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annotate libtwamr/qgain475.h @ 478:936a08cc73ce

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doc/AMR-library-API: describe the decoder
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 19 May 2024 21:32:31 +0000
parents 1d2b39027b70
children
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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 : qgain475.h
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11 * Purpose : Quantization of pitch and codebook gains for MR475.
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12 *
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13 ********************************************************************************
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14 */
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15 #ifndef qgain475_h
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16 #define qgain475_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 "typedef.h"
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24 #include "gc_pred.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: MR475_update_unq_pred()
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35 *
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36 * PURPOSE: use optimum codebook gain and update "unquantized"
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37 * gain predictor with the (bounded) prediction error
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38 *
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39 *************************************************************************/
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40 void
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41 MR475_update_unq_pred(
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42 gc_predState *pred_st, /* i/o: gain predictor state struct */
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43 Word16 exp_gcode0, /* i : predicted CB gain (exponent), Q0 */
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44 Word16 frac_gcode0, /* i : predicted CB gain (fraction), Q15 */
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45 Word16 cod_gain_exp, /* i : optimum codebook gain (exponent), Q0 */
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46 Word16 cod_gain_frac /* i : optimum codebook gain (fraction), Q15 */
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47 );
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48
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49 /*************************************************************************
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50 *
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51 * FUNCTION: MR475_gain_quant()
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52 *
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53 * PURPOSE: Quantization of pitch and codebook gains for two subframes
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54 * (using predicted codebook gain)
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55 *
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56 *************************************************************************/
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57
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58 Word16
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59 MR475_gain_quant( /* o : index of quantization. */
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60 gc_predState *pred_st, /* i/o: gain predictor state struct */
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61
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62 /* data from subframe 0 (or 2) */
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63 Word16 sf0_exp_gcode0, /* i : predicted CB gain (exponent), Q0 */
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64 Word16 sf0_frac_gcode0, /* i : predicted CB gain (fraction), Q15 */
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65 Word16 sf0_exp_coeff[], /* i : energy coeff. (5), exponent part, Q0 */
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66 Word16 sf0_frac_coeff[], /* i : energy coeff. (5), fraction part, Q15 */
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67 /* (frac_coeff and exp_coeff computed in */
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68 /* calc_filt_energies()) */
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69 Word16 sf0_exp_target_en, /* i : exponent of target energy, Q0 */
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70 Word16 sf0_frac_target_en, /* i : fraction of target energy, Q15 */
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71
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72 /* data from subframe 1 (or 3) */
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73 Word16 sf1_code_nosharp[], /* i : innovative codebook vector (L_SUBFR) */
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74 /* (whithout pitch sharpening) */
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75 Word16 sf1_exp_gcode0, /* i : predicted CB gain (exponent), Q0 */
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76 Word16 sf1_frac_gcode0, /* i : predicted CB gain (fraction), Q15 */
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77 Word16 sf1_exp_coeff[], /* i : energy coeff. (5), exponent part, Q0 */
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78 Word16 sf1_frac_coeff[], /* i : energy coeff. (5), fraction part, Q15 */
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79 /* (frac_coeff and exp_coeff computed in */
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80 /* calc_filt_energies()) */
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81 Word16 sf1_exp_target_en, /* i : exponent of target energy, Q0 */
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82 Word16 sf1_frac_target_en, /* i : fraction of target energy, Q15 */
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83
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84 Word16 gp_limit, /* i : pitch gain limit */
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85
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86 Word16 *sf0_gain_pit, /* o : Pitch gain, Q14 */
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87 Word16 *sf0_gain_cod, /* o : Code gain, Q1 */
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88
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89 Word16 *sf1_gain_pit, /* o : Pitch gain, Q14 */
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90 Word16 *sf1_gain_cod /* o : Code gain, Q1 */
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91 );
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92 #endif