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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 bfe74a9edd5a
children
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/*
********************************************************************************
*
*      GSM AMR-NB speech codec   R98   Version 7.6.0   December 12, 2001
*                                R99   Version 3.3.0                
*                                REL-4 Version 4.1.0                
*
********************************************************************************
*
*      File             : log2.tab
*      Purpose          : Table for routine Log2().
*      $Id $
*
********************************************************************************
*/
static const Word16 table[33] =
{
    0, 1455, 2866, 4236, 5568, 6863, 8124, 9352, 10549, 11716,
    12855, 13967, 15054, 16117, 17156, 18172, 19167, 20142, 21097, 22033,
    22951, 23852, 24735, 25603, 26455, 27291, 28113, 28922, 29716, 30497,
    31266, 32023, 32767
};