FreeCalypso > hg > gsm-codec-lib
annotate libgsmfr2/pp_state.h @ 482:5e2d849a4fbc
doc/Calypso-TCH-downlink: grammar fix
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Mon, 20 May 2024 01:24:22 +0000 |
parents | 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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14 |
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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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23 |
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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 */ |