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media/libopus/silk/fixed/residual_energy_FIX.c@b8a032363ba2 (annotated)

media/libopus/silk/fixed/residual_energy_FIX.c

Thu, 22 Jan 2015 13:21:57 +0100

author

Michael Schloh von Bennewitz <michael@schloh.com>

date

Thu, 22 Jan 2015 13:21:57 +0100

branch

TOR_BUG_9701

changeset 15

b8a032363ba2

permissions

-rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

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_FIX.h"
michael@0	33	#include "stack_alloc.h"
michael@0	34
michael@0	35	/* Calculates residual energies of input subframes where all subframes have LPC_order */
michael@0	36	/* of preceding samples */
michael@0	37	void silk_residual_energy_FIX(
michael@0	38	opus_int32 nrgs[ MAX_NB_SUBFR ], /* O Residual energy per subframe */
michael@0	39	opus_int nrgsQ[ MAX_NB_SUBFR ], /* O Q value per subframe */
michael@0	40	const opus_int16 x[], /* I Input signal */
michael@0	41	opus_int16 a_Q12[ 2 ][ MAX_LPC_ORDER ], /* I AR coefs for each frame half */
michael@0	42	const opus_int32 gains[ MAX_NB_SUBFR ], /* I Quantization gains */
michael@0	43	const opus_int subfr_length, /* I Subframe length */
michael@0	44	const opus_int nb_subfr, /* I Number of subframes */
michael@0	45	const opus_int LPC_order /* I LPC order */
michael@0	46	)
michael@0	47	{
michael@0	48	opus_int offset, i, j, rshift, lz1, lz2;
michael@0	49	opus_int16 *LPC_res_ptr;
michael@0	50	VARDECL( opus_int16, LPC_res );
michael@0	51	const opus_int16 *x_ptr;
michael@0	52	opus_int32 tmp32;
michael@0	53	SAVE_STACK;
michael@0	54
michael@0	55	x_ptr = x;
michael@0	56	offset = LPC_order + subfr_length;
michael@0	57
michael@0	58	/* Filter input to create the LPC residual for each frame half, and measure subframe energies */
michael@0	59	ALLOC( LPC_res, ( MAX_NB_SUBFR >> 1 ) * offset, opus_int16 );
michael@0	60	silk_assert( ( nb_subfr >> 1 ) * ( MAX_NB_SUBFR >> 1 ) == nb_subfr );
michael@0	61	for( i = 0; i < nb_subfr >> 1; i++ ) {
michael@0	62	/* Calculate half frame LPC residual signal including preceding samples */
michael@0	63	silk_LPC_analysis_filter( LPC_res, x_ptr, a_Q12[ i ], ( MAX_NB_SUBFR >> 1 ) * offset, LPC_order );
michael@0	64
michael@0	65	/* Point to first subframe of the just calculated LPC residual signal */
michael@0	66	LPC_res_ptr = LPC_res + LPC_order;
michael@0	67	for( j = 0; j < ( MAX_NB_SUBFR >> 1 ); j++ ) {
michael@0	68	/* Measure subframe energy */
michael@0	69	silk_sum_sqr_shift( &nrgs[ i * ( MAX_NB_SUBFR >> 1 ) + j ], &rshift, LPC_res_ptr, subfr_length );
michael@0	70
michael@0	71	/* Set Q values for the measured energy */
michael@0	72	nrgsQ[ i * ( MAX_NB_SUBFR >> 1 ) + j ] = -rshift;
michael@0	73
michael@0	74	/* Move to next subframe */
michael@0	75	LPC_res_ptr += offset;
michael@0	76	}
michael@0	77	/* Move to next frame half */
michael@0	78	x_ptr += ( MAX_NB_SUBFR >> 1 ) * offset;
michael@0	79	}
michael@0	80
michael@0	81	/* Apply the squared subframe gains */
michael@0	82	for( i = 0; i < nb_subfr; i++ ) {
michael@0	83	/* Fully upscale gains and energies */
michael@0	84	lz1 = silk_CLZ32( nrgs[ i ] ) - 1;
michael@0	85	lz2 = silk_CLZ32( gains[ i ] ) - 1;
michael@0	86
michael@0	87	tmp32 = silk_LSHIFT32( gains[ i ], lz2 );
michael@0	88
michael@0	89	/* Find squared gains */
michael@0	90	tmp32 = silk_SMMUL( tmp32, tmp32 ); /* Q( 2 * lz2 - 32 )*/
michael@0	91
michael@0	92	/* Scale energies */
michael@0	93	nrgs[ i ] = silk_SMMUL( tmp32, silk_LSHIFT32( nrgs[ i ], lz1 ) ); /* Q( nrgsQ[ i ] + lz1 + 2 * lz2 - 32 - 32 )*/
michael@0	94	nrgsQ[ i ] += lz1 + 2 * lz2 - 32 - 32;
michael@0	95	}
michael@0	96	RESTORE_STACK;
michael@0	97	}