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/rvlcbit.cpp | 73 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 73 insertions(+)
 create mode 100644 libAACdec/src/rvlcbit.cpp

(limited to 'libAACdec/src/rvlcbit.cpp')

diff --git a/libAACdec/src/rvlcbit.cpp b/libAACdec/src/rvlcbit.cpp
new file mode 100644
index 0000000..c3ffc59
--- /dev/null
+++ b/libAACdec/src/rvlcbit.cpp
@@ -0,0 +1,73 @@
+/****************************************************************************
+
+                     (C) Copyright Fraunhofer IIS (2004)
+                               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.
+
+
+   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.
+
+ $Id$
+
+****************************************************************************/
+/*!
+  \file
+  \brief  RVLC bitstream reading
+  \author Robert Weidner
+*/
+
+#include "rvlcbit.h"
+
+
+/*---------------------------------------------------------------------------------------------
+     function:     rvlcReadBitFromBitstream
+
+     description:  This function returns a bit from the bitstream according to read direction.
+                   It is called very often, therefore it makes sense to inline it (runtime).
+-----------------------------------------------------------------------------------------------
+        input:     - bitstream
+                   - pPosition
+                   - readDirection
+-----------------------------------------------------------------------------------------------
+        return:    - bit from bitstream
+-------------------------------------------------------------------------------------------- */
+
+UCHAR rvlcReadBitFromBitstream (HANDLE_FDK_BITSTREAM  bs,
+                                USHORT               *pPosition,
+                                UCHAR                 readDirection)
+{
+  UINT   bit;
+  INT    readBitOffset = *pPosition-FDKgetBitCnt(bs);
+
+  if( readBitOffset ) {
+    FDKpushBiDirectional(bs, readBitOffset);
+  }
+
+  if (readDirection == FWD) {
+    bit = FDKreadBits(bs, 1);
+
+    *pPosition += 1;
+  } else {
+    /* to be replaced with a brother function of FDKreadBits() */
+    bit = FDKreadBits(bs, 1);
+    FDKpushBack(bs, 2);
+
+    *pPosition -= 1;
+  }
+
+  return (bit);
+}
+
-- 
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