DSMCC_SECTION Structure

The DSMCC_SECTION structure represents a DSM-CC section header. If a section contains a DSM-CC header, you can cast a SECTION pointer to a DSMCC_SECTION pointer. For more information, see the Remarks section in the SECTION reference.

Syntax

typedef struct {
  TID TableId;
  union {
    MPEG_HEADER_BITS_MIDL S;
    WORD W;
  } Header;
  WORD TableIdExtension;
  union {
    MPEG_HEADER_VERSION_BITS_MIDL S;
    BYTE B;
  } Version;
  BYTE SectionNumber;
  BYTE LastSectionNumber;
  BYTE ProtocolDiscriminator;
  BYTE DsmccType;
  WORD MessageId;
  DWORD TransactionId;
  BYTE Reserved;
  BYTE AdaptationLength;
  WORD MessageLength;
  BYTE RemainingData[1];
} DSMCC_SECTION, 
 *PDSMCC_SECTION;

Members

• TableId
  Specifies the table identifier (TID) of the section.

• Header
  A union that contains the following members.

  • S
    Contains packed header bits, as an MPEG_HEADER_BITS_MIDL structure. Applications should use the Header.W field instead.

  • W
    Contains the header bits as a WORD type. To get the individual bitfields, coerce this member to an MPEG_HEADER_BITS structure.

• TableIdExtension
  Specifies the table_id_extension field.

• Version
  A union that contains the following members.

  • S
    Contains the version number and current/next indicator bit as an MPEG_HEADER_VERSION_BITS_MIDL structure. Applications should use the Version.B field instead.

  • B
    Contains the version number and current/next indicator bit as a BYTE type. To get the individual bit fields, coerce this member to an MPEG_HEADER_VERSION_BITS structure.

• SectionNumber
  Specifies the section_number field, which gives the section number for this section.

• LastSectionNumber
  Specifies the last_section_number field, which gives the last (highest) section number for the table.

• ProtocolDiscriminator
  Indicates that the message is an MPEG-2 DSM-CC message. The value of this field is always 0x11.

• DsmccType
  Specifies the DSM-CC message type.

• MessageId
  Specifies the DSM-CC message identifier.

• TransactionId
  Specifies the transaction identifier.

• Reserved
  Reserved bytes.

• AdaptationLength
  Specifies the adaptation field length.

• MessageLength
  Specifies the message length.

• RemainingData
  Contains the remaining section data, as a byte array. The length of the array is Header.W.SectionLength - 17 bytes.

Remarks

This structure extends the LONG_SECTION structure.

Requirements

See Also

BDA Structures

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Build date: 12/4/2008