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Method and apparatus for synchronization of data retrieval and presentation
| Details |
Inventors: Batson, James D.; Hoddie, J. Peter;
Assignee: Apple Computer, Inc. (Cupertino, CA)
Primary Examiner: Lee; Thomas C.
Assistant Examiner: Peyton; Tammara
Attorney, Agent or Firm: Blakely, Sokoloff, Taylor & Zafman
An apparatus for synchronizing data retrieval is described. The apparatus comprises a storage media storing data, a storage control device coupled to the storage media for retrieving the data from the storage media, memory coupled to the storage control device for storing the data; and a scheduling unit coupled to the memory for scheduling retrieval of the data from the storage media before a specified time. A storage media for storing computer instructions is also described. The storage media comprises a first plurality of processor executable instructions for instructing a computer system to schedule retrieval of data from a storage device before a specified time, a second plurality of processor executable instructions for instructing the computer system to retrieve the data from the storage device before the specified time has elapsed, a third plurality of processor executable instructions for instructing the computer system to store the data from the storage device into memory, and a fourth plurality of processor executable instructions for instructing the computer system to process the data from the memory. A method for synchronizing data retrieval in a data processing system is also described. The method comprises determining a specified time for retrieving the data from a storage media, scheduling retrieval of the data from the storage media before the specified time, retrieving the data from the storage media before the specified time has elapsed, and processing the data from the storage media. |
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DETAILED DESCRIPTION The present invention includes a method and an apparatus for synchronization of data retrieval; this data may be video and audio data which includes a sequence of frames of video data and corresponding audio data for each frame.
This synchronization method typically includes the steps of determining a specified time for retrieving data (e.
g.
a frame of video data and corresponding audio data) from a storage media and scheduling retrieval of the data from the storage media at or before the specified time.
At or before the specified time (e.
g.
the specified time has elapsed), the data is retrieved from the storage media and typically stored into a memory (for example a general purpose RAM of a computer system or a dedicated frame buffer).
The data is then typically processed in a conventional manner which may include reading the data out to a display device (e.
g.
CRT monitor) or (if the data is audio data) to a sound transducer (e.
g.
a speaker).
In one embodiment of the invention, the task of scheduling the retrieval of the data is implemented by creating a retrieval request and sorting pending retrieval requests.
The task of processing the data is implemented by determining a specified display time for displaying or otherwise presenting the data and scheduling a display (or presentation) interrupt to occur at the specified display time.
In one embodiment, the apparatus of the invention includes a storage media which stores the data (e.
g.
video frame data) and a storage control device which is coupled to the storage media to retrieve the data from the storage media.
The apparatus further includes a memory coupled to the storage control device in order to store the retrieved data and a scheduling unit which is coupled to the memory.
The scheduling unit may be, in one embodiment, a microprocessor programmed in a manner consistent with the present invention to schedule the retrieval of the data from the storage media at a specified time.
In one embodiment, the storage media may be a conventional CD-ROM or a magnetic hard disk media, and the storage control device may respectively be a CD-ROM controller or a hard-disk controller
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Processing Data 
