FreeCalypso > hg > gsm-codec-lib
view libtwamr/sqrt_l.tab @ 605:63f774192906
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 | 8dfb7cbe6b59 |
| 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 : sqrt_l.tab * Purpose : Table for routine sqrt_l_exp() * $Id $ * ******************************************************************************** */ /* table[i] = sqrt((i+16)*2^-6) * 2^15, i.e. sqrt(x) scaled Q15 */ static const Word16 table[49] = { 16384, 16888, 17378, 17854, 18318, 18770, 19212, 19644, 20066, 20480, 20886, 21283, 21674, 22058, 22435, 22806, 23170, 23530, 23884, 24232, 24576, 24915, 25249, 25580, 25905, 26227, 26545, 26859, 27170, 27477, 27780, 28081, 28378, 28672, 28963, 29251, 29537, 29819, 30099, 30377, 30652, 30924, 31194, 31462, 31727, 31991, 32252, 32511, 32767 };