EXC_BAD_ACCESS on ExtAudioFileWriteAsync

Question

I have added the following code at the end of the Mic / Line In Audio Rendering Callback.

But the app keeps crashing with EXC_BAD_ACCESS on :

err = ExtAudioFileWriteAsync(mOutputAudioFile, inNumberFrames, ioData);

The rest of the code is as follows :

ExtAudioFileRef mOutputAudioFile;
    AudioFileID mAfid;
    NSLog(@"Writing output to file ....");

    NSArray *dirPaths;
    NSString *docsDir;
    dirPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    docsDir = [dirPaths objectAtIndex:0];
    NSLog(@"docDir = %@", docsDir);
    NSString *soundFilePath = [docsDir stringByAppendingPathComponent:@"sound.caf"];
    NSURL *inPath = [NSURL fileURLWithPath:soundFilePath];
    NSLog(@"Output file path is : %@", inPath);

    AudioStreamBasicDescription mStreamFormat;

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


    err = AudioFileCreateWithURL((CFURLRef)inPath, kAudioFileCAFType, &mStreamFormat, kAudioFileFlags_EraseFile, &mAfid);
    if (err != noErr) {
        NSLog(@"ERROR : Audio file could not be created !! %d", (int)err);

    }
    err = ExtAudioFileWrapAudioFileID(mAfid, true, &mOutputAudioFile);
    err = ExtAudioFileSetProperty(mOutputAudioFile, kExtAudioFileProperty_ClientDataFormat, sizeof(AudioStreamBasicDescription), &mStreamFormat);
    if (ioData) {
        err = ExtAudioFileWriteAsync(mOutputAudioFile, inNumberFrames, ioData);
        if (err != noErr) {
            NSLog(@"ERROR : Audio file could not be written !! %d", (int)err);
        }
    }
    else {

        NSLog(@"No ioData found");
    }
    NSLog(@"Done writing output to file ....");

I have tried almost everything with this. I would be extremely thankful if somebody could help me resolve it. Thanks !

UPDATE 1:

If I use ExtAudioFileWrite instead of ExtAudioFileWriteAsync, the app doesn't crash, but returns error -50 for ExtAudioFileWrite.

I still have no idea what's happening with it. Any help in this regard is much appreciated.

Thanks.

You are missing check for errors in the calls before, maybe if you check the return value you will have the needed info. Also, how are the following defined: inNumberFrames, ioData — MByD, Feb 14 '12 at 14:03
@CocoaFu There are no messages in the console. That's the sad part. It only says: [Switching to process 6191 thread 0x18203] [Switching to process 6191 thread 0x18203] Current language: auto; currently objective-c — Myxtic, Feb 14 '12 at 14:08
@BinyaminSharet - Are you talking about the return value of the callback ? — Myxtic, Feb 14 '12 at 14:11
I'm talking about `ExtAudioFileWrapAudioFileID` and the line after — MByD, Feb 14 '12 at 14:12
Btw inNumberFrames is a UINT32 var with value 512 when the app crashes. And ioData is an AudioBufferList and contains 0x8abe990 at the time of crash. — Myxtic, Feb 14 '12 at 14:14
@BinyaminSharet - So I applied the error check on err for ExtAudioFileWrapAudioFileID and ExtAudioFileSetProperty. And no error was indicated there. Please let me know if I am missing something here. Thanks so much for your help. — Myxtic, Feb 14 '12 at 14:22

score 0 · Answer 1 · answered Jul 17 '16 at 03:14

0

Check the ioData.mNumberBuffers value. For me it was set to 2 despite there being only 1 buffer in the bufferlist. This was causing the EXC_BAD_ACCESS.

answered Jul 17 '16 at 03:14

Pescolly

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score 0 · Accepted Answer · edited May 23 '17 at 12:32

0

The sample code posted in the answer here answered all my questions :

Can anybody help me in recording iPhone output sound through Audio Unit

Thanks so much everyone for your help.

edited May 23 '17 at 12:32

Community

1
1

answered Feb 20 '12 at 16:44

Myxtic

5,679
5
48
69

EXC_BAD_ACCESS on ExtAudioFileWriteAsync

2 Answers2

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