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_FIX.h" 33 #include "stack_alloc.h" 34 35 /* Calculates residual energies of input subframes where all subframes have LPC_order */ 36 /* of preceding samples */ 37 void silk_residual_energy_FIX( 38 opus_int32 nrgs[ MAX_NB_SUBFR ], /* O Residual energy per subframe */ 39 opus_int nrgsQ[ MAX_NB_SUBFR ], /* O Q value per subframe */ 40 const opus_int16 x[], /* I Input signal */ 41 opus_int16 a_Q12[ 2 ][ MAX_LPC_ORDER ], /* I AR coefs for each frame half */ 42 const opus_int32 gains[ MAX_NB_SUBFR ], /* I Quantization gains */ 43 const opus_int subfr_length, /* I Subframe length */ 44 const opus_int nb_subfr, /* I Number of subframes */ 45 const opus_int LPC_order, /* I LPC order */ 46 int arch /* I Run-time architecture */ 47 ) 48 { 49 opus_int offset, i, j, rshift, lz1, lz2; 50 opus_int16 *LPC_res_ptr; 51 VARDECL( opus_int16, LPC_res ); 52 const opus_int16 *x_ptr; 53 opus_int32 tmp32; 54 SAVE_STACK; 55 56 x_ptr = x; 57 offset = LPC_order + subfr_length; 58 59 /* Filter input to create the LPC residual for each frame half, and measure subframe energies */ 60 ALLOC( LPC_res, ( MAX_NB_SUBFR >> 1 ) * offset, opus_int16 ); 61 silk_assert( ( nb_subfr >> 1 ) * ( MAX_NB_SUBFR >> 1 ) == nb_subfr ); 62 for( i = 0; i < nb_subfr >> 1; i++ ) { 63 /* Calculate half frame LPC residual signal including preceding samples */ 64 silk_LPC_analysis_filter( LPC_res, x_ptr, a_Q12[ i ], ( MAX_NB_SUBFR >> 1 ) * offset, LPC_order, arch ); 65 66 /* Point to first subframe of the just calculated LPC residual signal */ 67 LPC_res_ptr = LPC_res + LPC_order; 68 for( j = 0; j < ( MAX_NB_SUBFR >> 1 ); j++ ) { 69 /* Measure subframe energy */ 70 silk_sum_sqr_shift( &nrgs[ i * ( MAX_NB_SUBFR >> 1 ) + j ], &rshift, LPC_res_ptr, subfr_length ); 71 72 /* Set Q values for the measured energy */ 73 nrgsQ[ i * ( MAX_NB_SUBFR >> 1 ) + j ] = -rshift; 74 75 /* Move to next subframe */ 76 LPC_res_ptr += offset; 77 } 78 /* Move to next frame half */ 79 x_ptr += ( MAX_NB_SUBFR >> 1 ) * offset; 80 } 81 82 /* Apply the squared subframe gains */ 83 for( i = 0; i < nb_subfr; i++ ) { 84 /* Fully upscale gains and energies */ 85 lz1 = silk_CLZ32( nrgs[ i ] ) - 1; 86 lz2 = silk_CLZ32( gains[ i ] ) - 1; 87 88 tmp32 = silk_LSHIFT32( gains[ i ], lz2 ); 89 90 /* Find squared gains */ 91 tmp32 = silk_SMMUL( tmp32, tmp32 ); /* Q( 2 * lz2 - 32 )*/ 92 93 /* Scale energies */ 94 nrgs[ i ] = silk_SMMUL( tmp32, silk_LSHIFT32( nrgs[ i ], lz1 ) ); /* Q( nrgsQ[ i ] + lz1 + 2 * lz2 - 32 - 32 )*/ 95 nrgsQ[ i ] += lz1 + 2 * lz2 - 32 - 32; 96 } 97 RESTORE_STACK; 98 } 99
