FreeCalypso > hg > gsm-codec-lib
annotate libgsmfrp/internal.h @ 23:baadb1cb744d
new debug utility gsmrec-dump
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sun, 20 Nov 2022 08:05:32 +0000 |
parents | 286d5f097eb4 |
children | 3b64f255689a |
rev | line source |
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libgsmfrp: implement internal state
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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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5 |
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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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13 |
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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]; |
286d5f097eb4
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Mychaela Falconia <falcon@freecalypso.org>
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19 uint8_t sid_xmaxc[4]; |
286d5f097eb4
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Mychaela Falconia <falcon@freecalypso.org>
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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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23 |
286d5f097eb4
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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 */ |
286d5f097eb4
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Mychaela Falconia <falcon@freecalypso.org>
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26 |
286d5f097eb4
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Mychaela Falconia <falcon@freecalypso.org>
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27 /* internal function */ |
286d5f097eb4
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28 extern void gsmfr_preproc_gen_cn(struct gsmfr_preproc_state *state, |
286d5f097eb4
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29 gsm_byte *frame); |