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comparison libtwamr/d3_14pf.c @ 333:f4a5545ea8b2

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libtwamr: integrate d3_14pf.c
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 18 Apr 2024 22:23:42 +0000
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332:2303ba1490dd 333:f4a5545ea8b2
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 : d3_14pf.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 "d3_14pf.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
34 /*
35 ********************************************************************************
36 * LOCAL VARIABLES AND TABLES
37 ********************************************************************************
38 */
39 #define NB_PULSE 3 /* number of pulses */
40
41 /*
42 ********************************************************************************
43 * PUBLIC PROGRAM CODE
44 ********************************************************************************
45 */
46 /*************************************************************************
47 *
48 * FUNCTION: decode_3i40_14bits (decod_ACELP())
49 *
50 * PURPOSE: Algebraic codebook decoder
51 *
52 *************************************************************************/
53
54 void decode_3i40_14bits(
55 Word16 sign, /* i : signs of 3 pulses. */
56 Word16 index, /* i : Positions of the 3 pulses. */
57 Word16 cod[] /* o : algebraic (fixed) codebook excitation */
58 )
59 {
60 Word16 i, j;
61 Word16 pos[NB_PULSE];
62
63 /* Decode the positions */
64
65 i = index & 7; logic16 ();
66
67 pos[0] = add(i, shl(i, 2)); /* pos0 =i*5 */ move16 ();
68
69 index = shr(index, 3);
70 j = index & 1; logic16 ();
71 index = shr(index, 1);
72 i = index & 7; logic16 ();
73
74 i = add(i, shl(i, 2)); /* pos1 =i*5+1+j*2 */
75 i = add(i, 1);
76 j = shl(j, 1);
77 pos[1] = add(i, j); move16 ();
78
79 index = shr(index, 3);
80 j = index & 1; logic16 ();
81 index = shr(index, 1);
82 i = index & 7; logic16 ();
83
84 i = add(i, shl(i, 2)); /* pos2 =i*5+2+j*2 */
85 i = add(i, 2);
86 j = shl(j, 1);
87 pos[2] = add(i, j); move16 ();
88
89 /* decode the signs and build the codeword */
90
91 for (i = 0; i < L_SUBFR; i++) {
92 cod[i] = 0; move16 ();
93 }
94
95 for (j = 0; j < NB_PULSE; j++) {
96 i = sign & 1; logic16 ();
97 sign = shr(sign, 1);
98
99 test ();
100 if (i > 0) {
101 cod[pos[j]] = 8191; move16 (); /* +1.0 */
102 } else {
103 cod[pos[j]] = -8192; move16 (); /* -1.0 */
104 }
105 }
106
107 return;
108 }