Initial community commit

Src/replicant/nsmp3dec/bitsequence.h

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+/***************************************************************************\
+ *
+*                    MPEG Layer3-Audio Decoder
+*                  © 1997-2006 by Fraunhofer IIS
+ *                        All Rights Reserved
+ *
+ *   filename: bitsequence.h
+ *   project : MPEG Decoder
+ *   author  : Martin Sieler
+ *   date    : 1997-12-23
+ *   contents/description: HEADER - bitsequence object
+ *
+ *
+\***************************************************************************/
+
+/*
+ * $Date: 2010/11/17 20:46:01 $
+ * $Id: bitsequence.h,v 1.1 2010/11/17 20:46:01 audiodsp Exp $
+ */
+
+#ifndef __BITSEQUENCE_H__
+#define __BITSEQUENCE_H__
+
+/* ------------------------ includes --------------------------------------*/
+
+#include "bitstream.h"
+
+/*-------------------------- defines --------------------------------------*/
+
+/*-------------------------------------------------------------------------*/
+
+//
+// Bitstream parser class.
+//
+//  This helper class is basically a numerical value that can read itself from
+//  a CBitStream interface for convenience. The decoder almost completely
+//  does the bitstream parsing through CBitSequence rather than CBitStream
+//  directly.
+//
+
+class CBitSequence
+{
+public:
+
+  CBitSequence(int nBits = 0) { m_nBits = nBits; m_nValue = 0; }
+  virtual ~CBitSequence() {}
+
+  void SetNumberOfBits(int nBits) { m_nBits = nBits; }
+  int  GetNumberOfBits() const    { return m_nBits; }
+
+  bool ReadFrom(CBitStream &Bs) { m_nValue = Bs.GetBits(m_nBits); return true; }
+  bool ReadFrom_Bit(CBitStream &Bs) { m_nValue = Bs.Get1Bit(); return true; }
+  bool ReadFrom(CBitStream &Bs, int nBits) { SetNumberOfBits(nBits); return ReadFrom(Bs); }
+
+  bool Equals(int nValue) const { return (m_nValue == nValue); }
+
+  int  ToInt() const        { return m_nValue; }
+  void FromInt(int nValue) { m_nValue = nValue; }
+
+protected:
+
+private:
+
+  int m_nBits;
+  int m_nValue;
+};
+
+/*-------------------------------------------------------------------------*/
+#endif