The Tor Browser: media/libopus/silk/float/process_gains

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     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 ***********************************************************************/

    28 #ifdef HAVE_CONFIG_H

    29 #include "config.h"

    30 #endif

    32 #include "main_FLP.h"

    33 #include "tuning_parameters.h"

    35 /* Processing of gains */

    36 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     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;

    47     /* Gain reduction when LTP coding gain is high */

    48     if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) {

    49         s = 1.0f - 0.5f * silk_sigmoid( 0.25f * ( psEncCtrl->LTPredCodGain - 12.0f ) );

    50         for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) {

    51             psEncCtrl->Gains[ k ] *= s;

    52         }

    53     }

    55     /* Limit the quantized signal */

    56     InvMaxSqrVal = ( silk_float )( pow( 2.0f, 0.33f * ( 21.0f - psEnc->sCmn.SNR_dB_Q7 * ( 1 / 128.0f ) ) ) / psEnc->sCmn.subfr_length );

    58     for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) {

    59         /* Soft limit on ratio residual energy and squared gains */

    60         gain = psEncCtrl->Gains[ k ];

    61         gain = ( silk_float )sqrt( gain * gain + psEncCtrl->ResNrg[ k ] * InvMaxSqrVal );

    62         psEncCtrl->Gains[ k ] = silk_min_float( gain, 32767.0f );

    63     }

    65     /* Prepare gains for noise shaping quantization */

    66     for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) {

    67         pGains_Q16[ k ] = (opus_int32)( psEncCtrl->Gains[ k ] * 65536.0f );

    68     }

    70     /* Save unquantized gains and gain Index */

    71     silk_memcpy( psEncCtrl->GainsUnq_Q16, pGains_Q16, psEnc->sCmn.nb_subfr * sizeof( opus_int32 ) );

    72     psEncCtrl->lastGainIndexPrev = psShapeSt->LastGainIndex;

    74     /* Quantize gains */

    75     silk_gains_quant( psEnc->sCmn.indices.GainsIndices, pGains_Q16,

    76             &psShapeSt->LastGainIndex, condCoding == CODE_CONDITIONALLY, psEnc->sCmn.nb_subfr );

    78     /* Overwrite unquantized gains with quantized gains and convert back to Q0 from Q16 */

    79     for( k = 0; k < psEnc->sCmn.nb_subfr; k++ ) {

    80         psEncCtrl->Gains[ k ] = pGains_Q16[ k ] / 65536.0f;

    81     }

    83     /* Set quantizer offset for voiced signals. Larger offset when LTP coding gain is low or tilt is high (ie low-pass) */

    84     if( psEnc->sCmn.indices.signalType == TYPE_VOICED ) {

    85         if( psEncCtrl->LTPredCodGain + psEnc->sCmn.input_tilt_Q15 * ( 1.0f / 32768.0f ) > 1.0f ) {

    86             psEnc->sCmn.indices.quantOffsetType = 0;

    87         } else {

    88             psEnc->sCmn.indices.quantOffsetType = 1;

    89         }

    90     }

    92     /* Quantizer boundary adjustment */

    93     quant_offset = silk_Quantization_Offsets_Q10[ psEnc->sCmn.indices.signalType >> 1 ][ psEnc->sCmn.indices.quantOffsetType ] / 1024.0f;

    94     psEncCtrl->Lambda = LAMBDA_OFFSET

    95                       + LAMBDA_DELAYED_DECISIONS * psEnc->sCmn.nStatesDelayedDecision

    96                       + LAMBDA_SPEECH_ACT        * psEnc->sCmn.speech_activity_Q8 * ( 1.0f /  256.0f )

    97                       + LAMBDA_INPUT_QUALITY     * psEncCtrl->input_quality

    98                       + LAMBDA_CODING_QUALITY    * psEncCtrl->coding_quality

    99                       + LAMBDA_QUANT_OFFSET      * quant_offset;

   101     silk_assert( psEncCtrl->Lambda > 0.0f );

   102     silk_assert( psEncCtrl->Lambda < 2.0f );

   103 }

The Tor Browser / file revision