HeaderParserMP3 Class Reference

MP3 header parser to check if the data is a valid mp3 and to extract some relevant audio information. We try to find some valid frames with a valid sync in the beginning and the end. See https://www.codeproject.com/KB/audio-video/mpegaudioinfo.aspx. More...

#include <HeaderParserMP3.h>

Public Member Functions
int	findSyncWord (const uint8_t *buf, size_t nBytes, uint8_t synch=0xFF, uint8_t syncl=0xF0)
	Finds the mp3/aac sync word.
int	getBitRate () const
FrameHeader	getFrameHeader ()
int	getFrameLength ()
	Determines the frame length.
const char *	getLayerStr () const
size_t	getPlayingTime (size_t fileSizeBytes)
uint16_t	getSampleRate () const
const char *	getVersionStr () const
bool	isValid (const uint8_t *data, int len)
	parses the header string and returns true if this is a valid mp3 file

Protected Types
enum class	FrameReason {   VALID , INVALID_BITRATE_FOR_VERSION , INVALID_SAMPLERATE_FOR_VERSION , INVALID_MPEG_VERSION ,   INVALID_LAYER , INVALID_LAYER_II_BITRATE_AND_MODE , INVALID_EMPHASIS , INVALID_CRC }

Protected Member Functions
bool	contains (const uint8_t *data, const char *toFind, size_t len)
void	readFrameHeader (const uint8_t *data)
int	seekFrameSync (const uint8_t *str, size_t len)
bool	validate (const uint8_t *data, size_t len)
FrameReason	validateFrameHeader (const FrameHeader &header)

Protected Attributes
FrameHeader	header

Detailed Description

MP3 header parser to check if the data is a valid mp3 and to extract some relevant audio information. We try to find some valid frames with a valid sync in the beginning and the end. See https://www.codeproject.com/KB/audio-video/mpegaudioinfo.aspx.

Author

Phil Schatzmann

Copyright

GPLv3

Member Function Documentation

getPlayingTime()

size_t getPlayingTime ( size_t  fileSizeBytes )

inline

Provides the estimated playing time in seconds based on the bitrate of the first segment

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

• src/AudioTools/AudioCodecs/HeaderParserMP3.h