mp3info Class Reference

#include <mp3info.h>

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List of all members.

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Detailed Description

MP3info class.

Public Member Functions
	mp3info (const string &FileName)
	MP3Info constructor.
virtual	~mp3info (void)
	MP3Info destructor.
virtual void	Show (void) const
	Show debug information for fileinfo.
Protected Member Functions
virtual void	FirstStep (void)
	First step of the mp3info construction.
virtual streamoff	Step (char *pContent, streamsize ContentSize, streamoff FileOffset)
	Loop step of the mp3info construction.
virtual void	LastStep (void)
	Last step of the mp3info construction.
Private Member Functions
streamsize	GetID3v2Size (void)
	Gets the id3v2 tag size.
streamoff	FindFrameSync (char *pContent, streamsize ContentSize)
	Finds first valid frame synchronized.
bool	IsValidFrameSync (char *pContent, streamsize ContentSize)
	Check if there is a good frame sync at Offset.
streamoff	ReadFrames (char *pContent, streamsize ContentSize, streamoff FileOffset)
	Count all MP3 frames in a block of memory (and get VBR data).
int	GetDuration (void)
	Gets the length of the MP3 in seconds.
Private Attributes
streamoff	m_FirstFrameOffset
	Offset of the first frame.
mp3_frame_header *	m_pMP3FrameHeader
	Pointer to the MP3 frame header object.
int	m_Frames
	Number of frames of the MP3.
long long	m_BitrateAcum
	Bit rate accumulator to get the AVG.
bool	m_GotMoreFrames
	Flag to indicate that there are more frames to read.

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Constructor & Destructor Documentation

mp3info::mp3info (  const string &  FileName  )

MP3Info constructor. Parameters: FileName:  File to construct the file information. Note: A valid MP3 file is a file that gots at least 2 synchronized frames in the first "MAX_OFFSET_WITHOUT_FRAMESYNC" bytes after de id3v2 data.

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mp3info::~mp3info (  void   )  [virtual]

MP3Info destructor.

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Member Function Documentation

void mp3info::Show (  void   )  const [virtual]

Show debug information for fileinfo. Reimplemented from fileinfo.

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void mp3info::FirstStep (  void   )  [protected, virtual]

First step of the mp3info construction. Reimplemented from fileinfo.

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streamoff mp3info::Step (  char *  pContent, streamsize  ContentSize, streamoff  FileOffset )  [protected, virtual]

Loop step of the mp3info construction. Parameters: pContent:  Buffer with file data. ContentSize:  Size of the buffer. FileOffset:  Offset of the file where the buffer starts. Returns: Last offset. Reimplemented from fileinfo.

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void mp3info::LastStep (  void   )  [protected, virtual]

Last step of the mp3info construction. Reimplemented from fileinfo.

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streamsize mp3info::GetID3v2Size (  void   )  [private]

Gets the id3v2 tag size. Returns: Size of the id3v2 tag or 0 if not detected. Note: An ID3v2 tag can be detected with the following pattern: $49 44 33 yy yy xx zz zz zz zz Where yy is less than $FF, xx is the 'flags' byte and zz is less than $80. If one of the undefined flags (00011111b = 0x1f) are set that might mean that the tag is not readable.

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streamoff mp3info::FindFrameSync (  char *  pContent, streamsize  ContentSize )  [private]

Finds first valid frame synchronized. Parameters: pContent:  Pointer to the block of memory. ContentSize:  Size of the block. Returns: Offset of the first valid frame sync found.

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bool mp3info::IsValidFrameSync (  char *  pContent, streamsize  ContentSize )  [private]

Check if there is a good frame sync at Offset. Parameters: pContent:  Pointer to the block of memory. ContentSize:  Size of the block. Returns: True if the frames are synchronized, false if not or out of content.

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streamoff mp3info::ReadFrames (  char *  pContent, streamsize  ContentSize, streamoff  FileOffset )  [private]

Count all MP3 frames in a block of memory (and get VBR data). Parameters: pContent:  Pointer to the block of memory. ContentSize:  Size of the block. FileOffset:  Offset of the file where the buffer starts.

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int mp3info::GetDuration (  void   )  [private]

Gets the length of the MP3 in seconds. Returns: Number of seconds.

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Member Data Documentation

streamoff mp3info::m_FirstFrameOffset [private]

Offset of the first frame.

mp3_frame_header* mp3info::m_pMP3FrameHeader [private]

Pointer to the MP3 frame header object.

int mp3info::m_Frames [private]

Number of frames of the MP3.

long long mp3info::m_BitrateAcum [private]

Bit rate accumulator to get the AVG.

bool mp3info::m_GotMoreFrames [private]

Flag to indicate that there are more frames to read.

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The documentation for this class was generated from the following files:

• mp3info.h
• mp3info.cpp

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