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annotate libgsmfrp/internal.h @ 108:3b64f255689a

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libgsmfrp: factor out PRNG into its own module, in preparation for using it as part of speech muting too
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 28 Nov 2022 04:00:18 +0000
parents 286d5f097eb4
children f081a6850fb5
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1 /*
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2 * This header file is internal to libgsmfrp;
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3 * here we define our state structure.
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4 */
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6 enum rx_state {
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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 };
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14 struct gsmfr_preproc_state {
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15 enum rx_state rx_state;
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16 int got_valid_sid;
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17 gsm_frame speech_frame;
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18 gsm_byte sid_prefix[5];
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19 uint8_t sid_xmaxc[4];
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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 gsm_byte *frame);
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30 extern uint16_t gsmfr_preproc_prng(struct gsmfr_preproc_state *state,
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31 uint16_t no_bits);