Initial community commit

Src/replicant/nsmp3dec/bitstream.h

@@ -0,0 +1,103 @@
+/***************************************************************************\
+ *
+*                    MPEG Layer3-Audio Decoder
+*                  <20> 1997-2006 by Fraunhofer IIS
+ *                        All Rights Reserved
+ *
+ *   filename: bitstream.h
+ *   project : MPEG Decoder
+ *   author  : Martin Sieler
+ *   date    : 1997-12-05
+ *   contents/description: generic bitbuffer - HEADER
+ *
+ *
+\***************************************************************************/
+
+/*
+ * $Date: 2011/01/18 18:22:02 $
+ * $Id: bitstream.h,v 1.4 2011/01/18 18:22:02 audiodsp Exp $
+ */
+
+#ifndef __BITSTREAM_H__
+#define __BITSTREAM_H__
+
+/* ------------------------ includes --------------------------------------*/
+
+/*-------------------------- defines --------------------------------------*/
+
+class CGioBase;
+
+/*-------------------------------------------------------------------------*/
+
+//
+// Bitstream input class.
+//
+//    This class defines the interface that the mp3 decoder object will
+//    read all of its bitstream input data from.
+//
+
+class CBitStream
+{
+public:
+
+  CBitStream(int cbSize);
+  CBitStream(unsigned char *pBuf, int cbSize, bool fDataValid = false);
+  virtual ~CBitStream();
+
+  virtual void   Reset();
+	bool ByteAligned() const { return !(m_BitNdx & 7); }
+  bool           ResetOccurred()           { return m_ResetOccurred;  }
+  void           SetResetState(bool state) { m_ResetOccurred = state; }
+
+  void           Connect(CGioBase *pGB);
+
+  void           ResetBitCnt()     { m_BitCnt = 0;    }
+  int            GetBitCnt() const { return m_BitCnt; }
+
+  unsigned int   GetBits(unsigned int nBits); // gets 16 bits or less
+	unsigned int   GetBits8(unsigned int nBits); // gets 8 bits or less
+  unsigned int   Get1Bit();
+  unsigned long  Get32Bits();
+
+  bool           Ff(int nBits)     { return ( (nBits > 0) ? Seek(nBits)  : false); }
+  bool           Rewind(int nBits) { return ( (nBits > 0) ? Seek(-nBits) : false); }
+  bool           Seek(int nBits)
+    {
+    m_BitCnt    += nBits;
+    m_ValidBits -= nBits;
+    m_BitNdx     = (m_BitNdx+nBits) & m_bitMask;
+    return true;
+    }
+
+  int            GetValidBits() const { return m_ValidBits; }
+  int            GetFree()      const;
+
+  void           SetEof();
+  int            Fill(const unsigned char *pBuf, int cbSize);
+  int            Fill(CBitStream &Bs, int cbSize);
+
+protected:
+
+  int            Refill();
+  bool           IsEof()       const;
+  bool           IsConnected() const;
+
+private:
+
+  CGioBase      *m_pGB;           // I/O object
+  int            m_nBytes;        // size of buffer in bytes
+	int						 m_mask;
+  int            m_nBits;         // size of buffer in bits
+	int					   m_bitMask;
+  int            m_ValidBits;     // valid bits in buffer
+  int            m_ReadOffset;    // where to write next
+  int            m_BitCnt;        // bit counter
+  int            m_BitNdx;        // position of next bit in byte
+  bool           m_fEof;          // indication of input eof
+  unsigned char *m_Buf;           // the buffer
+  bool           m_fBufferIntern; // did we allocate the buffer ourselves
+  bool           m_ResetOccurred; // reset just occurred, only for dynamic buffer used
+};
+
+/*-------------------------------------------------------------------------*/
+#endif