cannam@154: /*********************************************************************** cannam@154: Copyright (c) 2006-2011, Skype Limited. All rights reserved. cannam@154: Redistribution and use in source and binary forms, with or without cannam@154: modification, are permitted provided that the following conditions cannam@154: are met: cannam@154: - Redistributions of source code must retain the above copyright notice, cannam@154: this list of conditions and the following disclaimer. cannam@154: - Redistributions in binary form must reproduce the above copyright cannam@154: notice, this list of conditions and the following disclaimer in the cannam@154: documentation and/or other materials provided with the distribution. cannam@154: - Neither the name of Internet Society, IETF or IETF Trust, nor the cannam@154: names of specific contributors, may be used to endorse or promote cannam@154: products derived from this software without specific prior written cannam@154: permission. cannam@154: THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" cannam@154: AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE cannam@154: IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE cannam@154: ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE cannam@154: LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR cannam@154: CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF cannam@154: SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS cannam@154: INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN cannam@154: CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) cannam@154: ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE cannam@154: POSSIBILITY OF SUCH DAMAGE. cannam@154: ***********************************************************************/ cannam@154: cannam@154: #ifdef HAVE_CONFIG_H cannam@154: #include "config.h" cannam@154: #endif cannam@154: cannam@154: #include "main_FIX.h" cannam@154: #include "tuning_parameters.h" cannam@154: cannam@154: void silk_find_LTP_FIX( cannam@154: opus_int32 XXLTP_Q17[ MAX_NB_SUBFR * LTP_ORDER * LTP_ORDER ], /* O Correlation matrix */ cannam@154: opus_int32 xXLTP_Q17[ MAX_NB_SUBFR * LTP_ORDER ], /* O Correlation vector */ cannam@154: const opus_int16 r_ptr[], /* I Residual signal after LPC */ cannam@154: const opus_int lag[ MAX_NB_SUBFR ], /* I LTP lags */ cannam@154: const opus_int subfr_length, /* I Subframe length */ cannam@154: const opus_int nb_subfr, /* I Number of subframes */ cannam@154: int arch /* I Run-time architecture */ cannam@154: ) cannam@154: { cannam@154: opus_int i, k, extra_shifts; cannam@154: opus_int xx_shifts, xX_shifts, XX_shifts; cannam@154: const opus_int16 *lag_ptr; cannam@154: opus_int32 *XXLTP_Q17_ptr, *xXLTP_Q17_ptr; cannam@154: opus_int32 xx, nrg, temp; cannam@154: cannam@154: xXLTP_Q17_ptr = xXLTP_Q17; cannam@154: XXLTP_Q17_ptr = XXLTP_Q17; cannam@154: for( k = 0; k < nb_subfr; k++ ) { cannam@154: lag_ptr = r_ptr - ( lag[ k ] + LTP_ORDER / 2 ); cannam@154: cannam@154: silk_sum_sqr_shift( &xx, &xx_shifts, r_ptr, subfr_length + LTP_ORDER ); /* xx in Q( -xx_shifts ) */ cannam@154: 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 ) */ cannam@154: extra_shifts = xx_shifts - XX_shifts; cannam@154: if( extra_shifts > 0 ) { cannam@154: /* Shift XX */ cannam@154: xX_shifts = xx_shifts; cannam@154: for( i = 0; i < LTP_ORDER * LTP_ORDER; i++ ) { cannam@154: XXLTP_Q17_ptr[ i ] = silk_RSHIFT32( XXLTP_Q17_ptr[ i ], extra_shifts ); /* Q( -xX_shifts ) */ cannam@154: } cannam@154: nrg = silk_RSHIFT32( nrg, extra_shifts ); /* Q( -xX_shifts ) */ cannam@154: } else if( extra_shifts < 0 ) { cannam@154: /* Shift xx */ cannam@154: xX_shifts = XX_shifts; cannam@154: xx = silk_RSHIFT32( xx, -extra_shifts ); /* Q( -xX_shifts ) */ cannam@154: } else { cannam@154: xX_shifts = xx_shifts; cannam@154: } cannam@154: silk_corrVector_FIX( lag_ptr, r_ptr, subfr_length, LTP_ORDER, xXLTP_Q17_ptr, xX_shifts, arch ); /* xXLTP_Q17_ptr in Q( -xX_shifts ) */ cannam@154: cannam@154: /* At this point all correlations are in Q(-xX_shifts) */ cannam@154: temp = silk_SMLAWB( 1, nrg, SILK_FIX_CONST( LTP_CORR_INV_MAX, 16 ) ); cannam@154: temp = silk_max( temp, xx ); cannam@154: TIC(div) cannam@154: #if 0 cannam@154: for( i = 0; i < LTP_ORDER * LTP_ORDER; i++ ) { cannam@154: XXLTP_Q17_ptr[ i ] = silk_DIV32_varQ( XXLTP_Q17_ptr[ i ], temp, 17 ); cannam@154: } cannam@154: for( i = 0; i < LTP_ORDER; i++ ) { cannam@154: xXLTP_Q17_ptr[ i ] = silk_DIV32_varQ( xXLTP_Q17_ptr[ i ], temp, 17 ); cannam@154: } cannam@154: #else cannam@154: for( i = 0; i < LTP_ORDER * LTP_ORDER; i++ ) { cannam@154: XXLTP_Q17_ptr[ i ] = (opus_int32)( silk_LSHIFT64( (opus_int64)XXLTP_Q17_ptr[ i ], 17 ) / temp ); cannam@154: } cannam@154: for( i = 0; i < LTP_ORDER; i++ ) { cannam@154: xXLTP_Q17_ptr[ i ] = (opus_int32)( silk_LSHIFT64( (opus_int64)xXLTP_Q17_ptr[ i ], 17 ) / temp ); cannam@154: } cannam@154: #endif cannam@154: TOC(div) cannam@154: r_ptr += subfr_length; cannam@154: XXLTP_Q17_ptr += LTP_ORDER * LTP_ORDER; cannam@154: xXLTP_Q17_ptr += LTP_ORDER; cannam@154: } cannam@154: }