Video transmission system and video relayer device

• US 8,196,173 B2
• Filed: 03/31/2010
• Issued: 06/05/2012
• Est. Priority Date: 03/31/2009
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Sawada, Junichi
• Primary Examiner(s): Huynh, Son P
• Application Number:
  US12/751,048
• Publication Number:
  US 20100251319A1
• Time in Patent Office: 797 Days
• Field of Search: 725/25, 725/31, 725/119
• US Class Current: 725/119
• CPC Class Codes: H04N 21/6583 Acknowledgement
• CPC Class Codes: H04N 21/8455 involving pointers to the content, e.g. pointers to the I-frames of the video stream

Abstract

A video relayer device includes a processing unit and a memory. The processing unit includes: a key information transfer section to transfer first key information to a video content sink upon receiving the first key information from a video content source having a timer, and a timer pausing section to control the timer of the sink to pause upon receiving the first key information from the source. The processing unit is operable to receive second key information and a calculation result from the sink and store the same, respectively in the memory. The processing unit further includes a timer resuming section to control the timer of the source to resume when the second key information and the calculation result have been stored, respectively, in the memory.

Claims

1. A video transmission system including a video content source that has a timer, a video content sink, and video relayer devices, at least one of the video relayer devices comprising:

a processing unit;

a memory to store a calculation result and second key information, the calculation result being produced by the video content sink based upon first key information, and the second key information being associated with a second key held by the video content sink;

the processing unit being configured to include, a key information transfer section to transfer first key information to the video content sink upon receiving the first key information from the video content source, the first key information being associated with a first key held by the video content source;

a timer pausing section to control the timer of the video content source to pause upon receiving the first key information from the video content source;

the processing unit being operable to receive the second key information and the calculation result from the video content sink and store the second key information and the calculation result, respectively, in the memory; and

the processing unit being further configured to include, a timer resuming section to control the timer of the video content source to resume when the second key information and the calculation result have been stored, respectively, in the memory,

wherein upon receiving the first key information from the video content source, the timer pausing section is further operable to notify the video content source that the video content source and the video content sink are not connected and to control the timer of the video content source to pause by turning off a hot-plug signal, and

wherein, when the second key information and the calculation result have been stored in the memory, respectively, the timer resuming section is further operable to notify the video content source that the video content source and the video content sink are connected and to control the timer of the video content source to resume by transmitting a hot-plug signal.

2. A non-transitory computer-readable medium comprising computer-executable instructions for performing a method, execution of which by the computer facilitates video transmission in circumstances of a video transmission system including a video content source that has a timer, a video content sink and a video relayer devices, the method including:

transferring by the video relayer device, first key information to the video content sink upon receiving the first key information from the video content source;

receiving second key information from the video content sink and storing the second key information, the second key information being associated with a key held by the video content sink;

pausing the timer of the video content source upon receiving the first key information from the video content source;

receiving a calculation result from the video content sink and storing the calculation result, the calculation result being a value produced by the video content sink based upon the first key information; and

controlling the timer of the video content source to resume when the second key information and the calculation result have been stored, respectively;

wherein pausing operation of the timer of the video content source includes turning off a hot-plug signal which indicates to the video content source that the video content source and the video content sink are not connected, and

wherein resuming operation of the timer of the video content source is resumed by transmitting a hot-plug signal to the video content source which indicates to the video content source that the video content source and the video content sink are connected.

3. A video relayer device comprising:

a processing unit;

a memory to store a calculation result and second key information, the calculation result being produced by an external video content sink based upon first key information, and the first key information being associated with a first key held by an external video content source; and

the processing unit being configured to include,

a key information transfer section to transfer first key information to the external video content sink upon receiving the first key information from the external video content source, and

a timer pausing section to control a timer of the external video content source to pause upon receiving the first key information from the external video content source;

the processing unit being operable to receive second key information and a calculation result from the external video content sink and store the second key information and the calculation result, respectively, in the memory; and

the processing unit being further configured to include,

a timer resuming section to control the timer of the external video content source to resume when the second key information and the calculation result have been stored, respectively, in the memory,

wherein the timer pausing section to control the timer of the external video content source includes turning off a hot-plug signal which indicates to the external video content source that the external video content source and the external video content sink are not connected, and

wherein the timer resuming section to control the timer of the external video content source to resume by transmitting a hot-plug signal to the external video content source which indicates to the external video content source that the external video content source and the external video content sink are connected.