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 ], /* I/O (un)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 const opus_int32 W_Q18[ MAX_NB_SUBFR*LTP_ORDER*LTP_ORDER ], /* I Error Weights in Q18 */ 41 opus_int mu_Q9, /* I Mu value (R/D tradeoff) */ 42 opus_int lowComplexity, /* I Flag for low complexity */ 43 const opus_int nb_subfr /* I number of subframes */ 44 ) 45 { 46 opus_int j, k, cbk_size; 47 opus_int8 temp_idx[ MAX_NB_SUBFR ]; 48 const opus_uint8 *cl_ptr_Q5; 49 const opus_int8 *cbk_ptr_Q7; 50 const opus_uint8 *cbk_gain_ptr_Q7; 51 const opus_int16 *b_Q14_ptr; 52 const opus_int32 *W_Q18_ptr; 53 opus_int32 rate_dist_Q14_subfr, rate_dist_Q14, min_rate_dist_Q14; 54 opus_int32 sum_log_gain_tmp_Q7, best_sum_log_gain_Q7, max_gain_Q7, gain_Q7; 55 56 /***************************************************/ 57 /* iterate over different codebooks with different */ 58 /* rates/distortions, and choose best */ 59 /***************************************************/ 60 min_rate_dist_Q14 = silk_int32_MAX; 61 best_sum_log_gain_Q7 = 0; 62 for( k = 0; k < 3; k++ ) { 63 /* Safety margin for pitch gain control, to take into account factors 64 such as state rescaling/rewhitening. */ 65 opus_int32 gain_safety = SILK_FIX_CONST( 0.4, 7 ); 66 67 cl_ptr_Q5 = silk_LTP_gain_BITS_Q5_ptrs[ k ]; 68 cbk_ptr_Q7 = silk_LTP_vq_ptrs_Q7[ k ]; 69 cbk_gain_ptr_Q7 = silk_LTP_vq_gain_ptrs_Q7[ k ]; 70 cbk_size = silk_LTP_vq_sizes[ k ]; 71 72 /* Set up pointer to first subframe */ 73 W_Q18_ptr = W_Q18; 74 b_Q14_ptr = B_Q14; 75 76 rate_dist_Q14 = 0; 77 sum_log_gain_tmp_Q7 = *sum_log_gain_Q7; 78 for( j = 0; j < nb_subfr; j++ ) { 79 max_gain_Q7 = silk_log2lin( ( SILK_FIX_CONST( MAX_SUM_LOG_GAIN_DB / 6.0, 7 ) - sum_log_gain_tmp_Q7 ) 80 + SILK_FIX_CONST( 7, 7 ) ) - gain_safety; 81 82 silk_VQ_WMat_EC( 83 &temp_idx[ j ], /* O index of best codebook vector */ 84 &rate_dist_Q14_subfr, /* O best weighted quantization error + mu * rate */ 85 &gain_Q7, /* O sum of absolute LTP coefficients */ 86 b_Q14_ptr, /* I input vector to be quantized */ 87 W_Q18_ptr, /* I weighting matrix */ 88 cbk_ptr_Q7, /* I codebook */ 89 cbk_gain_ptr_Q7, /* I codebook effective gains */ 90 cl_ptr_Q5, /* I code length for each codebook vector */ 91 mu_Q9, /* I tradeoff between weighted error and rate */ 92 max_gain_Q7, /* I maximum sum of absolute LTP coefficients */ 93 cbk_size /* I number of vectors in codebook */ 94 ); 95 96 rate_dist_Q14 = silk_ADD_POS_SAT32( rate_dist_Q14, rate_dist_Q14_subfr ); 97 sum_log_gain_tmp_Q7 = silk_max(0, sum_log_gain_tmp_Q7 98 + silk_lin2log( gain_safety + gain_Q7 ) - SILK_FIX_CONST( 7, 7 )); 99 100 b_Q14_ptr += LTP_ORDER; 101 W_Q18_ptr += LTP_ORDER * LTP_ORDER; 102 } 103 104 /* Avoid never finding a codebook */ 105 rate_dist_Q14 = silk_min( silk_int32_MAX - 1, rate_dist_Q14 ); 106 107 if( rate_dist_Q14 < min_rate_dist_Q14 ) { 108 min_rate_dist_Q14 = rate_dist_Q14; 109 *periodicity_index = (opus_int8)k; 110 silk_memcpy( cbk_index, temp_idx, nb_subfr * sizeof( opus_int8 ) ); 111 best_sum_log_gain_Q7 = sum_log_gain_tmp_Q7; 112 } 113 114 /* Break early in low-complexity mode if rate distortion is below threshold */ 115 if( lowComplexity && ( rate_dist_Q14 < silk_LTP_gain_middle_avg_RD_Q14 ) ) { 116 break; 117 } 118 } 119 120 cbk_ptr_Q7 = silk_LTP_vq_ptrs_Q7[ *periodicity_index ]; 121 for( j = 0; j < nb_subfr; j++ ) { 122 for( k = 0; k < LTP_ORDER; k++ ) { 123 B_Q14[ j * LTP_ORDER + k ] = silk_LSHIFT( cbk_ptr_Q7[ cbk_index[ j ] * LTP_ORDER + k ], 7 ); 124 } 125 } 126 *sum_log_gain_Q7 = best_sum_log_gain_Q7; 127 } 128 129
