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annotate libgsmefr/codec.h @ 183:452c1d5a6268

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libgsmefr BFI w/o data: emit zero output after decoder reset In real-life usage, each EFR decoder session will most likely begin with lots of BFI frames before the first real frame arrives. However, because the spec-defined home state of the decoder is speech rather than CN, our regular logic for BFI w/o data would have to feed pseudorandom noise to the decoder (in the "fixed codebook excitation pulses" part), which is silly to do at the beginning of the decoder session right out of reset. Therefore, let's check reset_flag_old, and if we are still in the reset state, simply emit zero output.
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 03 Jan 2023 00:12:18 +0000
parents d80e9f12a1d1
children
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1 void Init_Coder_12k2 (struct EFR_encoder_state *st);
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3 void Coder_12k2 (
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4 struct EFR_encoder_state *st,
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5 Word16 ana[], /* output : Analysis parameters */
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6 Word16 synth[] /* output : Local synthesis */
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7 );
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8
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9 void Init_Decoder_12k2 (struct EFR_decoder_state *st);
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11 void Decoder_12k2 (
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12 struct EFR_decoder_state *st,
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13 Word16 bfi, /* input : Bad Frame Indication */
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14 const Word16 parm[], /* input : vector of synthesis parameters */
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15 Word16 synth[], /* output: synthesis speech */
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16 Word16 A_t[], /* output: decoded LP filter in 4 subframes */
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17 Word16 TAF,
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18 Word16 SID_flag
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19 );
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21 void Init_Post_Filter (struct EFR_decoder_state *st);
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23 void Post_Filter (
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24 struct EFR_decoder_state *st,
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25 Word16 *syn, /* in/out: synthesis speech (postfiltered is output) */
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26 Word16 *Az_4 /* input : interpolated LPC parameters in all subfr. */
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27 );
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29 void code_10i40_35bits (
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30 Word16 x[], /* (i) : target vector */
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31 Word16 cn[], /* (i) : residual after long term prediction */
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32 Word16 h[], /* (i) : impulse response of weighted synthesis
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33 filter */
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34 Word16 cod[], /* (o) : algebraic (fixed) codebook excitation */
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35 Word16 y[], /* (o) : filtered fixed codebook excitation */
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36 Word16 indx[] /* (o) : index of 10 pulses (sign + position) */
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37 );
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38 void dec_10i40_35bits (
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39 const Word16 index[],/* (i) : index of 10 pulses (sign+position) */
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40 Word16 cod[] /* (o) : algebraic (fixed) codebook excitation */
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41 );
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43 Word16 Dec_lag6 ( /* output: return integer pitch lag */
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44 struct EFR_decoder_state *st,
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45 Word16 index, /* input : received pitch index */
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46 Word16 pit_min, /* input : minimum pitch lag */
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47 Word16 pit_max, /* input : maximum pitch lag */
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48 Word16 i_subfr, /* input : subframe flag */
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49 Word16 L_frame_by2,/* input : speech frame size divided by 2 */
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50 Word16 *T0_frac, /* output: fractional part of pitch lag */
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51 Word16 bfi, /* input : bad frame indicator */
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52 Word16 *T0_min, /* var from one subframe to the next */
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53 Word16 *T0_max /* ditto */
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54 );
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55 Word16 d_gain_pitch ( /* out : quantized pitch gain */
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56 struct EFR_decoder_state *st,
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57 Word16 index, /* in : index of quantization */
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58 Word16 bfi, /* in : bad frame indicator (good = 0) */
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59 Word16 state, /* in : state of the state machine */
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60 Word16 prev_bf, /* Previous bf */
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61 Word16 rxdtx_ctrl
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63 );
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64 void d_gain_code (
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65 struct EFR_decoder_state *st,
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66 Word16 index, /* input : received quantization index */
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67 Word16 code[], /* input : innovation codevector */
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68 Word16 lcode, /* input : codevector length */
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69 Word16 *gain_code, /* output: decoded innovation gain */
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70 Word16 bfi, /* input : bad frame indicator */
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71 Word16 state, /* in : state of the state machine */
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72 Word16 prev_bf, /* Previous bf */
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73 Word16 rxdtx_ctrl,
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74 Word16 i_subfr,
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75 Word16 rx_dtx_state
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76
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77 );
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78 void D_plsf_5 (
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79 struct EFR_decoder_state *st,
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80 const Word16 *indice,/* input : quantization indices of 5 submatrices */
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81 Word16 *lsp1_q, /* output: quantized 1st LSP vector */
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82 Word16 *lsp2_q, /* output: quantized 2nd LSP vector */
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83 Word16 bfi, /* input : bad frame indicator (set to 1 if a bad
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84 frame is received) */
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85 Word16 rxdtx_ctrl,
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86 Word16 rx_dtx_state
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87 );
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88
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89 Word16 Enc_lag6 ( /* output: Return index of encoding */
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90 Word16 T0, /* input : Pitch delay */
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91 Word16 *T0_frac, /* in/out: Fractional pitch delay */
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92 Word16 *T0_min, /* in/out: Minimum search delay */
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93 Word16 *T0_max, /* in/out: Maximum search delay */
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94 Word16 pit_min, /* input : Minimum pitch delay */
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95 Word16 pit_max, /* input : Maximum pitch delay */
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96 Word16 pit_flag /* input : Flag for 1st or 3rd subframe */
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97 );
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98
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99 Word16 q_gain_pitch ( /* Return index of quantization */
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100 Word16 *gain /* (i) : Pitch gain to quantize */
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101 );
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102
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103 Word16 q_gain_code ( /* Return quantization index */
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104 struct EFR_encoder_state *st,
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105 Word16 code[], /* (i) : fixed codebook excitation */
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106 Word16 lcode, /* (i) : codevector size */
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107 Word16 *gain, /* (i/o) : quantized fixed codebook gain */
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108 Word16 txdtx_ctrl,
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109 Word16 i_subfr
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110 );
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111
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112 Word16 G_pitch ( /* (o) : Gain of pitch lag saturated to 1.2 */
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113 Word16 xn[], /* (i) : Pitch target. */
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114 Word16 y1[], /* (i) : Filtered adaptive codebook. */
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115 Word16 L_subfr /* : Length of subframe. */
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116 );
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117 Word16 G_code ( /* out : Gain of innovation code. */
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118 Word16 xn[], /* in : target vector */
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119 Word16 y2[] /* in : filtered inovation vector */
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120 );
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121
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122 Word16 Interpol_6 ( /* (o) : interpolated value */
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123 Word16 *x, /* (i) : input vector */
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124 Word16 frac /* (i) : fraction */
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125 );
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126 void Int_lpc (
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127 Word16 lsp_old[], /* input: LSP vector at the 4th subfr. of past frame */
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128 Word16 lsp_mid[], /* input: LSP vector at the 2nd subfr. of
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129 present frame */
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130 Word16 lsp_new[], /* input: LSP vector at the 4th subfr. of
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131 present frame */
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132 Word16 Az[] /* output: interpolated LP parameters in all subfr. */
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133 );
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134 void Int_lpc2 (
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135 Word16 lsp_old[], /* input: LSP vector at the 4th subfr. of past frame */
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136 Word16 lsp_mid[], /* input: LSP vector at the 2nd subframe of
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137 present frame */
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138 Word16 lsp_new[], /* input: LSP vector at the 4th subframe of
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139 present frame */
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140 Word16 Az[] /* output:interpolated LP parameters
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141 in subframes 1 and 3 */
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142 );
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143 Word16 Pitch_fr6 ( /* (o) : pitch period. */
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144 Word16 exc[], /* (i) : excitation buffer */
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145 Word16 xn[], /* (i) : target vector */
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146 Word16 h[], /* (i) : impulse response of synthesis and
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147 weighting filters */
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148 Word16 L_subfr, /* (i) : Length of subframe */
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149 Word16 t0_min, /* (i) : minimum value in the searched range. */
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150 Word16 t0_max, /* (i) : maximum value in the searched range. */
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151 Word16 i_subfr, /* (i) : indicator for first subframe. */
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152 Word16 *pit_frac /* (o) : chosen fraction. */
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153 );
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154 Word16 Pitch_ol ( /* output: open loop pitch lag */
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155 Word16 signal[], /* input: signal used to compute the open loop pitch */
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156 /* signal[-pit_max] to signal[-1] should be known */
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157 Word16 pit_min, /* input : minimum pitch lag */
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158 Word16 pit_max, /* input : maximum pitch lag */
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159 Word16 L_frame /* input : length of frame to compute pitch */
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160 );
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161 void Pred_lt_6 (
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162 Word16 exc[], /* in/out: excitation buffer */
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163 Word16 T0, /* input : integer pitch lag */
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164 Word16 frac, /* input : fraction of lag */
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165 Word16 L_subfr /* input : subframe size */
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166 );
52
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167
39
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168 void Q_plsf_5 (
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169 struct EFR_encoder_state *st,
39
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170 Word16 *lsp1, /* input : 1st LSP vector */
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171 Word16 *lsp2, /* input : 2nd LSP vector */
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172 Word16 *lsp1_q, /* output: quantized 1st LSP vector */
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173 Word16 *lsp2_q, /* output: quantized 2nd LSP vector */
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174 Word16 *indice, /* output: quantization indices of 5 matrices */
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175 Word16 txdtx_ctrl /* input : tx dtx control word */
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176 );