Optical Disc Data Structure for Multi-Stream Management
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Solution Overview
Problem
Current data management structures for high-density read-only optical disks like Blu-ray ROM lack an effective method to manage multiple component data streams, hindering efficient reproduction and recording of video, audio, and other data streams.
Innovation Solution
A data structure on the recording medium includes a navigation area with a stream indication field that identifies associated data streams, allowing for the efficient selection and reproduction of multiple data streams by using unique packet identifiers (PIDs) for video, audio, and other elementary streams, enabling the management of various reproduction paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a traditional file structure is used for managing data streams on high-density optical disks, then the data organization is simple, but the ability to efficiently manage and reproduce multiple component data streams is insufficient
Solution Approach 1:
The patent segments the data structure into distinct functional areas: navigation area containing playlist files with playitem information, clip information files with sequence and program data, and stream directory with multiplexed data streams. Each segment handles specific aspects of multi-stream management, enabling efficient organization and reproduction of multiple component data streams while maintaining manageable complexity through functional separation
Solution Approach 2:
The patent introduces intermediary files and structures that mediate between the physical data streams and the reproduction process. Clip information files act as intermediaries that map playitems to specific data streams and sequences. Playlist files serve as intermediaries that define reproduction paths by selecting specific playitems. These intermediary structures enable flexible management of multiple data streams without requiring direct complex control of the underlying stream data
2Adaptability or versatility
If multiple data streams are recorded on the optical disk, then the data capacity and functionality are enhanced, but the complexity of selecting and reproducing specific streams increases
Solution Approach 1:
The patent implements preliminary action by pre-defining reproduction paths through playlist files that contain sequences of playitems. Each playitem is pre-configured with IN-point and OUT-point timestamps and associated data stream identifiers. Clip information files pre-establish the mapping between playitems and specific data streams with sequence information including arrival time basis and system time basis. This preliminary organization allows the reproduction system to simply follow pre-defined paths without complex real-time selection logic
Solution Approach 2:
The patent uses intermediary structures to simplify stream selection. Playlist files act as intermediaries that abstract the complexity of multiple data streams by providing high-level reproduction paths. Playitems serve as intermediaries that link user-selected reproduction scenarios to specific clip files and data streams. Clip information files act as intermediaries that map playitem identifiers to actual stream locations and timing information. This multi-layer intermediary structure shields the reproduction logic from the complexity of managing multiple raw data streams
Data Source
AI summary
The data structure on the recording medium includes a navigation area storing at least one playitem in a playlist. The playitem includes a stream indication field indicating the data streams associated with the playitem. For example, the stream indication field indicates the packet identifiers of the data streams associated with the playitem.