ts::DLT Class Reference

Representation of an ISDB DownLoad Table (DLT). More...

Inheritance diagram for ts::DLT:

Collaboration diagram for ts::DLT:

Public Member Functions
	DLT ()
	Default constructor.
	DLT (DuckContext &duck, const BinaryTable &table)
	Constructor from a binary table. More...

Static Public Member Functions
static void	DisplaySection (ts::TablesDisplay &display, const ts::Section &section, ts::PSIBuffer &payload, const ts::UString &margin)
	A static method to display a section. More...

Public Attributes
ByteBlock	code_data {}
	Downloaded software fragment. Padded with FF to 2048 bytes in binary section.
uint16_t	last_Lsection_number = 0
	DLT last section number (recreated on 16 bits).
uint16_t	Lsection_number = 0
	DLT section number (recreated on 16 bits).
uint8_t	maker_id = 0
	Manufacturer id.
uint8_t	model_id = 0
	Model id within manufacturer.
ByteBlock	model_info {}
	Model information. Padded with FF to 145 bytes in binary section.
uint8_t	version_id = 0
	Downloaded software id.

Static Public Attributes
static constexpr size_t	CODE_DATA_SIZE = 2048
	Fixed size in bytes of code_data in binary section.
static constexpr size_t	MODEL_INFO_SIZE = 145
	Fixed size in bytes of model_info in binary section.

Protected Member Functions
virtual bool	analyzeXML (DuckContext &, const xml::Element *) override
virtual void	buildXML (DuckContext &, xml::Element *) const override
virtual void	clearContent () override
virtual void	deserializePayload (PSIBuffer &, const Section &) override
virtual void	serializePayload (BinaryTable &, PSIBuffer &) const override
virtual bool	useTrailingCRC32 () const override

Detailed Description

Representation of an ISDB DownLoad Table (DLT).

See also

ARIB STD-B16, 4.4

Note: the ARIB STD-B16 is only in available in Japanese version and not generally available for download. The following is a summary of the structure of the DLT for the purpose of its implementation.

The DLT indicates the software to be downloaded. PID is operated by the operator and is indicated by DCT. It is transmitted in part (or all) of the transport_stream of the network. It is scrambled to ensure security. The frequency of transmission is set arbitrarily by the operator.

The DLT is a short section. However, the ARIB standard recreates 16-bit extended versions of section_number and last_section_number in the form of Lsection_number and last_Lsection_number. A CRC-32 is also explicitly added at the end of the section (just like a TOT).

Syntax                           Bits  Identifier
-------------------------------  ----  -------------
Download_section() {
  table_id                          8  uimsbf = 0xC1
  section_syntax_indicator          1  bslbf  = 0
  private_indicator                 1  bslbf  = 1
  reserved                          2  bslbf
  section_length                   12  uimsbf
  maker_id                          8  uimsbf
  model_id                          8  uimsbf
  version_id                        8  uimsbf
  Lsection_number                  16  uimsbf
  last_Lsection_number             16  uimsbf
  for (i=0;i<145;i++) {
    model_info                      8  bslbf
  }
  for (i=0;i<2048;i++) {
    code_data_byte                  8  bslbf
  }
  CRC_32                           32  rpchof
}

maker_id: This 8-bit field indicates the manufacturer identification of the receiver to which this section applies. This value is managed and operated by the standardization organization.

model_id: This 8-bit field indicates the model identification of the receiver to which this section applies, within the same maker_id. This value is managed and operated by each manufacturer.

version_id (software version identification): This 8-bit field indicates the software version identification of the receiver to which this section applies, within the same maker_id/model_id. This value is managed and operated by each manufacturer. Only one version_id is transmitted at the same time.

Lsection_number (extended section number): This 16-bit field is an extension of section_number to 16 bits, and indicates the number of the extended section. The extended section number of the first section in a subtable is 0x00. The extended section number is incremented by 1 for each additional section with the same table identification/manufacturer identification/model identification/software version identification.

last_Lsection_number (last extended section number): This 16-bit field is an extension of last_section_number to 16 bits, and specifies the number of the last section of the subtable to which the section belongs (i.e., the section with the highest extended section number).

model_info: This 145-byte field can contain any information related to the software.

code_data_byte (downloaded software): This 2048-byte field indicates the software to be downloaded.

CRC_32 (CRC): This 32-bit field is generated according to the CRC generation method section of the ISO/IEC13818-1 standard. It indicates the CRC value for the entire section.

Constructor & Destructor Documentation

DLT()

ts::DLT::DLT	(	DuckContext &	duck,
		const BinaryTable &	table
	)

Constructor from a binary table.

Parameters

[in,out]	duck	TSDuck execution context.
[in]	table	Binary table to deserialize.

Member Function Documentation

DisplaySection()

static void ts::DLT::DisplaySection ( ts::TablesDisplay &  display, const ts::Section &  section, ts::PSIBuffer &  payload, const ts::UString &  margin  )

static

A static method to display a section.

Parameters

[in,out]	display	Display engine.
[in]	section	The section to display.
[in,out]	payload	A PSIBuffer over the payload.
[in]	margin	Left margin content.

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

• tsDLT.h