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.h" Chris@69: Chris@69: /* Limit, stabilize, convert and quantize NLSFs */ Chris@69: void silk_process_NLSFs( Chris@69: silk_encoder_state *psEncC, /* I/O Encoder state */ Chris@69: opus_int16 PredCoef_Q12[ 2 ][ MAX_LPC_ORDER ], /* O Prediction coefficients */ Chris@69: opus_int16 pNLSF_Q15[ MAX_LPC_ORDER ], /* I/O Normalized LSFs (quant out) (0 - (2^15-1)) */ Chris@69: const opus_int16 prev_NLSFq_Q15[ MAX_LPC_ORDER ] /* I Previous Normalized LSFs (0 - (2^15-1)) */ Chris@69: ) Chris@69: { Chris@69: opus_int i, doInterpolate; Chris@69: opus_int NLSF_mu_Q20; Chris@69: opus_int16 i_sqr_Q15; Chris@69: opus_int16 pNLSF0_temp_Q15[ MAX_LPC_ORDER ]; Chris@69: opus_int16 pNLSFW_QW[ MAX_LPC_ORDER ]; Chris@69: opus_int16 pNLSFW0_temp_QW[ MAX_LPC_ORDER ]; Chris@69: Chris@69: silk_assert( psEncC->speech_activity_Q8 >= 0 ); Chris@69: silk_assert( psEncC->speech_activity_Q8 <= SILK_FIX_CONST( 1.0, 8 ) ); Chris@69: celt_assert( psEncC->useInterpolatedNLSFs == 1 || psEncC->indices.NLSFInterpCoef_Q2 == ( 1 << 2 ) ); Chris@69: Chris@69: /***********************/ Chris@69: /* Calculate mu values */ Chris@69: /***********************/ Chris@69: /* NLSF_mu = 0.003 - 0.0015 * psEnc->speech_activity; */ Chris@69: NLSF_mu_Q20 = silk_SMLAWB( SILK_FIX_CONST( 0.003, 20 ), SILK_FIX_CONST( -0.001, 28 ), psEncC->speech_activity_Q8 ); Chris@69: if( psEncC->nb_subfr == 2 ) { Chris@69: /* Multiply by 1.5 for 10 ms packets */ Chris@69: NLSF_mu_Q20 = silk_ADD_RSHIFT( NLSF_mu_Q20, NLSF_mu_Q20, 1 ); Chris@69: } Chris@69: Chris@69: celt_assert( NLSF_mu_Q20 > 0 ); Chris@69: silk_assert( NLSF_mu_Q20 <= SILK_FIX_CONST( 0.005, 20 ) ); Chris@69: Chris@69: /* Calculate NLSF weights */ Chris@69: silk_NLSF_VQ_weights_laroia( pNLSFW_QW, pNLSF_Q15, psEncC->predictLPCOrder ); Chris@69: Chris@69: /* Update NLSF weights for interpolated NLSFs */ Chris@69: doInterpolate = ( psEncC->useInterpolatedNLSFs == 1 ) && ( psEncC->indices.NLSFInterpCoef_Q2 < 4 ); Chris@69: if( doInterpolate ) { Chris@69: /* Calculate the interpolated NLSF vector for the first half */ Chris@69: silk_interpolate( pNLSF0_temp_Q15, prev_NLSFq_Q15, pNLSF_Q15, Chris@69: psEncC->indices.NLSFInterpCoef_Q2, psEncC->predictLPCOrder ); Chris@69: Chris@69: /* Calculate first half NLSF weights for the interpolated NLSFs */ Chris@69: silk_NLSF_VQ_weights_laroia( pNLSFW0_temp_QW, pNLSF0_temp_Q15, psEncC->predictLPCOrder ); Chris@69: Chris@69: /* Update NLSF weights with contribution from first half */ Chris@69: i_sqr_Q15 = silk_LSHIFT( silk_SMULBB( psEncC->indices.NLSFInterpCoef_Q2, psEncC->indices.NLSFInterpCoef_Q2 ), 11 ); Chris@69: for( i = 0; i < psEncC->predictLPCOrder; i++ ) { Chris@69: pNLSFW_QW[ i ] = silk_ADD16( silk_RSHIFT( pNLSFW_QW[ i ], 1 ), silk_RSHIFT( Chris@69: silk_SMULBB( pNLSFW0_temp_QW[ i ], i_sqr_Q15 ), 16) ); Chris@69: silk_assert( pNLSFW_QW[ i ] >= 1 ); Chris@69: } Chris@69: } Chris@69: Chris@69: silk_NLSF_encode( psEncC->indices.NLSFIndices, pNLSF_Q15, psEncC->psNLSF_CB, pNLSFW_QW, Chris@69: NLSF_mu_Q20, psEncC->NLSF_MSVQ_Survivors, psEncC->indices.signalType ); Chris@69: Chris@69: /* Convert quantized NLSFs back to LPC coefficients */ Chris@69: silk_NLSF2A( PredCoef_Q12[ 1 ], pNLSF_Q15, psEncC->predictLPCOrder, psEncC->arch ); Chris@69: Chris@69: if( doInterpolate ) { Chris@69: /* Calculate the interpolated, quantized LSF vector for the first half */ Chris@69: silk_interpolate( pNLSF0_temp_Q15, prev_NLSFq_Q15, pNLSF_Q15, Chris@69: psEncC->indices.NLSFInterpCoef_Q2, psEncC->predictLPCOrder ); Chris@69: Chris@69: /* Convert back to LPC coefficients */ Chris@69: silk_NLSF2A( PredCoef_Q12[ 0 ], pNLSF0_temp_Q15, psEncC->predictLPCOrder, psEncC->arch ); Chris@69: Chris@69: } else { Chris@69: /* Copy LPC coefficients for first half from second half */ Chris@69: celt_assert( psEncC->predictLPCOrder <= MAX_LPC_ORDER ); Chris@69: silk_memcpy( PredCoef_Q12[ 0 ], PredCoef_Q12[ 1 ], psEncC->predictLPCOrder * sizeof( opus_int16 ) ); Chris@69: } Chris@69: }