Chris@69: /*********************************************************************** Chris@69: Copyright (c) 2006-2011, Skype Limited. All rights reserved. Chris@69: Redistribution and use in source and binary forms, with or without Chris@69: modification, are permitted provided that the following conditions Chris@69: are met: Chris@69: - Redistributions of source code must retain the above copyright notice, Chris@69: this list of conditions and the following disclaimer. Chris@69: - Redistributions in binary form must reproduce the above copyright Chris@69: notice, this list of conditions and the following disclaimer in the Chris@69: documentation and/or other materials provided with the distribution. Chris@69: - Neither the name of Internet Society, IETF or IETF Trust, nor the Chris@69: names of specific contributors, may be used to endorse or promote Chris@69: products derived from this software without specific prior written Chris@69: permission. Chris@69: THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" Chris@69: AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE Chris@69: IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE Chris@69: ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE Chris@69: LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR Chris@69: CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF Chris@69: SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS Chris@69: INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN Chris@69: CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) Chris@69: ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE Chris@69: POSSIBILITY OF SUCH DAMAGE. Chris@69: ***********************************************************************/ Chris@69: Chris@69: #ifdef HAVE_CONFIG_H Chris@69: #include "config.h" Chris@69: #endif Chris@69: Chris@69: #include "main_FIX.h" Chris@69: #include "tuning_parameters.h" Chris@69: Chris@69: void silk_find_LTP_FIX( Chris@69: opus_int32 XXLTP_Q17[ MAX_NB_SUBFR * LTP_ORDER * LTP_ORDER ], /* O Correlation matrix */ Chris@69: opus_int32 xXLTP_Q17[ MAX_NB_SUBFR * LTP_ORDER ], /* O Correlation vector */ Chris@69: const opus_int16 r_ptr[], /* I Residual signal after LPC */ Chris@69: const opus_int lag[ MAX_NB_SUBFR ], /* I LTP lags */ Chris@69: const opus_int subfr_length, /* I Subframe length */ Chris@69: const opus_int nb_subfr, /* I Number of subframes */ Chris@69: int arch /* I Run-time architecture */ Chris@69: ) Chris@69: { Chris@69: opus_int i, k, extra_shifts; Chris@69: opus_int xx_shifts, xX_shifts, XX_shifts; Chris@69: const opus_int16 *lag_ptr; Chris@69: opus_int32 *XXLTP_Q17_ptr, *xXLTP_Q17_ptr; Chris@69: opus_int32 xx, nrg, temp; Chris@69: Chris@69: xXLTP_Q17_ptr = xXLTP_Q17; Chris@69: XXLTP_Q17_ptr = XXLTP_Q17; Chris@69: for( k = 0; k < nb_subfr; k++ ) { Chris@69: lag_ptr = r_ptr - ( lag[ k ] + LTP_ORDER / 2 ); Chris@69: Chris@69: silk_sum_sqr_shift( &xx, &xx_shifts, r_ptr, subfr_length + LTP_ORDER ); /* xx in Q( -xx_shifts ) */ Chris@69: silk_corrMatrix_FIX( lag_ptr, subfr_length, LTP_ORDER, XXLTP_Q17_ptr, &nrg, &XX_shifts, arch ); /* XXLTP_Q17_ptr and nrg in Q( -XX_shifts ) */ Chris@69: extra_shifts = xx_shifts - XX_shifts; Chris@69: if( extra_shifts > 0 ) { Chris@69: /* Shift XX */ Chris@69: xX_shifts = xx_shifts; Chris@69: for( i = 0; i < LTP_ORDER * LTP_ORDER; i++ ) { Chris@69: XXLTP_Q17_ptr[ i ] = silk_RSHIFT32( XXLTP_Q17_ptr[ i ], extra_shifts ); /* Q( -xX_shifts ) */ Chris@69: } Chris@69: nrg = silk_RSHIFT32( nrg, extra_shifts ); /* Q( -xX_shifts ) */ Chris@69: } else if( extra_shifts < 0 ) { Chris@69: /* Shift xx */ Chris@69: xX_shifts = XX_shifts; Chris@69: xx = silk_RSHIFT32( xx, -extra_shifts ); /* Q( -xX_shifts ) */ Chris@69: } else { Chris@69: xX_shifts = xx_shifts; Chris@69: } Chris@69: silk_corrVector_FIX( lag_ptr, r_ptr, subfr_length, LTP_ORDER, xXLTP_Q17_ptr, xX_shifts, arch ); /* xXLTP_Q17_ptr in Q( -xX_shifts ) */ Chris@69: Chris@69: /* At this point all correlations are in Q(-xX_shifts) */ Chris@69: temp = silk_SMLAWB( 1, nrg, SILK_FIX_CONST( LTP_CORR_INV_MAX, 16 ) ); Chris@69: temp = silk_max( temp, xx ); Chris@69: TIC(div) Chris@69: #if 0 Chris@69: for( i = 0; i < LTP_ORDER * LTP_ORDER; i++ ) { Chris@69: XXLTP_Q17_ptr[ i ] = silk_DIV32_varQ( XXLTP_Q17_ptr[ i ], temp, 17 ); Chris@69: } Chris@69: for( i = 0; i < LTP_ORDER; i++ ) { Chris@69: xXLTP_Q17_ptr[ i ] = silk_DIV32_varQ( xXLTP_Q17_ptr[ i ], temp, 17 ); Chris@69: } Chris@69: #else Chris@69: for( i = 0; i < LTP_ORDER * LTP_ORDER; i++ ) { Chris@69: XXLTP_Q17_ptr[ i ] = (opus_int32)( silk_LSHIFT64( (opus_int64)XXLTP_Q17_ptr[ i ], 17 ) / temp ); Chris@69: } Chris@69: for( i = 0; i < LTP_ORDER; i++ ) { Chris@69: xXLTP_Q17_ptr[ i ] = (opus_int32)( silk_LSHIFT64( (opus_int64)xXLTP_Q17_ptr[ i ], 17 ) / temp ); Chris@69: } Chris@69: #endif Chris@69: TOC(div) Chris@69: r_ptr += subfr_length; Chris@69: XXLTP_Q17_ptr += LTP_ORDER * LTP_ORDER; Chris@69: xXLTP_Q17_ptr += LTP_ORDER; Chris@69: } Chris@69: }