FreeCalypso > hg > gsm-codec-lib
view libgsmefr/dhf.c @ 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 | ea89eb8291bf |
| children |
line wrap: on
line source
/* * This C module provides the RTP-encoded form of EFR DHF as an API-exported * const array. It is not used by the library itself (DHF check in the decoder * is done on the unpacked array of params, not on the RTP-encoded frame), * but we provide this const datum as part of API because it may be useful * to some users, and for consistency with libgsmfr2. */ #include <stdint.h> #include "gsm_efr.h" const uint8_t EFR_decoder_homing_frame[EFR_RTP_FRAME_LEN] = { 0xC0, 0x85, 0xEB, 0x49, 0x0F, 0xAA, 0xD6, 0x03, 0xE3, 0xA1, 0x86, 0x07, 0xB0, 0xC4, 0x2C, 0x08, 0x04, 0x80, 0x55, 0x80, 0x00, 0x00, 0x00, 0x00, 0x03, 0x6B, 0x00, 0x00, 0x00, 0x00, 0x00 };