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annotate libgsmfr2/pp_state.h @ 605:63f774192906

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gsmhr_decoder_twts002_in(): set BFI=1 SID=1 for invalid SID When a received TW-TS-002 RTP payload indicates invalid SID, which of the 3 possible BFI/SID combinations should we pass to our internal ETSI-based speech decoder or TFO engine? Our original code passed BFI=0 SID=1, but upon further reflection, BFI=1 SID=1 is a better choice. In the corner case where received invalid SID is fed to a full decoder in homed state, setting BFI=1 allows that decoder to emit zeros on PCM and stay homed, instead of launching into full decoding.
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 04 Dec 2025 21:01:46 +0000
parents 96c4ed5529bf
children
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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 uint8_t cn_random_6fold;
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22 uint8_t dtxd_nodata_count;
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23 uint8_t dtxd_sid_flag;
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24 };
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26 /* we use the same LFSR PRNG for CN as ETSI EFR implementation */
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27 #define PN_INITIAL_SEED 0x70816958L /* Pseudo noise generator seed value */