109 lines
5.9 KiB
C
109 lines
5.9 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 "SKP_Silk_main_FIX.h"
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#include "SKP_Silk_tuning_parameters.h"
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/* Processing of gains */
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void SKP_Silk_process_gains_FIX(
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SKP_Silk_encoder_state_FIX *psEnc, /* I/O Encoder state_FIX */
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SKP_Silk_encoder_control_FIX *psEncCtrl /* I/O Encoder control_FIX */
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)
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{
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SKP_Silk_shape_state_FIX *psShapeSt = &psEnc->sShape;
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SKP_int k;
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SKP_int32 s_Q16, InvMaxSqrVal_Q16, gain, gain_squared, ResNrg, ResNrgPart, quant_offset_Q10;
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/* Gain reduction when LTP coding gain is high */
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if( psEncCtrl->sCmn.sigtype == SIG_TYPE_VOICED ) {
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/*s = -0.5f * SKP_sigmoid( 0.25f * ( psEncCtrl->LTPredCodGain - 12.0f ) ); */
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s_Q16 = -SKP_Silk_sigm_Q15( SKP_RSHIFT_ROUND( psEncCtrl->LTPredCodGain_Q7 - SKP_FIX_CONST( 12.0, 7 ), 4 ) );
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for( k = 0; k < NB_SUBFR; k++ ) {
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psEncCtrl->Gains_Q16[ k ] = SKP_SMLAWB( psEncCtrl->Gains_Q16[ k ], psEncCtrl->Gains_Q16[ k ], s_Q16 );
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}
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}
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/* Limit the quantized signal */
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InvMaxSqrVal_Q16 = SKP_DIV32_16( SKP_Silk_log2lin(
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SKP_SMULWB( SKP_FIX_CONST( 70.0, 7 ) - psEncCtrl->current_SNR_dB_Q7, SKP_FIX_CONST( 0.33, 16 ) ) ), psEnc->sCmn.subfr_length );
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for( k = 0; k < NB_SUBFR; k++ ) {
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/* Soft limit on ratio residual energy and squared gains */
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ResNrg = psEncCtrl->ResNrg[ k ];
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ResNrgPart = SKP_SMULWW( ResNrg, InvMaxSqrVal_Q16 );
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if( psEncCtrl->ResNrgQ[ k ] > 0 ) {
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if( psEncCtrl->ResNrgQ[ k ] < 32 ) {
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ResNrgPart = SKP_RSHIFT_ROUND( ResNrgPart, psEncCtrl->ResNrgQ[ k ] );
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} else {
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ResNrgPart = 0;
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}
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} else if( psEncCtrl->ResNrgQ[k] != 0 ) {
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if( ResNrgPart > SKP_RSHIFT( SKP_int32_MAX, -psEncCtrl->ResNrgQ[ k ] ) ) {
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ResNrgPart = SKP_int32_MAX;
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} else {
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ResNrgPart = SKP_LSHIFT( ResNrgPart, -psEncCtrl->ResNrgQ[ k ] );
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}
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}
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gain = psEncCtrl->Gains_Q16[ k ];
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gain_squared = SKP_ADD_SAT32( ResNrgPart, SKP_SMMUL( gain, gain ) );
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if( gain_squared < SKP_int16_MAX ) {
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/* recalculate with higher precision */
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gain_squared = SKP_SMLAWW( SKP_LSHIFT( ResNrgPart, 16 ), gain, gain );
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SKP_assert( gain_squared > 0 );
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gain = SKP_Silk_SQRT_APPROX( gain_squared ); /* Q8 */
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psEncCtrl->Gains_Q16[ k ] = SKP_LSHIFT_SAT32( gain, 8 ); /* Q16 */
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} else {
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gain = SKP_Silk_SQRT_APPROX( gain_squared ); /* Q0 */
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psEncCtrl->Gains_Q16[ k ] = SKP_LSHIFT_SAT32( gain, 16 ); /* Q16 */
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}
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}
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/* Noise shaping quantization */
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SKP_Silk_gains_quant( psEncCtrl->sCmn.GainsIndices, psEncCtrl->Gains_Q16,
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&psShapeSt->LastGainIndex, psEnc->sCmn.nFramesInPayloadBuf );
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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( psEncCtrl->sCmn.sigtype == SIG_TYPE_VOICED ) {
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if( psEncCtrl->LTPredCodGain_Q7 + SKP_RSHIFT( psEncCtrl->input_tilt_Q15, 8 ) > SKP_FIX_CONST( 1.0, 7 ) ) {
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psEncCtrl->sCmn.QuantOffsetType = 0;
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} else {
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psEncCtrl->sCmn.QuantOffsetType = 1;
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}
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}
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/* Quantizer boundary adjustment */
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quant_offset_Q10 = SKP_Silk_Quantization_Offsets_Q10[ psEncCtrl->sCmn.sigtype ][ psEncCtrl->sCmn.QuantOffsetType ];
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psEncCtrl->Lambda_Q10 = SKP_FIX_CONST( LAMBDA_OFFSET, 10 )
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+ SKP_SMULBB( SKP_FIX_CONST( LAMBDA_DELAYED_DECISIONS, 10 ), psEnc->sCmn.nStatesDelayedDecision )
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+ SKP_SMULWB( SKP_FIX_CONST( LAMBDA_SPEECH_ACT, 18 ), psEnc->speech_activity_Q8 )
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+ SKP_SMULWB( SKP_FIX_CONST( LAMBDA_INPUT_QUALITY, 12 ), psEncCtrl->input_quality_Q14 )
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+ SKP_SMULWB( SKP_FIX_CONST( LAMBDA_CODING_QUALITY, 12 ), psEncCtrl->coding_quality_Q14 )
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+ SKP_SMULWB( SKP_FIX_CONST( LAMBDA_QUANT_OFFSET, 16 ), quant_offset_Q10 );
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SKP_assert( psEncCtrl->Lambda_Q10 > 0 );
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SKP_assert( psEncCtrl->Lambda_Q10 < SKP_FIX_CONST( 2, 10 ) );
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}
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