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annotate libtwamr/dtx_dec.h @ 477:4c9222d95647

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libtwamr encoder: always emit frame->mode = mode; In the original implementation of amr_encode_frame(), the 'mode' member of the output struct was set to 0xFF if the output frame type is TX_NO_DATA. This design was made to mimic the mode field (16-bit word) being set to 0xFFFF (or -1) in 3GPP test sequence format - but nothing actually depends on this struct member being set in any way, and amr_frame_to_tseq() generates the needed 0xFFFF on its own, based on frame->type being equal to TX_NO_DATA. It is simpler and more efficient to always set frame->mode to the actual encoding mode in amr_encode_frame(), and this new behavior has already been documented in doc/AMR-library-API description in anticipation of the present change.
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 18 May 2024 22:30:42 +0000
parents 5a1d18542f8a
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 : dtx_dec.h
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11 * Purpose : Decode comfort noice when in DTX
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12 *
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13 *****************************************************************************
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14 */
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15 #ifndef dtx_dec_h
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16 #define dtx_dec_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 "tw_amr.h"
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24 #include "typedef.h"
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25 #include "dtx_common.h"
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26 #include "d_plsf.h"
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27 #include "gc_pred.h"
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28 #include "c_g_aver.h"
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29
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30 /*
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31 *****************************************************************************
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32 * LOCAL VARIABLES AND TABLES
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33 *****************************************************************************
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34 */
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35 enum DTXStateType {SPEECH = 0, DTX, DTX_MUTE};
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36
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37 #define DTX_MAX_EMPTY_THRESH 50
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38
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39 /*
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40 *****************************************************************************
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41 * DEFINITION OF DATA TYPES
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42 *****************************************************************************
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43 */
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44
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45 typedef struct {
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46 Word16 since_last_sid;
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47 Word16 true_sid_period_inv;
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48 Word16 log_en;
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49 Word16 old_log_en;
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50 Word32 L_pn_seed_rx;
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51 Word16 lsp[M];
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52 Word16 lsp_old[M];
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53
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54 Word16 lsf_hist[M*DTX_HIST_SIZE];
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55 Word16 lsf_hist_ptr;
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56 Word16 lsf_hist_mean[M*DTX_HIST_SIZE];
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57 Word16 log_pg_mean;
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58 Word16 log_en_hist[DTX_HIST_SIZE];
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59 Word16 log_en_hist_ptr;
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60
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61 Word16 log_en_adjust;
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62
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63 Word16 dtxHangoverCount;
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64 Word16 decAnaElapsedCount;
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65
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66 Word16 sid_frame;
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67 Word16 valid_data;
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68 Word16 dtxHangoverAdded;
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69
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70 enum DTXStateType dtxGlobalState; /* contains previous state */
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71 /* updated in main decoder */
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72
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73 Word16 data_updated; /* marker to know if CNI data is ever renewed */
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74
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75 } dtx_decState;
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76
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77 /*
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78 *****************************************************************************
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79 * DECLARATION OF PROTOTYPES
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80 *****************************************************************************
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81 */
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82
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83 /*
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84 **************************************************************************
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85 *
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86 * Function : dtx_dec_reset
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87 * Purpose : Resets state memory
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88 * Returns : 0 on success
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89 *
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90 **************************************************************************
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91 */
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92 void dtx_dec_reset (dtx_decState *st);
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93
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94 /*
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95 **************************************************************************
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96 *
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97 * Function : dtx_dec
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98 * Purpose :
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99 * Description :
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100 *
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101 **************************************************************************
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102 */
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103 int dtx_dec(
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104 dtx_decState *st, /* i/o : State struct */
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105 Word16 mem_syn[], /* i/o : AMR decoder state */
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106 D_plsfState* lsfState, /* i/o : decoder lsf states */
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107 gc_predState* predState, /* i/o : prediction states */
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108 Cb_gain_averageState* averState, /* i/o : CB gain average states */
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109 enum DTXStateType new_state, /* i : new DTX state */
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110 enum Mode mode, /* i : AMR mode */
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111 Word16 parm[], /* i : Vector of synthesis parameters */
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112 Word16 synth[], /* o : synthesised speech */
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113 Word16 A_t[] /* o : decoded LP filter in 4 subframes*/
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114 );
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115
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116 void dtx_dec_activity_update(dtx_decState *st,
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117 Word16 lsf[],
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118 Word16 frame[]);
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119
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120 /*
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121 **************************************************************************
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122 *
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123 * Function : rx_dtx_handler
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124 * Purpose : reads the frame type and checks history
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125 * Description : to decide what kind of DTX/CNI action to perform
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126
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127 **************************************************************************
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128 */
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129 enum DTXStateType rx_dtx_handler(dtx_decState *st, /* i/o : State struct */
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130 enum RXFrameType frame_type /* i : Frame type */
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131 );
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132
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133 #endif