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annotate libtwamr/d_gain_c.c @ 553:ebcf414b7d99

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doc/TFO-transform: describe details for FRv1, both modes
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 07 Oct 2024 08:24:24 +0000
parents a723d9f9f697
children
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a723d9f9f697 libtwamr: integrate d_gain_c.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 : d_gain_c.c
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11 *
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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 ********************************************************************************
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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 "d_gain_c.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 "tw_amr.h"
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30 #include "typedef.h"
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31 #include "basic_op.h"
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32 #include "oper_32b.h"
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33 #include "no_count.h"
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34 #include "cnst.h"
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35 #include "log2.h"
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36 #include "pow2.h"
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37 #include "gc_pred.h"
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38 #include "gains_tab.h"
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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 **************************************************************************
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48 *
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49 * Function : d_gain_code
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50 * Purpose : Decode the fixed codebook gain using the received index.
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51 *
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52 **************************************************************************
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53 */
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54 void d_gain_code (
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55 gc_predState *pred_state, /* i/o : MA predictor state */
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56 enum Mode mode, /* i : AMR mode (MR795 or MR122) */
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57 Word16 index, /* i : received quantization index */
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58 Word16 code[], /* i : innovation codevector */
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59 Word16 *gain_code /* o : decoded innovation gain */
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60 )
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61 {
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62 Word16 gcode0, exp, frac;
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63 const Word16 *p;
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64 Word16 qua_ener_MR122, qua_ener;
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65 Word16 exp_inn_en;
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66 Word16 frac_inn_en;
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67 Word32 L_tmp;
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68
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69 /*-------------- Decode codebook gain ---------------*/
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70
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71 /*-------------------------------------------------------------------*
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72 * predict codebook gain *
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73 * ~~~~~~~~~~~~~~~~~~~~~ *
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74 * gc0 = Pow2(int(d)+frac(d)) *
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75 * = 2^exp + 2^frac *
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76 * *
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77 *-------------------------------------------------------------------*/
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78
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79 gc_pred(pred_state, mode, code, &exp, &frac,
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80 &exp_inn_en, &frac_inn_en);
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81
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82 p = &qua_gain_code[add (add (index, index), index)];
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83
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84 /* Different scalings between MR122 and the other modes */
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85 test ();
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86 if (sub(mode, MR122) == 0)
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87 {
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88 gcode0 = extract_l (Pow2 (exp, frac)); /* predicted gain */
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89 gcode0 = shl (gcode0, 4);
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90 *gain_code = shl (mult (gcode0, *p++), 1); move16 ();
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91 }
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92 else
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93 {
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94 gcode0 = extract_l (Pow2 (14, frac));
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95 L_tmp = L_mult(*p++, gcode0);
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96 L_tmp = L_shr(L_tmp, sub(9, exp));
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97 *gain_code = extract_h(L_tmp); /* Q1 */
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98 }
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99
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100 /*-------------------------------------------------------------------*
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101 * update table of past quantized energies *
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102 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ *
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103 *-------------------------------------------------------------------*/
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104 qua_ener_MR122 = *p++; move16();
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105 qua_ener = *p++; move16();
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106 gc_pred_update(pred_state, qua_ener_MR122, qua_ener);
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107
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108 return;
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109 }