DISPLAY STREAM COMPRESSION

• US 20140362098A1
• Filed: 06/10/2013
• Published: 12/11/2014
• Est. Priority Date: 06/10/2013
• Status: Abandoned Application

• Current Assignee: Sharp Laboratories of America Incorporated (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Laboratories of America Incorporated (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Kerofsky, Louis J.
• Application Number:
  US13/914,314
• Publication Number:
  US 20140362098A1
• Time in Patent Office: Days
• US Class Current: 345/547
• CPC Class Codes: G06T 1/60 Memory management
• CPC Class Codes: H04N 19/40 using video transcoding, i.e. partial or full decoding of a coded input stream followed by re-encoding of the decoded output stream
• 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 19/507 using conditional replenishment

Abstract

A method for video coding is described. A compressed bitstream is received from a host via a data link. Each slice of the compressed bitstream is mapped to a compressed frame buffer. The compressed frame buffer supports selective overwriting for regional updates. Parallel processing of the compressed data in the compressed frame buffer is performed. Pixel data is written to a display panel.

Claims

1. A method for video decoding, comprising:

receiving a compressed bitstream from a host via a data link;

mapping each slice of the compressed bitstream to a compressed frame buffer, wherein the compressed frame buffer supports selective overwriting for regional updates;

performing parallel processing of the compressed data in the compressed frame buffer; and

writing pixel data to a display panel.

2. The method of claim 1, wherein slice data is interleaved for transmission.

3. The method of claim 2, wherein slice data is provided to each decoder without buffering compressed data.

4. The method of claim 1, wherein the transmission of compressed data uses scheduling to avoid collisions between mapping slices to the compressed frame buffer and decoding slices from the compressed frame buffer.

5. The method of claim 4, wherein a decoder begins decoding a frame from the compressed frame buffer after an offset from the beginning of a frame time.

6. The method of claim 5, wherein the decoder operates on slices in raster scan at a uniform rate until the end of the frame.

7. The method of claim 1, wherein the method is performed by a mobile device.

8. The method of claim 5, wherein the method is performed by a display stream compression decoder on the mobile device.

9. The method of claim 1, wherein the compressed frame buffer is linear.

10. The method of claim 1, wherein a compressed slice location list is maintained for the compressed frame buffer.

11. The method of claim 10, wherein the compressed slice location list comprises a start time for each slice, an end time for each slice and a location of the slice within the compressed frame buffer.

12. The method of claim 1, wherein regional updates are implemented when a limited number of full slices of compressed data are received.

13. The method of claim 1, wherein regional updates comprise the location of a slice, a size of the slice and where the slice is located in the compressed frame buffer.

14. The method of claim 1, wherein the compressed frame buffer comprises reserved space for each slice based on slice geometry and a maximum size of each slice.

15. The method of claim 1, wherein content and transmission of the compressed bitstream are constrained by multiple hypothetical reference decoders (HRDs), wherein the arrival of bits in an ith HRD are delayed by

16. The method of claim 15, wherein bits arrive at an HRD at a uniform rate of R/M bits per pixel time P.

17. An electronic device, comprising:

a compressed buffer, wherein the compressed buffer supports selective overwriting for regional updates;

a slice mapper that maps a compressed bitstream to the compressed buffer;

one or more decoders that perform parallel processing of compressed data from the compressed buffer; and

a display panel that displays decoded data.

18. The electronic device of claim 17, wherein slice data is interleaved during transmission.

19. The electronic device of claim 18, wherein slice data is provided to each decoder without buffering compressed data.

20. The electronic device of claim 17, wherein the transmission of compressed data uses scheduling to avoid collisions between mapping slices to the compressed frame buffer and decoding slices from the compressed frame buffer.

21. The electronic device of claim 20, wherein each decoder begins decoding a frame from the compressed frame buffer after an offset from the beginning of a frame time.

22. The electronic device of claim 21, wherein the one or more decoders operate on slices in raster scan at a uniform rate until the end of the frame.

23. The electronic device of claim 17, wherein the electronic device is a mobile device.

24. The electronic device of claim 23, wherein the mobile device comprises a display stream compression decoder.

25. The electronic device of claim 17, wherein the compressed frame buffer is linear.

26. The electronic device of claim 17, wherein a compressed slice location list is maintained for the compressed frame buffer.

27. The electronic device of claim 26, wherein the compressed slice location list comprises a start time for each slice, an end time for each slice and a location of the slice within the compressed frame buffer.

28. The electronic device of claim 17, wherein regional updates are implemented when a limited number of full slices of compressed data are received.

29. The electronic device of claim 17, wherein regional updates comprise the location of a slice, a size of the slice and where the slice is located in the compressed frame buffer.

30. The electronic device of claim 17, wherein the compressed frame buffer comprises reserved space for each slice based on slice geometry and a maximum size of each slice.

31. The electronic device of claim 17, wherein content and transmission of the compressed bitstream are constrained by multiple hypothetical reference decoders (HRDs), wherein the arrival of bits in an ith HRD are delayed by

32. The electronic device of claim 31, wherein bits arrive at an HRD at a uniform rate of R/M bits per pixel time P.