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annotate libtwamr/b_cn_cod.h @ 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 07f936338de1
children
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1 /*
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2 ********************************************************************************
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3 *
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4 * GSM AMR-NB speech codec R98 Version 7.6.0 December 12, 2001
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5 * R99 Version 3.3.0
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6 * REL-4 Version 4.1.0
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7 *
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8 ********************************************************************************
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9 *
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10 * File : b_cn_cod.h
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11 * Purpose : Contains function for comfort noise generation.
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12 *
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13 ********************************************************************************
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14 */
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15 #ifndef b_cn_cod_h
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16 #define b_cn_cod_h "$Id $"
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17
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18 /*
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19 ********************************************************************************
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20 * INCLUDE FILES
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21 ********************************************************************************
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22 */
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23 #include "typedef.h"
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24
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25 /*
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26 ********************************************************************************
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27 * DEFINITION OF DATA TYPES
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28 ********************************************************************************
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29 */
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30
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31 /*
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32 ********************************************************************************
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33 * DECLARATION OF PROTOTYPES
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34 ********************************************************************************
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35 */
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36
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37 /*************************************************************************
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38 *
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39 * FUNCTION NAME: pseudonoise
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40 *
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41 * PURPOSE: Generate a random integer value to use in comfort noise
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42 * generation. The algorithm uses polynomial x^31 + x^3 + 1
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43 * (length of PN sequence is 2^31 - 1).
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44 *
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45 * INPUTS: *shift_reg Old CN generator shift register state
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46 *
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47 *
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48 * OUTPUTS: *shift_reg Updated CN generator shift register state
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49 *
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50 * RETURN VALUE: Generated random integer value
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51 *
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52 *************************************************************************/
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53
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54 Word16 pseudonoise (
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55 Word32 *shift_reg, /* i/o : Old CN generator shift register state */
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56 Word16 no_bits /* i : Number of bits */
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57 );
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58
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59 /*************************************************************************
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60 *
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61 * FUNCTION NAME: build_CN_code
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62 *
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63 * PURPOSE: Compute the comfort noise fixed codebook excitation. The
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64 * gains of the pulses are always +/-1.
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65 *
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66 * INPUTS: *seed Old CN generator shift register state
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67 *
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68 * OUTPUTS: cod[0..39] Generated comfort noise fixed codebook vector
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69 * *seed Updated CN generator shift register state
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70 *
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71 * RETURN VALUE: none
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72 *
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73 *************************************************************************/
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74 void build_CN_code (
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75 Word32 *seed, /* i/o : Old CN generator shift register state */
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76 Word16 cod[] /* o : Generated CN fixed codebook vector */
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77 );
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78
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79 /*************************************************************************
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80 *
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81 * FUNCTION NAME: build_CN_param
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82 *
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83 * PURPOSE: Randomize the speech parameters. So that they
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84 * do not produce tonal artifacts if used by ECU.
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85 *
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86 * INPUTS: *seed Old CN generator shift register state
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87 * n_param, Number of parameters to randomize
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88 * parm_size_table,
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89 *
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90 *
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91 * OUTPUTS: parm CN Generated Parameters
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92 * *seed Updated CN generator shift register state
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93 *
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94 * RETURN VALUE: none
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95 *
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96 *************************************************************************/
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97 void build_CN_param (
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98 Word16 *seed, /* i/o : Old CN generator shift register state */
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99 const Word16 n_param, /* i : number of params */
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100 const Word16 param_size_table[], /* i : size of params */
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101 Word16 parm[] /* o : CN Generated Params*/
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102 );
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103
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104 #endif