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annotate libgsmhr1/tfo.c @ 585:3c6bf0d26ee7

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TW-TS-005 reader: fix maximum line length bug TW-TS-005 section 4.1 states: The maximum allowed length of each line is 80 characters, not including the OS-specific newline encoding. The implementation of this line length limit in the TW-TS-005 hex file reader function in the present suite was wrong, such that lines of the full maximum length could not be read. Fix it. Note that this bug affects comment lines too, not just actual RTP payloads. Neither Annex A nor Annex B features an RTP payload format that goes to the maximum of 40 bytes, but if a comment line goes to the maximum allowed length of 80 characters not including the terminating newline, the bug will be triggered, necessitating the present fix.
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 25 Feb 2025 07:49:28 +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
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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 }