diff options
Diffstat (limited to 'media/libeffects/lvm/lib/Common/src/DelayMix_16x16.c')
-rwxr-xr-x | media/libeffects/lvm/lib/Common/src/DelayMix_16x16.c | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/media/libeffects/lvm/lib/Common/src/DelayMix_16x16.c b/media/libeffects/lvm/lib/Common/src/DelayMix_16x16.c new file mode 100755 index 0000000..ee41701 --- /dev/null +++ b/media/libeffects/lvm/lib/Common/src/DelayMix_16x16.c @@ -0,0 +1,81 @@ +/* + * 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. + */ + +/********************************************************************************** + + $Author: beq07716 $ + $Revision: 1000 $ + $Date: 2010-06-28 13:08:20 +0200 (Mon, 28 Jun 2010) $ + +***********************************************************************************/ + +/********************************************************************************** + INCLUDE FILES +***********************************************************************************/ + +#include "VectorArithmetic.h" + +/********************************************************************************** + FUNCTION DelayMix_16x16 +***********************************************************************************/ + +void DelayMix_16x16(const LVM_INT16 *src, /* Source 1, to be delayed */ + LVM_INT16 *delay, /* Delay buffer */ + LVM_INT16 size, /* Delay size */ + LVM_INT16 *dst, /* Source/destination */ + LVM_INT16 *pOffset, /* Delay offset */ + LVM_INT16 n) /* Number of stereo samples */ +{ + LVM_INT16 i; + LVM_INT16 Offset = *pOffset; + LVM_INT16 temp; + + for (i=0; i<n; i++) + { + /* Left channel */ + temp = (LVM_INT16)((LVM_UINT32)((LVM_INT32)(*dst) + (LVM_INT32)delay[Offset]) >> 1); + *dst = temp; + dst++; + + delay[Offset] = *src; + Offset++; + src++; + + + /* Right channel */ + temp = (LVM_INT16)((LVM_UINT32)((LVM_INT32)(*dst) - (LVM_INT32)delay[Offset]) >> 1); + *dst = temp; + dst++; + + delay[Offset] = *src; + Offset++; + src++; + + /* Make the reverb delay buffer a circular buffer */ + if (Offset >= size) + { + Offset = 0; + } + } + + /* Update the offset */ + *pOffset = Offset; + + return; +} + +/**********************************************************************************/ |