448 lines
20 KiB
C
448 lines
20 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, are permitted provided that the following conditions
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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 Internet Society, IETF or IETF Trust, nor the
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names of specific contributors, may be used to endorse or promote
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products derived from this software without specific prior written
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permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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***********************************************************************/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "main.h"
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#include "stack_alloc.h"
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#include "PLC.h"
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#define NB_ATT 2
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static const opus_int16 HARM_ATT_Q15[NB_ATT] = { 32440, 31130 }; /* 0.99, 0.95 */
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static const opus_int16 PLC_RAND_ATTENUATE_V_Q15[NB_ATT] = { 31130, 26214 }; /* 0.95, 0.8 */
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static const opus_int16 PLC_RAND_ATTENUATE_UV_Q15[NB_ATT] = { 32440, 29491 }; /* 0.99, 0.9 */
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static OPUS_INLINE void silk_PLC_update(
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silk_decoder_state *psDec, /* I/O Decoder state */
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silk_decoder_control *psDecCtrl /* I/O Decoder control */
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);
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static OPUS_INLINE void silk_PLC_conceal(
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silk_decoder_state *psDec, /* I/O Decoder state */
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silk_decoder_control *psDecCtrl, /* I/O Decoder control */
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opus_int16 frame[], /* O LPC residual signal */
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int arch /* I Run-time architecture */
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);
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void silk_PLC_Reset(
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silk_decoder_state *psDec /* I/O Decoder state */
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)
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{
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psDec->sPLC.pitchL_Q8 = silk_LSHIFT( psDec->frame_length, 8 - 1 );
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psDec->sPLC.prevGain_Q16[ 0 ] = SILK_FIX_CONST( 1, 16 );
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psDec->sPLC.prevGain_Q16[ 1 ] = SILK_FIX_CONST( 1, 16 );
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psDec->sPLC.subfr_length = 20;
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psDec->sPLC.nb_subfr = 2;
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}
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void silk_PLC(
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silk_decoder_state *psDec, /* I/O Decoder state */
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silk_decoder_control *psDecCtrl, /* I/O Decoder control */
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opus_int16 frame[], /* I/O signal */
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opus_int lost, /* I Loss flag */
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int arch /* I Run-time architecture */
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)
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{
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/* PLC control function */
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if( psDec->fs_kHz != psDec->sPLC.fs_kHz ) {
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silk_PLC_Reset( psDec );
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psDec->sPLC.fs_kHz = psDec->fs_kHz;
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}
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if( lost ) {
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/****************************/
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/* Generate Signal */
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/****************************/
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silk_PLC_conceal( psDec, psDecCtrl, frame, arch );
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psDec->lossCnt++;
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} else {
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/****************************/
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/* Update state */
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/****************************/
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silk_PLC_update( psDec, psDecCtrl );
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}
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}
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/**************************************************/
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/* Update state of PLC */
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/**************************************************/
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static OPUS_INLINE void silk_PLC_update(
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silk_decoder_state *psDec, /* I/O Decoder state */
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silk_decoder_control *psDecCtrl /* I/O Decoder control */
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)
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{
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opus_int32 LTP_Gain_Q14, temp_LTP_Gain_Q14;
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opus_int i, j;
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silk_PLC_struct *psPLC;
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psPLC = &psDec->sPLC;
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/* Update parameters used in case of packet loss */
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psDec->prevSignalType = psDec->indices.signalType;
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LTP_Gain_Q14 = 0;
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if( psDec->indices.signalType == TYPE_VOICED ) {
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/* Find the parameters for the last subframe which contains a pitch pulse */
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for( j = 0; j * psDec->subfr_length < psDecCtrl->pitchL[ psDec->nb_subfr - 1 ]; j++ ) {
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if( j == psDec->nb_subfr ) {
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break;
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}
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temp_LTP_Gain_Q14 = 0;
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for( i = 0; i < LTP_ORDER; i++ ) {
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temp_LTP_Gain_Q14 += psDecCtrl->LTPCoef_Q14[ ( psDec->nb_subfr - 1 - j ) * LTP_ORDER + i ];
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}
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if( temp_LTP_Gain_Q14 > LTP_Gain_Q14 ) {
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LTP_Gain_Q14 = temp_LTP_Gain_Q14;
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silk_memcpy( psPLC->LTPCoef_Q14,
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&psDecCtrl->LTPCoef_Q14[ silk_SMULBB( psDec->nb_subfr - 1 - j, LTP_ORDER ) ],
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LTP_ORDER * sizeof( opus_int16 ) );
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psPLC->pitchL_Q8 = silk_LSHIFT( psDecCtrl->pitchL[ psDec->nb_subfr - 1 - j ], 8 );
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}
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}
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silk_memset( psPLC->LTPCoef_Q14, 0, LTP_ORDER * sizeof( opus_int16 ) );
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psPLC->LTPCoef_Q14[ LTP_ORDER / 2 ] = LTP_Gain_Q14;
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/* Limit LT coefs */
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if( LTP_Gain_Q14 < V_PITCH_GAIN_START_MIN_Q14 ) {
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opus_int scale_Q10;
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opus_int32 tmp;
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tmp = silk_LSHIFT( V_PITCH_GAIN_START_MIN_Q14, 10 );
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scale_Q10 = silk_DIV32( tmp, silk_max( LTP_Gain_Q14, 1 ) );
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for( i = 0; i < LTP_ORDER; i++ ) {
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psPLC->LTPCoef_Q14[ i ] = silk_RSHIFT( silk_SMULBB( psPLC->LTPCoef_Q14[ i ], scale_Q10 ), 10 );
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}
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} else if( LTP_Gain_Q14 > V_PITCH_GAIN_START_MAX_Q14 ) {
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opus_int scale_Q14;
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opus_int32 tmp;
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tmp = silk_LSHIFT( V_PITCH_GAIN_START_MAX_Q14, 14 );
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scale_Q14 = silk_DIV32( tmp, silk_max( LTP_Gain_Q14, 1 ) );
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for( i = 0; i < LTP_ORDER; i++ ) {
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psPLC->LTPCoef_Q14[ i ] = silk_RSHIFT( silk_SMULBB( psPLC->LTPCoef_Q14[ i ], scale_Q14 ), 14 );
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}
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}
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} else {
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psPLC->pitchL_Q8 = silk_LSHIFT( silk_SMULBB( psDec->fs_kHz, 18 ), 8 );
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silk_memset( psPLC->LTPCoef_Q14, 0, LTP_ORDER * sizeof( opus_int16 ));
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}
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/* Save LPC coeficients */
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silk_memcpy( psPLC->prevLPC_Q12, psDecCtrl->PredCoef_Q12[ 1 ], psDec->LPC_order * sizeof( opus_int16 ) );
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psPLC->prevLTP_scale_Q14 = psDecCtrl->LTP_scale_Q14;
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/* Save last two gains */
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silk_memcpy( psPLC->prevGain_Q16, &psDecCtrl->Gains_Q16[ psDec->nb_subfr - 2 ], 2 * sizeof( opus_int32 ) );
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psPLC->subfr_length = psDec->subfr_length;
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psPLC->nb_subfr = psDec->nb_subfr;
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}
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static OPUS_INLINE void silk_PLC_energy(opus_int32 *energy1, opus_int *shift1, opus_int32 *energy2, opus_int *shift2,
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const opus_int32 *exc_Q14, const opus_int32 *prevGain_Q10, int subfr_length, int nb_subfr)
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{
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int i, k;
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VARDECL( opus_int16, exc_buf );
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opus_int16 *exc_buf_ptr;
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SAVE_STACK;
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ALLOC( exc_buf, 2*subfr_length, opus_int16 );
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/* Find random noise component */
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/* Scale previous excitation signal */
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exc_buf_ptr = exc_buf;
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for( k = 0; k < 2; k++ ) {
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for( i = 0; i < subfr_length; i++ ) {
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exc_buf_ptr[ i ] = (opus_int16)silk_SAT16( silk_RSHIFT(
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silk_SMULWW( exc_Q14[ i + ( k + nb_subfr - 2 ) * subfr_length ], prevGain_Q10[ k ] ), 8 ) );
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}
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exc_buf_ptr += subfr_length;
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}
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/* Find the subframe with lowest energy of the last two and use that as random noise generator */
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silk_sum_sqr_shift( energy1, shift1, exc_buf, subfr_length );
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silk_sum_sqr_shift( energy2, shift2, &exc_buf[ subfr_length ], subfr_length );
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RESTORE_STACK;
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}
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static OPUS_INLINE void silk_PLC_conceal(
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silk_decoder_state *psDec, /* I/O Decoder state */
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silk_decoder_control *psDecCtrl, /* I/O Decoder control */
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opus_int16 frame[], /* O LPC residual signal */
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int arch /* I Run-time architecture */
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)
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{
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opus_int i, j, k;
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opus_int lag, idx, sLTP_buf_idx, shift1, shift2;
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opus_int32 rand_seed, harm_Gain_Q15, rand_Gain_Q15, inv_gain_Q30;
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opus_int32 energy1, energy2, *rand_ptr, *pred_lag_ptr;
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opus_int32 LPC_pred_Q10, LTP_pred_Q12;
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opus_int16 rand_scale_Q14;
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opus_int16 *B_Q14;
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opus_int32 *sLPC_Q14_ptr;
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opus_int16 A_Q12[ MAX_LPC_ORDER ];
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#ifdef SMALL_FOOTPRINT
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opus_int16 *sLTP;
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#else
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VARDECL( opus_int16, sLTP );
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#endif
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VARDECL( opus_int32, sLTP_Q14 );
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silk_PLC_struct *psPLC = &psDec->sPLC;
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opus_int32 prevGain_Q10[2];
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SAVE_STACK;
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ALLOC( sLTP_Q14, psDec->ltp_mem_length + psDec->frame_length, opus_int32 );
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#ifdef SMALL_FOOTPRINT
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/* Ugly hack that breaks aliasing rules to save stack: put sLTP at the very end of sLTP_Q14. */
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sLTP = ((opus_int16*)&sLTP_Q14[psDec->ltp_mem_length + psDec->frame_length])-psDec->ltp_mem_length;
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#else
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ALLOC( sLTP, psDec->ltp_mem_length, opus_int16 );
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#endif
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prevGain_Q10[0] = silk_RSHIFT( psPLC->prevGain_Q16[ 0 ], 6);
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prevGain_Q10[1] = silk_RSHIFT( psPLC->prevGain_Q16[ 1 ], 6);
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if( psDec->first_frame_after_reset ) {
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silk_memset( psPLC->prevLPC_Q12, 0, sizeof( psPLC->prevLPC_Q12 ) );
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}
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silk_PLC_energy(&energy1, &shift1, &energy2, &shift2, psDec->exc_Q14, prevGain_Q10, psDec->subfr_length, psDec->nb_subfr);
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if( silk_RSHIFT( energy1, shift2 ) < silk_RSHIFT( energy2, shift1 ) ) {
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/* First sub-frame has lowest energy */
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rand_ptr = &psDec->exc_Q14[ silk_max_int( 0, ( psPLC->nb_subfr - 1 ) * psPLC->subfr_length - RAND_BUF_SIZE ) ];
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} else {
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/* Second sub-frame has lowest energy */
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rand_ptr = &psDec->exc_Q14[ silk_max_int( 0, psPLC->nb_subfr * psPLC->subfr_length - RAND_BUF_SIZE ) ];
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}
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/* Set up Gain to random noise component */
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B_Q14 = psPLC->LTPCoef_Q14;
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rand_scale_Q14 = psPLC->randScale_Q14;
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/* Set up attenuation gains */
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harm_Gain_Q15 = HARM_ATT_Q15[ silk_min_int( NB_ATT - 1, psDec->lossCnt ) ];
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if( psDec->prevSignalType == TYPE_VOICED ) {
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rand_Gain_Q15 = PLC_RAND_ATTENUATE_V_Q15[ silk_min_int( NB_ATT - 1, psDec->lossCnt ) ];
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} else {
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rand_Gain_Q15 = PLC_RAND_ATTENUATE_UV_Q15[ silk_min_int( NB_ATT - 1, psDec->lossCnt ) ];
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}
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/* LPC concealment. Apply BWE to previous LPC */
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silk_bwexpander( psPLC->prevLPC_Q12, psDec->LPC_order, SILK_FIX_CONST( BWE_COEF, 16 ) );
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/* Preload LPC coeficients to array on stack. Gives small performance gain */
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silk_memcpy( A_Q12, psPLC->prevLPC_Q12, psDec->LPC_order * sizeof( opus_int16 ) );
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/* First Lost frame */
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if( psDec->lossCnt == 0 ) {
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rand_scale_Q14 = 1 << 14;
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/* Reduce random noise Gain for voiced frames */
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if( psDec->prevSignalType == TYPE_VOICED ) {
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for( i = 0; i < LTP_ORDER; i++ ) {
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rand_scale_Q14 -= B_Q14[ i ];
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}
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rand_scale_Q14 = silk_max_16( 3277, rand_scale_Q14 ); /* 0.2 */
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rand_scale_Q14 = (opus_int16)silk_RSHIFT( silk_SMULBB( rand_scale_Q14, psPLC->prevLTP_scale_Q14 ), 14 );
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} else {
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/* Reduce random noise for unvoiced frames with high LPC gain */
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opus_int32 invGain_Q30, down_scale_Q30;
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invGain_Q30 = silk_LPC_inverse_pred_gain( psPLC->prevLPC_Q12, psDec->LPC_order, arch );
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down_scale_Q30 = silk_min_32( silk_RSHIFT( (opus_int32)1 << 30, LOG2_INV_LPC_GAIN_HIGH_THRES ), invGain_Q30 );
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down_scale_Q30 = silk_max_32( silk_RSHIFT( (opus_int32)1 << 30, LOG2_INV_LPC_GAIN_LOW_THRES ), down_scale_Q30 );
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down_scale_Q30 = silk_LSHIFT( down_scale_Q30, LOG2_INV_LPC_GAIN_HIGH_THRES );
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rand_Gain_Q15 = silk_RSHIFT( silk_SMULWB( down_scale_Q30, rand_Gain_Q15 ), 14 );
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}
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}
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rand_seed = psPLC->rand_seed;
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lag = silk_RSHIFT_ROUND( psPLC->pitchL_Q8, 8 );
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sLTP_buf_idx = psDec->ltp_mem_length;
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/* Rewhiten LTP state */
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idx = psDec->ltp_mem_length - lag - psDec->LPC_order - LTP_ORDER / 2;
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celt_assert( idx > 0 );
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silk_LPC_analysis_filter( &sLTP[ idx ], &psDec->outBuf[ idx ], A_Q12, psDec->ltp_mem_length - idx, psDec->LPC_order, arch );
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/* Scale LTP state */
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inv_gain_Q30 = silk_INVERSE32_varQ( psPLC->prevGain_Q16[ 1 ], 46 );
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inv_gain_Q30 = silk_min( inv_gain_Q30, silk_int32_MAX >> 1 );
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for( i = idx + psDec->LPC_order; i < psDec->ltp_mem_length; i++ ) {
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sLTP_Q14[ i ] = silk_SMULWB( inv_gain_Q30, sLTP[ i ] );
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}
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/***************************/
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/* LTP synthesis filtering */
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/***************************/
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for( k = 0; k < psDec->nb_subfr; k++ ) {
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/* Set up pointer */
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pred_lag_ptr = &sLTP_Q14[ sLTP_buf_idx - lag + LTP_ORDER / 2 ];
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for( i = 0; i < psDec->subfr_length; i++ ) {
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/* Unrolled loop */
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/* Avoids introducing a bias because silk_SMLAWB() always rounds to -inf */
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LTP_pred_Q12 = 2;
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LTP_pred_Q12 = silk_SMLAWB( LTP_pred_Q12, pred_lag_ptr[ 0 ], B_Q14[ 0 ] );
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LTP_pred_Q12 = silk_SMLAWB( LTP_pred_Q12, pred_lag_ptr[ -1 ], B_Q14[ 1 ] );
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LTP_pred_Q12 = silk_SMLAWB( LTP_pred_Q12, pred_lag_ptr[ -2 ], B_Q14[ 2 ] );
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LTP_pred_Q12 = silk_SMLAWB( LTP_pred_Q12, pred_lag_ptr[ -3 ], B_Q14[ 3 ] );
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LTP_pred_Q12 = silk_SMLAWB( LTP_pred_Q12, pred_lag_ptr[ -4 ], B_Q14[ 4 ] );
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pred_lag_ptr++;
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/* Generate LPC excitation */
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rand_seed = silk_RAND( rand_seed );
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idx = silk_RSHIFT( rand_seed, 25 ) & RAND_BUF_MASK;
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sLTP_Q14[ sLTP_buf_idx ] = silk_LSHIFT32( silk_SMLAWB( LTP_pred_Q12, rand_ptr[ idx ], rand_scale_Q14 ), 2 );
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sLTP_buf_idx++;
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}
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/* Gradually reduce LTP gain */
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for( j = 0; j < LTP_ORDER; j++ ) {
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B_Q14[ j ] = silk_RSHIFT( silk_SMULBB( harm_Gain_Q15, B_Q14[ j ] ), 15 );
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}
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if ( psDec->indices.signalType != TYPE_NO_VOICE_ACTIVITY ) {
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/* Gradually reduce excitation gain */
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rand_scale_Q14 = silk_RSHIFT( silk_SMULBB( rand_scale_Q14, rand_Gain_Q15 ), 15 );
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}
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/* Slowly increase pitch lag */
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psPLC->pitchL_Q8 = silk_SMLAWB( psPLC->pitchL_Q8, psPLC->pitchL_Q8, PITCH_DRIFT_FAC_Q16 );
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psPLC->pitchL_Q8 = silk_min_32( psPLC->pitchL_Q8, silk_LSHIFT( silk_SMULBB( MAX_PITCH_LAG_MS, psDec->fs_kHz ), 8 ) );
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lag = silk_RSHIFT_ROUND( psPLC->pitchL_Q8, 8 );
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}
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/***************************/
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/* LPC synthesis filtering */
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/***************************/
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sLPC_Q14_ptr = &sLTP_Q14[ psDec->ltp_mem_length - MAX_LPC_ORDER ];
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/* Copy LPC state */
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silk_memcpy( sLPC_Q14_ptr, psDec->sLPC_Q14_buf, MAX_LPC_ORDER * sizeof( opus_int32 ) );
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celt_assert( psDec->LPC_order >= 10 ); /* check that unrolling works */
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for( i = 0; i < psDec->frame_length; i++ ) {
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/* partly unrolled */
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/* Avoids introducing a bias because silk_SMLAWB() always rounds to -inf */
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LPC_pred_Q10 = silk_RSHIFT( psDec->LPC_order, 1 );
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LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14_ptr[ MAX_LPC_ORDER + i - 1 ], A_Q12[ 0 ] );
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LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14_ptr[ MAX_LPC_ORDER + i - 2 ], A_Q12[ 1 ] );
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LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14_ptr[ MAX_LPC_ORDER + i - 3 ], A_Q12[ 2 ] );
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LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14_ptr[ MAX_LPC_ORDER + i - 4 ], A_Q12[ 3 ] );
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LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14_ptr[ MAX_LPC_ORDER + i - 5 ], A_Q12[ 4 ] );
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LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14_ptr[ MAX_LPC_ORDER + i - 6 ], A_Q12[ 5 ] );
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LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14_ptr[ MAX_LPC_ORDER + i - 7 ], A_Q12[ 6 ] );
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LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14_ptr[ MAX_LPC_ORDER + i - 8 ], A_Q12[ 7 ] );
|
|
LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14_ptr[ MAX_LPC_ORDER + i - 9 ], A_Q12[ 8 ] );
|
|
LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14_ptr[ MAX_LPC_ORDER + i - 10 ], A_Q12[ 9 ] );
|
|
for( j = 10; j < psDec->LPC_order; j++ ) {
|
|
LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14_ptr[ MAX_LPC_ORDER + i - j - 1 ], A_Q12[ j ] );
|
|
}
|
|
|
|
/* Add prediction to LPC excitation */
|
|
sLPC_Q14_ptr[ MAX_LPC_ORDER + i ] = silk_ADD_SAT32( sLPC_Q14_ptr[ MAX_LPC_ORDER + i ],
|
|
silk_LSHIFT_SAT32( LPC_pred_Q10, 4 ));
|
|
|
|
/* Scale with Gain */
|
|
frame[ i ] = (opus_int16)silk_SAT16( silk_SAT16( silk_RSHIFT_ROUND( silk_SMULWW( sLPC_Q14_ptr[ MAX_LPC_ORDER + i ], prevGain_Q10[ 1 ] ), 8 ) ) );
|
|
}
|
|
|
|
/* Save LPC state */
|
|
silk_memcpy( psDec->sLPC_Q14_buf, &sLPC_Q14_ptr[ psDec->frame_length ], MAX_LPC_ORDER * sizeof( opus_int32 ) );
|
|
|
|
/**************************************/
|
|
/* 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;
|
|
}
|
|
RESTORE_STACK;
|
|
}
|
|
|
|
/* Glues concealed frames with new good received frames */
|
|
void silk_PLC_glue_frames(
|
|
silk_decoder_state *psDec, /* I/O decoder state */
|
|
opus_int16 frame[], /* I/O signal */
|
|
opus_int length /* I length of signal */
|
|
)
|
|
{
|
|
opus_int i, energy_shift;
|
|
opus_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, frame, 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, frame, length );
|
|
|
|
/* Normalize energies */
|
|
if( energy_shift > psPLC->conc_energy_shift ) {
|
|
psPLC->conc_energy = silk_RSHIFT( psPLC->conc_energy, energy_shift - psPLC->conc_energy_shift );
|
|
} else if( energy_shift < psPLC->conc_energy_shift ) {
|
|
energy = silk_RSHIFT( energy, psPLC->conc_energy_shift - energy_shift );
|
|
}
|
|
|
|
/* Fade in the energy difference */
|
|
if( energy > psPLC->conc_energy ) {
|
|
opus_int32 frac_Q24, LZ;
|
|
opus_int32 gain_Q16, slope_Q16;
|
|
|
|
LZ = silk_CLZ32( psPLC->conc_energy );
|
|
LZ = LZ - 1;
|
|
psPLC->conc_energy = silk_LSHIFT( psPLC->conc_energy, LZ );
|
|
energy = silk_RSHIFT( energy, silk_max_32( 24 - LZ, 0 ) );
|
|
|
|
frac_Q24 = silk_DIV32( psPLC->conc_energy, silk_max( energy, 1 ) );
|
|
|
|
gain_Q16 = silk_LSHIFT( silk_SQRT_APPROX( frac_Q24 ), 4 );
|
|
slope_Q16 = silk_DIV32_16( ( (opus_int32)1 << 16 ) - gain_Q16, length );
|
|
/* Make slope 4x steeper to avoid missing onsets after DTX */
|
|
slope_Q16 = silk_LSHIFT( slope_Q16, 2 );
|
|
|
|
for( i = 0; i < length; i++ ) {
|
|
frame[ i ] = silk_SMULWB( gain_Q16, frame[ i ] );
|
|
gain_Q16 += slope_Q16;
|
|
if( gain_Q16 > (opus_int32)1 << 16 ) {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
psPLC->last_frame_lost = 0;
|
|
}
|
|
}
|