mirror of
https://github.com/nyanmisaka/mpp.git
synced 2025-10-06 01:26:49 +08:00
5ab2877839
git-svn-id: https://10.10.10.66:8443/svn/MediaProcessPlatform/trunk/mpp@108 6e48237b-75ef-9749-8fc9-41990f28c85a
58 lines
1.6 KiB
C++
58 lines
1.6 KiB
C++
/*
|
|
* Copyright 2010 Rockchip Electronics S.LSI Co. LTD
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#include "mpp_common.h"
|
|
|
|
static const RK_U8 log2_tab[256]={
|
|
0,0,1,1,2,2,2,2,3,3,3,3,3,3,3,3,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
|
|
5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,
|
|
6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
|
|
6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
|
|
7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
|
|
7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
|
|
7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
|
|
7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7
|
|
};
|
|
|
|
RK_S32 mpp_log2(RK_U32 v)
|
|
{
|
|
RK_S32 n = 0;
|
|
if (v & 0xffff0000) {
|
|
v >>= 16;
|
|
n += 16;
|
|
}
|
|
if (v & 0xff00) {
|
|
v >>= 8;
|
|
n += 8;
|
|
}
|
|
n += log2_tab[v];
|
|
|
|
return n;
|
|
}
|
|
|
|
RK_S32 mpp_log2_16bit(RK_U32 v)
|
|
{
|
|
RK_S32 n = 0;
|
|
if (v & 0xff00) {
|
|
v >>= 8;
|
|
n += 8;
|
|
}
|
|
n += log2_tab[v];
|
|
|
|
return n;
|
|
}
|
|
|