138 lines
6.9 KiB
C
138 lines
6.9 KiB
C
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/***********************************************************************
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Copyright (c) 2006-2011, Skype Limited. All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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- Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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- Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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- Neither the name of Internet Society, IETF or IETF Trust, nor the
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names of specific contributors, may be used to endorse or promote
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products derived from this software without specific prior written
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permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS “AS IS”
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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***********************************************************************/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "main_FIX.h"
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#include "tuning_parameters.h"
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/* Find pitch lags */
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void silk_find_pitch_lags_FIX(
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silk_encoder_state_FIX *psEnc, /* I/O encoder state */
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silk_encoder_control_FIX *psEncCtrl, /* I/O encoder control */
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opus_int16 res[], /* O residual */
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const opus_int16 x[] /* I Speech signal */
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)
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{
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opus_int buf_len, i, scale;
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opus_int32 thrhld_Q15, res_nrg;
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const opus_int16 *x_buf, *x_buf_ptr;
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opus_int16 Wsig[ FIND_PITCH_LPC_WIN_MAX ], *Wsig_ptr;
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opus_int32 auto_corr[ MAX_FIND_PITCH_LPC_ORDER + 1 ];
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opus_int16 rc_Q15[ MAX_FIND_PITCH_LPC_ORDER ];
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opus_int32 A_Q24[ MAX_FIND_PITCH_LPC_ORDER ];
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opus_int16 A_Q12[ MAX_FIND_PITCH_LPC_ORDER ];
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/******************************************/
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/* Set up buffer lengths etc based on Fs */
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/******************************************/
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buf_len = psEnc->sCmn.la_pitch + psEnc->sCmn.frame_length + psEnc->sCmn.ltp_mem_length;
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/* Safety check */
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silk_assert( buf_len >= psEnc->sCmn.pitch_LPC_win_length );
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x_buf = x - psEnc->sCmn.ltp_mem_length;
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/*************************************/
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/* Estimate LPC AR coefficients */
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/*************************************/
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/* Calculate windowed signal */
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/* First LA_LTP samples */
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x_buf_ptr = x_buf + buf_len - psEnc->sCmn.pitch_LPC_win_length;
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Wsig_ptr = Wsig;
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silk_apply_sine_window( Wsig_ptr, x_buf_ptr, 1, psEnc->sCmn.la_pitch );
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/* Middle un - windowed samples */
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Wsig_ptr += psEnc->sCmn.la_pitch;
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x_buf_ptr += psEnc->sCmn.la_pitch;
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silk_memcpy( Wsig_ptr, x_buf_ptr, ( psEnc->sCmn.pitch_LPC_win_length - silk_LSHIFT( psEnc->sCmn.la_pitch, 1 ) ) * sizeof( opus_int16 ) );
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/* Last LA_LTP samples */
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Wsig_ptr += psEnc->sCmn.pitch_LPC_win_length - silk_LSHIFT( psEnc->sCmn.la_pitch, 1 );
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x_buf_ptr += psEnc->sCmn.pitch_LPC_win_length - silk_LSHIFT( psEnc->sCmn.la_pitch, 1 );
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silk_apply_sine_window( Wsig_ptr, x_buf_ptr, 2, psEnc->sCmn.la_pitch );
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/* Calculate autocorrelation sequence */
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silk_autocorr( auto_corr, &scale, Wsig, psEnc->sCmn.pitch_LPC_win_length, psEnc->sCmn.pitchEstimationLPCOrder + 1 );
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/* Add white noise, as fraction of energy */
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auto_corr[ 0 ] = silk_SMLAWB( auto_corr[ 0 ], auto_corr[ 0 ], SILK_FIX_CONST( FIND_PITCH_WHITE_NOISE_FRACTION, 16 ) ) + 1;
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/* Calculate the reflection coefficients using schur */
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res_nrg = silk_schur( rc_Q15, auto_corr, psEnc->sCmn.pitchEstimationLPCOrder );
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/* Prediction gain */
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psEncCtrl->predGain_Q16 = silk_DIV32_varQ( auto_corr[ 0 ], silk_max_int( res_nrg, 1 ), 16 );
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/* Convert reflection coefficients to prediction coefficients */
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silk_k2a( A_Q24, rc_Q15, psEnc->sCmn.pitchEstimationLPCOrder );
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/* Convert From 32 bit Q24 to 16 bit Q12 coefs */
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for( i = 0; i < psEnc->sCmn.pitchEstimationLPCOrder; i++ ) {
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A_Q12[ i ] = (opus_int16)silk_SAT16( silk_RSHIFT( A_Q24[ i ], 12 ) );
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}
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/* Do BWE */
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silk_bwexpander( A_Q12, psEnc->sCmn.pitchEstimationLPCOrder, SILK_FIX_CONST( FIND_PITCH_BANDWIDTH_EXPANSION, 16 ) );
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/*****************************************/
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/* LPC analysis filtering */
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/*****************************************/
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silk_LPC_analysis_filter( res, x_buf, A_Q12, buf_len, psEnc->sCmn.pitchEstimationLPCOrder );
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if( psEnc->sCmn.indices.signalType != TYPE_NO_VOICE_ACTIVITY && psEnc->sCmn.first_frame_after_reset == 0 ) {
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/* Threshold for pitch estimator */
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thrhld_Q15 = SILK_FIX_CONST( 0.6, 15 );
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thrhld_Q15 = silk_SMLABB( thrhld_Q15, SILK_FIX_CONST( -0.004, 15 ), psEnc->sCmn.pitchEstimationLPCOrder );
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thrhld_Q15 = silk_SMLABB( thrhld_Q15, SILK_FIX_CONST( -0.1, 7 ), psEnc->sCmn.speech_activity_Q8 );
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thrhld_Q15 = silk_SMLABB( thrhld_Q15, SILK_FIX_CONST( -0.15, 15 ), silk_RSHIFT( psEnc->sCmn.prevSignalType, 1 ) );
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thrhld_Q15 = silk_SMLAWB( thrhld_Q15, SILK_FIX_CONST( -0.1, 16 ), psEnc->sCmn.input_tilt_Q15 );
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thrhld_Q15 = silk_SAT16( thrhld_Q15 );
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/*****************************************/
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/* Call pitch estimator */
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/*****************************************/
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if( silk_pitch_analysis_core( res, psEncCtrl->pitchL, &psEnc->sCmn.indices.lagIndex, &psEnc->sCmn.indices.contourIndex,
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&psEnc->LTPCorr_Q15, psEnc->sCmn.prevLag, psEnc->sCmn.pitchEstimationThreshold_Q16,
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(opus_int16)thrhld_Q15, psEnc->sCmn.fs_kHz, psEnc->sCmn.pitchEstimationComplexity, psEnc->sCmn.nb_subfr ) == 0 )
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{
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psEnc->sCmn.indices.signalType = TYPE_VOICED;
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} else {
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psEnc->sCmn.indices.signalType = TYPE_UNVOICED;
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}
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} else {
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silk_memset( psEncCtrl->pitchL, 0, sizeof( psEncCtrl->pitchL ) );
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psEnc->sCmn.indices.lagIndex = 0;
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psEnc->sCmn.indices.contourIndex = 0;
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psEnc->LTPCorr_Q15 = 0;
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}
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}
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