L4TMJpegLoader Namespace Reference

Functions
bool	init ()
bool	isAvailable ()
struct jpeg_error_mgr *	std_error (struct jpeg_error_mgr *err)
void	create_compress (j_compress_ptr cinfo)
void	destroy_compress (j_compress_ptr cinfo)
void	mem_dest (j_compress_ptr cinfo, unsigned char **outbuffer, unsigned long *outsize)
void	set_defaults (j_compress_ptr cinfo)
void	set_quality (j_compress_ptr cinfo, int quality, boolean force_baseline)
void	suppress_tables (j_compress_ptr cinfo, boolean suppress)
void	start_compress (j_compress_ptr cinfo, boolean write_all_tables)
JDIMENSION	write_scanlines (j_compress_ptr cinfo, JSAMPARRAY scanlines, JDIMENSION num_lines)
JDIMENSION	write_raw_data (j_compress_ptr cinfo, JSAMPIMAGE data, JDIMENSION num_lines)
void	finish_compress (j_compress_ptr cinfo)
void	set_hardware_acceleration_parameters_enc (j_compress_ptr cinfo, boolean hw_acceleration, unsigned int defaultBuffSize, unsigned int maxBuffSize, unsigned int hwBuffSize)
void	create_decompress (j_decompress_ptr cinfo)
void	destroy_decompress (j_decompress_ptr cinfo)
void	mem_src (j_decompress_ptr cinfo, unsigned char *inbuffer, unsigned long insize)
int	read_header (j_decompress_ptr cinfo, boolean require_image)
boolean	start_decompress (j_decompress_ptr cinfo)
JDIMENSION	read_raw_data (j_decompress_ptr cinfo, JSAMPIMAGE data, JDIMENSION max_lines)
boolean	finish_decompress (j_decompress_ptr cinfo)

Detailed Description

L4TMJpegLoader - Dynamic loader for NVIDIA's libnvjpeg.so

This wrapper exists to resolve a symbol conflict between:

1. vcpkg's libjpeg-turbo (linked statically, version 62, struct size 520/632)
2. NVIDIA's libnvjpeg.so (contains libjpeg version 80, struct size 728/776)

L4TM modules (JPEGEncoderL4TM, JPEGDecoderL4TM) need NVIDIA's extended jpeg structs with fields like image_scale, scaled_image_width, etc.

By using dlopen/dlsym, we bypass the linker's symbol resolution and ensure L4TM code calls the correct NVIDIA implementation.

See: docs/declarative-pipeline/JETSON_KNOWN_ISSUES.md (Issue J1)

Dynamic loader for NVIDIA's libnvjpeg.so

This module resolves the libjpeg version conflict between vcpkg (v62) and NVIDIA's L4T Multimedia API (v80) by dynamically loading functions from libnvjpeg.so at runtime, bypassing the static linker.

The struct sizes differ significantly:

• vcpkg: jpeg_compress_struct=520, jpeg_decompress_struct=632
• NVIDIA: jpeg_compress_struct=728, jpeg_decompress_struct=776

L4TM code compiled with NVIDIA headers uses the larger structs, so we must call libnvjpeg.so's implementation which expects those struct sizes.

Function Documentation

create_compress()

void L4TMJpegLoader::create_compress

(

j_compress_ptr

cinfo

)

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create_decompress()

void L4TMJpegLoader::create_decompress

(

j_decompress_ptr

cinfo

)

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destroy_compress()

void L4TMJpegLoader::destroy_compress

(

j_compress_ptr

cinfo

)

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destroy_decompress()

void L4TMJpegLoader::destroy_decompress

(

j_decompress_ptr

cinfo

)

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finish_compress()

void L4TMJpegLoader::finish_compress

(

j_compress_ptr

cinfo

)

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finish_decompress()

boolean L4TMJpegLoader::finish_decompress

(

j_decompress_ptr

cinfo

)

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init()

bool L4TMJpegLoader::init

(

)

Initialize the loader. Must be called before any other functions. Thread-safe (uses call_once internally).

Returns

true if libnvjpeg.so was loaded successfully

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isAvailable()

bool L4TMJpegLoader::isAvailable

(

)

Check if libnvjpeg.so is available and loaded.

Returns

true if loaded and ready to use

mem_dest()

void L4TMJpegLoader::mem_dest	(	j_compress_ptr	cinfo,
		unsigned char **	outbuffer,
		unsigned long *	outsize )

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mem_src()

void L4TMJpegLoader::mem_src	(	j_decompress_ptr	cinfo,
		unsigned char *	inbuffer,
		unsigned long	insize )

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read_header()

int L4TMJpegLoader::read_header	(	j_decompress_ptr	cinfo,
		boolean	require_image )

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read_raw_data()

JDIMENSION L4TMJpegLoader::read_raw_data	(	j_decompress_ptr	cinfo,
		JSAMPIMAGE	data,
		JDIMENSION	max_lines )

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set_defaults()

void L4TMJpegLoader::set_defaults

(

j_compress_ptr

cinfo

)

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set_hardware_acceleration_parameters_enc()

void L4TMJpegLoader::set_hardware_acceleration_parameters_enc	(	j_compress_ptr	cinfo,
		boolean	hw_acceleration,
		unsigned int	defaultBuffSize,
		unsigned int	maxBuffSize,
		unsigned int	hwBuffSize )

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set_quality()

void L4TMJpegLoader::set_quality	(	j_compress_ptr	cinfo,
		int	quality,
		boolean	force_baseline )

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start_compress()

void L4TMJpegLoader::start_compress	(	j_compress_ptr	cinfo,
		boolean	write_all_tables )

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start_decompress()

boolean L4TMJpegLoader::start_decompress

(

j_decompress_ptr

cinfo

)

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std_error()

struct jpeg_error_mgr * L4TMJpegLoader::std_error

(

struct jpeg_error_mgr *

err

)

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suppress_tables()

void L4TMJpegLoader::suppress_tables	(	j_compress_ptr	cinfo,
		boolean	suppress )

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write_raw_data()

JDIMENSION L4TMJpegLoader::write_raw_data	(	j_compress_ptr	cinfo,
		JSAMPIMAGE	data,
		JDIMENSION	num_lines )

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write_scanlines()

JDIMENSION L4TMJpegLoader::write_scanlines	(	j_compress_ptr	cinfo,
		JSAMPARRAY	scanlines,
		JDIMENSION	num_lines )

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