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annotate libgsmfr2/pp_internal.h @ 256:a33edf624061

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libgsmfr2: start with API definition and port of libgsmfrp code
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 12 Apr 2024 20:49:53 +0000
parents libgsmfrp/internal.h@6ac547f0b903
children 573afa985df6
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1 /*
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2 * This header file is internal to libgsmfr2;
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3 * here we define our state structure for the Rx DTX preprocessor component.
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4 */
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5
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6 enum rx_dtx_st {
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7 NO_DATA = 0,
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8 SPEECH,
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9 SPEECH_MUTING,
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10 COMFORT_NOISE,
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11 LOST_SID,
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12 CN_MUTING,
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13 };
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15 struct gsmfr_preproc_state {
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16 enum rx_dtx_st rx_state;
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17 uint8_t speech_frame[GSMFR_RTP_FRAME_LEN];
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18 uint8_t sid_prefix[5];
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19 uint8_t sid_xmaxc;
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20 uint32_t cn_random_lfsr;
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21 unsigned cn_random_6fold;
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22 };
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24 /* we use the same LFSR PRNG for CN as ETSI EFR implementation */
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25 #define PN_INITIAL_SEED 0x70816958L /* Pseudo noise generator seed value */
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27 /* internal functions */
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28 extern void gsmfr_preproc_gen_cn(struct gsmfr_preproc_state *state,
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29 uint8_t *frame);
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30 extern void gsmfr_preproc_sid2cn(struct gsmfr_preproc_state *state,
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31 uint8_t *frame);
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32 extern void gsmfr_preproc_invalid_sid(struct gsmfr_preproc_state *state,
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33 uint8_t *frame);
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34 extern uint16_t gsmfr_preproc_prng(struct gsmfr_preproc_state *state,
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35 uint16_t no_bits);
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36 extern uint8_t gsmfr_preproc_xmaxc_mean(const uint8_t *frame);