Line data    Source code

       1             : /***********************************************************************
       2             : Copyright (c) 2006-2011, Skype Limited. All rights reserved.
       3             : Redistribution and use in source and binary forms, with or without
       4             : modification, are permitted provided that the following conditions
       5             : are met:
       6             : - Redistributions of source code must retain the above copyright notice,
       7             : this list of conditions and the following disclaimer.
       8             : - Redistributions in binary form must reproduce the above copyright
       9             : notice, this list of conditions and the following disclaimer in the
      10             : documentation and/or other materials provided with the distribution.
      11             : - Neither the name of Internet Society, IETF or IETF Trust, nor the
      12             : names of specific contributors, may be used to endorse or promote
      13             : products derived from this software without specific prior written
      14             : permission.
      15             : THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
      16             : AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
      17             : IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
      18             : ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
      19             : LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
      20             : CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
      21             : SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
      22             : INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
      23             : CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
      24             : ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
      25             : POSSIBILITY OF SUCH DAMAGE.
      26             : ***********************************************************************/
      27             : 
      28             : #ifdef HAVE_CONFIG_H
      29             : #include "config.h"
      30             : #endif
      31             : 
      32             : #include "main_FLP.h"
      33             : #include "tuning_parameters.h"
      34             : 
      35             : /* Processing of gains */
      36           0 : void silk_process_gains_FLP(
      37             :     silk_encoder_state_FLP          *psEnc,                             /* I/O  Encoder state FLP                           */
      38             :     silk_encoder_control_FLP        *psEncCtrl,                         /* I/O  Encoder control FLP                         */
      39             :     opus_int                        condCoding                          /* I    The type of conditional coding to use       */
      40             : )
      41             : {
      42           0 :     silk_shape_state_FLP *psShapeSt = &psEnc->sShape;
      43             :     opus_int     k;
      44             :     opus_int32   pGains_Q16[ MAX_NB_SUBFR ];
      45             :     silk_float   s, InvMaxSqrVal, gain, quant_offset;
      46             : 
      47             :     /* Gain reduction when LTP coding gain is high */
      48           0 :     if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) {
      49           0 :         s = 1.0f - 0.5f * silk_sigmoid( 0.25f * ( psEncCtrl->LTPredCodGain - 12.0f ) );
      50           0 :         for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) {
      51           0 :             psEncCtrl->Gains[ k ] *= s;
      52             :         }
      53             :     }
      54             : 
      55             :     /* Limit the quantized signal */
      56           0 :     InvMaxSqrVal = ( silk_float )( pow( 2.0f, 0.33f * ( 21.0f - psEnc->sCmn.SNR_dB_Q7 * ( 1 / 128.0f ) ) ) / psEnc->sCmn.subfr_length );
      57             : 
      58           0 :     for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) {
      59             :         /* Soft limit on ratio residual energy and squared gains */
      60           0 :         gain = psEncCtrl->Gains[ k ];
      61           0 :         gain = ( silk_float )sqrt( gain * gain + psEncCtrl->ResNrg[ k ] * InvMaxSqrVal );
      62           0 :         psEncCtrl->Gains[ k ] = silk_min_float( gain, 32767.0f );
      63             :     }
      64             : 
      65             :     /* Prepare gains for noise shaping quantization */
      66           0 :     for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) {
      67           0 :         pGains_Q16[ k ] = (opus_int32)( psEncCtrl->Gains[ k ] * 65536.0f );
      68             :     }
      69             : 
      70             :     /* Save unquantized gains and gain Index */
      71           0 :     silk_memcpy( psEncCtrl->GainsUnq_Q16, pGains_Q16, psEnc->sCmn.nb_subfr * sizeof( opus_int32 ) );
      72           0 :     psEncCtrl->lastGainIndexPrev = psShapeSt->LastGainIndex;
      73             : 
      74             :     /* Quantize gains */
      75           0 :     silk_gains_quant( psEnc->sCmn.indices.GainsIndices, pGains_Q16,
      76             :             &psShapeSt->LastGainIndex, condCoding == CODE_CONDITIONALLY, psEnc->sCmn.nb_subfr );
      77             : 
      78             :     /* Overwrite unquantized gains with quantized gains and convert back to Q0 from Q16 */
      79           0 :     for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) {
      80           0 :         psEncCtrl->Gains[ k ] = pGains_Q16[ k ] / 65536.0f;
      81             :     }
      82             : 
      83             :     /* Set quantizer offset for voiced signals. Larger offset when LTP coding gain is low or tilt is high (ie low-pass) */
      84           0 :     if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) {
      85           0 :         if( psEncCtrl->LTPredCodGain + psEnc->sCmn.input_tilt_Q15 * ( 1.0f / 32768.0f ) > 1.0f ) {
      86           0 :             psEnc->sCmn.indices.quantOffsetType = 0;
      87             :         } else {
      88           0 :             psEnc->sCmn.indices.quantOffsetType = 1;
      89             :         }
      90             :     }
      91             : 
      92             :     /* Quantizer boundary adjustment */
      93           0 :     quant_offset = silk_Quantization_Offsets_Q10[ psEnc->sCmn.indices.signalType >> 1 ][ psEnc->sCmn.indices.quantOffsetType ] / 1024.0f;
      94           0 :     psEncCtrl->Lambda = LAMBDA_OFFSET
      95           0 :                       + LAMBDA_DELAYED_DECISIONS * psEnc->sCmn.nStatesDelayedDecision
      96           0 :                       + LAMBDA_SPEECH_ACT        * psEnc->sCmn.speech_activity_Q8 * ( 1.0f /  256.0f )
      97           0 :                       + LAMBDA_INPUT_QUALITY     * psEncCtrl->input_quality
      98           0 :                       + LAMBDA_CODING_QUALITY    * psEncCtrl->coding_quality
      99           0 :                       + LAMBDA_QUANT_OFFSET      * quant_offset;
     100             : 
     101           0 :     silk_assert( psEncCtrl->Lambda > 0.0f );
     102           0 :     silk_assert( psEncCtrl->Lambda < 2.0f );
     103           0 : }