libgsmefr BFI w/o data: emit zero output after decoder reset In real-life usage, each EFR decoder session will most likely begin with lots of BFI frames before the first real frame arrives. However, because the spec-defined home state of the decoder is speech rather than CN, our regular logic for BFI w/o data would have to feed pseudorandom noise to the decoder (in the "fixed codebook excitation pulses" part), which is silly to do at the beginning of the decoder session right out of reset. Therefore, let's check reset_flag_old, and if we are still in the reset state, simply emit zero output.

/* Double precision operations */

void L_Extract (Word32 L_32, Word16 *hi, Word16 *lo);
Word32 L_Comp (Word16 hi, Word16 lo);
Word32 Mpy_32 (Word16 hi1, Word16 lo1, Word16 hi2, Word16 lo2);
Word32 Mpy_32_16 (Word16 hi, Word16 lo, Word16 n);
Word32 Div_32 (Word32 L_num, Word16 denom_hi, Word16 denom_lo);