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4 modification, are permitted provided that the following conditions
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15 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
16 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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26 ***********************************************************************/
27
28 #ifdef HAVE_CONFIG_H
29 #include "config.h"
30 #endif
31
32 #include "main_FLP.h"
33 #include "tuning_parameters.h"
34
35 /* Processing of gains */
silk_process_gains_FLP(silk_encoder_state_FLP * psEnc,silk_encoder_control_FLP * psEncCtrl,opus_int condCoding)36 void silk_process_gains_FLP(
37 silk_encoder_state_FLP *psEnc, /* I/O Encoder state FLP */
38 silk_encoder_control_FLP *psEncCtrl, /* I/O Encoder control FLP */
39 opus_int condCoding /* I The type of conditional coding to use */
40 )
41 {
42 silk_shape_state_FLP *psShapeSt = &psEnc->sShape;
43 opus_int k;
44 opus_int32 pGains_Q16[ MAX_NB_SUBFR ];
45 silk_float s, InvMaxSqrVal, gain, quant_offset;
46
47 /* Gain reduction when LTP coding gain is high */
48 if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) {
49 s = 1.0f - 0.5f * silk_sigmoid( 0.25f * ( psEncCtrl->LTPredCodGain - 12.0f ) );
50 for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) {
51 psEncCtrl->Gains[ k ] *= s;
52 }
53 }
54
55 /* Limit the quantized signal */
56 InvMaxSqrVal = ( silk_float )( pow( 2.0f, 0.33f * ( 21.0f - psEnc->sCmn.SNR_dB_Q7 * ( 1 / 128.0f ) ) ) / psEnc->sCmn.subfr_length );
57
58 for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) {
59 /* Soft limit on ratio residual energy and squared gains */
60 gain = psEncCtrl->Gains[ k ];
61 gain = ( silk_float )sqrt( gain * gain + psEncCtrl->ResNrg[ k ] * InvMaxSqrVal );
62 psEncCtrl->Gains[ k ] = silk_min_float( gain, 32767.0f );
63 }
64
65 /* Prepare gains for noise shaping quantization */
66 for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) {
67 pGains_Q16[ k ] = (opus_int32)( psEncCtrl->Gains[ k ] * 65536.0f );
68 }
69
70 /* Save unquantized gains and gain Index */
71 silk_memcpy( psEncCtrl->GainsUnq_Q16, pGains_Q16, psEnc->sCmn.nb_subfr * sizeof( opus_int32 ) );
72 psEncCtrl->lastGainIndexPrev = psShapeSt->LastGainIndex;
73
74 /* Quantize gains */
75 silk_gains_quant( psEnc->sCmn.indices.GainsIndices, pGains_Q16,
76 &psShapeSt->LastGainIndex, condCoding == CODE_CONDITIONALLY, psEnc->sCmn.nb_subfr );
77
78 /* Overwrite unquantized gains with quantized gains and convert back to Q0 from Q16 */
79 for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) {
80 psEncCtrl->Gains[ k ] = pGains_Q16[ k ] / 65536.0f;
81 }
82
83 /* Set quantizer offset for voiced signals. Larger offset when LTP coding gain is low or tilt is high (ie low-pass) */
84 if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) {
85 if( psEncCtrl->LTPredCodGain + psEnc->sCmn.input_tilt_Q15 * ( 1.0f / 32768.0f ) > 1.0f ) {
86 psEnc->sCmn.indices.quantOffsetType = 0;
87 } else {
88 psEnc->sCmn.indices.quantOffsetType = 1;
89 }
90 }
91
92 /* Quantizer boundary adjustment */
93 quant_offset = silk_Quantization_Offsets_Q10[ psEnc->sCmn.indices.signalType >> 1 ][ psEnc->sCmn.indices.quantOffsetType ] / 1024.0f;
94 psEncCtrl->Lambda = LAMBDA_OFFSET
95 + LAMBDA_DELAYED_DECISIONS * psEnc->sCmn.nStatesDelayedDecision
96 + LAMBDA_SPEECH_ACT * psEnc->sCmn.speech_activity_Q8 * ( 1.0f / 256.0f )
97 + LAMBDA_INPUT_QUALITY * psEncCtrl->input_quality
98 + LAMBDA_CODING_QUALITY * psEncCtrl->coding_quality
99 + LAMBDA_QUANT_OFFSET * quant_offset;
100
101 silk_assert( psEncCtrl->Lambda > 0.0f );
102 silk_assert( psEncCtrl->Lambda < 2.0f );
103 }
104