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