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comparison: media/libopus/silk/process_NLSFs.c
media/libopus/silk/process_NLSFs.c
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| 1 /*********************************************************************** | |
| 2 Copyright (c) 2006-2011, Skype Limited. All rights reserved. | |
| 3 Redistribution and use in source and binary forms, with or without | |
| 4 modification, are permitted provided that the following conditions | |
| 5 are met: | |
| 6 - Redistributions of source code must retain the above copyright notice, | |
| 7 this list of conditions and the following disclaimer. | |
| 8 - Redistributions in binary form must reproduce the above copyright | |
| 9 notice, this list of conditions and the following disclaimer in the | |
| 10 documentation and/or other materials provided with the distribution. | |
| 11 - Neither the name of Internet Society, IETF or IETF Trust, nor the | |
| 12 names of specific contributors, may be used to endorse or promote | |
| 13 products derived from this software without specific prior written | |
| 14 permission. | |
| 15 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | |
| 16 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 17 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
| 18 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE | |
| 19 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
| 20 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
| 21 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
| 22 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
| 23 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
| 24 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
| 25 POSSIBILITY OF SUCH DAMAGE. | |
| 26 ***********************************************************************/ | |
| 27 | |
| 28 #ifdef HAVE_CONFIG_H | |
| 29 #include "config.h" | |
| 30 #endif | |
| 31 | |
| 32 #include "main.h" | |
| 33 | |
| 34 /* Limit, stabilize, convert and quantize NLSFs */ | |
| 35 void silk_process_NLSFs( | |
| 36 silk_encoder_state *psEncC, /* I/O Encoder state */ | |
| 37 opus_int16 PredCoef_Q12[ 2 ][ MAX_LPC_ORDER ], /* O Prediction coefficients */ | |
| 38 opus_int16 pNLSF_Q15[ MAX_LPC_ORDER ], /* I/O Normalized LSFs (quant out) (0 - (2^15-1)) */ | |
| 39 const opus_int16 prev_NLSFq_Q15[ MAX_LPC_ORDER ] /* I Previous Normalized LSFs (0 - (2^15-1)) */ | |
| 40 ) | |
| 41 { | |
| 42 opus_int i, doInterpolate; | |
| 43 opus_int NLSF_mu_Q20; | |
| 44 opus_int32 i_sqr_Q15; | |
| 45 opus_int16 pNLSF0_temp_Q15[ MAX_LPC_ORDER ]; | |
| 46 opus_int16 pNLSFW_QW[ MAX_LPC_ORDER ]; | |
| 47 opus_int16 pNLSFW0_temp_QW[ MAX_LPC_ORDER ]; | |
| 48 | |
| 49 silk_assert( psEncC->speech_activity_Q8 >= 0 ); | |
| 50 silk_assert( psEncC->speech_activity_Q8 <= SILK_FIX_CONST( 1.0, 8 ) ); | |
| 51 silk_assert( psEncC->useInterpolatedNLSFs == 1 || psEncC->indices.NLSFInterpCoef_Q2 == ( 1 << 2 ) ); | |
| 52 | |
| 53 /***********************/ | |
| 54 /* Calculate mu values */ | |
| 55 /***********************/ | |
| 56 /* NLSF_mu = 0.003 - 0.0015 * psEnc->speech_activity; */ | |
| 57 NLSF_mu_Q20 = silk_SMLAWB( SILK_FIX_CONST( 0.003, 20 ), SILK_FIX_CONST( -0.001, 28 ), psEncC->speech_activity_Q8 ); | |
| 58 if( psEncC->nb_subfr == 2 ) { | |
| 59 /* Multiply by 1.5 for 10 ms packets */ | |
| 60 NLSF_mu_Q20 = silk_ADD_RSHIFT( NLSF_mu_Q20, NLSF_mu_Q20, 1 ); | |
| 61 } | |
| 62 | |
| 63 silk_assert( NLSF_mu_Q20 > 0 ); | |
| 64 silk_assert( NLSF_mu_Q20 <= SILK_FIX_CONST( 0.005, 20 ) ); | |
| 65 | |
| 66 /* Calculate NLSF weights */ | |
| 67 silk_NLSF_VQ_weights_laroia( pNLSFW_QW, pNLSF_Q15, psEncC->predictLPCOrder ); | |
| 68 | |
| 69 /* Update NLSF weights for interpolated NLSFs */ | |
| 70 doInterpolate = ( psEncC->useInterpolatedNLSFs == 1 ) && ( psEncC->indices.NLSFInterpCoef_Q2 < 4 ); | |
| 71 if( doInterpolate ) { | |
| 72 /* Calculate the interpolated NLSF vector for the first half */ | |
| 73 silk_interpolate( pNLSF0_temp_Q15, prev_NLSFq_Q15, pNLSF_Q15, | |
| 74 psEncC->indices.NLSFInterpCoef_Q2, psEncC->predictLPCOrder ); | |
| 75 | |
| 76 /* Calculate first half NLSF weights for the interpolated NLSFs */ | |
| 77 silk_NLSF_VQ_weights_laroia( pNLSFW0_temp_QW, pNLSF0_temp_Q15, psEncC->predictLPCOrder ); | |
| 78 | |
| 79 /* Update NLSF weights with contribution from first half */ | |
| 80 i_sqr_Q15 = silk_LSHIFT( silk_SMULBB( psEncC->indices.NLSFInterpCoef_Q2, psEncC->indices.NLSFInterpCoef_Q2 ), 11 ); | |
| 81 for( i = 0; i < psEncC->predictLPCOrder; i++ ) { | |
| 82 pNLSFW_QW[ i ] = silk_SMLAWB( silk_RSHIFT( pNLSFW_QW[ i ], 1 ), (opus_int32)pNLSFW0_temp_QW[ i ], i_sqr_Q15 ); | |
| 83 silk_assert( pNLSFW_QW[ i ] >= 1 ); | |
| 84 } | |
| 85 } | |
| 86 | |
| 87 silk_NLSF_encode( psEncC->indices.NLSFIndices, pNLSF_Q15, psEncC->psNLSF_CB, pNLSFW_QW, | |
| 88 NLSF_mu_Q20, psEncC->NLSF_MSVQ_Survivors, psEncC->indices.signalType ); | |
| 89 | |
| 90 /* Convert quantized NLSFs back to LPC coefficients */ | |
| 91 silk_NLSF2A( PredCoef_Q12[ 1 ], pNLSF_Q15, psEncC->predictLPCOrder ); | |
| 92 | |
| 93 if( doInterpolate ) { | |
| 94 /* Calculate the interpolated, quantized LSF vector for the first half */ | |
| 95 silk_interpolate( pNLSF0_temp_Q15, prev_NLSFq_Q15, pNLSF_Q15, | |
| 96 psEncC->indices.NLSFInterpCoef_Q2, psEncC->predictLPCOrder ); | |
| 97 | |
| 98 /* Convert back to LPC coefficients */ | |
| 99 silk_NLSF2A( PredCoef_Q12[ 0 ], pNLSF0_temp_Q15, psEncC->predictLPCOrder ); | |
| 100 | |
| 101 } else { | |
| 102 /* Copy LPC coefficients for first half from second half */ | |
| 103 silk_memcpy( PredCoef_Q12[ 0 ], PredCoef_Q12[ 1 ], psEncC->predictLPCOrder * sizeof( opus_int16 ) ); | |
| 104 } | |
| 105 } |
