Instance structure for #GstFFTF32. Data type for complex numbers composed of 32 bit float. Instance structure for #GstFFTF64. Data type for complex numbers composed of 64 bit float. Instance structure for #GstFFTS16. Data type for complex numbers composed of signed 16 bit integers. Instance structure for #GstFFTS32. Data type for complex numbers composed of signed 32 bit integers. The various window functions available.