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How can I processing on the AudioQueue callback AudioQueueOutputCallback for FFT . Just like this func static void audioQueueOutpuCallBack(void *input, AudioQueueRef inQueue, AudioQueueBufferRef outQueueBuffer) {    SYAudioQueue *aq = (__bridge SYAudioQueue *)input;   dispatch_semaphore_wait(aq-m_mutex, DISPATCH_TIME_FOREVER);   [aq enterQueue:inQueue withBuffer:outQueueBuffer];   dispatch_semaphore_signal(aq-m_mutex); } I know that AVAudioEngine can be processing for FFT under the AVAudioPCMBuffer . or How can I convert AudioQueueBufferRef to AVAudioPCMBuffer
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