Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 1 | /*********************************************************************** |
| 2 | Copyright (c) 2006-2011, Skype Limited. All rights reserved. |
| 3 | Redistribution and use in source and binary forms, with or without |
Jean-Marc Valin | ae00e60 | 2012-04-20 16:31:04 -0400 | [diff] [blame] | 4 | modification, are permitted provided that the following conditions |
| 5 | are met: |
Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 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. |
Ralph Giles | f2446c2 | 2013-09-16 14:40:04 -0700 | [diff] [blame] | 11 | - Neither the name of Internet Society, IETF or IETF Trust, nor the |
Jean-Marc Valin | ae00e60 | 2012-04-20 16:31:04 -0400 | [diff] [blame] | 12 | names of specific contributors, may be used to endorse or promote |
| 13 | products derived from this software without specific prior written |
| 14 | permission. |
Timothy B. Terriberry | 80ad383 | 2013-05-19 18:00:39 -0700 | [diff] [blame] | 15 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
Jean-Marc Valin | ae00e60 | 2012-04-20 16:31:04 -0400 | [diff] [blame] | 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. |
Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 26 | ***********************************************************************/ |
| 27 | |
Jean-Marc Valin | 5a48412 | 2011-08-15 10:49:53 -0400 | [diff] [blame] | 28 | #ifdef HAVE_CONFIG_H |
| 29 | #include "config.h" |
| 30 | #endif |
| 31 | |
Jean-Marc Valin | 1c2f563 | 2011-09-16 01:16:53 -0700 | [diff] [blame] | 32 | #include "main.h" |
Timothy B. Terriberry | 6f2d9f5 | 2012-09-05 07:35:49 -0700 | [diff] [blame] | 33 | #include "stack_alloc.h" |
Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 34 | |
| 35 | /**********************************************************/ |
| 36 | /* Core decoder. Performs inverse NSQ operation LTP + LPC */ |
| 37 | /**********************************************************/ |
| 38 | void silk_decode_core( |
Koen Vos | acc7a6c | 2011-10-28 19:44:26 -0400 | [diff] [blame] | 39 | silk_decoder_state *psDec, /* I/O Decoder state */ |
| 40 | silk_decoder_control *psDecCtrl, /* I Decoder control */ |
| 41 | opus_int16 xq[], /* O Decoded speech */ |
xiangmingzhu | c95c9a0 | 2014-04-30 15:48:07 +0800 | [diff] [blame] | 42 | const opus_int16 pulses[ MAX_FRAME_LENGTH ], /* I Pulse signal */ |
| 43 | int arch /* I Run-time architecture */ |
Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 44 | ) |
| 45 | { |
Koen Vos | bf75c8e | 2011-12-13 14:47:31 -0500 | [diff] [blame] | 46 | opus_int i, k, lag = 0, start_idx, sLTP_buf_idx, NLSF_interpolation_flag, signalType; |
Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 47 | opus_int16 *A_Q12, *B_Q14, *pxq, A_Q12_tmp[ MAX_LPC_ORDER ]; |
Timothy B. Terriberry | 6f2d9f5 | 2012-09-05 07:35:49 -0700 | [diff] [blame] | 48 | VARDECL( opus_int16, sLTP ); |
| 49 | VARDECL( opus_int32, sLTP_Q15 ); |
Koen Vos | bbfc9c9 | 2011-12-13 14:50:12 -0500 | [diff] [blame] | 50 | opus_int32 LTP_pred_Q13, LPC_pred_Q10, Gain_Q10, inv_gain_Q31, gain_adj_Q16, rand_seed, offset_Q10; |
Koen Vos | a51ebd6 | 2011-12-14 11:39:29 -0500 | [diff] [blame] | 51 | opus_int32 *pred_lag_ptr, *pexc_Q14, *pres_Q14; |
Timothy B. Terriberry | 6f2d9f5 | 2012-09-05 07:35:49 -0700 | [diff] [blame] | 52 | VARDECL( opus_int32, res_Q14 ); |
| 53 | VARDECL( opus_int32, sLPC_Q14 ); |
| 54 | SAVE_STACK; |
Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 55 | |
Koen Vos | a51ebd6 | 2011-12-14 11:39:29 -0500 | [diff] [blame] | 56 | silk_assert( psDec->prev_gain_Q16 != 0 ); |
Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 57 | |
Timothy B. Terriberry | 6f2d9f5 | 2012-09-05 07:35:49 -0700 | [diff] [blame] | 58 | ALLOC( sLTP, psDec->ltp_mem_length, opus_int16 ); |
| 59 | ALLOC( sLTP_Q15, psDec->ltp_mem_length + psDec->frame_length, opus_int32 ); |
| 60 | ALLOC( res_Q14, psDec->subfr_length, opus_int32 ); |
| 61 | ALLOC( sLPC_Q14, psDec->subfr_length + MAX_LPC_ORDER, opus_int32 ); |
| 62 | |
Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 63 | offset_Q10 = silk_Quantization_Offsets_Q10[ psDec->indices.signalType >> 1 ][ psDec->indices.quantOffsetType ]; |
| 64 | |
| 65 | if( psDec->indices.NLSFInterpCoef_Q2 < 1 << 2 ) { |
| 66 | NLSF_interpolation_flag = 1; |
| 67 | } else { |
| 68 | NLSF_interpolation_flag = 0; |
| 69 | } |
| 70 | |
| 71 | /* Decode excitation */ |
| 72 | rand_seed = psDec->indices.Seed; |
| 73 | for( i = 0; i < psDec->frame_length; i++ ) { |
Jean-Marc Valin | fb3a437 | 2011-09-16 00:58:26 -0700 | [diff] [blame] | 74 | rand_seed = silk_RAND( rand_seed ); |
Koen Vos | a51ebd6 | 2011-12-14 11:39:29 -0500 | [diff] [blame] | 75 | psDec->exc_Q14[ i ] = silk_LSHIFT( (opus_int32)pulses[ i ], 14 ); |
| 76 | if( psDec->exc_Q14[ i ] > 0 ) { |
| 77 | psDec->exc_Q14[ i ] -= QUANT_LEVEL_ADJUST_Q10 << 4; |
Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 78 | } else |
Koen Vos | a51ebd6 | 2011-12-14 11:39:29 -0500 | [diff] [blame] | 79 | if( psDec->exc_Q14[ i ] < 0 ) { |
| 80 | psDec->exc_Q14[ i ] += QUANT_LEVEL_ADJUST_Q10 << 4; |
Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 81 | } |
Koen Vos | a51ebd6 | 2011-12-14 11:39:29 -0500 | [diff] [blame] | 82 | psDec->exc_Q14[ i ] += offset_Q10 << 4; |
Koen Vos | 54518c8 | 2012-01-31 01:51:22 -0500 | [diff] [blame] | 83 | if( rand_seed < 0 ) { |
Jean-Marc Valin | ee8adbe | 2012-01-24 14:45:08 +1300 | [diff] [blame] | 84 | psDec->exc_Q14[ i ] = -psDec->exc_Q14[ i ]; |
Koen Vos | 54518c8 | 2012-01-31 01:51:22 -0500 | [diff] [blame] | 85 | } |
Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 86 | |
Koen Vos | a51ebd6 | 2011-12-14 11:39:29 -0500 | [diff] [blame] | 87 | rand_seed = silk_ADD32_ovflw( rand_seed, pulses[ i ] ); |
Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 88 | } |
| 89 | |
Koen Vos | 3195f6c | 2011-10-10 20:46:32 -0400 | [diff] [blame] | 90 | /* Copy LPC state */ |
| 91 | silk_memcpy( sLPC_Q14, psDec->sLPC_Q14_buf, MAX_LPC_ORDER * sizeof( opus_int32 ) ); |
| 92 | |
Koen Vos | a51ebd6 | 2011-12-14 11:39:29 -0500 | [diff] [blame] | 93 | pexc_Q14 = psDec->exc_Q14; |
Koen Vos | 3195f6c | 2011-10-10 20:46:32 -0400 | [diff] [blame] | 94 | pxq = xq; |
Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 95 | sLTP_buf_idx = psDec->ltp_mem_length; |
| 96 | /* Loop over subframes */ |
| 97 | for( k = 0; k < psDec->nb_subfr; k++ ) { |
Koen Vos | a51ebd6 | 2011-12-14 11:39:29 -0500 | [diff] [blame] | 98 | pres_Q14 = res_Q14; |
Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 99 | A_Q12 = psDecCtrl->PredCoef_Q12[ k >> 1 ]; |
| 100 | |
| 101 | /* Preload LPC coeficients to array on stack. Gives small performance gain */ |
Jean-Marc Valin | fb3a437 | 2011-09-16 00:58:26 -0700 | [diff] [blame] | 102 | silk_memcpy( A_Q12_tmp, A_Q12, psDec->LPC_order * sizeof( opus_int16 ) ); |
Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 103 | B_Q14 = &psDecCtrl->LTPCoef_Q14[ k * LTP_ORDER ]; |
Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 104 | signalType = psDec->indices.signalType; |
| 105 | |
Koen Vos | 8887566 | 2011-10-06 13:38:26 -0400 | [diff] [blame] | 106 | Gain_Q10 = silk_RSHIFT( psDecCtrl->Gains_Q16[ k ], 6 ); |
Koen Vos | bbfc9c9 | 2011-12-13 14:50:12 -0500 | [diff] [blame] | 107 | inv_gain_Q31 = silk_INVERSE32_varQ( psDecCtrl->Gains_Q16[ k ], 47 ); |
Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 108 | |
Koen Vos | bbfc9c9 | 2011-12-13 14:50:12 -0500 | [diff] [blame] | 109 | /* Calculate gain adjustment factor */ |
Koen Vos | a51ebd6 | 2011-12-14 11:39:29 -0500 | [diff] [blame] | 110 | if( psDecCtrl->Gains_Q16[ k ] != psDec->prev_gain_Q16 ) { |
| 111 | gain_adj_Q16 = silk_DIV32_varQ( psDec->prev_gain_Q16, psDecCtrl->Gains_Q16[ k ], 16 ); |
Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 112 | |
| 113 | /* Scale short term state */ |
| 114 | for( i = 0; i < MAX_LPC_ORDER; i++ ) { |
Koen Vos | 3195f6c | 2011-10-10 20:46:32 -0400 | [diff] [blame] | 115 | sLPC_Q14[ i ] = silk_SMULWW( gain_adj_Q16, sLPC_Q14[ i ] ); |
Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 116 | } |
Koen Vos | bbfc9c9 | 2011-12-13 14:50:12 -0500 | [diff] [blame] | 117 | } else { |
Jean-Marc Valin | 905197d | 2012-03-08 14:09:09 -0500 | [diff] [blame] | 118 | gain_adj_Q16 = (opus_int32)1 << 16; |
Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 119 | } |
| 120 | |
| 121 | /* Save inv_gain */ |
Koen Vos | bbfc9c9 | 2011-12-13 14:50:12 -0500 | [diff] [blame] | 122 | silk_assert( inv_gain_Q31 != 0 ); |
Koen Vos | a51ebd6 | 2011-12-14 11:39:29 -0500 | [diff] [blame] | 123 | psDec->prev_gain_Q16 = psDecCtrl->Gains_Q16[ k ]; |
Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 124 | |
| 125 | /* Avoid abrupt transition from voiced PLC to unvoiced normal decoding */ |
| 126 | if( psDec->lossCnt && psDec->prevSignalType == TYPE_VOICED && |
| 127 | psDec->indices.signalType != TYPE_VOICED && k < MAX_NB_SUBFR/2 ) { |
| 128 | |
Jean-Marc Valin | fb3a437 | 2011-09-16 00:58:26 -0700 | [diff] [blame] | 129 | silk_memset( B_Q14, 0, LTP_ORDER * sizeof( opus_int16 ) ); |
Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 130 | B_Q14[ LTP_ORDER/2 ] = SILK_FIX_CONST( 0.25, 14 ); |
| 131 | |
| 132 | signalType = TYPE_VOICED; |
| 133 | psDecCtrl->pitchL[ k ] = psDec->lagPrev; |
| 134 | } |
| 135 | |
| 136 | if( signalType == TYPE_VOICED ) { |
| 137 | /* Voiced */ |
| 138 | lag = psDecCtrl->pitchL[ k ]; |
| 139 | |
| 140 | /* Re-whitening */ |
Koen Vos | 3195f6c | 2011-10-10 20:46:32 -0400 | [diff] [blame] | 141 | if( k == 0 || ( k == 2 && NLSF_interpolation_flag ) ) { |
Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 142 | /* Rewhiten with new A coefs */ |
| 143 | start_idx = psDec->ltp_mem_length - lag - psDec->LPC_order - LTP_ORDER / 2; |
Jean-Marc Valin | fb3a437 | 2011-09-16 00:58:26 -0700 | [diff] [blame] | 144 | silk_assert( start_idx > 0 ); |
Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 145 | |
Koen Vos | 3195f6c | 2011-10-10 20:46:32 -0400 | [diff] [blame] | 146 | if( k == 2 ) { |
| 147 | silk_memcpy( &psDec->outBuf[ psDec->ltp_mem_length ], xq, 2 * psDec->subfr_length * sizeof( opus_int16 ) ); |
| 148 | } |
| 149 | |
Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 150 | silk_LPC_analysis_filter( &sLTP[ start_idx ], &psDec->outBuf[ start_idx + k * psDec->subfr_length ], |
xiangmingzhu | c95c9a0 | 2014-04-30 15:48:07 +0800 | [diff] [blame] | 151 | A_Q12, psDec->ltp_mem_length - start_idx, psDec->LPC_order, arch ); |
Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 152 | |
| 153 | /* After rewhitening the LTP state is unscaled */ |
Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 154 | if( k == 0 ) { |
Koen Vos | 3195f6c | 2011-10-10 20:46:32 -0400 | [diff] [blame] | 155 | /* Do LTP downscaling to reduce inter-packet dependency */ |
Koen Vos | bf75c8e | 2011-12-13 14:47:31 -0500 | [diff] [blame] | 156 | inv_gain_Q31 = silk_LSHIFT( silk_SMULWB( inv_gain_Q31, psDecCtrl->LTP_scale_Q14 ), 2 ); |
Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 157 | } |
| 158 | for( i = 0; i < lag + LTP_ORDER/2; i++ ) { |
Koen Vos | bf75c8e | 2011-12-13 14:47:31 -0500 | [diff] [blame] | 159 | sLTP_Q15[ sLTP_buf_idx - i - 1 ] = silk_SMULWB( inv_gain_Q31, sLTP[ psDec->ltp_mem_length - i - 1 ] ); |
Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 160 | } |
| 161 | } else { |
| 162 | /* Update LTP state when Gain changes */ |
Jean-Marc Valin | 905197d | 2012-03-08 14:09:09 -0500 | [diff] [blame] | 163 | if( gain_adj_Q16 != (opus_int32)1 << 16 ) { |
Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 164 | for( i = 0; i < lag + LTP_ORDER/2; i++ ) { |
Koen Vos | bf75c8e | 2011-12-13 14:47:31 -0500 | [diff] [blame] | 165 | sLTP_Q15[ sLTP_buf_idx - i - 1 ] = silk_SMULWW( gain_adj_Q16, sLTP_Q15[ sLTP_buf_idx - i - 1 ] ); |
Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 166 | } |
| 167 | } |
| 168 | } |
| 169 | } |
| 170 | |
| 171 | /* Long-term prediction */ |
| 172 | if( signalType == TYPE_VOICED ) { |
Koen Vos | bf75c8e | 2011-12-13 14:47:31 -0500 | [diff] [blame] | 173 | /* Set up pointer */ |
| 174 | pred_lag_ptr = &sLTP_Q15[ sLTP_buf_idx - lag + LTP_ORDER / 2 ]; |
Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 175 | for( i = 0; i < psDec->subfr_length; i++ ) { |
| 176 | /* Unrolled loop */ |
Koen Vos | bbfc9c9 | 2011-12-13 14:50:12 -0500 | [diff] [blame] | 177 | /* Avoids introducing a bias because silk_SMLAWB() always rounds to -inf */ |
| 178 | LTP_pred_Q13 = 2; |
| 179 | LTP_pred_Q13 = silk_SMLAWB( LTP_pred_Q13, pred_lag_ptr[ 0 ], B_Q14[ 0 ] ); |
Koen Vos | bf75c8e | 2011-12-13 14:47:31 -0500 | [diff] [blame] | 180 | LTP_pred_Q13 = silk_SMLAWB( LTP_pred_Q13, pred_lag_ptr[ -1 ], B_Q14[ 1 ] ); |
| 181 | LTP_pred_Q13 = silk_SMLAWB( LTP_pred_Q13, pred_lag_ptr[ -2 ], B_Q14[ 2 ] ); |
| 182 | LTP_pred_Q13 = silk_SMLAWB( LTP_pred_Q13, pred_lag_ptr[ -3 ], B_Q14[ 3 ] ); |
| 183 | LTP_pred_Q13 = silk_SMLAWB( LTP_pred_Q13, pred_lag_ptr[ -4 ], B_Q14[ 4 ] ); |
Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 184 | pred_lag_ptr++; |
| 185 | |
| 186 | /* Generate LPC excitation */ |
Koen Vos | a51ebd6 | 2011-12-14 11:39:29 -0500 | [diff] [blame] | 187 | pres_Q14[ i ] = silk_ADD_LSHIFT32( pexc_Q14[ i ], LTP_pred_Q13, 1 ); |
Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 188 | |
| 189 | /* Update states */ |
Koen Vos | a51ebd6 | 2011-12-14 11:39:29 -0500 | [diff] [blame] | 190 | sLTP_Q15[ sLTP_buf_idx ] = silk_LSHIFT( pres_Q14[ i ], 1 ); |
Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 191 | sLTP_buf_idx++; |
| 192 | } |
| 193 | } else { |
Koen Vos | a51ebd6 | 2011-12-14 11:39:29 -0500 | [diff] [blame] | 194 | pres_Q14 = pexc_Q14; |
Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 195 | } |
| 196 | |
Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 197 | for( i = 0; i < psDec->subfr_length; i++ ) { |
Koen Vos | bf75c8e | 2011-12-13 14:47:31 -0500 | [diff] [blame] | 198 | /* Short-term prediction */ |
| 199 | silk_assert( psDec->LPC_order == 10 || psDec->LPC_order == 16 ); |
Koen Vos | bbfc9c9 | 2011-12-13 14:50:12 -0500 | [diff] [blame] | 200 | /* Avoids introducing a bias because silk_SMLAWB() always rounds to -inf */ |
| 201 | LPC_pred_Q10 = silk_RSHIFT( psDec->LPC_order, 1 ); |
| 202 | LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i - 1 ], A_Q12_tmp[ 0 ] ); |
Koen Vos | 3195f6c | 2011-10-10 20:46:32 -0400 | [diff] [blame] | 203 | LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i - 2 ], A_Q12_tmp[ 1 ] ); |
| 204 | LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i - 3 ], A_Q12_tmp[ 2 ] ); |
| 205 | LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i - 4 ], A_Q12_tmp[ 3 ] ); |
| 206 | LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i - 5 ], A_Q12_tmp[ 4 ] ); |
| 207 | LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i - 6 ], A_Q12_tmp[ 5 ] ); |
| 208 | LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i - 7 ], A_Q12_tmp[ 6 ] ); |
| 209 | LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i - 8 ], A_Q12_tmp[ 7 ] ); |
| 210 | LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i - 9 ], A_Q12_tmp[ 8 ] ); |
| 211 | LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i - 10 ], A_Q12_tmp[ 9 ] ); |
Koen Vos | bf75c8e | 2011-12-13 14:47:31 -0500 | [diff] [blame] | 212 | if( psDec->LPC_order == 16 ) { |
| 213 | LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i - 11 ], A_Q12_tmp[ 10 ] ); |
| 214 | LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i - 12 ], A_Q12_tmp[ 11 ] ); |
| 215 | LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i - 13 ], A_Q12_tmp[ 12 ] ); |
| 216 | LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i - 14 ], A_Q12_tmp[ 13 ] ); |
| 217 | LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i - 15 ], A_Q12_tmp[ 14 ] ); |
| 218 | LPC_pred_Q10 = silk_SMLAWB( LPC_pred_Q10, sLPC_Q14[ MAX_LPC_ORDER + i - 16 ], A_Q12_tmp[ 15 ] ); |
Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 219 | } |
| 220 | |
| 221 | /* Add prediction to LPC excitation */ |
Felicia Lim | 5ead149 | 2016-06-04 10:10:52 -0400 | [diff] [blame] | 222 | sLPC_Q14[ MAX_LPC_ORDER + i ] = silk_ADD_SAT32( pres_Q14[ i ], silk_LSHIFT_SAT32( LPC_pred_Q10, 4 ) ); |
Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 223 | |
Koen Vos | bbfc9c9 | 2011-12-13 14:50:12 -0500 | [diff] [blame] | 224 | /* Scale with gain */ |
Koen Vos | bf75c8e | 2011-12-13 14:47:31 -0500 | [diff] [blame] | 225 | pxq[ i ] = (opus_int16)silk_SAT16( silk_RSHIFT_ROUND( silk_SMULWW( sLPC_Q14[ MAX_LPC_ORDER + i ], Gain_Q10 ), 8 ) ); |
Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 226 | } |
| 227 | |
| 228 | /* Update LPC filter state */ |
Koen Vos | 3195f6c | 2011-10-10 20:46:32 -0400 | [diff] [blame] | 229 | silk_memcpy( sLPC_Q14, &sLPC_Q14[ psDec->subfr_length ], MAX_LPC_ORDER * sizeof( opus_int32 ) ); |
Koen Vos | a51ebd6 | 2011-12-14 11:39:29 -0500 | [diff] [blame] | 230 | pexc_Q14 += psDec->subfr_length; |
Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 231 | pxq += psDec->subfr_length; |
| 232 | } |
| 233 | |
Koen Vos | 3195f6c | 2011-10-10 20:46:32 -0400 | [diff] [blame] | 234 | /* Save LPC state */ |
| 235 | silk_memcpy( psDec->sLPC_Q14_buf, sLPC_Q14, MAX_LPC_ORDER * sizeof( opus_int32 ) ); |
Timothy B. Terriberry | 6f2d9f5 | 2012-09-05 07:35:49 -0700 | [diff] [blame] | 236 | RESTORE_STACK; |
Gregory Maxwell | ae23114 | 2011-07-30 08:18:48 -0400 | [diff] [blame] | 237 | } |