FreeCalypso > hg > gsm-codec-lib
view libgsmfrp/internal.h @ 271:d320a8fa3392
libgsmfr2: integrate short_term.c from libgsm
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sun, 14 Apr 2024 02:32:25 +0000 |
parents | 6ac547f0b903 |
children |
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/* * This header file is internal to libgsmfrp; * here we define our state structure. */ enum rx_state { NO_DATA = 0, SPEECH, SPEECH_MUTING, COMFORT_NOISE, LOST_SID, CN_MUTING, }; struct gsmfr_preproc_state { enum rx_state rx_state; gsm_frame speech_frame; gsm_byte sid_prefix[5]; uint8_t sid_xmaxc; uint32_t cn_random_lfsr; unsigned cn_random_6fold; }; /* we use the same LFSR PRNG for CN as ETSI EFR implementation */ #define PN_INITIAL_SEED 0x70816958L /* Pseudo noise generator seed value */ /* internal functions */ extern void gsmfr_preproc_gen_cn(struct gsmfr_preproc_state *state, gsm_byte *frame); extern void gsmfr_preproc_sid2cn(struct gsmfr_preproc_state *state, gsm_byte *frame); extern void gsmfr_preproc_invalid_sid(struct gsmfr_preproc_state *state, gsm_byte *frame); extern uint16_t gsmfr_preproc_prng(struct gsmfr_preproc_state *state, uint16_t no_bits); extern uint8_t gsmfr_preproc_xmaxc_mean(const gsm_byte *frame);