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comparison libtwamr/c2_9pf.h @ 320:ee64aabcc7a0

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libtwamr: integrate c2_9pf.c
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 18 Apr 2024 19:31:03 +0000
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319:9bca350be398 320:ee64aabcc7a0
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 : c2_9pf.h
11 * Purpose : Searches a 9 bit algebraic codebook containing
12 * 2 pulses in a frame of 40 samples.
13 *
14 *****************************************************************************
15 */
16 #ifndef c2_9pf_h
17 #define c2_9pf_h "$Id $"
18
19 /*
20 *****************************************************************************
21 * INCLUDE FILES
22 *****************************************************************************
23 */
24 #include "typedef.h"
25
26 /*
27 *****************************************************************************
28 * LOCAL VARIABLES AND TABLES
29 *****************************************************************************
30 */
31
32 /*
33 *****************************************************************************
34 * DEFINITION OF DATA TYPES
35 *****************************************************************************
36 */
37
38 /*
39 *****************************************************************************
40 * DECLARATION OF PROTOTYPES
41 *****************************************************************************
42 */
43 /*************************************************************************
44 *
45 * FUNCTION: code_2i40_9bits()
46 *
47 * PURPOSE: Searches a 9 bit algebraic codebook containing 2 pulses
48 * in a frame of 40 samples.
49 *
50 * DESCRIPTION:
51 * The code length is 40, containing 2 nonzero pulses: i0...i1.
52 * All pulses can have two possible amplitudes: +1 or -1.
53 * Pulse i0 can have 8 possible positions, pulse i1 can have
54 * 8 positions. Also coded is which track pair should be used,
55 * i.e. first or second pair. Where each pair contains 2 tracks.
56 *
57 * First subframe:
58 * first i0 : 0, 5, 10, 15, 20, 25, 30, 35.
59 * i1 : 2, 7, 12, 17, 22, 27, 32, 37.
60 * second i0 : 1, 6, 11, 16, 21, 26, 31, 36.
61 * i1 : 3, 8, 13, 18, 23, 28, 33, 38.
62 *
63 * Second subframe:
64 * first i0 : 0, 5, 10, 15, 20, 25, 30, 35.
65 * i1 : 3, 8, 13, 18, 23, 28, 33, 38.
66 * second i0 : 2, 7, 12, 17, 22, 27, 32, 37.
67 * i1 : 4, 9, 14, 19, 24, 29, 34, 39.
68 *
69 * Third subframe:
70 * first i0 : 0, 5, 10, 15, 20, 25, 30, 35.
71 * i1 : 2, 7, 12, 17, 22, 27, 32, 37.
72 * second i0 : 1, 6, 11, 16, 21, 26, 31, 36.
73 * i1 : 4, 9, 14, 19, 24, 29, 34, 39.
74 *
75 * Fourth subframe:
76 * first i0 : 0, 5, 10, 15, 20, 25, 30, 35.
77 * i1 : 3, 8, 13, 18, 23, 28, 33, 38.
78 * second i0 : 1, 6, 11, 16, 21, 26, 31, 36.
79 * i1 : 4, 9, 14, 19, 24, 29, 34, 39.
80 *
81 *************************************************************************/
82
83 Word16 code_2i40_9bits(
84 Word16 subNr, /* i : subframe number */
85 Word16 x[], /* i : target vector */
86 Word16 h[], /* i : impulse response of weighted synthesis filter */
87 /* h[-L_subfr..-1] must be set to zero. */
88 Word16 T0, /* i : Pitch lag */
89 Word16 pitch_sharp, /* i : Last quantized pitch gain */
90 Word16 code[], /* o : Innovative codebook */
91 Word16 y[], /* o : filtered fixed codebook excitation */
92 Word16 * sign /* o : Signs of 2 pulses */
93 );
94
95 #endif