Video processing system for scrambling layered video streams and methods for use therewith

• US 8,144,781 B2
• Filed: 01/04/2008
• Issued: 03/27/2012
• Est. Priority Date: 01/04/2008
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Gordon, Stephen E., Chen, Sherman (Xuemin), Dove, Michael, ROSMANN, DAVID, Quigley, Thomas J., Karaoguz, Jeyhan
• Primary Examiner(s): Duong, Frank
• Application Number:
  US11/969,299
• Publication Number:
  US 20090175329A1
• Time in Patent Office: 1,544 Days
• Field of Search: 375240-24002, 37524008-24016, 375/240.28, 380/240, 713/151
• US Class Current: 375/240.16
• CPC Class Codes: H04N 19/187 the unit being a scalable video layer
• CPC Class Codes: H04N 19/30 using hierarchical techniques, e.g. scalability H04N19/63 takes precedence
• CPC Class Codes: H04N 19/42 characterised by implementation details or hardware specially adapted for video compression or decompression, e.g. dedicated software implementation H04N19/635 takes precedence
• CPC Class Codes: H04N 19/423 characterised by memory arrangements H04N19/433 takes precedence
• CPC Class Codes: H04N 19/44 Decoders specially adapted therefor, e.g. video decoders which are asymmetric with respect to the encoder
• CPC Class Codes: H04N 21/234327 by decomposing into layers, e.g. base layer and one or more enhancement layers
• CPC Class Codes: H04N 21/23476 by partially encrypting, e.g. encrypting the ending portion of a movie
• CPC Class Codes: H04N 7/1675 Providing digital key or authorisation information for generation or regeneration of the scrambling sequence pseudo-random number generators in general G06F7/58

Abstract

A video processing system includes a video encoder that encodes a video stream into an independent video layer stream and a first dependent video layer stream that requires the independent video layer for decoding. A scrambling module scrambles the independent video layer stream to produce a scrambled independent video layer stream and leaves the first dependent video layer stream unscrambled.

Claims

1. A video processing system comprising:

a device that includes;

a video encoder that encodes a video stream into an independent video layer stream and a first dependent video layer stream that requires the independent video layer stream for decoding wherein the independent video layer stream includes a first plurality of motion vector data corresponding to a plurality of motion vectors, the first plurality of motion vector data representing a plurality of most significant bits of each of the plurality of motion vectors, wherein the first dependent video layer stream includes a second plurality of motion vector data corresponding to the plurality of motion vectors, the second plurality of motion vector data representing a plurality of least significant bits of each of the plurality of motion vectors, and wherein the second video layer stream does not include the first plurality of motion vector data; and

a scrambling module, coupled to the video encoder, that scrambles the independent video layer stream to produce a scrambled independent video layer stream and leaves the first dependent video layer stream unscrambled.

2. The video processing system of claim 1 wherein the scrambling module encrypts the independent video layer stream.

3. The video processing system of claim 1 wherein the scrambling module identifies the coding-type of the independent video layer stream.

4. The video processing system of claim 1 wherein the video encoder further encodes the video stream into a second dependent video layer stream, and wherein the scrambling module further leaves the second dependent video layer stream unscrambled.

5. The video processing system of claim 1 further comprising:

a descrambling module, coupled to receive the scrambled independent video layer stream, that descrambles the scrambled independent video layer stream to produce a descrambled independent video layer stream.

6. The video processing system of claim 5 further comprising:

a video decoder that, in a first mode of operation is coupled to receive the descrambled independent video layer stream and the first dependent video layer stream, to synchronize the descrambled independent video layer stream and the first dependent video layer stream to form a synchronized stream and to generate a reconstructed video signal based on the synchronized stream.

7. The video processing system of claim 6 wherein the video decoder, in a second mode of operation, is coupled to receive the descrambled independent layer stream, and to generate a reconstructed video signal based on the descrambled independent layer stream, without the first dependent video layer stream.

8. The video processing system of claim 1 wherein the independent video layer stream includes a plurality of grayscale data, wherein the first dependent video layer stream includes a plurality of color data, and wherein the second video layer stream does not include the plurality of grayscale data.

9. A video processing system comprising:

a device that includes;

a video encoder that encodes a video stream into an independent video layer stream and a first dependent video layer stream that requires the independent video layer stream for decoding;

a scrambling module, coupled to the video encoder, that scrambles the first dependent video layer stream to produce a scrambled first dependent video layer stream and leaves the independent dependent video layer stream unscrambled; and

a descrambling module, coupled to receive the scrambled dependent video layer stream, that descrambles the scrambled first dependent video layer stream to produce a descrambled first dependent video layer stream.

10. The video processing system of claim 9 wherein the scrambling module encrypts the first dependent video layer stream.

11. The video processing system of claim 9 wherein the scrambling module identifies the coding-type of the first dependent video layer stream.

12. The video processing system of claim 9 wherein the video encoder further encodes the video stream into a second dependent video layer stream, and wherein the scrambling module further scrambles the second dependent video layer stream.

13. The video processing system of claim 9 further comprising:

a video decoder that, in a first mode of operation is coupled to receive the descrambled first dependent video layer stream and the independent video layer stream, to synchronize the descrambled first dependent video layer stream and the independent video layer stream to form a synchronized stream and to generate a reconstructed video signal based on the synchronized stream.

14. A method comprising:

encoding a video stream via a video encoder device into an independent video layer stream and a first dependent video layer stream that requires the independent video layer stream for decoding wherein the independent video layer stream includes a first plurality of motion vector data corresponding to a plurality of motion vectors, the first plurality of motion vector data representing a plurality of most significant bits of each of the plurality of motion vectors, wherein the first dependent video layer stream includes a second plurality of motion vector data corresponding to the plurality of motion vectors, the second plurality of motion vector data representing a plurality of least significant bits of each of the plurality of motion vectors, and wherein the second video layer stream does not include the first plurality of motion vector data; and

scrambling the independent video layer stream via a scrambling device to produce a scrambled independent video layer stream while leaving the first dependent video layer stream unscrambled.

15. The method of claim 14 wherein scrambling the independent video layer stream includes encrypting the independent video layer stream.

16. The method of claim 14 wherein encoding the video stream into the independent video layer stream further includes encoding the video stream into a second dependent video layer stream, and wherein scrambling the independent video layer stream further leaves the second dependent video layer stream unscrambled.

17. The method of claim 14 further comprising:

receiving the scrambled independent video layer stream; and

descrambling the scrambled independent video layer stream to produce a descrambled independent video layer stream.

18. The method of claim 17 further comprising:

when in a first mode of operation;

receiving the descrambled independent video layer stream and the first dependent video layer stream;

synchronizing the descrambled independent video layer stream and the first dependent video layer stream to form a synchronized stream; and

generating a reconstructed video signal based on the synchronized stream.

19. The method of claim 18 further comprising

when in a second mode of operation:

receiving the descrambled independent video layer stream; and

generating a reconstructed video signal based on the descrambled independent layer stream, without the first dependent video layer stream.

20. The method of claim 14 wherein the independent video layer stream includes a plurality of grayscale data, wherein the first dependent video layer stream includes a plurality of color data, and wherein the second video layer stream does not include the plurality of grayscale data.