/src/opus/silk/decode_core.c

Source
/***********************************************************************
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"

/**********************************************************/
/* Core decoder. Performs inverse NSQ operation LTP + LPC */
/**********************************************************/
void silk_decode_core(
    silk_decoder_state          *psDec,                         /* I/O  Decoder state                               */
    silk_decoder_control        *psDecCtrl,                     /* I    Decoder control                             */
    opus_int16                  xq[],                           /* O    Decoded speech                              */
    const opus_int16            pulses[ MAX_FRAME_LENGTH ],     /* I    Pulse signal                                */
    int                         arch                            /* I    Run-time architecture                       */
)
{
    opus_int   i, k, lag = 0, start_idx, sLTP_buf_idx, NLSF_interpolation_flag, signalType;
    opus_int16 *A_Q12, *B_Q14, *pxq, A_Q12_tmp[ MAX_LPC_ORDER ];
    VARDECL( opus_int16, sLTP );
    VARDECL( opus_int32, sLTP_Q15 );
    opus_int32 LTP_pred_Q13, LPC_pred_Q10, Gain_Q10, inv_gain_Q31, gain_adj_Q16, rand_seed, offset_Q10;
    opus_int32 *pred_lag_ptr, *pexc_Q14, *pres_Q14;
    VARDECL( opus_int32, res_Q14 );
    VARDECL( opus_int32, sLPC_Q14 );
    SAVE_STACK;

    silk_assert( psDec->prev_gain_Q16 != 0 );

    ALLOC( sLTP, psDec->ltp_mem_length, opus_int16 );
    ALLOC( sLTP_Q15, psDec->ltp_mem_length + psDec->frame_length, opus_int32 );
    ALLOC( res_Q14, psDec->subfr_length, opus_int32 );
    /* Work around a clang bug (verified with clang 6.0 through clang 20.1.0) that causes the last
       memset to be flagged as an invalid read by valgrind (not caught by asan). */
#if defined(__clang__) && defined(VAR_ARRAYS)
    ALLOC( sLPC_Q14, MAX_SUB_FRAME_LENGTH + MAX_LPC_ORDER, opus_int32 );
#else
    ALLOC( sLPC_Q14, psDec->subfr_length + MAX_LPC_ORDER, opus_int32 );
#endif

    offset_Q10 = silk_Quantization_Offsets_Q10[ psDec->indices.signalType >> 1 ][ psDec->indices.quantOffsetType ];

    if( psDec->indices.NLSFInterpCoef_Q2 < 1 << 2 ) {
        NLSF_interpolation_flag = 1;
    } else {
        NLSF_interpolation_flag = 0;
    }

    /* Decode excitation */
    rand_seed = psDec->indices.Seed;
    for( i = 0; i < psDec->frame_length; i++ ) {
        rand_seed = silk_RAND( rand_seed );
        psDec->exc_Q14[ i ] = silk_LSHIFT( (opus_int32)pulses[ i ], 14 );
        if( psDec->exc_Q14[ i ] > 0 ) {
            psDec->exc_Q14[ i ] -= QUANT_LEVEL_ADJUST_Q10 << 4;
        } else
        if( psDec->exc_Q14[ i ] < 0 ) {
            psDec->exc_Q14[ i ] += QUANT_LEVEL_ADJUST_Q10 << 4;
        }
        psDec->exc_Q14[ i ] += offset_Q10 << 4;
        if( rand_seed < 0 ) {
           psDec->exc_Q14[ i ] = -psDec->exc_Q14[ i ];
        }

        rand_seed = silk_ADD32_ovflw( rand_seed, pulses[ i ] );
    }

    /* Copy LPC state */
    silk_memcpy( sLPC_Q14, psDec->sLPC_Q14_buf, MAX_LPC_ORDER * sizeof( opus_int32 ) );

    pexc_Q14 = psDec->exc_Q14;
    pxq      = xq;
    sLTP_buf_idx = psDec->ltp_mem_length;
    /* Loop over subframes */
    for( k = 0; k < psDec->nb_subfr; k++ ) {
        pres_Q14 = res_Q14;
        A_Q12 = psDecCtrl->PredCoef_Q12[ k >> 1 ];

        /* Preload LPC coefficients to array on stack. Gives small performance gain */
        silk_memcpy( A_Q12_tmp, A_Q12, psDec->LPC_order * sizeof( opus_int16 ) );
        B_Q14        = &psDecCtrl->LTPCoef_Q14[ k * LTP_ORDER ];
        signalType   = psDec->indices.signalType;

        Gain_Q10     = silk_RSHIFT( psDecCtrl->Gains_Q16[ k ], 6 );
        inv_gain_Q31 = silk_INVERSE32_varQ( psDecCtrl->Gains_Q16[ k ], 47 );

        /* Calculate gain adjustment factor */
        if( psDecCtrl->Gains_Q16[ k ] != psDec->prev_gain_Q16 ) {
            gain_adj_Q16 =  silk_DIV32_varQ( psDec->prev_gain_Q16, psDecCtrl->Gains_Q16[ k ], 16 );

            /* Scale short term state */
            for( i = 0; i < MAX_LPC_ORDER; i++ ) {
                sLPC_Q14[ i ] = silk_SMULWW( gain_adj_Q16, sLPC_Q14[ i ] );
            }
        } else {
            gain_adj_Q16 = (opus_int32)1 << 16;
        }

        /* Save inv_gain */
        silk_assert( inv_gain_Q31 != 0 );
        psDec->prev_gain_Q16 = psDecCtrl->Gains_Q16[ k ];

        /* Avoid abrupt transition from voiced PLC to unvoiced normal decoding */
        if( psDec->lossCnt && psDec->prevSignalType == TYPE_VOICED &&
            psDec->indices.signalType != TYPE_VOICED && k < MAX_NB_SUBFR/2 ) {

            silk_memset( B_Q14, 0, LTP_ORDER * sizeof( opus_int16 ) );
            B_Q14[ LTP_ORDER/2 ] = SILK_FIX_CONST( 0.25, 14 );

            signalType = TYPE_VOICED;
            psDecCtrl->pitchL[ k ] = psDec->lagPrev;
        }

        if( signalType == TYPE_VOICED ) {
            /* Voiced */
            lag = psDecCtrl->pitchL[ k ];

            /* Re-whitening */
            if( k == 0 || ( k == 2 && NLSF_interpolation_flag ) ) {
                /* Rewhiten with new A coefs */
                start_idx = psDec->ltp_mem_length - lag - psDec->LPC_order - LTP_ORDER / 2;
                celt_assert( start_idx > 0 );

                if( k == 2 ) {
                    silk_memcpy( &psDec->outBuf[ psDec->ltp_mem_length ], xq, 2 * psDec->subfr_length * sizeof( opus_int16 ) );
                }

                silk_LPC_analysis_filter( &sLTP[ start_idx ], &psDec->outBuf[ start_idx + k * psDec->subfr_length ],
                    A_Q12, psDec->ltp_mem_length - start_idx, psDec->LPC_order, arch );

                /* After rewhitening the LTP state is unscaled */
                if( k == 0 ) {
                    /* Do LTP downscaling to reduce inter-packet dependency */
                    inv_gain_Q31 = silk_LSHIFT( silk_SMULWB( inv_gain_Q31, psDecCtrl->LTP_scale_Q14 ), 2 );
                }
                for( i = 0; i < lag + LTP_ORDER/2; i++ ) {
                    sLTP_Q15[ sLTP_buf_idx - i - 1 ] = silk_SMULWB( inv_gain_Q31, sLTP[ psDec->ltp_mem_length - i - 1 ] );
                }
            } else {
                /* Update LTP state when Gain changes */
                if( gain_adj_Q16 != (opus_int32)1 << 16 ) {
                    for( i = 0; i < lag + LTP_ORDER/2; i++ ) {
                        sLTP_Q15[ sLTP_buf_idx - i - 1 ] = silk_SMULWW( gain_adj_Q16, sLTP_Q15[ sLTP_buf_idx - i - 1 ] );
                    }
                }
            }
        }

        /* Long-term prediction */
        if( signalType == TYPE_VOICED ) {
            /* Set up pointer */
            pred_lag_ptr = &sLTP_Q15[ sLTP_buf_idx - lag + LTP_ORDER / 2 ];
            for( i = 0; i < psDec->subfr_length; i++ ) {
                /* 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++;

                /* Generate LPC excitation */
                pres_Q14[ i ] = silk_ADD_LSHIFT32( pexc_Q14[ i ], LTP_pred_Q13, 1 );

                /* Update states */
                sLTP_Q15[ sLTP_buf_idx ] = silk_LSHIFT( pres_Q14[ i ], 1 );
                sLTP_buf_idx++;
            }
        } else {
            pres_Q14 = pexc_Q14;
        }

        for( i = 0; i < psDec->subfr_length; i++ ) {
            /* Short-term prediction */
            celt_assert( psDec->LPC_order == 10 || psDec->LPC_order == 16 );
            /* Avoids introducing a bias because silk_SMLAWB() always rounds to -inf */
            LPC_pred_Q10 = silk_RSHIFT( psDec->LPC_order, 1 );
            LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i -  1 ], A_Q12_tmp[ 0 ] );
            LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i -  2 ], A_Q12_tmp[ 1 ] );
            LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i -  3 ], A_Q12_tmp[ 2 ] );
            LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i -  4 ], A_Q12_tmp[ 3 ] );
            LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i -  5 ], A_Q12_tmp[ 4 ] );
            LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i -  6 ], A_Q12_tmp[ 5 ] );
            LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i -  7 ], A_Q12_tmp[ 6 ] );
            LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i -  8 ], A_Q12_tmp[ 7 ] );
            LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i -  9 ], A_Q12_tmp[ 8 ] );
            LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i - 10 ], A_Q12_tmp[ 9 ] );
            if( psDec->LPC_order == 16 ) {
                LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i - 11 ], A_Q12_tmp[ 10 ] );
                LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i - 12 ], A_Q12_tmp[ 11 ] );
                LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i - 13 ], A_Q12_tmp[ 12 ] );
                LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i - 14 ], A_Q12_tmp[ 13 ] );
                LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i - 15 ], A_Q12_tmp[ 14 ] );
                LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i - 16 ], A_Q12_tmp[ 15 ] );
            }

            /* Add prediction to LPC excitation */
            sLPC_Q14[ MAX_LPC_ORDER + i ] = silk_ADD_SAT32( pres_Q14[ i ], silk_LSHIFT_SAT32( LPC_pred_Q10, 4 ) );

            /* Scale with gain */
            pxq[ i ] = (opus_int16)silk_SAT16( silk_RSHIFT_ROUND( silk_SMULWW( sLPC_Q14[ MAX_LPC_ORDER + i ], Gain_Q10 ), 8 ) );
        }

        /* Update LPC filter state */
        silk_memcpy( sLPC_Q14, &sLPC_Q14[ psDec->subfr_length ], MAX_LPC_ORDER * sizeof( opus_int32 ) );
        pexc_Q14 += psDec->subfr_length;
        pxq      += psDec->subfr_length;
    }

    /* Save LPC state */
    silk_memcpy( psDec->sLPC_Q14_buf, sLPC_Q14, MAX_LPC_ORDER * sizeof( opus_int32 ) );
    RESTORE_STACK;
}

Coverage Report

Created: 2026-10-17 07:52

Line	Count	Source
1		/***********************************************************************
2		Copyright (c) 2006-2011, Skype Limited. All rights reserved.
3		Redistribution and use in source and binary forms, with or without
4		modification, are permitted provided that the following conditions
5		are met:
6		- Redistributions of source code must retain the above copyright notice,
7		this list of conditions and the following disclaimer.
8		- Redistributions in binary form must reproduce the above copyright
9		notice, this list of conditions and the following disclaimer in the
10		documentation and/or other materials provided with the distribution.
11		- Neither the name of Internet Society, IETF or IETF Trust, nor the
12		names of specific contributors, may be used to endorse or promote
13		products derived from this software without specific prior written
14		permission.
15		THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
16		AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17		IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18		ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
19		LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
20		CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
21		SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
22		INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
23		CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
24		ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
25		POSSIBILITY OF SUCH DAMAGE.
26		***********************************************************************/
27
28		#ifdef HAVE_CONFIG_H
29		#include "config.h"
30		#endif
31
32		#include "main.h"
33		#include "stack_alloc.h"
34
35		/**********************************************************/
36		/* Core decoder. Performs inverse NSQ operation LTP + LPC */
37		/**********************************************************/
38		void silk_decode_core(
39		silk_decoder_state psDec, / I/O Decoder state */
40		silk_decoder_control psDecCtrl, / I Decoder control */
41		opus_int16 xq[], /* O Decoded speech */
42		const opus_int16 pulses[ MAX_FRAME_LENGTH ], /* I Pulse signal */
43		int arch /* I Run-time architecture */
44		)
45	490k	{
46	490k	opus_int i, k, lag = 0, start_idx, sLTP_buf_idx, NLSF_interpolation_flag, signalType;
47	490k	opus_int16 A_Q12, B_Q14, *pxq, A_Q12_tmp[ MAX_LPC_ORDER ];
48	490k	VARDECL( opus_int16, sLTP );
49	490k	VARDECL( opus_int32, sLTP_Q15 );
50	490k	opus_int32 LTP_pred_Q13, LPC_pred_Q10, Gain_Q10, inv_gain_Q31, gain_adj_Q16, rand_seed, offset_Q10;
51	490k	opus_int32 pred_lag_ptr, pexc_Q14, *pres_Q14;
52	490k	VARDECL( opus_int32, res_Q14 );
53	490k	VARDECL( opus_int32, sLPC_Q14 );
54	490k	SAVE_STACK;
55
56	490k	silk_assert( psDec->prev_gain_Q16 != 0 );
57
58	490k	ALLOC( sLTP, psDec->ltp_mem_length, opus_int16 );
59	490k	ALLOC( sLTP_Q15, psDec->ltp_mem_length + psDec->frame_length, opus_int32 );
60	490k	ALLOC( res_Q14, psDec->subfr_length, opus_int32 );
61		/* Work around a clang bug (verified with clang 6.0 through clang 20.1.0) that causes the last
62		memset to be flagged as an invalid read by valgrind (not caught by asan). */
63	490k	#if defined(__clang__) && defined(VAR_ARRAYS)
64	490k	ALLOC( sLPC_Q14, MAX_SUB_FRAME_LENGTH + MAX_LPC_ORDER, opus_int32 );
65		#else
66		ALLOC( sLPC_Q14, psDec->subfr_length + MAX_LPC_ORDER, opus_int32 );
67		#endif
68
69	490k	offset_Q10 = silk_Quantization_Offsets_Q10[ psDec->indices.signalType >> 1 ][ psDec->indices.quantOffsetType ];
70
71	490k	if( psDec->indices.NLSFInterpCoef_Q2 < 1 << 2 ) {
72	94.2k	NLSF_interpolation_flag = 1;
73	396k	} else {
74	396k	NLSF_interpolation_flag = 0;
75	396k	}
76
77		/* Decode excitation */
78	490k	rand_seed = psDec->indices.Seed;
79	107M	for( i = 0; i < psDec->frame_length; i++ ) {
80	107M	rand_seed = silk_RAND( rand_seed );
81	107M	psDec->exc_Q14[ i ] = silk_LSHIFT( (opus_int32)pulses[ i ], 14 );
82	107M	if( psDec->exc_Q14[ i ] > 0 ) {
83	6.45M	psDec->exc_Q14[ i ] -= QUANT_LEVEL_ADJUST_Q10 << 4;
84	6.45M	} else
85	101M	if( psDec->exc_Q14[ i ] < 0 ) {
86	16.0M	psDec->exc_Q14[ i ] += QUANT_LEVEL_ADJUST_Q10 << 4;
87	16.0M	}
88	107M	psDec->exc_Q14[ i ] += offset_Q10 << 4;
89	107M	if( rand_seed < 0 ) {
90	53.4M	psDec->exc_Q14[ i ] = -psDec->exc_Q14[ i ];
91	53.4M	}
92
93	107M	rand_seed = silk_ADD32_ovflw( rand_seed, pulses[ i ] );
94	107M	}
95
96		/* Copy LPC state */
97	490k	silk_memcpy( sLPC_Q14, psDec->sLPC_Q14_buf, MAX_LPC_ORDER * sizeof( opus_int32 ) );
98
99	490k	pexc_Q14 = psDec->exc_Q14;
100	490k	pxq = xq;
101	490k	sLTP_buf_idx = psDec->ltp_mem_length;
102		/* Loop over subframes */
103	2.18M	for( k = 0; k < psDec->nb_subfr; k++ ) {
104	1.69M	pres_Q14 = res_Q14;
105	1.69M	A_Q12 = psDecCtrl->PredCoef_Q12[ k >> 1 ];
106
107		/* Preload LPC coefficients to array on stack. Gives small performance gain */
108	1.69M	silk_memcpy( A_Q12_tmp, A_Q12, psDec->LPC_order * sizeof( opus_int16 ) );
109	1.69M	B_Q14 = &psDecCtrl->LTPCoef_Q14[ k * LTP_ORDER ];
110	1.69M	signalType = psDec->indices.signalType;
111
112	1.69M	Gain_Q10 = silk_RSHIFT( psDecCtrl->Gains_Q16[ k ], 6 );
113	1.69M	inv_gain_Q31 = silk_INVERSE32_varQ( psDecCtrl->Gains_Q16[ k ], 47 );
114
115		/* Calculate gain adjustment factor */
116	1.69M	if( psDecCtrl->Gains_Q16[ k ] != psDec->prev_gain_Q16 ) {
117	891k	gain_adj_Q16 = silk_DIV32_varQ( psDec->prev_gain_Q16, psDecCtrl->Gains_Q16[ k ], 16 );
118
119		/* Scale short term state */
120	15.1M	for( i = 0; i < MAX_LPC_ORDER; i++ ) {
121	14.2M	sLPC_Q14[ i ] = silk_SMULWW( gain_adj_Q16, sLPC_Q14[ i ] );
122	14.2M	}
123	891k	} else {
124	803k	gain_adj_Q16 = (opus_int32)1 << 16;
125	803k	}
126
127		/* Save inv_gain */
128	1.69M	silk_assert( inv_gain_Q31 != 0 );
129	1.69M	psDec->prev_gain_Q16 = psDecCtrl->Gains_Q16[ k ];
130
131		/* Avoid abrupt transition from voiced PLC to unvoiced normal decoding */
132	1.69M	if( psDec->lossCnt && psDec->prevSignalType == TYPE_VOICED &&
133	24.5k	psDec->indices.signalType != TYPE_VOICED && k < MAX_NB_SUBFR/2 ) {
134
135	9.03k	silk_memset( B_Q14, 0, LTP_ORDER * sizeof( opus_int16 ) );
136	9.03k	B_Q14[ LTP_ORDER/2 ] = SILK_FIX_CONST( 0.25, 14 );
137
138	9.03k	signalType = TYPE_VOICED;
139	9.03k	psDecCtrl->pitchL[ k ] = psDec->lagPrev;
140	9.03k	}
141
142	1.69M	if( signalType == TYPE_VOICED ) {
143		/* Voiced */
144	531k	lag = psDecCtrl->pitchL[ k ];
145
146		/* Re-whitening */
147	531k	if( k == 0 \|\| ( k == 2 && NLSF_interpolation_flag ) ) {
148		/* Rewhiten with new A coefs */
149	171k	start_idx = psDec->ltp_mem_length - lag - psDec->LPC_order - LTP_ORDER / 2;
150	171k	celt_assert( start_idx > 0 );
151
152	171k	if( k == 2 ) {
153	24.4k	silk_memcpy( &psDec->outBuf[ psDec->ltp_mem_length ], xq, 2 * psDec->subfr_length * sizeof( opus_int16 ) );
154	24.4k	}
155
156	171k	silk_LPC_analysis_filter( &sLTP[ start_idx ], &psDec->outBuf[ start_idx + k * psDec->subfr_length ],
157	171k	A_Q12, psDec->ltp_mem_length - start_idx, psDec->LPC_order, arch );
158
159		/* After rewhitening the LTP state is unscaled */
160	171k	if( k == 0 ) {
161		/* Do LTP downscaling to reduce inter-packet dependency */
162	147k	inv_gain_Q31 = silk_LSHIFT( silk_SMULWB( inv_gain_Q31, psDecCtrl->LTP_scale_Q14 ), 2 );
163	147k	}
164	16.2M	for( i = 0; i < lag + LTP_ORDER/2; i++ ) {
165	16.0M	sLTP_Q15[ sLTP_buf_idx - i - 1 ] = silk_SMULWB( inv_gain_Q31, sLTP[ psDec->ltp_mem_length - i - 1 ] );
166	16.0M	}
167	359k	} else {
168		/* Update LTP state when Gain changes */
169	359k	if( gain_adj_Q16 != (opus_int32)1 << 16 ) {
170	15.2M	for( i = 0; i < lag + LTP_ORDER/2; i++ ) {
171	15.0M	sLTP_Q15[ sLTP_buf_idx - i - 1 ] = silk_SMULWW( gain_adj_Q16, sLTP_Q15[ sLTP_buf_idx - i - 1 ] );
172	15.0M	}
173	163k	}
174	359k	}
175	531k	}
176
177		/* Long-term prediction */
178	1.69M	if( signalType == TYPE_VOICED ) {
179		/* Set up pointer */
180	531k	pred_lag_ptr = &sLTP_Q15[ sLTP_buf_idx - lag + LTP_ORDER / 2 ];
181	34.7M	for( i = 0; i < psDec->subfr_length; i++ ) {
182		/* Unrolled loop */
183		/* Avoids introducing a bias because silk_SMLAWB() always rounds to -inf */
184	34.1M	LTP_pred_Q13 = 2;
185	34.1M	LTP_pred_Q13 = silk_SMLAWB( LTP_pred_Q13, pred_lag_ptr[ 0 ], B_Q14[ 0 ] );
186	34.1M	LTP_pred_Q13 = silk_SMLAWB( LTP_pred_Q13, pred_lag_ptr[ -1 ], B_Q14[ 1 ] );
187	34.1M	LTP_pred_Q13 = silk_SMLAWB( LTP_pred_Q13, pred_lag_ptr[ -2 ], B_Q14[ 2 ] );
188	34.1M	LTP_pred_Q13 = silk_SMLAWB( LTP_pred_Q13, pred_lag_ptr[ -3 ], B_Q14[ 3 ] );
189	34.1M	LTP_pred_Q13 = silk_SMLAWB( LTP_pred_Q13, pred_lag_ptr[ -4 ], B_Q14[ 4 ] );
190	34.1M	pred_lag_ptr++;
191
192		/* Generate LPC excitation */
193	34.1M	pres_Q14[ i ] = silk_ADD_LSHIFT32( pexc_Q14[ i ], LTP_pred_Q13, 1 );
194
195		/* Update states */
196	34.1M	sLTP_Q15[ sLTP_buf_idx ] = silk_LSHIFT( pres_Q14[ i ], 1 );
197	34.1M	sLTP_buf_idx++;
198	34.1M	}
199	1.16M	} else {
200	1.16M	pres_Q14 = pexc_Q14;
201	1.16M	}
202
203	109M	for( i = 0; i < psDec->subfr_length; i++ ) {
204		/* Short-term prediction */
205	107M	celt_assert( psDec->LPC_order == 10 \|\| psDec->LPC_order == 16 );
206		/* Avoids introducing a bias because silk_SMLAWB() always rounds to -inf */
207	107M	LPC_pred_Q10 = silk_RSHIFT( psDec->LPC_order, 1 );
208	107M	LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i - 1 ], A_Q12_tmp[ 0 ] );
209	107M	LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i - 2 ], A_Q12_tmp[ 1 ] );
210	107M	LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i - 3 ], A_Q12_tmp[ 2 ] );
211	107M	LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i - 4 ], A_Q12_tmp[ 3 ] );
212	107M	LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i - 5 ], A_Q12_tmp[ 4 ] );
213	107M	LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i - 6 ], A_Q12_tmp[ 5 ] );
214	107M	LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i - 7 ], A_Q12_tmp[ 6 ] );
215	107M	LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i - 8 ], A_Q12_tmp[ 7 ] );
216	107M	LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i - 9 ], A_Q12_tmp[ 8 ] );
217	107M	LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i - 10 ], A_Q12_tmp[ 9 ] );
218	107M	if( psDec->LPC_order == 16 ) {
219	63.5M	LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i - 11 ], A_Q12_tmp[ 10 ] );
220	63.5M	LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i - 12 ], A_Q12_tmp[ 11 ] );
221	63.5M	LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i - 13 ], A_Q12_tmp[ 12 ] );
222	63.5M	LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i - 14 ], A_Q12_tmp[ 13 ] );
223	63.5M	LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i - 15 ], A_Q12_tmp[ 14 ] );
224	63.5M	LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i - 16 ], A_Q12_tmp[ 15 ] );
225	63.5M	}
226
227		/* Add prediction to LPC excitation */
228	107M	sLPC_Q14[ MAX_LPC_ORDER + i ] = silk_ADD_SAT32( pres_Q14[ i ], silk_LSHIFT_SAT32( LPC_pred_Q10, 4 ) );
229
230		/* Scale with gain */
231	107M	pxq[ i ] = (opus_int16)silk_SAT16( silk_RSHIFT_ROUND( silk_SMULWW( sLPC_Q14[ MAX_LPC_ORDER + i ], Gain_Q10 ), 8 ) );
232	107M	}
233
234		/* Update LPC filter state */
235	1.69M	silk_memcpy( sLPC_Q14, &sLPC_Q14[ psDec->subfr_length ], MAX_LPC_ORDER * sizeof( opus_int32 ) );
236	1.69M	pexc_Q14 += psDec->subfr_length;
237	1.69M	pxq += psDec->subfr_length;
238	1.69M	}
239
240		/* Save LPC state */
241	490k	silk_memcpy( psDec->sLPC_Q14_buf, sLPC_Q14, MAX_LPC_ORDER * sizeof( opus_int32 ) );
242	490k	RESTORE_STACK;
243	490k	}