FreeCalypso > hg > gsm-codec-lib
annotate libgsmefr/dtx.h @ 41:37e39cad5838
libgsmefr/*.tab: import from ETSI code
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Thu, 24 Nov 2022 22:58:29 +0000 |
parents | 36e1363ad885 |
children | 988fd7ff514f |
rev | line source |
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1 /*************************************************************************** |
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2 * |
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3 * File Name: dtx.h |
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4 * |
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5 * Purpose: Contains the prototypes for all the functions of DTX. |
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6 * Also contains definitions of constants used in DTX functions. |
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7 * |
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8 **************************************************************************/ |
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9 |
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10 #define PN_INITIAL_SEED 0x70816958L /* Pseudo noise generator seed value */ |
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11 |
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12 #define CN_INT_PERIOD 24 /* Comfort noise interpolation period |
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13 (nbr of frames between successive |
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14 SID updates in the decoder) */ |
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15 |
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16 #define DTX_HANGOVER 7 /* Period when SP=1 although VAD=0. |
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17 Used for comfort noise averaging */ |
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18 |
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19 |
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20 /* Frame classification constants */ |
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21 |
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22 #define VALID_SID_FRAME 1 |
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23 #define INVALID_SID_FRAME 2 |
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24 #define GOOD_SPEECH_FRAME 3 |
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25 #define UNUSABLE_FRAME 4 |
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26 |
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27 /* Encoder DTX control flags */ |
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28 |
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29 #define TX_SP_FLAG 0x0001 |
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30 #define TX_VAD_FLAG 0x0002 |
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31 #define TX_HANGOVER_ACTIVE 0x0004 |
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32 #define TX_PREV_HANGOVER_ACTIVE 0x0008 |
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33 #define TX_SID_UPDATE 0x0010 |
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34 #define TX_USE_OLD_SID 0x0020 |
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35 |
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36 /* Decoder DTX control flags */ |
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37 |
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38 #define RX_SP_FLAG 0x0001 |
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39 #define RX_UPD_SID_QUANT_MEM 0x0002 |
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40 #define RX_FIRST_SID_UPDATE 0x0004 |
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41 #define RX_CONT_SID_UPDATE 0x0008 |
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42 #define RX_LOST_SID_FRAME 0x0010 |
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43 #define RX_INVALID_SID_FRAME 0x0020 |
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44 #define RX_NO_TRANSMISSION 0x0040 |
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45 #define RX_DTX_MUTING 0x0080 |
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46 #define RX_PREV_DTX_MUTING 0x0100 |
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47 #define RX_CNI_BFI 0x0200 |
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48 #define RX_FIRST_SP_FLAG 0x0400 |
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49 |
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50 void reset_tx_dtx (void); /* Reset tx dtx variables */ |
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51 void reset_rx_dtx (void); /* Reset rx dtx variables */ |
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52 |
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53 void tx_dtx ( |
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54 Word16 VAD_flag, |
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55 Word16 *txdtx_ctrl |
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56 ); |
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57 |
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58 void rx_dtx ( |
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59 Word16 *rxdtx_ctrl, |
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60 Word16 TAF, |
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61 Word16 bfi, |
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62 Word16 SID_flag |
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63 ); |
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64 |
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65 void CN_encoding ( |
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66 Word16 params[], |
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67 Word16 txdtx_ctrl |
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68 ); |
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69 |
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70 void update_lsf_history ( |
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71 Word16 lsf1[M], |
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72 Word16 lsf2[M], |
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73 Word16 lsf_old[DTX_HANGOVER][M] |
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74 ); |
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75 |
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76 void update_lsf_p_CN ( |
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77 Word16 lsf_old[DTX_HANGOVER][M], |
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78 Word16 lsf_p_CN[M] |
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79 ); |
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80 |
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81 void aver_lsf_history ( |
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82 Word16 lsf_old[DTX_HANGOVER][M], |
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83 Word16 lsf1[M], |
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84 Word16 lsf2[M], |
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85 Word16 lsf_aver[M] |
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86 ); |
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87 |
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88 void update_gain_code_history_tx ( |
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89 Word16 new_gain_code, |
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90 Word16 gain_code_old_tx[4 * DTX_HANGOVER] |
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91 ); |
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92 |
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93 void update_gain_code_history_rx ( |
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94 Word16 new_gain_code, |
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95 Word16 gain_code_old_rx[4 * DTX_HANGOVER] |
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96 ); |
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97 |
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98 Word16 compute_CN_excitation_gain ( |
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99 Word16 res2[L_SUBFR] |
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100 ); |
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101 |
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102 Word16 update_gcode0_CN ( |
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103 Word16 gain_code_old_tx[4 * DTX_HANGOVER] |
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104 ); |
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105 |
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106 Word16 aver_gain_code_history ( |
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107 Word16 CN_excitation_gain, |
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108 Word16 gain_code_old[4 * DTX_HANGOVER] |
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109 ); |
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110 |
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111 void build_CN_code ( |
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112 Word16 cod[], |
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113 Word32 *seed |
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114 ); |
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115 |
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116 Word16 pseudonoise ( |
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117 Word32 *shift_reg, |
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118 Word16 no_bits |
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119 ); |
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120 |
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121 Word16 interpolate_CN_param ( |
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122 Word16 old_param, |
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123 Word16 new_param, |
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124 Word16 rx_dtx_state |
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125 ); |
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126 |
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127 void interpolate_CN_lsf ( |
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128 Word16 lsf_old_CN[M], |
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129 Word16 lsf_new_CN[M], |
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130 Word16 lsf_interp_CN[M], |
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131 Word16 rx_dtx_state |
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132 ); |