EXC_BAD_ACCESS z ExtAudioFileWriteAsync

Question

Używam urządzenia audio do nagrywania głosu. W mojej funkcji wywołania zwrotnego otrzymuję dane w AudioBufferList. Muszę przechowywać ten bufor w pliku.

Problem dotyczy; Kiedy próbuję przechowywać bufor w pliku .caf, aplikacja ulega awarii. Poniżej znajduje się kod.

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; 
} 

BŁĄD:

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()

Proszę o pomoc kogoś, aby rozwiązać ten problem.

Answer 1

Mam rozwiązanie tego problemu;

Problem jest; Ustawiam AudioStreamBasicDescription dla jednostki audio, a także ExtAudioFileCreateWithURL. Miało trochę inne ustawienie. Zmieniłem się tak samo. Teraz działa dobrze.

Poprzedni ASBD;

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; 

teraz używam następujące ASBD;

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;