ff_lpc_calc_ref_coefs_f  196 libavcodec/aacenc_tns.c         gain = ff_lpc_calc_ref_coefs_f(&s->lpc, &sce->coeffs[w*128 + coef_start],
ff_lpc_calc_ref_coefs_f  103 libavcodec/lpc.h double ff_lpc_calc_ref_coefs_f(LPCContext *s, const float *samples, int len,