void ff_celt_imdct_half_neon(CeltIMDCTContext *s, float *dst, const float *src, ptrdiff_t stride, float scale)
void(* imdct_half)(struct CeltIMDCTContext *s, float *dst, const float *src, ptrdiff_t src_stride, float scale)
Calculate the middle half of the iMDCT.