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annotate libtwamr/gmed_n.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 8dfb7cbe6b59
children
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8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
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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 : gmed_n.c
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11 * Purpose : calculates N-point median.
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12 *
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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 * MODULE INCLUDE FILE AND VERSION ID
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18 ********************************************************************************
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19 */
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20 #include "namespace.h"
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21 #include "gmed_n.h"
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22
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23 /*
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24 ********************************************************************************
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25 * INCLUDE FILES
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26 ********************************************************************************
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27 */
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28 #include "typedef.h"
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29 #include "basic_op.h"
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30 #include "no_count.h"
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31
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32 /*
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33 ********************************************************************************
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34 * LOCAL VARIABLES AND TABLES
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35 ********************************************************************************
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36 */
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37
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38 #define NMAX 9 /* largest N used in median calculation */
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39
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40 /*
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41 ********************************************************************************
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42 * PUBLIC PROGRAM CODE
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43 ********************************************************************************
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44 */
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45 /*************************************************************************
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46 *
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47 * FUNCTION: gmed_n
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48 *
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49 * PURPOSE: calculates N-point median.
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50 *
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51 * DESCRIPTION:
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52 *
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53 *************************************************************************/
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54
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55 Word16 gmed_n ( /* o : index of the median value (0...N-1) */
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56 Word16 ind[], /* i : Past gain values */
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57 Word16 n /* i : The number of gains; this routine */
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58 /* is only valid for a odd number of gains */
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59 /* (n <= NMAX) */
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60 )
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61 {
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62 Word16 i, j, ix = 0;
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63 Word16 max;
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64 Word16 medianIndex;
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65 Word16 tmp[NMAX];
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66 Word16 tmp2[NMAX];
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67
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68 for (i = 0; i < n; i++)
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69 {
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70 tmp2[i] = ind[i]; move16 ();
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71 }
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72
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73 for (i = 0; i < n; i++)
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74 {
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75 max = -32767; move16 ();
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76 for (j = 0; j < n; j++)
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77 {
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78 test ();
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79 if (sub (tmp2[j], max) >= 0)
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80 {
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81 max = tmp2[j]; move16 ();
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82 ix = j; move16 ();
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83 }
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84 }
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85 tmp2[ix] = -32768; move16 ();
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86 tmp[i] = ix; move16 ();
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87 }
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88
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89 medianIndex=tmp[ shr(n,1) ]; move16 (); /* account for complex addressing */
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90 return (ind[medianIndex]);
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91 }