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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 "structs.h"
     33 #include "define.h"
     34 #include "tables.h"
     35 
     36 #ifdef __cplusplus
     37 extern "C"
     38 {
     39 #endif
     40 
     41 /* Piece-wise linear mapping from bitrate in kbps to coding quality in dB SNR */
     42 const opus_int32 silk_TargetRate_table_NB[ TARGET_RATE_TAB_SZ ] = {
     43     0,      8000,   9400,   11500,  13500,  17500,  25000,  MAX_TARGET_RATE_BPS
     44 };
     45 const opus_int32 silk_TargetRate_table_MB[ TARGET_RATE_TAB_SZ ] = {
     46     0,      9000,   12000,  14500,  18500,  24500,  35500,  MAX_TARGET_RATE_BPS
     47 };
     48 const opus_int32 silk_TargetRate_table_WB[ TARGET_RATE_TAB_SZ ] = {
     49     0,      10500,  14000,  17000,  21500,  28500,  42000,  MAX_TARGET_RATE_BPS
     50 };
     51 const opus_int16 silk_SNR_table_Q1[ TARGET_RATE_TAB_SZ ] = {
     52     18,     29,     38,     40,     46,     52,     62,     84
     53 };
     54 
     55 /* Tables for stereo predictor coding */
     56 const opus_int16 silk_stereo_pred_quant_Q13[ STEREO_QUANT_TAB_SIZE ] = {
     57     -13732, -10050, -8266, -7526, -6500, -5000, -2950,  -820,
     58        820,   2950,  5000,  6500,  7526,  8266, 10050, 13732
     59 };
     60 const opus_uint8  silk_stereo_pred_joint_iCDF[ 25 ] = {
     61     249, 247, 246, 245, 244,
     62     234, 210, 202, 201, 200,
     63     197, 174,  82,  59,  56,
     64      55,  54,  46,  22,  12,
     65      11,  10,   9,   7,   0
     66 };
     67 const opus_uint8  silk_stereo_only_code_mid_iCDF[ 2 ] = { 64, 0 };
     68 
     69 /* Tables for LBRR flags */
     70 static const opus_uint8 silk_LBRR_flags_2_iCDF[ 3 ] = { 203, 150, 0 };
     71 static const opus_uint8 silk_LBRR_flags_3_iCDF[ 7 ] = { 215, 195, 166, 125, 110, 82, 0 };
     72 const opus_uint8 * const silk_LBRR_flags_iCDF_ptr[ 2 ] = {
     73     silk_LBRR_flags_2_iCDF,
     74     silk_LBRR_flags_3_iCDF
     75 };
     76 
     77 /* Table for LSB coding */
     78 const opus_uint8 silk_lsb_iCDF[ 2 ] = { 120, 0 };
     79 
     80 /* Tables for LTPScale */
     81 const opus_uint8 silk_LTPscale_iCDF[ 3 ] = { 128, 64, 0 };
     82 
     83 /* Tables for signal type and offset coding */
     84 const opus_uint8 silk_type_offset_VAD_iCDF[ 4 ] = {
     85        232,    158,    10,      0
     86 };
     87 const opus_uint8 silk_type_offset_no_VAD_iCDF[ 2 ] = {
     88        230,      0
     89 };
     90 
     91 /* Tables for NLSF interpolation factor */
     92 const opus_uint8 silk_NLSF_interpolation_factor_iCDF[ 5 ] = { 243, 221, 192, 181, 0 };
     93 
     94 /* Quantization offsets */
     95 const opus_int16  silk_Quantization_Offsets_Q10[ 2 ][ 2 ] = {
     96     { OFFSET_UVL_Q10, OFFSET_UVH_Q10 }, { OFFSET_VL_Q10, OFFSET_VH_Q10 }
     97 };
     98 
     99 /* Table for LTPScale */
    100 const opus_int16 silk_LTPScales_table_Q14[ 3 ] = { 15565, 12288, 8192 };
    101 
    102 /* Uniform entropy tables */
    103 const opus_uint8 silk_uniform3_iCDF[ 3 ] = { 171, 85, 0 };
    104 const opus_uint8 silk_uniform4_iCDF[ 4 ] = { 192, 128, 64, 0 };
    105 const opus_uint8 silk_uniform5_iCDF[ 5 ] = { 205, 154, 102, 51, 0 };
    106 const opus_uint8 silk_uniform6_iCDF[ 6 ] = { 213, 171, 128, 85, 43, 0 };
    107 const opus_uint8 silk_uniform8_iCDF[ 8 ] = { 224, 192, 160, 128, 96, 64, 32, 0 };
    108 
    109 const opus_uint8 silk_NLSF_EXT_iCDF[ 7 ] = { 100, 40, 16, 7, 3, 1, 0 };
    110 
    111 /*  Elliptic/Cauer filters designed with 0.1 dB passband ripple,
    112         80 dB minimum stopband attenuation, and
    113         [0.95 : 0.15 : 0.35] normalized cut off frequencies. */
    114 
    115 /* Interpolation points for filter coefficients used in the bandwidth transition smoother */
    116 const opus_int32 silk_Transition_LP_B_Q28[ TRANSITION_INT_NUM ][ TRANSITION_NB ] =
    117 {
    118 {    250767114,  501534038,  250767114  },
    119 {    209867381,  419732057,  209867381  },
    120 {    170987846,  341967853,  170987846  },
    121 {    131531482,  263046905,  131531482  },
    122 {     89306658,  178584282,   89306658  }
    123 };
    124 
    125 /* Interpolation points for filter coefficients used in the bandwidth transition smoother */
    126 const opus_int32 silk_Transition_LP_A_Q28[ TRANSITION_INT_NUM ][ TRANSITION_NA ] =
    127 {
    128 {    506393414,  239854379  },
    129 {    411067935,  169683996  },
    130 {    306733530,  116694253  },
    131 {    185807084,   77959395  },
    132 {     35497197,   57401098  }
    133 };
    134 
    135 #ifdef __cplusplus
    136 }
    137 #endif
    138 
    139