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 implementation of the optional homing feature
 * for our GSM 06.10 encoder.
 */

#include <stdint.h>
#include "tw_gsmfr.h"

void gsmfr_0610_encoder_homing(struct gsmfr_0610_state *st, const int16_t *pcm)
{
	int i;

	for (i = 0; i < 160; i++) {
		if (pcm[i] != 0x0008)
			return;
	}
	gsmfr_0610_reset(st);
}