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 header file defines the interface to our reader function for binary
 * files recording GSM FR or EFR streams, see ../doc/Binary-file-format.
 *
 * binfile_read_frame() return values are:
 *  1 = successfully read valid frame
 *  0 = normal EOF
 * -1 = unrecognized header byte
 * -2 = EOF in the middle of a frame
 */

#define	BINFILE_MAX_FRAME	33

extern int binfile_read_frame(FILE *binf, uint8_t *frame);