cReassemblyBufferVideo Class Reference

Video stream reassembly buffer. More...

#include <pes.h>

Public Member Functions
	cReassemblyBufferVideo ()
AVPacket *	PopAvPacket () override
bool	ParseCodecHeader (const uint8_t *, int)
	Parse video codec header to detect codec type.
bool	HasLeadingZero (const uint8_t *, int)
	Check if video data has a leading zero byte before the start code.
Public Member Functions inherited from cReassemblyBuffer
virtual void	Push (const uint8_t *data, int size, int64_t pts)
bool	IsEmpty ()
size_t	GetSize ()
void	Reset ()
	Reset the reassembly buffer.
AVCodecID	GetCodec ()

Static Private Attributes
static constexpr uint32_t	VIDEO_FRAME_START_CODE = 0x00'0001
static constexpr int	VIDEO_FRAME_START_CODE_LEN = 3
static constexpr uint8_t	MPEG2_STREAM_TYPE = 0xB3
static constexpr uint8_t	H264_STREAM_TYPE = 0x09
static constexpr uint8_t	HEVC_STREAM_TYPE = 0x46

Additional Inherited Members
Protected Member Functions inherited from cReassemblyBuffer
	cReassemblyBuffer (const char *identifier)
AVPacket *	PopAvPacket (int)
	Pop an AVPacket from the reassembly buffer.
Protected Attributes inherited from cReassemblyBuffer
AVCodecID	m_codec = AV_CODEC_ID_NONE
	detected codec ID
cPtsTrackingBuffer	m_buffer
	fragmentation buffer
int64_t	m_lastPoppedPts = AV_NOPTS_VALUE
	PTS of the last popped AVPacket.

Detailed Description

Video stream reassembly buffer.

Reassembles video elementary streams (MPEG2, H.264, HEVC) by detecting frame start codes and codec headers.

Definition at line 141 of file pes.h.

Constructor & Destructor Documentation

cReassemblyBufferVideo()

cReassemblyBufferVideo::cReassemblyBufferVideo ( )

inline

Definition at line 143 of file pes.h.

Member Function Documentation

HasLeadingZero()

bool cReassemblyBufferVideo::HasLeadingZero	(	const uint8_t *	data,
		int	size
	)

Check if video data has a leading zero byte before the start code.

Some H.264/HEVC streams include a leading zero byte (0x00) before the standard start code (0x000001). This method detects that pattern.

Parameters

data	Pointer to video data
size	Size of the data in bytes

Returns

true if a leading zero is present, false otherwise

Definition at line 431 of file pes.cpp.

References ReadBytes(), VIDEO_FRAME_START_CODE, and VIDEO_FRAME_START_CODE_LEN.

Referenced by ParseCodecHeader(), cSoftHdDevice::PlayVideoInternal(), and TEST_CASE().

ParseCodecHeader()

bool cReassemblyBufferVideo::ParseCodecHeader	(	const uint8_t *	fragment,
		int	size
	)

Parse video codec header to detect codec type.

Analyzes video frame start codes and stream type bytes to identify the codec. Supports MPEG2, H.264, and HEVC video codecs.

Parameters

fragment	Pointer to video frame data
size	Size of the fragment in bytes

Returns

true if a codec was detected, false otherwise

Definition at line 398 of file pes.cpp.

References H264_STREAM_TYPE, HasLeadingZero(), HEVC_STREAM_TYPE, cReassemblyBuffer::m_codec, MPEG2_STREAM_TYPE, ReadBytes(), VIDEO_FRAME_START_CODE, and VIDEO_FRAME_START_CODE_LEN.

Referenced by cSoftHdDevice::PlayVideoInternal(), TEST_CASE(), TEST_CASE(), TEST_CASE(), TEST_CASE(), and TEST_CASE().

PopAvPacket()

AVPacket * cReassemblyBufferVideo::PopAvPacket ( )

inlineoverridevirtual

Implements cReassemblyBuffer.

Definition at line 144 of file pes.h.

References cPtsTrackingBuffer::GetSize(), cReassemblyBuffer::m_buffer, and cReassemblyBuffer::PopAvPacket().

Referenced by cSoftHdDevice::HandleStillPicture(), cSoftHdDevice::PlayVideoInternal(), and TEST_CASE().

Member Data Documentation

H264_STREAM_TYPE

constexpr uint8_t cReassemblyBufferVideo::H264_STREAM_TYPE = 0x09

staticconstexprprivate

Definition at line 152 of file pes.h.

Referenced by ParseCodecHeader().

HEVC_STREAM_TYPE

constexpr uint8_t cReassemblyBufferVideo::HEVC_STREAM_TYPE = 0x46

staticconstexprprivate

Definition at line 153 of file pes.h.

Referenced by ParseCodecHeader().

MPEG2_STREAM_TYPE

constexpr uint8_t cReassemblyBufferVideo::MPEG2_STREAM_TYPE = 0xB3

staticconstexprprivate

Definition at line 151 of file pes.h.

Referenced by ParseCodecHeader().

VIDEO_FRAME_START_CODE

constexpr uint32_t cReassemblyBufferVideo::VIDEO_FRAME_START_CODE = 0x00'0001

staticconstexprprivate

Definition at line 148 of file pes.h.

Referenced by HasLeadingZero(), and ParseCodecHeader().

VIDEO_FRAME_START_CODE_LEN

constexpr int cReassemblyBufferVideo::VIDEO_FRAME_START_CODE_LEN = 3

staticconstexprprivate

Definition at line 149 of file pes.h.

Referenced by HasLeadingZero(), and ParseCodecHeader().

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

• pes.h
• pes.cpp