FreeCalypso > hg > ice1-trau-tester

annotate ater8/out_frame.c @ 51:db39e8855f3d

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ater: implement play-d144
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 25 Sep 2024 05:53:38 +0000
parents ff94d7fc5891
children
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1 /*
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2 * Here we implement our TRAU-UL bit filling function for HRv1 8 kbit/s format.
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3 *
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4 * This code is based (very loosely) on trau_rtp_conv.c in libosmo-abis.
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5 */
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6
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7 #include <stdint.h>
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8 #include <stdbool.h>
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9 #include <string.h>
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11 #include <osmocom/core/bits.h>
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12 #include <osmocom/core/crc8gen.h>
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13 #include <osmocom/core/utils.h>
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14 #include <osmocom/trau/trau_frame.h>
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15 #include "../libhr/tw_gsmhr.h"
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17 #include "out_frame.h"
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19 /*
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20 * EFR TRAU parity (also used for HR)
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21 *
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22 * g(x) = x^3 + x^1 + 1
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23 */
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24 static const struct osmo_crc8gen_code gsm0860_efr_crc3 = {
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25 .bits = 3,
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26 .poly = 0x3,
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27 .init = 0x0,
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28 .remainder = 0x7,
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29 };
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31 void trau_frame_from_record(const int16_t *rec, struct osmo_trau_frame *tf,
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32 bool *has_taf)
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33 {
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34 uint8_t ts101318[GSMHR_FRAME_LEN_RPF];
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35 int16_t bfi, sid;
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36
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37 /* payload transformation is straightforward */
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38 gsmhr_pack_ts101318(rec, ts101318);
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39 osmo_pbit2ubit(tf->d_bits, ts101318, 14 * 8);
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40 osmo_crc8gen_set_bits(&gsm0860_efr_crc3, tf->d_bits, 44, tf->crc_bits);
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42 /* transformation of metadata flags is the messy part */
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43 bfi = rec[18];
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44 sid = rec[20];
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45 switch (sid) {
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46 case 0:
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47 if (bfi) {
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48 tf->xc_bits[1] = 1;
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49 tf->xc_bits[2] = 1;
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50 *has_taf = true;
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51 } else {
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52 tf->xc_bits[1] = 0;
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53 tf->xc_bits[2] = 0;
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54 tf->xc_bits[3] = 0;
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55 *has_taf = false;
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56 }
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57 break;
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58 case 1:
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59 tf->xc_bits[1] = 1;
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60 tf->xc_bits[2] = 0;
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61 *has_taf = true;
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62 break;
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63 case 2:
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64 if (bfi) {
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65 tf->xc_bits[1] = 1;
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66 tf->xc_bits[2] = 0;
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67 *has_taf = true;
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68 } else {
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69 tf->xc_bits[1] = 0;
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70 tf->xc_bits[2] = 0;
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71 tf->xc_bits[3] = 1;
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72 *has_taf = false;
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73 }
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74 break;
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75 default:
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76 OSMO_ASSERT(0);
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77 }
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78 /* XC5 is always UFI */
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79 tf->xc_bits[4] = rec[19];
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80 }