ojph::param_qcd Class Reference

Quantization parameters object. More...

#include <ojph_params.h>

Public Types
enum	comp_type : ui8 { OJPH_COMP_Y = 0 , OJPH_COMP_CB = 1 , OJPH_COMP_CR = 2 , OJPH_COMP_UNDEFINED = 0xFF }

Public Member Functions
	param_qcd (local::param_qcd *p)
void	set_irrev_quant (float delta)
	Set the irreversible quantization base delta.
void	set_qfactor (ui8 qfactor)
	Sets Qfactor.
void	set_irrev_quant (ui32 comp_idx, float delta)
	Set the irreversible quantization base delta for a specific component.
void	set_qfactor (ui32 comp_idx, comp_type ctype, ui8 qfactor)
	Sets Qfactor for a specific component.

Static Public Member Functions
static comp_type	ui8_2_comp_type (ui8 c)

Private Attributes
local::param_qcd *	state

Detailed Description

Quantization parameters object.

Definition at line 169 of file ojph_params.h.

Member Enumeration Documentation

comp_type

enum ojph::param_qcd::comp_type : ui8

Enumerator
OJPH_COMP_Y
OJPH_COMP_CB
OJPH_COMP_CR
OJPH_COMP_UNDEFINED

Definition at line 172 of file ojph_params.h.

Constructor & Destructor Documentation

param_qcd()

ojph::param_qcd::param_qcd ( local::param_qcd * p )

inline

Definition at line 186 of file ojph_params.h.

References state.

Member Function Documentation

set_irrev_quant() [1/2]

void ojph::param_qcd::set_irrev_quant

(

float

delta

)

Set the irreversible quantization base delta.

This represents the default base delta and influences QCD marker segment

Parameters

delta

Definition at line 411 of file ojph_params.cpp.

References state.

Referenced by LLVMFuzzerTestOneInput(), main(), and TEST().

set_irrev_quant() [2/2]

void ojph::param_qcd::set_irrev_quant	(	ui32	comp_idx,
		float	delta )

Set the irreversible quantization base delta for a specific component.

This represents the default base delta for component comp_idx, and influences QCC marker segment for the component, inserting one if needed, which is usually the case.

Parameters

comp_idx
delta

Definition at line 422 of file ojph_params.cpp.

References state.

set_qfactor() [1/2]

void ojph::param_qcd::set_qfactor	(	ui32	comp_idx,
		comp_type	ctype,
		ui8	qfactor )

Sets Qfactor for a specific component.

Setting Qfactor takes precedence over setting an irreversible quantization base delta

Parameters

comp_idx	Component index
ctype	Indicates whether the component is a Y, Cb or Cr channel, after the ICT if present
qfactor	Compression quality as an integer between 1 (worst quality) and 100 (best quality)

Definition at line 428 of file ojph_params.cpp.

References state.

set_qfactor() [2/2]

void ojph::param_qcd::set_qfactor

(

ui8

qfactor

)

Sets Qfactor.

This is a top level Qfactor; it will automatically set the qfactor; if you have one or two channels they will be set to luminance (or Y) visual weighting. If you have three or more, the first three will be set to Y, Cb, Cr; channels 4 onwards will be set to luminance. If that does not match the desired behaviour; then do not set the top level qfactor, but set the Qfactor for individual channels according to desired visual weighting type, using set_qfactor(ui32 comp_idx, comp_type ctype, ui8 qfactor);

Note that setting Qfactor takes precedence over setting an irreversible quantization base delta.

Parameters

qfactor

Compression quality as an integer between 1 (worst quality) and 100 (best quality)

Definition at line 417 of file ojph_params.cpp.

References state.

Referenced by main().

ui8_2_comp_type()

comp_type ojph::param_qcd::ui8_2_comp_type ( ui8 c )

inlinestatic

Definition at line 178 of file ojph_params.h.

References OJPH_COMP_CR, OJPH_COMP_UNDEFINED, and OJPH_COMP_Y.

Referenced by ojph::local::param_qcd::check_validity().

Member Data Documentation

state

local::param_qcd* ojph::param_qcd::state

private

Definition at line 246 of file ojph_params.h.

Referenced by param_qcd(), set_irrev_quant(), set_irrev_quant(), set_qfactor(), and set_qfactor().

---

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

• /build/openjph/src/OpenJPH/src/core/openjph/ojph_params.h
• /build/openjph/src/OpenJPH/src/core/codestream/ojph_params.cpp