michael@0: /*********************************************************************** michael@0: Copyright (c) 2006-2011, Skype Limited. All rights reserved. michael@0: Redistribution and use in source and binary forms, with or without michael@0: modification, are permitted provided that the following conditions michael@0: are met: michael@0: - Redistributions of source code must retain the above copyright notice, michael@0: this list of conditions and the following disclaimer. michael@0: - Redistributions in binary form must reproduce the above copyright michael@0: notice, this list of conditions and the following disclaimer in the michael@0: documentation and/or other materials provided with the distribution. michael@0: - Neither the name of Internet Society, IETF or IETF Trust, nor the michael@0: names of specific contributors, may be used to endorse or promote michael@0: products derived from this software without specific prior written michael@0: permission. michael@0: THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" michael@0: AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE michael@0: IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE michael@0: ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE michael@0: LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR michael@0: CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF michael@0: SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS michael@0: INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN michael@0: CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) michael@0: ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE michael@0: POSSIBILITY OF SUCH DAMAGE. michael@0: ***********************************************************************/ michael@0: michael@0: #ifdef HAVE_CONFIG_H michael@0: #include "config.h" michael@0: #endif michael@0: michael@0: #include "main_FIX.h" michael@0: #include "stack_alloc.h" michael@0: michael@0: /* Calculates residual energies of input subframes where all subframes have LPC_order */ michael@0: /* of preceding samples */ michael@0: void silk_residual_energy_FIX( michael@0: opus_int32 nrgs[ MAX_NB_SUBFR ], /* O Residual energy per subframe */ michael@0: opus_int nrgsQ[ MAX_NB_SUBFR ], /* O Q value per subframe */ michael@0: const opus_int16 x[], /* I Input signal */ michael@0: opus_int16 a_Q12[ 2 ][ MAX_LPC_ORDER ], /* I AR coefs for each frame half */ michael@0: const opus_int32 gains[ MAX_NB_SUBFR ], /* I Quantization gains */ michael@0: const opus_int subfr_length, /* I Subframe length */ michael@0: const opus_int nb_subfr, /* I Number of subframes */ michael@0: const opus_int LPC_order /* I LPC order */ michael@0: ) michael@0: { michael@0: opus_int offset, i, j, rshift, lz1, lz2; michael@0: opus_int16 *LPC_res_ptr; michael@0: VARDECL( opus_int16, LPC_res ); michael@0: const opus_int16 *x_ptr; michael@0: opus_int32 tmp32; michael@0: SAVE_STACK; michael@0: michael@0: x_ptr = x; michael@0: offset = LPC_order + subfr_length; michael@0: michael@0: /* Filter input to create the LPC residual for each frame half, and measure subframe energies */ michael@0: ALLOC( LPC_res, ( MAX_NB_SUBFR >> 1 ) * offset, opus_int16 ); michael@0: silk_assert( ( nb_subfr >> 1 ) * ( MAX_NB_SUBFR >> 1 ) == nb_subfr ); michael@0: for( i = 0; i < nb_subfr >> 1; i++ ) { michael@0: /* Calculate half frame LPC residual signal including preceding samples */ michael@0: silk_LPC_analysis_filter( LPC_res, x_ptr, a_Q12[ i ], ( MAX_NB_SUBFR >> 1 ) * offset, LPC_order ); michael@0: michael@0: /* Point to first subframe of the just calculated LPC residual signal */ michael@0: LPC_res_ptr = LPC_res + LPC_order; michael@0: for( j = 0; j < ( MAX_NB_SUBFR >> 1 ); j++ ) { michael@0: /* Measure subframe energy */ michael@0: silk_sum_sqr_shift( &nrgs[ i * ( MAX_NB_SUBFR >> 1 ) + j ], &rshift, LPC_res_ptr, subfr_length ); michael@0: michael@0: /* Set Q values for the measured energy */ michael@0: nrgsQ[ i * ( MAX_NB_SUBFR >> 1 ) + j ] = -rshift; michael@0: michael@0: /* Move to next subframe */ michael@0: LPC_res_ptr += offset; michael@0: } michael@0: /* Move to next frame half */ michael@0: x_ptr += ( MAX_NB_SUBFR >> 1 ) * offset; michael@0: } michael@0: michael@0: /* Apply the squared subframe gains */ michael@0: for( i = 0; i < nb_subfr; i++ ) { michael@0: /* Fully upscale gains and energies */ michael@0: lz1 = silk_CLZ32( nrgs[ i ] ) - 1; michael@0: lz2 = silk_CLZ32( gains[ i ] ) - 1; michael@0: michael@0: tmp32 = silk_LSHIFT32( gains[ i ], lz2 ); michael@0: michael@0: /* Find squared gains */ michael@0: tmp32 = silk_SMMUL( tmp32, tmp32 ); /* Q( 2 * lz2 - 32 )*/ michael@0: michael@0: /* Scale energies */ michael@0: nrgs[ i ] = silk_SMMUL( tmp32, silk_LSHIFT32( nrgs[ i ], lz1 ) ); /* Q( nrgsQ[ i ] + lz1 + 2 * lz2 - 32 - 32 )*/ michael@0: nrgsQ[ i ] += lz1 + 2 * lz2 - 32 - 32; michael@0: } michael@0: RESTORE_STACK; michael@0: }