CH264AnnexBBitstreamParser Class Reference

H.264 Annex B format closed caption parser. More...

#include <H264AnnexBBitstreamParser.h>

Inheritance diagram for CH264AnnexBBitstreamParser:

Public Member Functions
	CH264AnnexBBitstreamParser ()=default
	~CH264AnnexBBitstreamParser () override=default
CCPictureType	ParsePacket (DemuxPacket *pPacket, std::vector< CCaptionBlock > &tempBuffer, std::vector< CCaptionBlock > &reorderBuffer) override
	Parse Annex B packet for closed caption data.
const char *	GetName () const override
	Get parser name for debugging/logging.
Public Member Functions inherited from ICCBitstreamParser
virtual	~ICCBitstreamParser ()=default

Additional Inherited Members
Protected Member Functions inherited from CH264CCBitstreamParser
void	ProcessSEIPayload (std::span< const uint8_t > buf, double pts, std::vector< CCaptionBlock > &tempBuffer)
	Process SEI payload containing closed caption data.
CCPictureType	DetectSliceType (std::span< const uint8_t > buf)
	Detect slice type from H.264 slice header.

Detailed Description

H.264 Annex B format closed caption parser.

Parses H.264 streams in Annex B format used by MPEG-TS and broadcast streams. Annex B uses start codes to delimit NAL units:

• 0x000001 (3-byte start code) or 0x00000001 (4-byte start code)
• NAL unit data until next start code

Extracts CC data from SEI NAL units (type 6) with payload type 4.

Constructor & Destructor Documentation

CH264AnnexBBitstreamParser()

CH264AnnexBBitstreamParser::CH264AnnexBBitstreamParser ( )

default

~CH264AnnexBBitstreamParser()

CH264AnnexBBitstreamParser::~CH264AnnexBBitstreamParser ( )

overridedefault

Member Function Documentation

GetName()

const char * CH264AnnexBBitstreamParser::GetName ( ) const

inlineoverridevirtual

Get parser name for debugging/logging.

Returns

Human-readable parser name

Implements ICCBitstreamParser.

ParsePacket()

CCPictureType CH264AnnexBBitstreamParser::ParsePacket ( DemuxPacket * pPacket, std::vector< CCaptionBlock > & tempBuffer, std::vector< CCaptionBlock > & reorderBuffer )

overridevirtual

Parse Annex B packet for closed caption data.

Scans for start codes, extracts CC data from SEI NAL units, and detects picture type from slice headers.

Parameters

pPacket	H.264 video packet in Annex B format
tempBuffer	Temporary buffer for CC data from reference frames
reorderBuffer	Reorder buffer for CC data

Returns

Picture type (I_FRAME, P_FRAME, or OTHER)

Implements ICCBitstreamParser.

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

• H264AnnexBBitstreamParser.h
• H264AnnexBBitstreamParser.cpp