FreeCalypso > hg > gsm-codec-lib

comparison libgsmfr2/table.c @ 272:19db59c9dc07

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
libgsmfr2: integrate table.c from libgsm
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 14 Apr 2024 02:36:08 +0000
parents
children
comparison
equal deleted inserted replaced
271:d320a8fa3392 272:19db59c9dc07
1 /*
2 * This C source file has been adapted from TU-Berlin libgsm source,
3 * original notice follows:
4 *
5 * Copyright 1992 by Jutta Degener and Carsten Bormann, Technische
6 * Universitaet Berlin. See the accompanying file "COPYRIGHT" for
7 * details. THERE IS ABSOLUTELY NO WARRANTY FOR THIS SOFTWARE.
8 */
9
10 #include <stdint.h>
11 #include "tw_gsmfr.h"
12 #include "typedef.h"
13 #include "ed_state.h"
14 #include "ed_internal.h"
15
16 /* 4.4 TABLES USED IN THE FIXED POINT IMPLEMENTATION OF THE RPE-LTP
17 * CODER AND DECODER
18 *
19 * (Most of them inlined, so watch out.)
20 */
21
22 /* Table 4.1 Quantization of the Log.-Area Ratios
23 */
24 /* i 1 2 3 4 5 6 7 8 */
25 word gsm_A[8] = {20480, 20480, 20480, 20480, 13964, 15360, 8534, 9036};
26 word gsm_B[8] = { 0, 0, 2048, -2560, 94, -1792, -341, -1144};
27 word gsm_MIC[8] = { -32, -32, -16, -16, -8, -8, -4, -4 };
28 word gsm_MAC[8] = { 31, 31, 15, 15, 7, 7, 3, 3 };
29
30
31 /* Table 4.2 Tabulation of 1/A[1..8]
32 */
33 word gsm_INVA[8]={ 13107, 13107, 13107, 13107, 19223, 17476, 31454, 29708 };
34
35
36 /* Table 4.3a Decision level of the LTP gain quantizer
37 */
38 /* bc 0 1 2 3 */
39 word gsm_DLB[4] = { 6554, 16384, 26214, 32767 };
40
41
42 /* Table 4.3b Quantization levels of the LTP gain quantizer
43 */
44 /* bc 0 1 2 3 */
45 word gsm_QLB[4] = { 3277, 11469, 21299, 32767 };
46
47
48 /* Table 4.4 Coefficients of the weighting filter
49 */
50 /* i 0 1 2 3 4 5 6 7 8 9 10 */
51 word gsm_H[11] = {-134, -374, 0, 2054, 5741, 8192, 5741, 2054, 0, -374, -134 };
52
53
54 /* Table 4.5 Normalized inverse mantissa used to compute xM/xmax
55 */
56 /* i 0 1 2 3 4 5 6 7 */
57 word gsm_NRFAC[8] = { 29128, 26215, 23832, 21846, 20165, 18725, 17476, 16384 };
58
59
60 /* Table 4.6 Normalized direct mantissa used to compute xM/xmax
61 */
62 /* i 0 1 2 3 4 5 6 7 */
63 word gsm_FAC[8] = { 18431, 20479, 22527, 24575, 26623, 28671, 30719, 32767 };