System and method for timestamps for media stream data

• US 20070005794A1
• Filed: 06/30/2006
• Published: 01/04/2007
• Est. Priority Date: 07/01/2005
• Status: Active Grant

• Current Assignee: Winnov, L.P.
• Original Assignee: Winnov, L.P.
• Inventors: Graham, Harry
• Granted Patent: US 8,179,789 B2
• Time in Patent Office: Days
• US Class Current: 709/231
• CPC Class Codes: H04L 65/1101 Session protocols
• CPC Class Codes: H04L 65/80 Responding to QoS

Abstract

Within a computer system, a system and method of providing timestamps for media stream input data is provided. A first clock count register is responsive to a first timebase, and a second clock count register is responsive to a second timebase. The first and second time bases can be correlated. When a frame of media stream input data is captured, the value of the first clock count register can be preserved. This value is a timestamp expressed in terms of the first timebase. The timestamp value in terms of the second timebase is computed and associated with the captured frame of media stream input data.

Claims

1. In a computer system having a media stream input, a system for providing timestamps within media stream input data comprising:

a media sample time register;

a first clock circuit comprising a first clock count register;

a second clock circuit comprising a second clock count register;

means for associating a timestamp value with media stream input data; and

means for storing the timestamp value with the media stream input data.

2. In a computer system having a media stream input node, a method of providing timestamps for media stream input data comprising the steps of:

providing a media sample time register;

providing a first clock circuit comprising a first clock count register disposed with a first timebase;

providing a second clock circuit comprising a second clock count register disposed with a second timebase;

capturing a frame of media stream input data;

loading the media sample time register from the first clock count register responsive to the capture of the frame of media stream input data;

reading a media sample time value from the media sample time register;

correlating the first timebase with the second timebase;

computing a timestamp value in terms of the second timebase, responsive to the media sample time value, responsive to the capture of the frame of media stream input data, and responsive to the correlation of the first timebase with the second timebase; and

associating the timestamp value that is in terms of the second timebase with the captured frame of media stream input data.

3. The method of claim 2, further comprising the steps of:

providing a PCI system clock; and

disposing the first timebase as responsive to the PCI system clock.

4. The method of claim 2, further comprising the steps of:

providing an audio sample clock; and

disposing the first timebase as responsive to the audio sample clock.