CoreMedia · IOS API REFERENCE

CMReadOnlyDataBlockBuffer.BlockRegion

struct · iOS 26.0+ · SDK 27.1

struct BlockRegion

A contiguous region of memory within a block buffer.

Members (7)

get · iOS 26.0+

startIndex

TypeScript

get startIndex(): number

Swift declaration

let startIndex: Int

The position of the first element in a nonempty collection.

method · iOS 26.0+

withUnsafeBytes

TypeScript

withUnsafeBytes(body: ((arg0: ArrayBuffer) => unknown)): unknown

Swift declaration

func withUnsafeBytes<ResultType>(_ body: (UnsafeRawBufferPointer) throws -> ResultType) rethrows -> ResultType

Calls the given closure with a pointer to the underlying bytes of the region’s contiguous storage.

method · iOS 26.0+

withContiguousStorageIfAvailable

TypeScript

withContiguousStorageIfAvailable(body: ((arg0: Uint8Array) => unknown)): (unknown) | null

Swift declaration

func withContiguousStorageIfAvailable<R>(_ body: (UnsafeBufferPointer<UInt8>) throws -> R) rethrows -> R?

Access contents of the buffer if available as contiguous memory block. This method calls body(buffer), where buffer is a pointer to the block buffers contiguous storage. If the contiguous storage doesn’t exist, the method doesn’t call body — it immediately returns nil.

get · iOS 26.0+

count

TypeScript

get count(): number

Swift declaration

var count: Int { get }

Number of bytes in the block region

get · iOS 26.0+

regions

TypeScript

get regions(): SDKHandle

Swift declaration

var regions: CollectionOfOne<CMReadOnlyDataBlockBuffer.BlockRegion> { get }

The single buffer that makes up this region.

get · iOS 26.0+

endIndex

TypeScript

get endIndex(): number

Swift declaration

var endIndex: Int { get }

The position one greater than the last valid subscript argument.

subscript · iOS 26.0+

subscript

TypeScript

subscript(position: number): number

Swift declaration

subscript(position: CMReadOnlyDataBlockBuffer.BlockRegion.Index) -> UInt8 { get }

Accesses the data byte at the specified position.

Skipped declarations

No declarations were skipped in this snapshot.

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