FreeCalypso > hg > gsm-codec-lib
annotate dev/xmaxc-tables.c @ 394:2af94ba0c075
libtwamr: integrate syn_filt.c
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Mon, 06 May 2024 18:49:17 +0000 |
parents | 56d3fbacd115 |
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1 /* |
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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 |
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4 * needed LARc and Xmaxc parameters from the last speech frame, we'll |
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5 * need a way to compute a single mean Xmaxc from the 4 subframe Xmaxc |
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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> |
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15 |
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16 static uint16_t dequant_table[64]; |
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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 } |