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comparison libgsmhr1/twts002_in.c @ 491:45bf34451dd7

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libgsmhr1: implement TW-TS-002 input
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 15 Jun 2024 06:22:21 +0000
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490:4d80730683d4 491:45bf34451dd7
1 /*
2 * The function implemented in this module parses a received TW-TS-002
3 * RTP payload and turns it into the internal input form for the HRv1
4 * decoder.
5 */
6
7 #include <stdint.h>
8 #include <string.h>
9 #include "tw_gsmhr.h"
10
11 int gsmhr_decoder_twts002_in(const uint8_t *payload, int16_t *params)
12 {
13 int ft;
14
15 if (payload[0] & 0x80)
16 return -1;
17 ft = payload[0] >> 4;
18 switch (ft) {
19 case 0:
20 gsmhr_unpack_ts101318(payload + 1, params);
21 params[18] = 0; /* BFI */
22 params[20] = 0; /* SID */
23 break;
24 case 1:
25 memset(params, 0, sizeof(int16_t) * GSMHR_NUM_PARAMS);
26 params[18] = 0; /* BFI */
27 params[20] = 1; /* SID */
28 break;
29 case 2:
30 gsmhr_unpack_ts101318(payload + 1, params);
31 params[18] = 0; /* BFI */
32 params[20] = 2; /* SID */
33 break;
34 case 6:
35 gsmhr_unpack_ts101318(payload + 1, params);
36 params[18] = 1; /* BFI */
37 params[20] = 0; /* SID */
38 break;
39 case 7:
40 memset(params, 0, sizeof(int16_t) * GSMHR_NUM_PARAMS);
41 params[18] = 2; /* BFI with no data */
42 params[20] = 0; /* SID */
43 break;
44 default:
45 return -2;
46 }
47 /* UFI and TAF always get their own bits */
48 params[19] = (payload[0] & 0x02) >> 1;
49 params[21] = payload[0] & 0x01;
50 return 0;
51 }