat
//
// Set the stream format on the ScheduledSoundPlayer AU.
// This only needs to set the output scope, since the unit doesn't have an input scope.
//
//////////
static OSStatus SetPlayerUnitStreamFormat(AudioUnit playerUnit, AudioStreamBasicDescription *asbd)
{
return (AudioUnitSetProperty(playerUnit, kAudioUnitProperty_StreamFormat,
kAudioUnitScope_Output, 0, asbd, sizeof(AudioStreamBasicDescription)));
}
//////////
//
// SetPlayerUnitStreamFormat
//
// Set the stream format on the Effect AU.
//
//////////
static OSStatus SetEffectUnitStreamFormat(AudioUnit effectUnit, AudioStreamBasicDescription *asbd)
{
OSStatus status = noErr;
status = AudioUnitSetProperty(effectUnit, kAudioUnitProperty_StreamFormat,
kAudioUnitScope_Input, 0, asbd, sizeof(AudioStreamBasicDescription));
require(status == noErr, bail);
status = AudioUnitSetProperty(effectUnit, kAudioUnitProperty_StreamFormat,
kAudioUnitScope_Output, 0, asbd, sizeof(AudioStreamBasicDescription));
bail:
return status;
}
//////////
//
// SetReverbEffectParams
//
// Set the PreDelay and ModulationRate parameters for the Reverb Effect.
//
//////////
OSStatus SetReverbEffectParams(AudioUnit audioUnit)
{
Float32 preDelay = 0.01;
OSStatus status = AudioUnitSetParameter( audioUnit,
kReverbParam_PreDelay,
kAudioUnitScope_Input,
0,
preDelay,
0);
require(status == noErr, bail);
Float32 modulationRate = 1.7;
status = AudioUnitSetParameter( audioUnit,
kReverbParam_ModulationRate,
kAudioUnitScope_Input,
0,
modulationRate,
0);
bail:
return status;
}
//////////
//
// BuildAUGraphPlayer
//
// Build a simple AUGraph containing a Default Output AU sourced by a ScheduledSoundPlayer AU.
// This allows us to schedule (from any thread) buffers of audio data to play automatically.
//
//////////
OSStatus BuildAUGraphPlayer(AudioChannelLayout *layout, UInt32 layoutSize,
AudioStreamBasicDescription *asbd,
AUGraphPlayerRef *graphUnit, AudioUnit *thePlayerUnit)
{
OSStatus err = noErr;
// Create a new AUGraph
*graphUnit = nil;
err = NewAUGraph(graphUnit);
require(err == noErr, bail);
// Add an output unit, and a scheduled sound player unit
// Configure the two units.
ComponentDescription output_desc, player_desc;
ConfigureOutputDescription(&output_desc);
ConfigureScheduledPlayerDescription(&player_desc);
// Create new nodes inside our AUGraph for the output unit
// and the AUScheduledSoundPlayer unit.
AUNode outputNode, playerNode;
err = AUGraphNewNode(*graphUnit, &output_desc, 0, NULL, &outputNode);
require(err == noErr, bail);
err = AUGraphNewNode(*graphUnit, &player_desc, 0, NULL, &playerNode);
require(err == noErr, bail);
// Connect the two graph nodes together and specify the way inputs are ordered.
// The player node will route its output to the output node
// connect the player to the output unit.
err = AUGraphConnectNodeInput(*graphUnit, playerNode, 0, outputNode, 0);
require(err == noErr, bail);
// Open the graph: Instantiates every Audio Unit in the graph.
err = AUGraphOpen(*graphUnit);
require(err == noErr, bail);
// Get the output unit & the player unit from their respective nodes
AudioUnit theOutputUnit;
err = AUGraphGetNodeInfo(*graphUnit, outputNode, NULL, NULL, NULL, &theOutputUnit);
require(err == noErr, bail);
err = AUGraphGetNodeInfo(*graphUnit, playerNode, NULL, NULL, NULL, thePlayerUnit);
require(err == noErr, bail);
// Configure stream formats of the output and player to the specified format
err = SetOutputUnitStreamFormat(theOutputUnit, asbd);
require(err == noErr, bail);
err = SetPlayerUnitStreamFormat(*thePlayerUnit, asbd);
require(err == noErr, bail);
// Get the extraction channel layout and map the output device
err = SetOutputUnitChannelLayout(theOutputUnit, layout, layoutSize);
require(err == noErr, bail);
// Initialize the graph
err = AUGraphInitialize(*graphUnit);
bail:
if (err && (*graphUnit != nil))
{
AUGraphClose(*graphUnit);
}
return (err);
}
//////////
//
// BuildAUGraphPlayerWithEffect
//
// Build a simple AUGraph containing a Default Output AU sourced by an Effect AU which in turn is
// sourced by a ScheduledSoundPlayer AU.
// This allows us to schedule (from any thread) buffers of audio data to play automatically.
//
//////////
OSStatus BuildAUGraphPlayerWithEffect(AudioChannelLayout *layout, UInt32 layoutSize,
AudioStreamBasicDescription *asbd,
AUGraphPlayerRef *graphUnit, AudioUnit *thePlayerUnit,
AudioUnit *theEffectUnit)
{
OSStatus err = noErr;
// Create a new AUGraph
*graphUnit = nil;
err = NewAUGraph(graphUnit);
require(err == noErr, bail);
// Add an output unit, a scheduled sound player unit and
// an effect unit.
// Configure the three units.
ComponentDescription output_desc, player_desc, effect_desc;
ConfigureOutputDescription(&output_desc);
ConfigureScheduledPlayerDescription(&player_desc);
ConfigureReverbEffectDescription(&effect_desc);
// Create new nodes inside our AUGraph for the output unit,
// the AUScheduledSoundPlayer unit and the Effect unit.
AUNode outputNode, playerNode, effectNode;
err = AUGraphNewNode(*graphUnit, &output_desc, 0, NULL, &outputNode);
require(err == noErr, bail);
err = AUGraphNewNode(*graphUnit, &effect_desc, 0, NULL, &effectNode);
require(err == noErr, bail);
err = AUGraphNewNode(*graphUnit, &player_desc, 0, NULL, &playerNode);
require(err == noErr, bail);
// Connect the three graph nodes together and specify the way inputs are ordered.
// The player node will route its output to the effect node which will route its
// output to the output node
err = AUGraphConnectNodeInput(*graphUnit, playerNode, 0, effectNode, 0);
require(err == noErr, bail);
err = AUGraphConnectNodeInput(*graphUnit, effectNode, 0, outputNode, 0);
require(err == noErr, bail);
// Open the graph: Instantiates every Audio Unit in the graph.
err = AUGraphOpen(*graphUnit);
require(err == noErr, bail);
// Get the output, player and effect units from their respective nodes
AudioUnit theOutputUnit;
err = AUGraphGetNodeInfo(*graphUnit, outputNode, NULL, NULL, NULL, &theOutputUnit);
require(err == noErr, bail);
err = AUGraphGetNodeInfo(*graphUnit, playerNode, NULL, NULL, NULL, thePlayerUnit);
require(err == noErr, bail);
err = AUGraphGetNodeInfo(*graphUnit, effectNode, NULL, NULL, NULL, theEffectUnit);
require(err == noErr, bail);
// Configure stream formats of the output, player and effect to the specified format
err = SetOutputUnitStreamFormat(theOutputUnit, asbd);
require(err == noErr, bail);
err = SetPlayerUnitStreamFormat(*thePlayerUnit, asbd);
require(err == noErr, bail);
err = SetEffectUnitStreamFormat(*theEffectUnit, asbd);
require(err == noErr, bail);
// Get the extraction channel layout and map the output device
err = SetOutputUnitChannelLayout(theOutputUnit, layout, layoutSize);
require(err == noErr, bail);
// Initialize the graph
err = AUGraphInitialize(*graphUnit);
require(err == noErr, bail);
// adjust some of the effect parameters
err = SetReverbEffectParams(*theEffectUnit);
bail:
if (err && (*graphUnit != nil))
{
AUGraphClose(*graphUnit);
}
return (err);
}
//////////
//
// StartAUGraphPlayer
//
// Start the player graph running.
//
//////////
OSStatus StartAUGraphPlayer(AUGraphPlayerRef graphUnit)
{
OSStatus err = noErr;
UInt32 numNodes;
AudioUnit playerUnit = nil;
// Start the AUGraph
err = AUGraphStart(graphUnit);
require(err == noErr, bail);
// Locate the AUScheduledSoundPlayer that we need to start.
// It was added last, so its node number is the node count.
err = AUGraphGetNodeCount(graphUnit, &numNodes);
if (!err)
{
err = AUGraphGetNodeInfo(graphUnit, numNodes, nil, nil, nil, &playerUnit);
}
require(err == noErr, bail);
require(playerUnit != nil, bail);
// Start playback of the scheduledPlayer unit by setting its start time.
AudioTimeStamp theTimeStamp = {0};
theTimeStamp.mFlags = kAudioTimeStampSampleTimeValid;
theTimeStamp.mSampleTime = -1.; // start now
err = AudioUnitSetProperty(playerUnit,
kAudioUnitProperty_ScheduleStartTimeStamp, kAudioUnitScope_Global, 0,
&theTimeStamp, sizeof(theTimeStamp));
bail:
return (err);
}
//////////
//
// StopAUGraphPlayer
//
//////////
void StopAUGraphPlayer(AUGraphPlayerRef graphUnit)
{
if (graphUnit != nil)
{
(void) AUGraphStop(graphUnit);
(void) AUGraphUninitialize(graphUnit);
}
}
//////////
//
// CloseAUGraphPlayer
//
//////////
void CloseAUGraphPlayer(AUGraphPlayerRef graphUnit)
{
if (graphUnit != nil)
{
StopAUGraphPlayer(graphUnit);
(void) AUGraphClose(graphUnit);
}
}</pre>
<!--googleoff: index -->
</td>
</tr>
</table>
<!-- END WIDE COLUMN -->
<!-- END MAIN CONTENT -->
<table width="680" border="0" cellpadding="0" cellspacing="0">
<tr>
<td><div style="width: 100%; height: 1px; background-color: #919699; margin-top: 5px; margin-bottom: 15px"></div></td>
</tr>
<tr>
<td align="center"><br/>
<table border="0" cellpadding="0" cellspacing="0" class="graybox">
<tr>
<th>Did this document help you?</th>
</tr>
<tr>
<td>
<div style="margin-bottom: 8px"><a href="http://developer.apple.com/feedback/?v=1&url=/samplecode/SimpleAudioExtraction/listing1.html%3Fid%3DDTS10003740-1.0&media=dvd" target=_new>Yes</a>: Tell us what works for you.</div>
<div style="margin-bottom: 8px"><a href="http://developer.apple.com/feedback/?v=2&url=/samplecode/SimpleAudioExtraction/listing1.html%3Fid%3DDTS10003740-1.0&media=dvd" target=_new>It’s good, but:</a> Report typos, inaccuracies, and so forth.</div>
<div><a href="http://developer.apple.com/feedback/?v=3&url=/samplecode/SimpleAudioExtraction/listing1.html%3Fid%3DDTS10003740-1.0&media=dvd" target=_new>It wasn’t helpful</a>: Tell us what would have helped.</div>
</td>
</tr>
</table>
</td>
</tr>
</table>
<!-- START BOTTOM APPLE NAVIGATION -->
<!--#include virtual="/includes/footer"-->
<!-- END BOTTOM APPLE NAVIGATION -->
<!-- START CENTER CLOSE -->
</center>
<!-- END CENTER CLOSE -->
</body>
</html>