1 /*********************************************************************** 2 Copyright (c) 2006-2011, Skype Limited. All rights reserved. 3 Redistribution and use in source and binary forms, with or without 4 modification, are permitted provided that the following conditions 5 are met: 6 - Redistributions of source code must retain the above copyright notice, 7 this list of conditions and the following disclaimer. 8 - Redistributions in binary form must reproduce the above copyright 9 notice, this list of conditions and the following disclaimer in the 10 documentation and/or other materials provided with the distribution. 11 - Neither the name of Internet Society, IETF or IETF Trust, nor the 12 names of specific contributors, may be used to endorse or promote 13 products derived from this software without specific prior written 14 permission. 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 17 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 19 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 20 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 21 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 22 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 23 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 24 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 25 POSSIBILITY OF SUCH DAMAGE. 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 */ 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
