Descriptor Manipulation Functions

There are four functions in this category: create a descriptor, commit a descriptor, copy a descriptor, and free a descriptor.

• CreateDescriptor
  Allocates the descriptor data structure and initializes it with default configuration values.
• CommitDescriptor
  Performs all initialization for the actual FFT computation.
• CopyDescriptor
  Makes a copy of an existing descriptor.
• FreeDescriptor
  Frees the memory allocated for a descriptor.

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