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annotate dev/xmaxc-tables.c @ 470:ea89eb8291bf

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libgsmefr: add RTP-encoded DHF const datum to public API
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 14 May 2024 07:13:59 +0000
parents 56d3fbacd115
children
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56d3fbacd115 dev: new program xmaxc-tables
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1 /*
56d3fbacd115 dev: new program xmaxc-tables
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2 * For libgsmfrp: if we are going to initiate comfort noise generation
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3 * upon receiving an invalid SID, and if we are going to harvest the
56d3fbacd115 dev: new program xmaxc-tables
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4 * needed LARc and Xmaxc parameters from the last speech frame, we'll
56d3fbacd115 dev: new program xmaxc-tables
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5 * need a way to compute a single mean Xmaxc from the 4 subframe Xmaxc
56d3fbacd115 dev: new program xmaxc-tables
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6 * parameters of that last speech frame.
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7 *
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8 * This program generates Xmaxc dequantization and requantization tables
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9 * that are specifically optimized for performing this mean manipulation.
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10 */
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11
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12 #include <stdio.h>
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13 #include <stdint.h>
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14 #include <stdlib.h>
56d3fbacd115 dev: new program xmaxc-tables
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15
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16 static uint16_t dequant_table[64];
56d3fbacd115 dev: new program xmaxc-tables
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17 static uint8_t requant_table[1024];
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18
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19 static void
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20 compute_dequant()
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21 {
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22 unsigned xmaxc, dequant, step;
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23
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24 dequant = 0;
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25 step = 1;
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26 for (xmaxc = 0; xmaxc < 64; xmaxc++) {
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27 dequant_table[xmaxc] = dequant;
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28 dequant += step;
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29 if ((xmaxc & 7) == 7 && xmaxc != 7)
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30 step <<= 1;
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31 }
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32 }
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33
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34 static void
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35 compute_requant()
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36 {
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37 unsigned x, c;
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38
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39 for (x = 0; x < 1024; x++) {
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40 for (c = 0; c < 63; c++) {
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41 if (x < dequant_table[c+1])
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42 break;
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43 }
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44 requant_table[x] = c;
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45 }
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46 }
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47
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48 static void
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49 print_dequant()
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50 {
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51 unsigned c, r;
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52
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53 puts("const uint16_t dequant_table[64] = {");
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54 for (c = 0; c < 64; c++) {
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55 r = c & 7;
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56 if (!r)
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57 putchar('\t');
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58 printf("%3u,", dequant_table[c]);
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59 if (r == 7)
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60 putchar('\n');
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61 else
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62 putchar(' ');
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63 }
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64 fputs("};\n\n", stdout);
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65 }
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66
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67 static void
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68 print_requant()
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69 {
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70 unsigned x, r;
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71
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72 puts("const uint8_t requant_table[1024] = {");
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73 for (x = 0; x < 1024; x++) {
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74 r = x & 15;
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75 if (!r)
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76 putchar('\t');
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77 printf("%2u,", requant_table[x]);
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78 if (r == 15)
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79 putchar('\n');
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80 else
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81 putchar(' ');
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82 }
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83 fputs("};\n", stdout);
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84 }
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85
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86 main(argc, argv)
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87 char **argv;
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88 {
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89 compute_dequant();
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90 compute_requant();
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91 print_dequant();
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92 print_requant();
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93 exit(0);
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94 }