1/*
2 ** Copyright 2003-2010, VisualOn, Inc.
3 **
4 ** Licensed under the Apache License, Version 2.0 (the "License");
5 ** you may not use this file except in compliance with the License.
6 ** You may obtain a copy of the License at
7 **
8 **     http://www.apache.org/licenses/LICENSE-2.0
9 **
10 ** Unless required by applicable law or agreed to in writing, software
11 ** distributed under the License is distributed on an "AS IS" BASIS,
12 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 ** See the License for the specific language governing permissions and
14 ** limitations under the License.
15 */
16
17/***************************************************************************
18*      File: qisf_ns.c                                                     *
19*                                                                          *
20*      Description: Coding/Decoding of ISF parameters for background noise.*
21*                    The ISF vector is quantized using VQ with split-by-5  *
22*                                                                          *
23****************************************************************************/
24
25#include "typedef.h"
26#include "basic_op.h"
27#include "acelp.h"
28#include "qisf_ns.tab"                     /* Codebooks of ISFs */
29
30/*------------------------------------------------------------------*
31* routine:   Qisf_ns()                                             *
32*            ~~~~~~~~~                                             *
33*------------------------------------------------------------------*/
34
35void Qisf_ns(
36		Word16 * isf1,                        /* input : ISF in the frequency domain (0..0.5) */
37		Word16 * isf_q,                       /* output: quantized ISF                        */
38		Word16 * indice                       /* output: quantization indices                 */
39	    )
40{
41	Word16 i;
42	Word32 tmp;
43
44	for (i = 0; i < ORDER; i++)
45	{
46		isf_q[i] = sub(isf1[i], mean_isf_noise[i]);
47	}
48
49	indice[0] = Sub_VQ(&isf_q[0], dico1_isf_noise, 2, SIZE_BK_NOISE1, &tmp);
50	indice[1] = Sub_VQ(&isf_q[2], dico2_isf_noise, 3, SIZE_BK_NOISE2, &tmp);
51	indice[2] = Sub_VQ(&isf_q[5], dico3_isf_noise, 3, SIZE_BK_NOISE3, &tmp);
52	indice[3] = Sub_VQ(&isf_q[8], dico4_isf_noise, 4, SIZE_BK_NOISE4, &tmp);
53	indice[4] = Sub_VQ(&isf_q[12], dico5_isf_noise, 4, SIZE_BK_NOISE5, &tmp);
54
55	/* decoding the ISFs */
56
57	Disf_ns(indice, isf_q);
58
59	return;
60}
61
62/********************************************************************
63* Function:   Disf_ns()                                             *
64*            ~~~~~~~~~                                              *
65* Decoding of ISF parameters                                        *
66*-------------------------------------------------------------------*
67*  Arguments:                                                       *
68*    indice[] : indices of the selected codebook entries            *
69*    isf[]    : quantized ISFs (in frequency domain)                *
70*********************************************************************/
71
72void Disf_ns(
73		Word16 * indice,                      /* input:  quantization indices                  */
74		Word16 * isf_q                        /* input : ISF in the frequency domain (0..0.5)  */
75	    )
76{
77	Word16 i;
78
79	for (i = 0; i < 2; i++)
80	{
81		isf_q[i] = dico1_isf_noise[indice[0] * 2 + i];
82	}
83	for (i = 0; i < 3; i++)
84	{
85		isf_q[i + 2] = dico2_isf_noise[indice[1] * 3 + i];
86	}
87	for (i = 0; i < 3; i++)
88	{
89		isf_q[i + 5] = dico3_isf_noise[indice[2] * 3 + i];
90	}
91	for (i = 0; i < 4; i++)
92	{
93		isf_q[i + 8] = dico4_isf_noise[indice[3] * 4 + i];
94	}
95	for (i = 0; i < 4; i++)
96	{
97		isf_q[i + 12] = dico5_isf_noise[indice[4] * 4 + i];
98	}
99
100	for (i = 0; i < ORDER; i++)
101	{
102		isf_q[i] = add(isf_q[i], mean_isf_noise[i]);
103	}
104
105	Reorder_isf(isf_q, ISF_GAP, ORDER);
106
107	return;
108}
109
110
111
112