// Copyright (c) 2003-2009 Nokia Corporation and/or its subsidiary(-ies).

 // All rights reserved.

 // This component and the accompanying materials are made available

 // under the terms of the License "Symbian Foundation License v1.0" to Symbian Foundation members and "Symbian Foundation End User License Agreement v1.0" to non-members

 // which accompanies this distribution, and is available

 // at the URL "http://www.symbianfoundation.org/legal/licencesv10.html".

 //

 // Initial Contributors:

 // Nokia Corporation - initial contribution.

 //

 // Contributors:

 //

 // Description:

 // Constants and structs specific to AVC.  See the DevVideo specs for more details.

 // 

 //

 #ifndef __DEVVIDEO_AVC_H__

 #define __DEVVIDEO_AVC_H__

 #include <e32base.h>

 /**

 Specifies the picture type.

 @publishedAll

 @released

 */

 enum TAvcPictureType

     {

 	/**

 	INTRA picture, a picture consisted of at least one I slice and zero or more SI slices

 	*/

 	EAvcPictureTypeI   = 0x01,

 	/**

 	INTER picture, a picture consisted of at least one P slice and zero or more I, SI and SP slices

 	*/

 	EAvcPictureTypeP   = 0x02,

 	/**

 	Bi-predictive picture, a picture consisted of at least one B slice and zero or more I, P, SI, 

 	and SP slices 

 	*/

 	EAvcPictureTypeB   = 0x04,

 	/**

 	SI picture or switching I picture, a picture consisted of SI slices

 	*/

 	EAvcPictureTypeSI  = 0x08,

 	/**

 	SP picture or switching P picture, a picture consisted of at least one SP slice and zero or more

 	SI slices

 	*/

 	EAvcPictureTypeSP  = 0x10

     };

 /**

 These enumerations can be used in codec capability indication and/or bitstream property indication.

 When used as part of an encoder capability indication, a signaled value indicates the capability 

 of an encoder to produce such Supplemental Enhancement Information (SEI) to the bitstream and the 

 additional meanings as specified below. When used as part of a decoder capability indication, a 

 signalled value indicates the capability of a decoder to react to such information in a way as

 specified below. If a decoder does not have such capability, it shall be able to parse and discard

 the information. When used as part of a bitstream property indication, a non-signalled value 

 indicates the absence of such information in the bitstream and a signalled value indicates the 

 possibility of having such information in the bitstream.

 @publishedAll

 @released

 */

 enum TAvcSupplementalInformation

     {

 	/**

 	encoder capability:	no meaning

 	decoder capability:	capability to initialize Hypothetical Reference Decoder (HRD) as specified 

 						in AVC Annex C at any buffering period SEI message

 	bitstream property:	existence of Network Abstraction Layer (NAL) units with nal_unit_type equal

 						to 6 and the SEI payload type (payloadType) equal to 0 

 	*/

 	EAvcSeiBufferingPeriod			 				= 0x00000001,

 	/**

 	encoder capability:	no meaning

 	decoder capability:	capability to operate HRD and decode/display video streams according to the

 						provided timing information

 	bitstream property:	existence of NAL units with nal_unit_type equal to 6 and payloadType equal 

 						to 1

 	*/

 	EAvcSeiPictureTiming         					= 0x00000002,

 	/**

 	encoder capability:	no meaning

 	decoder capability:	capability to crop after decoding and to display the specified rectangular 

 						region 

 	bitstream property:	existence of NAL units with nal_unit_type equal to 6 and payloadType equal 

 						to 2

 	*/

 	EAvcSeiPanScanRectangle         				= 0x00000004,

 	/**

 	encoder capability:	no meaning

 	decoder capability:	no meaning

 	bitstream property:	existence of NAL units with nal_unit_type equal to 6 and payloadType equal

 						to 3

 	*/

 	EAvcSeiFillerPayload 							= 0x00000008,

 	/**

 	encoder capability:	no meaning

 	decoder capability:	no meaning

 	bitstream property:	existence of NAL units with nal_unit_type equal to 6 and payloadType equal 

 						to 4

 	*/

 	EAvcSeiUserDataRegisteredByITUTRecT35  			= 0x00000010,

 	/**

 	encoder capability:	no meaning

 	decoder capability:	no meaning

 	bitstream property:	existence of NAL units with nal_unit_type equal to 6 and payloadType equal

 						to 5

 	*/

 	EAvcSeiUserDataUnRegistered       				= 0x00000020,

 	/**

 	encoder capability:	no meaning

 	decoder capability:	capability to start decoding from any access unit with a recovery point SEI 

 						message

 	bitstream property:	existence of NAL units with nal_unit_type equal to 6 and payloadType equal

 						to 6

 	*/

 	EAvcSeiRecoveryPoint    						= 0x00000040,

 	/**

 	encoder capability:	capability to repeat the decoded reference picture marking syntax structure

 						as specified in subclauses 7.3.3.3 and 7.4.3.3 of the AVC specification.

 	decoder capability:	capability to recover the decoded reference picture marking process due to

 						losses of reference pictures with decoded reference picture marking syntax

 	bitstream property:	existence of NAL units with nal_unit_type equal to 6 and payloadType equal 

 						to 7

 	*/

 	EAvcSeiDecodedReferencePictureMarkingRepetition	= 0x00000080,

 	/**

 	encoder capability:	capability to analyze video pictures for creation of spare picture information

 	decoder capability:	capability to utilize the spare picture information to enhance video decoding

 						in case there is loss of reference pictures

 	bitstream property:	existence of NAL units with nal_unit_type equal to 6 and payloadType equal

 						to 8

 	*/

 	EAvcSeiSparePicture		       					= 0x00000100,

 	/**

 	encoder capability:	no meaning

 	decoder capability:	capability to utilize the scene information to enhance error concealment

 	bitstream property:	existence of NAL units with nal_unit_type equal to 6 and payloadType equal

 						to 9

 	*/

 	EAvcSeiSceneInformation						   	= 0x00000200,

 	/**

 	encoder capability:	no meaning

 	decoder capability:	capability to utilize the sub-sequence information to achieve temporal

 						scalability

 	bitstream property:	existence of NAL units with nal_unit_type equal to 6 and payloadType

 						equal to 10

 	*/

 	EAvcSeiSubsequenceInformation		     		= 0x00000400,

 	/**

 	encoder capability:	no meaning

 	decoder capability:	capability to utilize the sub-sequence information and the sub-sequence

 						layer characteristics to achieve temporal scalability

 	bitstream property:	existence of NAL units with nal_unit_type equal to 6 and payloadType 

 						equal to 11 (if sub-sequence layer characteristics SEI message is present,

 						sub-sequence information SEI message must be present)

 	*/

 	EAvcSeiSubsequenceLayerCharacteristics       	= 0x00000800,

 	/**

 	encoder capability:	no meaning

 	decoder capability:	capability to utilize the sub-sequence information and the sub-sequence 

 						characteristics to achieve temporal scalability

 	bitstream property:	existence of NAL units with nal_unit_type equal to 6 and payloadType equal

 						to 12 (if sub-sequence characteristics SEI message is present, sub-sequence

 						information SEI message must be present)

 	*/

 	EAvcSeiSubsequenceCharacteristics       		= 0x00001000,

 	/**

 	encoder capability:	no meaning

 	decoder capability:	capability to freeze displayed picture according to AVC Annex D.2.14.

 	bitstream property:	existence of NAL units with nal_unit_type equal to 6 and payloadType equal

 						to 13

 	*/

 	EAvcSeiFullFrameFreeze	               			= 0x00002000,

 	/**

 	encoder capability:	no meaning

 	decoder capability:	capability to release frozen displayed picture according to AVC Annex D.2.15

 	bitstream property:	existence of NAL units with nal_unit_type equal to 6 and payloadType 

 						equal to 14

 	*/

 	EAvcSeiFullFrameFreezeRelease					= 0x00004000,

 	/**

 	encoder capability:	no meaning

 	decoder capability:	no meaning

 	bitstream property:	existence of NAL units with nal_unit_type equal to 6 and payloadType

 						equal to 15

 	*/

 	EAvcSeiFullFrameSnapshot				    	= 0x00008000,

 	/**

 	encoder capability:	no meaning

 	decoder capability:	no meaning

 	bitstream property:	existence of NAL units with nal_unit_type equal to 6 and payloadType

 						equal to 16

 	*/

 	EAvcSeiProgressiveRefinementSegmentStrat     	= 0x00010000,

 	/**

 	encoder capability:	no meaning

 	decoder capability:	no meaning

 	bitstream property:	existence of NAL units with nal_unit_type equal to 6 and payloadType 

 						equal to 17

 	*/

 	EAvcSeiProgressiveRefinementSegmentEnd   		= 0x00020000,

 	/**

 	encoder capability:	capability to constrain the inter prediction process according to 

 						AVC Annex D.2.19

 	decoder capability:	capability to decode only part of the pictures covered by the motion-

 						constrained slice group set

 	bitstream property:	existence of NAL units with nal_unit_type equal to 6 and payloadType equal

 						to 18

 	*/

 	EAvcSeiMotionConstrainedSliceGroupSet        	= 0x00040000

     };

 /**

 AVC Picture Header.

 @publishedAll

 @released

 */

 class TAvcPictureHeader

     {

 public:

 	/**

 	Equal to ETrue indicates that the bitstream obeys all constraints specified in subclause A.2.1

 	of the AVC specification, equal to EFalse indicates that the bitstream may or may not obey the 

 	constraints. The value is equal to ETrue (EFalse) if the syntax element constraint_set0_flag is

 	equal to 1 (0). 

 	*/

 	TBool iBaselineProfileConstraintSet;

 	/**

 	Equal to ETrue indicates that the bitstream obeys all constraints specified in subclause A.2.2

 	of the AVC specification, equal to EFalse indicates that the bitstream may or may not obey the 

 	constraints. The value is equal to ETrue (EFalse) if the syntax element constraint_set1_flag is

 	equal to 1 (0). 

 	*/

 	TBool iMainProfileConstraintSet;

 	/**

 	Equal to ETrue indicates that the bitstream obeys all constraints specified in subclause A.2.3 

 	of the AVC specification, equal to EFalse indicates that the bitstream may or may not obey the

 	constraints. The value is equal to ETrue (EFalse) if the syntax element constraint_set2_flag is

 	equal to 1 (0). 

 	*/

 	TBool iExtendedProfileConstraintSet;

 	/**

 	Indicates the picture type. iPictureType is set as one of the values defined in TAvcPictureType.

 	*/

 	TAvcPictureType iPictureType;

 	/**

 	iLongTermPicture equal to ETrue indicates that the picture is a long-term picture, i.e., it has 

 	been marked as "used for long-term reference" according to the decoded reference picture marking 

 	process as specified in subclause 8.2.5 of the AVC specification. Otherwise the picture is not a 

 	long-term picture.

 	*/

 	TBool iLongTermPicture;

 	/**

 	Indicates whether the picture is a frame or a field. iFrame is equal to ETrue if the picture is 

 	a frame (field_pic_flag is equal to 0), EFalse if the picture is a field (field_pic_flag is equal

 	to 1).

 	*/

 	TBool iFrame;

 	/**

 	Valid only if iFrame is equal to EFalse. Indicates whether the field picture is a top field or a

 	bottom field. iTopField is equal to ETrue if the picture is a top field (bottom_field_flag is 

 	equal to 0), EFalse if the picture is a bottom field (bottom_field_flag is equal to 0).

 	*/

 	TBool iTopField;

 	/**

 	Indicates the picture order count of the top field of a frame, the top field of a complementary 

 	field pair, or a top field. iTopFieldOrderCount is equal to the value of TopFieldOrderCnt as 

 	specified in subclause 8.2.1 of the AVC specification.

 	*/

 	TUint iTopFieldOrderCount;

 	/**

 	Indicates the picture order count of the bottom field of a frame, the bottom field of a 

 	complementary field pair, or a bottom field. iBottomFieldOrderCount is equal to the value of 

 	BottomFieldOrderCnt as specified in subclause 8.2.1 of the AVC specification.

 	*/

 	TUint iBottomFieldOrderCount;

 	/**

 	Equal to ETrue indicates that the picture is an Instantaneous Decoding Refresh (IDR) picture;

 	otherwise the picture is not an IDR picture. The value of nal_unit_type of all the Video Coding

 	Layer (VCL) NAL units of the primary coded picture of an IDR picture shall be equal to 5.

 	*/

 	TBool iIdrPicture;

 	/**

 	Indicates the initial value of the quantization parameter. If iPictureType is equal to 

 	EAvcPictureTypeSI or EavcPictureTypeSP, iPQY is equal to pic_init_qs_minus26 + 26; otherwise

 	iPQY is equal to pic_init_qp_minus26 + 26.

 	*/

 	TUint iQPY;

 	/**

 	Pixel aspect ratio numerator. The pixel aspect ratio is defined as 

 	iAspectRatioNum/iAspectRatioDenom, where the values are positive integers and relatively prime. 

 	When aspect_ratio_idc is equal to 0 or sar_width is equal to 0 or sar_height is equal to 0, the 

 	sample aspect ratio shall be considered unspecified, and iAspectRatioNum and iAspectRationDenom 

 	are set to 0. When aspect_ratio_idc is equal to any of the value from 1 to 13, inclusive, 

 	iAspectRatioNum and iAspectRatioDenom are set according to Table E-1 of the AVC specification.

 	When aspect_ratio_idc is equal to 255 (Extended_SAR), iAspectRatioNum is set to sar_width and 

 	iAspectRatioDenom is set to sar_height.

 	*/

 	TUint iAspectRatioNum;

 	/**

 	Pixel aspect ratio denominator. The pixel aspect ratio is defined as 

 	iAspectRatioNum/iAspectRatioDenom, where the values are positive integers and relatively prime. 

 	When aspect_ratio_idc is equal to 0 or sar_width is equal to 0 or sar_height is equal to 0, the 

 	sample aspect ratio shall be considered unspecified, and iAspectRatioNum and iAspectRationDenom

 	are set to 0. When aspect_ratio_idc is equal to any of the value from 1 to 13, inclusive, 

 	iAspectRatioNum and iAspectRatioDenom are set according to Table E-1 of the AVC specification.

 	When aspect_ratio_idc is equal to 255 (Extended_SAR), iAspectRatioNum is set to sar_width and 

 	iAspectRatioDenom is set to sar_height.

 	*/

 	TUint iAspectRatioDenom;

 	/**

 	Indicates the frame cropping rectangle as specified in subclause 7.4.2.1 of the AVC specification.

 	*/

 	TRect iFrameCropRect;

 	/**

 	Equal to 0 indicates that the cropped (according to the frame cropping rectangle) decoded 

 	pictures output contain visually important information in the entire region out to the edges of 

 	the cropping rectangle of the picture, such that the cropped decoded pictures output should not 

 	be displayed using overscan. Instead, they should be displayed using either an exact match 

 	between the display area and the cropping rectangle, or using underscan. Equal to 1 indicates

 	that the cropped decoded picture output is suitable for display using overscan. Otherwise, it is 

 	unspecified whether the cropped decoded picture output is suitable for display using overscan or

 	not. 

 	*/

 	TUint iOverscanInfo;

 	/**

 	Indicates the representation of the pictures as specified in Table E-2 of the AVC specification, 

 	before being coded. 

 	*/

 	TUint iVideoFormat;

 	/**

 	Indicates whether a picture should be displayed as a frame or one or more fields, according to

 	Table D-1. iPictureStructure is equal to the syntax element pic_struct.

 	*/

 	TUint iPictureStructure;

 	/**

 	Each picture has up to NumClockTS sets of clock timestamp information. The value of NumClockTS

 	is as specified in Table D-1 of the AVC specification, with a maximum value equal to 3. Each 

 	instance of iClockTimestamp[i] indicates a time of origin, capture, or alternative ideal display,

 	in units of microseconds. iClockTimestamp[i] is equal to 

 	(clockTimestamp[i] / time_scale * 1000000), where clockTimestamp[i] is the i-th set of clock

 	timestamp information as specified in subclause D.2.2 of the AVC specification. 

 	iClockTimestamp[i] where i is larger than NumClockTS-1 is invalid. When picture timing 

 	information is not available, NumClockTS is set to zero.

 	*/

 	TTimeIntervalMicroSeconds iClockTimestamp[3];

     };

 /**

 This class is used to signal decoder or encoder capabilities or bitstream properties.

 @publishedAll

 @released

 */

 class TAvcVideoCapability

     {

 public:

 	/**

 	When used as part of a codec capability indication, iProfileLevel[ProfileIdc] indicates the 

 	maximum processing level that a decoder or an encoder supports for a particular profile set 

 	indicated by ProfileIdc (the indication is described below). A negative value indicates that

 	the profile set is not supported. When used as part of a stream property indication,

 	iProfileLevel[ProfileIdc] indicates the maximum processing level that is present in the stream

 	for a particular profile set indicated by ProfileIdc. A negative value indicates that the stream 

 	does not contain data coded according to the indicated profile set.

 	ProfileIdc equal to 0 indicates that all of constraint_set0_flag, constraint_set1_flag and 

 	constraint_set2_flag are equal to 1, and profile_idc may indicate any of the profiles (baseline,

 	main or extended). ProfileIdc equal to 1 indicates that constraint_set0_flag and 

 	constraint_set2_flag are equal to 1 while constraint_set1_flag is equal to 0, and 

 	profile_idc may indicate either the baseline or extended profile. ProfileIdc equal to 2 

 	indicates that constraint_set1_flag and constraint_set2_flag are equal to 1 while 

 	constraint_set0_flag is equal to 0, and profile_idc may indicate either the main or extended 

 	profile. ProfileIdc equal to 3 indicates that constraint_set1_flag is equal to 1 while the other

 	two flags are equal to 0, and profile_idc indicates the main profile. ProfileIdc equal to 4 

 	indicates that constraint_set2_flag is equal to 1 while the other two flags are equal to 0, and

 	profile_idc indicates the extended profile.

 	*/

 	TInt iProfileLevel[5];

 	/**

 	iSupplementalInformationCap indicates the supported supplemental enhancement functions. The 

 	value is a binary OR of values from TAvcSupplementalInformation.

 	*/

 	TUint32 iSupplementalInformationCap;

     };

 /**

 This class is used to set the encoder operation mode.

 @publishedAll

 @released

 */

 class TAvcVideoMode

     {

 public:

 	/**

 	Specifies the picture types allowed in the bitstream. The value is a binary OR of values from 

 	TAvcPictureType. Signaled picture types that are not included in the prevailing coding profile 

 	are ignored.

 	*/

 	TUint32 iAllowedPictureTypes;

 	/**

 	Specifies whether Flexible Macroblock Order (FMO) is allowed. Equal to ETrue indicates that 

 	num_slice_groups_minus1 is in the range of 0 to 7, inclusive, i.e. FMO is allowed. Equal to

 	EFalse indicates that num_slice_groups_minus1 shall be equal to 0 only, i.e., FMO is not allowed.

 	*/

 	TBool iFlexibleMacroblockOrder;

 	/**

 	Specifies whether redundant pictures may be encoded. Equal to ETrue indicates that 

 	redundant_pic_cnt_present_flag can be equal to either 0 or 1 (i.e., redundant pictures may be 

 	encoded), while Equal to EFalse indicates that redundant_pic_cnt_present_flag shall be equal to

 	0 only (i.e., redundant pictures cannot be encoded). 

 	*/

 	TBool iRedundantPictures;

 	/**

 	Specifies whether data partitioning is in use. When equal to ETrue, data partitioning is in use,

 	i.e., NAL unit streams can contain nal_unit_type values in the range of 2 to 4, inclusive. When 

 	equal to EFalse, data partitioning is not in use, i.e., NAL unit streams shall not contain 

 	nal_unit_type values in the range of 2 to 4, inclusive. If data partitioning is in use, the 

 	SetErrorProtectionLevelsL method, if used, should set the number of unequal error protection 

 	levels to be larger than one. 

 	*/

 	TBool iDataPartitioning;

 	/**

 	iFrameMBsOnly equal to ETrue specifies that every coded picture of the coded video sequence is a

 	coded frame containing only frame macroblocks. Equal to EFalse specifies that coded pictures of 

 	the coded video sequence may either be coded fields or coded frames.

 	*/

 	TBool iFrameMBsOnly;

 	/**

 	iMBAFFCoding equal to EFalse specifies no switching between frame and field 

 	macroblocks within a picture. Equal to ETrue specifies the possible use of switching between 

 	frame and field macroblocks within frames. Valid only when iFrameMBsOnly is equal to EFalse.

 	*/

 	TBool iMBAFFCoding;

 	/**

 	Specifies the entropy decoding method to be applied for the syntax elements for which two 

 	descriptors appear in the syntax tables. Equal to EFalse indicates that Exp-Golomb codes or 

 	CAVLC (Context-based Adaptive Variable Length Coding), as described in subclause 9.1 or 9.2 of

 	the AVC specification, is applied. Otherwise, CABAC (Context-based Adaptive Binary Arithmetic 

 	Coding) as described in subclause 9.3 of the AVC specification is applied.

 	*/

 	TBool iEntropyCodingCABAC;

 	/**

 	Equal to EFalse specifies that weighted prediction shall not be applied to P and SP slices.

 	Equal to ETrue specifies that weighted prediction may be applied to P and SP slices. 

 	*/

 	TBool iWeightedPPrediction;

 	/**

 	Equal to 0 specifies that the default weighted prediction is applied to B slices. Equal to 1 

 	specifies that explicit weighted prediction is applied to B slices. Equal to 2 specifies that 

 	implicit weighted prediction is applied to B slices.

 	*/

 	TUint iWeightedBipredicitonMode;

 	/**

 	Specifies the method used in the derivation process for luma motion vectors for B_Skip, 

 	B_Direct_16x16 and B_Direct_8x8 as specified in subclause 8.4.1.2 of the AVC specification. When

 	iFrameMBsOnly is equal to EFalse, iDirect8x8Inference shall be equal to ETrue. 

 	*/

 	TBool iDirect8x8Inference;

     };

 /**

 TAvcHrdParams specifies a set of AVC-specific HRD parameters. All pointers included in the objects

 have the same lifetime as the objects themselves, and the memory is allocated and deallocated by

 the same instance that creates and owns the object.

 @publishedAll

 @released

 */

 class TAvcHrdParams

     {

 public:

     class TCpbParams

         {

     public:

 		/**

 		Specifies the delay for a CPB between the time of arrival in the CPB of the first bit of the 

 		coded data associated with the access unit associated with the buffering period SEI message 

 		and the time of removal from the CPB of the coded data associated with the same access unit,

 		for the first buffering period after HRD initialisation. It is in units of a 90 kHz clock.

 		The value is equal to the corresponding initinal_cpb_removal_delay of the NAL HRD parameters

 		if the current parameter is for the NAL HRD or of the VCL HRD parameters if the current

 		parameter is for the VCL HRD. 

 		*/

 		TUint iInitialCpbRemovalDelay;

 		/**

 		This parameter is used for a CPB in combination with the cpb_removal_delay to specify the 

 		initial delivery time of coded access units to the CPB.  It is in units of a 90 kHz clock.

 		The value is equal to the corresponding initinal_cpb_removal_delay_offset of the NAL HRD 

 		parameters if the current parameter is for the NAL HRD or of the VCL HRD parameters if the

 		current parameter is for the VCL HRD.

 		Note: Over the entire coded video sequence, the sum of iInitialCpbRemovalDelay and the 

 		corresponding iInitialCpbRemovalDelayOffset shall be constant for either the NAL HRD

 		parameters or the VCL HRD parameters.

 		*/

 		TUint iInitialCpbRemovalDelayOffset;

 		/**

 		Equal to EFalse specifies that to decode this bitstream by the HRD using the CPB 

 		specification, the hypothetical stream scheduler (HSS) operates in an intermittent bit 

 		rate mode.  Equal to 1 specifies that the HSS operates in a constant bit rate (CBR) mode. 

 		*/

 		TBool iCbr;

 		/**

 		Specifies the maximum input bit rate, in bits per second, of a CPB. The value is equal to 

 		Bitrate as specified in subclause E.2.2 of the AVC specification.

 		*/

 		TUint iBitrate;

 		/**

 		Specifies the size, in bytes, of a CPB. The value is equal to CpbSize/8, where CpbSize is as

 		specified in subclause E.2.2 of the AVC specification.

 		*/

 		TUint iCpbSize;

         };

 	/**

 	Specifies the required size of the decoded picture buffer (DPB) in unit of bytes. The value is

 	equal to max_dec_frame_buffering* PicWidthInSamplesL*FrameHeightInMbs*2, where PicWidthInSamplesL

 	and FrameHeightInMbs are specified in subclause 7.4.2.1 of the AVC specification amd the syntax

 	element max_dec_frame_buffering as specified in subclause E.2.1 of the AVC specification.

 	*/

 	TUint iDpbSize;

 	/**

 	Specifies the HRD operational mode as specified in Annex C of the AVC specification. The value

 	of LowDelayHrd is equal to ETrue if the syntax element low_delay_hrd_flag is equal to 1, and

 	EFalse otherwise. This parameter is valid only if at least one of iNalCpbCount and iVclCpbCount

 	is larger than 0.

 	*/

 	TBool iLowDelayHrd;

 	/**

 	Specifies the number of alternative coded picture buffer (CPB) specifications for NAL HRD 

 	parameters in the bitstream. The value of iNalCpbCount is equal to cpb_cnt_minus1 + 1 in the 

 	NAL HRD parameters, if present. iNalCpbCount equal to 0 means that NAL HRD parameters are not

 	present.

 	*/

 	TUint iNalCpbCount;

 	/**

 	Valid only if iNalCpbCount is larger than zero. iNalCpbParams is a pointer to an object of 

 	TCpbParams, which contains the parameters of an alternative CPB.

 	*/

 	TCpbParams* iNalCpbParams;

 	/**

 	Specifies the number of alternative coded picture buffer (CPB) specifications for VCL HRD 

 	parameters in the bitstream. The value of iVclCpbCount is equal to cpb_cnt_minus1 + 1 in the

 	VCL HRD parameters, if present. iVclCpbCount equal to 0 means that VCL HRD parameters are not

 	present.

 	*/

 	TUint iVclCpbCount;

 	/**

 	Valid only if iVclCpbCount is larger than zero. iVclCpbParams is a pointer to an object of 

 	TCpbParams, which contains the parameters of an alternative CPB.

 	*/

 	TCpbParams* iVclCpbParams;

     };

 #endif