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