Accelerate · IOS API REFERENCE

vDSP.DCT

class · iOS 13.0+ · SDK 27.1

class DCT

A class that provides single-precision discrete cosine transform.

Members (3)

init · iOS 13.0+

init

TypeScript

static init(previous: (vDSP_DCT) | null, count: number, transformType: vDSP_DCTTransformType): (vDSP_DCT) | null

Swift declaration

init?(previous: vDSP.DCT? = nil, count: Int, transformType: vDSP.DCTTransformType)

Initializes a new discrete cosine transform instance. - Parameter previous: a previous vDSP_DCT instance to share data with. - Parameter count: the number of real elements to be transformed. - Parameter transformType: Specifies the transform type (type II for forward and type III for inverse).

method · iOS 13.0+

transform

TypeScript

transformResult(vector: Array<number>, result: Array<number>): { $ret: null; $out: { "result": Array<number> } }

Swift declaration

func transform<U, V>(_ vector: U, result: inout V) where U : AccelerateBuffer, V : AccelerateMutableBuffer, U.Element == Float, V.Element == Float

Computes an out-of-place single-precision real discrete cosine transform. - Parameter input: Real input vector. - Parameter output: Real output vector.

Omit the output parameters from the call. The result contains $ret and $out, with result inside $out.

method · iOS 13.0+

transform

TypeScript

transform(vector: Array<number>): Array<number>

Swift declaration

func transform<U>(_ vector: U) -> [Float] where U : AccelerateBuffer, U.Element == Float

Returns the single-precision real discrete cosine transform. - Parameter input: Real input vector. - Returns: Real output vector.

Skipped declarations

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