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annotate libtwamr/bgnscd.c @ 485:751f06541fbb

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doc/Codec-utils: clarify lack of DHF in gsmfr-decode-rb
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 20 May 2024 01:47:22 +0000
parents 8dfb7cbe6b59
children
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1 /*************************************************************************
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2 *
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3 * GSM AMR-NB speech codec R98 Version 7.6.0 December 12, 2001
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4 * R99 Version 3.3.0
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5 * REL-4 Version 4.1.0
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6 *
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7 ********************************************************************************
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8 *
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9 * File : bgnscd.c
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10 * Purpose : Background noise source charateristic detector (SCD)
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11 *
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12 ********************************************************************************
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13 */
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14
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15 /*
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16 ********************************************************************************
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17 * MODULE INCLUDE FILE AND VERSION ID
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18 ********************************************************************************
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19 */
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20 #include "namespace.h"
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21 #include "bgnscd.h"
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22
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23 #include "typedef.h"
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24 #include "basic_op.h"
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25 #include "no_count.h"
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26 #include "cnst.h"
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27 #include "memops.h"
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28 #include "gmed_n.h"
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29 #include "sqrt_l.h"
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30
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31 /*
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32 ********************************************************************************
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33 * LOCAL VARIABLES AND TABLES
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34 ********************************************************************************
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35 */
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36 /*-----------------------------------------------------------------*
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37 * Decoder constant parameters (defined in "cnst.h") *
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38 *-----------------------------------------------------------------*
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39 * L_FRAME : Frame size. *
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40 * L_SUBFR : Sub-frame size. *
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41 *-----------------------------------------------------------------*/
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42
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43 /*
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44 ********************************************************************************
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45 * PUBLIC PROGRAM CODE
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46 ********************************************************************************
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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 : Bgn_scd_reset
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52 * Purpose : Resets state memory
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53 *
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54 **************************************************************************
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55 */
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56 void Bgn_scd_reset (Bgn_scdState *state)
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57 {
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58 /* Static vectors to zero */
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59 Set_zero (state->frameEnergyHist, L_ENERGYHIST);
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60
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61 /* Initialize hangover handling */
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62 state->bgHangover = 0;
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63 }
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64
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65 /*
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66 **************************************************************************
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67 *
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68 * Function : Bgn_scd
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69 * Purpose : Charaterice synthesis speech and detect background noise
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70 * Returns : background noise decision; 0 = no bgn, 1 = bgn
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71 *
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72 **************************************************************************
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73 */
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74 Word16 Bgn_scd (Bgn_scdState *st, /* i : State variables for bgn SCD */
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75 Word16 ltpGainHist[], /* i : LTP gain history */
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76 Word16 speech[], /* o : synthesis speech frame */
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77 Word16 *voicedHangover /* o : # of frames after last
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78 voiced frame */
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79 )
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80 {
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81 Word16 i;
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82 Word16 prevVoiced, inbgNoise;
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83 Word16 temp;
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84 Word16 ltpLimit, frameEnergyMin;
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85 Word16 currEnergy, noiseFloor, maxEnergy, maxEnergyLastPart;
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86 Word32 s;
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87
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88 /* Update the inBackgroundNoise flag (valid for use in next frame if BFI) */
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89 /* it now works as a energy detector floating on top */
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90 /* not as good as a VAD. */
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91
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92 currEnergy = 0; move16 ();
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93 s = (Word32) 0; move32 ();
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94
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95 for (i = 0; i < L_FRAME; i++)
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96 {
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97 s = L_mac (s, speech[i], speech[i]);
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98 }
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99
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100 s = L_shl(s, 2);
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101
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102 currEnergy = extract_h (s);
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103
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104 frameEnergyMin = 32767; move16 ();
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105
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106 for (i = 0; i < L_ENERGYHIST; i++)
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107 {
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108 test ();
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109 if (sub(st->frameEnergyHist[i], frameEnergyMin) < 0)
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110 frameEnergyMin = st->frameEnergyHist[i]; move16 ();
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111 }
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112
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113 noiseFloor = shl (frameEnergyMin, 4); /* Frame Energy Margin of 16 */
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114
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115 maxEnergy = st->frameEnergyHist[0]; move16 ();
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116 for (i = 1; i < L_ENERGYHIST-4; i++)
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117 {
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118 test ();
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119 if ( sub (maxEnergy, st->frameEnergyHist[i]) < 0)
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120 {
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121 maxEnergy = st->frameEnergyHist[i]; move16 ();
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122 }
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123 }
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124
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125 maxEnergyLastPart = st->frameEnergyHist[2*L_ENERGYHIST/3]; move16 ();
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126 for (i = 2*L_ENERGYHIST/3+1; i < L_ENERGYHIST; i++)
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127 {
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diff changeset
128 test ();
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
129 if ( sub (maxEnergyLastPart, st->frameEnergyHist[i] ) < 0)
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
130 {
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
131 maxEnergyLastPart = st->frameEnergyHist[i]; move16 ();
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
132 }
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
133 }
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
134
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
135 inbgNoise = 0; /* false */ move16 ();
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
136
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
137 /* Do not consider silence as noise */
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
138 /* Do not consider continuous high volume as noise */
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
139 /* Or if the current noise level is very low */
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
140 /* Mark as noise if under current noise limit */
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
141 /* OR if the maximum energy is below the upper limit */
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
142
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
143 test (); test (); test (); test (); test ();
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
144 if ( (sub(maxEnergy, LOWERNOISELIMIT) > 0) &&
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
145 (sub(currEnergy, FRAMEENERGYLIMIT) < 0) &&
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
146 (sub(currEnergy, LOWERNOISELIMIT) > 0) &&
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
147 ( (sub(currEnergy, noiseFloor) < 0) ||
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
148 (sub(maxEnergyLastPart, UPPERNOISELIMIT) < 0)))
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
149 {
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
150 test ();
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
151 if (sub(add(st->bgHangover, 1), 30) > 0)
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
152 {
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
153 st->bgHangover = 30; move16 ();
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
154 } else
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
155 {
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
156 st->bgHangover = add(st->bgHangover, 1);
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
157 }
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
158 }
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
159 else
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
160 {
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
161 st->bgHangover = 0; move16 ();
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
162 }
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
163
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
164 /* make final decision about frame state , act somewhat cautiosly */
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
165 test ();
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
166 if (sub(st->bgHangover,1) > 0)
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
167 inbgNoise = 1; /* true */ move16 ();
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
168
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
169 for (i = 0; i < L_ENERGYHIST-1; i++)
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
170 {
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
171 st->frameEnergyHist[i] = st->frameEnergyHist[i+1]; move16 ();
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
172 }
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
173 st->frameEnergyHist[L_ENERGYHIST-1] = currEnergy; move16 ();
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
174
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
175 /* prepare for voicing decision; tighten the threshold after some
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
176 time in noise */
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
177 ltpLimit = 13926; /* 0.85 Q14 */ move16 ();
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
178 test ();
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
179 if (sub(st->bgHangover, 8) > 0)
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
180 {
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
181 ltpLimit = 15565; /* 0.95 Q14 */ move16 ();
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
182 }
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
183 test ();
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
184 if (sub(st->bgHangover, 15) > 0)
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
185 {
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
186 ltpLimit = 16383; /* 1.00 Q14 */ move16 ();
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
187 }
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
188
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
189 /* weak sort of voicing indication. */
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
190 prevVoiced = 0; /* false */ move16 ();
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
191 test ();
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
192
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
193 if (sub(gmed_n(&ltpGainHist[4], 5), ltpLimit) > 0)
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
194 {
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
195 prevVoiced = 1; /* true */ move16 ();
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
196 }
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
197 test ();
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
198 if (sub(st->bgHangover, 20) > 0) {
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
199 if (sub(gmed_n(ltpGainHist, 9), ltpLimit) > 0)
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
200 {
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
201 prevVoiced = 1; /* true */ move16 ();
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
202 }
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
203 else
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
204 {
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
205 prevVoiced = 0; /* false */ move16 ();
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
206 }
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
207 }
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
208
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
209 test ();
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
210 if (prevVoiced)
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
211 {
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
212 *voicedHangover = 0; move16 ();
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
213 }
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
214 else
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
215 {
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
216 temp = add(*voicedHangover, 1);
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
217 test ();
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
218 if (sub(temp, 10) > 0)
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
219 {
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
220 *voicedHangover = 10; move16 ();
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
221 }
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
222 else
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
223 {
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
224 *voicedHangover = temp; move16 ();
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
225 }
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
226 }
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
227
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
228 return inbgNoise;
8dfb7cbe6b59 libtwamr: integrated up to bgnscd.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
229 }