1. A method of decoding video data, the method comprising:', 'decapsulating a slice of a random access point (RAP) picture of a bitstream from a network abstraction layer (NAL) unit, wherein the NAL unit includes a NAL unit type value that indicates whether the RAP picture is of a type that can have associated leading pictures and whether the RAP picture is an instantaneous decoder refresh (IDR) picture or a clean random access (CRA) picture;', 'determining whether the RAP picture can have associated leading pictures based on the NAL unit type value; and', 'decoding video data of the bitstream following the RAP picture based on the determination of whether the RAP picture can have associated leading pictures.

2. The method of claim 1 , wherein the NAL unit type value indicates that the RAP picture comprises the CRA picture, wherein determining comprises determining that the RAP picture is of a type that can have associated leading pictures including a tagged for discard (TFD) leading based on the NAL unit type value, and wherein decoding comprises parsing, without decoding, data of the bitstream corresponding to TFD pictures when the CRA picture is used as a random access point.

3. The method of claim 1, wherein decapsulating the slice comprises retrieving a value for the NAL unit type value that indicates whether the RAP picture comprises the IDR picture or the CRA picture.

4. The method of claim 1, further comprising:', 'determining, for a subsequent NAL unit, that a NAL unit type value indicates that the subsequent NAL unit comprises a suffix supplemental enhancement information (SEI) NAL unit including a suffix SEI message; and', 'decoding video data of the bitstream following the suffix SEI NAL unit based on data of the suffix SEI message.

5. The method of claim 4, further comprising extracting the suffix SEI NAL unit from an access unit (AU) that includes at least a first video coding layer (VCL) NAL unit in the AU prior to the suffix SEI NAL unit in decoding order.

6. The method of claim 5, wherein the suffix SEI NAL unit follows all VCL NAL units in the AU in decoding order.

7. A device for decoding video data, the device comprising a processor configured to decapsulate a slice of a random access point (RAP) picture of a bitstream from a network abstraction layer (NAL) unit, wherein the NAL unit includes a NAL unit type value that indicates whether the RAP picture is of a type that can have associated leading pictures and whether the RAP picture is an instantaneous decoder refresh (IDR) picture or a clean random access (CRA) picture, determine whether the RAP picture can have associated leading pictures based on the NAL unit type value, and decode video data of the bitstream following the RAP picture based on the determination of whether the RAP picture can have associated leading pictures.

8. The device of claim 7, wherein the NAL unit type value indicates that the RAP picture comprises the CRA picture, wherein the processor is configured to determine, based on the NAL unit type value, that the RAP picture is of a type that can have associated leading pictures including a tagged for discard (TFD) leading based on the NAL unit type value, and wherein the processor is configured to parse, without decoding, data of the bitstream corresponding to TFD pictures when the CRA picture is used as a random access point.

9. The device of claim 7, wherein the processor is configured to retrieve a value for the NAL unit type value that indicates whether the RAP picture comprises the IDR picture or the CRA picture

10. The device of claim 7, wherein the processor is further configured to determine, for a subsequent NAL unit, that a NAL unit type value indicates that the subsequent NAL unit comprises a suffix supplemental enhancement information (SEI) NAL unit including a suffix SEI message, and decode video data of the bitstream following the suffix SEI NAL unit based on data of the suffix SEI message

11. The device of claim 10, wherein the processor is configured to extract the suffix SEI NAL unit from an access unit (AU) that includes at least a first video coding layer (VCL) NAL unit in the AU prior to the suffix SEI NAL unit in decoding order

12. The device of claim 11, wherein the suffix SEI NAL unit follows all VCL NAL units in the AU in decoding order

13. A device for decoding video data, the device comprising:', 'means for decapsulating a slice of a random access point (RAP) picture of a bitstream from a network abstraction layer (NAL) unit, wherein the NAL unit includes a NAL unit type value that indicates whether the RAP picture is of a type that can have associated leading pictures and whether the RAP picture is an instantaneous decoder refresh (IDR) picture or a clean random access (CRA) picture;', 'means for determining whether the RAP picture can have associated leading pictures based on the NAL unit type value; and', 'means for decoding video data of the bitstream following the RAP picture based on the determination of whether the RAP picture can have associated leading pictures

14. The device of claim 13, wherein the NAL unit type value indicates that the RAP picture comprises the CRA picture, wherein the means for determining comprises means for determining that the RAP picture is of a type that can have associated leading pictures including a tagged for discard (TFD) leading based on the NAL unit type value, and wherein the means for decoding comprises means for parsing, without decoding, data of the bitstream corresponding to TFD pictures when the CRA picture is used as a random access point

15. The device of claim 13, wherein the means for decapsulating the slice comprises means for retrieving a value for the NAL unit type value that indicates whether the RAP picture comprises the IDR picture or the CRA picture

16. The device of claim 13, further comprising:', 'means for determining, for a subsequent NAL unit, that a NAL unit type value indicates that the subsequent NAL unit comprises a suffix supplemental enhancement information (SEI) NAL unit including a suffix SEI message; and', 'means for decoding video data of the bitstream following the suffix SEI NAL unit based on data of the suffix SEI message

17. The device of claim 16, further comprising means for extracting the suffix SEI NAL unit from an access unit (AU) that includes at least a first video coding layer (VCL) NAL unit in the AU prior to the suffix SEI NAL unit in decoding order

18. The device of claim 17, wherein the suffix SEI NAL unit follows all VCL NAL units in the AU in decoding order

19. A computer-readable storage medium having stored thereon instructions that, when executed, cause a processor to:', 'decapsulate a slice of a random access point (RAP) picture of a bitstream from a network abstraction layer (NAL) unit, wherein the NAL unit includes a NAL unit type value that indicates whether the RAP picture is of a type that can have associated leading pictures and whether the RAP picture is an instantaneous decoder refresh (IDR) picture or a clean random access (CRA) picture;', 'determine whether the RAP picture can have associated leading pictures based on the NAL unit type value; and', 'decode video data of the bitstream following the RAP picture based on the determination of whether the RAP picture can have associated leading pictures.

20. The computer-readable storage medium of claim 19, wherein the NAL unit type value indicates that the RAP picture comprises the CRA picture, wherein the', 'instructions that cause the processor to determine comprise instructions that cause the processor to determine that the RAP picture is of a type that can have associated leading pictures including a tagged for discard (TFD) leading based on the NAL unit type value, and wherein the instructions that cause the processor to decode comprise instructions that cause the processor to parse, without decoding, data of the bitstream corresponding to TFD pictures when the CRA picture is used as a random access point.

21. The computer-readable storage medium of claim 19, wherein the instructions that cause the processor to decapsulate the slice comprise instructions that cause the processor to retrieve a value for the NAL unit type value that indicates whether the RAP picture comprises the IDR picture or the CRA picture.

22. The computer-readable storage medium of claim 19, further comprising instructions that cause the processor to:', 'determine, for a subsequent NAL unit, that a NAL unit type value indicates that the subsequent NAL unit comprises a suffix supplemental enhancement information (SEI) NAL unit including a suffix SEI message; and', 'decode video data of the bitstream following the suffix SEI NAL unit based on data of the suffix SEI message.

23. The computer-readable storage medium of claim 22, further comprising instructions that cause the processor to extract the suffix SEI NAL unit from an access unit (AU) that includes at least a first video coding layer (VCL) NAL unit in the AU prior to the suffix SEI NAL unit in decoding order.

24. The computer-readable storage medium of claim 23, wherein the suffix SEI NAL unit follows all VCL NAL units in the AU in decoding order.

25. A method of generating a bitstream including video data, the method comprising:', 'determining whether a random access point (RAP) picture is of a type that can have associated leading pictures and whether the RAP picture comprises an', 'instantaneous decoder refresh (IDR) picture or a clean random access (CRA) picture; encapsulating a slice of the RAP picture in a network abstraction layer (NAL) unit, wherein the NAL unit includes a NAL unit type value that indicates whether the RAP picture is of a type that can have associated leading pictures; and', 'generating a bitstream including the NAL unit.

26. The method of claim 25, wherein the RAP picture comprises the CRA picture, wherein determining comprises determining that the RAP picture is of a type that can have associated leading pictures including a tagged for discard (TFD) leading, and wherein encapsulating the slice comprises setting a value for the NAL unit type value to indicate that the CRA picture can have associated TFD leading pictures.

27. The method of claim 25, wherein encapsulating the slice comprises setting a value for the NAL unit type value to indicate whether the RAP picture comprises the IDR picture or the CRA picture.

28. The method of claim 25, further comprising:', 'determining whether a supplemental enhancement information (SEI) message is a prefix SEI message or a suffix SEI message, wherein the SEI message includes data related to the encoded slice of video data; and', 'encapsulating the SEI message in an SEI NAL unit, wherein the SEI NAL unit includes a NAL unit type value that indicates whether the SEI NAL unit is a prefix SEI NAL unit or a suffix SEI NAL unit and whether the SEI message is a prefix SEI message or a suffix SEI message,', 'wherein generating the bitstream further comprises generating the bitstream to include the SEI NAL unit.

29. The method of claim 28, wherein generating the bitstream comprises', 'encapsulating the SEI NAL unit in an access unit (AU) such that the SEI NAL unit follows a first video coding layer (VCL) NAL unit in the AU in decoding order when the NAL unit type value indicates that the SEI NAL unit is a suffix SEI NAL unit.

30. The method of claim 29, wherein generating the bitstream further comprises encapsulating the SEI NAL unit in the AU such that the SEI NAL unit further succeeds a last VCL NAL unit in the AU in decoding order when the NAL unit type value indicates that the SEI NAL unit is the suffix SEI NAL unit.

31. A device for generating a bitstream including video data, the device comprising a processor configured to determine whether a random access point (RAP) picture is of a type that can have associated leading pictures and whether the RAP picture comprises an instantaneous decoder refresh (IDR) picture or a clean random access (CRA) picture, encapsulate a slice of the RAP picture in a network abstraction layer (NAL) unit, wherein the NAL unit includes a NAL unit type value that indicates whether the RAP picture is of a type that can have associated leading pictures, and generate a bitstream including the NAL unit.

32. The device of claim 31 , wherein the RAP picture comprises the CRA picture, wherein the processor is configured to determine that the RAP picture is of a type that can have associated leading pictures including a tagged for discard (TFD) leading, and wherein the processor is configured to set a value for the NAL unit type value to indicate that the CRA picture can have associated TFD leading pictures.

33. The device of claim 31 , wherein the processor is configured to set a value for the NAL unit type value to indicate whether the RAP picture comprises the IDR picture or the CRA picture.

34. The device of claim 31 , wherein the processor is further configured to determine whether a supplemental enhancement information (SEl) message is a prefix SEl message or a suffix SEl message, wherein the SEl message includes data related to the encoded slice of video data, encapsulate the SEl message in an SEl NAL unit, wherein the SEl NAL unit includes a NAL unit type value that indicates whether the SEl NAL unit is a prefix SEl NAL unit or a suffix SEl NAL unit and whether the SEl message is a prefix SEl message or a suffix SEl message, and generate the bitstream to include the SEl NAL unit.

35. The device of claim 34, wherein the processor is configured to encapsulate the SEl NAL unit in an access unit (AU) such that the SEl NAL unit follows a first video coding layer (VCL) NAL unit in the AU in decoding order when the NAL unit type value indicates that the SEl NAL unit is a suffix SEl NAL unit.

36. The device of claim 35, wherein the processor is configured to encapsulate the SEl NAL unit in the AU such that the SEl NAL unit further succeeds a last VCL NAL unit in the AU in decoding order when the NAL unit type value indicates that the SEl NAL unit is the suffix SEl NAL unit.

37. A device for generating a bitstream including video data, the device comprising: means for determining whether a random access point (RAP) picture is of a type that can have associated leading pictures and whether the RAP picture comprises an instantaneous decoder refresh (IDR) picture or a clean random access (CRA) picture; means for encapsulating a slice of the RAP picture in a network abstraction layer (NAL) unit, wherein the NAL unit includes a NAL unit type value that indicates whether the RAP picture is of a type that can have associated leading pictures; and', 'means for generating a bitstream including the NAL unit.

38. The device of claim 37, wherein the RAP picture comprises the CRA picture, wherein the means for determining comprises means for determining that the RAP picture is of a type that can have associated leading pictures including a tagged for discard (TFD) leading, and wherein the means for encapsulating the slice comprises means for setting a value for the NAL unit type value to indicate that the CRA picture can have associated TFD leading pictures.

39. The device of claim 37, wherein the means for encapsulating the slice comprises means for setting a value for the NAL unit type value to indicate whether the RAP picture comprises the IDR picture or the CRA picture.

40. The device of claim 37, further comprising:', 'means for determining whether a supplemental enhancement information (SEI) message is a prefix SEI message or a suffix SEI message, wherein the SEI message includes data related to the encoded slice of video data; and', 'means for encapsulating the SEI message in an SEI NAL unit, wherein the SEI NAL unit includes a NAL unit type value that indicates whether the SEI NAL unit is a prefix SEI NAL unit or a suffix SEI NAL unit and whether the SEI message is a prefix SEI message or a suffix SEI message,', 'wherein the means for generating the bitstream further comprises means for generating the bitstream to include the SEI NAL unit.

41. The device of claim 40, wherein the means for generating the bitstream comprises means for encapsulating the SEI NAL unit in an access unit (AU) such that the SEI NAL unit follows a first video coding layer (VCL) NAL unit in the AU in decoding order when the NAL unit type value indicates that the SEI NAL unit is a suffix SEI NAL unit.

42. The device of claim 41, wherein the means for generating the bitstream further comprises means for encapsulating the SEI NAL unit in the AU such that the SEI NAL unit further succeeds a last VCL NAL unit in the AU in decoding order when the NAL unit type value indicates that the SEI NAL unit is the suffix SEI NAL unit.

43. A computer-readable storage medium having stored thereon instructions that, when executed, cause a processor to:', 'determine whether a random access point (RAP) picture is of a type that can have associated leading pictures and whether the RAP picture comprises an', 'instantaneous decoder refresh (IDR) picture or a clean random access (CRA) picture; encapsulate a slice of the RAP picture in a network abstraction layer (NAL) unit, wherein the NAL unit includes a NAL unit type value that indicates whether the RAP picture is of a type that can have associated leading pictures; and', 'generate a bitstream including the NAL unit.

44. The computer-readable storage medium of claim 43, wherein the RAP picture comprises the CRA picture, wherein the instructions that cause the processor to determine comprise instructions that cause the processor to determine that the RAP picture is of a type that can have associated leading pictures including a tagged for discard (TFD) leading, and wherein the instructions that cause the processor to encapsulate the slice comprise instructions that cause the processor to set a value for the NAL unit type value to indicate that the CRA picture can have associated TFD leading pictures.

45. The computer-readable storage medium of claim 43, wherein the instructions that cause the processor to encapsulate the slice comprise instructions that cause the processor to set a value for the NAL unit type value to indicate whether the RAP picture comprises the IDR picture or the CRA picture.

46. The computer-readable storage medium of claim 43, further comprising instructions that cause the processor to:', 'determine whether a supplemental enhancement information (SEI) message is a prefix SEI message or a suffix SEI message, wherein the SEI message includes data related to the encoded slice of video data; and', 'encapsulate the SEI message in an SEI NAL unit, wherein the SEI NAL unit includes a NAL unit type value that indicates whether the SEI NAL unit is a prefix SEI NAL unit or a suffix SEI NAL unit and whether the SEI message is a prefix SEI message or a suffix SEI message,', 'wherein the instructions that cause the processor to generate the bitstream further comprise instructions that cause the processor to generate the bitstream to include the SEI NAL unit.

47. The computer-readable storage medium of claim 46, wherein the instructions that cause the processor to generate the bitstream comprise instructions that cause the processor to encapsulate the SEI NAL unit in an access unit (AU) such that the SEI NAL unit follows a first video coding layer (VCL) NAL unit in the AU in decoding order when the NAL unit type value indicates that the SEI NAL unit is a suffix SEI NAL unit.

48. The computer-readable storage medium of claim 47, wherein the instructions that cause the processor to generate the bitstream further comprise instructions that cause the processor to encapsulate the SEI NAL unit in the AU such that the SEI NAL unit further succeeds a last VCL NAL unit in the AU in decoding order when the NAL unit type value indicates that the SEI NAL unit is the suffix SEI NAL unit.']