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annotate libtwamr/dec_amr.h @ 458:e26b974f7ba3

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doc/AMR-study-utils: update for the current situation
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 10 May 2024 18:45:36 +0000
parents 7bef001cd8b8
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 : dec_amr.h
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11 * Purpose : Speech decoder routine.
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12 *
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13 *****************************************************************************
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14 */
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15 #ifndef dec_amr_h
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16 #define dec_amr_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 #include "cnst.h"
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26 #include "dtx_dec.h"
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27 #include "d_plsf.h"
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28 #include "gc_pred.h"
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29 #include "ec_gains.h"
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30 #include "ph_disp.h"
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31 #include "c_g_aver.h"
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32 #include "bgnscd.h"
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33 #include "lsp_avg.h"
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34
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35 /*
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36 *****************************************************************************
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37 * LOCAL VARIABLES AND TABLES
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38 *****************************************************************************
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39 */
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40 /*---------------------------------------------------------------*
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41 * Postfilter constant parameters (defined in "cnst.h") *
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42 *---------------------------------------------------------------*
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43 * L_FRAME : Frame size. *
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44 * PIT_MAX : Maximum pitch lag. *
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45 * L_INTERPOL : Length of filter for interpolation. *
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46 * M : LPC order. *
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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 * DEFINITION OF DATA TYPES
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52 *****************************************************************************
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53 */
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54 typedef struct{
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55 /* Excitation vector */
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56 Word16 old_exc[L_SUBFR + PIT_MAX + L_INTERPOL];
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57 Word16 *exc;
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58
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59 /* Lsp (Line spectral pairs) */
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60 /* Word16 lsp[M]; */ /* Used by CN codec */
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61 Word16 lsp_old[M];
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62
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63 /* Filter's memory */
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64 Word16 mem_syn[M];
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65
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66 /* pitch sharpening */
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67 Word16 sharp;
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68 Word16 old_T0;
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69
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70 /* Memories for bad frame handling */
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71 Word16 prev_bf;
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72 Word16 prev_pdf;
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73 Word16 state;
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74 Word16 excEnergyHist[9];
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75
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76 /* Variable holding received ltpLag, used in background noise and BFI */
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77 Word16 T0_lagBuff;
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78
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79 /* Variables for the source characteristic detector (SCD) */
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80 Word16 inBackgroundNoise;
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81 Word16 voicedHangover;
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82 Word16 ltpGainHistory[9];
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83
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84 Bgn_scdState background_state;
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85 Word16 nodataSeed;
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86
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87 Cb_gain_averageState Cb_gain_averState;
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88 lsp_avgState lsp_avg_st;
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89
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90 D_plsfState lsfState;
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91 ec_gain_pitchState ec_gain_p_st;
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92 ec_gain_codeState ec_gain_c_st;
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93 gc_predState pred_state;
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94 ph_dispState ph_disp_st;
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95 dtx_decState dtxDecoderState;
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96 } Decoder_amrState;
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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 * DECLARATION OF PROTOTYPES
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102 *****************************************************************************
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103 */
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104
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105 /*
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106 **************************************************************************
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107 *
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108 * Function : Decoder_amr_reset
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109 * Purpose : Resets state memory
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110 * Returns : 0 on success
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111 *
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112 **************************************************************************
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113 */
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114 void Decoder_amr_reset (Decoder_amrState *st, Flag dtx_partial_reset);
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115
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116 /*
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117 **************************************************************************
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118 *
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119 * Function : Decoder_amr
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120 * Purpose : Speech decoder routine.
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121 * Returns : 0
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122 *
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123 **************************************************************************
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124 */
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125 int Decoder_amr (
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126 Decoder_amrState *st, /* i/o : State variables */
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127 enum Mode mode, /* i : AMR mode */
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128 Word16 parm[], /* i : vector of synthesis parameters
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129 (PRM_SIZE) */
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130 enum RXFrameType frame_type, /* i : received frame type */
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131 Word16 synth[], /* o : synthesis speech (L_FRAME) */
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132 Word16 A_t[] /* o : decoded LP filter in 4 subframes
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133 (AZ_SIZE) */
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134 );
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135
7bef001cd8b8 libtwamr: integrate dec_amr.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
136 #endif