/* | |
** Copyright 2003-2010, VisualOn, Inc. | |
** | |
** Licensed under the Apache License, Version 2.0 (the "License"); | |
** you may not use this file except in compliance with the License. | |
** You may obtain a copy of the License at | |
** | |
** http://www.apache.org/licenses/LICENSE-2.0 | |
** | |
** Unless required by applicable law or agreed to in writing, software | |
** distributed under the License is distributed on an "AS IS" BASIS, | |
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
** See the License for the specific language governing permissions and | |
** limitations under the License. | |
*/ | |
/*********************************************************************** | |
* File: scale.c * | |
* * | |
* Description: Scale signal to get maximum of dynamic * | |
* * | |
************************************************************************/ | |
#include "typedef.h" | |
#include "basic_op.h" | |
void Scale_sig( | |
Word16 x[], /* (i/o) : signal to scale */ | |
Word16 lg, /* (i) : size of x[] */ | |
Word16 exp /* (i) : exponent: x = round(x << exp) */ | |
) | |
{ | |
Word32 i; | |
Word32 L_tmp; | |
if(exp > 0) | |
{ | |
for (i = lg - 1 ; i >= 0; i--) | |
{ | |
L_tmp = L_shl2(x[i], 16 + exp); | |
x[i] = extract_h(L_add(L_tmp, 0x8000)); | |
} | |
} | |
else | |
{ | |
exp = -exp; | |
for (i = lg - 1; i >= 0; i--) | |
{ | |
L_tmp = x[i] << 16; | |
L_tmp >>= exp; | |
x[i] = (L_tmp + 0x8000)>>16; | |
} | |
} | |
return; | |
} | |