VTDecompressionOutputMultiImageCallback

Declaration

typealias VTDecompressionOutputMultiImageCallback = (UnsafeMutableRawPointer?, UnsafeMutableRawPointer?, OSStatus, VTDecodeInfoFlags, __CMTaggedBufferGroup?, CMTime, CMTime) -> Void

Parameters

• decompressionOutputMultiImageRefCon:

  The callback’s reference value, copied from the outputMultiImageRefcon argument passed to Vtdecompressionsessionsetmultiimagecallback.

• sourceFrameRefCon:

  The frame’s reference value, copied from the sourceFrameRefCon argument passed to Vtdecompressionsessiondecodeframe(_:samplebuffer:flags:framerefcon:infoflagsout:).

• status:

  A value of noErr if decompression succeeds or an error code if decompression fails.

• infoFlags:

  Contains information about the decode operation:

  • An Asynchronous flag indicates the decode ran asynchronously.

  • A Framedropped flag indicates the session dropped a frame.

  • An Imagebuffermodifiable flag indicates that you can safely modify the image buffer.

• taggedBufferGroup:

  Contains the decompressed frame’s multiple images, if decompression was successful; otherwise, NULL.

• presentationTimeStamp:

  The frame’s presentation timestamp, which the system determines by calling Cmsamplebuffergetoutputpresentationtimestamp(_:); otherwise, Invalid if the timestamp isn’t available.

• presentationDuration:

  The frame’s presentation duration, which the system determines by calling Cmsamplebuffergetoutputduration(_:); otherwise, Invalid if the duration isn’t available.

Discussion

The system doesn’t guarantee that it calls this function in display order.