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implementations ",{"type":10,"tag":24,"props":25,"children":27},"normative",{"type":26},"may",[],{"type":16,"value":29}," expose one or more queue families supporting\nvideo coding operations.\nThese operations are performed by recording them into a command buffer\nwithin a ",{"type":10,"tag":31,"props":32,"children":34},"a",{"href":33},"/chapters/video-coding#video-coding-scope",[35],{"type":16,"value":36},"video coding scope",{"type":16,"value":38},", and submitting them to\nqueues with compatible video coding capabilities.",{"type":10,"tag":18,"props":40,"children":41},{},[42],{"type":16,"value":43},"The Vulkan video functionalities are designed to be made available through a\nset of APIs built on top of each other, consisting of:",{"type":10,"tag":45,"props":46,"children":47},"ul",{},[48,54,59],{"type":10,"tag":49,"props":50,"children":51},"li",{},[52],{"type":16,"value":53},"A core API providing common video coding functionalities,",{"type":10,"tag":49,"props":55,"children":56},{},[57],{"type":16,"value":58},"APIs providing codec-independent video decode and video encode related\nfunctionalities, respectively,",{"type":10,"tag":49,"props":60,"children":61},{},[62],{"type":16,"value":63},"Additional codec-specific APIs built on top of those.",{"type":10,"tag":18,"props":65,"children":66},{},[67],{"type":16,"value":68},"This chapter details the fundamental components and operations of these.",{"type":10,"tag":70,"props":71,"children":73},"h2",{"id":72},"video-picture-resources",[74],{"type":16,"value":75},"Video Picture Resources",{"type":10,"tag":18,"props":77,"children":78},{},[79,81,85,87,93,95,98],{"type":16,"value":80},"In the context of video coding, multidimensional arrays of image data that\n",{"type":10,"tag":24,"props":82,"children":84},{"type":83},"can",[],{"type":16,"value":86}," be used as the source or target of video coding operations are referred\nto as ",{"type":10,"tag":88,"props":89,"children":90},"em",{},[91],{"type":16,"value":92},"video picture resources",{"type":16,"value":94},".\nThey ",{"type":10,"tag":24,"props":96,"children":97},{"type":26},[],{"type":16,"value":99}," store additional metadata that includes implementation-private\ninformation used during the execution of video coding operations, as\ndiscussed later.",{"type":10,"tag":18,"props":101,"children":102},{},[103,105,111,113,119,121,124,126,132,134,140,141,147,149,155],{"type":16,"value":104},"Video picture resources are backed by ",{"type":10,"tag":31,"props":106,"children":108},{"href":107},"/man/VkImage",[109],{"type":16,"value":110},"VkImage",{"type":16,"value":112}," objects.\nIndividual subregions of ",{"type":10,"tag":31,"props":114,"children":116},{"href":115},"/man/VkImageView",[117],{"type":16,"value":118},"VkImageView",{"type":16,"value":120}," objects created from such\nresources ",{"type":10,"tag":24,"props":122,"children":123},{"type":83},[],{"type":16,"value":125}," be used as\n",{"type":10,"tag":31,"props":127,"children":129},{"href":128},"/chapters/video-coding#decode-output-picture",[130],{"type":16,"value":131},"decode output pictures",{"type":16,"value":133},",\n",{"type":10,"tag":31,"props":135,"children":137},{"href":136},"/chapters/video-coding#encode-input-picture",[138],{"type":16,"value":139},"encode input pictures",{"type":16,"value":133},{"type":10,"tag":31,"props":142,"children":144},{"href":143},"/chapters/video-coding#reconstructed-picture",[145],{"type":16,"value":146},"reconstructed pictures",{"type":16,"value":148},", and/or\n",{"type":10,"tag":31,"props":150,"children":152},{"href":151},"/chapters/video-coding#reference-picture",[153],{"type":16,"value":154},"reference pictures",{"type":16,"value":156},".",{"type":10,"tag":18,"props":158,"children":159},{},[160,162,169],{"type":16,"value":161},"The parameters of a video picture resource 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picture",{"type":16,"value":203}," is a ",{"type":10,"tag":31,"props":205,"children":207},{"href":206},"/chapters/video-coding#video-picture-resources",[208],{"type":16,"value":209},"video picture\nresource",{"type":16,"value":211}," resulting from this process.",{"type":10,"tag":188,"props":213,"children":215},{"id":214},"reference-picture",[],{"type":10,"tag":18,"props":217,"children":218},{},[219,221,224,226,230],{"type":16,"value":220},"Such reconstructed pictures ",{"type":10,"tag":24,"props":222,"children":223},{"type":83},[],{"type":16,"value":225}," be used as ",{"type":10,"tag":88,"props":227,"children":228},{},[229],{"type":16,"value":154},{"type":16,"value":231}," in\nsubsequent video coding operations to provide predictions of the values of\nsamples of subsequently decoded or encoded pictures.\nThe correct use of such reconstructed pictures as reference pictures is\ndriven by the video compression standard, the implementation, and the\napplication-specific use cases.",{"type":10,"tag":188,"props":233,"children":235},{"id":234},"active-reference-pictures",[],{"type":10,"tag":18,"props":237,"children":238},{},[239,241,246],{"type":16,"value":240},"The list of reference pictures used to provide such predictions within a\nsingle video coding operation is referred to as the list of ",{"type":10,"tag":88,"props":242,"children":243},{},[244],{"type":16,"value":245},"active\nreference pictures",{"type":16,"value":156},{"type":10,"tag":18,"props":248,"children":249},{},[250,252,257,259,263,265,270,272,276,278,284,286,292,294,297,299,304,306,309,311,316,318,323],{"type":16,"value":251},"The ",{"type":10,"tag":88,"props":253,"children":254},{},[255],{"type":16,"value":256},"decoded picture buffer (DPB)",{"type":16,"value":258}," is an indexed data structure that\nmaintains the set of reference pictures available to be used in video coding\noperations.\n",{"type":10,"tag":188,"props":260,"children":262},{"id":261},"dpb-slot",[],{"type":16,"value":264}," Individual indexed entries of the DPB are referred to as the\n",{"type":10,"tag":88,"props":266,"children":267},{},[268],{"type":16,"value":269},"decoded picture buffer (DPB) slots",{"type":16,"value":271},".\n",{"type":10,"tag":188,"props":273,"children":275},{"id":274},"dpb-capacity",[],{"type":16,"value":277}," The range of valid DPB slot indices is between zero and\n",{"type":10,"tag":163,"props":279,"children":281},{"className":280},[],[282],{"type":16,"value":283},"N-1",{"type":16,"value":285},", where ",{"type":10,"tag":163,"props":287,"children":289},{"className":288},[],[290],{"type":16,"value":291},"N",{"type":16,"value":293}," is the capacity of the DPB.\nEach DPB slot ",{"type":10,"tag":24,"props":295,"children":296},{"type":83},[],{"type":16,"value":298}," refer to a reference picture containing a ",{"type":10,"tag":88,"props":300,"children":301},{},[302],{"type":16,"value":303},"video frame",{"type":16,"value":305},"\nor ",{"type":10,"tag":24,"props":307,"children":308},{"type":83},[],{"type":16,"value":310}," refer to up to two reference pictures containing the top and/or\nbottom ",{"type":10,"tag":88,"props":312,"children":313},{},[314],{"type":16,"value":315},"fields",{"type":16,"value":317}," that, when both present, together represent a full ",{"type":10,"tag":88,"props":319,"children":320},{},[321],{"type":16,"value":322},"video\nframe",{"type":16,"value":324},"\n.",{"type":10,"tag":188,"props":326,"children":328},{"id":327},"dpb-state-and-backing-store",[],{"type":10,"tag":18,"props":330,"children":331},{},[332],{"type":16,"value":333},"In Vulkan, the state and the backing store of the DPB is separated as\nfollows:",{"type":10,"tag":45,"props":335,"children":336},{},[337,350],{"type":10,"tag":49,"props":338,"children":339},{},[340,342,348],{"type":16,"value":341},"The state of individual DPB slots is maintained by 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including:",{"type":10,"tag":45,"props":378,"children":379},{},[380],{"type":10,"tag":49,"props":381,"children":382},{},[383,387,389,394],{"type":10,"tag":188,"props":384,"children":386},{"id":385},"reference-metadata",[],{"type":16,"value":388}," ",{"type":10,"tag":88,"props":390,"children":391},{},[392],{"type":16,"value":393},"Reference picture metadata",{"type":16,"value":395}," corresponding to the\nvideo picture resource associated with the DPB slot.",{"type":10,"tag":18,"props":397,"children":398},{},[399,401,404],{"type":16,"value":400},"Such metadata ",{"type":10,"tag":24,"props":402,"children":403},{"type":26},[],{"type":16,"value":405}," be stored by the implementation as part of the DPB slot\nstate maintained by the video session, or as part of the video picture\nresource backing the DPB slot.",{"type":10,"tag":18,"props":407,"children":408},{},[409,411,414],{"type":16,"value":410},"Any metadata stored in the video picture resources backing DPB slots are\nindependent of the video session used to store it, hence such video picture\nresources ",{"type":10,"tag":24,"props":412,"children":413},{"type":83},[],{"type":16,"value":415}," be shared with other video sessions.\nCorrespondingly, any metadata that is dependent on the video session will\nalways be stored as part of the DPB slot state maintained by that video\nsession.",{"type":10,"tag":18,"props":417,"children":418},{},[419],{"type":16,"value":420},"The responsibility of managing the DPB is split between the application and\nthe implementation as follows:",{"type":10,"tag":45,"props":422,"children":423},{},[424,442],{"type":10,"tag":49,"props":425,"children":426},{},[427,429,435,437,441],{"type":16,"value":428},"The application maintains the association between ",{"type":10,"tag":31,"props":430,"children":432},{"href":431},"/chapters/video-coding#dpb-slot",[433],{"type":16,"value":434},"DPB slot",{"type":16,"value":436},"\nindices and corresponding ",{"type":10,"tag":31,"props":438,"children":439},{"href":206},[440],{"type":16,"value":365},{"type":16,"value":156},{"type":10,"tag":49,"props":443,"children":444},{},[445,447,453],{"type":16,"value":446},"The implementation maintains global and per-slot opaque\n",{"type":10,"tag":31,"props":448,"children":450},{"href":449},"/chapters/video-coding#reference-metadata",[451],{"type":16,"value":452},"reference picture metadata",{"type":16,"value":156},{"type":10,"tag":18,"props":455,"children":456},{},[457],{"type":16,"value":458},"In addition, the application is also responsible for managing the mapping\nbetween the codec-specific picture IDs and DPB slots, and any other\ncodec-specific states unless otherwise specified.",{"type":10,"tag":460,"props":461,"children":463},"h3",{"id":462},"dpb-slot-states",[464],{"type":16,"value":465},"DPB Slot States",{"type":10,"tag":18,"props":467,"children":468},{},[469,471,476,478,483,485,490,492,496],{"type":16,"value":470},"At a given time, each DPB slot is either in ",{"type":10,"tag":88,"props":472,"children":473},{},[474],{"type":16,"value":475},"active",{"type":16,"value":477}," or ",{"type":10,"tag":88,"props":479,"children":480},{},[481],{"type":16,"value":482},"inactive",{"type":16,"value":484}," state.\nInitially, all DPB slots managed by a ",{"type":10,"tag":31,"props":486,"children":487},{"href":344},[488],{"type":16,"value":489},"video session",{"type":16,"value":491}," are in\n",{"type":10,"tag":88,"props":493,"children":494},{},[495],{"type":16,"value":482},{"type":16,"value":497}," state.",{"type":10,"tag":18,"props":499,"children":500},{},[501,503,506,508,513,515,519,521,526,528,533],{"type":16,"value":502},"A DPB slot ",{"type":10,"tag":24,"props":504,"children":505},{"type":83},[],{"type":16,"value":507}," be ",{"type":10,"tag":88,"props":509,"children":510},{},[511],{"type":16,"value":512},"activated",{"type":16,"value":514}," by using it as the target of picture\nreconstruction in a video coding operation with the reconstructed picture\nrequested to be set up as a reference picture, according to the\ncodec-specific semantics, changing its state to ",{"type":10,"tag":88,"props":516,"children":517},{},[518],{"type":16,"value":475},{"type":16,"value":520}," and associating it\nwith a ",{"type":10,"tag":88,"props":522,"children":523},{},[524],{"type":16,"value":525},"picture reference",{"type":16,"value":527}," to the ",{"type":10,"tag":31,"props":529,"children":530},{"href":143},[531],{"type":16,"value":532},"reconstructed\npictures",{"type":16,"value":156},{"type":10,"tag":18,"props":535,"children":536},{},[537,539,542],{"type":16,"value":538},"Some video coding standards allow multiple picture references to be\nassociated with a single DPB slot.\nIn this case the state of the individual picture references ",{"type":10,"tag":24,"props":540,"children":541},{"type":83},[],{"type":16,"value":543}," be\nindependently updated.",{"type":10,"tag":545,"props":546,"children":547},"note",{},[548],{"type":10,"tag":18,"props":549,"children":550},{},[551],{"type":16,"value":552},"As an example, H.264 decoding allows associating a separate top field and\nbottom field picture with the same DPB slot.",{"type":10,"tag":18,"props":554,"children":555},{},[556,558,561,563,567],{"type":16,"value":557},"As part of reference picture setup, the implementation ",{"type":10,"tag":24,"props":559,"children":560},{"type":26},[],{"type":16,"value":562}," also generate\n",{"type":10,"tag":31,"props":564,"children":565},{"href":449},[566],{"type":16,"value":452},{"type":16,"value":568},".\nSuch reference picture metadata is specific to each picture reference\nassociated with the DPB slot.",{"type":10,"tag":18,"props":570,"children":571},{},[572,574,579,581,585,587,590,592,597],{"type":16,"value":573},"If such a video coding operation completes successfully, the activated DPB\nslot will have a ",{"type":10,"tag":88,"props":575,"children":576},{},[577],{"type":16,"value":578},"valid picture reference",{"type":16,"value":580}," and the ",{"type":10,"tag":31,"props":582,"children":583},{"href":143},[584],{"type":16,"value":201},{"type":16,"value":586}," is associated with the DPB slot.\nThis is true even if the DPB slot is used as the target of a picture\nreconstruction that only sets up a top field or bottom field reference\npicture and thus does not yet refer to a complete frame.\nHowever, if any data provided as input to such a video coding operation is\nnot compliant with the video compression standard used, that video coding\noperation ",{"type":10,"tag":24,"props":588,"children":589},{"type":26},[],{"type":16,"value":591}," complete unsuccessfully, in which case the activated DPB slot\nwill have an ",{"type":10,"tag":88,"props":593,"children":594},{},[595],{"type":16,"value":596},"invalid picture reference",{"type":16,"value":598},".\nThis is true even if the DPB slot 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