forked from cellularmitosis/ADC-reference-library-2009-july
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathlisting3.html
More file actions
executable file
·876 lines (733 loc) · 32 KB
/
Copy pathlisting3.html
File metadata and controls
executable file
·876 lines (733 loc) · 32 KB
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
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
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
612
613
614
615
616
617
618
619
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
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
<!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 - /ExtractAndPlay.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>/ExtractAndPlay.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: ExtractAndPlay
Description: Code to use the Audio Extraction APIs to extract audio out of QuickTime movies
Author: Apple DTS
Copyright: © Copyright 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.
Change History (most recent first):
*/
#import <CoreAudio/CoreAudio.h>
#include "ExtractAndPlay.h"
#include "CoreAudioUtils.h"
#include "MovieAudioExtractionUtils.h"
#pragma mark ----- Typedefs -----
// NEW
struct ExtractionInfoForCallback
{
AudioStreamBasicDescription asbd;
AudioChannelLayout *layout;
UInt32 layoutSize;
Boolean discrete;
SInt64 samplesRemaining;
Boolean playerUnitStarted;
ScheduledAudioSlice *sliceList;
Float64 sampleTimeStamp;
MovieAudioExtractionRef extractionSessionRef;
TimeRecord startTime;
Float64 duration;
};
typedef struct ExtractionInfoForCallback ExtractionInfoForCallback;
static Movie mCurrentMovie = nil;
static AUGraphPlayerRef mAUGraphUnit;
static AudioUnit mPlayerUnit, mEffectUnit;
static CFRunLoopSourceRef mRunLoopRef;
static Boolean mStopPreview;
static Boolean mUseEffectAU;
static TimeRecord *mStartTimePtr;
static TimeRecord mStartTime;
#pragma mark ----- Constants -----
// number of slices we try to keep in the play queue
const UInt32 kNumSlices = 30;
// Maximum size, in frames, of the MovieAudioExtractionFillBuffer calls
const UInt32 kMaxExtractionPacketCount = 4096;
// flags used to update our UI (play button)
const Boolean kExtractionStarted = false;
const Boolean kExtractionStopped = true;
#ifndef fieldOffset
#define fieldOffset(type, field) ((size_t) &((type *) 0)->field)
#endif
#pragma mark ----- Prototypes -----
static const void *MyInfoRetainCallBack (const void *info);
static void MyInfoReleaseCallBack (const void *info);
static void MyRunLoopPerformCallBack (void *info);
static void MyRunLoopScheduleCallBack (void *info,
CFRunLoopRef rl,
CFStringRef mode);
static OSStatus ExtractSliceAndScheduleToPlay(MovieAudioExtractionRef extraction,
AudioStreamBasicDescription asbd,
AudioUnit playerUnit,
ScheduledAudioSlice* slice,
SInt64 *ioNumSamples,
Boolean *extractionComplete);
static UInt32 PreviewBufferScheduleSlices(ScheduledAudioSlice *sliceList,
UInt32 numSlices,
MovieAudioExtractionRef extraction,
AudioStreamBasicDescription asbd,
Float64 * ioSampleTimeStamp,
SInt64* ioSamplesRemaining,
Boolean * outExtractionComplete);
static OSStatus PreviewBufferAllocate(ScheduledAudioSlice *sliceList,
UInt32 numSlices,
AudioStreamBasicDescription asbd,
void * condLock);
static void PreviewBufferDeallocate(ScheduledAudioSlice *sliceList, UInt32 numSlices);
static void PreviewCompleted();
static void PreviewOnMainThreadCallBack(ExtractionInfoForCallback *info);
static void StartPreview();
static OSStatus GetMovieExtractionParameters( Movie theMovie,
AudioChannelLayout **layout,
UInt32 *layoutSize,
AudioStreamBasicDescription *asbd,
TimeRecord *startTime,
Float64 *duration,
Boolean *allDiscrete);
#pragma mark ----- Run Loop callbacks -----
// The callback used to add a retain for the source on
// the info pointer for the life of the source, and may be
// used for temporary references the source needs to take.
// This callback returns the actual info pointer to store in
// the source, almost always just the pointer passed as the
// parameter.
static const void *MyInfoRetainCallBack (const void *info)
{
return (info);
}
// The callback used to remove a retain previously
// added for the source on the info pointer.
static void MyInfoReleaseCallBack (const void *info)
{
free((void *)info);
}
// This callback is called when the source has been marked "signaled" with the
// CFRunLoopSourceSignal() function, and should do whatever
// handling is required for the source.
static void MyRunLoopPerformCallBack (void *info)
{
PreviewOnMainThreadCallBack((ExtractionInfoForCallback *)info);
}
// This callback is called whenever the source is added to a run loop mode.
static void MyRunLoopScheduleCallBack ( void *info,
CFRunLoopRef rl,
CFStringRef mode)
{
PreviewOnMainThreadCallBack(info);
}
#pragma mark ----- AUScheduledSoundPlayer -----
// Extract a slice of audio and schedule it for play in the AUScheduledSoundPlayer.
// The ScheduledAudioSlice parameter contains the AudioBufferList to fill with
// extracted audio data (which is always deinterleaved, since we're passing
// it along to an AUGraph). 'playerUnit' specifies an AUScheduledSoundPlayer
// instance to which the filled slice is queued.
static OSStatus ExtractSliceAndScheduleToPlay(MovieAudioExtractionRef extraction,
AudioStreamBasicDescription asbd,
AudioUnit playerUnit,
ScheduledAudioSlice* slice,
SInt64 *ioNumSamples,
Boolean *extractionComplete)
{
OSStatus err = noErr;
UInt32 bufIndex;
UInt32 flags;
UInt32 numFrames = *ioNumSamples;
// Make sure the buffer list has all the buffer sizes reset.
for (bufIndex = 0; bufIndex < slice->mBufferList->mNumberBuffers; bufIndex++)
{
slice->mBufferList->mBuffers[bufIndex].mDataByteSize = *ioNumSamples * asbd.mBytesPerPacket;
}
// Extract into the slice's bufferlist
err = MovieAudioExtractionFillBuffer(extraction, &numFrames, slice->mBufferList, &flags);
*extractionComplete = (flags & kQTMovieAudioExtractionComplete);
if (!err && (numFrames != 0))
{
// Fill in the slice frame count
slice->mNumberFrames = numFrames;
err = AudioUnitSetProperty(playerUnit,
kAudioUnitProperty_ScheduleAudioSlice,
kAudioUnitScope_Global,
0,
slice,
sizeof(ScheduledAudioSlice));
require(err == noErr, bail);
}
bail:
if (err)
numFrames = 0;
*ioNumSamples = numFrames;
return err;
}
// Fill and schedule the audio slice buffers.
// Return the number of slices free once we're done.
static UInt32 PreviewBufferScheduleSlices(ScheduledAudioSlice *sliceList,
UInt32 numSlices,
MovieAudioExtractionRef extraction,
AudioStreamBasicDescription asbd,
Float64 * ioSampleTimeStamp,
SInt64* ioSamplesRemaining,
Boolean * outExtractionComplete)
{
UInt32 sliceNumber;
UInt32 numSlicesFree = 0;
OSStatus err;
// Iterate through our slice list.
// For each completed (or never used) slice, fill and schedule it.
for (sliceNumber = 0; sliceNumber < numSlices ; sliceNumber++)
{
if (sliceList[sliceNumber].mFlags & kScheduledAudioSliceFlag_Complete)
{
// Count this slice as free until we fill it up
numSlicesFree++;
// If there are any samples left to extract...
if (*ioSamplesRemaining == 0)
*outExtractionComplete = true;
if (!*outExtractionComplete)
{
// We will read numSamplesThisSlice number of samples
SInt64 numSamplesThisSlice = *ioSamplesRemaining;
if ((numSamplesThisSlice > kMaxExtractionPacketCount) || (numSamplesThisSlice == -1))
numSamplesThisSlice = kMaxExtractionPacketCount;
sliceList[sliceNumber].mTimeStamp.mSampleTime = *ioSampleTimeStamp;
err = ExtractSliceAndScheduleToPlay(extraction,
asbd,
mPlayerUnit,
&sliceList[sliceNumber],
&numSamplesThisSlice,
outExtractionComplete);
if (!err && (numSamplesThisSlice > 0))
{
numSlicesFree--;
}
else
{
sliceList[sliceNumber].mFlags = kScheduledAudioSliceFlag_Complete;
}
// Whether there was an error or not, numSamplesThisSlice is valid
*ioSampleTimeStamp += numSamplesThisSlice;
if (*ioSamplesRemaining != -1)
*ioSamplesRemaining -= numSamplesThisSlice;
}
}
}
return (numSlicesFree);
}
// Allocate and initialize audio slice buffers for the AUScheduledSoundPlayer
static OSStatus PreviewBufferAllocate(ScheduledAudioSlice *sliceList,
UInt32 numSlices,
AudioStreamBasicDescription asbd,
void *condLock)
{
UInt32 sliceNumber;
OSStatus err = noErr;
bzero(sliceList, numSlices * sizeof(ScheduledAudioSlice));
for (sliceNumber = 0; sliceNumber < numSlices ; sliceNumber++)
{
AudioBufferList *bufList = nil;
UInt32 bufNumber = 0;
UInt32 bufSize, listSize;
UInt32 mallocSize;
// Accumulate the size of all the memory objects we need for this slice.
// Then allocate it and parcel it out.
// Make sure all sizes are rounded up to Altivec boundaries;
listSize = fieldOffset(AudioBufferList, mBuffers[asbd.mChannelsPerFrame]);
listSize = ((listSize + 15) / 16) * 16; // round to Altivec boundary
mallocSize = listSize;
bufSize = kMaxExtractionPacketCount * asbd.mBytesPerPacket;
bufSize = ((bufSize + 15) / 16) * 16; // round to Altivec boundary
mallocSize += (bufSize * asbd.mChannelsPerFrame);
bufList = (AudioBufferList*) calloc(1, mallocSize);
if (bufList == nil)
{
err = memFullErr;
goto bail;
}
bufList->mNumberBuffers = asbd.mChannelsPerFrame;
for (bufNumber = 0; bufNumber < bufList->mNumberBuffers; bufNumber++)
{
bufList->mBuffers[bufNumber].mNumberChannels = 1;
bufList->mBuffers[bufNumber].mData = (char *) bufList + listSize + (bufNumber * bufSize);
bufList->mBuffers[bufNumber].mDataByteSize = bufSize;
}
sliceList[sliceNumber].mBufferList = bufList;
sliceList[sliceNumber].mNumberFrames = kMaxExtractionPacketCount;
sliceList[sliceNumber].mTimeStamp.mFlags = kAudioTimeStampSampleTimeValid;
sliceList[sliceNumber].mCompletionProcUserData = condLock;
sliceList[sliceNumber].mCompletionProc = (ScheduledAudioSliceCompletionProc) (nil);
sliceList[sliceNumber].mFlags = kScheduledAudioSliceFlag_Complete;
sliceList[sliceNumber].mReserved = 0;
}
bail:
return (err);
}
// Free the audio slice buffers
static void PreviewBufferDeallocate(ScheduledAudioSlice *sliceList, UInt32 numSlices)
{
UInt32 sliceNumber;
for (sliceNumber = 0; sliceNumber < numSlices ; sliceNumber++)
{
if (sliceList[sliceNumber].mBufferList != nil)
{
free (sliceList[sliceNumber].mBufferList);
}
}
}
static void PreviewCompleted()
{
// Stop and dispose the playback AudioUnit Graph
CloseAUGraphPlayer(mAUGraphUnit);
mAUGraphUnit = nil;
// Set the Preview button back to its original state
// Send custom event to our window to tell it status
// of extraction so we can update our UI (button) elements
SendExtractionStatusEventToWindow(kExtractionStopped);
}
// This callback is scheduled on the main thread.
// In order to keep from locking up the UI, schedules what it can, and then reschedules itself.
static void PreviewOnMainThreadCallBack(ExtractionInfoForCallback *info)
{
AudioStreamBasicDescription asbd = info->asbd;
AudioChannelLayout *layout = info->layout;
UInt32 layoutSize = info->layoutSize;
TimeRecord startTime = info->startTime;
SInt64 samplesRemaining = info->samplesRemaining;
Boolean discrete = info->discrete;
Boolean playerUnitStarted = info->playerUnitStarted;
Float64 sampleTimeStamp = info->sampleTimeStamp;
ScheduledAudioSlice *sliceList = info->sliceList;
MovieAudioExtractionRef extraction = info->extractionSessionRef;
OSStatus err = noErr;
//-----------------------------------------------------------
// Prepare for extraction if this is the first entry
if (extraction == NULL)
{
// Open a session, configure audio format
err = PrepareMovieForExtraction(mCurrentMovie,
&extraction,
discrete,
asbd,
&layout,
&layoutSize,
startTime);
if (layout)
{
free(layout);
}
require(err == noErr, bail);
// Save for future entries
info->extractionSessionRef = extraction;
}
// Prepare audio "slice" list if this is the first time through
if (sliceList == nil)
{
sliceList = (ScheduledAudioSlice *) calloc(kNumSlices, sizeof(ScheduledAudioSlice));
if (sliceList == nil)
{
err = memFullErr;
goto bail;
}
err = PreviewBufferAllocate(sliceList,
kNumSlices,
asbd,
(void *)nil);
require(err == noErr, bail);
info->sliceList = sliceList;
}
//-----------------------------------------------------------
UInt32 numSlicesFree;
Boolean extractionComplete = false;
if (!mStopPreview)
{
// Iterate through our slice list.
// For each completed (or never used) slice, fill and schedule it.
numSlicesFree = PreviewBufferScheduleSlices (sliceList,
kNumSlices,
extraction,
asbd,
&sampleTimeStamp,
&samplesRemaining,
&extractionComplete);
}
if (!playerUnitStarted)
{
// Start the AUGraph player
err = StartAUGraphPlayer(mAUGraphUnit);
require(err == noErr, bail);
info->playerUnitStarted = true;
}
// Save updated state for the next time through this method
info->samplesRemaining = samplesRemaining;
info->sampleTimeStamp = sampleTimeStamp;
// Set the complete flag if we could not queue anything, for what ever reason
// (ie, we finished playing everything or we never queued anything).
extractionComplete = (numSlicesFree == kNumSlices);
bail:
// check for:
// - extraction errors
// - extraction completed normally
// - extraction was stopped by user
if (err || extractionComplete || mStopPreview)
{
if (extraction)
{
MovieAudioExtractionEnd(extraction);
}
StopAUGraphPlayer(mAUGraphUnit);
if (sliceList != nil)
{
PreviewBufferDeallocate(sliceList,kNumSlices);
free (sliceList);
}
if (mRunLoopRef != NULL)
{
CFRunLoopSourceInvalidate (mRunLoopRef);
CFRelease(mRunLoopRef);
mRunLoopRef = NULL;
}
// Call the completion routine to reset the UI
PreviewCompleted();
}
else
{
// Reschedule to perform this routine again on the next run loop cycle
// Use CFRunLoopSource to schedule playing of slices on the main thread
CFRunLoopSourceContext myContext;
myContext.version = 0;
myContext.info = info;
myContext.retain = &MyInfoRetainCallBack;
myContext.release = &MyInfoReleaseCallBack;
myContext.copyDescription = nil;
myContext.equal = nil;
myContext.hash = nil;
myContext.schedule = &MyRunLoopScheduleCallBack;
myContext.cancel = nil;
myContext.perform = &MyRunLoopPerformCallBack;
// do CFRunLoopSource initialization if not already done
if (mRunLoopRef == NULL)
{
// Create a CFRunLoopSource object.
mRunLoopRef = CFRunLoopSourceCreate (kCFAllocatorDefault,
0,
&myContext);
if (mRunLoopRef)
{
// add the CFRunLoopSource object to a run loop
CFRunLoopAddSource (CFRunLoopGetCurrent(),
mRunLoopRef,
kCFRunLoopCommonModes);
}
}
else
{
// Signal the CFRunLoopSource, marking it as ready to fire
CFRunLoopSourceSignal (mRunLoopRef);
}
}
}
#pragma mark ----- Audio Extraction -----
// Method invoked by the Preview Start button
void DoStartMoviePreview(Movie inMovie, TimeRecord *inMovieStartTime, Boolean inUseEffect)
{
// if we are given a different movie let's dispose the current one
if (mCurrentMovie && (mCurrentMovie != inMovie))
{
DisposeMovie(mCurrentMovie);
mCurrentMovie = NULL;
}
mCurrentMovie = inMovie;
// add a Core Audio Effect Audio Unit to our playback?
mUseEffectAU = inUseEffect;
// If a movie start time is specified we'll use it, otherwise
// use a default start time of 0
mStartTimePtr = nil;
if (inMovieStartTime != nil)
{
memcpy(&mStartTime, inMovieStartTime, sizeof(TimeRecord));
mStartTimePtr = &mStartTime;
}
// Extract and play audio (asynchronously)
StartPreview();
// Send custom event to our window to tell it status
// of extraction so we can update our UI (button) elements.
SendExtractionStatusEventToWindow(kExtractionStarted);
}
// Start a preview playback
static void StartPreview()
{
OSStatus err = noErr;
// when this is set true, preview stops on the next cycle
mStopPreview = false;
// initialize our run loop source reference value
// this is used for our rendering async callbacks
mRunLoopRef = NULL;
AudioStreamBasicDescription asbd;
AudioChannelLayout *layout = nil;
UInt32 layoutSize = 0;
Boolean discrete = false;
Float64 duration = 0;
TimeRecord startTime;
// Get default values for extraction layout, layoutsize,
// extraction startTime, duration and whether we need to
// extract in the "All Channels Discrete" mode
err = GetMovieExtractionParameters(mCurrentMovie,
&layout,
&layoutSize,
&asbd,
&startTime,
&duration,
&discrete);
require(err == noErr, bail);
// override default movie start time if another time value was specified
if (mStartTimePtr != nil)
{
// use the specified start time
memcpy(&startTime, mStartTimePtr, sizeof(struct TimeRecord));
}
// Build an AU Graph with a scheduled sound player unit and
// an output unit for playback -- and insert an effect unit
// in the chain if specified by the user
if (mUseEffectAU)
{
err = BuildAUGraphPlayerWithEffect(layout, layoutSize, &asbd, &mAUGraphUnit, &mPlayerUnit, &mEffectUnit);
}
else
{
err = BuildAUGraphPlayer(layout, layoutSize, &asbd, &mAUGraphUnit, &mPlayerUnit);
}
require(err == noErr, bail);
// refCon information that will be sent to the preview thread/timer
ExtractionInfoForCallback *info = nil;
info = malloc(sizeof (struct ExtractionInfoForCallback));
require(info != nil, bail);
info->asbd = asbd;
info->layout = layout;
info->layoutSize = layoutSize;
info->startTime = startTime;
info->duration = duration;
info->extractionSessionRef = NULL;
info->discrete = false;
info->sliceList = nil;
info->playerUnitStarted = false;
info->samplesRemaining = (duration > 0) ? (duration * asbd.mSampleRate) : -1;
info->sampleTimeStamp = 0;
// for now do all on main thread...
PreviewOnMainThreadCallBack(info);
bail:
if (err)
{
if (layout)
{
free(layout);
}
}
}
// Method invoked by the Preview Stop button
void DoStopMoviePreview()
{
// Set the stop flag. The rest of the cleanup will occur in PreviewCompleted.
mStopPreview = true;
}
// Fill in all the parameters necessary to configure an audio extraction
// from the panel UI and cached values.
static OSStatus GetMovieExtractionParameters(
Movie theMovie,
AudioChannelLayout **layout,
UInt32 *layoutSize,
AudioStreamBasicDescription *asbd,
TimeRecord *startTime,
Float64 *duration,
Boolean *allDiscrete)
{
OSStatus err = noErr;
AudioChannelLayout *summaryLayout;
// Set all the parameters to safe values
// in the event that this method has to bail on an error
*layout = nil;
*layoutSize = 0;
*duration = 0; // 0 indicates that the entire movie is to be extracted
*allDiscrete = false; // true means do export of all audio channels without mixing
// Start Time
// by default we'll start at time 0
TimeRecord tr;
tr.value.hi = 0;
tr.value.lo = 0;
tr.scale = GetMovieTimeScale(theMovie);
tr.base = GetMovieTimeBase(theMovie);
memcpy(startTime, &tr, sizeof(struct TimeRecord));
// Duration
*duration = GetMovieExtractionDuration(theMovie) - GetMovieTime (theMovie, startTime);
// ASBD
err = GetDefaultExtractionLayout(theMovie, nil, &summaryLayout, asbd);
// Return a copy of the cached extraction layout, which should always be current
*layoutSize = fieldOffset(AudioChannelLayout, mChannelDescriptions[summaryLayout->mNumberChannelDescriptions]);
*layout = (AudioChannelLayout*) calloc(1, *layoutSize);
if (*layout == nil)
{
err = memFullErr;
goto bail;
}
memcpy(*layout, summaryLayout, *layoutSize);
free (summaryLayout);
bail:
if (err)
{
if (*layout)
{
free(*layout);
}
}
return (err);
}
</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/listing3.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/listing3.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/listing3.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>