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+/***********************************************************************
+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
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "main_FLP.h"
+#include "tuning_parameters.h"
+
+/* Processing of gains */
+void silk_process_gains_FLP(
+ silk_encoder_state_FLP *psEnc, /* I/O Encoder state FLP */
+ silk_encoder_control_FLP *psEncCtrl, /* I/O Encoder control FLP */
+ opus_int condCoding /* I The type of conditional coding to use */
+)
+{
+ silk_shape_state_FLP *psShapeSt = &psEnc->sShape;
+ opus_int k;
+ opus_int32 pGains_Q16[ MAX_NB_SUBFR ];
+ silk_float s, InvMaxSqrVal, gain, quant_offset;
+
+ /* Gain reduction when LTP coding gain is high */
+ if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) {
+ s = 1.0f - 0.5f * silk_sigmoid( 0.25f * ( psEncCtrl->LTPredCodGain - 12.0f ) );
+ for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) {
+ psEncCtrl->Gains[ k ] *= s;
+ }
+ }
+
+ /* Limit the quantized signal */
+ InvMaxSqrVal = ( silk_float )( pow( 2.0f, 0.33f * ( 21.0f - psEnc->sCmn.SNR_dB_Q7 * ( 1 / 128.0f ) ) ) / psEnc->sCmn.subfr_length );
+
+ for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) {
+ /* Soft limit on ratio residual energy and squared gains */
+ gain = psEncCtrl->Gains[ k ];
+ gain = ( silk_float )sqrt( gain * gain + psEncCtrl->ResNrg[ k ] * InvMaxSqrVal );
+ psEncCtrl->Gains[ k ] = silk_min_float( gain, 32767.0f );
+ }
+
+ /* Prepare gains for noise shaping quantization */
+ for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) {
+ pGains_Q16[ k ] = (opus_int32)( psEncCtrl->Gains[ k ] * 65536.0f );
+ }
+
+ /* Save unquantized gains and gain Index */
+ silk_memcpy( psEncCtrl->GainsUnq_Q16, pGains_Q16, psEnc->sCmn.nb_subfr * sizeof( opus_int32 ) );
+ psEncCtrl->lastGainIndexPrev = psShapeSt->LastGainIndex;
+
+ /* Quantize gains */
+ silk_gains_quant( psEnc->sCmn.indices.GainsIndices, pGains_Q16,
+ &psShapeSt->LastGainIndex, condCoding == CODE_CONDITIONALLY, psEnc->sCmn.nb_subfr );
+
+ /* Overwrite unquantized gains with quantized gains and convert back to Q0 from Q16 */
+ for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) {
+ psEncCtrl->Gains[ k ] = pGains_Q16[ k ] / 65536.0f;
+ }
+
+ /* 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 + psEnc->sCmn.input_tilt_Q15 * ( 1.0f / 32768.0f ) > 1.0f ) {
+ psEnc->sCmn.indices.quantOffsetType = 0;
+ } else {
+ psEnc->sCmn.indices.quantOffsetType = 1;
+ }
+ }
+
+ /* Quantizer boundary adjustment */
+ quant_offset = silk_Quantization_Offsets_Q10[ psEnc->sCmn.indices.signalType >> 1 ][ psEnc->sCmn.indices.quantOffsetType ] / 1024.0f;
+ psEncCtrl->Lambda = LAMBDA_OFFSET
+ + LAMBDA_DELAYED_DECISIONS * psEnc->sCmn.nStatesDelayedDecision
+ + LAMBDA_SPEECH_ACT * psEnc->sCmn.speech_activity_Q8 * ( 1.0f / 256.0f )
+ + LAMBDA_INPUT_QUALITY * psEncCtrl->input_quality
+ + LAMBDA_CODING_QUALITY * psEncCtrl->coding_quality
+ + LAMBDA_QUANT_OFFSET * quant_offset;
+
+ silk_assert( psEncCtrl->Lambda > 0.0f );
+ silk_assert( psEncCtrl->Lambda < 2.0f );
+}