ExtAudioFileGetProperty fails with 0xffffffda if file opened with AudioFileOpenURL and ExtAudioFileWrapAudioFileID

Hi there.

I have to load sound data from a buffer instead of a file, so I looked into AudioFileOpenWithCallbacks. All went well, I converted from an AudioFileID handle to an ExtAudioFileRef, but then it fails when I request the number of frames from that handle, with ExtAudioFileGetProperty.

For some reason, it does not fail if I open the file directly with ExtAudioFileOpenURL.

I wrote this snippet of code to demonstrate my problem.

    CFURLRef fileURL = nil;
    NSString* nsPath = [CDUtilities fullPathFromRelativePath:[NSString stringWithUTF8String:FilePath.c_str()]];
    if (nsPath)
    {
        fileURL = (CFURLRef)[[NSURL fileURLWithPath:nsPath] retain];
    }

#if 0
    status = AudioFileOpenURL (fileURL, kAudioFileReadPermission, kAudioFileMP3Type, &AudioFileHandle );
    ExtAudioFileWrapAudioFileID ( AudioFileHandle, false, &ExtAudioFileHandle );

    // Close the AudioFile handle. It's no longer needed
    AudioFileClose ( AudioFileHandle );
    AudioFileHandle = nullptr;

#else
    status = ExtAudioFileOpenURL ( fileURL, &ExtAudioFileHandle );
#endif

    // Get the audio data format
    UInt32 PropertySize = sizeof ( InputDataFormat );
    status = ExtAudioFileGetProperty ( ExtAudioFileHandle, kExtAudioFileProperty_FileDataFormat, &PropertySize, &InputDataFormat);
    if (status != noErr)
    {
        DecodeResult = false;
        goto function_exit;
    }

    if ( InputDataFormat.mChannelsPerFrame > 2 )
    {
        DecodeResult = false;
        goto function_exit;
    }

    // Set the client format to 16 bit signed integer (native-endian) data
    // Maintain the channel count and sample rate of the original source format
    OutputDataFormat.mSampleRate = InputDataFormat.mSampleRate;
    OutputDataFormat.mChannelsPerFrame = InputDataFormat.mChannelsPerFrame;

    OutputDataFormat.mFormatID = kAudioFormatLinearPCM;
    OutputDataFormat.mBytesPerPacket = 2 * InputDataFormat.mChannelsPerFrame;
    OutputDataFormat.mFramesPerPacket = 1;
    OutputDataFormat.mBytesPerFrame = 2 * InputDataFormat.mChannelsPerFrame;
    OutputDataFormat.mBitsPerChannel = 16;
    OutputDataFormat.mFormatFlags = kAudioFormatFlagsNativeEndian | kAudioFormatFlagIsPacked | kAudioFormatFlagIsSignedInteger;

    // Set the desired client (output) data format
    status = ExtAudioFileSetProperty ( ExtAudioFileHandle, kExtAudioFileProperty_ClientDataFormat, sizeof ( OutputDataFormat ), &OutputDataFormat );
    if (status != noErr)
    {
        DecodeResult = false;
        goto function_exit;
    }

    // Get the total frame count
    PropertySize = sizeof ( FrameCount );
    status = ExtAudioFileGetProperty ( ExtAudioFileHandle, kExtAudioFileProperty_FileLengthFrames, &PropertySize, &FrameCount );
    if (status != noErr)
    {
        DecodeResult = false;
        goto function_exit;
    }

This code runs ok, but if I use the loading code from inside the #if 0, if fails on the last ExtAudioFileGetProperty with 0xffffffda. Can anyone tell me why, and how to fix it? I really need to use the callback method.

Thanks.