Class: AVCaptureAudioDataOutput

Inherits:
AVCaptureOutput show all

Overview

AVCaptureAudioDataOutput is a concrete sub-class of AVCaptureOutput that you use, via its delegate, to process audio sample buffers from the audio being captured.

Instance Attribute Summary (collapse)

Attributes inherited from AVCaptureOutput

#connections

Instance Method Summary (collapse)

Methods inherited from AVCaptureOutput

#connectionWithMediaType:, #transformedMetadataObjectForMetadataObject:connection:

Methods inherited from NSObject

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Constructor Details

This class inherits a constructor from NSObject

Dynamic Method Handling

This class handles dynamic methods through the method_missing method in the class NSObject

Instance Attribute Details

- (dispatch_queue_t) sampleBufferCallbackQueue (readonly)

The queue on which delegate callbacks are invoked (read-only)

Returns:

  • (dispatch_queue_t)

- (Object) sampleBufferDelegate (readonly)

The capture object’s delegate. (read-only) You use the delegate to manage incoming data.

Returns:

Instance Method Details

- (Object) setSampleBufferDelegate(sampleBufferDelegate, queue:sampleBufferCallbackQueue)

Sets the delegate that will accept captured buffers and dispatch queue on which the delegate will be called. When a new audio sample buffer is captured it is vended to the sample buffer delegate using the captureOutput:didOutputSampleBuffer:fromConnection: delegate method. All delegate methods are called on the specified dispatch queue.If the queue is blocked when new samples are captured, those samples will be automatically dropped when they become sufficiently late. This allows you to process existing samples on the same queue without having to manage the potential memory usage increases that would otherwise occur when that processing is unable to keep up with the rate of incoming samples.If you need to minimize the chances of samples being dropped, you should specify a queue on which a sufficiently small amount of processing is being done outside of receiving sample buffers. However, you migrate extra processing to another queue, you are responsible for ensuring that memory usage does not grow without bound from samples that have not been processed.

Parameters:

  • sampleBufferDelegate (Object) —

    An object conforming to the AVCaptureAudioDataOutputSampleBufferDelegate protocol that will receive sample buffers after they are captured..

  • sampleBufferCallbackQueue (dispatch_queue_t) —

    You must pass a serial dispatch to guarantee that audio samples will be delivered in order.The value may not be NULL, except when setting the sampleBufferDelegate to nil.

Returns: