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.

/*
 * This module contains our EFR_decode_frame() function, which is the primary
 * (most common, most useful) interface to our EFR decoder.
 */

#include "gsm_efr.h"

void EFR_decode_frame(struct EFR_decoder_state *st, const uint8_t *frame,
		      int bfi, int taf, int16_t *pcm_out)
{
	int16_t params[EFR_NUM_PARAMS];
	int sid;

	EFR_frame2params(frame, params);
	sid = EFR_sid_classify(frame);
	EFR_decode_params(st, params, bfi, sid, taf, pcm_out);
}