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annotate libtwamr/gc_pred.h @ 443:526a7f0e027d

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author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 09 May 2024 21:00:33 +0000
parents 7f99b8ed30e5
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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 : gc_pred.h
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11 * Purpose : codebook gain MA prediction
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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 #ifndef gc_pred_h
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17 #define gc_pred_h "$Id $"
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18
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19 /*
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20 ********************************************************************************
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21 * INCLUDE FILES
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22 ********************************************************************************
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23 */
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24 #include "tw_amr.h"
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25 #include "typedef.h"
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26
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27 /*
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28 ********************************************************************************
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29 * LOCAL VARIABLES AND TABLES
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30 ********************************************************************************
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31 */
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32
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33 /*
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34 ********************************************************************************
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35 * DEFINITION OF DATA TYPES
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36 ********************************************************************************
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37 */
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38 typedef struct {
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39 Word16 past_qua_en[4]; /* normal MA predictor memory, Q10 */
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40 /* (contains 20*log10(qua_err)) */
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41 Word16 past_qua_en_MR122[4]; /* MA predictor memory for MR122 mode, Q10 */
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42 /* (contains log2(qua_err)) */
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43 } gc_predState;
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44
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45 /*
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46 ********************************************************************************
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47 * DECLARATION OF PROTOTYPES
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48 ********************************************************************************
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49 */
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50
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51 void gc_pred_reset (gc_predState *st);
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52 /* reset of codebook gain MA predictor state (i.e. set state memory to zero)
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53 returns 0 on success
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54 */
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55
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56 void
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57 gc_pred_copy(
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58 gc_predState *st_src, /* i : State struct */
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59 gc_predState *st_dest /* o : State struct */
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60 );
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61
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62 /*************************************************************************
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63 *
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64 * FUNCTION: gc_pred()
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65 *
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66 * PURPOSE: MA prediction of the innovation energy
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67 * (in dB/(20*log10(2))) with mean removed).
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68 *
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69 *************************************************************************/
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70 void gc_pred(
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71 gc_predState *st, /* i/o: State struct */
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72 enum Mode mode, /* i : AMR mode */
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73 Word16 *code, /* i : innovative codebook vector (L_SUBFR) */
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74 /* MR122: Q12, other modes: Q13 */
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75 Word16 *exp_gcode0, /* o : exponent of predicted gain factor, Q0 */
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76 Word16 *frac_gcode0,/* o : fraction of predicted gain factor Q15 */
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77 Word16 *exp_en, /* o : exponent of innovation energy, Q0 */
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78 /* (only calculated for MR795) */
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79 Word16 *frac_en /* o : fraction of innovation energy, Q15 */
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80 /* (only calculated for MR795) */
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81 );
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82
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83 /*************************************************************************
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84 *
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85 * FUNCTION: gc_pred_update()
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86 *
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87 * PURPOSE: update MA predictor with last quantized energy
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88 *
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89 *************************************************************************/
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90 void gc_pred_update(
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91 gc_predState *st, /* i/o: State struct */
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92 Word16 qua_ener_MR122, /* i : quantized energy for update, Q10 */
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93 /* (log2(qua_err)) */
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94 Word16 qua_ener /* i : quantized energy for update, Q10 */
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95 /* (20*log10(qua_err)) */
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96 );
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97
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98 /*************************************************************************
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99 *
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100 * FUNCTION: gc_pred_average_limited()
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101 *
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102 * PURPOSE: get average of MA predictor state values (with a lower limit)
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103 * [used in error concealment]
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104 *
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105 *************************************************************************/
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106 void gc_pred_average_limited(
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107 gc_predState *st, /* i: State struct */
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108 Word16 *ener_avg_MR122, /* o: averaged quantized energy, Q10 */
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109 /* (log2(qua_err)) */
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110 Word16 *ener_avg /* o: averaged quantized energy, Q10 */
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111 /* (20*log10(qua_err)) */
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112 );
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113
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114 #endif