FreeCalypso > hg > gsm-codec-lib
view libgsmefr/q_plsf5_tab.h @ 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 | cc08498ed21b |
| children |
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/* * The original ETSI EFR code features an include file named q_plsf_5.tab, * included into d_homing.c, d_plsf_5.c and q_plsf_5.c, duplicating * the small mean_lsf[] table across all 3 modules and the other (big) * tables across d_plsf_5.c for the decoder and q_plsf_5.c for the encoder. * * In our version we have moved the tables into q_plsf5_tab.c, * with extern declarations in q_plsf5_tab.h. */ extern const Word16 mean_lsf[10]; #define DICO1_SIZE 128 #define DICO2_SIZE 256 #define DICO3_SIZE 256 #define DICO4_SIZE 256 #define DICO5_SIZE 64 extern const Word16 dico1_lsf[DICO1_SIZE * 4]; extern const Word16 dico2_lsf[DICO2_SIZE * 4]; extern const Word16 dico3_lsf[DICO3_SIZE * 4]; extern const Word16 dico4_lsf[DICO4_SIZE * 4]; extern const Word16 dico5_lsf[DICO5_SIZE * 4];