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.

/*
 * Here we implement our binfile_read_frame() function.
 */

#include <stdio.h>
#include <stdint.h>
#include "binreader.h"

int binfile_read_frame(FILE *binf, uint8_t *frame)
{
	int cc, morelen;

	cc = fread(frame, 1, 1, binf);
	if (cc != 1)
		return 0;
	if (frame[0] == 0xBF)
		morelen = 1;
	else if ((frame[0] & 0xF0) == 0xC0)
		morelen = 30;
	else if ((frame[0] & 0xF0) == 0xD0)
		morelen = 32;
	else
		return -1;
	cc = fread(frame+1, 1, morelen, binf);
	if (cc == morelen)
		return 1;
	else
		return -2;
}