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annotate libtwamr/d_plsf.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 3f574255c3aa
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 : d_plsf.h
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11 * Purpose : common part (init, exit, reset) of LSF decoder
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12 * module (rest in d_plsf_3.c and d_plsf_5.c)
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13 *
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14 ********************************************************************************
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15 */
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16 #ifndef d_plsf_h
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17 #define d_plsf_h "$Id $"
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18
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19 /*
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20 ********************************************************************************
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21 * INCLUDE FILES
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22 ********************************************************************************
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23 */
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24 #include "tw_amr.h"
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25 #include "typedef.h"
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26 #include "cnst.h"
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27
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28 /*
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29 ********************************************************************************
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30 * LOCAL VARIABLES AND TABLES
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31 ********************************************************************************
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32 */
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33 /*
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34 *--------------------------------------------------*
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35 * Constants (defined in cnst.h) *
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36 *--------------------------------------------------*
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37 * M : LPC Order *
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38 *--------------------------------------------------*
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39 */
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40
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41 /*
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42 ********************************************************************************
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43 * DEFINITION OF DATA TYPES
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44 ********************************************************************************
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45 */
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46 typedef struct {
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47 Word16 past_r_q[M]; /* Past quantized prediction error, Q15 */
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48 Word16 past_lsf_q[M]; /* Past dequantized lsfs, Q15 */
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49 } D_plsfState;
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50
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51 /*
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52 ********************************************************************************
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53 * DECLARATION OF PROTOTYPES
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54 ********************************************************************************
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55 */
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56
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57 /*
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58 **************************************************************************
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59 *
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60 * Function : D_plsf_reset
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61 * Purpose : Resets state memory
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62 * Returns : 0 on success
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63 *
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64 **************************************************************************
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65 */
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66 void D_plsf_reset (D_plsfState *st);
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67
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68 /*
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69 **************************************************************************
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70 *
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71 * Function : D_plsf_5
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72 * Purpose : Decodes the 2 sets of LSP parameters in a frame
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73 * using the received quantization indices.
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74 * Description : The two sets of LSFs are quantized using split by
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75 * 5 matrix quantization (split-MQ) with 1st order MA
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76 * prediction.
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77 * See "q_plsf_5.c" for more details about the
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78 * quantization procedure
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79 * Returns : 0
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80 *
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81 **************************************************************************
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82 */
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83 int D_plsf_5 (
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84 D_plsfState *st, /* i/o: State variables */
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85 Word16 bfi, /* i : bad frame indicator (set to 1 if a bad
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86 frame is received) */
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87 Word16 *indice, /* i : quantization indices of 5 submatrices, Q0 */
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88 Word16 *lsp1_q, /* o : quantized 1st LSP vector (M) Q15 */
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89 Word16 *lsp2_q /* o : quantized 2nd LSP vector (M) Q15 */
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90 );
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91
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92 /*************************************************************************
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93 *
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94 * FUNCTION: D_plsf_3()
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95 *
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96 * PURPOSE: Decodes the LSP parameters using the received quantization
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97 * indices.1st order MA prediction and split by 3 matrix
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98 * quantization (split-MQ)
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99 *
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100 *************************************************************************/
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101
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102 void D_plsf_3(
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103 D_plsfState *st, /* i/o: State struct */
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104 enum Mode mode, /* i : coder mode */
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105 Word16 bfi, /* i : bad frame indicator (set to 1 if a */
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106 /* bad frame is received) */
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107 Word16 * indice, /* i : quantization indices of 3 submatrices, Q0 */
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108 Word16 * lsp1_q /* o : quantized 1st LSP vector, Q15 */
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109 );
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110
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111 /*************************************************************************
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112 *
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113 * FUNCTION: Init_D_plsf_3()
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114 *
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115 * PURPOSE: Set the past_r_q[M] vector to one of the eight
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116 * past_rq_init vectors.
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117 *
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118 *************************************************************************/
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119 void Init_D_plsf_3(D_plsfState *st, /* i/o: State struct */
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120 Word16 index /* i : past_rq_init[] index [0, 7] */
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121 );
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122
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123 #endif