libgsmhr1 TFO: require BFI=0 and SID=0 for homing In order for a received frame to be recognized as DHF, we need not only the correct bit pattern, but also BFI=0 and SID=0. The BFI=0 requirement should be obvious, while the SID=0 requirement is needed only for HR codec. With FR and EFR, SID classification comes from the payload bits and no separate check is needed - but in HR we get an out-of-band SID ternary flag. When SID=1, no payload bits are used at all; when SID=2, we use only the first 33 bits of the payload. Therefore, it is proper to conditionalize DHF acceptance on SID=0. We already implemented this logic in the just finished full decoder; now bring TFO code into agreement.

/*
 * This module contains our gsmfr_0610_decode_frame() function, which is
 * the primary (most common, most useful) interface to our GSM 06.10 decoder.
 */

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

void gsmfr_0610_decode_frame(struct gsmfr_0610_state *st, const uint8_t *frame,
			     int16_t *pcm_out)
{
	struct gsmfr_param_frame param;

	gsmfr_unpack_frame(frame, &param);
	gsmfr_0610_decode_params(st, &param, pcm_out);
}