Create Texture from CMSampleBuffer.swift

private func createTexture(sampleBuffer: CMSampleBuffer, planeIndex: Int, pixelFormat: MTLPixelFormat) throws -> MTLTexture {
    guard let cvImageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer) else {
        throw MyError.normal
    }
    let isPlanar = CVPixelBufferIsPlanar(cvImageBuffer)
    let width = isPlanar ? CVPixelBufferGetWidthOfPlane(cvImageBuffer, planeIndex) : CVPixelBufferGetWidth(cvImageBuffer)
    let height = isPlanar ? CVPixelBufferGetHeightOfPlane(cvImageBuffer, planeIndex) : CVPixelBufferGetHeight(cvImageBuffer)

    var cvMetalTexture: CVMetalTexture?
    CVMetalTextureCacheCreateTextureFromImage(nil, _textureCache!, cvImageBuffer, nil, pixelFormat, width, height, planeIndex, &cvMetalTexture)

    guard let cvMetalTextureUnbound = cvMetalTexture else {
        throw MyError.normal
    }
    return CVMetalTextureGetTexture(cvMetalTextureUnbound)!
}