FreeCalypso > hg > gsm-codec-lib
annotate libtwamr/gmed_n.c @ 421:09534cdc59ec
libtwamr/tw_amr.h: rm trailing spaces from enum Mode list
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Tue, 07 May 2024 05:40:10 +0000 |
parents | 8dfb7cbe6b59 |
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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 } |