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freeswitch/libs/silk/src/SKP_Silk_NSQ_del_dec.c

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/***********************************************************************
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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)
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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.
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- Redistributions in binary form must reproduce the above copyright
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 Skype Limited, nor the names of specific
contributors, may be used to endorse or promote products derived from
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this software without specific prior written permission.
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NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE GRANTED
BY THIS LICENSE. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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CONTRIBUTORS ''AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
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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,
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INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
***********************************************************************/
#include "SKP_Silk_main.h"
typedef struct {
SKP_int32 RandState[ DECISION_DELAY ];
SKP_int32 Q_Q10[ DECISION_DELAY ];
SKP_int32 Xq_Q10[ DECISION_DELAY ];
SKP_int32 Pred_Q16[ DECISION_DELAY ];
SKP_int32 Shape_Q10[ DECISION_DELAY ];
SKP_int32 Gain_Q16[ DECISION_DELAY ];
SKP_int32 sAR2_Q14[ MAX_SHAPE_LPC_ORDER ];
SKP_int32 sLPC_Q14[ MAX_FRAME_LENGTH / NB_SUBFR + NSQ_LPC_BUF_LENGTH ];
SKP_int32 LF_AR_Q12;
SKP_int32 Seed;
SKP_int32 SeedInit;
SKP_int32 RD_Q10;
} NSQ_del_dec_struct;
typedef struct {
SKP_int32 Q_Q10;
SKP_int32 RD_Q10;
SKP_int32 xq_Q14;
SKP_int32 LF_AR_Q12;
SKP_int32 sLTP_shp_Q10;
SKP_int32 LPC_exc_Q16;
} NSQ_sample_struct;
SKP_INLINE void SKP_Silk_copy_del_dec_state(
NSQ_del_dec_struct *DD_dst, /* I Dst del dec state */
NSQ_del_dec_struct *DD_src, /* I Src del dec state */
SKP_int LPC_state_idx /* I Index to LPC buffer */
);
SKP_INLINE void SKP_Silk_nsq_del_dec_scale_states(
SKP_Silk_nsq_state *NSQ, /* I/O NSQ state */
NSQ_del_dec_struct psDelDec[], /* I/O Delayed decision states */
const SKP_int16 x[], /* I Input in Q0 */
SKP_int32 x_sc_Q10[], /* O Input scaled with 1/Gain in Q10 */
SKP_int subfr_length, /* I Length of input */
const SKP_int16 sLTP[], /* I Re-whitened LTP state in Q0 */
SKP_int32 sLTP_Q16[], /* O LTP state matching scaled input */
SKP_int subfr, /* I Subframe number */
SKP_int nStatesDelayedDecision, /* I Number of del dec states */
SKP_int smpl_buf_idx, /* I Index to newest samples in buffers */
const SKP_int LTP_scale_Q14, /* I LTP state scaling */
const SKP_int32 Gains_Q16[ NB_SUBFR ], /* I */
const SKP_int pitchL[ NB_SUBFR ] /* I Pitch lag */
);
/******************************************/
/* Noise shape quantizer for one subframe */
/******************************************/
SKP_INLINE void SKP_Silk_noise_shape_quantizer_del_dec(
SKP_Silk_nsq_state *NSQ, /* I/O NSQ state */
NSQ_del_dec_struct psDelDec[], /* I/O Delayed decision states */
SKP_int sigtype, /* I Signal type */
const SKP_int32 x_Q10[], /* I */
SKP_int8 q[], /* O */
SKP_int16 xq[], /* O */
SKP_int32 sLTP_Q16[], /* I/O LTP filter state */
const SKP_int16 a_Q12[], /* I Short term prediction coefs */
const SKP_int16 b_Q14[], /* I Long term prediction coefs */
const SKP_int16 AR_shp_Q13[], /* I Noise shaping coefs */
SKP_int lag, /* I Pitch lag */
SKP_int32 HarmShapeFIRPacked_Q14, /* I */
SKP_int Tilt_Q14, /* I Spectral tilt */
SKP_int32 LF_shp_Q14, /* I */
SKP_int32 Gain_Q16, /* I */
SKP_int Lambda_Q10, /* I */
SKP_int offset_Q10, /* I */
SKP_int length, /* I Input length */
SKP_int subfr, /* I Subframe number */
SKP_int shapingLPCOrder, /* I Shaping LPC filter order */
SKP_int predictLPCOrder, /* I Prediction filter order */
SKP_int warping_Q16, /* I */
SKP_int nStatesDelayedDecision, /* I Number of states in decision tree */
SKP_int *smpl_buf_idx, /* I Index to newest samples in buffers */
SKP_int decisionDelay /* I */
);
void SKP_Silk_NSQ_del_dec(
SKP_Silk_encoder_state *psEncC, /* I/O Encoder State */
SKP_Silk_encoder_control *psEncCtrlC, /* I Encoder Control */
SKP_Silk_nsq_state *NSQ, /* I/O NSQ state */
const SKP_int16 x[], /* I Prefiltered input signal */
SKP_int8 q[], /* O Quantized pulse signal */
const SKP_int LSFInterpFactor_Q2, /* I LSF interpolation factor in Q2 */
const SKP_int16 PredCoef_Q12[ 2 * MAX_LPC_ORDER ], /* I Prediction coefs */
const SKP_int16 LTPCoef_Q14[ LTP_ORDER * NB_SUBFR ], /* I LT prediction coefs */
const SKP_int16 AR2_Q13[ NB_SUBFR * MAX_SHAPE_LPC_ORDER ], /* I */
const SKP_int HarmShapeGain_Q14[ NB_SUBFR ], /* I */
const SKP_int Tilt_Q14[ NB_SUBFR ], /* I Spectral tilt */
const SKP_int32 LF_shp_Q14[ NB_SUBFR ], /* I */
const SKP_int32 Gains_Q16[ NB_SUBFR ], /* I */
const SKP_int Lambda_Q10, /* I */
const SKP_int LTP_scale_Q14 /* I LTP state scaling */
)
{
SKP_int i, k, lag, start_idx, LSF_interpolation_flag, Winner_ind, subfr;
SKP_int last_smple_idx, smpl_buf_idx, decisionDelay, subfr_length;
const SKP_int16 *A_Q12, *B_Q14, *AR_shp_Q13;
SKP_int16 *pxq;
SKP_int32 sLTP_Q16[ 2 * MAX_FRAME_LENGTH ];
SKP_int16 sLTP[ 2 * MAX_FRAME_LENGTH ];
SKP_int32 HarmShapeFIRPacked_Q14;
SKP_int offset_Q10;
SKP_int32 FiltState[ MAX_LPC_ORDER ], RDmin_Q10;
SKP_int32 x_sc_Q10[ MAX_FRAME_LENGTH / NB_SUBFR ];
NSQ_del_dec_struct psDelDec[ MAX_DEL_DEC_STATES ];
NSQ_del_dec_struct *psDD;
subfr_length = psEncC->frame_length / NB_SUBFR;
/* Set unvoiced lag to the previous one, overwrite later for voiced */
lag = NSQ->lagPrev;
SKP_assert( NSQ->prev_inv_gain_Q16 != 0 );
/* Initialize delayed decision states */
SKP_memset( psDelDec, 0, psEncC->nStatesDelayedDecision * sizeof( NSQ_del_dec_struct ) );
for( k = 0; k < psEncC->nStatesDelayedDecision; k++ ) {
psDD = &psDelDec[ k ];
psDD->Seed = ( k + psEncCtrlC->Seed ) & 3;
psDD->SeedInit = psDD->Seed;
psDD->RD_Q10 = 0;
psDD->LF_AR_Q12 = NSQ->sLF_AR_shp_Q12;
psDD->Shape_Q10[ 0 ] = NSQ->sLTP_shp_Q10[ psEncC->frame_length - 1 ];
SKP_memcpy( psDD->sLPC_Q14, NSQ->sLPC_Q14, NSQ_LPC_BUF_LENGTH * sizeof( SKP_int32 ) );
SKP_memcpy( psDD->sAR2_Q14, NSQ->sAR2_Q14, sizeof( NSQ->sAR2_Q14 ) );
}
offset_Q10 = SKP_Silk_Quantization_Offsets_Q10[ psEncCtrlC->sigtype ][ psEncCtrlC->QuantOffsetType ];
smpl_buf_idx = 0; /* index of oldest samples */
decisionDelay = SKP_min_int( DECISION_DELAY, subfr_length );
/* For voiced frames limit the decision delay to lower than the pitch lag */
if( psEncCtrlC->sigtype == SIG_TYPE_VOICED ) {
for( k = 0; k < NB_SUBFR; k++ ) {
decisionDelay = SKP_min_int( decisionDelay, psEncCtrlC->pitchL[ k ] - LTP_ORDER / 2 - 1 );
}
} else {
if( lag > 0 ) {
decisionDelay = SKP_min_int( decisionDelay, lag - LTP_ORDER / 2 - 1 );
}
}
if( LSFInterpFactor_Q2 == ( 1 << 2 ) ) {
LSF_interpolation_flag = 0;
} else {
LSF_interpolation_flag = 1;
}
/* Setup pointers to start of sub frame */
pxq = &NSQ->xq[ psEncC->frame_length ];
NSQ->sLTP_shp_buf_idx = psEncC->frame_length;
NSQ->sLTP_buf_idx = psEncC->frame_length;
subfr = 0;
for( k = 0; k < NB_SUBFR; k++ ) {
A_Q12 = &PredCoef_Q12[ ( ( k >> 1 ) | ( 1 - LSF_interpolation_flag ) ) * MAX_LPC_ORDER ];
B_Q14 = &LTPCoef_Q14[ k * LTP_ORDER ];
AR_shp_Q13 = &AR2_Q13[ k * MAX_SHAPE_LPC_ORDER ];
/* Noise shape parameters */
SKP_assert( HarmShapeGain_Q14[ k ] >= 0 );
HarmShapeFIRPacked_Q14 = SKP_RSHIFT( HarmShapeGain_Q14[ k ], 2 );
HarmShapeFIRPacked_Q14 |= SKP_LSHIFT( ( SKP_int32 )SKP_RSHIFT( HarmShapeGain_Q14[ k ], 1 ), 16 );
NSQ->rewhite_flag = 0;
if( psEncCtrlC->sigtype == SIG_TYPE_VOICED ) {
/* Voiced */
lag = psEncCtrlC->pitchL[ k ];
/* Re-whitening */
if( ( k & ( 3 - SKP_LSHIFT( LSF_interpolation_flag, 1 ) ) ) == 0 ) {
if( k == 2 ) {
/* RESET DELAYED DECISIONS */
/* Find winner */
RDmin_Q10 = psDelDec[ 0 ].RD_Q10;
Winner_ind = 0;
for( i = 1; i < psEncC->nStatesDelayedDecision; i++ ) {
if( psDelDec[ i ].RD_Q10 < RDmin_Q10 ) {
RDmin_Q10 = psDelDec[ i ].RD_Q10;
Winner_ind = i;
}
}
for( i = 0; i < psEncC->nStatesDelayedDecision; i++ ) {
if( i != Winner_ind ) {
psDelDec[ i ].RD_Q10 += ( SKP_int32_MAX >> 4 );
SKP_assert( psDelDec[ i ].RD_Q10 >= 0 );
}
}
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/* Copy final part of signals from winner state to output and long-term filter states */
psDD = &psDelDec[ Winner_ind ];
last_smple_idx = smpl_buf_idx + decisionDelay;
for( i = 0; i < decisionDelay; i++ ) {
last_smple_idx = ( last_smple_idx - 1 ) & DECISION_DELAY_MASK;
q[ i - decisionDelay ] = ( SKP_int8 )SKP_RSHIFT( psDD->Q_Q10[ last_smple_idx ], 10 );
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pxq[ i - decisionDelay ] = ( SKP_int16 )SKP_SAT16( SKP_RSHIFT_ROUND(
SKP_SMULWW( psDD->Xq_Q10[ last_smple_idx ],
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psDD->Gain_Q16[ last_smple_idx ] ), 10 ) );
NSQ->sLTP_shp_Q10[ NSQ->sLTP_shp_buf_idx - decisionDelay + i ] = psDD->Shape_Q10[ last_smple_idx ];
}
subfr = 0;
}
/* Rewhiten with new A coefs */
start_idx = psEncC->frame_length - lag - psEncC->predictLPCOrder - LTP_ORDER / 2;
SKP_assert( start_idx >= 0 );
SKP_assert( start_idx <= psEncC->frame_length - psEncC->predictLPCOrder );
SKP_memset( FiltState, 0, psEncC->predictLPCOrder * sizeof( SKP_int32 ) );
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SKP_Silk_MA_Prediction( &NSQ->xq[ start_idx + k * psEncC->subfr_length ],
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A_Q12, FiltState, sLTP + start_idx, psEncC->frame_length - start_idx, psEncC->predictLPCOrder );
NSQ->sLTP_buf_idx = psEncC->frame_length;
NSQ->rewhite_flag = 1;
}
}
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SKP_Silk_nsq_del_dec_scale_states( NSQ, psDelDec, x, x_sc_Q10,
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subfr_length, sLTP, sLTP_Q16, k, psEncC->nStatesDelayedDecision, smpl_buf_idx,
LTP_scale_Q14, Gains_Q16, psEncCtrlC->pitchL );
SKP_Silk_noise_shape_quantizer_del_dec( NSQ, psDelDec, psEncCtrlC->sigtype, x_sc_Q10, q, pxq, sLTP_Q16,
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A_Q12, B_Q14, AR_shp_Q13, lag, HarmShapeFIRPacked_Q14, Tilt_Q14[ k ], LF_shp_Q14[ k ], Gains_Q16[ k ],
Lambda_Q10, offset_Q10, psEncC->subfr_length, subfr++, psEncC->shapingLPCOrder, psEncC->predictLPCOrder,
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psEncC->warping_Q16, psEncC->nStatesDelayedDecision, &smpl_buf_idx, decisionDelay );
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x += psEncC->subfr_length;
q += psEncC->subfr_length;
pxq += psEncC->subfr_length;
}
/* Find winner */
RDmin_Q10 = psDelDec[ 0 ].RD_Q10;
Winner_ind = 0;
for( k = 1; k < psEncC->nStatesDelayedDecision; k++ ) {
if( psDelDec[ k ].RD_Q10 < RDmin_Q10 ) {
RDmin_Q10 = psDelDec[ k ].RD_Q10;
Winner_ind = k;
}
}
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/* Copy final part of signals from winner state to output and long-term filter states */
psDD = &psDelDec[ Winner_ind ];
psEncCtrlC->Seed = psDD->SeedInit;
last_smple_idx = smpl_buf_idx + decisionDelay;
for( i = 0; i < decisionDelay; i++ ) {
last_smple_idx = ( last_smple_idx - 1 ) & DECISION_DELAY_MASK;
q[ i - decisionDelay ] = ( SKP_int8 )SKP_RSHIFT( psDD->Q_Q10[ last_smple_idx ], 10 );
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pxq[ i - decisionDelay ] = ( SKP_int16 )SKP_SAT16( SKP_RSHIFT_ROUND(
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SKP_SMULWW( psDD->Xq_Q10[ last_smple_idx ], psDD->Gain_Q16[ last_smple_idx ] ), 10 ) );
NSQ->sLTP_shp_Q10[ NSQ->sLTP_shp_buf_idx - decisionDelay + i ] = psDD->Shape_Q10[ last_smple_idx ];
sLTP_Q16[ NSQ->sLTP_buf_idx - decisionDelay + i ] = psDD->Pred_Q16[ last_smple_idx ];
}
SKP_memcpy( NSQ->sLPC_Q14, &psDD->sLPC_Q14[ psEncC->subfr_length ], NSQ_LPC_BUF_LENGTH * sizeof( SKP_int32 ) );
SKP_memcpy( NSQ->sAR2_Q14, psDD->sAR2_Q14, sizeof( psDD->sAR2_Q14 ) );
/* Update states */
NSQ->sLF_AR_shp_Q12 = psDD->LF_AR_Q12;
NSQ->lagPrev = psEncCtrlC->pitchL[ NB_SUBFR - 1 ];
/* Save quantized speech and noise shaping signals */
SKP_memcpy( NSQ->xq, &NSQ->xq[ psEncC->frame_length ], psEncC->frame_length * sizeof( SKP_int16 ) );
SKP_memcpy( NSQ->sLTP_shp_Q10, &NSQ->sLTP_shp_Q10[ psEncC->frame_length ], psEncC->frame_length * sizeof( SKP_int32 ) );
#ifdef USE_UNQUANTIZED_LSFS
DEBUG_STORE_DATA( xq_unq_lsfs.pcm, NSQ->xq, psEncC->frame_length * sizeof( SKP_int16 ) );
#endif
}
/******************************************/
/* Noise shape quantizer for one subframe */
/******************************************/
SKP_INLINE void SKP_Silk_noise_shape_quantizer_del_dec(
SKP_Silk_nsq_state *NSQ, /* I/O NSQ state */
NSQ_del_dec_struct psDelDec[], /* I/O Delayed decision states */
SKP_int sigtype, /* I Signal type */
const SKP_int32 x_Q10[], /* I */
SKP_int8 q[], /* O */
SKP_int16 xq[], /* O */
SKP_int32 sLTP_Q16[], /* I/O LTP filter state */
const SKP_int16 a_Q12[], /* I Short term prediction coefs */
const SKP_int16 b_Q14[], /* I Long term prediction coefs */
const SKP_int16 AR_shp_Q13[], /* I Noise shaping coefs */
SKP_int lag, /* I Pitch lag */
SKP_int32 HarmShapeFIRPacked_Q14, /* I */
SKP_int Tilt_Q14, /* I Spectral tilt */
SKP_int32 LF_shp_Q14, /* I */
SKP_int32 Gain_Q16, /* I */
SKP_int Lambda_Q10, /* I */
SKP_int offset_Q10, /* I */
SKP_int length, /* I Input length */
SKP_int subfr, /* I Subframe number */
SKP_int shapingLPCOrder, /* I Shaping LPC filter order */
SKP_int predictLPCOrder, /* I Prediction filter order */
SKP_int warping_Q16, /* I */
SKP_int nStatesDelayedDecision, /* I Number of states in decision tree */
SKP_int *smpl_buf_idx, /* I Index to newest samples in buffers */
SKP_int decisionDelay /* I */
)
{
SKP_int i, j, k, Winner_ind, RDmin_ind, RDmax_ind, last_smple_idx;
SKP_int32 Winner_rand_state;
SKP_int32 LTP_pred_Q14, LPC_pred_Q10, n_AR_Q10, n_LTP_Q14;
SKP_int32 n_LF_Q10, r_Q10, rr_Q20, rd1_Q10, rd2_Q10, RDmin_Q10, RDmax_Q10;
SKP_int32 q1_Q10, q2_Q10, dither, exc_Q10, LPC_exc_Q10, xq_Q10;
SKP_int32 tmp1, tmp2, sLF_AR_shp_Q10;
SKP_int32 *pred_lag_ptr, *shp_lag_ptr, *psLPC_Q14;
NSQ_sample_struct psSampleState[ MAX_DEL_DEC_STATES ][ 2 ];
NSQ_del_dec_struct *psDD;
NSQ_sample_struct *psSS;
shp_lag_ptr = &NSQ->sLTP_shp_Q10[ NSQ->sLTP_shp_buf_idx - lag + HARM_SHAPE_FIR_TAPS / 2 ];
pred_lag_ptr = &sLTP_Q16[ NSQ->sLTP_buf_idx - lag + LTP_ORDER / 2 ];
for( i = 0; i < length; i++ ) {
/* Perform common calculations used in all states */
/* Long-term prediction */
if( sigtype == SIG_TYPE_VOICED ) {
/* 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++;
} else {
LTP_pred_Q14 = 0;
}
/* Long-term shaping */
if( lag > 0 ) {
/* Symmetric, packed FIR coefficients */
n_LTP_Q14 = SKP_SMULWB( SKP_ADD32( shp_lag_ptr[ 0 ], shp_lag_ptr[ -2 ] ), HarmShapeFIRPacked_Q14 );
n_LTP_Q14 = SKP_SMLAWT( n_LTP_Q14, shp_lag_ptr[ -1 ], HarmShapeFIRPacked_Q14 );
n_LTP_Q14 = SKP_LSHIFT( n_LTP_Q14, 6 );
shp_lag_ptr++;
} else {
n_LTP_Q14 = 0;
}
for( k = 0; k < nStatesDelayedDecision; k++ ) {
/* Delayed decision state */
psDD = &psDelDec[ k ];
/* Sample state */
psSS = psSampleState[ k ];
/* Generate dither */
psDD->Seed = SKP_RAND( psDD->Seed );
/* dither = rand_seed < 0 ? 0xFFFFFFFF : 0; */
dither = SKP_RSHIFT( psDD->Seed, 31 );
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/* Pointer used in short term prediction and shaping */
psLPC_Q14 = &psDD->sLPC_Q14[ NSQ_LPC_BUF_LENGTH - 1 + i ];
/* Short-term prediction */
SKP_assert( predictLPCOrder >= 10 ); /* check that unrolling works */
SKP_assert( ( predictLPCOrder & 1 ) == 0 ); /* check that order is even */
SKP_assert( ( ( ( int )( ( char* )( a_Q12 ) - ( ( char* ) 0 ) ) ) & 3 ) == 0 ); /* check that array starts at 4-byte aligned address */
/* Partially unrolled */
LPC_pred_Q10 = SKP_SMULWB( psLPC_Q14[ 0 ], a_Q12[ 0 ] );
LPC_pred_Q10 = SKP_SMLAWB( LPC_pred_Q10, psLPC_Q14[ -1 ], a_Q12[ 1 ] );
LPC_pred_Q10 = SKP_SMLAWB( LPC_pred_Q10, psLPC_Q14[ -2 ], a_Q12[ 2 ] );
LPC_pred_Q10 = SKP_SMLAWB( LPC_pred_Q10, psLPC_Q14[ -3 ], a_Q12[ 3 ] );
LPC_pred_Q10 = SKP_SMLAWB( LPC_pred_Q10, psLPC_Q14[ -4 ], a_Q12[ 4 ] );
LPC_pred_Q10 = SKP_SMLAWB( LPC_pred_Q10, psLPC_Q14[ -5 ], a_Q12[ 5 ] );
LPC_pred_Q10 = SKP_SMLAWB( LPC_pred_Q10, psLPC_Q14[ -6 ], a_Q12[ 6 ] );
LPC_pred_Q10 = SKP_SMLAWB( LPC_pred_Q10, psLPC_Q14[ -7 ], a_Q12[ 7 ] );
LPC_pred_Q10 = SKP_SMLAWB( LPC_pred_Q10, psLPC_Q14[ -8 ], a_Q12[ 8 ] );
LPC_pred_Q10 = SKP_SMLAWB( LPC_pred_Q10, psLPC_Q14[ -9 ], a_Q12[ 9 ] );
for( j = 10; j < predictLPCOrder; j ++ ) {
LPC_pred_Q10 = SKP_SMLAWB( LPC_pred_Q10, psLPC_Q14[ -j ], a_Q12[ j ] );
}
/* Noise shape feedback */
SKP_assert( ( shapingLPCOrder & 1 ) == 0 ); /* check that order is even */
/* Output of lowpass section */
tmp2 = SKP_SMLAWB( psLPC_Q14[ 0 ], psDD->sAR2_Q14[ 0 ], warping_Q16 );
/* Output of allpass section */
tmp1 = SKP_SMLAWB( psDD->sAR2_Q14[ 0 ], psDD->sAR2_Q14[ 1 ] - tmp2, warping_Q16 );
psDD->sAR2_Q14[ 0 ] = tmp2;
n_AR_Q10 = SKP_SMULWB( tmp2, AR_shp_Q13[ 0 ] );
/* Loop over allpass sections */
for( j = 2; j < shapingLPCOrder; j += 2 ) {
/* Output of allpass section */
tmp2 = SKP_SMLAWB( psDD->sAR2_Q14[ j - 1 ], psDD->sAR2_Q14[ j + 0 ] - tmp1, warping_Q16 );
psDD->sAR2_Q14[ j - 1 ] = tmp1;
n_AR_Q10 = SKP_SMLAWB( n_AR_Q10, tmp1, AR_shp_Q13[ j - 1 ] );
/* Output of allpass section */
tmp1 = SKP_SMLAWB( psDD->sAR2_Q14[ j + 0 ], psDD->sAR2_Q14[ j + 1 ] - tmp2, warping_Q16 );
psDD->sAR2_Q14[ j + 0 ] = tmp2;
n_AR_Q10 = SKP_SMLAWB( n_AR_Q10, tmp2, AR_shp_Q13[ j ] );
}
psDD->sAR2_Q14[ shapingLPCOrder - 1 ] = tmp1;
n_AR_Q10 = SKP_SMLAWB( n_AR_Q10, tmp1, AR_shp_Q13[ shapingLPCOrder - 1 ] );
n_AR_Q10 = SKP_RSHIFT( n_AR_Q10, 1 ); /* Q11 -> Q10 */
n_AR_Q10 = SKP_SMLAWB( n_AR_Q10, psDD->LF_AR_Q12, Tilt_Q14 );
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n_LF_Q10 = SKP_LSHIFT( SKP_SMULWB( psDD->Shape_Q10[ *smpl_buf_idx ], LF_shp_Q14 ), 2 );
n_LF_Q10 = SKP_SMLAWT( n_LF_Q10, psDD->LF_AR_Q12, LF_shp_Q14 );
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/* Input minus prediction plus noise feedback */
/* r = x[ i ] - LTP_pred - LPC_pred + n_AR + n_Tilt + n_LF + n_LTP */
tmp1 = SKP_SUB32( LTP_pred_Q14, n_LTP_Q14 ); /* Add Q14 stuff */
tmp1 = SKP_RSHIFT( tmp1, 4 ); /* convert to Q10 */
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tmp1 = SKP_ADD32( tmp1, LPC_pred_Q10 ); /* add Q10 stuff */
tmp1 = SKP_SUB32( tmp1, n_AR_Q10 ); /* subtract Q10 stuff */
tmp1 = SKP_SUB32( tmp1, n_LF_Q10 ); /* subtract Q10 stuff */
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r_Q10 = SKP_SUB32( x_Q10[ i ], tmp1 ); /* residual error Q10 */
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/* Flip sign depending on dither */
r_Q10 = ( r_Q10 ^ dither ) - dither;
r_Q10 = SKP_SUB32( r_Q10, offset_Q10 );
r_Q10 = SKP_LIMIT_32( r_Q10, -64 << 10, 64 << 10 );
/* Find two quantization level candidates and measure their rate-distortion */
if( r_Q10 < -1536 ) {
q1_Q10 = SKP_LSHIFT( SKP_RSHIFT_ROUND( r_Q10, 10 ), 10 );
r_Q10 = SKP_SUB32( r_Q10, q1_Q10 );
rd1_Q10 = SKP_RSHIFT( SKP_SMLABB( SKP_MUL( -SKP_ADD32( q1_Q10, offset_Q10 ), Lambda_Q10 ), r_Q10, r_Q10 ), 10 );
rd2_Q10 = SKP_ADD32( rd1_Q10, 1024 );
rd2_Q10 = SKP_SUB32( rd2_Q10, SKP_ADD_LSHIFT32( Lambda_Q10, r_Q10, 1 ) );
q2_Q10 = SKP_ADD32( q1_Q10, 1024 );
} else if( r_Q10 > 512 ) {
q1_Q10 = SKP_LSHIFT( SKP_RSHIFT_ROUND( r_Q10, 10 ), 10 );
r_Q10 = SKP_SUB32( r_Q10, q1_Q10 );
rd1_Q10 = SKP_RSHIFT( SKP_SMLABB( SKP_MUL( SKP_ADD32( q1_Q10, offset_Q10 ), Lambda_Q10 ), r_Q10, r_Q10 ), 10 );
rd2_Q10 = SKP_ADD32( rd1_Q10, 1024 );
rd2_Q10 = SKP_SUB32( rd2_Q10, SKP_SUB_LSHIFT32( Lambda_Q10, r_Q10, 1 ) );
q2_Q10 = SKP_SUB32( q1_Q10, 1024 );
} else { /* r_Q10 >= -1536 && q1_Q10 <= 512 */
rr_Q20 = SKP_SMULBB( offset_Q10, Lambda_Q10 );
rd2_Q10 = SKP_RSHIFT( SKP_SMLABB( rr_Q20, r_Q10, r_Q10 ), 10 );
rd1_Q10 = SKP_ADD32( rd2_Q10, 1024 );
rd1_Q10 = SKP_ADD32( rd1_Q10, SKP_SUB_RSHIFT32( SKP_ADD_LSHIFT32( Lambda_Q10, r_Q10, 1 ), rr_Q20, 9 ) );
q1_Q10 = -1024;
q2_Q10 = 0;
}
if( rd1_Q10 < rd2_Q10 ) {
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psSS[ 0 ].RD_Q10 = SKP_ADD32( psDD->RD_Q10, rd1_Q10 );
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psSS[ 1 ].RD_Q10 = SKP_ADD32( psDD->RD_Q10, rd2_Q10 );
psSS[ 0 ].Q_Q10 = q1_Q10;
psSS[ 1 ].Q_Q10 = q2_Q10;
} else {
psSS[ 0 ].RD_Q10 = SKP_ADD32( psDD->RD_Q10, rd2_Q10 );
psSS[ 1 ].RD_Q10 = SKP_ADD32( psDD->RD_Q10, rd1_Q10 );
psSS[ 0 ].Q_Q10 = q2_Q10;
psSS[ 1 ].Q_Q10 = q1_Q10;
}
/* Update states for best quantization */
/* Quantized excitation */
exc_Q10 = SKP_ADD32( offset_Q10, psSS[ 0 ].Q_Q10 );
exc_Q10 = ( exc_Q10 ^ dither ) - dither;
/* Add predictions */
LPC_exc_Q10 = exc_Q10 + SKP_RSHIFT_ROUND( LTP_pred_Q14, 4 );
xq_Q10 = SKP_ADD32( LPC_exc_Q10, LPC_pred_Q10 );
/* Update states */
sLF_AR_shp_Q10 = SKP_SUB32( xq_Q10, n_AR_Q10 );
psSS[ 0 ].sLTP_shp_Q10 = SKP_SUB32( sLF_AR_shp_Q10, n_LF_Q10 );
psSS[ 0 ].LF_AR_Q12 = SKP_LSHIFT( sLF_AR_shp_Q10, 2 );
psSS[ 0 ].xq_Q14 = SKP_LSHIFT( xq_Q10, 4 );
psSS[ 0 ].LPC_exc_Q16 = SKP_LSHIFT( LPC_exc_Q10, 6 );
/* Update states for second best quantization */
/* Quantized excitation */
exc_Q10 = SKP_ADD32( offset_Q10, psSS[ 1 ].Q_Q10 );
exc_Q10 = ( exc_Q10 ^ dither ) - dither;
/* Add predictions */
LPC_exc_Q10 = exc_Q10 + SKP_RSHIFT_ROUND( LTP_pred_Q14, 4 );
xq_Q10 = SKP_ADD32( LPC_exc_Q10, LPC_pred_Q10 );
/* Update states */
sLF_AR_shp_Q10 = SKP_SUB32( xq_Q10, n_AR_Q10 );
psSS[ 1 ].sLTP_shp_Q10 = SKP_SUB32( sLF_AR_shp_Q10, n_LF_Q10 );
psSS[ 1 ].LF_AR_Q12 = SKP_LSHIFT( sLF_AR_shp_Q10, 2 );
psSS[ 1 ].xq_Q14 = SKP_LSHIFT( xq_Q10, 4 );
psSS[ 1 ].LPC_exc_Q16 = SKP_LSHIFT( LPC_exc_Q10, 6 );
}
*smpl_buf_idx = ( *smpl_buf_idx - 1 ) & DECISION_DELAY_MASK; /* Index to newest samples */
last_smple_idx = ( *smpl_buf_idx + decisionDelay ) & DECISION_DELAY_MASK; /* Index to decisionDelay old samples */
/* Find winner */
RDmin_Q10 = psSampleState[ 0 ][ 0 ].RD_Q10;
Winner_ind = 0;
for( k = 1; k < nStatesDelayedDecision; k++ ) {
if( psSampleState[ k ][ 0 ].RD_Q10 < RDmin_Q10 ) {
RDmin_Q10 = psSampleState[ k ][ 0 ].RD_Q10;
Winner_ind = k;
}
}
/* Increase RD values of expired states */
Winner_rand_state = psDelDec[ Winner_ind ].RandState[ last_smple_idx ];
for( k = 0; k < nStatesDelayedDecision; k++ ) {
if( psDelDec[ k ].RandState[ last_smple_idx ] != Winner_rand_state ) {
psSampleState[ k ][ 0 ].RD_Q10 = SKP_ADD32( psSampleState[ k ][ 0 ].RD_Q10, ( SKP_int32_MAX >> 4 ) );
psSampleState[ k ][ 1 ].RD_Q10 = SKP_ADD32( psSampleState[ k ][ 1 ].RD_Q10, ( SKP_int32_MAX >> 4 ) );
SKP_assert( psSampleState[ k ][ 0 ].RD_Q10 >= 0 );
}
}
/* Find worst in first set and best in second set */
RDmax_Q10 = psSampleState[ 0 ][ 0 ].RD_Q10;
RDmin_Q10 = psSampleState[ 0 ][ 1 ].RD_Q10;
RDmax_ind = 0;
RDmin_ind = 0;
for( k = 1; k < nStatesDelayedDecision; k++ ) {
/* find worst in first set */
if( psSampleState[ k ][ 0 ].RD_Q10 > RDmax_Q10 ) {
RDmax_Q10 = psSampleState[ k ][ 0 ].RD_Q10;
RDmax_ind = k;
}
/* find best in second set */
if( psSampleState[ k ][ 1 ].RD_Q10 < RDmin_Q10 ) {
RDmin_Q10 = psSampleState[ k ][ 1 ].RD_Q10;
RDmin_ind = k;
}
}
/* Replace a state if best from second set outperforms worst in first set */
if( RDmin_Q10 < RDmax_Q10 ) {
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SKP_Silk_copy_del_dec_state( &psDelDec[ RDmax_ind ], &psDelDec[ RDmin_ind ], i );
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SKP_memcpy( &psSampleState[ RDmax_ind ][ 0 ], &psSampleState[ RDmin_ind ][ 1 ], sizeof( NSQ_sample_struct ) );
}
/* Write samples from winner to output and long-term filter states */
psDD = &psDelDec[ Winner_ind ];
if( subfr > 0 || i >= decisionDelay ) {
q[ i - decisionDelay ] = ( SKP_int8 )SKP_RSHIFT( psDD->Q_Q10[ last_smple_idx ], 10 );
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xq[ i - decisionDelay ] = ( SKP_int16 )SKP_SAT16( SKP_RSHIFT_ROUND(
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SKP_SMULWW( psDD->Xq_Q10[ last_smple_idx ], psDD->Gain_Q16[ last_smple_idx ] ), 10 ) );
NSQ->sLTP_shp_Q10[ NSQ->sLTP_shp_buf_idx - decisionDelay ] = psDD->Shape_Q10[ last_smple_idx ];
sLTP_Q16[ NSQ->sLTP_buf_idx - decisionDelay ] = psDD->Pred_Q16[ last_smple_idx ];
}
NSQ->sLTP_shp_buf_idx++;
NSQ->sLTP_buf_idx++;
/* Update states */
for( k = 0; k < nStatesDelayedDecision; k++ ) {
psDD = &psDelDec[ k ];
psSS = &psSampleState[ k ][ 0 ];
psDD->LF_AR_Q12 = psSS->LF_AR_Q12;
psDD->sLPC_Q14[ NSQ_LPC_BUF_LENGTH + i ] = psSS->xq_Q14;
psDD->Xq_Q10[ *smpl_buf_idx ] = SKP_RSHIFT( psSS->xq_Q14, 4 );
psDD->Q_Q10[ *smpl_buf_idx ] = psSS->Q_Q10;
psDD->Pred_Q16[ *smpl_buf_idx ] = psSS->LPC_exc_Q16;
psDD->Shape_Q10[ *smpl_buf_idx ] = psSS->sLTP_shp_Q10;
psDD->Seed = SKP_ADD_RSHIFT32( psDD->Seed, psSS->Q_Q10, 10 );
psDD->RandState[ *smpl_buf_idx ] = psDD->Seed;
psDD->RD_Q10 = psSS->RD_Q10;
psDD->Gain_Q16[ *smpl_buf_idx ] = Gain_Q16;
}
}
/* Update LPC states */
for( k = 0; k < nStatesDelayedDecision; k++ ) {
psDD = &psDelDec[ k ];
SKP_memcpy( psDD->sLPC_Q14, &psDD->sLPC_Q14[ length ], NSQ_LPC_BUF_LENGTH * sizeof( SKP_int32 ) );
}
}
SKP_INLINE void SKP_Silk_nsq_del_dec_scale_states(
SKP_Silk_nsq_state *NSQ, /* I/O NSQ state */
NSQ_del_dec_struct psDelDec[], /* I/O Delayed decision states */
const SKP_int16 x[], /* I Input in Q0 */
SKP_int32 x_sc_Q10[], /* O Input scaled with 1/Gain in Q10 */
SKP_int subfr_length, /* I Length of input */
const SKP_int16 sLTP[], /* I Re-whitened LTP state in Q0 */
SKP_int32 sLTP_Q16[], /* O LTP state matching scaled input */
SKP_int subfr, /* I Subframe number */
SKP_int nStatesDelayedDecision, /* I Number of del dec states */
SKP_int smpl_buf_idx, /* I Index to newest samples in buffers */
const SKP_int LTP_scale_Q14, /* I LTP state scaling */
const SKP_int32 Gains_Q16[ NB_SUBFR ], /* I */
const SKP_int pitchL[ NB_SUBFR ] /* I Pitch lag */
)
{
SKP_int i, k, lag;
SKP_int32 inv_gain_Q16, gain_adj_Q16, inv_gain_Q32;
NSQ_del_dec_struct *psDD;
inv_gain_Q16 = SKP_INVERSE32_varQ( SKP_max( Gains_Q16[ subfr ], 1 ), 32 );
inv_gain_Q16 = SKP_min( inv_gain_Q16, SKP_int16_MAX );
lag = pitchL[ subfr ];
/* After rewhitening the LTP state is un-scaled, so scale with inv_gain_Q16 */
if( NSQ->rewhite_flag ) {
inv_gain_Q32 = SKP_LSHIFT( inv_gain_Q16, 16 );
if( subfr == 0 ) {
/* Do LTP downscaling */
inv_gain_Q32 = SKP_LSHIFT( SKP_SMULWB( inv_gain_Q32, LTP_scale_Q14 ), 2 );
}
for( i = NSQ->sLTP_buf_idx - lag - LTP_ORDER / 2; i < NSQ->sLTP_buf_idx; i++ ) {
SKP_assert( i < MAX_FRAME_LENGTH );
sLTP_Q16[ i ] = SKP_SMULWB( inv_gain_Q32, sLTP[ i ] );
}
}
/* Adjust for changing gain */
if( inv_gain_Q16 != NSQ->prev_inv_gain_Q16 ) {
gain_adj_Q16 = SKP_DIV32_varQ( inv_gain_Q16, NSQ->prev_inv_gain_Q16, 16 );
/* Scale long-term shaping state */
for( i = NSQ->sLTP_shp_buf_idx - subfr_length * NB_SUBFR; i < NSQ->sLTP_shp_buf_idx; i++ ) {
NSQ->sLTP_shp_Q10[ i ] = SKP_SMULWW( gain_adj_Q16, NSQ->sLTP_shp_Q10[ i ] );
}
/* Scale long-term prediction state */
if( NSQ->rewhite_flag == 0 ) {
for( i = NSQ->sLTP_buf_idx - lag - LTP_ORDER / 2; i < NSQ->sLTP_buf_idx; i++ ) {
sLTP_Q16[ i ] = SKP_SMULWW( gain_adj_Q16, sLTP_Q16[ i ] );
}
}
for( k = 0; k < nStatesDelayedDecision; k++ ) {
psDD = &psDelDec[ k ];
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/* Scale scalar states */
psDD->LF_AR_Q12 = SKP_SMULWW( gain_adj_Q16, psDD->LF_AR_Q12 );
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/* Scale short-term prediction and shaping states */
for( i = 0; i < NSQ_LPC_BUF_LENGTH; i++ ) {
psDD->sLPC_Q14[ i ] = SKP_SMULWW( gain_adj_Q16, psDD->sLPC_Q14[ i ] );
}
for( i = 0; i < MAX_SHAPE_LPC_ORDER; i++ ) {
psDD->sAR2_Q14[ i ] = SKP_SMULWW( gain_adj_Q16, psDD->sAR2_Q14[ i ] );
}
for( i = 0; i < DECISION_DELAY; i++ ) {
psDD->Pred_Q16[ i ] = SKP_SMULWW( gain_adj_Q16, psDD->Pred_Q16[ i ] );
psDD->Shape_Q10[ i ] = SKP_SMULWW( gain_adj_Q16, psDD->Shape_Q10[ i ] );
}
}
}
/* Scale input */
for( i = 0; i < subfr_length; i++ ) {
x_sc_Q10[ i ] = SKP_RSHIFT( SKP_SMULBB( x[ i ], ( SKP_int16 )inv_gain_Q16 ), 6 );
}
/* save inv_gain */
SKP_assert( inv_gain_Q16 != 0 );
NSQ->prev_inv_gain_Q16 = inv_gain_Q16;
}
SKP_INLINE void SKP_Silk_copy_del_dec_state(
NSQ_del_dec_struct *DD_dst, /* I Dst del dec state */
NSQ_del_dec_struct *DD_src, /* I Src del dec state */
SKP_int LPC_state_idx /* I Index to LPC buffer */
)
{
SKP_memcpy( DD_dst->RandState, DD_src->RandState, sizeof( DD_src->RandState ) );
SKP_memcpy( DD_dst->Q_Q10, DD_src->Q_Q10, sizeof( DD_src->Q_Q10 ) );
SKP_memcpy( DD_dst->Pred_Q16, DD_src->Pred_Q16, sizeof( DD_src->Pred_Q16 ) );
SKP_memcpy( DD_dst->Shape_Q10, DD_src->Shape_Q10, sizeof( DD_src->Shape_Q10 ) );
SKP_memcpy( DD_dst->Xq_Q10, DD_src->Xq_Q10, sizeof( DD_src->Xq_Q10 ) );
SKP_memcpy( DD_dst->sAR2_Q14, DD_src->sAR2_Q14, sizeof( DD_src->sAR2_Q14 ) );
SKP_memcpy( &DD_dst->sLPC_Q14[ LPC_state_idx ], &DD_src->sLPC_Q14[ LPC_state_idx ], NSQ_LPC_BUF_LENGTH * sizeof( SKP_int32 ) );
DD_dst->LF_AR_Q12 = DD_src->LF_AR_Q12;
DD_dst->Seed = DD_src->Seed;
DD_dst->SeedInit = DD_src->SeedInit;
DD_dst->RD_Q10 = DD_src->RD_Q10;
}