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/*************************************************************************** *
* MPEG Layer3-Audio Decoder
* © 1997-2006 by Fraunhofer IIS
* All Rights Reserved
*
* filename: mpegheader.h
* project : MPEG Decoder
* author : Martin Sieler
* date : 1997-12-05
* contents/description: ISO/MPEG Header
*
*
\***************************************************************************/
/*
* $Date: 2010/11/17 20:46:04 $
* $Id: mpegheader.h,v 1.1 2010/11/17 20:46:04 audiodsp Exp $
*/
#ifndef __MPEGHEADER_H__
#define __MPEGHEADER_H__
/* ------------------------ includes --------------------------------------*/
/*-------------------------- defines --------------------------------------*/
class CBitStream;
/*-------------------------------------------------------------------------*/
//
// MPEG header class.
//
// This object reads and decodes an ISO/MPEG header.
//
class CMpegHeader
{
public:
CMpegHeader();
virtual ~CMpegHeader();
int ReadFrom(CBitStream &sBS);
int FromInt(unsigned long dwHdrBits);
int GetMpegVersion() const { return m_MpegVersion;}
int GetLayer() const { return m_Layer;}
int GetChannels() const { return m_Channels;}
int GetSampleRate() const { return m_SampleRate;}
int GetSampleRateNdx() const { return m_SampleRateNdx;}
int GetBitrate() const { return m_Bitrate;}
int GetBitrateNdx() const { return m_BitrateNdx;}
int GetMode() const { return m_Mode;}
int GetModeExt() const { return m_ModeExt;}
int GetPadding() const { return m_Padding; }
int GetCrcCheck() const { return m_CrcCheck;}
int GetCopyright() const { return m_Copyright;}
int GetOriginal() const { return m_Original;}
int GetEmphasis() const { return m_Emphasis;}
int GetHeaderLen() const
{ return MPEG_HDRLEN+(m_CrcCheck?MPEG_CRCLEN:0); }
int GetFrameLen() const { return m_FrameLen;}
float GetDuration() const { return m_Duration;}
int GetSamplesPerFrame() const;
protected:
private:
enum { MPEG_HDRLEN = 32, MPEG_CRCLEN = 16 };
int CalcFrameLen();
void ResetMembers();
void SetMembers();
// header fields
int m_Syncword;
int m_Idex;
int m_Id;
int m_Layer;
int m_CrcCheck;
int m_BitrateNdx;
int m_SampleRateNdx;
int m_Padding;
int m_Private;
int m_Mode;
int m_ModeExt;
int m_Copyright;
int m_Original;
int m_Emphasis;
// calculated data
int m_HeaderValid;
int m_MpegVersion;
int m_Channels;
int m_SampleRate;
int m_Bitrate;
int m_FrameLen;
float m_Duration;
};
/*-------------------------------------------------------------------------*/
#endif
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