cannam@154: /*********************************************************************** cannam@154: Copyright (c) 2006-2011, Skype Limited. All rights reserved. cannam@154: Redistribution and use in source and binary forms, with or without cannam@154: modification, are permitted provided that the following conditions cannam@154: are met: cannam@154: - Redistributions of source code must retain the above copyright notice, cannam@154: this list of conditions and the following disclaimer. cannam@154: - Redistributions in binary form must reproduce the above copyright cannam@154: notice, this list of conditions and the following disclaimer in the cannam@154: documentation and/or other materials provided with the distribution. cannam@154: - Neither the name of Internet Society, IETF or IETF Trust, nor the cannam@154: names of specific contributors, may be used to endorse or promote cannam@154: products derived from this software without specific prior written cannam@154: permission. cannam@154: THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" cannam@154: AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE cannam@154: IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE cannam@154: ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE cannam@154: LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR cannam@154: CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF cannam@154: SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS cannam@154: INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN cannam@154: CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) cannam@154: ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE cannam@154: POSSIBILITY OF SUCH DAMAGE. cannam@154: ***********************************************************************/ cannam@154: cannam@154: #ifdef HAVE_CONFIG_H cannam@154: #include "config.h" cannam@154: #endif cannam@154: cannam@154: #include "main_FLP.h" cannam@154: #include "tuning_parameters.h" cannam@154: cannam@154: /* Processing of gains */ cannam@154: void silk_process_gains_FLP( cannam@154: silk_encoder_state_FLP *psEnc, /* I/O Encoder state FLP */ cannam@154: silk_encoder_control_FLP *psEncCtrl, /* I/O Encoder control FLP */ cannam@154: opus_int condCoding /* I The type of conditional coding to use */ cannam@154: ) cannam@154: { cannam@154: silk_shape_state_FLP *psShapeSt = &psEnc->sShape; cannam@154: opus_int k; cannam@154: opus_int32 pGains_Q16[ MAX_NB_SUBFR ]; cannam@154: silk_float s, InvMaxSqrVal, gain, quant_offset; cannam@154: cannam@154: /* Gain reduction when LTP coding gain is high */ cannam@154: if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) { cannam@154: s = 1.0f - 0.5f * silk_sigmoid( 0.25f * ( psEncCtrl->LTPredCodGain - 12.0f ) ); cannam@154: for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) { cannam@154: psEncCtrl->Gains[ k ] *= s; cannam@154: } cannam@154: } cannam@154: cannam@154: /* Limit the quantized signal */ cannam@154: InvMaxSqrVal = ( silk_float )( pow( 2.0f, 0.33f * ( 21.0f - psEnc->sCmn.SNR_dB_Q7 * ( 1 / 128.0f ) ) ) / psEnc->sCmn.subfr_length ); cannam@154: cannam@154: for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) { cannam@154: /* Soft limit on ratio residual energy and squared gains */ cannam@154: gain = psEncCtrl->Gains[ k ]; cannam@154: gain = ( silk_float )sqrt( gain * gain + psEncCtrl->ResNrg[ k ] * InvMaxSqrVal ); cannam@154: psEncCtrl->Gains[ k ] = silk_min_float( gain, 32767.0f ); cannam@154: } cannam@154: cannam@154: /* Prepare gains for noise shaping quantization */ cannam@154: for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) { cannam@154: pGains_Q16[ k ] = (opus_int32)( psEncCtrl->Gains[ k ] * 65536.0f ); cannam@154: } cannam@154: cannam@154: /* Save unquantized gains and gain Index */ cannam@154: silk_memcpy( psEncCtrl->GainsUnq_Q16, pGains_Q16, psEnc->sCmn.nb_subfr * sizeof( opus_int32 ) ); cannam@154: psEncCtrl->lastGainIndexPrev = psShapeSt->LastGainIndex; cannam@154: cannam@154: /* Quantize gains */ cannam@154: silk_gains_quant( psEnc->sCmn.indices.GainsIndices, pGains_Q16, cannam@154: &psShapeSt->LastGainIndex, condCoding == CODE_CONDITIONALLY, psEnc->sCmn.nb_subfr ); cannam@154: cannam@154: /* Overwrite unquantized gains with quantized gains and convert back to Q0 from Q16 */ cannam@154: for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) { cannam@154: psEncCtrl->Gains[ k ] = pGains_Q16[ k ] / 65536.0f; cannam@154: } cannam@154: cannam@154: /* Set quantizer offset for voiced signals. Larger offset when LTP coding gain is low or tilt is high (ie low-pass) */ cannam@154: if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) { cannam@154: if( psEncCtrl->LTPredCodGain + psEnc->sCmn.input_tilt_Q15 * ( 1.0f / 32768.0f ) > 1.0f ) { cannam@154: psEnc->sCmn.indices.quantOffsetType = 0; cannam@154: } else { cannam@154: psEnc->sCmn.indices.quantOffsetType = 1; cannam@154: } cannam@154: } cannam@154: cannam@154: /* Quantizer boundary adjustment */ cannam@154: quant_offset = silk_Quantization_Offsets_Q10[ psEnc->sCmn.indices.signalType >> 1 ][ psEnc->sCmn.indices.quantOffsetType ] / 1024.0f; cannam@154: psEncCtrl->Lambda = LAMBDA_OFFSET cannam@154: + LAMBDA_DELAYED_DECISIONS * psEnc->sCmn.nStatesDelayedDecision cannam@154: + LAMBDA_SPEECH_ACT * psEnc->sCmn.speech_activity_Q8 * ( 1.0f / 256.0f ) cannam@154: + LAMBDA_INPUT_QUALITY * psEncCtrl->input_quality cannam@154: + LAMBDA_CODING_QUALITY * psEncCtrl->coding_quality cannam@154: + LAMBDA_QUANT_OFFSET * quant_offset; cannam@154: cannam@154: silk_assert( psEncCtrl->Lambda > 0.0f ); cannam@154: silk_assert( psEncCtrl->Lambda < 2.0f ); cannam@154: }