VTCompressionOutputCallback

Declaration

typealias VTCompressionOutputCallback = (UnsafeMutableRawPointer?, UnsafeMutableRawPointer?, OSStatus, VTEncodeInfoFlags, CMSampleBuffer?) -> Void

Parameters

• outputCallbackRefCon:

  The callback’s reference value.

• sourceFrameRefCon:

  The frame’s reference value, copied from the sourceFrameRefCon argument to Vtcompressionsessionencodeframe(_:imagebuffer:presentationtimestamp:duration:frameproperties:sourceframerefcon:infoflagsout:).

• status:

  noErr if compression was successful; an error code if compression wasn’t successful.

• infoFlags:

  Contains information about the encode operation.

  The Asynchronous bit may be set if the encode ran asynchronously.

  The Framedropped bit may be set if the frame was dropped.

• sampleBuffer:

  Contains the compressed frame if compression was successful and the frame wasn’t dropped; otherwise, NULL.

Discussion

When you create a compression session, you pass in a callback function to be called for compressed frames. This function is called in decode order (which is not necessarily the same as display order).

See Also

Callbacks

• VTCompressionOutputHandler