Optical Disc Navigation Data Structure for Playback Path Management
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Solution Overview
Problem
There is a lack of an effective data structure for managing the reproduction of video and audio data on high-density read-only optical disks, such as Blu-ray ROM, which limits the ability to efficiently navigate and control playback of multiple reproduction paths, including parental control and camera angles.
Innovation Solution
A data structure is introduced that includes a navigation area with navigation files and command groups, allowing for the management of multiple reproduction paths by determining which playlists to playback based on user input, and includes a length indicator, attribute indicator, and number of navigation command groups, enabling seamless switching between different reproduction paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a data structure for managing reproduction of video and audio data is implemented on high-density optical disks, then the ability to navigate and control playback of multiple reproduction paths is improved, but the device complexity increases due to the need for navigation files, command groups, and additional data structures
Solution Approach 1:
The navigation data structure is segmented into distinct components: navigation files containing command groups, attribute indicators, and length indicators. Each segment serves a specific function in managing reproduction paths, allowing the system to handle complexity in an organized manner while providing versatile playback control
Solution Approach 2:
Navigation files act as intermediary structures between the physical data storage and the playback control logic. These files contain command groups that mediate between user input and the actual reproduction path selection, simplifying the interface between user control and complex playback management
2Ease of operation
If navigation files with command groups are used to manage multiple reproduction paths, then the ease of operation is improved through user input-based playlist selection, but the loss of information increases due to the need for additional metadata and navigation structures
Solution Approach 1:
Navigation files are prepared in advance with pre-defined command groups that encode reproduction path logic. Attribute indicators and length indicators are predetermined, allowing the playback system to operate easily by simply following pre-prepared instructions rather than making complex decisions during playback
Solution Approach 2:
The navigation structure creates a logical copy or representation of the reproduction paths in the form of command groups. This virtual representation allows easy manipulation and selection of playback paths without directly modifying the actual video and audio data, preserving the original information while enabling flexible control
Data Source
AI summary
The recording medium has a navigation area storing at least one navigation file. The navigation file includes navigation commands for managing reproduction of at least video data forming different parental control reproduction paths.