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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 16bc3036cc84
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Mychaela Falconia <falcon@freecalypso.org>
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1 The present GSM codec libraries & utilities package has been produced by the
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2 Presiding Sisterhood (government) of the Women's Republic of Themyscira as part
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3 of our Themyscira Wireless technical initiative. Because this development is a
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4 public works project, the resulting software is free to the world, i.e., public
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5 domain: all people anywhere in the world, of all genders, can use, copy, and
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6 modify it freely as they wish, including unlimited redistribution with or
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7 without modifications. We do ask, however, that any non-Themyscira
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8 modifications to this software be clearly noted and attributed.
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9
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10 The libgsmefr component of the present software package is based on the EFR
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11 reference code from the European Telecommunications Standards Institute (ETSI).
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12 Likewise, libtwamr component is based on the AMR reference code from ETSI and
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13 other Organizational Partners of the 3rd Generation Partnership Project (3GPP).