File format for multiple track digital data

摘要

A file for storing digital data with high compression rate stores digital data for video and audio signals in multiple streams interleaved with each other. Each track has a stream descriptor list and a stream data list. The stream descriptor list includes a stream header chunk, a stream format chunk, and a stream name chunk. For a video stream, the stream descriptor list also includes a stream header data chunk if the video stream is under digital rights management (DRM) protection. The file format is compatible with high level data compressing algorithms, such as MPEG-4, which provide data compression ratio about six to ten times higher than a standard DVD format.

主权项

1. A playback device configured to play data encoded in a multimedia file, comprising:
a processor configured to read the multimedia file; wherein the multimedia file has at least one video track and includes a video stream descriptor list comprising:
a video stream header chunk;a video stream format chunk following said video stream header chunk; anda video stream name chunk including a string indicating a video stream in said at least one video track;said video stream descriptor list further comprising a video stream header data chunk in response to said at least one video track being a digital rights management (DRM) protected video, said video stream header data chunk following said video stream format chunk in said video stream descriptor list;said video stream header data chunk in said video stream descriptor list including a DRM information data block comprising:
a first member specifying a version of the DRM; anda second member specifying a protection of the DRMsaid DRM information data block in said video stream header data chunk having a data structure defined as:typedef_DRMinfo {WORD wVersion;STR sDRMinfo;} DRMINFO.