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| /*
| * Copyright 2015 Rockchip Electronics 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;
| }
|
| RK_S32 axb_div_c(RK_S32 a, RK_S32 b, RK_S32 c)
| {
| RK_U32 left = 32;
| RK_U32 right = 0;
| RK_U32 shift;
| RK_S32 sign = 1;
| RK_S32 tmp;
|
| if (a == 0 || b == 0)
| return 0;
| else if ((a * b / b) == a && c != 0)
| return (a * b / c);
|
| if (a < 0) {
| sign = -1;
| a = -a;
| }
| if (b < 0) {
| sign *= -1;
| b = -b;
| }
| if (c < 0) {
| sign *= -1;
| c = -c;
| }
|
| if (c == 0)
| return 0x7FFFFFFF * sign;
|
| if (b > a) {
| tmp = b;
| b = a;
| a = tmp;
| }
|
| for (--left; (((RK_U32)a << left) >> left) != (RK_U32)a; --left)
| ;
|
| left--;
|
| while (((RK_U32)b >> right) > (RK_U32)c)
| right++;
|
| if (right > left) {
| return 0x7FFFFFFF * sign;
| } else {
| shift = left - right;
| return (RK_S32)((((RK_U32)a << shift) /
| (RK_U32)c * (RK_U32)b) >> shift) * sign;
| }
| }
|
|
