168 lines
8.3 KiB
C
168 lines
8.3 KiB
C
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/***********************************************************************
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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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/* Generates excitation for CNG LPC synthesis */
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static __inline void silk_CNG_exc(
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opus_int32 residual_Q10[], /* O CNG residual signal Q10 */
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opus_int32 exc_buf_Q14[], /* I Random samples buffer Q10 */
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opus_int32 Gain_Q16, /* I Gain to apply */
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opus_int length, /* I Length */
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opus_int32 *rand_seed /* I/O Seed to random index generator */
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)
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{
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opus_int32 seed;
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opus_int i, idx, exc_mask;
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exc_mask = CNG_BUF_MASK_MAX;
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while( exc_mask > length ) {
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exc_mask = silk_RSHIFT( exc_mask, 1 );
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}
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seed = *rand_seed;
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for( i = 0; i < length; i++ ) {
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seed = silk_RAND( seed );
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idx = (opus_int)( silk_RSHIFT( seed, 24 ) & exc_mask );
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silk_assert( idx >= 0 );
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silk_assert( idx <= CNG_BUF_MASK_MAX );
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residual_Q10[ i ] = (opus_int16)silk_SAT16( silk_SMULWW( exc_buf_Q14[ idx ], Gain_Q16 >> 4 ) );
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}
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*rand_seed = seed;
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}
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void silk_CNG_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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opus_int i, NLSF_step_Q15, NLSF_acc_Q15;
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NLSF_step_Q15 = silk_DIV32_16( silk_int16_MAX, psDec->LPC_order + 1 );
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NLSF_acc_Q15 = 0;
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for( i = 0; i < psDec->LPC_order; i++ ) {
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NLSF_acc_Q15 += NLSF_step_Q15;
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psDec->sCNG.CNG_smth_NLSF_Q15[ i ] = NLSF_acc_Q15;
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}
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psDec->sCNG.CNG_smth_Gain_Q16 = 0;
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psDec->sCNG.rand_seed = 3176576;
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}
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/* Updates CNG estimate, and applies the CNG when packet was lost */
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void silk_CNG(
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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 length /* I Length of residual */
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)
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{
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opus_int i, subfr;
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opus_int32 sum_Q6, max_Gain_Q16;
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opus_int16 A_Q12[ MAX_LPC_ORDER ];
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opus_int32 CNG_sig_Q10[ MAX_FRAME_LENGTH + MAX_LPC_ORDER ];
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silk_CNG_struct *psCNG = &psDec->sCNG;
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if( psDec->fs_kHz != psCNG->fs_kHz ) {
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/* Reset state */
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silk_CNG_Reset( psDec );
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psCNG->fs_kHz = psDec->fs_kHz;
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}
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if( psDec->lossCnt == 0 && psDec->prevSignalType == TYPE_NO_VOICE_ACTIVITY ) {
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/* Update CNG parameters */
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/* Smoothing of LSF's */
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for( i = 0; i < psDec->LPC_order; i++ ) {
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psCNG->CNG_smth_NLSF_Q15[ i ] += silk_SMULWB( (opus_int32)psDec->prevNLSF_Q15[ i ] - (opus_int32)psCNG->CNG_smth_NLSF_Q15[ i ], CNG_NLSF_SMTH_Q16 );
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}
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/* Find the subframe with the highest gain */
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max_Gain_Q16 = 0;
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subfr = 0;
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for( i = 0; i < psDec->nb_subfr; i++ ) {
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if( psDecCtrl->Gains_Q16[ i ] > max_Gain_Q16 ) {
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max_Gain_Q16 = psDecCtrl->Gains_Q16[ i ];
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subfr = i;
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}
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}
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/* Update CNG excitation buffer with excitation from this subframe */
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silk_memmove( &psCNG->CNG_exc_buf_Q14[ psDec->subfr_length ], psCNG->CNG_exc_buf_Q14, ( psDec->nb_subfr - 1 ) * psDec->subfr_length * sizeof( opus_int32 ) );
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silk_memcpy( psCNG->CNG_exc_buf_Q14, &psDec->exc_Q14[ subfr * psDec->subfr_length ], psDec->subfr_length * sizeof( opus_int32 ) );
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/* Smooth gains */
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for( i = 0; i < psDec->nb_subfr; i++ ) {
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psCNG->CNG_smth_Gain_Q16 += silk_SMULWB( psDecCtrl->Gains_Q16[ i ] - psCNG->CNG_smth_Gain_Q16, CNG_GAIN_SMTH_Q16 );
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}
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}
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/* Add CNG when packet is lost or during DTX */
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if( psDec->lossCnt ) {
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/* Generate CNG excitation */
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silk_CNG_exc( CNG_sig_Q10 + MAX_LPC_ORDER, psCNG->CNG_exc_buf_Q14, psCNG->CNG_smth_Gain_Q16, length, &psCNG->rand_seed );
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/* Convert CNG NLSF to filter representation */
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silk_NLSF2A( A_Q12, psCNG->CNG_smth_NLSF_Q15, psDec->LPC_order );
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/* Generate CNG signal, by synthesis filtering */
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silk_memcpy( CNG_sig_Q10, psCNG->CNG_synth_state, MAX_LPC_ORDER * sizeof( opus_int32 ) );
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for( i = 0; i < length; i++ ) {
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silk_assert( psDec->LPC_order == 10 || psDec->LPC_order == 16 );
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/* Avoids introducing a bias because silk_SMLAWB() always rounds to -inf */
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sum_Q6 = silk_RSHIFT( psDec->LPC_order, 1 );
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sum_Q6 = silk_SMLAWB( sum_Q6, CNG_sig_Q10[ MAX_LPC_ORDER + i - 1 ], A_Q12[ 0 ] );
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sum_Q6 = silk_SMLAWB( sum_Q6, CNG_sig_Q10[ MAX_LPC_ORDER + i - 2 ], A_Q12[ 1 ] );
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sum_Q6 = silk_SMLAWB( sum_Q6, CNG_sig_Q10[ MAX_LPC_ORDER + i - 3 ], A_Q12[ 2 ] );
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sum_Q6 = silk_SMLAWB( sum_Q6, CNG_sig_Q10[ MAX_LPC_ORDER + i - 4 ], A_Q12[ 3 ] );
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sum_Q6 = silk_SMLAWB( sum_Q6, CNG_sig_Q10[ MAX_LPC_ORDER + i - 5 ], A_Q12[ 4 ] );
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sum_Q6 = silk_SMLAWB( sum_Q6, CNG_sig_Q10[ MAX_LPC_ORDER + i - 6 ], A_Q12[ 5 ] );
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sum_Q6 = silk_SMLAWB( sum_Q6, CNG_sig_Q10[ MAX_LPC_ORDER + i - 7 ], A_Q12[ 6 ] );
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sum_Q6 = silk_SMLAWB( sum_Q6, CNG_sig_Q10[ MAX_LPC_ORDER + i - 8 ], A_Q12[ 7 ] );
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sum_Q6 = silk_SMLAWB( sum_Q6, CNG_sig_Q10[ MAX_LPC_ORDER + i - 9 ], A_Q12[ 8 ] );
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sum_Q6 = silk_SMLAWB( sum_Q6, CNG_sig_Q10[ MAX_LPC_ORDER + i - 10 ], A_Q12[ 9 ] );
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if( psDec->LPC_order == 16 ) {
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sum_Q6 = silk_SMLAWB( sum_Q6, CNG_sig_Q10[ MAX_LPC_ORDER + i - 11 ], A_Q12[ 10 ] );
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sum_Q6 = silk_SMLAWB( sum_Q6, CNG_sig_Q10[ MAX_LPC_ORDER + i - 12 ], A_Q12[ 11 ] );
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sum_Q6 = silk_SMLAWB( sum_Q6, CNG_sig_Q10[ MAX_LPC_ORDER + i - 13 ], A_Q12[ 12 ] );
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sum_Q6 = silk_SMLAWB( sum_Q6, CNG_sig_Q10[ MAX_LPC_ORDER + i - 14 ], A_Q12[ 13 ] );
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sum_Q6 = silk_SMLAWB( sum_Q6, CNG_sig_Q10[ MAX_LPC_ORDER + i - 15 ], A_Q12[ 14 ] );
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sum_Q6 = silk_SMLAWB( sum_Q6, CNG_sig_Q10[ MAX_LPC_ORDER + i - 16 ], A_Q12[ 15 ] );
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}
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/* Update states */
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CNG_sig_Q10[ MAX_LPC_ORDER + i ] = silk_ADD_LSHIFT( CNG_sig_Q10[ MAX_LPC_ORDER + i ], sum_Q6, 4 );
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frame[ i ] = silk_ADD_SAT16( frame[ i ], silk_RSHIFT_ROUND( sum_Q6, 6 ) );
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}
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silk_memcpy( psCNG->CNG_synth_state, &CNG_sig_Q10[ length ], MAX_LPC_ORDER * sizeof( opus_int32 ) );
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} else {
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silk_memset( psCNG->CNG_synth_state, 0, psDec->LPC_order * sizeof( opus_int32 ) );
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}
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}
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