[iphone]How to get 2 buffers in AudioBufferList

I set the audio stream like this:
m_InputDataASBDFormat.mFormatID = kAudioFormatLinearPCM;
m_InputDataASBDFormat.mFormatFlags = kAudioFormatFlagIsSignedInteger | kAudioFormatFlagIsPacked;
m_InputDataASBDFormat.mSampleRate = sampleRate;
m_InputDataASBDFormat.mBitsPerChannel = 16;
m_InputDataASBDFormat.mChannelsPerFrame = 2;
m_InputDataASBDFormat.mFramesPerPacket = 1;
m_InputDataASBDFormat.mBytesPerFrame = 2;
m_InputDataASBDFormat.mBytesPerPacket = m_InputDataASBDFormat.mBytesPerFrame;
but in the callback of the kAudioUnitProperty_SetRenderCallback:
renderProc(void *inRefCon,
AudioUnitRenderActionFlags *ioActionFlags,
const AudioTimeStamp *inTimeStamp,
UInt32 inBusNumber,
UInt32 inNumberFrames,
AudioBufferList *ioData)
here the ioData->mNumberBuffers is always 1 , and i need two channel buffers , what's the issue?

But here i have set the m_InputDataASBDFormat.mChannelsPerFrame = 2 , so i think i should have 2 channel buffers , isn't it ?

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[iphone]How to get 2 buffers in AudioBufferList

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