| /* |
| * Copyright (C) 2004-2010 NXP Software |
| * Copyright (C) 2010 The Android Open Source Project |
| * |
| * 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 FILES |
| ***********************************************************************************/ |
| |
| #include "LVM_Types.h" |
| #include "LVM_Macros.h" |
| #include "VectorArithmetic.h" |
| |
| /********************************************************************************** |
| FUNCTION DelayAllPass_32x32 |
| ***********************************************************************************/ |
| |
| void DelayAllPass_Sat_32x16To32( LVM_INT32 *delay, /* Delay buffer */ |
| LVM_UINT16 size, /* Delay size */ |
| LVM_INT16 coeff, /* All pass filter coefficient */ |
| LVM_UINT16 DelayOffset, /* Simple delay offset */ |
| LVM_UINT16 *pAllPassOffset, /* All pass filter delay offset */ |
| LVM_INT32 *dst, /* Source/destination */ |
| LVM_INT16 n) /* Number of samples */ |
| { |
| LVM_INT16 i; |
| LVM_UINT16 AllPassOffset = *pAllPassOffset; |
| LVM_INT32 temp; |
| LVM_INT32 a,b,c; |
| |
| for (i = 0; i < n; i++) |
| { |
| |
| MUL32x16INTO32(delay[AllPassOffset], coeff, temp, 15) |
| a = temp; |
| b = delay[DelayOffset]; |
| DelayOffset++; |
| |
| c = a + b; |
| if ((((c ^ a) & (c ^ b)) >> 31) != 0) /* overflow / underflow */ |
| { |
| if(a < 0) |
| { |
| c = 0x80000000l; |
| } |
| else |
| { |
| c = 0x7FFFFFFFl; |
| } |
| } |
| *dst = c; |
| dst++; |
| |
| |
| MUL32x16INTO32(c, -coeff, temp, 15) |
| a = temp; |
| b = delay[AllPassOffset]; |
| c = a + b; |
| if ((((c ^ a) & (c ^ b)) >> 31)!=0) /* overflow / underflow */ |
| { |
| if(a < 0) |
| { |
| c = 0x80000000l; |
| } |
| else |
| { |
| c = 0x7FFFFFFFl; |
| } |
| } |
| delay[AllPassOffset] = c; |
| AllPassOffset++; |
| |
| /* Make the delay buffer a circular buffer */ |
| if (DelayOffset >= size) |
| { |
| DelayOffset = 0; |
| } |
| |
| if (AllPassOffset >= size) |
| { |
| AllPassOffset = 0; |
| } |
| } |
| |
| /* Update the offset */ |
| *pAllPassOffset = AllPassOffset; |
| |
| return; |
| } |
| |
| /**********************************************************************************/ |
| |