POC value design for multi-layer video coding

Patent metadata

Field	Value
Publication number	US-9654774-B2
Application number	US-201414567762-A
Country	US
Kind code	B2
Filing date	Dec 11, 2014
Priority date	Dec 12, 2013
Publication date	May 16, 2017
Grant date	May 16, 2017

Abstract

In an example, a method of decoding video data includes decoding, by a video decoder, a first picture of multi-layer video data, where the first picture has a first picture type. The method also includes, based on the first picture having the first picture type, decoding, by the video decoder, data representative of picture order count (POC) most significant bits (MSB) value for the first picture.

First claim

What is claimed is:

1. A method of decoding video data, the method comprising:
decoding, by a video decoder, a first picture of a first layer of multi-layer video data, wherein the first picture has a first picture type;
based on the first picture having the first picture type, decoding, by the video decoder, data representative of picture order count (POC) most significant bits (MSB) value for the first picture;
determining a POC MSB delta value based on the data representative of the POC MSB value, the POC MSB delta value indicating an amount to decrement POC values of one or more pictures stored to a decoded picture buffer; and
decrementing the POC values of the one or more pictures stored to the decoded picture buffer by the POC MSB delta value.

2. The method of claim 1 , wherein decoding the data representative of the POC MSB value based on the first picture having the first picture type comprises:
determining whether the first picture type is included in a first set of picture types for which MSB values are coded or a second set of picture types for which MSB values are not coded; and
decoding the data representative of the POC MSB value for the picture only when the first picture type is included in the first set of picture types.

3. The method of claim 1 , further comprising, based on the data representative of the POC MSB for the first picture and without referencing a POC MSB value for a second picture of the multi-layer video data that precedes the first picture in coding order, determining the POC MSB for the first picture.

4. The method of claim 3 , further comprising constructing, by the video decoder, a reference picture list that includes the first picture having the determined POC MSB value.

5. The method of claim 1 , wherein the first picture type comprises at least one of a clean random access (CRA) picture or a broken link access (BLA) picture.

6. The method of claim 1 , wherein decoding the data representative of the POC MSB value for the first picture comprises decoding the data representative of the POC MSB value from a slice header extension.

7. The method of claim 1 , wherein decoding the data representative of the POC MSB value for the first picture comprises decoding a poc_msb_val syntax element.

8. The method of claim 1 , further comprising determining the first picture type based on a network abstraction layer (NAL) unit type of the first picture.

9. A method of encoding video data, the method comprising:
encoding, by a video encoder, a first picture of multi-layer video data, wherein the first picture has a first picture type; and
based on the first picture having the first picture type, encoding, by the video encoder, data representative of picture order count (POC) most significant bits (MSB) value for the first picture;
determining a POC MSB delta value based on the data representative of the POC MSB value, the POC MSB delta value indicating an amount to decrement POC values of one or more pictures stored to a decoded picture buffer; and
decrementing the POC values of the one or more pictures stored to the decoded picture buffer by the POC MSB delta value.

10. The method of claim 9 , wherein encoding the data representative of the POC MSB value based on the first picture having the first picture type comprises:
determining whether the first picture type is included in a first set of picture types for which MSB values are coded or a second set of picture types for which MSB values are not coded; and
encoding the data representative of the POC MSB value for the picture only when the first picture type is included in the first set of picture types.

11. The method of claim 9 , further comprising, based on the data representative of the POC MSB for the first picture and without referencing a POC MSB value for a second picture of the multi-layer video data that precedes the first picture in coding order, determining the POC MSB for the first picture.

12. The method of claim 11 , further comprising constructing, by the video encoder, a reference picture list that includes the first picture having the determined POC MSB value.

13. The method of claim 9 , wherein the first picture type comprises at least one of a clean random access (CRA) picture or a broken link access (BLA) picture.

14. The method of claim 9 , wherein encoding the data representative of the POC MSB value for the first picture comprises encoding the data representative of the POC MSB value in a slice header extension.

15. The method of claim 9 , wherein encoding the data representative of the POC MSB value for the first picture comprises decoding a poc_msb_val syntax element.

16. The method of claim 9 , further comprising determining the first picture type based on a network abstraction layer (NAL) unit type of the first picture.

17. A device for coding video data, the device comprising:
a memory configured to store multi-layer video data; and
a video coder configured to:
code a first picture of the multi-layer video data, wherein the first picture has a first picture type;
based on the first picture having the first picture type, code data representative of picture order count (POC) most significant bits (MSB) value for the first picture;
determine a POC MSB delta value based on the data representative of the POC MSB value, the POC MSB delta value indicating an amount to decrement POC values of one or more pictures stored to a decoded picture buffer; and
decrement the POC values of the one or more pictures stored to the decoded picture buffer by the POC MSB delta value.

18. The device of claim 17 , wherein to code the data representative of the POC MSB value based on the first picture having the first picture type, the video coder is configured to:
determine whether the first picture type is included in a first set of picture types for which MSB values are coded or a second set of picture types for which MSB values are not coded; and
code the data representative of the POC MSB value for the picture only when the first picture type is included in the first set of picture types.

19. The device of claim 17 , wherein the video coder is further configured to, based on the data representative of the POC MSB for the first picture and without referencing a POC MSB value for a second picture of the multi-layer video data that precedes the first picture in coding order, determine the POC MSB for the first picture.

20. The device of claim 19 , wherein the video coder is further configured to construct a reference picture list that includes the first picture having the determined POC MSB value.

21. The device of claim 17 , wherein the first picture type comprises at least one of a clean random access (CRA) picture or a broken link access (BLA) picture.

22. The device of claim 17 , wherein to code the data representative of the POC MSB value for the first picture, the video coder is configured to code the data representative of the POC MSB value from a slice header extension.

23. The device of claim 17 , wherein the device comprises at least one of:
an integrated circuit;
a microprocessor; or
a wireless communication device.

24. A device for coding video data, the device comprising:
means for coding a first picture of multi-layer video data, wherein the first picture has a first picture type;
means for coding, based on the first picture having the first picture type, data representative of picture order count (POC) most signific

Assignees

• Qualcomm Inc

Inventors

• Hendry Fnu
• Wang Ye-Kui
• Ramasubramonian Adarsh Krishnan

Classifications

• H04N19/114

  Adapting the group of pictures [GOP] structure, e.g. number of B-frames between two anchor frames (H04N19/107 takes precedence) · CPC title

• H04N19/103 Primary

  Selection of coding mode or of prediction mode · CPC title

• H04N19/90

  using coding techniques not provided for in groups H04N19/10-H04N19/85, e.g. fractals · CPC title

• H04N19/44

  Decoders specially adapted therefor, e.g. video decoders which are asymmetric with respect to the encoder · CPC title

• H04N19/70

  characterised by syntax aspects related to video coding, e.g. related to compression standards · CPC title