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comparison src/prm2bits.c @ 0:56410792419a

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src: original EFR source from ETSI
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 03 Apr 2024 05:31:37 +0000
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-1:000000000000 0:56410792419a
1 /*************************************************************************
2 *
3 * FUNCTION: Prm2bits_12k2
4 *
5 * PURPOSE: converts the encoder parameter vector into a vector of serial
6 * bits.
7 *
8 * DESCRIPTION: The encoder parameters are:
9 *
10 * LPC:
11 * 1st codebook 7 bit
12 * 2nd codebook 8 bit
13 * 3rd codebook 8+1 bit
14 * 4th codebook 8 bit
15 * 5th codebook 6 bit
16 *
17 * 1st and 3rd subframes:
18 * pitch period 9 bit
19 * pitch gain 4 bit
20 * codebook index 35 bit
21 * codebook gain 5 bit
22 *
23 * 2nd and 4th subframes:
24 * pitch period 6 bit
25 * pitch gain 4 bit
26 * codebook index 35 bit
27 * codebook gain 5 bit
28 *
29 *************************************************************************/
30
31 #include "typedef.h"
32 #include "basic_op.h"
33 #include "count.h"
34
35 /* Local function */
36
37 void Int2bin (
38 Word16 value, /* input : value to be converted to binary */
39 Word16 no_of_bits, /* input : number of bits associated with value */
40 Word16 *bitstream /* output: address where bits are written */
41 );
42
43 #define BIT_0 0
44 #define BIT_1 1
45 #define MASK 0x0001
46 #define PRM_NO 57
47
48 void Prm2bits_12k2 (
49 Word16 prm[], /* input : analysis parameters (57 parameters) */
50 Word16 bits[] /* output: 244 serial bits */
51 )
52 {
53 Word16 i;
54
55 static const Word16 bitno[PRM_NO] =
56 {
57 7, 8, 9, 8, 6, /* LSP VQ */
58 9, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 5, /* first subframe */
59 6, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 5, /* second subframe */
60 9, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 5, /* third subframe */
61 6, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 5 /* fourth subframe */
62 };
63 for (i = 0; i < PRM_NO; i++)
64 {
65 Int2bin (prm[i], bitno[i], bits);
66 bits += bitno[i];
67 }
68
69 return;
70 }
71
72 /*************************************************************************
73 *
74 * FUNCTION: Int2bin
75 *
76 * PURPOSE: convert integer to binary and write the bits to the array
77 * bitstream[]. The most significant bits are written first.
78 *
79 *************************************************************************/
80
81 void Int2bin (
82 Word16 value, /* input : value to be converted to binary */
83 Word16 no_of_bits, /* input : number of bits associated with value */
84 Word16 *bitstream /* output: address where bits are written */
85 )
86 {
87 Word16 *pt_bitstream, i, bit;
88
89 pt_bitstream = &bitstream[no_of_bits]; move16 ();
90
91 for (i = 0; i < no_of_bits; i++)
92 {
93 bit = value & MASK; logic16 ();
94 test ();
95 if (bit == 0)
96 {
97 *--pt_bitstream = BIT_0; move16 ();
98 }
99 else
100 {
101 *--pt_bitstream = BIT_1; move16 ();
102 }
103 value = shr (value, 1);
104 }
105 }