AudioQueueInputCallback

Declaration

typealias AudioQueueInputCallback = (UnsafeMutableRawPointer?, AudioQueueRef, AudioQueueBufferRef, UnsafePointer<AudioTimeStamp>, UInt32, UnsafePointer<AudioStreamPacketDescription>?) -> Void

Parameters

• inUserData:

  The custom data you’ve specified in the inUserData parameter of the Audioqueuenewinput(_:_:_:_:_:_:_:) function. Typically, this includes format and state information for the audio queue.

• inAQ:

  The recording audio queue that invoked the callback.

• inBuffer:

  An audio queue buffer, newly filled by the recording audio queue, containing the new audio data your callback needs to write.

• inStartTime:

  The sample time for the start of the audio queue buffer. This parameter is not used in basic recording.

• inNumberPacketDescriptions:

  The number of packets of audio data sent to the callback in the inBuffer parameter. When recording in a constant bit rate (CBR) format, the audio queue sets this parameter to NULL.

• inPacketDescs:

  For compressed formats that require packet descriptions, the set of packet descriptions produced by the encoder for audio data in the inBuffer parameter. When recording in a CBR format, the audio queue sets this parameter to NULL.

Discussion

If you name your callback function MyAudioQueueInputCallback, you would declare it like this:

Discussion

You specify a recording audio queue callback when calling the AudioQueueNewInput(_:_:_:_:_:_:_:) function. The callback is invoked each time its recording audio queue has filled an audio queue buffer with fresh audio data. Typically, your callback writes the data to a file or other buffer, and then reenqueues the audio queue buffer to receive more data.

See Also

Callbacks

• AudioQueueOutputCallback
• AudioQueuePropertyListenerProc