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ref: 6f06d3436dafe1f697eb86ace9cbfd645f0d2439
dir: /silk/silk_PLC.c/

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/***********************************************************************
Copyright (c) 2006-2011, Skype Limited. All rights reserved. 
Redistribution and use in source and binary forms, with or without 
modification, (subject to the limitations in the disclaimer below) 
are permitted provided that the following conditions are met:
- Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
- Redistributions in binary form must reproduce the above copyright 
notice, this list of conditions and the following disclaimer in the 
documentation and/or other materials provided with the distribution.
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this software without specific prior written permission.
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BY THIS LICENSE. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 
CONTRIBUTORS ''AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND 
FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 
COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
***********************************************************************/

#include "silk_main.h"
#include "silk_PLC.h"

#define NB_ATT 2
static const SKP_int16 HARM_ATT_Q15[NB_ATT]              = { 32440, 31130 }; /* 0.99, 0.95 */
static const SKP_int16 PLC_RAND_ATTENUATE_V_Q15[NB_ATT]  = { 31130, 26214 }; /* 0.95, 0.8 */
static const SKP_int16 PLC_RAND_ATTENUATE_UV_Q15[NB_ATT] = { 32440, 29491 }; /* 0.99, 0.9 */

void silk_PLC_Reset(
    silk_decoder_state      *psDec              /* I/O Decoder state        */
)
{
    psDec->sPLC.pitchL_Q8 = SKP_RSHIFT( psDec->frame_length, 1 );
}

void silk_PLC(
    silk_decoder_state          *psDec,             /* I Decoder state          */
    silk_decoder_control        *psDecCtrl,         /* I Decoder control        */
    SKP_int16                   signal[],           /* O Concealed signal       */
    SKP_int                     length,             /* I length of residual     */
    SKP_int                     lost                /* I Loss flag              */
)
{
    /* PLC control function */
    if( psDec->fs_kHz != psDec->sPLC.fs_kHz ) {
        silk_PLC_Reset( psDec );
        psDec->sPLC.fs_kHz = psDec->fs_kHz;
    }

    if( lost ) {
        /****************************/
        /* Generate Signal          */
        /****************************/
        silk_PLC_conceal( psDec, psDecCtrl, signal, length );

        psDec->lossCnt++;
    } else {
        /****************************/
        /* Update state             */
        /****************************/
        silk_PLC_update( psDec, psDecCtrl, signal, length );
    }
}

/**************************************************/
/* Update state of PLC                            */
/**************************************************/
void silk_PLC_update(
    silk_decoder_state          *psDec,             /* (I/O) Decoder state          */
    silk_decoder_control        *psDecCtrl,         /* (I/O) Decoder control        */
    SKP_int16                   signal[],
    SKP_int                     length
)
{
    SKP_int32 LTP_Gain_Q14, temp_LTP_Gain_Q14;
    SKP_int   i, j;
    silk_PLC_struct *psPLC;

    psPLC = &psDec->sPLC;

    /* Update parameters used in case of packet loss */
    psDec->prevSignalType = psDec->indices.signalType;
    LTP_Gain_Q14 = 0;
    if( psDec->indices.signalType == TYPE_VOICED ) {
        /* Find the parameters for the last subframe which contains a pitch pulse */
        for( j = 0; j * psDec->subfr_length < psDecCtrl->pitchL[ psDec->nb_subfr - 1 ]; j++ ) {
            if( j == psDec->nb_subfr ){
                break;
            }
            temp_LTP_Gain_Q14 = 0;
            for( i = 0; i < LTP_ORDER; i++ ) {
                temp_LTP_Gain_Q14 += psDecCtrl->LTPCoef_Q14[ ( psDec->nb_subfr - 1 - j ) * LTP_ORDER  + i ];
            }
            if( temp_LTP_Gain_Q14 > LTP_Gain_Q14 ) {
                LTP_Gain_Q14 = temp_LTP_Gain_Q14;
                SKP_memcpy( psPLC->LTPCoef_Q14,
                    &psDecCtrl->LTPCoef_Q14[ SKP_SMULBB( psDec->nb_subfr - 1 - j, LTP_ORDER ) ],
                    LTP_ORDER * sizeof( SKP_int16 ) );

                psPLC->pitchL_Q8 = SKP_LSHIFT( psDecCtrl->pitchL[ psDec->nb_subfr - 1 - j ], 8 );
            }
        }

#if USE_SINGLE_TAP
        SKP_memset( psPLC->LTPCoef_Q14, 0, LTP_ORDER * sizeof( SKP_int16 ) );
        psPLC->LTPCoef_Q14[ LTP_ORDER / 2 ] = LTP_Gain_Q14;
#endif

        /* Limit LT coefs */
        if( LTP_Gain_Q14 < V_PITCH_GAIN_START_MIN_Q14 ) {
            SKP_int   scale_Q10;
            SKP_int32 tmp;

            tmp = SKP_LSHIFT( V_PITCH_GAIN_START_MIN_Q14, 10 );
            scale_Q10 = SKP_DIV32( tmp, SKP_max( LTP_Gain_Q14, 1 ) );
            for( i = 0; i < LTP_ORDER; i++ ) {
                psPLC->LTPCoef_Q14[ i ] = SKP_RSHIFT( SKP_SMULBB( psPLC->LTPCoef_Q14[ i ], scale_Q10 ), 10 );
            }
        } else if( LTP_Gain_Q14 > V_PITCH_GAIN_START_MAX_Q14 ) {
            SKP_int   scale_Q14;
            SKP_int32 tmp;

            tmp = SKP_LSHIFT( V_PITCH_GAIN_START_MAX_Q14, 14 );
            scale_Q14 = SKP_DIV32( tmp, SKP_max( LTP_Gain_Q14, 1 ) );
            for( i = 0; i < LTP_ORDER; i++ ) {
                psPLC->LTPCoef_Q14[ i ] = SKP_RSHIFT( SKP_SMULBB( psPLC->LTPCoef_Q14[ i ], scale_Q14 ), 14 );
            }
        }
    } else {
        psPLC->pitchL_Q8 = SKP_LSHIFT( SKP_SMULBB( psDec->fs_kHz, 18 ), 8 );
        SKP_memset( psPLC->LTPCoef_Q14, 0, LTP_ORDER * sizeof( SKP_int16 ));
    }

    /* Save LPC coeficients */
    SKP_memcpy( psPLC->prevLPC_Q12, psDecCtrl->PredCoef_Q12[ 1 ], psDec->LPC_order * sizeof( SKP_int16 ) );
    psPLC->prevLTP_scale_Q14 = psDecCtrl->LTP_scale_Q14;

    /* Save Gains */
    SKP_memcpy( psPLC->prevGain_Q16, psDecCtrl->Gains_Q16, psDec->nb_subfr * sizeof( SKP_int32 ) );
}

void silk_PLC_conceal(
    silk_decoder_state          *psDec,             /* I/O Decoder state */
    silk_decoder_control        *psDecCtrl,         /* I/O Decoder control */
    SKP_int16                   signal[],           /* O concealed signal */
    SKP_int                     length              /* I length of residual */
)
{
    SKP_int   i, j, k;
    SKP_int16 *B_Q14, exc_buf[ MAX_FRAME_LENGTH ], *exc_buf_ptr;
    SKP_int16 rand_scale_Q14, A_Q12_tmp[ MAX_LPC_ORDER ];
    SKP_int32 rand_seed, harm_Gain_Q15, rand_Gain_Q15;
    SKP_int   lag, idx, sLTP_buf_idx, shift1, shift2;
    SKP_int32 energy1, energy2, *rand_ptr, *pred_lag_ptr;
    SKP_int32 sig_Q10[ MAX_FRAME_LENGTH ], *sig_Q10_ptr, LPC_exc_Q10, LPC_pred_Q10,  LTP_pred_Q14;
    silk_PLC_struct *psPLC;
    psPLC = &psDec->sPLC;

    /* Update LTP buffer */
    SKP_memmove( psDec->sLTP_Q16, &psDec->sLTP_Q16[ psDec->frame_length ], psDec->ltp_mem_length * sizeof( SKP_int32 ) );

    /* LPC concealment. Apply BWE to previous LPC */
    silk_bwexpander( psPLC->prevLPC_Q12, psDec->LPC_order, SILK_FIX_CONST( BWE_COEF, 16 ) );

    /* Find random noise component */
    /* Scale previous excitation signal */
    exc_buf_ptr = exc_buf;
    /* FIXME: JMV: Is this the right fix? */
    for (i=0;i<MAX_FRAME_LENGTH;i++)
    	exc_buf[i] = 0;
    for( k = ( psDec->nb_subfr >> 1 ); k < psDec->nb_subfr; k++ ) {
        for( i = 0; i < psDec->subfr_length; i++ ) {
            exc_buf_ptr[ i ] = ( SKP_int16 )SKP_RSHIFT( 
                SKP_SMULWW( psDec->exc_Q10[ i + k * psDec->subfr_length ], psPLC->prevGain_Q16[ k ] ), 10 );
        }
        exc_buf_ptr += psDec->subfr_length;
    }
    /* Find the subframe with lowest energy of the last two and use that as random noise generator */ 
    silk_sum_sqr_shift( &energy1, &shift1, exc_buf,                         psDec->subfr_length );
    silk_sum_sqr_shift( &energy2, &shift2, &exc_buf[ psDec->subfr_length ], psDec->subfr_length );
        
    if( SKP_RSHIFT( energy1, shift2 ) < SKP_RSHIFT( energy2, shift1 ) ) {
        /* First sub-frame has lowest energy */
        rand_ptr = &psDec->exc_Q10[ SKP_max_int( 0, 3 * psDec->subfr_length - RAND_BUF_SIZE ) ];
    } else {
        /* Second sub-frame has lowest energy */
        rand_ptr = &psDec->exc_Q10[ SKP_max_int( 0, psDec->frame_length - RAND_BUF_SIZE ) ];
    }

    /* Setup Gain to random noise component */ 
    B_Q14          = psPLC->LTPCoef_Q14;
    rand_scale_Q14 = psPLC->randScale_Q14;

    /* Setup attenuation gains */
    harm_Gain_Q15 = HARM_ATT_Q15[ SKP_min_int( NB_ATT - 1, psDec->lossCnt ) ];
    if( psDec->prevSignalType == TYPE_VOICED ) {
        rand_Gain_Q15 = PLC_RAND_ATTENUATE_V_Q15[  SKP_min_int( NB_ATT - 1, psDec->lossCnt ) ];
    } else {
        rand_Gain_Q15 = PLC_RAND_ATTENUATE_UV_Q15[ SKP_min_int( NB_ATT - 1, psDec->lossCnt ) ];
    }

    /* First Lost frame */
    if( psDec->lossCnt == 0 ) {
        rand_scale_Q14 = 1 << 14;
    
        /* Reduce random noise Gain for voiced frames */
        if( psDec->prevSignalType == TYPE_VOICED ) {
            for( i = 0; i < LTP_ORDER; i++ ) {
                rand_scale_Q14 -= B_Q14[ i ];
            }
            rand_scale_Q14 = SKP_max_16( 3277, rand_scale_Q14 ); /* 0.2 */
            rand_scale_Q14 = ( SKP_int16 )SKP_RSHIFT( SKP_SMULBB( rand_scale_Q14, psPLC->prevLTP_scale_Q14 ), 14 );
        } else {
            /* Reduce random noise for unvoiced frames with high LPC gain */
            SKP_int32 invGain_Q30, down_scale_Q30;
            
            silk_LPC_inverse_pred_gain( &invGain_Q30, psPLC->prevLPC_Q12, psDec->LPC_order );
            
            down_scale_Q30 = SKP_min_32( SKP_RSHIFT( 1 << 30, LOG2_INV_LPC_GAIN_HIGH_THRES ), invGain_Q30 );
            down_scale_Q30 = SKP_max_32( SKP_RSHIFT( 1 << 30, LOG2_INV_LPC_GAIN_LOW_THRES ), down_scale_Q30 );
            down_scale_Q30 = SKP_LSHIFT( down_scale_Q30, LOG2_INV_LPC_GAIN_HIGH_THRES );
            
            rand_Gain_Q15 = SKP_RSHIFT( SKP_SMULWB( down_scale_Q30, rand_Gain_Q15 ), 14 );
        }
    }

    rand_seed    = psPLC->rand_seed;
    lag          = SKP_RSHIFT_ROUND( psPLC->pitchL_Q8, 8 );
    sLTP_buf_idx = psDec->ltp_mem_length;

    /***************************/
    /* LTP synthesis filtering */
    /***************************/
    sig_Q10_ptr = sig_Q10;
    for( k = 0; k < psDec->nb_subfr; k++ ) {
        /* Setup pointer */
        pred_lag_ptr = &psDec->sLTP_Q16[ sLTP_buf_idx - lag + LTP_ORDER / 2 ];
        for( i = 0; i < psDec->subfr_length; i++ ) {
            rand_seed = SKP_RAND( rand_seed );
            idx = SKP_RSHIFT( rand_seed, 25 ) & RAND_BUF_MASK;

            /* Unrolled loop */
            LTP_pred_Q14 = SKP_SMULWB(               pred_lag_ptr[  0 ], B_Q14[ 0 ] );
            LTP_pred_Q14 = SKP_SMLAWB( LTP_pred_Q14, pred_lag_ptr[ -1 ], B_Q14[ 1 ] );
            LTP_pred_Q14 = SKP_SMLAWB( LTP_pred_Q14, pred_lag_ptr[ -2 ], B_Q14[ 2 ] );
            LTP_pred_Q14 = SKP_SMLAWB( LTP_pred_Q14, pred_lag_ptr[ -3 ], B_Q14[ 3 ] );
            LTP_pred_Q14 = SKP_SMLAWB( LTP_pred_Q14, pred_lag_ptr[ -4 ], B_Q14[ 4 ] );
            pred_lag_ptr++;
            
            /* Generate LPC residual */
            LPC_exc_Q10 = SKP_LSHIFT( SKP_SMULWB( rand_ptr[ idx ], rand_scale_Q14 ), 2 ); /* Random noise part */
            LPC_exc_Q10 = SKP_ADD32( LPC_exc_Q10, SKP_RSHIFT_ROUND( LTP_pred_Q14, 4 ) );  /* Harmonic part */
            
            /* Update states */
            psDec->sLTP_Q16[ sLTP_buf_idx ] = SKP_LSHIFT( LPC_exc_Q10, 6 );
            sLTP_buf_idx++;
                
            /* Save LPC residual */
            sig_Q10_ptr[ i ] = LPC_exc_Q10;
        }
        sig_Q10_ptr += psDec->subfr_length;
        /* Gradually reduce LTP gain */
        for( j = 0; j < LTP_ORDER; j++ ) {
            B_Q14[ j ] = SKP_RSHIFT( SKP_SMULBB( harm_Gain_Q15, B_Q14[ j ] ), 15 );
        }
        /* Gradually reduce excitation gain */
        rand_scale_Q14 = SKP_RSHIFT( SKP_SMULBB( rand_scale_Q14, rand_Gain_Q15 ), 15 );

        /* Slowly increase pitch lag */
        psPLC->pitchL_Q8 += SKP_SMULWB( psPLC->pitchL_Q8, PITCH_DRIFT_FAC_Q16 );
        psPLC->pitchL_Q8 = SKP_min_32( psPLC->pitchL_Q8, SKP_LSHIFT( SKP_SMULBB( MAX_PITCH_LAG_MS, psDec->fs_kHz ), 8 ) );
        lag = SKP_RSHIFT_ROUND( psPLC->pitchL_Q8, 8 );
    }

    /***************************/
    /* LPC synthesis filtering */
    /***************************/
    sig_Q10_ptr = sig_Q10;
    /* Preload LPC coeficients to array on stack. Gives small performance gain */
    SKP_memcpy( A_Q12_tmp, psPLC->prevLPC_Q12, psDec->LPC_order * sizeof( SKP_int16 ) );
    SKP_assert( psDec->LPC_order >= 10 ); /* check that unrolling works */
    for( k = 0; k < psDec->nb_subfr; k++ ) {
        for( i = 0; i < psDec->subfr_length; i++ ){
            /* partly unrolled */
            LPC_pred_Q10 = SKP_SMULWB(               psDec->sLPC_Q14[ MAX_LPC_ORDER + i -  1 ], A_Q12_tmp[ 0 ] );
            LPC_pred_Q10 = SKP_SMLAWB( LPC_pred_Q10, psDec->sLPC_Q14[ MAX_LPC_ORDER + i -  2 ], A_Q12_tmp[ 1 ] );
            LPC_pred_Q10 = SKP_SMLAWB( LPC_pred_Q10, psDec->sLPC_Q14[ MAX_LPC_ORDER + i -  3 ], A_Q12_tmp[ 2 ] );
            LPC_pred_Q10 = SKP_SMLAWB( LPC_pred_Q10, psDec->sLPC_Q14[ MAX_LPC_ORDER + i -  4 ], A_Q12_tmp[ 3 ] );
            LPC_pred_Q10 = SKP_SMLAWB( LPC_pred_Q10, psDec->sLPC_Q14[ MAX_LPC_ORDER + i -  5 ], A_Q12_tmp[ 4 ] );
            LPC_pred_Q10 = SKP_SMLAWB( LPC_pred_Q10, psDec->sLPC_Q14[ MAX_LPC_ORDER + i -  6 ], A_Q12_tmp[ 5 ] );
            LPC_pred_Q10 = SKP_SMLAWB( LPC_pred_Q10, psDec->sLPC_Q14[ MAX_LPC_ORDER + i -  7 ], A_Q12_tmp[ 6 ] );
            LPC_pred_Q10 = SKP_SMLAWB( LPC_pred_Q10, psDec->sLPC_Q14[ MAX_LPC_ORDER + i -  8 ], A_Q12_tmp[ 7 ] );
            LPC_pred_Q10 = SKP_SMLAWB( LPC_pred_Q10, psDec->sLPC_Q14[ MAX_LPC_ORDER + i -  9 ], A_Q12_tmp[ 8 ] );
            LPC_pred_Q10 = SKP_SMLAWB( LPC_pred_Q10, psDec->sLPC_Q14[ MAX_LPC_ORDER + i - 10 ], A_Q12_tmp[ 9 ] );

            for( j = 10; j < psDec->LPC_order; j++ ) {
                LPC_pred_Q10 = SKP_SMLAWB( LPC_pred_Q10, psDec->sLPC_Q14[ MAX_LPC_ORDER + i - j - 1 ], A_Q12_tmp[ j ] );
            }

            /* Add prediction to LPC residual */
            sig_Q10_ptr[ i ] = SKP_ADD32( sig_Q10_ptr[ i ], LPC_pred_Q10 );
                
            /* Update states */
            psDec->sLPC_Q14[ MAX_LPC_ORDER + i ] = SKP_LSHIFT( sig_Q10_ptr[ i ], 4 );
        }
        sig_Q10_ptr += psDec->subfr_length;
        /* Update LPC filter state */
        SKP_memcpy( psDec->sLPC_Q14, &psDec->sLPC_Q14[ psDec->subfr_length ], MAX_LPC_ORDER * sizeof( SKP_int32 ) );
    }

    /* Scale with Gain */
    for( i = 0; i < psDec->frame_length; i++ ) {
        signal[ i ] = ( SKP_int16 )SKP_SAT16( SKP_RSHIFT_ROUND( SKP_SMULWW( sig_Q10[ i ], psPLC->prevGain_Q16[ psDec->nb_subfr - 1 ] ), 10 ) );
    }

    /**************************************/
    /* Update states                      */
    /**************************************/
    psPLC->rand_seed     = rand_seed;
    psPLC->randScale_Q14 = rand_scale_Q14;
    for( i = 0; i < MAX_NB_SUBFR; i++ ) {
        psDecCtrl->pitchL[ i ] = lag;
    }
}

/* Glues concealed frames with new good recieved frames             */
void silk_PLC_glue_frames(
    silk_decoder_state          *psDec,             /* I/O decoder state    */
    silk_decoder_control        *psDecCtrl,         /* I/O Decoder control  */
    SKP_int16                   signal[],           /* I/O signal           */
    SKP_int                     length              /* I length of residual */
)
{
    SKP_int   i, energy_shift;
    SKP_int32 energy;
    silk_PLC_struct *psPLC;
    psPLC = &psDec->sPLC;

    if( psDec->lossCnt ) {
        /* Calculate energy in concealed residual */
        silk_sum_sqr_shift( &psPLC->conc_energy, &psPLC->conc_energy_shift, signal, length );
        
        psPLC->last_frame_lost = 1;
    } else {
        if( psDec->sPLC.last_frame_lost ) {
            /* Calculate residual in decoded signal if last frame was lost */
            silk_sum_sqr_shift( &energy, &energy_shift, signal, length );

            /* Normalize energies */
            if( energy_shift > psPLC->conc_energy_shift ) {
                psPLC->conc_energy = SKP_RSHIFT( psPLC->conc_energy, energy_shift - psPLC->conc_energy_shift );
            } else if( energy_shift < psPLC->conc_energy_shift ) {
                energy = SKP_RSHIFT( energy, psPLC->conc_energy_shift - energy_shift );
            }

            /* Fade in the energy difference */
            if( energy > psPLC->conc_energy ) {
                SKP_int32 frac_Q24, LZ;
                SKP_int32 gain_Q16, slope_Q16;

                LZ = silk_CLZ32( psPLC->conc_energy );
                LZ = LZ - 1;
                psPLC->conc_energy = SKP_LSHIFT( psPLC->conc_energy, LZ );
                energy = SKP_RSHIFT( energy, SKP_max_32( 24 - LZ, 0 ) );
                
                frac_Q24 = SKP_DIV32( psPLC->conc_energy, SKP_max( energy, 1 ) );
                
                gain_Q16 = SKP_LSHIFT( silk_SQRT_APPROX( frac_Q24 ), 4 );
                slope_Q16 = SKP_DIV32_16( ( 1 << 16 ) - gain_Q16, length );
				/* Make slope 4x steeper to avoid missing onsets after DTX */
                slope_Q16 = SKP_LSHIFT( slope_Q16, 2 );

                for( i = 0; i < length; i++ ) {
                    signal[ i ] = SKP_SMULWB( gain_Q16, signal[ i ] );
                    gain_Q16 += slope_Q16;
                    if( gain_Q16 > 1 << 16 ) {
                        break;
                    }
                }
            }
        }
        psPLC->last_frame_lost = 0;
    }
}