Function

CMVideoFormatDescriptionCopyAsBigEndianImageDescriptionBlockBuffer

Copies the contents of a CMVideoFormatDescription to a CMBlockBuffer in big-endian byte ordering.

Declaration

OSStatus CMVideoFormatDescriptionCopyAsBigEndianImageDescriptionBlockBuffer(CFAllocatorRef allocator, CMVideoFormatDescriptionRef videoFormatDescription, CFStringEncoding stringEncoding, CMImageDescriptionFlavor flavor, CMBlockBufferRef  _Nullable *blockBufferOut);

Parameters

allocator

Allocator to use for allocating the CMBlockBuffer object. May be NULL.

videoFormatDescription

The CMVideoFormatDescription to be copied.

imageDescriptionStringEncoding

Pass CFStringGetSystemEncoding or GetApplicationTextEncoding.

imageDescriptionFlavor

kCMImageDescriptionFlavor constant or NULL for QuickTimeMovie flavor.

imageDescriptionBlockBufferOut

Receives a new CMBlockBuffer containing ImageDescription data structure in big-endian byte ordering.

Discussion

On return, the caller owns the returned CMBlockBuffer, and must release it when done with it.

See Also

Video-Specific Functions

CMVideoFormatDescriptionCreate

Creates a format description for a video media stream.

CMVideoFormatDescriptionCreateForImageBuffer

Creates a format description for a video media stream contained in CVImageBuffers of the type provided.

CMVideoFormatDescriptionGetCleanAperture

Returns the clean aperture.

CMVideoFormatDescriptionGetDimensions

Returns the video dimensions (in encoded pixels).

CMVideoFormatDescriptionGetExtensionKeysCommonWithImageBuffers

Returns an array of the keys that are used both as CMVideoFormatDescription extensions and CVImageBuffer attachments and attributes.

CMVideoFormatDescriptionGetPresentationDimensions

Returns the dimensions, adjusted to take pixel aspect ratio and/or clean aperture into account.

CMVideoFormatDescriptionMatchesImageBuffer

Checks to see if a given format description matches an image buffer.

CMVideoFormatDescriptionCreateFromH264ParameterSets

Creates a format description for a video media stream described by H.264 parameter set NAL units.

CMVideoFormatDescriptionGetH264ParameterSetAtIndex

Returns a parameter set contained in a H.264 format description.

CMVideoFormatDescriptionCreateFromBigEndianImageDescriptionBlockBuffer

Creates a CMVideoFormatDescription from a big-endian ImageDescription data structure in a CMBlockBuffer.

CMVideoFormatDescriptionCreateFromBigEndianImageDescriptionData

Creates a CMVideoFormatDescription from a big-endian ImageDescription data structure.

CMSwapBigEndianImageDescriptionToHost

Converts an ImageDescription data structure from big-endian to host-endian in place.

CMSwapHostEndianImageDescriptionToBig

Converts an ImageDescription data structure from host-endian to big-endian in place.