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annotate libtwamr/calc_en.h @ 468:4104b0390fab

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author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 13 May 2024 07:21:09 +0000
parents 2df212a012af
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2df212a012af libtwamr: integrate calc_en.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 : calc_en.h
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11 * Purpose : calculation of energy coefficients for quantizers
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12 *
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13 ********************************************************************************
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14 */
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15 #ifndef calc_en_h
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16 #define calc_en_h "$Id $"
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17
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18 /*
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19 ********************************************************************************
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20 * INCLUDE FILES
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21 ********************************************************************************
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22 */
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23 #include "tw_amr.h"
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24 #include "typedef.h"
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25
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26 /*
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27 ********************************************************************************
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28 * DECLARATION OF PROTOTYPES
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29 ********************************************************************************
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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 * FUNCTION: calc_unfilt_energies
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35 *
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36 * PURPOSE: calculation of several energy coefficients for unfiltered
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37 * excitation signals and the LTP coding gain
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38 *
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39 * frac_en[0]*2^exp_en[0] = <res res> // LP residual energy
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40 * frac_en[1]*2^exp_en[1] = <exc exc> // LTP residual energy
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41 * frac_en[2]*2^exp_en[2] = <exc code> // LTP/CB innovation dot product
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42 * frac_en[3]*2^exp_en[3] = <lres lres> // LTP residual energy
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43 * // (lres = res - gain_pit*exc)
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44 * ltpg = log2(LP_res_en / LTP_res_en)
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45 *
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46 *************************************************************************/
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47 void
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48 calc_unfilt_energies(
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49 Word16 res[], /* i : LP residual, Q0 */
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50 Word16 exc[], /* i : LTP excitation (unfiltered), Q0 */
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51 Word16 code[], /* i : CB innovation (unfiltered), Q13 */
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52 Word16 gain_pit, /* i : pitch gain, Q14 */
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53 Word16 L_subfr, /* i : Subframe length */
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54
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55 Word16 frac_en[], /* o : energy coefficients (3), fraction part, Q15 */
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56 Word16 exp_en[], /* o : energy coefficients (3), exponent part, Q0 */
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57 Word16 *ltpg /* o : LTP coding gain (log2()), Q13 */
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58 );
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59
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60 /*************************************************************************
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61 *
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62 * FUNCTION: calc_filt_energies
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63 *
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64 * PURPOSE: calculation of several energy coefficients for filtered
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65 * excitation signals
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66 *
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67 * Compute coefficients need for the quantization and the optimum
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68 * codebook gain gcu (for MR475 only).
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69 *
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70 * coeff[0] = y1 y1
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71 * coeff[1] = -2 xn y1
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72 * coeff[2] = y2 y2
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73 * coeff[3] = -2 xn y2
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74 * coeff[4] = 2 y1 y2
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75 *
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76 *
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77 * gcu = <xn2, y2> / <y2, y2> (0 if <xn2, y2> <= 0)
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78 *
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79 * Product <y1 y1> and <xn y1> have been computed in G_pitch() and
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80 * are in vector g_coeff[].
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81 *
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82 *************************************************************************/
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83 void
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84 calc_filt_energies(
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85 enum Mode mode, /* i : coder mode */
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86 Word16 xn[], /* i : LTP target vector, Q0 */
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87 Word16 xn2[], /* i : CB target vector, Q0 */
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88 Word16 y1[], /* i : Adaptive codebook, Q0 */
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89 Word16 Y2[], /* i : Filtered innovative vector, Q12 */
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90 Word16 g_coeff[], /* i : Correlations <xn y1> <y1 y1> */
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91 /* computed in G_pitch() */
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92
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93 Word16 frac_coeff[],/* o : energy coefficients (5), fraction part, Q15 */
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94 Word16 exp_coeff[], /* o : energy coefficients (5), exponent part, Q0 */
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95 Word16 *cod_gain_frac,/* o: optimum codebook gain (fraction part), Q15 */
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96 Word16 *cod_gain_exp /* o: optimum codebook gain (exponent part), Q0 */
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97 );
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98
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99 /*************************************************************************
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100 *
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101 * FUNCTION: calc_target_energy
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102 *
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103 * PURPOSE: calculation of target energy
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104 *
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105 * en = <xn, xn>
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106 *
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107 *************************************************************************/
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108 void
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109 calc_target_energy(
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110 Word16 xn[], /* i: LTP target vector, Q0 */
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111 Word16 *en_exp, /* o: optimum codebook gain (exponent part), Q0 */
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112 Word16 *en_frac /* o: optimum codebook gain (fraction part), Q15 */
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113 );
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114 #endif