First submission of audio effect library from NXP software.

This CL contains the first open sourceable version of the audio effect library from NXP software.
The effects implemented are:
- Bass boost
- Virtualizer (stereo widening)
- Equalizer
- Spectrum analyzer

Source file for the effect engines are located under libeffects/lvm/lib
The wrapper implementing the interface with the audio effect framework in under libeffects/lvm/wrapper

The code of other effect libraries has also been reorganized fo clarity:
- the effect factory is now under libeffects/factory
- the test equalizer and reverb effects are under libeffect/testlibs
- the visualizer is under libeffects/virtualizer

Change-Id: I8d91e2181f81b89f8fc0c1e1e6bf552c5809b2eb

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;
+}
+
+/**********************************************************************************/