mp3info.h

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#pragma once

#ifndef __MP3INFO_H__
#define __MP3INFO_H__

// INCLUDES
#include "fileinfo.h"
#include "mp3_frame_header.h"
#include "fileio.h"

// USINGS
using std::string;
using std::streamsize;
using std::streamoff;
using std::exception;

class mp3info: public fileinfo
{
    // Member functions.
public:
    mp3info(const string& FileName);
    virtual ~mp3info(void);
    virtual void Show(void) const;
protected:
    virtual void FirstStep(void);
    virtual streamoff Step(char* pContent, streamsize ContentSize, streamoff FileOffset);
    virtual void LastStep(void);
private:
    streamsize GetID3v2Size(void);
    streamoff FindFrameSync(char* pContent, streamsize ContentSize);
    bool IsValidFrameSync(char* pContent, streamsize ContentSize);
    streamoff ReadFrames(char* pContent, streamsize ContentSize, streamoff FileOffset);
    int GetDuration(void);

    // Attributes.
private:
    streamoff m_FirstFrameOffset;           
    mp3_frame_header* m_pMP3FrameHeader;    
    int m_Frames;                           
    long long m_BitrateAcum;                
    bool m_GotMoreFrames;                   
};

// MP3info exceptions.
namespace except
{
        class mp3info_except: public exception
        {
        // Member functions.
    public:
        mp3info_except(void) throw(): exception() {};
        virtual ~mp3info_except(void) throw() {};
        virtual const char *what(void) const throw()=0;
        };

        class no_mp3_file: public mp3info_except
        {
                // Member functions.
        public:
                no_mp3_file(const string& FileName) throw();
        virtual ~no_mp3_file(void) throw();
                virtual const char *what(void) const throw();
        
        // Attributes.
    private:
        string m_FileName;    
        };

        class no_frame_sync: public mp3info_except
        {
                // Member functions.
        public:
                no_frame_sync(void) throw();
        virtual ~no_frame_sync(void) throw();
                virtual const char *what(void) const throw();
                void SetOffset(streamoff Offset) throw();
        
        // Attributes.
    private:
        string m_Offset;    
        };
};

#endif // __MP3INFO_H__

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