| /*********************************************************************** |
| Copyright (c) 2006-2011, Skype Limited. All rights reserved. |
| Redistribution and use in source and binary forms, with or without |
| modification, 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. |
| - Neither the name of Internet Society, IETF or IETF Trust, nor the |
| names of specific contributors, may be used to endorse or promote |
| products derived from this software without specific prior written |
| permission. |
| 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 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 OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| POSSIBILITY OF SUCH DAMAGE. |
| ***********************************************************************/ |
| |
| #ifdef HAVE_CONFIG_H |
| #include "config.h" |
| #endif |
| |
| #include "main.h" |
| #include "stack_alloc.h" |
| #include "NSQ.h" |
| |
| |
| static OPUS_INLINE void silk_nsq_scale_states( |
| const silk_encoder_state *psEncC, /* I Encoder State */ |
| silk_nsq_state *NSQ, /* I/O NSQ state */ |
| const opus_int16 x16[], /* I input */ |
| opus_int32 x_sc_Q10[], /* O input scaled with 1/Gain */ |
| const opus_int16 sLTP[], /* I re-whitened LTP state in Q0 */ |
| opus_int32 sLTP_Q15[], /* O LTP state matching scaled input */ |
| opus_int subfr, /* I subframe number */ |
| const opus_int LTP_scale_Q14, /* I */ |
| const opus_int32 Gains_Q16[ MAX_NB_SUBFR ], /* I */ |
| const opus_int pitchL[ MAX_NB_SUBFR ], /* I Pitch lag */ |
| const opus_int signal_type /* I Signal type */ |
| ); |
| |
| #if !defined(OPUS_X86_MAY_HAVE_SSE4_1) |
| static OPUS_INLINE void silk_noise_shape_quantizer( |
| silk_nsq_state *NSQ, /* I/O NSQ state */ |
| opus_int signalType, /* I Signal type */ |
| const opus_int32 x_sc_Q10[], /* I */ |
| opus_int8 pulses[], /* O */ |
| opus_int16 xq[], /* O */ |
| opus_int32 sLTP_Q15[], /* I/O LTP state */ |
| const opus_int16 a_Q12[], /* I Short term prediction coefs */ |
| const opus_int16 b_Q14[], /* I Long term prediction coefs */ |
| const opus_int16 AR_shp_Q13[], /* I Noise shaping AR coefs */ |
| opus_int lag, /* I Pitch lag */ |
| opus_int32 HarmShapeFIRPacked_Q14, /* I */ |
| opus_int Tilt_Q14, /* I Spectral tilt */ |
| opus_int32 LF_shp_Q14, /* I */ |
| opus_int32 Gain_Q16, /* I */ |
| opus_int Lambda_Q10, /* I */ |
| opus_int offset_Q10, /* I */ |
| opus_int length, /* I Input length */ |
| opus_int shapingLPCOrder, /* I Noise shaping AR filter order */ |
| opus_int predictLPCOrder, /* I Prediction filter order */ |
| int arch /* I Architecture */ |
| ); |
| #endif |
| |
| void silk_NSQ_c |
| ( |
| const silk_encoder_state *psEncC, /* I Encoder State */ |
| silk_nsq_state *NSQ, /* I/O NSQ state */ |
| SideInfoIndices *psIndices, /* I/O Quantization Indices */ |
| const opus_int16 x16[], /* I Input */ |
| opus_int8 pulses[], /* O Quantized pulse signal */ |
| const opus_int16 PredCoef_Q12[ 2 * MAX_LPC_ORDER ], /* I Short term prediction coefs */ |
| const opus_int16 LTPCoef_Q14[ LTP_ORDER * MAX_NB_SUBFR ], /* I Long term prediction coefs */ |
| const opus_int16 AR_Q13[ MAX_NB_SUBFR * MAX_SHAPE_LPC_ORDER ], /* I Noise shaping coefs */ |
| const opus_int HarmShapeGain_Q14[ MAX_NB_SUBFR ], /* I Long term shaping coefs */ |
| const opus_int Tilt_Q14[ MAX_NB_SUBFR ], /* I Spectral tilt */ |
| const opus_int32 LF_shp_Q14[ MAX_NB_SUBFR ], /* I Low frequency shaping coefs */ |
| const opus_int32 Gains_Q16[ MAX_NB_SUBFR ], /* I Quantization step sizes */ |
| const opus_int pitchL[ MAX_NB_SUBFR ], /* I Pitch lags */ |
| const opus_int Lambda_Q10, /* I Rate/distortion tradeoff */ |
| const opus_int LTP_scale_Q14 /* I LTP state scaling */ |
| ) |
| { |
| opus_int k, lag, start_idx, LSF_interpolation_flag; |
| const opus_int16 *A_Q12, *B_Q14, *AR_shp_Q13; |
| opus_int16 *pxq; |
| VARDECL( opus_int32, sLTP_Q15 ); |
| VARDECL( opus_int16, sLTP ); |
| opus_int32 HarmShapeFIRPacked_Q14; |
| opus_int offset_Q10; |
| VARDECL( opus_int32, x_sc_Q10 ); |
| SAVE_STACK; |
| |
| NSQ->rand_seed = psIndices->Seed; |
| |
| /* Set unvoiced lag to the previous one, overwrite later for voiced */ |
| lag = NSQ->lagPrev; |
| |
| silk_assert( NSQ->prev_gain_Q16 != 0 ); |
| |
| offset_Q10 = silk_Quantization_Offsets_Q10[ psIndices->signalType >> 1 ][ psIndices->quantOffsetType ]; |
| |
| if( psIndices->NLSFInterpCoef_Q2 == 4 ) { |
| LSF_interpolation_flag = 0; |
| } else { |
| LSF_interpolation_flag = 1; |
| } |
| |
| ALLOC( sLTP_Q15, psEncC->ltp_mem_length + psEncC->frame_length, opus_int32 ); |
| ALLOC( sLTP, psEncC->ltp_mem_length + psEncC->frame_length, opus_int16 ); |
| ALLOC( x_sc_Q10, psEncC->subfr_length, opus_int32 ); |
| /* Set up pointers to start of sub frame */ |
| NSQ->sLTP_shp_buf_idx = psEncC->ltp_mem_length; |
| NSQ->sLTP_buf_idx = psEncC->ltp_mem_length; |
| pxq = &NSQ->xq[ psEncC->ltp_mem_length ]; |
| for( k = 0; k < psEncC->nb_subfr; k++ ) { |
| A_Q12 = &PredCoef_Q12[ (( k >> 1 ) | ( 1 - LSF_interpolation_flag )) * MAX_LPC_ORDER ]; |
| B_Q14 = <PCoef_Q14[ k * LTP_ORDER ]; |
| AR_shp_Q13 = &AR_Q13[ k * MAX_SHAPE_LPC_ORDER ]; |
| |
| /* Noise shape parameters */ |
| silk_assert( HarmShapeGain_Q14[ k ] >= 0 ); |
| HarmShapeFIRPacked_Q14 = silk_RSHIFT( HarmShapeGain_Q14[ k ], 2 ); |
| HarmShapeFIRPacked_Q14 |= silk_LSHIFT( (opus_int32)silk_RSHIFT( HarmShapeGain_Q14[ k ], 1 ), 16 ); |
| |
| NSQ->rewhite_flag = 0; |
| if( psIndices->signalType == TYPE_VOICED ) { |
| /* Voiced */ |
| lag = pitchL[ k ]; |
| |
| /* Re-whitening */ |
| if( ( k & ( 3 - silk_LSHIFT( LSF_interpolation_flag, 1 ) ) ) == 0 ) { |
| /* Rewhiten with new A coefs */ |
| start_idx = psEncC->ltp_mem_length - lag - psEncC->predictLPCOrder - LTP_ORDER / 2; |
| celt_assert( start_idx > 0 ); |
| |
| silk_LPC_analysis_filter( &sLTP[ start_idx ], &NSQ->xq[ start_idx + k * psEncC->subfr_length ], |
| A_Q12, psEncC->ltp_mem_length - start_idx, psEncC->predictLPCOrder, psEncC->arch ); |
| |
| NSQ->rewhite_flag = 1; |
| NSQ->sLTP_buf_idx = psEncC->ltp_mem_length; |
| } |
| } |
| |
| silk_nsq_scale_states( psEncC, NSQ, x16, x_sc_Q10, sLTP, sLTP_Q15, k, LTP_scale_Q14, Gains_Q16, pitchL, psIndices->signalType ); |
| |
| silk_noise_shape_quantizer( NSQ, psIndices->signalType, x_sc_Q10, pulses, pxq, sLTP_Q15, 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, psEncC->shapingLPCOrder, psEncC->predictLPCOrder, psEncC->arch ); |
| |
| x16 += psEncC->subfr_length; |
| pulses += psEncC->subfr_length; |
| pxq += psEncC->subfr_length; |
| } |
| |
| /* Update lagPrev for next frame */ |
| NSQ->lagPrev = pitchL[ psEncC->nb_subfr - 1 ]; |
| |
| /* Save quantized speech and noise shaping signals */ |
| silk_memmove( NSQ->xq, &NSQ->xq[ psEncC->frame_length ], psEncC->ltp_mem_length * sizeof( opus_int16 ) ); |
| silk_memmove( NSQ->sLTP_shp_Q14, &NSQ->sLTP_shp_Q14[ psEncC->frame_length ], psEncC->ltp_mem_length * sizeof( opus_int32 ) ); |
| RESTORE_STACK; |
| } |
| |
| /***********************************/ |
| /* silk_noise_shape_quantizer */ |
| /***********************************/ |
| |
| #if !defined(OPUS_X86_MAY_HAVE_SSE4_1) |
| static OPUS_INLINE |
| #endif |
| void silk_noise_shape_quantizer( |
| silk_nsq_state *NSQ, /* I/O NSQ state */ |
| opus_int signalType, /* I Signal type */ |
| const opus_int32 x_sc_Q10[], /* I */ |
| opus_int8 pulses[], /* O */ |
| opus_int16 xq[], /* O */ |
| opus_int32 sLTP_Q15[], /* I/O LTP state */ |
| const opus_int16 a_Q12[], /* I Short term prediction coefs */ |
| const opus_int16 b_Q14[], /* I Long term prediction coefs */ |
| const opus_int16 AR_shp_Q13[], /* I Noise shaping AR coefs */ |
| opus_int lag, /* I Pitch lag */ |
| opus_int32 HarmShapeFIRPacked_Q14, /* I */ |
| opus_int Tilt_Q14, /* I Spectral tilt */ |
| opus_int32 LF_shp_Q14, /* I */ |
| opus_int32 Gain_Q16, /* I */ |
| opus_int Lambda_Q10, /* I */ |
| opus_int offset_Q10, /* I */ |
| opus_int length, /* I Input length */ |
| opus_int shapingLPCOrder, /* I Noise shaping AR filter order */ |
| opus_int predictLPCOrder, /* I Prediction filter order */ |
| int arch /* I Architecture */ |
| ) |
| { |
| opus_int i; |
| opus_int32 LTP_pred_Q13, LPC_pred_Q10, n_AR_Q12, n_LTP_Q13; |
| opus_int32 n_LF_Q12, r_Q10, rr_Q10, q1_Q0, q1_Q10, q2_Q10, rd1_Q20, rd2_Q20; |
| opus_int32 exc_Q14, LPC_exc_Q14, xq_Q14, Gain_Q10; |
| opus_int32 tmp1, tmp2, sLF_AR_shp_Q14; |
| opus_int32 *psLPC_Q14, *shp_lag_ptr, *pred_lag_ptr; |
| #ifdef silk_short_prediction_create_arch_coef |
| opus_int32 a_Q12_arch[MAX_LPC_ORDER]; |
| #endif |
| |
| shp_lag_ptr = &NSQ->sLTP_shp_Q14[ NSQ->sLTP_shp_buf_idx - lag + HARM_SHAPE_FIR_TAPS / 2 ]; |
| pred_lag_ptr = &sLTP_Q15[ NSQ->sLTP_buf_idx - lag + LTP_ORDER / 2 ]; |
| Gain_Q10 = silk_RSHIFT( Gain_Q16, 6 ); |
| |
| /* Set up short term AR state */ |
| psLPC_Q14 = &NSQ->sLPC_Q14[ NSQ_LPC_BUF_LENGTH - 1 ]; |
| |
| #ifdef silk_short_prediction_create_arch_coef |
| silk_short_prediction_create_arch_coef(a_Q12_arch, a_Q12, predictLPCOrder); |
| #endif |
| |
| for( i = 0; i < length; i++ ) { |
| /* Generate dither */ |
| NSQ->rand_seed = silk_RAND( NSQ->rand_seed ); |
| |
| /* Short-term prediction */ |
| LPC_pred_Q10 = silk_noise_shape_quantizer_short_prediction(psLPC_Q14, a_Q12, a_Q12_arch, predictLPCOrder, arch); |
| |
| /* Long-term prediction */ |
| if( signalType == TYPE_VOICED ) { |
| /* Unrolled loop */ |
| /* Avoids introducing a bias because silk_SMLAWB() always rounds to -inf */ |
| LTP_pred_Q13 = 2; |
| LTP_pred_Q13 = silk_SMLAWB( LTP_pred_Q13, pred_lag_ptr[ 0 ], b_Q14[ 0 ] ); |
| LTP_pred_Q13 = silk_SMLAWB( LTP_pred_Q13, pred_lag_ptr[ -1 ], b_Q14[ 1 ] ); |
| LTP_pred_Q13 = silk_SMLAWB( LTP_pred_Q13, pred_lag_ptr[ -2 ], b_Q14[ 2 ] ); |
| LTP_pred_Q13 = silk_SMLAWB( LTP_pred_Q13, pred_lag_ptr[ -3 ], b_Q14[ 3 ] ); |
| LTP_pred_Q13 = silk_SMLAWB( LTP_pred_Q13, pred_lag_ptr[ -4 ], b_Q14[ 4 ] ); |
| pred_lag_ptr++; |
| } else { |
| LTP_pred_Q13 = 0; |
| } |
| |
| /* Noise shape feedback */ |
| celt_assert( ( shapingLPCOrder & 1 ) == 0 ); /* check that order is even */ |
| n_AR_Q12 = silk_NSQ_noise_shape_feedback_loop(&NSQ->sDiff_shp_Q14, NSQ->sAR2_Q14, AR_shp_Q13, shapingLPCOrder, arch); |
| |
| n_AR_Q12 = silk_SMLAWB( n_AR_Q12, NSQ->sLF_AR_shp_Q14, Tilt_Q14 ); |
| |
| n_LF_Q12 = silk_SMULWB( NSQ->sLTP_shp_Q14[ NSQ->sLTP_shp_buf_idx - 1 ], LF_shp_Q14 ); |
| n_LF_Q12 = silk_SMLAWT( n_LF_Q12, NSQ->sLF_AR_shp_Q14, LF_shp_Q14 ); |
| |
| celt_assert( lag > 0 || signalType != TYPE_VOICED ); |
| |
| /* Combine prediction and noise shaping signals */ |
| tmp1 = silk_SUB32( silk_LSHIFT32( LPC_pred_Q10, 2 ), n_AR_Q12 ); /* Q12 */ |
| tmp1 = silk_SUB32( tmp1, n_LF_Q12 ); /* Q12 */ |
| if( lag > 0 ) { |
| /* Symmetric, packed FIR coefficients */ |
| n_LTP_Q13 = silk_SMULWB( silk_ADD32( shp_lag_ptr[ 0 ], shp_lag_ptr[ -2 ] ), HarmShapeFIRPacked_Q14 ); |
| n_LTP_Q13 = silk_SMLAWT( n_LTP_Q13, shp_lag_ptr[ -1 ], HarmShapeFIRPacked_Q14 ); |
| n_LTP_Q13 = silk_LSHIFT( n_LTP_Q13, 1 ); |
| shp_lag_ptr++; |
| |
| tmp2 = silk_SUB32( LTP_pred_Q13, n_LTP_Q13 ); /* Q13 */ |
| tmp1 = silk_ADD_LSHIFT32( tmp2, tmp1, 1 ); /* Q13 */ |
| tmp1 = silk_RSHIFT_ROUND( tmp1, 3 ); /* Q10 */ |
| } else { |
| tmp1 = silk_RSHIFT_ROUND( tmp1, 2 ); /* Q10 */ |
| } |
| |
| r_Q10 = silk_SUB32( x_sc_Q10[ i ], tmp1 ); /* residual error Q10 */ |
| |
| /* Flip sign depending on dither */ |
| if( NSQ->rand_seed < 0 ) { |
| r_Q10 = -r_Q10; |
| } |
| r_Q10 = silk_LIMIT_32( r_Q10, -(31 << 10), 30 << 10 ); |
| |
| /* Find two quantization level candidates and measure their rate-distortion */ |
| q1_Q10 = silk_SUB32( r_Q10, offset_Q10 ); |
| q1_Q0 = silk_RSHIFT( q1_Q10, 10 ); |
| if (Lambda_Q10 > 2048) { |
| /* For aggressive RDO, the bias becomes more than one pulse. */ |
| int rdo_offset = Lambda_Q10/2 - 512; |
| if (q1_Q10 > rdo_offset) { |
| q1_Q0 = silk_RSHIFT( q1_Q10 - rdo_offset, 10 ); |
| } else if (q1_Q10 < -rdo_offset) { |
| q1_Q0 = silk_RSHIFT( q1_Q10 + rdo_offset, 10 ); |
| } else if (q1_Q10 < 0) { |
| q1_Q0 = -1; |
| } else { |
| q1_Q0 = 0; |
| } |
| } |
| if( q1_Q0 > 0 ) { |
| q1_Q10 = silk_SUB32( silk_LSHIFT( q1_Q0, 10 ), QUANT_LEVEL_ADJUST_Q10 ); |
| q1_Q10 = silk_ADD32( q1_Q10, offset_Q10 ); |
| q2_Q10 = silk_ADD32( q1_Q10, 1024 ); |
| rd1_Q20 = silk_SMULBB( q1_Q10, Lambda_Q10 ); |
| rd2_Q20 = silk_SMULBB( q2_Q10, Lambda_Q10 ); |
| } else if( q1_Q0 == 0 ) { |
| q1_Q10 = offset_Q10; |
| q2_Q10 = silk_ADD32( q1_Q10, 1024 - QUANT_LEVEL_ADJUST_Q10 ); |
| rd1_Q20 = silk_SMULBB( q1_Q10, Lambda_Q10 ); |
| rd2_Q20 = silk_SMULBB( q2_Q10, Lambda_Q10 ); |
| } else if( q1_Q0 == -1 ) { |
| q2_Q10 = offset_Q10; |
| q1_Q10 = silk_SUB32( q2_Q10, 1024 - QUANT_LEVEL_ADJUST_Q10 ); |
| rd1_Q20 = silk_SMULBB( -q1_Q10, Lambda_Q10 ); |
| rd2_Q20 = silk_SMULBB( q2_Q10, Lambda_Q10 ); |
| } else { /* Q1_Q0 < -1 */ |
| q1_Q10 = silk_ADD32( silk_LSHIFT( q1_Q0, 10 ), QUANT_LEVEL_ADJUST_Q10 ); |
| q1_Q10 = silk_ADD32( q1_Q10, offset_Q10 ); |
| q2_Q10 = silk_ADD32( q1_Q10, 1024 ); |
| rd1_Q20 = silk_SMULBB( -q1_Q10, Lambda_Q10 ); |
| rd2_Q20 = silk_SMULBB( -q2_Q10, Lambda_Q10 ); |
| } |
| rr_Q10 = silk_SUB32( r_Q10, q1_Q10 ); |
| rd1_Q20 = silk_SMLABB( rd1_Q20, rr_Q10, rr_Q10 ); |
| rr_Q10 = silk_SUB32( r_Q10, q2_Q10 ); |
| rd2_Q20 = silk_SMLABB( rd2_Q20, rr_Q10, rr_Q10 ); |
| |
| if( rd2_Q20 < rd1_Q20 ) { |
| q1_Q10 = q2_Q10; |
| } |
| |
| pulses[ i ] = (opus_int8)silk_RSHIFT_ROUND( q1_Q10, 10 ); |
| |
| /* Excitation */ |
| exc_Q14 = silk_LSHIFT( q1_Q10, 4 ); |
| if ( NSQ->rand_seed < 0 ) { |
| exc_Q14 = -exc_Q14; |
| } |
| |
| /* Add predictions */ |
| LPC_exc_Q14 = silk_ADD_LSHIFT32( exc_Q14, LTP_pred_Q13, 1 ); |
| xq_Q14 = silk_ADD_LSHIFT32( LPC_exc_Q14, LPC_pred_Q10, 4 ); |
| |
| /* Scale XQ back to normal level before saving */ |
| xq[ i ] = (opus_int16)silk_SAT16( silk_RSHIFT_ROUND( silk_SMULWW( xq_Q14, Gain_Q10 ), 8 ) ); |
| |
| /* Update states */ |
| psLPC_Q14++; |
| *psLPC_Q14 = xq_Q14; |
| NSQ->sDiff_shp_Q14 = silk_SUB_LSHIFT32( xq_Q14, x_sc_Q10[ i ], 4 ); |
| sLF_AR_shp_Q14 = silk_SUB_LSHIFT32( NSQ->sDiff_shp_Q14, n_AR_Q12, 2 ); |
| NSQ->sLF_AR_shp_Q14 = sLF_AR_shp_Q14; |
| |
| NSQ->sLTP_shp_Q14[ NSQ->sLTP_shp_buf_idx ] = silk_SUB_LSHIFT32( sLF_AR_shp_Q14, n_LF_Q12, 2 ); |
| sLTP_Q15[ NSQ->sLTP_buf_idx ] = silk_LSHIFT( LPC_exc_Q14, 1 ); |
| NSQ->sLTP_shp_buf_idx++; |
| NSQ->sLTP_buf_idx++; |
| |
| /* Make dither dependent on quantized signal */ |
| NSQ->rand_seed = silk_ADD32_ovflw( NSQ->rand_seed, pulses[ i ] ); |
| } |
| |
| /* Update LPC synth buffer */ |
| silk_memcpy( NSQ->sLPC_Q14, &NSQ->sLPC_Q14[ length ], NSQ_LPC_BUF_LENGTH * sizeof( opus_int32 ) ); |
| } |
| |
| static OPUS_INLINE void silk_nsq_scale_states( |
| const silk_encoder_state *psEncC, /* I Encoder State */ |
| silk_nsq_state *NSQ, /* I/O NSQ state */ |
| const opus_int16 x16[], /* I input */ |
| opus_int32 x_sc_Q10[], /* O input scaled with 1/Gain */ |
| const opus_int16 sLTP[], /* I re-whitened LTP state in Q0 */ |
| opus_int32 sLTP_Q15[], /* O LTP state matching scaled input */ |
| opus_int subfr, /* I subframe number */ |
| const opus_int LTP_scale_Q14, /* I */ |
| const opus_int32 Gains_Q16[ MAX_NB_SUBFR ], /* I */ |
| const opus_int pitchL[ MAX_NB_SUBFR ], /* I Pitch lag */ |
| const opus_int signal_type /* I Signal type */ |
| ) |
| { |
| opus_int i, lag; |
| opus_int32 gain_adj_Q16, inv_gain_Q31, inv_gain_Q26; |
| |
| lag = pitchL[ subfr ]; |
| inv_gain_Q31 = silk_INVERSE32_varQ( silk_max( Gains_Q16[ subfr ], 1 ), 47 ); |
| silk_assert( inv_gain_Q31 != 0 ); |
| |
| /* Scale input */ |
| inv_gain_Q26 = silk_RSHIFT_ROUND( inv_gain_Q31, 5 ); |
| for( i = 0; i < psEncC->subfr_length; i++ ) { |
| x_sc_Q10[ i ] = silk_SMULWW( x16[ i ], inv_gain_Q26 ); |
| } |
| |
| /* After rewhitening the LTP state is un-scaled, so scale with inv_gain_Q16 */ |
| if( NSQ->rewhite_flag ) { |
| if( subfr == 0 ) { |
| /* Do LTP downscaling */ |
| inv_gain_Q31 = silk_LSHIFT( silk_SMULWB( inv_gain_Q31, LTP_scale_Q14 ), 2 ); |
| } |
| for( i = NSQ->sLTP_buf_idx - lag - LTP_ORDER / 2; i < NSQ->sLTP_buf_idx; i++ ) { |
| silk_assert( i < MAX_FRAME_LENGTH ); |
| sLTP_Q15[ i ] = silk_SMULWB( inv_gain_Q31, sLTP[ i ] ); |
| } |
| } |
| |
| /* Adjust for changing gain */ |
| if( Gains_Q16[ subfr ] != NSQ->prev_gain_Q16 ) { |
| gain_adj_Q16 = silk_DIV32_varQ( NSQ->prev_gain_Q16, Gains_Q16[ subfr ], 16 ); |
| |
| /* Scale long-term shaping state */ |
| for( i = NSQ->sLTP_shp_buf_idx - psEncC->ltp_mem_length; i < NSQ->sLTP_shp_buf_idx; i++ ) { |
| NSQ->sLTP_shp_Q14[ i ] = silk_SMULWW( gain_adj_Q16, NSQ->sLTP_shp_Q14[ i ] ); |
| } |
| |
| /* Scale long-term prediction state */ |
| if( signal_type == TYPE_VOICED && NSQ->rewhite_flag == 0 ) { |
| for( i = NSQ->sLTP_buf_idx - lag - LTP_ORDER / 2; i < NSQ->sLTP_buf_idx; i++ ) { |
| sLTP_Q15[ i ] = silk_SMULWW( gain_adj_Q16, sLTP_Q15[ i ] ); |
| } |
| } |
| |
| NSQ->sLF_AR_shp_Q14 = silk_SMULWW( gain_adj_Q16, NSQ->sLF_AR_shp_Q14 ); |
| NSQ->sDiff_shp_Q14 = silk_SMULWW( gain_adj_Q16, NSQ->sDiff_shp_Q14 ); |
| |
| /* Scale short-term prediction and shaping states */ |
| for( i = 0; i < NSQ_LPC_BUF_LENGTH; i++ ) { |
| NSQ->sLPC_Q14[ i ] = silk_SMULWW( gain_adj_Q16, NSQ->sLPC_Q14[ i ] ); |
| } |
| for( i = 0; i < MAX_SHAPE_LPC_ORDER; i++ ) { |
| NSQ->sAR2_Q14[ i ] = silk_SMULWW( gain_adj_Q16, NSQ->sAR2_Q14[ i ] ); |
| } |
| |
| /* Save inverse gain */ |
| NSQ->prev_gain_Q16 = Gains_Q16[ subfr ]; |
| } |
| } |
