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: scale.c                                                  *
19*                                                                      *
20*       Description: Scale signal to get maximum of dynamic            *
21*                                                                      *
22************************************************************************/
23
24#include "typedef.h"
25#include "basic_op.h"
26
27void Scale_sig(
28		Word16 x[],                           /* (i/o) : signal to scale               */
29		Word16 lg,                            /* (i)   : size of x[]                   */
30		Word16 exp                            /* (i)   : exponent: x = round(x << exp) */
31	      )
32{
33	Word32 i;
34	Word32 L_tmp;
35	if(exp > 0)
36	{
37		for (i = lg - 1 ; i >= 0; i--)
38		{
39			L_tmp = L_shl2(x[i], 16 + exp);
40			x[i] = extract_h(L_add(L_tmp, 0x8000));
41		}
42	}
43	else
44	{
45		exp = -exp;
46		for (i = lg - 1; i >= 0; i--)
47		{
48			L_tmp = x[i] << 16;
49			L_tmp >>= exp;
50			x[i] = (L_tmp + 0x8000)>>16;
51		}
52	}
53	return;
54}
55
56
57
58