Apple

- (OSStatus) getGeneratedSamples:(AudioBufferList *) ioData frames:(UInt32) numFrames

{

OSStatus result = [self.delegate generateSamples:ioData frames:numFrames];

if (_isRecording) {

checkError(ExtAudioFileWriteAsync(_recFileRef,

numFrames,

ioData),

"ExtAudioFileWriteAsync failed", false);

}

return result;

}

And it gives an EXC_BAD_ACCESS like this:

* thread #11: tid = 0x2d03, 0x028e2f77 libsystem_sim_c.dylib`memcpy$VARIANT$sse42 + 154, stop reason = EXC_BAD_ACCESS (code=2, address=0x0)

frame #0: 0x028e2f77 libsystem_sim_c.dylib`memcpy$VARIANT$sse42 + 154

frame #1: 0x002e2cad AudioToolbox`AudioRingBuffer::Store(AudioBufferList const*, unsigned long, long long) + 765

frame #2: 0x003ab516 AudioToolbox`ExtAudioFile::WriteFramesAsync(unsigned long, AudioBufferList const*) + 566

frame #3: 0x003ac5f4 AudioToolbox`ExtAudioFileWriteAsync + 116

frame #4: 0x00054f87 Cellular`-[TKCoreAudioBridge getGeneratedSamples:frames:] + 279 at TKCoreAudioBridge.m:221

Then I tried to work with just one channel, like this:

if (_isRecording) {

AudioBuffer *leftAudioBuffer = &ioData->mBuffers[0];

AudioBuffer *rightAudioBuffer = &ioData->mBuffers[1];

SInt32 *leftData = (SInt32 *) leftAudioBuffer->mData;

SInt32 *rightData = (SInt32 *) rightAudioBuffer->mData;

AudioBufferList abl;

abl.mNumberBuffers = 1;

abl.mBuffers[0] = *leftAudioBuffer;

checkError(ExtAudioFileWriteAsync(_recFileRef,

numFrames,

&abl),

"ExtAudioFileWriteAsync failed", false);

}

And, this time, it works (though the left channel of the file is filled with static because the ASBD expects two buffers.)

If I then try this:

if (_isRecording) {

AudioBuffer *leftAudioBuffer = &ioData->mBuffers[0];

AudioBuffer *rightAudioBuffer = &ioData->mBuffers[1];

SInt32 *leftData = (SInt32 *) leftAudioBuffer->mData;

SInt32 *rightData = (SInt32 *) rightAudioBuffer->mData;

AudioBufferList abl;

abl.mNumberBuffers = 2;

abl.mBuffers[0] = *leftAudioBuffer;

abl.mBuffers[1] = *rightAudioBuffer;

checkError(ExtAudioFileWriteAsync(_recFileRef,

numFrames,

ioData),

"ExtAudioFileWriteAsync failed", false);

}

I get the same EXC_BAD_ACCESS error.

How should I be writing stereo data to the file using that ASBD? Should I also be changing my RemoteIO's ASBD too? Is this something to do with interleaving?

Thanks