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annotate libgsmfr2/table.c @ 485:751f06541fbb

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doc/Codec-utils: clarify lack of DHF in gsmfr-decode-rb
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 20 May 2024 01:47:22 +0000
parents 19db59c9dc07
children
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1 /*
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2 * This C source file has been adapted from TU-Berlin libgsm source,
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3 * original notice follows:
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4 *
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5 * Copyright 1992 by Jutta Degener and Carsten Bormann, Technische
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6 * Universitaet Berlin. See the accompanying file "COPYRIGHT" for
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7 * details. THERE IS ABSOLUTELY NO WARRANTY FOR THIS SOFTWARE.
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8 */
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9
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10 #include <stdint.h>
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11 #include "tw_gsmfr.h"
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12 #include "typedef.h"
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13 #include "ed_state.h"
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14 #include "ed_internal.h"
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15
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16 /* 4.4 TABLES USED IN THE FIXED POINT IMPLEMENTATION OF THE RPE-LTP
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17 * CODER AND DECODER
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18 *
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19 * (Most of them inlined, so watch out.)
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20 */
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21
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22 /* Table 4.1 Quantization of the Log.-Area Ratios
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23 */
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24 /* i 1 2 3 4 5 6 7 8 */
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25 word gsm_A[8] = {20480, 20480, 20480, 20480, 13964, 15360, 8534, 9036};
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26 word gsm_B[8] = { 0, 0, 2048, -2560, 94, -1792, -341, -1144};
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27 word gsm_MIC[8] = { -32, -32, -16, -16, -8, -8, -4, -4 };
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28 word gsm_MAC[8] = { 31, 31, 15, 15, 7, 7, 3, 3 };
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31 /* Table 4.2 Tabulation of 1/A[1..8]
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32 */
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33 word gsm_INVA[8]={ 13107, 13107, 13107, 13107, 19223, 17476, 31454, 29708 };
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35
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36 /* Table 4.3a Decision level of the LTP gain quantizer
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37 */
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38 /* bc 0 1 2 3 */
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39 word gsm_DLB[4] = { 6554, 16384, 26214, 32767 };
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41
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42 /* Table 4.3b Quantization levels of the LTP gain quantizer
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43 */
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44 /* bc 0 1 2 3 */
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45 word gsm_QLB[4] = { 3277, 11469, 21299, 32767 };
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48 /* Table 4.4 Coefficients of the weighting filter
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49 */
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50 /* i 0 1 2 3 4 5 6 7 8 9 10 */
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51 word gsm_H[11] = {-134, -374, 0, 2054, 5741, 8192, 5741, 2054, 0, -374, -134 };
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53
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54 /* Table 4.5 Normalized inverse mantissa used to compute xM/xmax
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55 */
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56 /* i 0 1 2 3 4 5 6 7 */
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57 word gsm_NRFAC[8] = { 29128, 26215, 23832, 21846, 20165, 18725, 17476, 16384 };
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59
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60 /* Table 4.6 Normalized direct mantissa used to compute xM/xmax
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61 */
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62 /* i 0 1 2 3 4 5 6 7 */
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63 word gsm_FAC[8] = { 18431, 20479, 22527, 24575, 26623, 28671, 30719, 32767 };