From 9bf37cc9712506b2483650c82d3c41152337ef7e Mon Sep 17 00:00:00 2001
From: Dave Burke <daveburke@google.com>
Date: Tue, 17 Apr 2012 09:51:45 -0700
Subject: Fraunhofer AAC codec.

License boilerplate update to follow.

Change-Id: I2810460c11a58b6d148d84673cc031f3685e79b5
---
 libAACdec/src/arm/block_arm.cpp | 77 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 77 insertions(+)
 create mode 100644 libAACdec/src/arm/block_arm.cpp

(limited to 'libAACdec/src/arm')

diff --git a/libAACdec/src/arm/block_arm.cpp b/libAACdec/src/arm/block_arm.cpp
new file mode 100644
index 0000000..d9d0cf8
--- /dev/null
+++ b/libAACdec/src/arm/block_arm.cpp
@@ -0,0 +1,77 @@
+/********************************  Fraunhofer IIS  ***************************
+
+                        (C) Copyright Fraunhofer IIS (2010)
+                               All Rights Reserved
+
+    Please be advised that this software and/or program delivery is
+    Confidential Information of Fraunhofer and subject to and covered by the
+
+    Fraunhofer IIS Software Evaluation Agreement
+    between Google Inc. and  Fraunhofer
+    effective and in full force since March 1, 2012.
+
+    You may use this software and/or program only under the terms and
+    conditions described in the above mentioned Fraunhofer IIS Software
+    Evaluation Agreement. Any other and/or further use requires a separate agreement.
+
+
+   $Id$
+   Author(s):   Arthur Tritthart
+   Description: (ARM optimised) Scaling of spectral data
+
+   This software and/or program is protected by copyright law and international
+   treaties. Any reproduction or distribution of this software and/or program,
+   or any portion of it, may result in severe civil and criminal penalties, and
+   will be prosecuted to the maximum extent possible under law.
+
+******************************************************************************/
+
+
+#define FUNCTION_CBlock_ScaleSpectralData_func1
+
+/* Note: This loop is only separated for ARM in order to save cycles
+         by loop unrolling. The ARM core provides by default a 5-cycle
+         loop overhead per sample, that goes down to 1-cycle per sample
+         with an optimal 4x-loop construct (do - 4x - while).
+*/
+
+FDK_INLINE static void CBlock_ScaleSpectralData_func1(
+    FIXP_DBL *pSpectrum,
+    int max_band,
+    const SHORT * RESTRICT BandOffsets,
+    int SpecScale_window,
+    const SHORT * RESTRICT pSfbScale,
+    int window)
+{
+  int band_offset = 0;
+  for (int band=0; band < max_band; band++)
+  {
+    int runs = band_offset;
+    band_offset = BandOffsets[band+1];
+    runs = band_offset - runs;    /* is always a multiple of 4 */
+    int scale = SpecScale_window-pSfbScale[window*16+band];
+    if (scale)
+    {
+      do
+      {
+        FIXP_DBL tmp0, tmp1, tmp2, tmp3;
+        tmp0 = pSpectrum[0];
+        tmp1 = pSpectrum[1];
+        tmp2 = pSpectrum[2];
+        tmp3 = pSpectrum[3];
+        tmp0 >>= scale;
+        tmp1 >>= scale;
+        tmp2 >>= scale;
+        tmp3 >>= scale;
+        *pSpectrum++ = tmp0;
+        *pSpectrum++ = tmp1;
+        *pSpectrum++ = tmp2;
+        *pSpectrum++ = tmp3;
+      } while ((runs = runs-4) != 0);
+    }
+    else
+    {
+      pSpectrum+= runs;
+    }
+  }
+}
-- 
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