d9a291f641
Took the opportunity to undo the Godot changed made to the opus source. The opus module should eventually be built in its own environment to avoid polluting others with too many include dirs and defines. TODO: Fix the platform/ stuff for opus.
155 lines
6.2 KiB
C
155 lines
6.2 KiB
C
/***********************************************************************
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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 "SigProc_FIX.h"
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#define QA 24
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#define A_LIMIT SILK_FIX_CONST( 0.99975, QA )
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#define MUL32_FRAC_Q(a32, b32, Q) ((opus_int32)(silk_RSHIFT_ROUND64(silk_SMULL(a32, b32), Q)))
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/* Compute inverse of LPC prediction gain, and */
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/* test if LPC coefficients are stable (all poles within unit circle) */
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static opus_int32 LPC_inverse_pred_gain_QA( /* O Returns inverse prediction gain in energy domain, Q30 */
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opus_int32 A_QA[ 2 ][ SILK_MAX_ORDER_LPC ], /* I Prediction coefficients */
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const opus_int order /* I Prediction order */
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)
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{
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opus_int k, n, mult2Q;
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opus_int32 invGain_Q30, rc_Q31, rc_mult1_Q30, rc_mult2, tmp_QA;
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opus_int32 *Aold_QA, *Anew_QA;
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Anew_QA = A_QA[ order & 1 ];
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invGain_Q30 = (opus_int32)1 << 30;
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for( k = order - 1; k > 0; k-- ) {
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/* Check for stability */
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if( ( Anew_QA[ k ] > A_LIMIT ) || ( Anew_QA[ k ] < -A_LIMIT ) ) {
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return 0;
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}
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/* Set RC equal to negated AR coef */
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rc_Q31 = -silk_LSHIFT( Anew_QA[ k ], 31 - QA );
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/* rc_mult1_Q30 range: [ 1 : 2^30 ] */
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rc_mult1_Q30 = ( (opus_int32)1 << 30 ) - silk_SMMUL( rc_Q31, rc_Q31 );
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silk_assert( rc_mult1_Q30 > ( 1 << 15 ) ); /* reduce A_LIMIT if fails */
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silk_assert( rc_mult1_Q30 <= ( 1 << 30 ) );
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/* rc_mult2 range: [ 2^30 : silk_int32_MAX ] */
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mult2Q = 32 - silk_CLZ32( silk_abs( rc_mult1_Q30 ) );
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rc_mult2 = silk_INVERSE32_varQ( rc_mult1_Q30, mult2Q + 30 );
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/* Update inverse gain */
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/* invGain_Q30 range: [ 0 : 2^30 ] */
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invGain_Q30 = silk_LSHIFT( silk_SMMUL( invGain_Q30, rc_mult1_Q30 ), 2 );
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silk_assert( invGain_Q30 >= 0 );
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silk_assert( invGain_Q30 <= ( 1 << 30 ) );
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/* Swap pointers */
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Aold_QA = Anew_QA;
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Anew_QA = A_QA[ k & 1 ];
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/* Update AR coefficient */
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for( n = 0; n < k; n++ ) {
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tmp_QA = Aold_QA[ n ] - MUL32_FRAC_Q( Aold_QA[ k - n - 1 ], rc_Q31, 31 );
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Anew_QA[ n ] = MUL32_FRAC_Q( tmp_QA, rc_mult2 , mult2Q );
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}
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}
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/* Check for stability */
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if( ( Anew_QA[ 0 ] > A_LIMIT ) || ( Anew_QA[ 0 ] < -A_LIMIT ) ) {
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return 0;
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}
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/* Set RC equal to negated AR coef */
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rc_Q31 = -silk_LSHIFT( Anew_QA[ 0 ], 31 - QA );
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/* Range: [ 1 : 2^30 ] */
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rc_mult1_Q30 = ( (opus_int32)1 << 30 ) - silk_SMMUL( rc_Q31, rc_Q31 );
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/* Update inverse gain */
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/* Range: [ 0 : 2^30 ] */
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invGain_Q30 = silk_LSHIFT( silk_SMMUL( invGain_Q30, rc_mult1_Q30 ), 2 );
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silk_assert( invGain_Q30 >= 0 );
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silk_assert( invGain_Q30 <= 1<<30 );
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return invGain_Q30;
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}
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/* For input in Q12 domain */
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opus_int32 silk_LPC_inverse_pred_gain( /* O Returns inverse prediction gain in energy domain, Q30 */
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const opus_int16 *A_Q12, /* I Prediction coefficients, Q12 [order] */
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const opus_int order /* I Prediction order */
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)
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{
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opus_int k;
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opus_int32 Atmp_QA[ 2 ][ SILK_MAX_ORDER_LPC ];
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opus_int32 *Anew_QA;
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opus_int32 DC_resp = 0;
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Anew_QA = Atmp_QA[ order & 1 ];
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/* Increase Q domain of the AR coefficients */
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for( k = 0; k < order; k++ ) {
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DC_resp += (opus_int32)A_Q12[ k ];
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Anew_QA[ k ] = silk_LSHIFT32( (opus_int32)A_Q12[ k ], QA - 12 );
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}
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/* If the DC is unstable, we don't even need to do the full calculations */
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if( DC_resp >= 4096 ) {
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return 0;
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}
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return LPC_inverse_pred_gain_QA( Atmp_QA, order );
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}
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#ifdef FIXED_POINT
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/* For input in Q24 domain */
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opus_int32 silk_LPC_inverse_pred_gain_Q24( /* O Returns inverse prediction gain in energy domain, Q30 */
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const opus_int32 *A_Q24, /* I Prediction coefficients [order] */
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const opus_int order /* I Prediction order */
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)
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{
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opus_int k;
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opus_int32 Atmp_QA[ 2 ][ SILK_MAX_ORDER_LPC ];
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opus_int32 *Anew_QA;
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Anew_QA = Atmp_QA[ order & 1 ];
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/* Increase Q domain of the AR coefficients */
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for( k = 0; k < order; k++ ) {
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Anew_QA[ k ] = silk_RSHIFT32( A_Q24[ k ], 24 - QA );
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}
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return LPC_inverse_pred_gain_QA( Atmp_QA, order );
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}
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#endif
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