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annotate libtwamr/gc_pred.h @ 585:3c6bf0d26ee7 default tip

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TW-TS-005 reader: fix maximum line length bug TW-TS-005 section 4.1 states: The maximum allowed length of each line is 80 characters, not including the OS-specific newline encoding. The implementation of this line length limit in the TW-TS-005 hex file reader function in the present suite was wrong, such that lines of the full maximum length could not be read. Fix it. Note that this bug affects comment lines too, not just actual RTP payloads. Neither Annex A nor Annex B features an RTP payload format that goes to the maximum of 40 bytes, but if a comment line goes to the maximum allowed length of 80 characters not including the terminating newline, the bug will be triggered, necessitating the present fix.
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 25 Feb 2025 07:49:28 +0000
parents 7f99b8ed30e5
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 : gc_pred.h
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11 * Purpose : codebook gain MA prediction
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12 *
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13 ********************************************************************************
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14 */
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15
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16 #ifndef gc_pred_h
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17 #define gc_pred_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
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27 /*
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28 ********************************************************************************
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29 * LOCAL VARIABLES AND TABLES
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30 ********************************************************************************
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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 * DEFINITION OF DATA TYPES
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36 ********************************************************************************
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37 */
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38 typedef struct {
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39 Word16 past_qua_en[4]; /* normal MA predictor memory, Q10 */
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40 /* (contains 20*log10(qua_err)) */
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41 Word16 past_qua_en_MR122[4]; /* MA predictor memory for MR122 mode, Q10 */
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42 /* (contains log2(qua_err)) */
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43 } gc_predState;
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44
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45 /*
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46 ********************************************************************************
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47 * DECLARATION OF PROTOTYPES
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48 ********************************************************************************
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49 */
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50
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51 void gc_pred_reset (gc_predState *st);
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52 /* reset of codebook gain MA predictor state (i.e. set state memory to zero)
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53 returns 0 on success
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54 */
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55
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56 void
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57 gc_pred_copy(
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58 gc_predState *st_src, /* i : State struct */
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59 gc_predState *st_dest /* o : State struct */
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60 );
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61
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62 /*************************************************************************
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63 *
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64 * FUNCTION: gc_pred()
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65 *
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66 * PURPOSE: MA prediction of the innovation energy
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67 * (in dB/(20*log10(2))) with mean removed).
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68 *
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69 *************************************************************************/
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70 void gc_pred(
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71 gc_predState *st, /* i/o: State struct */
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72 enum Mode mode, /* i : AMR mode */
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73 Word16 *code, /* i : innovative codebook vector (L_SUBFR) */
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74 /* MR122: Q12, other modes: Q13 */
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75 Word16 *exp_gcode0, /* o : exponent of predicted gain factor, Q0 */
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76 Word16 *frac_gcode0,/* o : fraction of predicted gain factor Q15 */
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77 Word16 *exp_en, /* o : exponent of innovation energy, Q0 */
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78 /* (only calculated for MR795) */
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79 Word16 *frac_en /* o : fraction of innovation energy, Q15 */
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80 /* (only calculated for MR795) */
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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 * FUNCTION: gc_pred_update()
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86 *
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87 * PURPOSE: update MA predictor with last quantized energy
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88 *
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89 *************************************************************************/
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90 void gc_pred_update(
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91 gc_predState *st, /* i/o: State struct */
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92 Word16 qua_ener_MR122, /* i : quantized energy for update, Q10 */
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93 /* (log2(qua_err)) */
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94 Word16 qua_ener /* i : quantized energy for update, Q10 */
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95 /* (20*log10(qua_err)) */
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96 );
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97
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98 /*************************************************************************
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99 *
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100 * FUNCTION: gc_pred_average_limited()
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101 *
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102 * PURPOSE: get average of MA predictor state values (with a lower limit)
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103 * [used in error concealment]
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104 *
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105 *************************************************************************/
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106 void gc_pred_average_limited(
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107 gc_predState *st, /* i: State struct */
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108 Word16 *ener_avg_MR122, /* o: averaged quantized energy, Q10 */
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109 /* (log2(qua_err)) */
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110 Word16 *ener_avg /* o: averaged quantized energy, Q10 */
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111 /* (20*log10(qua_err)) */
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112 );
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113
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114 #endif