view hrutil/print-frame.c @ 604:54f0f1b74c25

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.
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 04 Dec 2025 19:40:35 +0000
parents bb36ef735f25
children
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/*
 * Here we implement the common function that prints the parameters body
 * of each GSM-HR codec frame, whichever file format we read it from.
 */

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

print_frame_params(params)
	int16_t *params;
{
	printf("  R0=%02x LPC=%03x,%03x,%02x Int=%x Mode=%x\n", params[0],
		params[1], params[2], params[3], params[4], params[5]);
	printf(params[5] ? "  s1=%02x,%03x,%02x" : "  s1=%02x,%02x,%02x",
		params[6], params[7], params[8]);
	printf(params[5] ? " s2=%x,%03x,%02x" : " s2=%02x,%02x,%02x",
		params[9], params[10], params[11]);
	printf(params[5] ? " s3=%x,%03x,%02x" : " s3=%02x,%02x,%02x",
		params[12], params[13], params[14]);
	printf(params[5] ? " s4=%x,%03x,%02x\n" : " s4=%02x,%02x,%02x\n",
		params[15], params[16], params[17]);
}