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comparison: media/libopus/silk/decode_parameters.c
media/libopus/silk/decode_parameters.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 /* Decode parameters from payload */ | |
| 35 void silk_decode_parameters( | |
| 36 silk_decoder_state *psDec, /* I/O State */ | |
| 37 silk_decoder_control *psDecCtrl, /* I/O Decoder control */ | |
| 38 opus_int condCoding /* I The type of conditional coding to use */ | |
| 39 ) | |
| 40 { | |
| 41 opus_int i, k, Ix; | |
| 42 opus_int16 pNLSF_Q15[ MAX_LPC_ORDER ], pNLSF0_Q15[ MAX_LPC_ORDER ]; | |
| 43 const opus_int8 *cbk_ptr_Q7; | |
| 44 | |
| 45 /* Dequant Gains */ | |
| 46 silk_gains_dequant( psDecCtrl->Gains_Q16, psDec->indices.GainsIndices, | |
| 47 &psDec->LastGainIndex, condCoding == CODE_CONDITIONALLY, psDec->nb_subfr ); | |
| 48 | |
| 49 /****************/ | |
| 50 /* Decode NLSFs */ | |
| 51 /****************/ | |
| 52 silk_NLSF_decode( pNLSF_Q15, psDec->indices.NLSFIndices, psDec->psNLSF_CB ); | |
| 53 | |
| 54 /* Convert NLSF parameters to AR prediction filter coefficients */ | |
| 55 silk_NLSF2A( psDecCtrl->PredCoef_Q12[ 1 ], pNLSF_Q15, psDec->LPC_order ); | |
| 56 | |
| 57 /* If just reset, e.g., because internal Fs changed, do not allow interpolation */ | |
| 58 /* improves the case of packet loss in the first frame after a switch */ | |
| 59 if( psDec->first_frame_after_reset == 1 ) { | |
| 60 psDec->indices.NLSFInterpCoef_Q2 = 4; | |
| 61 } | |
| 62 | |
| 63 if( psDec->indices.NLSFInterpCoef_Q2 < 4 ) { | |
| 64 /* Calculation of the interpolated NLSF0 vector from the interpolation factor, */ | |
| 65 /* the previous NLSF1, and the current NLSF1 */ | |
| 66 for( i = 0; i < psDec->LPC_order; i++ ) { | |
| 67 pNLSF0_Q15[ i ] = psDec->prevNLSF_Q15[ i ] + silk_RSHIFT( silk_MUL( psDec->indices.NLSFInterpCoef_Q2, | |
| 68 pNLSF_Q15[ i ] - psDec->prevNLSF_Q15[ i ] ), 2 ); | |
| 69 } | |
| 70 | |
| 71 /* Convert NLSF parameters to AR prediction filter coefficients */ | |
| 72 silk_NLSF2A( psDecCtrl->PredCoef_Q12[ 0 ], pNLSF0_Q15, psDec->LPC_order ); | |
| 73 } else { | |
| 74 /* Copy LPC coefficients for first half from second half */ | |
| 75 silk_memcpy( psDecCtrl->PredCoef_Q12[ 0 ], psDecCtrl->PredCoef_Q12[ 1 ], psDec->LPC_order * sizeof( opus_int16 ) ); | |
| 76 } | |
| 77 | |
| 78 silk_memcpy( psDec->prevNLSF_Q15, pNLSF_Q15, psDec->LPC_order * sizeof( opus_int16 ) ); | |
| 79 | |
| 80 /* After a packet loss do BWE of LPC coefs */ | |
| 81 if( psDec->lossCnt ) { | |
| 82 silk_bwexpander( psDecCtrl->PredCoef_Q12[ 0 ], psDec->LPC_order, BWE_AFTER_LOSS_Q16 ); | |
| 83 silk_bwexpander( psDecCtrl->PredCoef_Q12[ 1 ], psDec->LPC_order, BWE_AFTER_LOSS_Q16 ); | |
| 84 } | |
| 85 | |
| 86 if( psDec->indices.signalType == TYPE_VOICED ) { | |
| 87 /*********************/ | |
| 88 /* Decode pitch lags */ | |
| 89 /*********************/ | |
| 90 | |
| 91 /* Decode pitch values */ | |
| 92 silk_decode_pitch( psDec->indices.lagIndex, psDec->indices.contourIndex, psDecCtrl->pitchL, psDec->fs_kHz, psDec->nb_subfr ); | |
| 93 | |
| 94 /* Decode Codebook Index */ | |
| 95 cbk_ptr_Q7 = silk_LTP_vq_ptrs_Q7[ psDec->indices.PERIndex ]; /* set pointer to start of codebook */ | |
| 96 | |
| 97 for( k = 0; k < psDec->nb_subfr; k++ ) { | |
| 98 Ix = psDec->indices.LTPIndex[ k ]; | |
| 99 for( i = 0; i < LTP_ORDER; i++ ) { | |
| 100 psDecCtrl->LTPCoef_Q14[ k * LTP_ORDER + i ] = silk_LSHIFT( cbk_ptr_Q7[ Ix * LTP_ORDER + i ], 7 ); | |
| 101 } | |
| 102 } | |
| 103 | |
| 104 /**********************/ | |
| 105 /* Decode LTP scaling */ | |
| 106 /**********************/ | |
| 107 Ix = psDec->indices.LTP_scaleIndex; | |
| 108 psDecCtrl->LTP_scale_Q14 = silk_LTPScales_table_Q14[ Ix ]; | |
| 109 } else { | |
| 110 silk_memset( psDecCtrl->pitchL, 0, psDec->nb_subfr * sizeof( opus_int ) ); | |
| 111 silk_memset( psDecCtrl->LTPCoef_Q14, 0, LTP_ORDER * psDec->nb_subfr * sizeof( opus_int16 ) ); | |
| 112 psDec->indices.PERIndex = 0; | |
| 113 psDecCtrl->LTP_scale_Q14 = 0; | |
| 114 } | |
| 115 } |
