• file
• revisions
• annotate
• diff
• comparison
• raw

media/libopus/silk/float/residual_energy_FLP.c@6474c204b198 (annotated)

media/libopus/silk/float/residual_energy_FLP.c

Wed, 31 Dec 2014 06:09:35 +0100

author

Michael Schloh von Bennewitz <michael@schloh.com>

date

Wed, 31 Dec 2014 06:09:35 +0100

changeset 0

6474c204b198

permissions

-rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

michael@0	1	/***********************************************************************
michael@0	2	Copyright (c) 2006-2011, Skype Limited. All rights reserved.
michael@0	3	Redistribution and use in source and binary forms, with or without
michael@0	4	modification, are permitted provided that the following conditions
michael@0	5	are met:
michael@0	6	- Redistributions of source code must retain the above copyright notice,
michael@0	7	this list of conditions and the following disclaimer.
michael@0	8	- Redistributions in binary form must reproduce the above copyright
michael@0	9	notice, this list of conditions and the following disclaimer in the
michael@0	10	documentation and/or other materials provided with the distribution.
michael@0	11	- Neither the name of Internet Society, IETF or IETF Trust, nor the
michael@0	12	names of specific contributors, may be used to endorse or promote
michael@0	13	products derived from this software without specific prior written
michael@0	14	permission.
michael@0	15	THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
michael@0	16	AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
michael@0	17	IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
michael@0	18	ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
michael@0	19	LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
michael@0	20	CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
michael@0	21	SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
michael@0	22	INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
michael@0	23	CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
michael@0	24	ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
michael@0	25	POSSIBILITY OF SUCH DAMAGE.
michael@0	26	***********************************************************************/
michael@0	27
michael@0	28	#ifdef HAVE_CONFIG_H
michael@0	29	#include "config.h"
michael@0	30	#endif
michael@0	31
michael@0	32	#include "main_FLP.h"
michael@0	33
michael@0	34	#define MAX_ITERATIONS_RESIDUAL_NRG 10
michael@0	35	#define REGULARIZATION_FACTOR 1e-8f
michael@0	36
michael@0	37	/* Residual energy: nrg = wxx - 2 * wXx * c + c' * wXX * c */
michael@0	38	silk_float silk_residual_energy_covar_FLP( /* O Weighted residual energy */
michael@0	39	const silk_float *c, /* I Filter coefficients */
michael@0	40	silk_float *wXX, /* I/O Weighted correlation matrix, reg. out */
michael@0	41	const silk_float *wXx, /* I Weighted correlation vector */
michael@0	42	const silk_float wxx, /* I Weighted correlation value */
michael@0	43	const opus_int D /* I Dimension */
michael@0	44	)
michael@0	45	{
michael@0	46	opus_int i, j, k;
michael@0	47	silk_float tmp, nrg = 0.0f, regularization;
michael@0	48
michael@0	49	/* Safety checks */
michael@0	50	silk_assert( D >= 0 );
michael@0	51
michael@0	52	regularization = REGULARIZATION_FACTOR * ( wXX[ 0 ] + wXX[ D * D - 1 ] );
michael@0	53	for( k = 0; k < MAX_ITERATIONS_RESIDUAL_NRG; k++ ) {
michael@0	54	nrg = wxx;
michael@0	55
michael@0	56	tmp = 0.0f;
michael@0	57	for( i = 0; i < D; i++ ) {
michael@0	58	tmp += wXx[ i ] * c[ i ];
michael@0	59	}
michael@0	60	nrg -= 2.0f * tmp;
michael@0	61
michael@0	62	/* compute c' * wXX * c, assuming wXX is symmetric */
michael@0	63	for( i = 0; i < D; i++ ) {
michael@0	64	tmp = 0.0f;
michael@0	65	for( j = i + 1; j < D; j++ ) {
michael@0	66	tmp += matrix_c_ptr( wXX, i, j, D ) * c[ j ];
michael@0	67	}
michael@0	68	nrg += c[ i ] * ( 2.0f * tmp + matrix_c_ptr( wXX, i, i, D ) * c[ i ] );
michael@0	69	}
michael@0	70	if( nrg > 0 ) {
michael@0	71	break;
michael@0	72	} else {
michael@0	73	/* Add white noise */
michael@0	74	for( i = 0; i < D; i++ ) {
michael@0	75	matrix_c_ptr( wXX, i, i, D ) += regularization;
michael@0	76	}
michael@0	77	/* Increase noise for next run */
michael@0	78	regularization *= 2.0f;
michael@0	79	}
michael@0	80	}
michael@0	81	if( k == MAX_ITERATIONS_RESIDUAL_NRG ) {
michael@0	82	silk_assert( nrg == 0 );
michael@0	83	nrg = 1.0f;
michael@0	84	}
michael@0	85
michael@0	86	return nrg;
michael@0	87	}
michael@0	88
michael@0	89	/* Calculates residual energies of input subframes where all subframes have LPC_order */
michael@0	90	/* of preceding samples */
michael@0	91	void silk_residual_energy_FLP(
michael@0	92	silk_float nrgs[ MAX_NB_SUBFR ], /* O Residual energy per subframe */
michael@0	93	const silk_float x[], /* I Input signal */
michael@0	94	silk_float a[ 2 ][ MAX_LPC_ORDER ], /* I AR coefs for each frame half */
michael@0	95	const silk_float gains[], /* I Quantization gains */
michael@0	96	const opus_int subfr_length, /* I Subframe length */
michael@0	97	const opus_int nb_subfr, /* I number of subframes */
michael@0	98	const opus_int LPC_order /* I LPC order */
michael@0	99	)
michael@0	100	{
michael@0	101	opus_int shift;
michael@0	102	silk_float *LPC_res_ptr, LPC_res[ ( MAX_FRAME_LENGTH + MAX_NB_SUBFR * MAX_LPC_ORDER ) / 2 ];
michael@0	103
michael@0	104	LPC_res_ptr = LPC_res + LPC_order;
michael@0	105	shift = LPC_order + subfr_length;
michael@0	106
michael@0	107	/* Filter input to create the LPC residual for each frame half, and measure subframe energies */
michael@0	108	silk_LPC_analysis_filter_FLP( LPC_res, a[ 0 ], x + 0 * shift, 2 * shift, LPC_order );
michael@0	109	nrgs[ 0 ] = ( silk_float )( gains[ 0 ] * gains[ 0 ] * silk_energy_FLP( LPC_res_ptr + 0 * shift, subfr_length ) );
michael@0	110	nrgs[ 1 ] = ( silk_float )( gains[ 1 ] * gains[ 1 ] * silk_energy_FLP( LPC_res_ptr + 1 * shift, subfr_length ) );
michael@0	111
michael@0	112	if( nb_subfr == MAX_NB_SUBFR ) {
michael@0	113	silk_LPC_analysis_filter_FLP( LPC_res, a[ 1 ], x + 2 * shift, 2 * shift, LPC_order );
michael@0	114	nrgs[ 2 ] = ( silk_float )( gains[ 2 ] * gains[ 2 ] * silk_energy_FLP( LPC_res_ptr + 0 * shift, subfr_length ) );
michael@0	115	nrgs[ 3 ] = ( silk_float )( gains[ 3 ] * gains[ 3 ] * silk_energy_FLP( LPC_res_ptr + 1 * shift, subfr_length ) );
michael@0	116	}
michael@0	117	}