Burger::DecompressMP3::FrameHeader_t Struct Reference

Decoded 32 bit MP3 packet header. More...

Inheritance diagram for Burger::DecompressMP3::FrameHeader_t:

Public Member Functions
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
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.

---

The beginning of an MP3 data packet is a big endian 32 bit value broken down to certain bit fields that are described by these web pages https://www.mp3-tech.org/programmer/frame_header.html and http://www.datavoyage.com/mpgscript/mpeghdr.htm

This structure and functions will parse, validate and read or write this data from or into an MP3 data stream.

See also

FrameHeaderExt_t, DecompressMP3, eMPEGAudioVersionID, eMPEGLayerDescription, eMPEGChannelMode, eMPEGModeExtension or eMPEGEmphasis

Member Function Documentation

Decode()

uint_t BURGER_API Burger::DecompressMP3::FrameHeader_t::Decode

(

const void *

pInput

)

Decode the 32 bit packet header.

---

Details are found on these web pages https://www.mp3-tech.org/programmer/frame_header.html http://www.datavoyage.com/mpgscript/mpeghdr.htm

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

Encode(void *) const or DecompressMP3::ScanForFramePacket(uint_t) const

Encode()

void BURGER_API Burger::DecompressMP3::FrameHeader_t::Encode

(

void *

pOutput

)

const

Encode the 32 bit MP3 packet header.

---

Details are found on these web pages https://www.mp3-tech.org/programmer/frame_header.html http://www.datavoyage.com/mpgscript/mpeghdr.htm

Parameters

pOutput

Pointer to a 4 byte buffer to store the encoded data

See also

Decode(void *) or DecompressMP3::ScanForFramePacket(uint_t) const

Invalidate()

void Burger::DecompressMP3::FrameHeader_t::Invalidate ( void )

inline

Mark the structure as invalid.

---

See also

is_valid(void) const

is_valid()

uint_t Burger::DecompressMP3::FrameHeader_t::is_valid ( void ) const

inline

Return TRUE if the structure is valid.

---

See also

Invalidate(void)

IsFreeFormat()

uint_t Burger::DecompressMP3::FrameHeader_t::IsFreeFormat ( void ) const

inline

Return TRUE if bit rate is adjustable.

---

If this packet has a bit rate index of zero, return TRUE since this denotes a free format bit rate is used.

See also

FrameHeader_t

Member Data Documentation

m_bCopyrighted

uint_t Burger::DecompressMP3::FrameHeader_t::m_bCopyrighted

TRUE if this file is copyrighted (Copy forbidden)

m_bCRCPresent

uint_t Burger::DecompressMP3::FrameHeader_t::m_bCRCPresent

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

m_bOriginalMedia

uint_t Burger::DecompressMP3::FrameHeader_t::m_bOriginalMedia

TRUE if this is the original file

m_bPadding

uint_t Burger::DecompressMP3::FrameHeader_t::m_bPadding

TRUE if the frame is padded by one extra slot

m_bPrivateExtension

uint_t Burger::DecompressMP3::FrameHeader_t::m_bPrivateExtension

TRUE if a private extension is present

m_uBitrateIndex

uint_t Burger::DecompressMP3::FrameHeader_t::m_uBitrateIndex

4 bit index into the bit rate tables (0 = free format, 1-14 index)

m_uChannelMode

eMPEGChannelMode Burger::DecompressMP3::FrameHeader_t::m_uChannelMode

MP3 Channel mode.

m_uEmphasis

eMPEGEmphasis Burger::DecompressMP3::FrameHeader_t::m_uEmphasis

Decompression emphasis (Not really used anymore)

m_uLayerDescription

eMPEGLayerDescription Burger::DecompressMP3::FrameHeader_t::m_uLayerDescription

MP3 Layer description 1,2 or 3.

m_uModeExtension

eMPEGModeExtension Burger::DecompressMP3::FrameHeader_t::m_uModeExtension

MP3 Mode extension.

m_uSamplingRateFrequencyIndex

uint_t Burger::DecompressMP3::FrameHeader_t::m_uSamplingRateFrequencyIndex

0-2, index into the sampling rate table

m_uVersion

eMPEGAudioVersionID Burger::DecompressMP3::FrameHeader_t::m_uVersion

MP3 Version 1, 2 or 2.5.