Method and apparatus for transmitting compressed data using digital data interface, and method and apparatus for receiving compressed data using digital data interface

A method of transmitting media data from a source apparatus to a synchronization apparatus via a digital data interface of the synchronization apparatus, the method comprising:

• receiving display-related information in a data structure transceivable via the digital data interface from the synchronization apparatus;
• extracting information about a playback capability of the synchronization apparatus from the received display-related information;
• extracting information about a compressed data playback capability of the synchronization apparatus from the information about the playback capability of the synchronization apparatus;
• compressing raw data based on the extracted information about the compressed data playback capability of the synchronization apparatus;
• forming a media data structure, in a data structure transceivable via the digital data interface, comprising compressed data obtained by compressing raw data;
• inserting ancillary data for the raw data into an ancillary data field included in the media data structure;
• inserting compression-related information about the compressed data into the ancillary data field of the media data structure;
• and
• transmitting the media data from the source apparatus to the synchronization apparatus via the digital data interface.

An apparatus for receiving media data via a digital data interface of a synchronization apparatus from a source apparatus, the apparatus comprising:

• a display-related information generation unit which generates the display-related information about a playback capability of the synchronization apparatus in a data structure transceivable via the digital data interface;
• a compressed data playback capability information insertion unit which inserts information about a compressed data playback capability of the synchronization apparatus into the display-related information;
• a display-related information transmission unit which transmits the display-related information from the synchronization apparatus to the source apparatus via the digital data interface;
• a media data parsing unit which receives and parses the media data from the source apparatus via the digital data interface, wherein the source apparatus selects the media data based on the display-related information and generates the media data in a data structure transceivable via the digital data interface;
• a compression-related information extraction unit which extracts compression-related information about compressed data obtained by compressing raw data, from an ancillary data field of the parsed media data, wherein ancillary data for the raw data has been inserted into the ancillary data field;
• a compressed data extraction unit which extracts the compressed data from the parsed media data;
• and
• a decoding unit which decodes the compressed data by using the compression-related information.

An apparatus for transmitting media data from a source apparatus to a synchronization apparatus via a digital data interface of the synchronization apparatus, the apparatus comprising:

• a display-related information receiving unit which receives display-related information in a data structure transceivable via the digital data interface from the synchronization apparatus;
• a display-related information extracting unit which extracts information about a playback capability of the synchronization apparatus from the received display-related information, and extracts information about a compressed data playback capability of the synchronization apparatus from the information about the playback capability of the synchronization apparatus;
• a compression unit which compresses raw data based on the extracted information about the compressed data playback capability of the synchronization apparatus;
• a media data structure formation unit which forms a media data structure, in a data structure transceivable via the digital data interface, into which compressed data obtained by compressing raw data has been inserted;
• an ancillary data insertion unit which inserts ancillary data for the raw data into an ancillary data field included in the media data structure;
• and
• a compression-related information insertion unit which inserts compression-related information about the compressed data into the ancillary data field of the media data structure;
• and
• a media data transmission unit which transmits the media data from the source apparatus to the synchronization apparatus via the digital data interface.

A system for transmitting display-related information, the system comprising:

• a synchronization apparatus connected to a source apparatus via a digital data interface, the synchronization apparatus comprising:
• a display-related information generation unit which generates the display-related information into which information about a playback capability of the synchronization apparatus has been inserted, and
• a display-related information transmission unit which transmits the display-related information to the source apparatus via the digital data interface, and
• a source apparatus comprising:
• a display-related information parsing unit which parses the display-related information transmitted from the synchronization apparatus, and
• a media data determination unit which determines compressed data to be transmitted to the synchronization unit via the digital data interface, based on the display-related information.