Optical Disc Data Block Grouping for Seamless 2D 3D Playback
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Solution Overview
Problem
Optical discs with multiple recording layers face challenges in seamless video playback due to long jumps required for data retrieval, leading to increased buffer requirements and duplication of data, especially when switching between 2D and 3D video playback.
Innovation Solution
A recording medium is designed with interleaved stream management, where main-view and sub-view data blocks are grouped into common and separate data block groups, allowing independent sizing of extents before long jumps and minimizing buffer capacity, while reducing duplicate data storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data blocks are arranged sequentially on multi-layer optical discs, then data retrieval is simple, but long jumps are required causing playback interruptions and increased buffer requirements
Solution Approach 1:
The patent segments data blocks into different groups (first data block group, second data block group, third data block group) and distributes them across different layers of the optical disc. This segmentation allows the system to retrieve data from multiple layers simultaneously or in a more efficient sequence, reducing the impact of long jumps and enabling smoother playback with reduced buffer requirements.
Solution Approach 2:
The patent utilizes the vertical dimension of multi-layer optical discs by strategically placing different data block groups on different layers. This dimensional approach transforms the traditional sequential single-layer retrieval into a multi-layer retrieval system, where data can be accessed from multiple levels, thereby reducing seek times and improving playback continuity.
2Adaptability or versatility
If duplicate data is stored for both 2D and 3D playback modes, then playback compatibility is ensured, but storage space is wasted and manufacturing costs increase
Solution Approach 1:
The patent merges the data storage for both 2D and 3D playback modes into a unified structure. By organizing data blocks into groups that can serve both playback modes (with the first data block group being accessible for both 2D and 3D playback), the system eliminates the need for complete duplication of data, thereby improving storage efficiency while maintaining playback compatibility.
Solution Approach 2:
The patent creates a universal data structure where certain data blocks (first data block group) can be used for both 2D and 3D playback modes. This multi-functional approach allows a single set of data to serve multiple purposes, ensuring that the optical disc is compatible with different playback modes without requiring separate duplicate data sets for each mode.
3Reliability
If extents are made large to prevent buffer underflow during long jumps, then seamless playback is achieved, but duplicate data storage increases
Solution Approach 1:
The patent segments extents into different groups corresponding to different data block groups. By creating separate extent groups (first extent group, second extent group, third extent group) that map to different layers and data blocks, the system can manage buffer requirements more efficiently without needing to create large duplicate extents, thereby reducing redundant data storage while maintaining seamless playback.
Data Source
AI summary
Provided is a recording medium that enables seamless connection between preceding playitems which are stream data arranged prior to a position where a long jump occurs, such as a layer boundary, and succeeding playitems which are stream data arranged subsequent to the position where the long jump occurs. A block exclusively for 2D playback Ln2D is arranged succeeding a 3D extent block in which a depth map data block, a right-view data block, and a left-view data block are arranged in an interleaved manner. A 3D extent block including a block exclusively for 3D playback L3SS is arranged between the block exclusively for 2D playback and a long jump point LB. The block exclusively for 2D playback and the block exclusively for 3D playback are identical in content.