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annotate libtwamr/dtx_enc.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_enc.h
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11 * Purpose : DTX mode computation of SID parameters
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12 *
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13 ********************************************************************************
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14 */
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15 #ifndef dtx_enc_h
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16 #define dtx_enc_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 "cnst.h"
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26 #include "q_plsf.h"
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27 #include "gc_pred.h"
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28 #include "dtx_common.h"
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29
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30 /*
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31 ********************************************************************************
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32 * DEFINITION OF DATA TYPES
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33 ********************************************************************************
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34 */
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35 typedef struct {
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36 Word16 lsp_hist[M * DTX_HIST_SIZE];
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37 Word16 log_en_hist[DTX_HIST_SIZE];
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38 Word16 hist_ptr;
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39 Word16 log_en_index;
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40 Word16 init_lsf_vq_index;
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41 Word16 lsp_index[3];
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42
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43 /* DTX handler stuff */
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44 Word16 dtxHangoverCount;
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45 Word16 decAnaElapsedCount;
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46
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47 } dtx_encState;
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48 /*
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49 ********************************************************************************
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50 * DECLARATION OF PROTOTYPES
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51 ********************************************************************************
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52 */
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53
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54 /*
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55 **************************************************************************
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56 *
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57 * Function : dtx_enc_reset
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58 * Purpose : Resets state memory
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59 * Returns : 0 on success
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60 *
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61 **************************************************************************
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62 */
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63 void dtx_enc_reset (dtx_encState *st);
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64
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65 /*
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66 **************************************************************************
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67 *
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68 * Function : dtx_enc
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69 * Purpose :
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70 * Description :
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71 *
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72 **************************************************************************
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73 */
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74 int dtx_enc(dtx_encState *st, /* i/o : State struct */
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75 Word16 computeSidFlag, /* i : compute SID */
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76 Q_plsfState *qSt, /* i/o : Qunatizer state struct */
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77 gc_predState* predState, /* i/o : State struct */
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78 Word16 **anap /* o : analysis parameters */
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79 );
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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 * Function : dtx_buffer
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85 * Purpose : handles the DTX buffer
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86 *
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87 **************************************************************************
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88 */
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89 int dtx_buffer(dtx_encState *st, /* i/o : State struct */
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90 Word16 lsp_new[], /* i : LSP vector */
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91 Word16 speech[] /* i : speech samples */
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92 );
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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 : tx_dtx_handler
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98 * Purpose : adds extra speech hangover to analyze speech on the decoding side.
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99 * Description : returns 1 when a new SID analysis may be made
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100 * otherwise it adds the appropriate hangover after a sequence
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101 * with out updates of SID parameters .
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102 *
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103 **************************************************************************
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104 */
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105 Word16 tx_dtx_handler(dtx_encState *st, /* i/o : State struct */
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106 Word16 vadFlag, /* i : vad control variable */
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107 enum Mode *usedMode /* o : mode changed or not */
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108 );
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109
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110 #endif