EXC_BAD_ACCESS de ExtAudioFileWriteAsync

Question

J'utilise une unité audio pour enregistrer notre voix. Dans ma fonction de rappel, j'obtiens des données dans AudioBufferList. Je dois stocker ce tampon dans un fichier.

Problème est; Lorsque j'essaie de stocker le tampon dans un fichier .caf, l'application plante. Voici le code.

AudioStreamBasicDescription audioFormat; 
audioFormat.mSampleRate   = 44100.00; 
audioFormat.mFormatID   = kAudioFormatLinearPCM; 
audioFormat.mFormatFlags  = kAudioFormatFlagsCanonical; 
audioFormat.mBytesPerPacket  = 2; 
audioFormat.mFramesPerPacket = 1; 
audioFormat.mBytesPerFrame  = 2; 
audioFormat.mChannelsPerFrame = 1; 
audioFormat.mBitsPerChannel  = 16; 
audioFormat.mReserved   = 0; 
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init]; 
NSString *documentsDirectory = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0]; 
if(![[NSFileManager defaultManager] fileExistsAtPath:documentsDirectory]) 
    [[NSFileManager defaultManager] createDirectoryAtPath:documentsDirectory withIntermediateDirectories:YES attributes:nil error:nil]; 
NSString *path = [documentsDirectory stringByAppendingPathComponent:@"audio.caf"]; 
if(![[NSFileManager defaultManager] fileExistsAtPath:path]) 
    NSLog(@"file not exist."); 
NSLog(@"Path : %@", path); 
THIS->url = [NSURL fileURLWithPath:[path retain]]; 
err = ExtAudioFileCreateWithURL((CFURLRef)THIS->url, kAudioFileCAFType, &audioFormat, NULL, kAudioFileFlags_EraseFile, &THIS->fOutputAudioFile); 
if(err != noErr){ 
    printf("create with url: error %d\n", (int)err); 
} 
THIS->state = 2; 
err = ExtAudioFileSetProperty(THIS->fOutputAudioFile, kExtAudioFileProperty_ClientDataFormat, (UInt32)sizeof(audioFormat), &audioFormat); 
if(err != noErr){ 
    printf("file set property: error %d\n", (int)err); 
} 
err = ExtAudioFileWriteAsync(THIS->fOutputAudioFile, 0, NULL); 
if(err != noErr){ 
    printf("write async: error %d\n", (int)err); 
    return err; 
} 
[pool release]; 

err = ExtAudioFileWriteAsync(THIS->fOutputAudioFile, ioData->mNumberBuffers, ioData); 
if(err != noErr){ 
    printf("file write async: error %d\n", (int)err); 
    return err; 
} 

ERREUR:

Program received signal: “EXC_BAD_ACCESS”.
 
#0 0x30d04bb2 in memmove() 
#1 0x33ba1d1e in AudioRingBuffer::Store() 
#2 0x33c2269e in ExtAudioFile::WriteFramesAsync() 
#3 0x33c278c8 in ExtAudioFileWriteAsync() 
#4 0x00002e74 in PerformThru (inRefCon=0x14d9f0, ioActionFlags=0x2ffe77d4, inTimeStamp=0xa896fc, inBusNumber=0, inNumberFrames=256, ioData=0x14f680) at /Alex/project/ProStudio/TestAudioUnit/Classes/TestAudioUnitAppDelegate.mm:399 
#5 0x33b70896 in AUInputElement::PullInput() 
#6 0x33b794a0 in AUInputFormatConverter2::InputProc() 
#7 0x33b5560e in AudioConverterChain::CallInputProc() 
#8 0x33b5555e in AudioConverterChain::FillBufferFromInputProc() 
#9 0x33b5537c in BufferedAudioConverter::GetInputBytes() 
#10 0x33b79390 in CBRConverter::RenderOutput() 
#11 0x33b5505a in BufferedAudioConverter::FillBuffer() 
#12 0x33b55362 in BufferedAudioConverter::GetInputBytes() 
#13 0x33b79390 in CBRConverter::RenderOutput() 
#14 0x33b5505a in BufferedAudioConverter::FillBuffer() 
#15 0x33b551ae in AudioConverterChain::RenderOutput() 
#16 0x33b5505a in BufferedAudioConverter::FillBuffer() 
#17 0x33b54e2a in AudioConverterFillComplexBuffer() 
#18 0x33b78f58 in AUConverterBase::RenderBus() 
#19 0x33c08eea in AURemoteIO::RenderBus() 
#20 0x33b5666e in AUBase::DoRender() 
#21 0x33c09698 in AURemoteIO::PerformIO() 
#22 0x33c09962 in AURIOCallbackReceiver_PerformIO() 
#23 0x33c02448 in _XPerformIO() 
#24 0x33b71bea in mshMIGPerform() 
#25 0x33bd7de0 in MSHMIGDispatchMessage() 
#26 0x33c0ebae in AURemoteIO::IOThread::Entry() 
#27 0x33b4a1d8 in CAPThread::Entry() 
#28 0x30d7d88c in _pthread_start() 
#29 0x30d72a90 in thread_start()

S'il vous plaît aider quelqu'un pour résoudre ce problème.

Answer 1

J'ai trouvé la solution à ce problème;

Le problème est; Je règle l'AudioStreamBasicDescription pour l'unité audio et aussi ExtAudioFileCreateWithURL. C'était avoir un réglage différent. J'ai changé comme même. Maintenant ça fonctionne bien.

Précédent ASBD est;

audioFormat.mSampleRate  = 44100.00; 
audioFormat.mFormatID   = kAudioFormatLinearPCM; 
audioFormat.mFormatFlags  = kAudioFormatFlagsCanonical | (kAudioUnitSampleFractionBits << kLinearPCMFormatFlagsSampleFractionShift) | kAudioFormatFlagIsNonInterleaved; 
audioFormat.mChannelsPerFrame = 2; 
audioFormat.mFramesPerPacket = 1; 
audioFormat.mBitsPerChannel = 8 * sizeof(AudioUnitSampleType); 
audioFormat.mBytesPerPacket = sizeof(AudioUnitSampleType); 
audioFormat.mBytesPerFrame  = sizeof(AudioUnitSampleType);; 
audioFormat.mReserved   = 0; 

maintenant j'utilise ASBD suivant;

AudioStreamBasicDescription audioFormat; 
audioFormat.mSampleRate   = 44100.00; 
audioFormat.mFormatID   = kAudioFormatLinearPCM; 
audioFormat.mFormatFlags  = kAudioFormatFlagIsSignedInteger | kAudioFormatFlagIsPacked; 
audioFormat.mFramesPerPacket = 1; 
audioFormat.mChannelsPerFrame = 1; 
audioFormat.mBitsPerChannel  = 16; 
audioFormat.mBytesPerPacket  = 2; 
audioFormat.mBytesPerFrame  = 2; 
audioFormat.mReserved   = 0;