FreeCalypso > hg > gsm-codec-lib
annotate libtwamr/dec_amr.h @ 486:f35c8fd9ceba
CHANGES: document gsmrec-dump improvements
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Mon, 20 May 2024 02:07:30 +0000 |
parents | 7bef001cd8b8 |
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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 |
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136 #endif |