MPD Metafile Spatial Layout Control for DASH Streaming
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Solution Overview
Problem
Current Dynamic Adaptive Streaming over HTTP (DASH) systems lack attributes to describe spatial layout and target display device types, making content presentation layout control complex and requiring additional layers like HTML5 for presentation control.
Innovation Solution
A transmission apparatus and method that includes a metafile with acquisition information and reference information for presentation control, using extended MPD files and SMIL elements to facilitate easy content presentation layout control across various devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If presentation control information is stored in separate files or layers (HTML5, SMIL), then the metafile remains simple and lightweight, but additional layers and files are required making authoring complex
Solution Approach 1:
The patent merges presentation control information directly into the MPD metafile by adding new XML elements and attributes. Specifically, it introduces `<Presentation>` elements with `<Region>` definitions and `<Viewport>` specifications within the MPD structure, allowing spatial layout and device targeting to be embedded in the same file that contains acquisition information, eliminating the need for separate HTML5 or SMIL layers
Solution Approach 2:
The MPD file is enhanced to serve multiple functions simultaneously: it continues to provide acquisition information for data streams while also incorporating presentation control capabilities. The extended MPD structure can describe both content delivery metadata and spatial layout requirements, making a single file sufficient for both purposes
2Ease of operation
If spatial layout and device type attributes are added to the metafile, then presentation layout control becomes easier, but the metafile structure becomes more complex
Solution Approach 1:
The presentation control information is segmented into distinct hierarchical elements within the MPD structure. The `<Presentation>` element contains `<Region>` elements for spatial definitions and `<Viewport>` elements for device targeting, allowing complex presentation control to be broken down into manageable, organized components that maintain the XML structure's readability and parseability
Solution Approach 2:
The patent adds a new dimensional layer to the MPD structure by introducing spatial coordinates (x, y positions) and region definitions. This extends the traditional one-dimensional stream selection model into a two-dimensional spatial layout model, enabling precise control over content placement on display screens while maintaining compatibility with existing MPD parsing through structured XML extensions
Data Source
AI summary
[Object] To cause presentation layout control of a content to be performed with ease.[Solving Means] A metafile is received by a reception section. The metafile includes acquisition information used for a client terminal to acquire a predetermined number of data streams of a content that can be delivered by a delivery server via a network. The metafile also includes reference information for referencing a file including presentation control information for performing presentation control of the content or the presentation control information for performing presentation control of the content. A processing section carries out processing based on the received metafile.