Liberate Technologies, Inc.

Paul Ernest McRae

Antoine Boucher

Peter G N Scheyen

Tong Qiu

Various embodiments of the invention provide increased speed and decreased computer processing for playing and navigating multimedia content by using two types of data objects for displaying the multimedia content. The first data object type includes rendered multimedia content data. The second data object type provides semantic content corresponding to the rendered multimedia content. The storage medium in which these two types of data objects are contained is referred to as a rendered cache. The semantic content can include locations, sizes, shapes, and target universal resource identifiers of hyperlinks, multimedia element timing, and other content play instructions. The very fast play of content stored in the rendered cache is due to the elimination of the steps of laying out the content, rendering the content, and generating the semantic representation of the content. These steps are required each time the content is played after retrieval from a conventional cache. The only steps required for playing content from the rendered cache are to read the rendered content, read the semantic content, restore the semantic representation, and play the content. A traditional web browser visiting a web site that resides in a rendered cache provides an almost instantaneous display of the web site. The caching mechanism provided by various embodiments of the invention is independent of content file format and the stored semantic content file format. As long as a client application, such as a content browser, can recognize and play the multimedia content and recognize and interpret the semantic content, the application can realize the benefits provided by the rendered cache.

Methods, apparatus, and systems for storing, retrieving and playing multimedia data

Various embodiments of the invention provide increased speed and decreased computer processing for playing and navigating multimedia content by using two types of data objects for displaying the multimedia content. The first data object type includes rendered multimedia content data for a rendered cache, or rendering instructions for a paint stream cache or a layout cache. The paint stream cache and layout cache can take advantage of increased client processing capabilities. The second data object type provides semantic content corresponding to the rendered multimedia content. The storage medium in which these two types of data objects are contained is referred to as a rendered cache. The semantic content can include locations, sizes, shapes, and target universal resource identifiers of hyperlinks, multimedia element timing, and other content play instructions. The very fast play of content stored in the rendered cache is due to the elimination of the steps of laying out the content, rendering the content, and generating the semantic representation of the content. These steps are required each time the content is played after retrieval from a conventional cache. The only steps required for playing content from the rendered cache are to read the rendered content, read the semantic content, restore the semantic representation, and play the content. The caching mechanism provided by various embodiments of the invention is independent of content file format and the stored semantic content file format.

Systems and methods are described for preparing multimedia data using digital video data compression. Various embodiments of the invention use pre-rendering and encoding techniques that format the video image data into fat macroblocks. The fat macroblocks include header information that identifies the beginning locations of strips of macroblocks representing slices of the image, and of the macroblocks disposed within the strips. The header information enables macroblocks disposed in a strip of fat macroblocks to be individually addressed thereby providing transmission bandwidth, data processing, and data storage advantages for preparing and transmitting data for updating video images including less than full screen motion. The advantages are achieved in part because updates only require that the first macroblock of each strip of macroblocks be transmitted. Further efficiencies can be realized by using a zero displacement motion vector instead of the actual values of the first macroblock if the first macroblock is not changing. Methods using fat macroblock formatted data sets provide advantages for encoding and transmitting large bitmaps of static content, scrolling the static content, enabling animation of small areas of the display, supporting picture-in picture functionality, and allowing for overlay and combination of different image data from different sources on the display. The methods of preparing the multimedia data include pre-rendering a bitmap to create a compressed form of the bitmap, and determining a viewable area of the video images to be displayed. The viewable area of the video images can be smaller than the full-sized area of the video images.

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London, Canada

Paul Ernest McRae