FreeCalypso > hg > gsm-codec-lib
view libtwamr/sid_sync.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 | a8b73b1c5b19 |
| 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 : sid_sync.h * Purpose : To ensure that the mode only switches to a * neighbouring mode * ***************************************************************************** */ #ifndef sid_sync_h #define sid_sync_h "$Id $" /* ***************************************************************************** * INCLUDE FILES ***************************************************************************** */ #include "tw_amr.h" #include "typedef.h" /* ****************************************************************************** * CONSTANTS ****************************************************************************** */ /* ****************************************************************************** * DEFINITION OF DATA TYPES ****************************************************************************** */ typedef struct { Word16 sid_update_rate; /* Send SID Update every sid_update_rate frame */ Word16 sid_update_counter; /* Number of frames since last SID */ Word16 sid_handover_debt; /* Number of extra SID_UPD frames to schedule*/ enum TXFrameType prev_ft; } sid_syncState; /* ***************************************************************************** * LOCAL VARIABLES AND TABLES ***************************************************************************** */ /* ***************************************************************************** * DECLARATION OF PROTOTYPES ***************************************************************************** */ void sid_sync_reset (sid_syncState *st); /* reset of sid_sync module (i.e. set state memory to zero) returns 0 on success */ int sid_sync_set_handover_debt (sid_syncState *st, /* i/o: sid_sync state */ Word16 debtFrames); /* update handover debt debtFrames extra SID_UPD are scheduled . to update remote decoder CNI states, right after an handover. (primarily for use on MS UL side ) */ void sid_sync(sid_syncState *st , /* i/o: sid_sync state */ enum Mode mode, enum TXFrameType *tx_frame_type); #endif