gsmhr_decoder_twts002_in(): set BFI=1 SID=1 for invalid SID When a received TW-TS-002 RTP payload indicates invalid SID, which of the 3 possible BFI/SID combinations should we pass to our internal ETSI-based speech decoder or TFO engine? Our original code passed BFI=0 SID=1, but upon further reflection, BFI=1 SID=1 is a better choice. In the corner case where received invalid SID is fed to a full decoder in homed state, setting BFI=1 allows that decoder to emit zeros on PCM and stay homed, instead of launching into full decoding.

/*
 * 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);
}