1 files changed, 102 insertions, 0 deletions
diff --git a/media/libstagefright/codecs/aacenc/src/band_nrg.c b/media/libstagefright/codecs/aacenc/src/band_nrg.c
new file mode 100644
index 0000000..666c4ca
--- /dev/null
+++ b/media/libstagefright/codecs/aacenc/src/band_nrg.c
@@ -0,0 +1,102 @@
+/*
+ ** Copyright 2003-2010, VisualOn, Inc.
+ **
+ ** 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.
+ */
+/*******************************************************************************
+	File:		band_nrg.c
+
+	Content:	Band/Line energy calculations functions
+
+*******************************************************************************/
+
+#include "basic_op.h"
+#include "band_nrg.h"
+
+#ifndef ARMV5E
+/********************************************************************************
+*
+* function name: CalcBandEnergy
+* description:   Calc sfb-bandwise mdct-energies for left and right channel
+*
+**********************************************************************************/
+void CalcBandEnergy(const Word32 *mdctSpectrum,
+                    const Word16 *bandOffset,
+                    const Word16  numBands,
+                    Word32       *bandEnergy,
+                    Word32       *bandEnergySum)
+{
+  Word32 i, j;
+  Word32 accuSum = 0;                                            
+
+  for (i=0; i<numBands; i++) {
+    Word32 accu = 0;                                             
+    for (j=bandOffset[i]; j<bandOffset[i+1]; j++)
+      accu = L_add(accu, MULHIGH(mdctSpectrum[j], mdctSpectrum[j]));
+
+	accu = L_add(accu, accu);
+    accuSum = L_add(accuSum, accu);
+    bandEnergy[i] = accu;                                        
+  }
+  *bandEnergySum = accuSum;                                      
+}
+
+/********************************************************************************
+*
+* function name: CalcBandEnergyMS
+* description:   Calc sfb-bandwise mdct-energies for left add or minus right channel
+*
+**********************************************************************************/
+void CalcBandEnergyMS(const Word32 *mdctSpectrumLeft,
+                      const Word32 *mdctSpectrumRight,
+                      const Word16 *bandOffset,
+                      const Word16  numBands,
+                      Word32       *bandEnergyMid,
+                      Word32       *bandEnergyMidSum,
+                      Word32       *bandEnergySide,
+                      Word32       *bandEnergySideSum)
+{
+
+  Word32 i, j;
+  Word32 accuMidSum = 0;        
+  Word32 accuSideSum = 0;                                          
+ 
+
+  for(i=0; i<numBands; i++) {
+    Word32 accuMid = 0;
+    Word32 accuSide = 0;                                           
+    for (j=bandOffset[i]; j<bandOffset[i+1]; j++) {
+      Word32 specm, specs; 
+      Word32 l, r;
+
+      l = mdctSpectrumLeft[j] >> 1;
+      r = mdctSpectrumRight[j] >> 1;
+      specm = l + r;
+      specs = l - r;
+      accuMid = L_add(accuMid, MULHIGH(specm, specm));
+      accuSide = L_add(accuSide, MULHIGH(specs, specs));
+    }
+    
+	accuMid = L_add(accuMid, accuMid);
+	accuSide = L_add(accuSide, accuSide);
+	bandEnergyMid[i] = accuMid;                                  
+    accuMidSum = L_add(accuMidSum, accuMid);
+    bandEnergySide[i] = accuSide;                                
+    accuSideSum = L_add(accuSideSum, accuSide);
+    
+  }
+  *bandEnergyMidSum = accuMidSum;                                
+  *bandEnergySideSum = accuSideSum;                              
+}
+
+#endif
+\ No newline at end of file