FreeCalypso > hg > gsm-codec-lib
view libgsmfr2/pp_internal.h @ 261:cfcb3ce9c778
libgsmfr2: implement gsmfr_unpack_to_array()
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Fri, 12 Apr 2024 23:29:18 +0000 |
parents | a33edf624061 |
children | 573afa985df6 |
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/* * This header file is internal to libgsmfr2; * here we define our state structure for the Rx DTX preprocessor component. */ enum rx_dtx_st { NO_DATA = 0, SPEECH, SPEECH_MUTING, COMFORT_NOISE, LOST_SID, CN_MUTING, }; struct gsmfr_preproc_state { enum rx_dtx_st rx_state; uint8_t speech_frame[GSMFR_RTP_FRAME_LEN]; uint8_t 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, uint8_t *frame); extern void gsmfr_preproc_sid2cn(struct gsmfr_preproc_state *state, uint8_t *frame); extern void gsmfr_preproc_invalid_sid(struct gsmfr_preproc_state *state, uint8_t *frame); extern uint16_t gsmfr_preproc_prng(struct gsmfr_preproc_state *state, uint16_t no_bits); extern uint8_t gsmfr_preproc_xmaxc_mean(const uint8_t *frame);