FreeCalypso > hg > gsm-codec-lib
view libgsmfr2/table.c @ 492:cc3a831712a4
libgsmhr1: implement arbitrary RTP input
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sat, 15 Jun 2024 06:52:37 +0000 |
parents | 19db59c9dc07 |
children |
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/* * This C source file has been adapted from TU-Berlin libgsm source, * original notice follows: * * Copyright 1992 by Jutta Degener and Carsten Bormann, Technische * Universitaet Berlin. See the accompanying file "COPYRIGHT" for * details. THERE IS ABSOLUTELY NO WARRANTY FOR THIS SOFTWARE. */ #include <stdint.h> #include "tw_gsmfr.h" #include "typedef.h" #include "ed_state.h" #include "ed_internal.h" /* 4.4 TABLES USED IN THE FIXED POINT IMPLEMENTATION OF THE RPE-LTP * CODER AND DECODER * * (Most of them inlined, so watch out.) */ /* Table 4.1 Quantization of the Log.-Area Ratios */ /* i 1 2 3 4 5 6 7 8 */ word gsm_A[8] = {20480, 20480, 20480, 20480, 13964, 15360, 8534, 9036}; word gsm_B[8] = { 0, 0, 2048, -2560, 94, -1792, -341, -1144}; word gsm_MIC[8] = { -32, -32, -16, -16, -8, -8, -4, -4 }; word gsm_MAC[8] = { 31, 31, 15, 15, 7, 7, 3, 3 }; /* Table 4.2 Tabulation of 1/A[1..8] */ word gsm_INVA[8]={ 13107, 13107, 13107, 13107, 19223, 17476, 31454, 29708 }; /* Table 4.3a Decision level of the LTP gain quantizer */ /* bc 0 1 2 3 */ word gsm_DLB[4] = { 6554, 16384, 26214, 32767 }; /* Table 4.3b Quantization levels of the LTP gain quantizer */ /* bc 0 1 2 3 */ word gsm_QLB[4] = { 3277, 11469, 21299, 32767 }; /* Table 4.4 Coefficients of the weighting filter */ /* i 0 1 2 3 4 5 6 7 8 9 10 */ word gsm_H[11] = {-134, -374, 0, 2054, 5741, 8192, 5741, 2054, 0, -374, -134 }; /* Table 4.5 Normalized inverse mantissa used to compute xM/xmax */ /* i 0 1 2 3 4 5 6 7 */ word gsm_NRFAC[8] = { 29128, 26215, 23832, 21846, 20165, 18725, 17476, 16384 }; /* Table 4.6 Normalized direct mantissa used to compute xM/xmax */ /* i 0 1 2 3 4 5 6 7 */ word gsm_FAC[8] = { 18431, 20479, 22527, 24575, 26623, 28671, 30719, 32767 };