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comparison libtwamr/c4_17pf.h @ 322:fc82b113977f

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libtwamr: integrate c4_17pf.c
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 18 Apr 2024 19:41:41 +0000
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321:5fc9a2d12048 322:fc82b113977f
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 : c4_17pf.h
11 * Purpose : Searches a 17 bit algebraic codebook containing 4 pulses
12 * in a frame of 40 samples.
13 *
14 ********************************************************************************
15 */
16 #ifndef c4_17pf_h
17 #define c4_17pf_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_4i40_17bits()
46 *
47 * PURPOSE: Searches a 17 bit algebraic codebook containing 4 pulses
48 * in a frame of 40 samples.
49 *
50 * DESCRIPTION:
51 * The code length is 40, containing 4 nonzero pulses: i0...i3.
52 * All pulses can have two possible amplitudes: +1 or -1.
53 * Pulse i0 to i2 can have 8 possible positions, pulse i3 can have
54 * 2x8=16 positions.
55 *
56 * i0 : 0, 5, 10, 15, 20, 25, 30, 35.
57 * i1 : 1, 6, 11, 16, 21, 26, 31, 36.
58 * i2 : 2, 7, 12, 17, 22, 27, 32, 37.
59 * i3 : 3, 8, 13, 18, 23, 28, 33, 38.
60 * 4, 9, 14, 19, 24, 29, 34, 39.
61 *
62 *************************************************************************/
63
64 Word16 code_4i40_17bits(
65 Word16 x[], /* (i) : target vector */
66 Word16 h[], /* (i) : impulse response of weighted synthesis filter */
67 /* h[-L_subfr..-1] must be set to zero. */
68 Word16 T0, /* (i) : Pitch lag */
69 Word16 pitch_sharp, /* (i) : Last quantized pitch gain */
70 Word16 code[], /* (o) : Innovative codebook */
71 Word16 y[], /* (o) : filtered fixed codebook excitation */
72 Word16 * sign /* (o) : Signs of 4 pulses */
73 );
74
75 #endif