FreeCalypso > hg > gsm-codec-lib

annotate libgsmhr1/paramval_common.c @ 512:4f0ab833bec0

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libgsmhr1: add parameter validation function
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 25 Aug 2024 18:42:27 +0000
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512
4f0ab833bec0 libgsmhr1: add parameter validation function
Mychaela Falconia <falcon@freecalypso.org>
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1 /*
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2 * The function implemented in this module examines an array of 18 codec
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3 * parameters in the int16_t representation used in this library, and checks
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4 * if the unused upper bits of each int16_t word are cleared as they should be.
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5 * This function, or higher-level wrappers around it, should be used when
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6 * reading from ETSI-format *.cod and *.dec files, to guard against reading
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7 * garbage or wrong endian.
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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_gsmhr.h"
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12
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13 int gsmhr_check_common_params(const int16_t *params)
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14 {
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15 /* common parameters for all modes */
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16 if (params[0] & 0xFFE0)
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17 return -1;
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18 if (params[1] & 0xF800)
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19 return -1;
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20 if (params[2] & 0xFE00)
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21 return -1;
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22 if (params[3] & 0xFF00)
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23 return -1;
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24 if (params[4] & 0xFFFE)
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25 return -1;
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26 if (params[5] & 0xFFFC)
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27 return -1;
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28 if (params[5]) {
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29 /* voiced modes */
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30 /* subframe 1 */
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31 if (params[6] & 0xFF00)
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32 return -1;
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33 if (params[7] & 0xFE00)
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34 return -1;
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35 if (params[8] & 0xFFE0)
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36 return -1;
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37 /* subframe 2 */
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38 if (params[9] & 0xFFF0)
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39 return -1;
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40 if (params[10] & 0xFE00)
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41 return -1;
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42 if (params[11] & 0xFFE0)
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43 return -1;
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44 /* subframe 3 */
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45 if (params[12] & 0xFFF0)
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46 return -1;
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47 if (params[13] & 0xFE00)
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48 return -1;
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49 if (params[14] & 0xFFE0)
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50 return -1;
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51 /* subframe 4 */
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52 if (params[15] & 0xFFF0)
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53 return -1;
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54 if (params[16] & 0xFE00)
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55 return -1;
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56 if (params[17] & 0xFFE0)
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57 return -1;
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58 } else {
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59 /* unvoiced mode */
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60 /* subframe 1 */
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61 if (params[6] & 0xFF80)
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62 return -1;
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63 if (params[7] & 0xFF80)
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64 return -1;
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65 if (params[8] & 0xFFE0)
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66 return -1;
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67 /* subframe 2 */
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68 if (params[9] & 0xFF80)
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69 return -1;
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70 if (params[10] & 0xFF80)
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71 return -1;
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72 if (params[11] & 0xFFE0)
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73 return -1;
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74 /* subframe 3 */
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75 if (params[12] & 0xFF80)
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76 return -1;
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77 if (params[13] & 0xFF80)
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78 return -1;
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79 if (params[14] & 0xFFE0)
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80 return -1;
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81 /* subframe 4 */
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82 if (params[15] & 0xFF80)
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83 return -1;
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84 if (params[16] & 0xFF80)
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85 return -1;
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86 if (params[17] & 0xFFE0)
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87 return -1;
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88 }
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89 return 0;
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90 }