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 #include "tuning_parameters.h" 34 35 void silk_quant_LTP_gains( 36 opus_int16 B_Q14[ MAX_NB_SUBFR * LTP_ORDER ], /* O Quantized LTP gains */ 37 opus_int8 cbk_index[ MAX_NB_SUBFR ], /* O Codebook Index */ 38 opus_int8 *periodicity_index, /* O Periodicity Index */ 39 opus_int32 *sum_log_gain_Q7, /* I/O Cumulative max prediction gain */ 40 opus_int *pred_gain_dB_Q7, /* O LTP prediction gain */ 41 const opus_int32 XX_Q17[ MAX_NB_SUBFR*LTP_ORDER*LTP_ORDER ], /* I Correlation matrix in Q18 */ 42 const opus_int32 xX_Q17[ MAX_NB_SUBFR*LTP_ORDER ], /* I Correlation vector in Q18 */ 43 const opus_int subfr_len, /* I Number of samples per subframe */ 44 const opus_int nb_subfr, /* I Number of subframes */ 45 int arch /* I Run-time architecture */ 46 ) 47 { 48 opus_int j, k, cbk_size; 49 opus_int8 temp_idx[ MAX_NB_SUBFR ]; 50 const opus_uint8 *cl_ptr_Q5; 51 const opus_int8 *cbk_ptr_Q7; 52 const opus_uint8 *cbk_gain_ptr_Q7; 53 const opus_int32 *XX_Q17_ptr, *xX_Q17_ptr; 54 opus_int32 res_nrg_Q15_subfr, res_nrg_Q15, rate_dist_Q7_subfr, rate_dist_Q7, min_rate_dist_Q7; 55 opus_int32 sum_log_gain_tmp_Q7, best_sum_log_gain_Q7, max_gain_Q7; 56 opus_int gain_Q7; 57 58 /***************************************************/ 59 /* iterate over different codebooks with different */ 60 /* rates/distortions, and choose best */ 61 /***************************************************/ 62 min_rate_dist_Q7 = silk_int32_MAX; 63 best_sum_log_gain_Q7 = 0; 64 for( k = 0; k < 3; k++ ) { 65 /* Safety margin for pitch gain control, to take into account factors 66 such as state rescaling/rewhitening. */ 67 opus_int32 gain_safety = SILK_FIX_CONST( 0.4, 7 ); 68 69 cl_ptr_Q5 = silk_LTP_gain_BITS_Q5_ptrs[ k ]; 70 cbk_ptr_Q7 = silk_LTP_vq_ptrs_Q7[ k ]; 71 cbk_gain_ptr_Q7 = silk_LTP_vq_gain_ptrs_Q7[ k ]; 72 cbk_size = silk_LTP_vq_sizes[ k ]; 73 74 /* Set up pointers to first subframe */ 75 XX_Q17_ptr = XX_Q17; 76 xX_Q17_ptr = xX_Q17; 77 78 res_nrg_Q15 = 0; 79 rate_dist_Q7 = 0; 80 sum_log_gain_tmp_Q7 = *sum_log_gain_Q7; 81 for( j = 0; j < nb_subfr; j++ ) { 82 max_gain_Q7 = silk_log2lin( ( SILK_FIX_CONST( MAX_SUM_LOG_GAIN_DB / 6.0, 7 ) - sum_log_gain_tmp_Q7 ) 83 + SILK_FIX_CONST( 7, 7 ) ) - gain_safety; 84 silk_VQ_WMat_EC( 85 &temp_idx[ j ], /* O index of best codebook vector */ 86 &res_nrg_Q15_subfr, /* O residual energy */ 87 &rate_dist_Q7_subfr, /* O best weighted quantization error + mu * rate */ 88 &gain_Q7, /* O sum of absolute LTP coefficients */ 89 XX_Q17_ptr, /* I correlation matrix */ 90 xX_Q17_ptr, /* I correlation vector */ 91 cbk_ptr_Q7, /* I codebook */ 92 cbk_gain_ptr_Q7, /* I codebook effective gains */ 93 cl_ptr_Q5, /* I code length for each codebook vector */ 94 subfr_len, /* I number of samples per subframe */ 95 max_gain_Q7, /* I maximum sum of absolute LTP coefficients */ 96 cbk_size, /* I number of vectors in codebook */ 97 arch /* I Run-time architecture */ 98 ); 99 100 res_nrg_Q15 = silk_ADD_POS_SAT32( res_nrg_Q15, res_nrg_Q15_subfr ); 101 rate_dist_Q7 = silk_ADD_POS_SAT32( rate_dist_Q7, rate_dist_Q7_subfr ); 102 sum_log_gain_tmp_Q7 = silk_max(0, sum_log_gain_tmp_Q7 103 + silk_lin2log( gain_safety + gain_Q7 ) - SILK_FIX_CONST( 7, 7 )); 104 105 XX_Q17_ptr += LTP_ORDER * LTP_ORDER; 106 xX_Q17_ptr += LTP_ORDER; 107 } 108 109 if( rate_dist_Q7 <= min_rate_dist_Q7 ) { 110 min_rate_dist_Q7 = rate_dist_Q7; 111 *periodicity_index = (opus_int8)k; 112 silk_memcpy( cbk_index, temp_idx, nb_subfr * sizeof( opus_int8 ) ); 113 best_sum_log_gain_Q7 = sum_log_gain_tmp_Q7; 114 } 115 } 116 117 cbk_ptr_Q7 = silk_LTP_vq_ptrs_Q7[ *periodicity_index ]; 118 for( j = 0; j < nb_subfr; j++ ) { 119 for( k = 0; k < LTP_ORDER; k++ ) { 120 B_Q14[ j * LTP_ORDER + k ] = silk_LSHIFT( cbk_ptr_Q7[ cbk_index[ j ] * LTP_ORDER + k ], 7 ); 121 } 122 } 123 124 if( nb_subfr == 2 ) { 125 res_nrg_Q15 = silk_RSHIFT32( res_nrg_Q15, 1 ); 126 } else { 127 res_nrg_Q15 = silk_RSHIFT32( res_nrg_Q15, 2 ); 128 } 129 130 *sum_log_gain_Q7 = best_sum_log_gain_Q7; 131 *pred_gain_dB_Q7 = (opus_int)silk_SMULBB( -3, silk_lin2log( res_nrg_Q15 ) - ( 15 << 7 ) ); 132 } 133
