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annotate libtwamr/inter_36.c @ 485:751f06541fbb

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doc/Codec-utils: clarify lack of DHF in gsmfr-decode-rb
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 20 May 2024 01:47:22 +0000
parents 838ed426bb76
children
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1 /*
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2 ********************************************************************************
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3 *
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4 * GSM AMR-NB speech codec R98 Version 7.6.0 December 12, 2001
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5 * R99 Version 3.3.0
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6 * REL-4 Version 4.1.0
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7 *
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8 ********************************************************************************
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9 *
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10 * File : inter_36.c
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11 * Purpose : Interpolating the normalized correlation
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12 * : with 1/3 or 1/6 resolution.
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13 *
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14 ********************************************************************************
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15 */
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16 /*
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17 ********************************************************************************
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18 * MODULE INCLUDE FILE AND VERSION ID
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19 ********************************************************************************
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20 */
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21 #include "namespace.h"
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22 #include "inter_36.h"
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23
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24 /*
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25 ********************************************************************************
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26 * INCLUDE FILES
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27 ********************************************************************************
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28 */
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29 #include "typedef.h"
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30 #include "basic_op.h"
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31 #include "no_count.h"
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32 #include "cnst.h"
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33
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34 /*
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35 ********************************************************************************
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36 * LOCAL VARIABLES AND TABLES
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37 ********************************************************************************
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38 */
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39 #define UP_SAMP_MAX 6
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40
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41 #include "inter_36.tab"
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42
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43 /*
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44 ********************************************************************************
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45 * PUBLIC PROGRAM CODE
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46 ********************************************************************************
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47 */
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48 /*************************************************************************
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49 *
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50 * FUNCTION: Interpol_3or6()
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51 *
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52 * PURPOSE: Interpolating the normalized correlation with 1/3 or 1/6
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53 * resolution.
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54 *
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55 *************************************************************************/
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56 Word16 Interpol_3or6 ( /* o : interpolated value */
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57 Word16 *x, /* i : input vector */
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58 Word16 frac, /* i : fraction (-2..2 for 3*, -3..3 for 6*) */
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59 Word16 flag3 /* i : if set, upsampling rate = 3 (6 otherwise) */
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60 )
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61 {
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62 Word16 i, k;
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63 Word16 *x1, *x2;
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64 const Word16 *c1, *c2;
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65 Word32 s;
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66
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67 test();
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68 if (flag3 != 0)
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69 {
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70 frac = shl (frac, 1); /* inter_3[k] = inter_6[2*k] -> k' = 2*k */
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71 }
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72
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73 test ();
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74 if (frac < 0)
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75 {
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76 frac = add (frac, UP_SAMP_MAX);
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77 x--;
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78 }
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79
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80 x1 = &x[0]; move16 ();
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81 x2 = &x[1]; move16 ();
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82 c1 = &inter_6[frac]; move16 ();
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83 c2 = &inter_6[sub (UP_SAMP_MAX, frac)]; move16 ();
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84
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85 s = 0; move32 ();
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86 for (i = 0, k = 0; i < L_INTER_SRCH; i++, k += UP_SAMP_MAX)
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87 {
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88 s = L_mac (s, x1[-i], c1[k]);
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89 s = L_mac (s, x2[i], c2[k]);
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90 }
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91
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92 return round (s);
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93 }