michael@0: /*********************************************************************** michael@0: Copyright (c) 2006-2011, Skype Limited. All rights reserved. michael@0: Redistribution and use in source and binary forms, with or without michael@0: modification, are permitted provided that the following conditions michael@0: are met: michael@0: - Redistributions of source code must retain the above copyright notice, michael@0: this list of conditions and the following disclaimer. michael@0: - Redistributions in binary form must reproduce the above copyright michael@0: notice, this list of conditions and the following disclaimer in the michael@0: documentation and/or other materials provided with the distribution. michael@0: - Neither the name of Internet Society, IETF or IETF Trust, nor the michael@0: names of specific contributors, may be used to endorse or promote michael@0: products derived from this software without specific prior written michael@0: permission. michael@0: THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" michael@0: AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE michael@0: IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE michael@0: ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE michael@0: LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR michael@0: CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF michael@0: SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS michael@0: INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN michael@0: CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) michael@0: ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE michael@0: POSSIBILITY OF SUCH DAMAGE. michael@0: ***********************************************************************/ michael@0: michael@0: #ifdef HAVE_CONFIG_H michael@0: #include "config.h" michael@0: #endif michael@0: michael@0: #include "main_FLP.h" michael@0: #include "tuning_parameters.h" michael@0: michael@0: /* Processing of gains */ michael@0: void silk_process_gains_FLP( michael@0: silk_encoder_state_FLP *psEnc, /* I/O Encoder state FLP */ michael@0: silk_encoder_control_FLP *psEncCtrl, /* I/O Encoder control FLP */ michael@0: opus_int condCoding /* I The type of conditional coding to use */ michael@0: ) michael@0: { michael@0: silk_shape_state_FLP *psShapeSt = &psEnc->sShape; michael@0: opus_int k; michael@0: opus_int32 pGains_Q16[ MAX_NB_SUBFR ]; michael@0: silk_float s, InvMaxSqrVal, gain, quant_offset; michael@0: michael@0: /* Gain reduction when LTP coding gain is high */ michael@0: if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) { michael@0: s = 1.0f - 0.5f * silk_sigmoid( 0.25f * ( psEncCtrl->LTPredCodGain - 12.0f ) ); michael@0: for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) { michael@0: psEncCtrl->Gains[ k ] *= s; michael@0: } michael@0: } michael@0: michael@0: /* Limit the quantized signal */ michael@0: InvMaxSqrVal = ( silk_float )( pow( 2.0f, 0.33f * ( 21.0f - psEnc->sCmn.SNR_dB_Q7 * ( 1 / 128.0f ) ) ) / psEnc->sCmn.subfr_length ); michael@0: michael@0: for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) { michael@0: /* Soft limit on ratio residual energy and squared gains */ michael@0: gain = psEncCtrl->Gains[ k ]; michael@0: gain = ( silk_float )sqrt( gain * gain + psEncCtrl->ResNrg[ k ] * InvMaxSqrVal ); michael@0: psEncCtrl->Gains[ k ] = silk_min_float( gain, 32767.0f ); michael@0: } michael@0: michael@0: /* Prepare gains for noise shaping quantization */ michael@0: for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) { michael@0: pGains_Q16[ k ] = (opus_int32)( psEncCtrl->Gains[ k ] * 65536.0f ); michael@0: } michael@0: michael@0: /* Save unquantized gains and gain Index */ michael@0: silk_memcpy( psEncCtrl->GainsUnq_Q16, pGains_Q16, psEnc->sCmn.nb_subfr * sizeof( opus_int32 ) ); michael@0: psEncCtrl->lastGainIndexPrev = psShapeSt->LastGainIndex; michael@0: michael@0: /* Quantize gains */ michael@0: silk_gains_quant( psEnc->sCmn.indices.GainsIndices, pGains_Q16, michael@0: &psShapeSt->LastGainIndex, condCoding == CODE_CONDITIONALLY, psEnc->sCmn.nb_subfr ); michael@0: michael@0: /* Overwrite unquantized gains with quantized gains and convert back to Q0 from Q16 */ michael@0: for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) { michael@0: psEncCtrl->Gains[ k ] = pGains_Q16[ k ] / 65536.0f; michael@0: } michael@0: michael@0: /* Set quantizer offset for voiced signals. Larger offset when LTP coding gain is low or tilt is high (ie low-pass) */ michael@0: if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) { michael@0: if( psEncCtrl->LTPredCodGain + psEnc->sCmn.input_tilt_Q15 * ( 1.0f / 32768.0f ) > 1.0f ) { michael@0: psEnc->sCmn.indices.quantOffsetType = 0; michael@0: } else { michael@0: psEnc->sCmn.indices.quantOffsetType = 1; michael@0: } michael@0: } michael@0: michael@0: /* Quantizer boundary adjustment */ michael@0: quant_offset = silk_Quantization_Offsets_Q10[ psEnc->sCmn.indices.signalType >> 1 ][ psEnc->sCmn.indices.quantOffsetType ] / 1024.0f; michael@0: psEncCtrl->Lambda = LAMBDA_OFFSET michael@0: + LAMBDA_DELAYED_DECISIONS * psEnc->sCmn.nStatesDelayedDecision michael@0: + LAMBDA_SPEECH_ACT * psEnc->sCmn.speech_activity_Q8 * ( 1.0f / 256.0f ) michael@0: + LAMBDA_INPUT_QUALITY * psEncCtrl->input_quality michael@0: + LAMBDA_CODING_QUALITY * psEncCtrl->coding_quality michael@0: + LAMBDA_QUANT_OFFSET * quant_offset; michael@0: michael@0: silk_assert( psEncCtrl->Lambda > 0.0f ); michael@0: silk_assert( psEncCtrl->Lambda < 2.0f ); michael@0: }