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annotate libgsmhr1/tfo.c @ 587:7bce90c844c2 default tip

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tw5b-dump: support verbose invalid SID per TW-TS-002 v1.2.0
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 12 Mar 2025 20:38:23 +0000
parents 7d0e565aa1ae
children
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7d0e565aa1ae libgsmhr1: implement TFO wrapper around RxFE
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1 /*
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2 * In this module we implement the TFO transform for HRv1. Our implementation
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3 * of this transform is a wrapper around our RxFE block that was specifically
7d0e565aa1ae libgsmhr1: implement TFO wrapper around RxFE
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4 * designed to be usable both for the full decoder and for TFO.
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5 */
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6
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7 #include <stddef.h>
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8 #include <stdint.h>
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9 #include <string.h>
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10 #include "tw_gsmhr.h"
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11 #include "namespace.h"
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12 #include "rxfe.h"
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13
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14 void gsmhr_tfo_xfrm(struct gsmhr_rxfe_state *st, int dtxd, const int16_t *ul,
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15 int16_t *dl)
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16 {
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17 rxfe_main(st, ul, dl, dtxd, NULL, NULL, dl + 19);
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18 if (dtxd) {
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19 dl[18] = 0; /* VAD=0 dummy setting */
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20 if (!dl[19]) /* turn CN into re-emission of SID */
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21 gsmhr_set_sid_cw_params(dl);
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22 } else {
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23 /* sans-DTX: VAD=1 SP=1 always */
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24 dl[18] = 1;
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25 dl[19] = 1;
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26 }
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27 /* homing logic */
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28 if (!ul[18] &&
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29 !memcmp(ul, gsmhr_dhf_params, sizeof(int16_t) * GSMHR_NUM_PARAMS))
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30 gsmhr_rxfe_reset(st);
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31 }