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comparison libtwamr/gc_pred.h @ 336:7f99b8ed30e5

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libtwamr: integrate gc_pred.c
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 18 Apr 2024 23:02:35 +0000
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335:03198f6b0427 336:7f99b8ed30e5
1 /*
2 ********************************************************************************
3 *
4 * GSM AMR-NB speech codec R98 Version 7.6.0 December 12, 2001
5 * R99 Version 3.3.0
6 * REL-4 Version 4.1.0
7 *
8 ********************************************************************************
9 *
10 * File : gc_pred.h
11 * Purpose : codebook gain MA prediction
12 *
13 ********************************************************************************
14 */
15
16 #ifndef gc_pred_h
17 #define gc_pred_h "$Id $"
18
19 /*
20 ********************************************************************************
21 * INCLUDE FILES
22 ********************************************************************************
23 */
24 #include "tw_amr.h"
25 #include "typedef.h"
26
27 /*
28 ********************************************************************************
29 * LOCAL VARIABLES AND TABLES
30 ********************************************************************************
31 */
32
33 /*
34 ********************************************************************************
35 * DEFINITION OF DATA TYPES
36 ********************************************************************************
37 */
38 typedef struct {
39 Word16 past_qua_en[4]; /* normal MA predictor memory, Q10 */
40 /* (contains 20*log10(qua_err)) */
41 Word16 past_qua_en_MR122[4]; /* MA predictor memory for MR122 mode, Q10 */
42 /* (contains log2(qua_err)) */
43 } gc_predState;
44
45 /*
46 ********************************************************************************
47 * DECLARATION OF PROTOTYPES
48 ********************************************************************************
49 */
50
51 void gc_pred_reset (gc_predState *st);
52 /* reset of codebook gain MA predictor state (i.e. set state memory to zero)
53 returns 0 on success
54 */
55
56 void
57 gc_pred_copy(
58 gc_predState *st_src, /* i : State struct */
59 gc_predState *st_dest /* o : State struct */
60 );
61
62 /*************************************************************************
63 *
64 * FUNCTION: gc_pred()
65 *
66 * PURPOSE: MA prediction of the innovation energy
67 * (in dB/(20*log10(2))) with mean removed).
68 *
69 *************************************************************************/
70 void gc_pred(
71 gc_predState *st, /* i/o: State struct */
72 enum Mode mode, /* i : AMR mode */
73 Word16 *code, /* i : innovative codebook vector (L_SUBFR) */
74 /* MR122: Q12, other modes: Q13 */
75 Word16 *exp_gcode0, /* o : exponent of predicted gain factor, Q0 */
76 Word16 *frac_gcode0,/* o : fraction of predicted gain factor Q15 */
77 Word16 *exp_en, /* o : exponent of innovation energy, Q0 */
78 /* (only calculated for MR795) */
79 Word16 *frac_en /* o : fraction of innovation energy, Q15 */
80 /* (only calculated for MR795) */
81 );
82
83 /*************************************************************************
84 *
85 * FUNCTION: gc_pred_update()
86 *
87 * PURPOSE: update MA predictor with last quantized energy
88 *
89 *************************************************************************/
90 void gc_pred_update(
91 gc_predState *st, /* i/o: State struct */
92 Word16 qua_ener_MR122, /* i : quantized energy for update, Q10 */
93 /* (log2(qua_err)) */
94 Word16 qua_ener /* i : quantized energy for update, Q10 */
95 /* (20*log10(qua_err)) */
96 );
97
98 /*************************************************************************
99 *
100 * FUNCTION: gc_pred_average_limited()
101 *
102 * PURPOSE: get average of MA predictor state values (with a lower limit)
103 * [used in error concealment]
104 *
105 *************************************************************************/
106 void gc_pred_average_limited(
107 gc_predState *st, /* i: State struct */
108 Word16 *ener_avg_MR122, /* o: averaged quantized energy, Q10 */
109 /* (log2(qua_err)) */
110 Word16 *ener_avg /* o: averaged quantized energy, Q10 */
111 /* (20*log10(qua_err)) */
112 );
113
114 #endif