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, 76 insertions, 0 deletions

diff --git a/media/libeffects/lvm/lib/Common/src/DC_2I_D16_TRC_WRA_01.c b/media/libeffects/lvm/lib/Common/src/DC_2I_D16_TRC_WRA_01.c
new file mode 100755
index 0000000..187fe68
--- /dev/null
+++ b/media/libeffects/lvm/lib/Common/src/DC_2I_D16_TRC_WRA_01.c
@@ -0,0 +1,76 @@
+/*
+ * 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.
+ */
+
+/************************************************************************/
+/*                                                                      */
+/*     Project::                                                        */
+/*     $Author: beq07716 $*/
+/*     $Revision: 1000 $*/
+/*     $Date: 2010-06-28 13:08:20 +0200 (Mon, 28 Jun 2010) $*/
+/*                                                                      */
+/************************************************************************/
+
+#include "BIQUAD.h"
+#include "DC_2I_D16_TRC_WRA_01_Private.h"
+#include "LVM_Macros.h"
+
+void DC_2I_D16_TRC_WRA_01( Biquad_Instance_t       *pInstance,
+                           LVM_INT16               *pDataIn,
+                           LVM_INT16               *pDataOut,
+                           LVM_INT16               NrSamples)
+    {
+        LVM_INT32 LeftDC,RightDC;
+        LVM_INT32 Diff;
+        LVM_INT32 j;
+        PFilter_State pBiquadState = (PFilter_State) pInstance;
+
+        LeftDC  =   pBiquadState->LeftDC;
+        RightDC =   pBiquadState->RightDC;
+        for(j=NrSamples-1;j>=0;j--)
+        {
+            /* Subtract DC an saturate */
+            Diff=*(pDataIn++)-(LeftDC>>16);
+            if (Diff > 32767) {
+                Diff = 32767; }
+            else if (Diff < -32768) {
+                Diff = -32768; }
+            *(pDataOut++)=(LVM_INT16)Diff;
+            if (Diff < 0) {
+                LeftDC -= DC_D16_STEP; }
+            else {
+                LeftDC += DC_D16_STEP; }
+
+
+            /* Subtract DC an saturate */
+            Diff=*(pDataIn++)-(RightDC>>16);
+            if (Diff > 32767) {
+                Diff = 32767; }
+            else if (Diff < -32768) {
+                Diff = -32768; }
+            *(pDataOut++)=(LVM_INT16)Diff;
+            if (Diff < 0) {
+                RightDC -= DC_D16_STEP; }
+            else {
+                RightDC += DC_D16_STEP; }
+
+        }
+        pBiquadState->LeftDC    =   LeftDC;
+        pBiquadState->RightDC   =   RightDC;
+
+
+    }
+