FreeCalypso > hg > gsm-codec-lib
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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.
| author | Mychaela Falconia <falcon@freecalypso.org> |
|---|---|
| date | Thu, 04 Dec 2025 21:01:46 +0000 |
| parents | 16bc3036cc84 |
| children |
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The present GSM codec libraries & utilities package has been produced by the Presiding Sisterhood (government) of the Women's Republic of Themyscira as part of our Themyscira Wireless technical initiative. Because this development is a public works project, the resulting software is free to the world, i.e., public domain: all people anywhere in the world, of all genders, can use, copy, and modify it freely as they wish, including unlimited redistribution with or without modifications. We do ask, however, that any non-Themyscira modifications to this software be clearly noted and attributed. The libgsmefr component of the present software package is based on the EFR reference code from the European Telecommunications Standards Institute (ETSI). Likewise, libtwamr component is based on the AMR reference code from ETSI and other Organizational Partners of the 3rd Generation Partnership Project (3GPP).
