mpadecobjfltpt.h

著名的 helix realplayer 基于手机 symbian 系统的 播放器全套源代码

/* ***** BEGIN LICENSE BLOCK ***** 
 * Version: RCSL 1.0/RPSL 1.0 
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#ifndef _MPADECOBJFLTPT_H_
#define _MPADECOBJFLTPT_H_

class CMpaDecoder;
class CMpaDecoderL1;
class CMpaDecoderL2;
class CMpaDecoderL3;

class CMpaDecObj
{
public:
    CMpaDecObj();
    ~CMpaDecObj();

    ///////////////////////////////////////////////////////////////////////////
    // Function:    Init_n
    // Purpose:     Initialize the mp3 decoder.
    // Parameters:  pSync       a pointer to a syncword
    //              ulSize      the size of the buffer pSync points to
    //              bUseSize    this tells the decoder to use the input frame
    //                          size on the decode instead of calculating
    //                          the frame size.  This is necessary when
    //                          our formatted mp3 data (main_data_begin always
    //                          equal to 0).
    //
    // Returns:     The size of the frame pSync points to
    ///////////////////////////////////////////////////////////////////////////
    int     Init_n(unsigned char *pSync,
                   unsigned long ulSize,
                   unsigned char bUseSize=0);

    ///////////////////////////////////////////////////////////////////////////
    // Function:    DecodeFrame_v
    // Purpose:     Decodes one mp3 frame
    // Parameters:  ulSampRate  pointer to an mp3 frame (at a syncword)
    //              pulSize     size of the buffer pSource points to.  It will
    //                          contain the number of mp3 bytes decoded upon
    //                          return.
    //              pPCM        pointer to a buffer to decode into
    //              pulPCMSize  size of the PCM buffer.  It will contain the
    //                          number of PCM bytes prodced upon return.
    ///////////////////////////////////////////////////////////////////////////
    void    DecodeFrame_v(unsigned char *pSource,
              	          unsigned long *pulSize,
                   	      unsigned char *pPCM,
                       	  unsigned long *pulPCMSize);

    void    GetPCMInfo_v(unsigned long &ulSampRate,
                         int &nChannels,
                         int &nBitsPerSample);
                         
                         //{ m_pDec->GetPCMInfo_v(ulSampRate, nChannels, nBitsPerSample); };

    int     GetSamplesPerFrame_n();// {return m_pDec->GetSamplesPerFrame_n();};

    void    SetTrustPackets(unsigned char bTrust) { m_bTrustPackets = bTrust; }

private:
    CMpaDecoder         *m_pDec;        // Pointer to mpeg audio decoder
    CMpaDecoderL1       *m_pDecL1;      // Pointer to mpegl1 audio decoder
    CMpaDecoderL2       *m_pDecL2;      // Pointer to mpegl2 audio decoder
    CMpaDecoderL3       *m_pDecL3;      // Pointer to mpegl3 audio decoder
    unsigned char        m_bTrustPackets;

    unsigned char       m_bUseFrameSize;

};

#endif