1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/media/libopus/silk/process_NLSFs.c Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,105 @@
1.4 +/***********************************************************************
1.5 +Copyright (c) 2006-2011, Skype Limited. All rights reserved.
1.6 +Redistribution and use in source and binary forms, with or without
1.7 +modification, are permitted provided that the following conditions
1.8 +are met:
1.9 +- Redistributions of source code must retain the above copyright notice,
1.10 +this list of conditions and the following disclaimer.
1.11 +- Redistributions in binary form must reproduce the above copyright
1.12 +notice, this list of conditions and the following disclaimer in the
1.13 +documentation and/or other materials provided with the distribution.
1.14 +- Neither the name of Internet Society, IETF or IETF Trust, nor the
1.15 +names of specific contributors, may be used to endorse or promote
1.16 +products derived from this software without specific prior written
1.17 +permission.
1.18 +THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
1.19 +AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
1.20 +IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
1.21 +ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
1.22 +LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
1.23 +CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
1.24 +SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
1.25 +INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
1.26 +CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
1.27 +ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
1.28 +POSSIBILITY OF SUCH DAMAGE.
1.29 +***********************************************************************/
1.30 +
1.31 +#ifdef HAVE_CONFIG_H
1.32 +#include "config.h"
1.33 +#endif
1.34 +
1.35 +#include "main.h"
1.36 +
1.37 +/* Limit, stabilize, convert and quantize NLSFs */
1.38 +void silk_process_NLSFs(
1.39 + silk_encoder_state *psEncC, /* I/O Encoder state */
1.40 + opus_int16 PredCoef_Q12[ 2 ][ MAX_LPC_ORDER ], /* O Prediction coefficients */
1.41 + opus_int16 pNLSF_Q15[ MAX_LPC_ORDER ], /* I/O Normalized LSFs (quant out) (0 - (2^15-1)) */
1.42 + const opus_int16 prev_NLSFq_Q15[ MAX_LPC_ORDER ] /* I Previous Normalized LSFs (0 - (2^15-1)) */
1.43 +)
1.44 +{
1.45 + opus_int i, doInterpolate;
1.46 + opus_int NLSF_mu_Q20;
1.47 + opus_int32 i_sqr_Q15;
1.48 + opus_int16 pNLSF0_temp_Q15[ MAX_LPC_ORDER ];
1.49 + opus_int16 pNLSFW_QW[ MAX_LPC_ORDER ];
1.50 + opus_int16 pNLSFW0_temp_QW[ MAX_LPC_ORDER ];
1.51 +
1.52 + silk_assert( psEncC->speech_activity_Q8 >= 0 );
1.53 + silk_assert( psEncC->speech_activity_Q8 <= SILK_FIX_CONST( 1.0, 8 ) );
1.54 + silk_assert( psEncC->useInterpolatedNLSFs == 1 || psEncC->indices.NLSFInterpCoef_Q2 == ( 1 << 2 ) );
1.55 +
1.56 + /***********************/
1.57 + /* Calculate mu values */
1.58 + /***********************/
1.59 + /* NLSF_mu = 0.003 - 0.0015 * psEnc->speech_activity; */
1.60 + NLSF_mu_Q20 = silk_SMLAWB( SILK_FIX_CONST( 0.003, 20 ), SILK_FIX_CONST( -0.001, 28 ), psEncC->speech_activity_Q8 );
1.61 + if( psEncC->nb_subfr == 2 ) {
1.62 + /* Multiply by 1.5 for 10 ms packets */
1.63 + NLSF_mu_Q20 = silk_ADD_RSHIFT( NLSF_mu_Q20, NLSF_mu_Q20, 1 );
1.64 + }
1.65 +
1.66 + silk_assert( NLSF_mu_Q20 > 0 );
1.67 + silk_assert( NLSF_mu_Q20 <= SILK_FIX_CONST( 0.005, 20 ) );
1.68 +
1.69 + /* Calculate NLSF weights */
1.70 + silk_NLSF_VQ_weights_laroia( pNLSFW_QW, pNLSF_Q15, psEncC->predictLPCOrder );
1.71 +
1.72 + /* Update NLSF weights for interpolated NLSFs */
1.73 + doInterpolate = ( psEncC->useInterpolatedNLSFs == 1 ) && ( psEncC->indices.NLSFInterpCoef_Q2 < 4 );
1.74 + if( doInterpolate ) {
1.75 + /* Calculate the interpolated NLSF vector for the first half */
1.76 + silk_interpolate( pNLSF0_temp_Q15, prev_NLSFq_Q15, pNLSF_Q15,
1.77 + psEncC->indices.NLSFInterpCoef_Q2, psEncC->predictLPCOrder );
1.78 +
1.79 + /* Calculate first half NLSF weights for the interpolated NLSFs */
1.80 + silk_NLSF_VQ_weights_laroia( pNLSFW0_temp_QW, pNLSF0_temp_Q15, psEncC->predictLPCOrder );
1.81 +
1.82 + /* Update NLSF weights with contribution from first half */
1.83 + i_sqr_Q15 = silk_LSHIFT( silk_SMULBB( psEncC->indices.NLSFInterpCoef_Q2, psEncC->indices.NLSFInterpCoef_Q2 ), 11 );
1.84 + for( i = 0; i < psEncC->predictLPCOrder; i++ ) {
1.85 + pNLSFW_QW[ i ] = silk_SMLAWB( silk_RSHIFT( pNLSFW_QW[ i ], 1 ), (opus_int32)pNLSFW0_temp_QW[ i ], i_sqr_Q15 );
1.86 + silk_assert( pNLSFW_QW[ i ] >= 1 );
1.87 + }
1.88 + }
1.89 +
1.90 + silk_NLSF_encode( psEncC->indices.NLSFIndices, pNLSF_Q15, psEncC->psNLSF_CB, pNLSFW_QW,
1.91 + NLSF_mu_Q20, psEncC->NLSF_MSVQ_Survivors, psEncC->indices.signalType );
1.92 +
1.93 + /* Convert quantized NLSFs back to LPC coefficients */
1.94 + silk_NLSF2A( PredCoef_Q12[ 1 ], pNLSF_Q15, psEncC->predictLPCOrder );
1.95 +
1.96 + if( doInterpolate ) {
1.97 + /* Calculate the interpolated, quantized LSF vector for the first half */
1.98 + silk_interpolate( pNLSF0_temp_Q15, prev_NLSFq_Q15, pNLSF_Q15,
1.99 + psEncC->indices.NLSFInterpCoef_Q2, psEncC->predictLPCOrder );
1.100 +
1.101 + /* Convert back to LPC coefficients */
1.102 + silk_NLSF2A( PredCoef_Q12[ 0 ], pNLSF0_temp_Q15, psEncC->predictLPCOrder );
1.103 +
1.104 + } else {
1.105 + /* Copy LPC coefficients for first half from second half */
1.106 + silk_memcpy( PredCoef_Q12[ 0 ], PredCoef_Q12[ 1 ], psEncC->predictLPCOrder * sizeof( opus_int16 ) );
1.107 + }
1.108 +}
