Optical recording medium to display stored command along with content, and apparatus and method to play the same

An apparatus to play an optical recording medium, the optical recording medium storing an identification code and a command in a reserved region in a stream of contents, the apparatus comprising:

• a signal processor to read the stream including the identification code and the command and the contents from the optical recording medium and to signal-process the stream to be displayed on a screen as streaming contents;
• and
• a controller to analyze the read stream and to determine whether the command is recorded in the reserved region, to display an indicator of the identification code along with the streaming contents, and to control the execution and display of the command if the command is recorded in the reserved region,
• wherein said controller determines whether the command is recorded in the reserved region based upon whether the identification code is recorded in the reserved region of the recording medium,
• wherein the command is one of a command to set predetermined parameters of the apparatus and another command to display information on a predetermined portion of the screen on which the contents are being displayed, and
• wherein:
• the command is to change the parameters to display a predetermined language in a subtitle to be displayed on the screen and to change the parameters to play an audio track of a predetermined language,
• the information displayed on the predetermined portion of the screen includes information on grammar related to the contents being displayed on the screen, and
• the information displayed on the predetermined portion of the screen includes information on phrases being conveyed using the contents being displayed on the screens,
• wherein said controller searches for the identification code and the command in the reserved region of one of a predetermined presentation control information (PCI) packet and a data search information (DSI) packet, which are used by the apparatus to play the optical recording medium.

A method of playing an optical recording medium, the method comprising:

• analyzing a signal, including a packet, read from the optical recording medium while displaying streaming content on a screen;
• determining whether a command is recorded in a reserved region of the packet;
• if the command is determined to be recorded in the reserved region, displaying an indicator of the command along with the streaming content and storing the command;
• executing the stored command when a command execution key is activated;
• and
• displaying a result of the executed command on the screen,
• wherein said determining whether the command is recorded in the reserved region comprises searching to determine whether a predetermined identification code is recorded in the reserved region in the packet,
• wherein the command is one of a command to set predetermined parameters of a system that plays the optical recording medium, and another command to display information on a predetermined portion of the screen,
• wherein:
• the command is to change the parameters to display a predetermined language in a subtitle to be displayed on the screen and to change the parameters to play an audio track of a predetermined language,
• the information displayed on the predetermined portion of the screen includes information on grammar related to the contents being displayed on the screen, and
• the information displayed on the predetermined portion of the screen includes information on phrases being conveyed using the contents being displayed on the screen, and
• wherein said determining whether the command is recorded in the reserved region includes searching for the identification code and the command in the reserved region of one of a predetermined presentation control information (PCI) packet and a data search information (DSI) packet, that are used to play the optical recording medium.

An apparatus to reproduce a received stream of contents, comprising:

• a signal processor to receive the stream and to process the stream to display the contents on a screen as streaming contents;
• a controller to analyze packets within the contents and to determine whether one of the packets contains a command in a reserved region of the one packet, to indicate that the command exists in the one packet using a predetermined portion of the screen while the contents are being displayed, and to execute the command,
• wherein:
• the one packet comprises a navigation (NV) packet in a video object unit (VOBU) of an MPEG stream, and
• said controller searches the reserved region of one of a presentation control information (PCI) and a data search information (DSI) to determine whether the NV packet contains the command,
• wherein the command is to display information on the predetermined portion of the screen while the contents are being displayed,
• wherein the command is to set parameters of the apparatus and the set parameters include one of an audio parameter and a subtitle parameter, and
• wherein:
• the command is to change the parameters to display a predetermined language in a subtitle to be displayed on the screen and to change the parameters to play an audio track of a predetermined language,
• the information displayed on the predetermined portion of the screen includes information on grammar related to the contents being displayed on the screen, and
• the information displayed on the predetermined portion of the screen includes information on phrases being conveyed using the contents being displayed on the screen.

A computer readable medium encoded with processing instructions for implementing a method of reproducing a received stream of contents to be displayed on a screen performed by a computer, the method comprising:

• analyzing a packet in the received stream while displaying the contents as streaming contents;
• determining whether a command is recorded in a reserved region of the packet;
• if the command is determined to be recorded in the reserved region, displaying an indicator of the command along with the streaming contents and storing the command;
• executing the stored command when an execution command is received;
• and
• outputting a result of the executed command to be displayed at a position on the screen along with a reproduced stream,
• wherein said determining whether the command is recorded comprises determining whether an identification code is recorded in the reserved region of the packet,
• wherein the command is one of a command to set predetermined parameters of a system that reproduces the stream, and another command to display information corresponding to the command at the position of the screen,
• wherein the executed command sets parameters of the reproduction of the stream, the set parameters including one of an audio parameter and a subtitle parameter,
• wherein:
• the command is to change the parameters to display a predetermined language in a subtitle to be displayed on the screen and to change the parameters to play an audio track of a predetermined language,
• the information displayed on the predetermined portion of the screen includes information on grammar related to the contents being displayed on the screen, and
• the result is a display of information including information about a phrase being conveyed in the reproduced stream to be displayed on the screen, and
• wherein:
• the packet is a navigation (NV) packet in a video object unit (VOBU) of an MPEG stream;
• and
• said analyzing the packet comprises searching in one of a presentation control information (PCI) and a data search information (DSI) to determine whether the NV packet contains the command.