Function

CMVideoFormatDescriptionMatchesImageBuffer

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

Declaration

Boolean CMVideoFormatDescriptionMatchesImageBuffer(CMVideoFormatDescriptionRef desc, CVImageBufferRef imageBuffer);

Parameters

desc

CMVideoFormatDescription to validate.

imageBuffer

image buffer to validate against.

Return Value

A Boolean indicating whether the format description matches the image buffer.

Discussion

This function uses the keys returned by CMVideoFormatDescriptionGetExtensionKeysCommonWithImageBuffers to compare the extensions of the given format description to the attachments of the given image buffer (if an attachment is absent in either it must be absent in both). It also checks kCMFormatDescriptionExtension_BytesPerRow against CVPixelBufferGetBytesPerRow, if applicable.

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.

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.

CMVideoFormatDescriptionCopyAsBigEndianImageDescriptionBlockBuffer

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

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.