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annotate libgsmhr1/twts002_in.c @ 529:79cd992de3ad

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libgsmfr2: API definitions for TFO transform
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 19 Sep 2024 08:07:26 +0000
parents 45bf34451dd7
children
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45bf34451dd7 libgsmhr1: implement TW-TS-002 input
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1 /*
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2 * The function implemented in this module parses a received TW-TS-002
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3 * RTP payload and turns it into the internal input form for the HRv1
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4 * decoder.
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5 */
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6
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7 #include <stdint.h>
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8 #include <string.h>
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9 #include "tw_gsmhr.h"
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10
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11 int gsmhr_decoder_twts002_in(const uint8_t *payload, int16_t *params)
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12 {
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13 int ft;
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14
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15 if (payload[0] & 0x80)
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16 return -1;
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17 ft = payload[0] >> 4;
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18 switch (ft) {
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19 case 0:
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20 gsmhr_unpack_ts101318(payload + 1, params);
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21 params[18] = 0; /* BFI */
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22 params[20] = 0; /* SID */
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23 break;
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24 case 1:
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25 memset(params, 0, sizeof(int16_t) * GSMHR_NUM_PARAMS);
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26 params[18] = 0; /* BFI */
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27 params[20] = 1; /* SID */
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28 break;
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29 case 2:
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30 gsmhr_unpack_ts101318(payload + 1, params);
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31 params[18] = 0; /* BFI */
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32 params[20] = 2; /* SID */
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33 break;
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34 case 6:
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35 gsmhr_unpack_ts101318(payload + 1, params);
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36 params[18] = 1; /* BFI */
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37 params[20] = 0; /* SID */
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38 break;
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39 case 7:
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40 memset(params, 0, sizeof(int16_t) * GSMHR_NUM_PARAMS);
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41 params[18] = 2; /* BFI with no data */
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42 params[20] = 0; /* SID */
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43 break;
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44 default:
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45 return -2;
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46 }
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47 /* UFI and TAF always get their own bits */
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48 params[19] = (payload[0] & 0x02) >> 1;
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49 params[21] = payload[0] & 0x01;
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50 return 0;
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51 }