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annotate libgsmefr/frame2params.c @ 254:f931e704adc5

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libtwamr: bits and parameter packing
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 05 Apr 2024 07:41:31 +0000
parents 4ae1dd43e332
children
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34
69b9cbca075b libgsmefr: implement frame unpacking
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1 /*
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2 * In this module we implement our EFR_frame2params() unpacking function.
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3 */
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4
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5 #include "gsm_efr.h"
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6
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7 void EFR_frame2params(const uint8_t *frame, int16_t *params)
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8 {
45
4ae1dd43e332 libgsmefr/frame2params.c: brown paper bag
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9 const uint8_t *c = frame;
34
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10
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11 /* EFR_MAGIC = (*c >> 4) & 0xF; */
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12 params[0] = (*c++ & 0xF) << 3;
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13 params[0] |= (*c >> 5) & 0x7;
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14 params[1] = (*c++ & 0x1F) << 3;
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15 params[1] |= (*c >> 5) & 0x7;
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16 params[2] = (*c++ & 0x1F) << 4;
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17 params[2] |= (*c >> 4) & 0xF;
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18 params[3] = (*c++ & 0xF) << 4;
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19 params[3] |= (*c >> 4) & 0xF;
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20 params[4] = (*c++ & 0xF) << 2;
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21 params[4] |= (*c >> 6) & 0x3;
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22 params[5] = (*c++ & 0x3F) << 3;
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23 params[5] |= (*c >> 5) & 0x7;
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24 params[6] = (*c >> 1) & 0xF;
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25 params[7] = (*c++ & 0x1) << 3;
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26 params[7] |= (*c >> 5) & 0x7;
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27 params[8] = (*c >> 1) & 0xF;
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28 params[9] = (*c++ & 0x1) << 3;
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29 params[9] |= (*c >> 5) & 0x7;
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30 params[10] = (*c >> 1) & 0xF;
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31 params[11] = (*c++ & 0x1) << 3;
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32 params[11] |= (*c >> 5) & 0x7;
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33 params[12] = (*c >> 2) & 0x7;
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34 params[13] = (*c++ & 0x3) << 1;
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35 params[13] |= (*c >> 7) & 0x1;
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36 params[14] = (*c >> 4) & 0x7;
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37 params[15] = (*c >> 1) & 0x7;
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38 params[16] = (*c++ & 0x1) << 2;
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39 params[16] |= (*c >> 6) & 0x3;
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40 params[17] = (*c >> 1) & 0x1F;
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41 params[18] = (*c++ & 0x1) << 5;
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42 params[18] |= (*c >> 3) & 0x1F;
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43 params[19] = (*c++ & 0x7) << 1;
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44 params[19] |= (*c >> 7) & 0x1;
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45 params[20] = (*c >> 3) & 0xF;
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46 params[21] = (*c++ & 0x7) << 1;
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47 params[21] |= (*c >> 7) & 0x1;
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48 params[22] = (*c >> 3) & 0xF;
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49 params[23] = (*c++ & 0x7) << 1;
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50 params[23] |= (*c >> 7) & 0x1;
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51 params[24] = (*c >> 3) & 0xF;
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52 params[25] = *c++ & 0x7;
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53 params[26] = (*c >> 5) & 0x7;
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54 params[27] = (*c >> 2) & 0x7;
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55 params[28] = (*c++ & 0x3) << 1;
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56 params[28] |= (*c >> 7) & 0x1;
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57 params[29] = (*c >> 4) & 0x7;
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58 params[30] = (*c++ & 0xF) << 1;
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59 params[30] |= (*c >> 7) & 0x1;
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60 params[31] = (*c++ & 0x7F) << 2;
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61 params[31] |= (*c >> 6) & 0x3;
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62 params[32] = (*c >> 2) & 0xF;
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63 params[33] = (*c++ & 0x3) << 2;
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64 params[33] |= (*c >> 6) & 0x3;
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65 params[34] = (*c >> 2) & 0xF;
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66 params[35] = (*c++ & 0x3) << 2;
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67 params[35] |= (*c >> 6) & 0x3;
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68 params[36] = (*c >> 2) & 0xF;
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69 params[37] = (*c++ & 0x3) << 2;
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70 params[37] |= (*c >> 6) & 0x3;
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71 params[38] = (*c >> 3) & 0x7;
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72 params[39] = *c++ & 0x7;
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73 params[40] = (*c >> 5) & 0x7;
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74 params[41] = (*c >> 2) & 0x7;
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75 params[42] = (*c++ & 0x3) << 1;
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76 params[42] |= (*c >> 7) & 0x1;
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77 params[43] = (*c >> 2) & 0x1F;
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78 params[44] = (*c++ & 0x3) << 4;
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79 params[44] |= (*c >> 4) & 0xF;
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80 params[45] = *c++ & 0xF;
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81 params[46] = (*c >> 4) & 0xF;
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82 params[47] = *c++ & 0xF;
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83 params[48] = (*c >> 4) & 0xF;
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84 params[49] = *c++ & 0xF;
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85 params[50] = (*c >> 4) & 0xF;
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86 params[51] = (*c >> 1) & 0x7;
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87 params[52] = (*c++ & 0x1) << 2;
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88 params[52] |= (*c >> 6) & 0x3;
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89 params[53] = (*c >> 3) & 0x7;
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90 params[54] = *c++ & 0x7;
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91 params[55] = (*c >> 5) & 0x7;
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92 params[56] = *c++ & 0x1F;
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93 }