Decoded 32 bit MP3 packet header with extended information. More...

Inheritance diagram for Burger::DecompressMP3::FrameHeaderExt_t:

Collaboration diagram for Burger::DecompressMP3::FrameHeaderExt_t:

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Public Member Functions
uint_t	Decode (const void *pInput)
	Decode the 32 bit packet header.

void	Layer2SelectTable (void)
	Set the Layer2 specific values.

Public Member Functions inherited from Burger::DecompressMP3::FrameHeader_t
uint_t	IsFreeFormat (void) const
	Return TRUE if bit rate is adjustable.

void	Invalidate (void)
	Mark the structure as invalid.

uint_t	is_valid (void) const
	Return TRUE if the structure is valid.

uint_t	Decode (const void *pInput)
	Decode the 32 bit packet header.

void	Encode (void *pOutput) const
	Encode the 32 bit MP3 packet header.

Public Attributes
const Layer2_AllocEntry_t *	m_pAllocEntry
	Layer 2 allocation entry used by decoding.

uint_t	m_uChannelCount
	1 mono, 2 stereo

uint_t	m_uSampleRateIndex
	0-8, index into the sampling rate table (Ver 1 0-2, Ver 2 3-5, Ver 2.5 6-8)

uint_t	m_uFrameSize
	Calculated frame size.

uint_t	m_uLayer2SubLimit
	Sub channel bits used by Layer 2.

Public Attributes inherited from Burger::DecompressMP3::FrameHeader_t
uint_t	m_uBitrateIndex
	4 bit index into the bit rate tables (0 = free format, 1-14 index)

uint_t	m_uSamplingRateFrequencyIndex
	0-2, index into the sampling rate table

uint_t	m_bPadding
	TRUE if the frame is padded by one extra slot

uint_t	m_bPrivateExtension
	TRUE if a private extension is present

uint_t	m_bCopyrighted
	TRUE if this file is copyrighted (Copy forbidden)

uint_t	m_bOriginalMedia
	TRUE if this is the original file

uint_t	m_bCRCPresent
	TRUE if there's a CRC-16 (IBM format) after the header

eMPEGAudioVersionID	m_uVersion
	MP3 Version 1, 2 or 2.5.

eMPEGLayerDescription	m_uLayerDescription
	MP3 Layer description 1,2 or 3.

eMPEGChannelMode	m_uChannelMode
	MP3 Channel mode.

eMPEGModeExtension	m_uModeExtension
	MP3 Mode extension.

eMPEGEmphasis	m_uEmphasis
	Decompression emphasis (Not really used anymore)

Detailed Description

Decoded 32 bit MP3 packet header with extended information.

This structure is derived from FrameHeader_t and in addition to setting the base values on decoding, extra data is calculated to ease the decoding of the MP3 data stream.

See also: FrameHeader_t or DecompressMP3

Member Function Documentation

◆ Decode()

uint_t BURGER_API Burger::DecompressMP3::FrameHeaderExt_t::Decode ( const void * pInput )

Decode the 32 bit packet header.

Details are found on this web page https://www.mp3-tech.org/programmer/frame_header.html

This function first calls the parent function FrameHeader_t::Decode(const void *) to fill in the base variables and test if the packet is valid. If it was valid the extended values are filled in.

Parameters

pInput Pointer to the 32 bit value in big endian (In memory encoding for the file)

Returns: Zero if no error, error code if there was a parsing issue.

See also: FrameHeader_t::Decode(const void *)

◆ Layer2SelectTable()

void BURGER_API Burger::DecompressMP3::FrameHeaderExt_t::Layer2SelectTable ( void )

Set the Layer2 specific values.

If Layer 2 decoding is needed, this function will set up a table pointer and the sub limit values

Member Data Documentation

◆ m_pAllocEntry

const Layer2_AllocEntry_t* Burger::DecompressMP3::FrameHeaderExt_t::m_pAllocEntry

Layer 2 allocation entry used by decoding.

◆ m_uChannelCount

uint_t Burger::DecompressMP3::FrameHeaderExt_t::m_uChannelCount

1 mono, 2 stereo

◆ m_uFrameSize

uint_t Burger::DecompressMP3::FrameHeaderExt_t::m_uFrameSize

Calculated frame size.

◆ m_uLayer2SubLimit

uint_t Burger::DecompressMP3::FrameHeaderExt_t::m_uLayer2SubLimit

Sub channel bits used by Layer 2.

◆ m_uSampleRateIndex

uint_t Burger::DecompressMP3::FrameHeaderExt_t::m_uSampleRateIndex

0-8, index into the sampling rate table (Ver 1 0-2, Ver 2 3-5, Ver 2.5 6-8)

Public Member Functions

Public Attributes