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3 Redistribution and use in source and binary forms, with or without
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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18 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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26 ***********************************************************************/
27
28 #ifdef HAVE_CONFIG_H
29 #include "config.h"
30 #endif
31
32 #include "main_FIX.h"
33 #include "tuning_parameters.h"
34
35 /* Processing of gains */
silk_process_gains_FIX(silk_encoder_state_FIX * psEnc,silk_encoder_control_FIX * psEncCtrl,opus_int condCoding)36 void silk_process_gains_FIX(
37 silk_encoder_state_FIX *psEnc, /* I/O Encoder state */
38 silk_encoder_control_FIX *psEncCtrl, /* I/O Encoder control */
39 opus_int condCoding /* I The type of conditional coding to use */
40 )
41 {
42 silk_shape_state_FIX *psShapeSt = &psEnc->sShape;
43 opus_int k;
44 opus_int32 s_Q16, InvMaxSqrVal_Q16, gain, gain_squared, ResNrg, ResNrgPart, quant_offset_Q10;
45
46 /* Gain reduction when LTP coding gain is high */
47 if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) {
48 /*s = -0.5f * silk_sigmoid( 0.25f * ( psEncCtrl->LTPredCodGain - 12.0f ) ); */
49 s_Q16 = -silk_sigm_Q15( silk_RSHIFT_ROUND( psEncCtrl->LTPredCodGain_Q7 - SILK_FIX_CONST( 12.0, 7 ), 4 ) );
50 for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) {
51 psEncCtrl->Gains_Q16[ k ] = silk_SMLAWB( psEncCtrl->Gains_Q16[ k ], psEncCtrl->Gains_Q16[ k ], s_Q16 );
52 }
53 }
54
55 /* Limit the quantized signal */
56 /* InvMaxSqrVal = pow( 2.0f, 0.33f * ( 21.0f - SNR_dB ) ) / subfr_length; */
57 InvMaxSqrVal_Q16 = silk_DIV32_16( silk_log2lin(
58 silk_SMULWB( SILK_FIX_CONST( 21 + 16 / 0.33, 7 ) - psEnc->sCmn.SNR_dB_Q7, SILK_FIX_CONST( 0.33, 16 ) ) ), psEnc->sCmn.subfr_length );
59
60 for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) {
61 /* Soft limit on ratio residual energy and squared gains */
62 ResNrg = psEncCtrl->ResNrg[ k ];
63 ResNrgPart = silk_SMULWW( ResNrg, InvMaxSqrVal_Q16 );
64 if( psEncCtrl->ResNrgQ[ k ] > 0 ) {
65 ResNrgPart = silk_RSHIFT_ROUND( ResNrgPart, psEncCtrl->ResNrgQ[ k ] );
66 } else {
67 if( ResNrgPart >= silk_RSHIFT( silk_int32_MAX, -psEncCtrl->ResNrgQ[ k ] ) ) {
68 ResNrgPart = silk_int32_MAX;
69 } else {
70 ResNrgPart = silk_LSHIFT( ResNrgPart, -psEncCtrl->ResNrgQ[ k ] );
71 }
72 }
73 gain = psEncCtrl->Gains_Q16[ k ];
74 gain_squared = silk_ADD_SAT32( ResNrgPart, silk_SMMUL( gain, gain ) );
75 if( gain_squared < silk_int16_MAX ) {
76 /* recalculate with higher precision */
77 gain_squared = silk_SMLAWW( silk_LSHIFT( ResNrgPart, 16 ), gain, gain );
78 silk_assert( gain_squared > 0 );
79 gain = silk_SQRT_APPROX( gain_squared ); /* Q8 */
80 gain = silk_min( gain, silk_int32_MAX >> 8 );
81 psEncCtrl->Gains_Q16[ k ] = silk_LSHIFT_SAT32( gain, 8 ); /* Q16 */
82 } else {
83 gain = silk_SQRT_APPROX( gain_squared ); /* Q0 */
84 gain = silk_min( gain, silk_int32_MAX >> 16 );
85 psEncCtrl->Gains_Q16[ k ] = silk_LSHIFT_SAT32( gain, 16 ); /* Q16 */
86 }
87 }
88
89 /* Save unquantized gains and gain Index */
90 silk_memcpy( psEncCtrl->GainsUnq_Q16, psEncCtrl->Gains_Q16, psEnc->sCmn.nb_subfr * sizeof( opus_int32 ) );
91 psEncCtrl->lastGainIndexPrev = psShapeSt->LastGainIndex;
92
93 /* Quantize gains */
94 silk_gains_quant( psEnc->sCmn.indices.GainsIndices, psEncCtrl->Gains_Q16,
95 &psShapeSt->LastGainIndex, condCoding == CODE_CONDITIONALLY, psEnc->sCmn.nb_subfr );
96
97 /* Set quantizer offset for voiced signals. Larger offset when LTP coding gain is low or tilt is high (ie low-pass) */
98 if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) {
99 if( psEncCtrl->LTPredCodGain_Q7 + silk_RSHIFT( psEnc->sCmn.input_tilt_Q15, 8 ) > SILK_FIX_CONST( 1.0, 7 ) ) {
100 psEnc->sCmn.indices.quantOffsetType = 0;
101 } else {
102 psEnc->sCmn.indices.quantOffsetType = 1;
103 }
104 }
105
106 /* Quantizer boundary adjustment */
107 quant_offset_Q10 = silk_Quantization_Offsets_Q10[ psEnc->sCmn.indices.signalType >> 1 ][ psEnc->sCmn.indices.quantOffsetType ];
108 psEncCtrl->Lambda_Q10 = SILK_FIX_CONST( LAMBDA_OFFSET, 10 )
109 + silk_SMULBB( SILK_FIX_CONST( LAMBDA_DELAYED_DECISIONS, 10 ), psEnc->sCmn.nStatesDelayedDecision )
110 + silk_SMULWB( SILK_FIX_CONST( LAMBDA_SPEECH_ACT, 18 ), psEnc->sCmn.speech_activity_Q8 )
111 + silk_SMULWB( SILK_FIX_CONST( LAMBDA_INPUT_QUALITY, 12 ), psEncCtrl->input_quality_Q14 )
112 + silk_SMULWB( SILK_FIX_CONST( LAMBDA_CODING_QUALITY, 12 ), psEncCtrl->coding_quality_Q14 )
113 + silk_SMULWB( SILK_FIX_CONST( LAMBDA_QUANT_OFFSET, 16 ), quant_offset_Q10 );
114
115 silk_assert( psEncCtrl->Lambda_Q10 > 0 );
116 silk_assert( psEncCtrl->Lambda_Q10 < SILK_FIX_CONST( 2, 10 ) );
117 }
118