| /*********************************************************************** |
| 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 "main_FIX.h" |
| #include "stack_alloc.h" |
| |
| /* Calculates residual energies of input subframes where all subframes have LPC_order */ |
| /* of preceding samples */ |
| void silk_residual_energy_FIX( |
| opus_int32 nrgs[ MAX_NB_SUBFR ], /* O Residual energy per subframe */ |
| opus_int nrgsQ[ MAX_NB_SUBFR ], /* O Q value per subframe */ |
| const opus_int16 x[], /* I Input signal */ |
| opus_int16 a_Q12[ 2 ][ MAX_LPC_ORDER ], /* I AR coefs for each frame half */ |
| const opus_int32 gains[ MAX_NB_SUBFR ], /* I Quantization gains */ |
| const opus_int subfr_length, /* I Subframe length */ |
| const opus_int nb_subfr, /* I Number of subframes */ |
| const opus_int LPC_order, /* I LPC order */ |
| int arch /* I Run-time architecture */ |
| ) |
| { |
| opus_int offset, i, j, rshift, lz1, lz2; |
| opus_int16 *LPC_res_ptr; |
| VARDECL( opus_int16, LPC_res ); |
| const opus_int16 *x_ptr; |
| opus_int32 tmp32; |
| SAVE_STACK; |
| |
| x_ptr = x; |
| offset = LPC_order + subfr_length; |
| |
| /* Filter input to create the LPC residual for each frame half, and measure subframe energies */ |
| ALLOC( LPC_res, ( MAX_NB_SUBFR >> 1 ) * offset, opus_int16 ); |
| silk_assert( ( nb_subfr >> 1 ) * ( MAX_NB_SUBFR >> 1 ) == nb_subfr ); |
| for( i = 0; i < nb_subfr >> 1; i++ ) { |
| /* Calculate half frame LPC residual signal including preceding samples */ |
| silk_LPC_analysis_filter( LPC_res, x_ptr, a_Q12[ i ], ( MAX_NB_SUBFR >> 1 ) * offset, LPC_order, arch ); |
| |
| /* Point to first subframe of the just calculated LPC residual signal */ |
| LPC_res_ptr = LPC_res + LPC_order; |
| for( j = 0; j < ( MAX_NB_SUBFR >> 1 ); j++ ) { |
| /* Measure subframe energy */ |
| silk_sum_sqr_shift( &nrgs[ i * ( MAX_NB_SUBFR >> 1 ) + j ], &rshift, LPC_res_ptr, subfr_length ); |
| |
| /* Set Q values for the measured energy */ |
| nrgsQ[ i * ( MAX_NB_SUBFR >> 1 ) + j ] = -rshift; |
| |
| /* Move to next subframe */ |
| LPC_res_ptr += offset; |
| } |
| /* Move to next frame half */ |
| x_ptr += ( MAX_NB_SUBFR >> 1 ) * offset; |
| } |
| |
| /* Apply the squared subframe gains */ |
| for( i = 0; i < nb_subfr; i++ ) { |
| /* Fully upscale gains and energies */ |
| lz1 = silk_CLZ32( nrgs[ i ] ) - 1; |
| lz2 = silk_CLZ32( gains[ i ] ) - 1; |
| |
| tmp32 = silk_LSHIFT32( gains[ i ], lz2 ); |
| |
| /* Find squared gains */ |
| tmp32 = silk_SMMUL( tmp32, tmp32 ); /* Q( 2 * lz2 - 32 )*/ |
| |
| /* Scale energies */ |
| nrgs[ i ] = silk_SMMUL( tmp32, silk_LSHIFT32( nrgs[ i ], lz1 ) ); /* Q( nrgsQ[ i ] + lz1 + 2 * lz2 - 32 - 32 )*/ |
| nrgsQ[ i ] += lz1 + 2 * lz2 - 32 - 32; |
| } |
| RESTORE_STACK; |
| } |