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Diffstat (limited to 'src/opus-1.0.2/silk/fixed/burg_modified_FIX.c')
| -rw-r--r-- | src/opus-1.0.2/silk/fixed/burg_modified_FIX.c | 269 |
1 files changed, 0 insertions, 269 deletions
diff --git a/src/opus-1.0.2/silk/fixed/burg_modified_FIX.c b/src/opus-1.0.2/silk/fixed/burg_modified_FIX.c deleted file mode 100644 index 26a66b1c..00000000 --- a/src/opus-1.0.2/silk/fixed/burg_modified_FIX.c +++ /dev/null @@ -1,269 +0,0 @@ -/*********************************************************************** -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 "SigProc_FIX.h" -#include "define.h" -#include "tuning_parameters.h" - -#define MAX_FRAME_SIZE 384 /* subfr_length * nb_subfr = ( 0.005 * 16000 + 16 ) * 4 = 384 */ - -#define QA 25 -#define N_BITS_HEAD_ROOM 2 -#define MIN_RSHIFTS -16 -#define MAX_RSHIFTS (32 - QA) - -/* Compute reflection coefficients from input signal */ -void silk_burg_modified( - opus_int32 *res_nrg, /* O Residual energy */ - opus_int *res_nrg_Q, /* O Residual energy Q value */ - opus_int32 A_Q16[], /* O Prediction coefficients (length order) */ - const opus_int16 x[], /* I Input signal, length: nb_subfr * ( D + subfr_length ) */ - const opus_int32 minInvGain_Q30, /* I Inverse of max prediction gain */ - const opus_int subfr_length, /* I Input signal subframe length (incl. D preceding samples) */ - const opus_int nb_subfr, /* I Number of subframes stacked in x */ - const opus_int D /* I Order */ -) -{ - opus_int k, n, s, lz, rshifts, rshifts_extra, reached_max_gain; - opus_int32 C0, num, nrg, rc_Q31, invGain_Q30, Atmp_QA, Atmp1, tmp1, tmp2, x1, x2; - const opus_int16 *x_ptr; - opus_int32 C_first_row[ SILK_MAX_ORDER_LPC ]; - opus_int32 C_last_row[ SILK_MAX_ORDER_LPC ]; - opus_int32 Af_QA[ SILK_MAX_ORDER_LPC ]; - opus_int32 CAf[ SILK_MAX_ORDER_LPC + 1 ]; - opus_int32 CAb[ SILK_MAX_ORDER_LPC + 1 ]; - - silk_assert( subfr_length * nb_subfr <= MAX_FRAME_SIZE ); - - /* Compute autocorrelations, added over subframes */ - silk_sum_sqr_shift( &C0, &rshifts, x, nb_subfr * subfr_length ); - if( rshifts > MAX_RSHIFTS ) { - C0 = silk_LSHIFT32( C0, rshifts - MAX_RSHIFTS ); - silk_assert( C0 > 0 ); - rshifts = MAX_RSHIFTS; - } else { - lz = silk_CLZ32( C0 ) - 1; - rshifts_extra = N_BITS_HEAD_ROOM - lz; - if( rshifts_extra > 0 ) { - rshifts_extra = silk_min( rshifts_extra, MAX_RSHIFTS - rshifts ); - C0 = silk_RSHIFT32( C0, rshifts_extra ); - } else { - rshifts_extra = silk_max( rshifts_extra, MIN_RSHIFTS - rshifts ); - C0 = silk_LSHIFT32( C0, -rshifts_extra ); - } - rshifts += rshifts_extra; - } - CAb[ 0 ] = CAf[ 0 ] = C0 + silk_SMMUL( SILK_FIX_CONST( FIND_LPC_COND_FAC, 32 ), C0 ) + 1; /* Q(-rshifts) */ - silk_memset( C_first_row, 0, SILK_MAX_ORDER_LPC * sizeof( opus_int32 ) ); - if( rshifts > 0 ) { - for( s = 0; s < nb_subfr; s++ ) { - x_ptr = x + s * subfr_length; - for( n = 1; n < D + 1; n++ ) { - C_first_row[ n - 1 ] += (opus_int32)silk_RSHIFT64( - silk_inner_prod16_aligned_64( x_ptr, x_ptr + n, subfr_length - n ), rshifts ); - } - } - } else { - for( s = 0; s < nb_subfr; s++ ) { - x_ptr = x + s * subfr_length; - for( n = 1; n < D + 1; n++ ) { - C_first_row[ n - 1 ] += silk_LSHIFT32( - silk_inner_prod_aligned( x_ptr, x_ptr + n, subfr_length - n ), -rshifts ); - } - } - } - silk_memcpy( C_last_row, C_first_row, SILK_MAX_ORDER_LPC * sizeof( opus_int32 ) ); - - /* Initialize */ - CAb[ 0 ] = CAf[ 0 ] = C0 + silk_SMMUL( SILK_FIX_CONST( FIND_LPC_COND_FAC, 32 ), C0 ) + 1; /* Q(-rshifts) */ - - invGain_Q30 = (opus_int32)1 << 30; - reached_max_gain = 0; - for( n = 0; n < D; n++ ) { - /* Update first row of correlation matrix (without first element) */ - /* Update last row of correlation matrix (without last element, stored in reversed order) */ - /* Update C * Af */ - /* Update C * flipud(Af) (stored in reversed order) */ - if( rshifts > -2 ) { - for( s = 0; s < nb_subfr; s++ ) { - x_ptr = x + s * subfr_length; - x1 = -silk_LSHIFT32( (opus_int32)x_ptr[ n ], 16 - rshifts ); /* Q(16-rshifts) */ - x2 = -silk_LSHIFT32( (opus_int32)x_ptr[ subfr_length - n - 1 ], 16 - rshifts ); /* Q(16-rshifts) */ - tmp1 = silk_LSHIFT32( (opus_int32)x_ptr[ n ], QA - 16 ); /* Q(QA-16) */ - tmp2 = silk_LSHIFT32( (opus_int32)x_ptr[ subfr_length - n - 1 ], QA - 16 ); /* Q(QA-16) */ - for( k = 0; k < n; k++ ) { - C_first_row[ k ] = silk_SMLAWB( C_first_row[ k ], x1, x_ptr[ n - k - 1 ] ); /* Q( -rshifts ) */ - C_last_row[ k ] = silk_SMLAWB( C_last_row[ k ], x2, x_ptr[ subfr_length - n + k ] ); /* Q( -rshifts ) */ - Atmp_QA = Af_QA[ k ]; - tmp1 = silk_SMLAWB( tmp1, Atmp_QA, x_ptr[ n - k - 1 ] ); /* Q(QA-16) */ - tmp2 = silk_SMLAWB( tmp2, Atmp_QA, x_ptr[ subfr_length - n + k ] ); /* Q(QA-16) */ - } - tmp1 = silk_LSHIFT32( -tmp1, 32 - QA - rshifts ); /* Q(16-rshifts) */ - tmp2 = silk_LSHIFT32( -tmp2, 32 - QA - rshifts ); /* Q(16-rshifts) */ - for( k = 0; k <= n; k++ ) { - CAf[ k ] = silk_SMLAWB( CAf[ k ], tmp1, x_ptr[ n - k ] ); /* Q( -rshift ) */ - CAb[ k ] = silk_SMLAWB( CAb[ k ], tmp2, x_ptr[ subfr_length - n + k - 1 ] ); /* Q( -rshift ) */ - } - } - } else { - for( s = 0; s < nb_subfr; s++ ) { - x_ptr = x + s * subfr_length; - x1 = -silk_LSHIFT32( (opus_int32)x_ptr[ n ], -rshifts ); /* Q( -rshifts ) */ - x2 = -silk_LSHIFT32( (opus_int32)x_ptr[ subfr_length - n - 1 ], -rshifts ); /* Q( -rshifts ) */ - tmp1 = silk_LSHIFT32( (opus_int32)x_ptr[ n ], 17 ); /* Q17 */ - tmp2 = silk_LSHIFT32( (opus_int32)x_ptr[ subfr_length - n - 1 ], 17 ); /* Q17 */ - for( k = 0; k < n; k++ ) { - C_first_row[ k ] = silk_MLA( C_first_row[ k ], x1, x_ptr[ n - k - 1 ] ); /* Q( -rshifts ) */ - C_last_row[ k ] = silk_MLA( C_last_row[ k ], x2, x_ptr[ subfr_length - n + k ] ); /* Q( -rshifts ) */ - Atmp1 = silk_RSHIFT_ROUND( Af_QA[ k ], QA - 17 ); /* Q17 */ - tmp1 = silk_MLA( tmp1, x_ptr[ n - k - 1 ], Atmp1 ); /* Q17 */ - tmp2 = silk_MLA( tmp2, x_ptr[ subfr_length - n + k ], Atmp1 ); /* Q17 */ - } - tmp1 = -tmp1; /* Q17 */ - tmp2 = -tmp2; /* Q17 */ - for( k = 0; k <= n; k++ ) { - CAf[ k ] = silk_SMLAWW( CAf[ k ], tmp1, - silk_LSHIFT32( (opus_int32)x_ptr[ n - k ], -rshifts - 1 ) ); /* Q( -rshift ) */ - CAb[ k ] = silk_SMLAWW( CAb[ k ], tmp2, - silk_LSHIFT32( (opus_int32)x_ptr[ subfr_length - n + k - 1 ], -rshifts - 1 ) ); /* Q( -rshift ) */ - } - } - } - - /* Calculate nominator and denominator for the next order reflection (parcor) coefficient */ - tmp1 = C_first_row[ n ]; /* Q( -rshifts ) */ - tmp2 = C_last_row[ n ]; /* Q( -rshifts ) */ - num = 0; /* Q( -rshifts ) */ - nrg = silk_ADD32( CAb[ 0 ], CAf[ 0 ] ); /* Q( 1-rshifts ) */ - for( k = 0; k < n; k++ ) { - Atmp_QA = Af_QA[ k ]; - lz = silk_CLZ32( silk_abs( Atmp_QA ) ) - 1; - lz = silk_min( 32 - QA, lz ); - Atmp1 = silk_LSHIFT32( Atmp_QA, lz ); /* Q( QA + lz ) */ - - tmp1 = silk_ADD_LSHIFT32( tmp1, silk_SMMUL( C_last_row[ n - k - 1 ], Atmp1 ), 32 - QA - lz ); /* Q( -rshifts ) */ - tmp2 = silk_ADD_LSHIFT32( tmp2, silk_SMMUL( C_first_row[ n - k - 1 ], Atmp1 ), 32 - QA - lz ); /* Q( -rshifts ) */ - num = silk_ADD_LSHIFT32( num, silk_SMMUL( CAb[ n - k ], Atmp1 ), 32 - QA - lz ); /* Q( -rshifts ) */ - nrg = silk_ADD_LSHIFT32( nrg, silk_SMMUL( silk_ADD32( CAb[ k + 1 ], CAf[ k + 1 ] ), - Atmp1 ), 32 - QA - lz ); /* Q( 1-rshifts ) */ - } - CAf[ n + 1 ] = tmp1; /* Q( -rshifts ) */ - CAb[ n + 1 ] = tmp2; /* Q( -rshifts ) */ - num = silk_ADD32( num, tmp2 ); /* Q( -rshifts ) */ - num = silk_LSHIFT32( -num, 1 ); /* Q( 1-rshifts ) */ - - /* Calculate the next order reflection (parcor) coefficient */ - if( silk_abs( num ) < nrg ) { - rc_Q31 = silk_DIV32_varQ( num, nrg, 31 ); - } else { - rc_Q31 = ( num > 0 ) ? silk_int32_MAX : silk_int32_MIN; - } - - /* Update inverse prediction gain */ - tmp1 = ( (opus_int32)1 << 30 ) - silk_SMMUL( rc_Q31, rc_Q31 ); - tmp1 = silk_LSHIFT( silk_SMMUL( invGain_Q30, tmp1 ), 2 ); - if( tmp1 <= minInvGain_Q30 ) { - /* Max prediction gain exceeded; set reflection coefficient such that max prediction gain is exactly hit */ - tmp2 = ( (opus_int32)1 << 30 ) - silk_DIV32_varQ( minInvGain_Q30, invGain_Q30, 30 ); /* Q30 */ - rc_Q31 = silk_SQRT_APPROX( tmp2 ); /* Q15 */ - /* Newton-Raphson iteration */ - rc_Q31 = silk_RSHIFT32( rc_Q31 + silk_DIV32( tmp2, rc_Q31 ), 1 ); /* Q15 */ - rc_Q31 = silk_LSHIFT32( rc_Q31, 16 ); /* Q31 */ - if( num < 0 ) { - /* Ensure adjusted reflection coefficients has the original sign */ - rc_Q31 = -rc_Q31; - } - invGain_Q30 = minInvGain_Q30; - reached_max_gain = 1; - } else { - invGain_Q30 = tmp1; - } - - /* Update the AR coefficients */ - for( k = 0; k < (n + 1) >> 1; k++ ) { - tmp1 = Af_QA[ k ]; /* QA */ - tmp2 = Af_QA[ n - k - 1 ]; /* QA */ - Af_QA[ k ] = silk_ADD_LSHIFT32( tmp1, silk_SMMUL( tmp2, rc_Q31 ), 1 ); /* QA */ - Af_QA[ n - k - 1 ] = silk_ADD_LSHIFT32( tmp2, silk_SMMUL( tmp1, rc_Q31 ), 1 ); /* QA */ - } - Af_QA[ n ] = silk_RSHIFT32( rc_Q31, 31 - QA ); /* QA */ - - if( reached_max_gain ) { - /* Reached max prediction gain; set remaining coefficients to zero and exit loop */ - for( k = n + 1; k < D; k++ ) { - Af_QA[ k ] = 0; - } - break; - } - - /* Update C * Af and C * Ab */ - for( k = 0; k <= n + 1; k++ ) { - tmp1 = CAf[ k ]; /* Q( -rshifts ) */ - tmp2 = CAb[ n - k + 1 ]; /* Q( -rshifts ) */ - CAf[ k ] = silk_ADD_LSHIFT32( tmp1, silk_SMMUL( tmp2, rc_Q31 ), 1 ); /* Q( -rshifts ) */ - CAb[ n - k + 1 ] = silk_ADD_LSHIFT32( tmp2, silk_SMMUL( tmp1, rc_Q31 ), 1 ); /* Q( -rshifts ) */ - } - } - - if( reached_max_gain ) { - for( k = 0; k < D; k++ ) { - /* Scale coefficients */ - A_Q16[ k ] = -silk_RSHIFT_ROUND( Af_QA[ k ], QA - 16 ); - } - /* Subtract energy of preceding samples from C0 */ - if( rshifts > 0 ) { - for( s = 0; s < nb_subfr; s++ ) { - x_ptr = x + s * subfr_length; - C0 -= (opus_int32)silk_RSHIFT64( silk_inner_prod16_aligned_64( x_ptr, x_ptr, D ), rshifts ); - } - } else { - for( s = 0; s < nb_subfr; s++ ) { - x_ptr = x + s * subfr_length; - C0 -= silk_LSHIFT32( silk_inner_prod_aligned( x_ptr, x_ptr, D ), -rshifts ); - } - } - /* Approximate residual energy */ - *res_nrg = silk_LSHIFT( silk_SMMUL( invGain_Q30, C0 ), 2 ); - *res_nrg_Q = -rshifts; - } else { - /* Return residual energy */ - nrg = CAf[ 0 ]; /* Q( -rshifts ) */ - tmp1 = (opus_int32)1 << 16; /* Q16 */ - for( k = 0; k < D; k++ ) { - Atmp1 = silk_RSHIFT_ROUND( Af_QA[ k ], QA - 16 ); /* Q16 */ - nrg = silk_SMLAWW( nrg, CAf[ k + 1 ], Atmp1 ); /* Q( -rshifts ) */ - tmp1 = silk_SMLAWW( tmp1, Atmp1, Atmp1 ); /* Q16 */ - A_Q16[ k ] = -Atmp1; - } - *res_nrg = silk_SMLAWW( nrg, silk_SMMUL( FIND_LPC_COND_FAC, C0 ), -tmp1 ); /* Q( -rshifts ) */ - *res_nrg_Q = -rshifts; - } -} |