Represents the decoded fields of an MPEG Audio (MP1/MP2/MP3) frame header, laid out as a packed bitfield. More...

#include <mpeg-audio.h>

Public Attributes
unsigned int	emphasis:2
unsigned int	original:1
unsigned int	copyright:1
unsigned int	modeext:2
unsigned int	mode:2
unsigned int	priv:1
unsigned int	padding:1
unsigned int	frequency:2
unsigned int	bitrate:4
unsigned int	protection:1
unsigned int	layer:2
unsigned int	version:2
unsigned int	sync:11

Detailed Description

Represents the decoded fields of an MPEG Audio (MP1/MP2/MP3) frame header, laid out as a packed bitfield.

Member Data Documentation

◆ bitrate

unsigned int mpa::bitrate

Bitrate index into the MPEG bitrate table; value interpretation depends on version and layer.

◆ copyright

unsigned int mpa::copyright

Set to 1 if the audio content is copyright-protected.

◆ emphasis

unsigned int mpa::emphasis

De-emphasis type applied during encoding (0=none, 1=50/15ms, 3=CCIT J.17).

◆ frequency

unsigned int mpa::frequency

Sampling frequency index; value interpretation depends on version.

◆ layer

unsigned int mpa::layer

MPEG audio layer (1=Layer III, 2=Layer II, 3=Layer I; 0=reserved).

◆ mode

unsigned int mpa::mode

Channel mode (0=Stereo, 1=Joint Stereo, 2=Dual Channel, 3=Mono).

◆ modeext

unsigned int mpa::modeext

Mode extension for Joint Stereo mode; defines which bands use intensity/MS stereo.

◆ original

unsigned int mpa::original

Set to 1 if this is an original media file; 0 if it is a copy.

◆ padding

unsigned int mpa::padding

Set to 1 if a padding slot is inserted to adjust the frame's bitrate alignment.

◆ priv

unsigned int mpa::priv

Private bit; application-defined, no standardized meaning.

◆ protection

unsigned int mpa::protection

Set to 0 if a 16-bit CRC checksum follows the header; 1 if no CRC is present.

◆ sync

unsigned int mpa::sync

Frame sync word; all 11 bits must be set to 1 to identify a valid MPEG frame boundary.

◆ version

unsigned int mpa::version

MPEG version (0=MPEG 2.5, 2=MPEG 2, 3=MPEG 1; 1=reserved).

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

/builds/wireshark/wireshark/wsutil/mpeg-audio.h

Public Attributes