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comparison libtwamr/d4_17pf.c @ 334:dfaa8f322a8d

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libtwamr: integrate d4_17pf.c
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 18 Apr 2024 22:30:03 +0000
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333:f4a5545ea8b2 334:dfaa8f322a8d
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 : d4_17pf.c
11 * Purpose : Algebraic codebook decoder
12 *
13 ********************************************************************************
14 */
15
16 /*
17 ********************************************************************************
18 * MODULE INCLUDE FILE AND VERSION ID
19 ********************************************************************************
20 */
21 #include "namespace.h"
22 #include "d4_17pf.h"
23
24 /*
25 ********************************************************************************
26 * INCLUDE FILES
27 ********************************************************************************
28 */
29 #include "typedef.h"
30 #include "basic_op.h"
31 #include "no_count.h"
32 #include "cnst.h"
33 #include "graytab.h"
34
35 /*
36 ********************************************************************************
37 * LOCAL VARIABLES AND TABLES
38 ********************************************************************************
39 */
40 #define NB_PULSE 4
41
42 /*
43 ********************************************************************************
44 * PUBLIC PROGRAM CODE
45 ********************************************************************************
46 */
47 /*************************************************************************
48 *
49 * FUNCTION: decod_ACELP()
50 *
51 * PURPOSE: Algebraic codebook decoder
52 *
53 *************************************************************************/
54
55 void decode_4i40_17bits(
56 Word16 sign, /* i : signs of 4 pulses. */
57 Word16 index, /* i : Positions of the 4 pulses. */
58 Word16 cod[] /* o : algebraic (fixed) codebook excitation */
59 )
60 {
61 Word16 i, j;
62 Word16 pos[NB_PULSE];
63
64 /* Decode the positions */
65
66 i = index & 7; logic16 ();
67 i = dgray[i]; move16 ();
68
69 pos[0] = add(i, shl(i, 2)); /* pos0 =i*5 */ move16 ();
70
71 index = shr(index, 3);
72 i = index & 7; logic16 ();
73 i = dgray[i]; move16 ();
74
75 i = add(i, shl(i, 2)); /* pos1 =i*5+1 */
76 pos[1] = add(i, 1); move16 ();
77
78 index = shr(index, 3);
79 i = index & 7; logic16 ();
80 i = dgray[i]; move16 ();
81
82 i = add(i, shl(i, 2)); /* pos2 =i*5+1 */
83 pos[2] = add(i, 2); move16 ();
84
85 index = shr(index, 3);
86 j = index & 1; logic16 ();
87 index = shr(index, 1);
88 i = index & 7; logic16 ();
89 i = dgray[i]; move16 ();
90
91 i = add(i, shl(i, 2)); /* pos3 =i*5+3+j */
92 i = add(i, 3);
93 pos[3] = add(i, j); move16 ();
94
95 /* decode the signs and build the codeword */
96
97 for (i = 0; i < L_SUBFR; i++) {
98 cod[i] = 0; move16 ();
99 }
100
101 for (j = 0; j < NB_PULSE; j++) {
102 i = sign & 1; logic16 ();
103 sign = shr(sign, 1);
104
105 test ();
106 if (i != 0) {
107 cod[pos[j]] = 8191; move16 ();
108 } else {
109 cod[pos[j]] = -8192; move16 ();
110 }
111 }
112
113 return;
114 }