| /*********************************************************************** |
| Copyright (c) 2006-2011, Skype Limited. All rights reserved. |
| Redistribution and use in source and binary forms, with or without |
| modification, are permitted provided that the following conditions |
| are met: |
| - Redistributions of source code must retain the above copyright notice, |
| this list of conditions and the following disclaimer. |
| - Redistributions in binary form must reproduce the above copyright |
| notice, this list of conditions and the following disclaimer in the |
| documentation and/or other materials provided with the distribution. |
| - Neither the name of Internet Society, IETF or IETF Trust, nor the |
| names of specific contributors, may be used to endorse or promote |
| products derived from this software without specific prior written |
| permission. |
| THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
| LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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| POSSIBILITY OF SUCH DAMAGE. |
| ***********************************************************************/ |
| |
| #ifdef HAVE_CONFIG_H |
| #include "config.h" |
| #endif |
| |
| #include "main_FIX.h" |
| #include "tuning_parameters.h" |
| |
| /* Processing of gains */ |
| void silk_process_gains_FIX( |
| silk_encoder_state_FIX *psEnc, /* I/O Encoder state */ |
| silk_encoder_control_FIX *psEncCtrl, /* I/O Encoder control */ |
| opus_int condCoding /* I The type of conditional coding to use */ |
| ) |
| { |
| silk_shape_state_FIX *psShapeSt = &psEnc->sShape; |
| opus_int k; |
| opus_int32 s_Q16, InvMaxSqrVal_Q16, gain, gain_squared, ResNrg, ResNrgPart, quant_offset_Q10; |
| |
| /* Gain reduction when LTP coding gain is high */ |
| if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) { |
| /*s = -0.5f * silk_sigmoid( 0.25f * ( psEncCtrl->LTPredCodGain - 12.0f ) ); */ |
| s_Q16 = -silk_sigm_Q15( silk_RSHIFT_ROUND( psEncCtrl->LTPredCodGain_Q7 - SILK_FIX_CONST( 12.0, 7 ), 4 ) ); |
| for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) { |
| psEncCtrl->Gains_Q16[ k ] = silk_SMLAWB( psEncCtrl->Gains_Q16[ k ], psEncCtrl->Gains_Q16[ k ], s_Q16 ); |
| } |
| } |
| |
| /* Limit the quantized signal */ |
| /* InvMaxSqrVal = pow( 2.0f, 0.33f * ( 21.0f - SNR_dB ) ) / subfr_length; */ |
| InvMaxSqrVal_Q16 = silk_DIV32_16( silk_log2lin( |
| 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 ); |
| |
| for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) { |
| /* Soft limit on ratio residual energy and squared gains */ |
| ResNrg = psEncCtrl->ResNrg[ k ]; |
| ResNrgPart = silk_SMULWW( ResNrg, InvMaxSqrVal_Q16 ); |
| if( psEncCtrl->ResNrgQ[ k ] > 0 ) { |
| ResNrgPart = silk_RSHIFT_ROUND( ResNrgPart, psEncCtrl->ResNrgQ[ k ] ); |
| } else { |
| if( ResNrgPart >= silk_RSHIFT( silk_int32_MAX, -psEncCtrl->ResNrgQ[ k ] ) ) { |
| ResNrgPart = silk_int32_MAX; |
| } else { |
| ResNrgPart = silk_LSHIFT( ResNrgPart, -psEncCtrl->ResNrgQ[ k ] ); |
| } |
| } |
| gain = psEncCtrl->Gains_Q16[ k ]; |
| gain_squared = silk_ADD_SAT32( ResNrgPart, silk_SMMUL( gain, gain ) ); |
| if( gain_squared < silk_int16_MAX ) { |
| /* recalculate with higher precision */ |
| gain_squared = silk_SMLAWW( silk_LSHIFT( ResNrgPart, 16 ), gain, gain ); |
| silk_assert( gain_squared > 0 ); |
| gain = silk_SQRT_APPROX( gain_squared ); /* Q8 */ |
| gain = silk_min( gain, silk_int32_MAX >> 8 ); |
| psEncCtrl->Gains_Q16[ k ] = silk_LSHIFT_SAT32( gain, 8 ); /* Q16 */ |
| } else { |
| gain = silk_SQRT_APPROX( gain_squared ); /* Q0 */ |
| gain = silk_min( gain, silk_int32_MAX >> 16 ); |
| psEncCtrl->Gains_Q16[ k ] = silk_LSHIFT_SAT32( gain, 16 ); /* Q16 */ |
| } |
| } |
| |
| /* Save unquantized gains and gain Index */ |
| silk_memcpy( psEncCtrl->GainsUnq_Q16, psEncCtrl->Gains_Q16, psEnc->sCmn.nb_subfr * sizeof( opus_int32 ) ); |
| psEncCtrl->lastGainIndexPrev = psShapeSt->LastGainIndex; |
| |
| /* Quantize gains */ |
| silk_gains_quant( psEnc->sCmn.indices.GainsIndices, psEncCtrl->Gains_Q16, |
| &psShapeSt->LastGainIndex, condCoding == CODE_CONDITIONALLY, psEnc->sCmn.nb_subfr ); |
| |
| /* Set quantizer offset for voiced signals. Larger offset when LTP coding gain is low or tilt is high (ie low-pass) */ |
| if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) { |
| if( psEncCtrl->LTPredCodGain_Q7 + silk_RSHIFT( psEnc->sCmn.input_tilt_Q15, 8 ) > SILK_FIX_CONST( 1.0, 7 ) ) { |
| psEnc->sCmn.indices.quantOffsetType = 0; |
| } else { |
| psEnc->sCmn.indices.quantOffsetType = 1; |
| } |
| } |
| |
| /* Quantizer boundary adjustment */ |
| quant_offset_Q10 = silk_Quantization_Offsets_Q10[ psEnc->sCmn.indices.signalType >> 1 ][ psEnc->sCmn.indices.quantOffsetType ]; |
| psEncCtrl->Lambda_Q10 = SILK_FIX_CONST( LAMBDA_OFFSET, 10 ) |
| + silk_SMULBB( SILK_FIX_CONST( LAMBDA_DELAYED_DECISIONS, 10 ), psEnc->sCmn.nStatesDelayedDecision ) |
| + silk_SMULWB( SILK_FIX_CONST( LAMBDA_SPEECH_ACT, 18 ), psEnc->sCmn.speech_activity_Q8 ) |
| + silk_SMULWB( SILK_FIX_CONST( LAMBDA_INPUT_QUALITY, 12 ), psEncCtrl->input_quality_Q14 ) |
| + silk_SMULWB( SILK_FIX_CONST( LAMBDA_CODING_QUALITY, 12 ), psEncCtrl->coding_quality_Q14 ) |
| + silk_SMULWB( SILK_FIX_CONST( LAMBDA_QUANT_OFFSET, 16 ), quant_offset_Q10 ); |
| |
| silk_assert( psEncCtrl->Lambda_Q10 > 0 ); |
| silk_assert( psEncCtrl->Lambda_Q10 < SILK_FIX_CONST( 2, 10 ) ); |
| } |
