FreeCalypso > hg > gsm-net-reveng

annotate trau-decode/parse-fr.c @ 33:e828468b0afd

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doc/TFO-xform/Theory: article written
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 31 Aug 2024 20:45:25 +0000
parents 64b15810dc4c
children
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1 /*
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2 * This module implements the FR decoding part of trau-parse.
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3 */
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4
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5 #include <stdio.h>
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6 #include <stdint.h>
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7 #include <stdlib.h>
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8 #include <string.h>
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9 #include <strings.h>
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10 #include <tw_gsmfr.h>
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11
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12 /* this corresponds to the bit-lengths of the individual codec
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13 * parameters as indicated in Table 1.1 of TS 46.010 */
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14 static const uint8_t gsm_fr_map[GSMFR_NUM_PARAMS] = {
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15 6, 6, 5, 5, 4, 4, 3, 3,
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16 7, 2, 2, 6, 3, 3, 3, 3,
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17 3, 3, 3, 3, 3, 3, 3, 3,
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18 3, 7, 2, 2, 6, 3, 3, 3,
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19 3, 3, 3, 3, 3, 3, 3, 3,
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20 3, 3, 7, 2, 2, 6, 3, 3,
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21 3, 3, 3, 3, 3, 3, 3, 3,
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22 3, 3, 3, 7, 2, 2, 6, 3,
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23 3, 3, 3, 3, 3, 3, 3, 3,
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24 3, 3, 3, 3
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25 };
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27 static unsigned
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28 get_le(bits, nbits)
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29 uint8_t *bits;
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30 unsigned nbits;
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31 {
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32 unsigned accum, mask;
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33 unsigned n;
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34
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35 accum = 0;
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36 mask = 1;
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37 for (n = 0; n < nbits; n++) {
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38 if (*bits)
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39 accum |= mask;
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40 bits++;
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41 mask <<= 1;
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42 }
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43 return accum;
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44 }
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45
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46 static void
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47 dbits_to_params(d_bits, params)
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48 uint8_t *d_bits;
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49 int16_t *params;
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50 {
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51 unsigned np, len;
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52 uint8_t *ip;
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53 int16_t *op;
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54
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55 ip = d_bits;
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56 op = params;
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57 for (np = 0; np < GSMFR_NUM_PARAMS; np++) {
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58 len = gsm_fr_map[np];
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59 *op++ = get_le(ip, len);
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60 ip += len;
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61 }
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62 }
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63
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64 void
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65 print_fr_frame(d_bits)
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66 uint8_t *d_bits;
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67 {
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68 int16_t params[GSMFR_NUM_PARAMS];
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69 uint8_t rtp_pack[GSMFR_RTP_FRAME_LEN];
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70 int i, j, n, sid;
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71
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72 dbits_to_params(d_bits, params);
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73 fputs(" FR frame:\n LARc", stdout);
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74 n = 0;
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75 for (i = 0; i < 8; i++)
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76 printf(" %d", params[n++]);
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77 putchar('\n');
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78 for (i = 0; i < 4; i++) {
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79 fputs(" ", stdout);
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80 for (j = 0; j < 17; j++)
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81 printf(" %d", params[n++]);
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82 putchar('\n');
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83 }
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84 gsmfr_pack_from_array(params, rtp_pack);
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85 sid = gsmfr_preproc_sid_classify(rtp_pack);
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86 printf(" SID recompute: %d\n", sid);
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87 if (!bcmp(rtp_pack, gsmfr_decoder_homing_frame, GSMFR_RTP_FRAME_LEN))
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88 puts(" Matches DHF");
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89 }