[{"data":1,"prerenderedAt":10915},["ShallowReactive",2],{"mtZ4ekzruP":3,"VyF3Mmj32r":9381,"N9m89Rcq0G":9562},{"title":4,"description":5,"body":6,"_type":9380,"_id":4},"VK_KHR_video_queue.proposal","This document outlines a proposal to enable performing video coding operations in Vulkan.",{"type":7,"children":8,"toc":9329},"root",[9,16,23,28,53,58,63,69,74,93,98,103,108,114,121,126,132,137,142,250,263,276,281,287,292,297,357,370,376,381,473,510,529,535,540,561,566,571,584,597,602,607,612,625,630,636,641,759,764,934,939,1034,1039,1044,1062,1067,1072,1165,1170,1241,1260,1265,1359,1364,1453,1458,1463,1550,1556,1561,1566,1571,1576,1683,1687,1766,1779,1784,1865,1870,1935,1970,1975,1988,1993,1998,2003,2015,2020,2104,2109,2115,2120,2132,2205,2210,2322,2334,2344,2349,2354,2443,2456,2469,2495,2500,2505,2576,2596,2601,2606,2677,2683,2688,2701,2759,2792,2797,2802,2822,2946,2951,2957,2962,2985,2990,2996,3001,3086,3091,3119,3146,3195,3201,3214,3219,3239,3245,3250,3335,3340,3471,3476,3504,3509,3514,3519,3619,3638,3701,3706,3805,3833,3928,3941,3946,3952,3958,4671,4677,5034,5040,5602,5608,5937,5943,6452,6458,6800,6806,7061,7067,7607,7613,8157,8163,8783,8789,8795,8800,8838,8843,8849,8854,8874,8880,8885,8891,8896,8902,8913,8925,8945,8951,8969,8981,8987,8999,9017,9038,9056,9062,9067,9072,9077,9083,9096,9125,9160,9179,9184,9209,9214,9228,9233,9238,9244,9249,9254,9323],{"type":10,"tag":11,"props":12,"children":13},"element","p",{},[14],{"type":15,"value":5},"text",{"type":10,"tag":17,"props":18,"children":20},"h2",{"id":19},"_problem_statement",[21],{"type":15,"value":22},"Problem Statement",{"type":10,"tag":11,"props":24,"children":25},{},[26],{"type":15,"value":27},"Integrating video coding operations into Vulkan applications enable a wide set of new usage scenarios including, but not limited to, the following examples:",{"type":10,"tag":29,"props":30,"children":31},"ul",{},[32,38,43,48],{"type":10,"tag":33,"props":34,"children":35},"li",{},[36],{"type":15,"value":37},"Applying post-processing on top of video frames decoded from a compressed video stream",{"type":10,"tag":33,"props":39,"children":40},{},[41],{"type":15,"value":42},"Sourcing dynamic texture data from compressed video streams",{"type":10,"tag":33,"props":44,"children":45},{},[46],{"type":15,"value":47},"Recording the output of rendering operations",{"type":10,"tag":33,"props":49,"children":50},{},[51],{"type":15,"value":52},"Efficiently transferring rendering results over network (video conferencing, game streaming, etc.)",{"type":10,"tag":11,"props":54,"children":55},{},[56],{"type":15,"value":57},"It is also not uncommon for Vulkan capable devices to feature dedicated hardware acceleration for video compression and decompression.",{"type":10,"tag":11,"props":59,"children":60},{},[61],{"type":15,"value":62},"The goal of this proposal is to enable these use cases, expose the underlying hardware capabilities, and provide tight integration with other functionalities of the Vulkan API.",{"type":10,"tag":17,"props":64,"children":66},{"id":65},"_solution_space",[67],{"type":15,"value":68},"Solution Space",{"type":10,"tag":11,"props":70,"children":71},{},[72],{"type":15,"value":73},"The following options have been considered:",{"type":10,"tag":75,"props":76,"children":77},"ol",{},[78,83,88],{"type":10,"tag":33,"props":79,"children":80},{},[81],{"type":15,"value":82},"Rely on external sharing capabilities to interact with existing video APIs",{"type":10,"tag":33,"props":84,"children":85},{},[86],{"type":15,"value":87},"Add new dedicated APIs to Vulkan separately for video decoding and video encoding",{"type":10,"tag":33,"props":89,"children":90},{},[91],{"type":15,"value":92},"Add a common set of APIs to Vulkan enabling video coding operations in general",{"type":10,"tag":11,"props":94,"children":95},{},[96],{"type":15,"value":97},"Option 1 has the advantage of being the least invasive in terms of API changes. The disadvantage is that there are a wide range of video APIs out there, most of them being platform or vendor specific which makes creating portable applications difficult. Cross-API interaction also often comes with undesired performance costs and it makes it difficult, if not impossible, to take advantage of all the existing features of Vulkan in such scenarios.",{"type":10,"tag":11,"props":99,"children":100},{},[101],{"type":15,"value":102},"Option 2 enables integrating video coding operations into the API and leveraging all the other capabilities of Vulkan including, but not limited to, explicit resource management and synchronization. Besides that, an integrated solution greatly reduces application complexity and allows for better portability.",{"type":10,"tag":11,"props":104,"children":105},{},[106],{"type":15,"value":107},"Option 3 improves option 2 by acknowledging that there are a lot of facilities that could be shared across different video coding operations like video decoding and encoding. Accordingly, this proposal follows option 3 to introduce a set of concepts, object types, and commands that form the foundation of the video coding capabilities of Vulkan upon which additional functionalities can be layered providing specific video coding operations like video decoding or encoding, and support for individual video compression standards.",{"type":10,"tag":17,"props":109,"children":111},{"id":110},"_proposal",[112],{"type":15,"value":113},"Proposal",{"type":10,"tag":115,"props":116,"children":118},"h3",{"id":117},"_video_std_headers",[119],{"type":15,"value":120},"Video Std Headers",{"type":10,"tag":11,"props":122,"children":123},{},[124],{"type":15,"value":125},"As each video compression standard requires a large set of codec-specific parameters that are orthogonal to the Vulkan API itself, the definitions of those are not part of the Vulkan headers. Instead, these definitions are provided separately for each codec-specific extension in corresponding video std headers.",{"type":10,"tag":115,"props":127,"children":129},{"id":128},"_video_profiles",[130],{"type":15,"value":131},"Video Profiles",{"type":10,"tag":11,"props":133,"children":134},{},[135],{"type":15,"value":136},"This extension introduces the concept of video profiles. A video profile in Vulkan loosely resembles similar concepts defined in video compression standards, however, it is a more generic concept that encompasses additional information like the specific video coding operation, the content type/format, and any other information related to the video coding scenario.",{"type":10,"tag":11,"props":138,"children":139},{},[140],{"type":15,"value":141},"A video profile in Vulkan is defined using the following structure:",{"type":10,"tag":143,"props":144,"children":149},"pre",{"className":145,"code":146,"language":147,"meta":148,"style":148},"language-c shiki shiki-themes github-light-default github-dark-default","typedef struct VkVideoProfileInfoKHR {\n    VkStructureType                     sType;\n    const void*                         pNext;\n    VkVideoCodecOperationFlagBitsKHR    videoCodecOperation;\n    VkVideoChromaSubsamplingFlagsKHR    chromaSubsampling;\n    VkVideoComponentBitDepthFlagsKHR    lumaBitDepth;\n    VkVideoComponentBitDepthFlagsKHR    chromaBitDepth;\n} VkVideoProfileInfoKHR;\n","c","",[150],{"type":10,"tag":151,"props":152,"children":153},"code",{"__ignoreMap":148},[154,177,186,205,214,223,232,241],{"type":10,"tag":155,"props":156,"children":159},"span",{"class":157,"line":158},"line",1,[160,166,171],{"type":10,"tag":155,"props":161,"children":163},{"style":162},"--shiki-default:#CF222E;--shiki-dark:#FF7B72",[164],{"type":15,"value":165},"typedef",{"type":10,"tag":155,"props":167,"children":168},{"style":162},[169],{"type":15,"value":170}," struct",{"type":10,"tag":155,"props":172,"children":174},{"style":173},"--shiki-default:#1F2328;--shiki-dark:#E6EDF3",[175],{"type":15,"value":176}," VkVideoProfileInfoKHR {\n",{"type":10,"tag":155,"props":178,"children":180},{"class":157,"line":179},2,[181],{"type":10,"tag":155,"props":182,"children":183},{"style":173},[184],{"type":15,"value":185},"    VkStructureType                     sType;\n",{"type":10,"tag":155,"props":187,"children":189},{"class":157,"line":188},3,[190,195,200],{"type":10,"tag":155,"props":191,"children":192},{"style":162},[193],{"type":15,"value":194},"    const",{"type":10,"tag":155,"props":196,"children":197},{"style":162},[198],{"type":15,"value":199}," void*",{"type":10,"tag":155,"props":201,"children":202},{"style":173},[203],{"type":15,"value":204},"                         pNext;\n",{"type":10,"tag":155,"props":206,"children":208},{"class":157,"line":207},4,[209],{"type":10,"tag":155,"props":210,"children":211},{"style":173},[212],{"type":15,"value":213},"    VkVideoCodecOperationFlagBitsKHR    videoCodecOperation;\n",{"type":10,"tag":155,"props":215,"children":217},{"class":157,"line":216},5,[218],{"type":10,"tag":155,"props":219,"children":220},{"style":173},[221],{"type":15,"value":222},"    VkVideoChromaSubsamplingFlagsKHR    chromaSubsampling;\n",{"type":10,"tag":155,"props":224,"children":226},{"class":157,"line":225},6,[227],{"type":10,"tag":155,"props":228,"children":229},{"style":173},[230],{"type":15,"value":231},"    VkVideoComponentBitDepthFlagsKHR    lumaBitDepth;\n",{"type":10,"tag":155,"props":233,"children":235},{"class":157,"line":234},7,[236],{"type":10,"tag":155,"props":237,"children":238},{"style":173},[239],{"type":15,"value":240},"    VkVideoComponentBitDepthFlagsKHR    chromaBitDepth;\n",{"type":10,"tag":155,"props":242,"children":244},{"class":157,"line":243},8,[245],{"type":10,"tag":155,"props":246,"children":247},{"style":173},[248],{"type":15,"value":249},"} VkVideoProfileInfoKHR;\n",{"type":10,"tag":11,"props":251,"children":252},{},[253,255,261],{"type":15,"value":254},"A complete video profile definition includes an instance of the structure above with additional codec and use case specific parameters provided through its ",{"type":10,"tag":151,"props":256,"children":258},{"className":257},[],[259],{"type":15,"value":260},"pNext",{"type":15,"value":262}," chain.",{"type":10,"tag":11,"props":264,"children":265},{},[266,268,274],{"type":15,"value":267},"The ",{"type":10,"tag":151,"props":269,"children":271},{"className":270},[],[272],{"type":15,"value":273},"videoCodecOperation",{"type":15,"value":275}," member identifies the particular video codec and video coding operation, while the other members provide information about the content type/format, including the chroma subsampling mode and the bit depths used by the compressed video stream.",{"type":10,"tag":11,"props":277,"children":278},{},[279],{"type":15,"value":280},"This extension does not define any video codec operations. Instead, it is left to codec-specific extensions layered on top of this proposal to provide those.",{"type":10,"tag":115,"props":282,"children":284},{"id":283},"_video_queues",[285],{"type":15,"value":286},"Video Queues",{"type":10,"tag":11,"props":288,"children":289},{},[290],{"type":15,"value":291},"Support for video coding operations is exposed through new commands available for use on video-capable queue families. As it is not uncommon for devices to have separate dedicated hardware for accelerating video compression and decompression, possibly separate ones for different video codecs, implementations may expose multiple queue families with different video coding capabilities, although it is also possible for implementations to support video coding operations on the usual graphics or compute capable queue families.",{"type":10,"tag":11,"props":293,"children":294},{},[295],{"type":15,"value":296},"The set of video codec operations supported by a queue family can be retrieved using queue family property queries by including the following new output structure:",{"type":10,"tag":143,"props":298,"children":300},{"className":145,"code":299,"language":147,"meta":148,"style":148},"typedef struct VkQueueFamilyVideoPropertiesKHR {\n    VkStructureType                  sType;\n    void*                            pNext;\n    VkVideoCodecOperationFlagsKHR    videoCodecOperations;\n} VkQueueFamilyVideoPropertiesKHR;\n",[301],{"type":10,"tag":151,"props":302,"children":303},{"__ignoreMap":148},[304,320,328,341,349],{"type":10,"tag":155,"props":305,"children":306},{"class":157,"line":158},[307,311,315],{"type":10,"tag":155,"props":308,"children":309},{"style":162},[310],{"type":15,"value":165},{"type":10,"tag":155,"props":312,"children":313},{"style":162},[314],{"type":15,"value":170},{"type":10,"tag":155,"props":316,"children":317},{"style":173},[318],{"type":15,"value":319}," VkQueueFamilyVideoPropertiesKHR {\n",{"type":10,"tag":155,"props":321,"children":322},{"class":157,"line":179},[323],{"type":10,"tag":155,"props":324,"children":325},{"style":173},[326],{"type":15,"value":327},"    VkStructureType                  sType;\n",{"type":10,"tag":155,"props":329,"children":330},{"class":157,"line":188},[331,336],{"type":10,"tag":155,"props":332,"children":333},{"style":162},[334],{"type":15,"value":335},"    void*",{"type":10,"tag":155,"props":337,"children":338},{"style":173},[339],{"type":15,"value":340},"                            pNext;\n",{"type":10,"tag":155,"props":342,"children":343},{"class":157,"line":207},[344],{"type":10,"tag":155,"props":345,"children":346},{"style":173},[347],{"type":15,"value":348},"    VkVideoCodecOperationFlagsKHR    videoCodecOperations;\n",{"type":10,"tag":155,"props":350,"children":351},{"class":157,"line":216},[352],{"type":10,"tag":155,"props":353,"children":354},{"style":173},[355],{"type":15,"value":356},"} VkQueueFamilyVideoPropertiesKHR;\n",{"type":10,"tag":11,"props":358,"children":359},{},[360,362,368],{"type":15,"value":361},"After a successful query, the ",{"type":10,"tag":151,"props":363,"children":365},{"className":364},[],[366],{"type":15,"value":367},"videoCodecOperations",{"type":15,"value":369}," member will contain bits corresponding to the individual video codec operations supported by the queue family in question.",{"type":10,"tag":115,"props":371,"children":373},{"id":372},"_video_picture_resources",[374],{"type":15,"value":375},"Video Picture Resources",{"type":10,"tag":11,"props":377,"children":378},{},[379],{"type":15,"value":380},"Pictures used by video coding operations are referred to as video picture resources, and are provided to the video coding APIs through instances of the following new structure:",{"type":10,"tag":143,"props":382,"children":384},{"className":145,"code":383,"language":147,"meta":148,"style":148},"typedef struct VkVideoPictureResourceInfoKHR {\n    VkStructureType    sType;\n    const void*        pNext;\n    VkOffset2D         codedOffset;\n    VkExtent2D         codedExtent;\n    uint32_t           baseArrayLayer;\n    VkImageView        imageViewBinding;\n} VkVideoPictureResourceInfoKHR;\n",[385],{"type":10,"tag":151,"props":386,"children":387},{"__ignoreMap":148},[388,404,412,428,436,444,457,465],{"type":10,"tag":155,"props":389,"children":390},{"class":157,"line":158},[391,395,399],{"type":10,"tag":155,"props":392,"children":393},{"style":162},[394],{"type":15,"value":165},{"type":10,"tag":155,"props":396,"children":397},{"style":162},[398],{"type":15,"value":170},{"type":10,"tag":155,"props":400,"children":401},{"style":173},[402],{"type":15,"value":403}," VkVideoPictureResourceInfoKHR {\n",{"type":10,"tag":155,"props":405,"children":406},{"class":157,"line":179},[407],{"type":10,"tag":155,"props":408,"children":409},{"style":173},[410],{"type":15,"value":411},"    VkStructureType    sType;\n",{"type":10,"tag":155,"props":413,"children":414},{"class":157,"line":188},[415,419,423],{"type":10,"tag":155,"props":416,"children":417},{"style":162},[418],{"type":15,"value":194},{"type":10,"tag":155,"props":420,"children":421},{"style":162},[422],{"type":15,"value":199},{"type":10,"tag":155,"props":424,"children":425},{"style":173},[426],{"type":15,"value":427},"        pNext;\n",{"type":10,"tag":155,"props":429,"children":430},{"class":157,"line":207},[431],{"type":10,"tag":155,"props":432,"children":433},{"style":173},[434],{"type":15,"value":435},"    VkOffset2D         codedOffset;\n",{"type":10,"tag":155,"props":437,"children":438},{"class":157,"line":216},[439],{"type":10,"tag":155,"props":440,"children":441},{"style":173},[442],{"type":15,"value":443},"    VkExtent2D         codedExtent;\n",{"type":10,"tag":155,"props":445,"children":446},{"class":157,"line":225},[447,452],{"type":10,"tag":155,"props":448,"children":449},{"style":162},[450],{"type":15,"value":451},"    uint32_t",{"type":10,"tag":155,"props":453,"children":454},{"style":173},[455],{"type":15,"value":456},"           baseArrayLayer;\n",{"type":10,"tag":155,"props":458,"children":459},{"class":157,"line":234},[460],{"type":10,"tag":155,"props":461,"children":462},{"style":173},[463],{"type":15,"value":464},"    VkImageView        imageViewBinding;\n",{"type":10,"tag":155,"props":466,"children":467},{"class":157,"line":243},[468],{"type":10,"tag":155,"props":469,"children":470},{"style":173},[471],{"type":15,"value":472},"} VkVideoPictureResourceInfoKHR;\n",{"type":10,"tag":11,"props":474,"children":475},{},[476,478,484,486,492,494,500,502,508],{"type":15,"value":477},"Each video picture resource is backed by a subregion within a layer of an image object. ",{"type":10,"tag":151,"props":479,"children":481},{"className":480},[],[482],{"type":15,"value":483},"baseArrayLayer",{"type":15,"value":485}," specifies the array layer index used relative to the image view specified in ",{"type":10,"tag":151,"props":487,"children":489},{"className":488},[],[490],{"type":15,"value":491},"imageViewBinding",{"type":15,"value":493},". Depending on the specific video codec operation, ",{"type":10,"tag":151,"props":495,"children":497},{"className":496},[],[498],{"type":15,"value":499},"codedOffset",{"type":15,"value":501}," can specify an additional offset within the image subresource to read/write picture data from/to, while ",{"type":10,"tag":151,"props":503,"children":505},{"className":504},[],[506],{"type":15,"value":507},"codedExtent",{"type":15,"value":509}," typically specifies the size of the video frame.",{"type":10,"tag":11,"props":511,"children":512},{},[513,515,520,522,527],{"type":15,"value":514},"Actual semantics of ",{"type":10,"tag":151,"props":516,"children":518},{"className":517},[],[519],{"type":15,"value":499},{"type":15,"value":521}," and ",{"type":10,"tag":151,"props":523,"children":525},{"className":524},[],[526],{"type":15,"value":507},{"type":15,"value":528}," are specific to the video profile in use, as the capabilities and semantics of individual codecs varies.",{"type":10,"tag":115,"props":530,"children":532},{"id":531},"_decoded_picture_buffer",[533],{"type":15,"value":534},"Decoded Picture Buffer",{"type":10,"tag":11,"props":536,"children":537},{},[538],{"type":15,"value":539},"The chosen video compression standard may require the use of reference pictures. Such reference pictures are used by video coding operations to provide predictions of the values of samples of subsequently decoded or encoded pictures. Just like any other picture data, the decoded picture buffer (DPB) is backed by image layers. In this extension reference pictures are represented by video picture resources and corresponding image views. The DPB is the logical structure that holds this pool of reference pictures.",{"type":10,"tag":11,"props":541,"children":542},{},[543,545,551,553,559],{"type":15,"value":544},"The DPB is an indexed data structure, and individual indexed entries of the DPB are referred to as the DPB slots. The range of valid DPB slot indices is between zero and ",{"type":10,"tag":151,"props":546,"children":548},{"className":547},[],[549],{"type":15,"value":550},"N-1",{"type":15,"value":552},", where ",{"type":10,"tag":151,"props":554,"children":556},{"className":555},[],[557],{"type":15,"value":558},"N",{"type":15,"value":560}," is the capacity of the DPB. Each DPB slot can refer to one or more reference pictures. In case of typical progressive content each DPB slot usually refers to a single picture containing a video frame, but other content types like multiview or interlaced video allow multiple pictures to be associated with each slot. If a DPB slot has any pictures associated with it, then it is an active DPB slot, otherwise it is an inactive DPB slot.",{"type":10,"tag":11,"props":562,"children":563},{},[564],{"type":15,"value":565},"DPB slots can be activated with reference pictures in response to video coding operations requesting such activations. This extension does not introduce any video coding operations. Instead, layered extensions provide those. However, this extension does provide facilities to deactivate currently active DPB slots, as discussed later.",{"type":10,"tag":11,"props":567,"children":568},{},[569],{"type":15,"value":570},"In this extension, the state and the backing store of the DPB are separated as follows:",{"type":10,"tag":29,"props":572,"children":573},{},[574,579],{"type":10,"tag":33,"props":575,"children":576},{},[577],{"type":15,"value":578},"The state of individual DPB slots is maintained by video session objects.",{"type":10,"tag":33,"props":580,"children":581},{},[582],{"type":15,"value":583},"The backing store of DPB slots is provided by video picture resources and the underlying images.",{"type":10,"tag":11,"props":585,"children":586},{},[587,589,595],{"type":15,"value":588},"A single non-mipmapped image with a layer count equaling the number of DPB slots can used as the backing store of the DPB, where the picture corresponding to a particular DPB slot index is stored in the layer with the same index. The API also allows arbitrary mapping of image layers to DPB slots. Furthermore, if the ",{"type":10,"tag":151,"props":590,"children":592},{"className":591},[],[593],{"type":15,"value":594},"VK_VIDEO_CAPABILITY_SEPARATE_REFERENCE_IMAGES_BIT_KHR",{"type":15,"value":596}," capability flag is supported by the implementation for a specific video profile, then individual DPB slots can be backed by different images, potentially using a separate image for each DPB slot.",{"type":10,"tag":11,"props":598,"children":599},{},[600],{"type":15,"value":601},"Depending on the used video profile, a single DPB slot may contain more than just one picture (e.g. in case of multiview and interlaced content). In such cases the number of needed image layers may be larger than the number of DPB slots, hence the image(s) used as the backing store of the DPB have to be sized accordingly.",{"type":10,"tag":11,"props":603,"children":604},{},[605],{"type":15,"value":606},"There may also be video compression standards, video profiles, or use cases that do not require or do not support reference pictures at all. In such cases a DPB is not needed either.",{"type":10,"tag":11,"props":608,"children":609},{},[610],{"type":15,"value":611},"The responsibility of managing the DPB is split between the application and the implementation as follows:",{"type":10,"tag":29,"props":613,"children":614},{},[615,620],{"type":10,"tag":33,"props":616,"children":617},{},[618],{"type":15,"value":619},"The application maintains the association between DPB slot indices and corresponding video picture resources.",{"type":10,"tag":33,"props":621,"children":622},{},[623],{"type":15,"value":624},"The implementation maintains global and per-slot opaque reference picture metadata.",{"type":10,"tag":11,"props":626,"children":627},{},[628],{"type":15,"value":629},"In addition, the application is also responsible for managing the mapping between the codec-specific picture IDs and DPB slots, and any other codec-specific states.",{"type":10,"tag":115,"props":631,"children":633},{"id":632},"_video_session",[634],{"type":15,"value":635},"Video Session",{"type":10,"tag":11,"props":637,"children":638},{},[639],{"type":15,"value":640},"Before performing any video coding operations, the application needs to create a video session object using the following new command:",{"type":10,"tag":143,"props":642,"children":644},{"className":145,"code":643,"language":147,"meta":148,"style":148},"VKAPI_ATTR VkResult VKAPI_CALL vkCreateVideoSessionKHR(\n    VkDevice                                    device,\n    const VkVideoSessionCreateInfoKHR*          pCreateInfo,\n    const VkAllocationCallbacks*                pAllocator,\n    VkVideoSessionKHR*                          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not have to bind memory to each memory binding with a single call, but before being able to use the video session in video coding operations, all memory bindings have to be bound to compatible device memory, and the bindings are immutable for the lifetime of the video session.",{"type":10,"tag":11,"props":1459,"children":1460},{},[1461],{"type":15,"value":1462},"Once a video session object is no longer needed (and is no longer used by any pending command buffers), it can be destroyed with the following new command:",{"type":10,"tag":143,"props":1464,"children":1466},{"className":145,"code":1465,"language":147,"meta":148,"style":148},"VKAPI_ATTR void VKAPI_CALL vkDestroyVideoSessionKHR(\n    VkDevice                                    device,\n    VkVideoSessionKHR                           videoSession,\n    const VkAllocationCallbacks*                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For example, the H.264/AVC and H.265/HEVC standards require sequence and picture parameter sets (SPS and PPS) that apply to multiple video frames, layers, and sub-layers.",{"type":10,"tag":11,"props":1562,"children":1563},{},[1564],{"type":15,"value":1565},"This extension uses video session parameters objects to store such standard parameters. These objects enable storing such codec-specific parameters in a preprocessed form and enable reducing the number of parameters needed to be provided and processed by the implementation while recording video coding operations into command buffers.",{"type":10,"tag":11,"props":1567,"children":1568},{},[1569],{"type":15,"value":1570},"Video session parameters objects use a key-value storage. The way how keys are derived from the provided parameters is codec-specific (e.g. in case of H.264/AVC picture parameter sets the key consists of an SPS and PPS ID pair).",{"type":10,"tag":11,"props":1572,"children":1573},{},[1574],{"type":15,"value":1575},"The application can create a video session parameters object against a video session with the following new command:",{"type":10,"tag":143,"props":1577,"children":1579},{"className":145,"code":1578,"language":147,"meta":148,"style":148},"VKAPI_ATTR VkResult VKAPI_CALL vkCreateVideoSessionParametersKHR(\n    VkDevice                                    device,\n    const VkVideoSessionParametersCreateInfoKHR* pCreateInfo,\n    const VkAllocationCallbacks*                pAllocator,\n    VkVideoSessionParametersKHR*                pVideoSessionParameters);\n",[1580],{"type":10,"tag":151,"props":1581,"children":1582},{"__ignoreMap":148},[1583,1599,1614,1639,1662],{"type":10,"tag":155,"props":1584,"children":1585},{"class":157,"line":158},[1586,1590,1595],{"type":10,"tag":155,"props":1587,"children":1588},{"style":173},[1589],{"type":15,"value":655},{"type":10,"tag":155,"props":1591,"children":1592},{"style":658},[1593],{"type":15,"value":1594},"vkCreateVideoSessionParametersKHR",{"type":10,"tag":155,"props":1596,"children":1597},{"style":173},[1598],{"type":15,"value":666},{"type":10,"tag":155,"props":1600,"children":1601},{"class":157,"line":179},[1602,1606,1610],{"type":10,"tag":155,"props":1603,"children":1604},{"style":173},[1605],{"type":15,"value":674},{"type":10,"tag":155,"props":1607,"children":1608},{"style":677},[1609],{"type":15,"value":680},{"type":10,"tag":155,"props":1611,"children":1612},{"style":173},[1613],{"type":15,"value":685},{"type":10,"tag":155,"props":1615,"children":1616},{"class":157,"line":188},[1617,1621,1626,1630,1635],{"type":10,"tag":155,"props":1618,"children":1619},{"style":162},[1620],{"type":15,"value":194},{"type":10,"tag":155,"props":1622,"children":1623},{"style":173},[1624],{"type":15,"value":1625}," 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VkVideoSessionParametersCreateInfoKHR;\n",[1691],{"type":10,"tag":151,"props":1692,"children":1693},{"__ignoreMap":148},[1694,1710,1718,1734,1742,1750,1758],{"type":10,"tag":155,"props":1695,"children":1696},{"class":157,"line":158},[1697,1701,1705],{"type":10,"tag":155,"props":1698,"children":1699},{"style":162},[1700],{"type":15,"value":165},{"type":10,"tag":155,"props":1702,"children":1703},{"style":162},[1704],{"type":15,"value":170},{"type":10,"tag":155,"props":1706,"children":1707},{"style":173},[1708],{"type":15,"value":1709}," VkVideoSessionParametersCreateInfoKHR {\n",{"type":10,"tag":155,"props":1711,"children":1712},{"class":157,"line":179},[1713],{"type":10,"tag":155,"props":1714,"children":1715},{"style":173},[1716],{"type":15,"value":1717},"    VkStructureType                           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Applying a template happens by first adding any parameters specified in the codec-specific creation parameters, followed by adding any parameters from the template object that have a key that does not match the key of any of the already added parameters.",{"type":10,"tag":11,"props":1780,"children":1781},{},[1782],{"type":15,"value":1783},"Parameters stored in video session parameters objects are immutable to facilitate the concurrent use of the stored parameters in multiple threads. However, new parameters can be added to existing objects using the following new command:",{"type":10,"tag":143,"props":1785,"children":1787},{"className":145,"code":1786,"language":147,"meta":148,"style":148},"KAPI_ATTR VkResult VKAPI_CALL vkUpdateVideoSessionParametersKHR(\n    VkDevice                                    device,\n    VkVideoSessionParametersKHR                 videoSessionParameters,\n    const VkVideoSessionParametersUpdateInfoKHR* pUpdateInfo);\n",[1788],{"type":10,"tag":151,"props":1789,"children":1790},{"__ignoreMap":148},[1791,1808,1823,1840],{"type":10,"tag":155,"props":1792,"children":1793},{"class":157,"line":158},[1794,1799,1804],{"type":10,"tag":155,"props":1795,"children":1796},{"style":173},[1797],{"type":15,"value":1798},"KAPI_ATTR VkResult VKAPI_CALL ",{"type":10,"tag":155,"props":1800,"children":1801},{"style":658},[1802],{"type":15,"value":1803},"vkUpdateVideoSessionParametersKHR",{"type":10,"tag":155,"props":1805,"children":1806},{"style":173},[1807],{"type":15,"value":666},{"type":10,"tag":155,"props":1809,"children":1810},{"class":157,"line":179},[1811,1815,1819],{"type":10,"tag":155,"props":1812,"children":1813},{"style":173},[1814],{"type":15,"value":674},{"type":10,"tag":155,"props":1816,"children":1817},{"style":677},[1818],{"type":15,"value":680},{"type":10,"tag":155,"props":1820,"children":1821},{"style":173},[1822],{"type":15,"value":685},{"type":10,"tag":155,"props":1824,"children":1825},{"class":157,"line":188},[1826,1831,1836],{"type":10,"tag":155,"props":1827,"children":1828},{"style":173},[1829],{"type":15,"value":1830},"    VkVideoSessionParametersKHR                 ",{"type":10,"tag":155,"props":1832,"children":1833},{"style":677},[1834],{"type":15,"value":1835},"videoSessionParameters",{"type":10,"tag":155,"props":1837,"children":1838},{"style":173},[1839],{"type":15,"value":685},{"type":10,"tag":155,"props":1841,"children":1842},{"class":157,"line":207},[1843,1847,1852,1856,1861],{"type":10,"tag":155,"props":1844,"children":1845},{"style":162},[1846],{"type":15,"value":194},{"type":10,"tag":155,"props":1848,"children":1849},{"style":173},[1850],{"type":15,"value":1851}," VkVideoSessionParametersUpdateInfoKHR",{"type":10,"tag":155,"props":1853,"children":1854},{"style":162},[1855],{"type":15,"value":702},{"type":10,"tag":155,"props":1857,"children":1858},{"style":677},[1859],{"type":15,"value":1860}," pUpdateInfo",{"type":10,"tag":155,"props":1862,"children":1863},{"style":173},[1864],{"type":15,"value":758},{"type":10,"tag":11,"props":1866,"children":1867},{},[1868],{"type":15,"value":1869},"The base parameters to the command are as follows:",{"type":10,"tag":143,"props":1871,"children":1873},{"className":145,"code":1872,"language":147,"meta":148,"style":148},"typedef struct VkVideoSessionParametersUpdateInfoKHR {\n    VkStructureType    sType;\n    const void*        pNext;\n    uint32_t           updateSequenceCount;\n} VkVideoSessionParametersUpdateInfoKHR;\n",[1874],{"type":10,"tag":151,"props":1875,"children":1876},{"__ignoreMap":148},[1877,1893,1900,1915,1927],{"type":10,"tag":155,"props":1878,"children":1879},{"class":157,"line":158},[1880,1884,1888],{"type":10,"tag":155,"props":1881,"children":1882},{"style":162},[1883],{"type":15,"value":165},{"type":10,"tag":155,"props":1885,"children":1886},{"style":162},[1887],{"type":15,"value":170},{"type":10,"tag":155,"props":1889,"children":1890},{"style":173},[1891],{"type":15,"value":1892}," VkVideoSessionParametersUpdateInfoKHR {\n",{"type":10,"tag":155,"props":1894,"children":1895},{"class":157,"line":179},[1896],{"type":10,"tag":155,"props":1897,"children":1898},{"style":173},[1899],{"type":15,"value":411},{"type":10,"tag":155,"props":1901,"children":1902},{"class":157,"line":188},[1903,1907,1911],{"type":10,"tag":155,"props":1904,"children":1905},{"style":162},[1906],{"type":15,"value":194},{"type":10,"tag":155,"props":1908,"children":1909},{"style":162},[1910],{"type":15,"value":199},{"type":10,"tag":155,"props":1912,"children":1913},{"style":173},[1914],{"type":15,"value":427},{"type":10,"tag":155,"props":1916,"children":1917},{"class":157,"line":207},[1918,1922],{"type":10,"tag":155,"props":1919,"children":1920},{"style":162},[1921],{"type":15,"value":451},{"type":10,"tag":155,"props":1923,"children":1924},{"style":173},[1925],{"type":15,"value":1926},"           updateSequenceCount;\n",{"type":10,"tag":155,"props":1928,"children":1929},{"class":157,"line":216},[1930],{"type":10,"tag":155,"props":1931,"children":1932},{"style":173},[1933],{"type":15,"value":1934},"} VkVideoSessionParametersUpdateInfoKHR;\n",{"type":10,"tag":11,"props":1936,"children":1937},{},[1938,1939,1945,1947,1953,1955,1961,1963,1968],{"type":15,"value":267},{"type":10,"tag":151,"props":1940,"children":1942},{"className":1941},[],[1943],{"type":15,"value":1944},"updateSequenceCount",{"type":15,"value":1946}," parameter is used to ensure that the video session parameters objects are updated in order. To support concurrent use of the stored immutable parameters while also allowing the video session parameters object to be extended with new parameters, each object maintains an ",{"type":10,"tag":1948,"props":1949,"children":1950},"em",{},[1951],{"type":15,"value":1952},"update sequence counter",{"type":15,"value":1954}," that is set to ",{"type":10,"tag":151,"props":1956,"children":1958},{"className":1957},[],[1959],{"type":15,"value":1960},"0",{"type":15,"value":1962}," at object creation time and has to be incremented by each subsequent update operation by specifying an ",{"type":10,"tag":151,"props":1964,"children":1966},{"className":1965},[],[1967],{"type":15,"value":1944},{"type":15,"value":1969}," that equals the current update sequence counter of the object plus one.",{"type":10,"tag":11,"props":1971,"children":1972},{},[1973],{"type":15,"value":1974},"Some codecs permit updating previously supplied parameters. As the parameters stored in the video session parameters objects are immutable, if a parameter update is necessary, the application has the following options:",{"type":10,"tag":29,"props":1976,"children":1977},{},[1978,1983],{"type":10,"tag":33,"props":1979,"children":1980},{},[1981],{"type":15,"value":1982},"Cache the set of parameters on the application side and create a new video session parameters object adding all the parameters with appropriate changes, as necessary; or",{"type":10,"tag":33,"props":1984,"children":1985},{},[1986],{"type":15,"value":1987},"Create a new video session parameters object providing only the updated parameters and the previously used object as the template, which ensures that parameters not specified at creation time will be copied unmodified from the template object.",{"type":10,"tag":11,"props":1989,"children":1990},{},[1991],{"type":15,"value":1992},"Another case when a new video session parameters object may need to be created is when the capacity of the current object is exhausted. Each video session parameters object is created with a specific capacity, hence if that capacity later turns out to be insufficient, a new object with a larger capacity should be created, typically using the old one as a template.",{"type":10,"tag":11,"props":1994,"children":1995},{},[1996],{"type":15,"value":1997},"The application has to track the capacity and the keys of currently stored parameters for each video session parameters object in order to be able to determine when a new object needs to be created due to a change to an existing parameter or due to exceeding the capacity of the existing object.",{"type":10,"tag":11,"props":1999,"children":2000},{},[2001],{"type":15,"value":2002},"During command buffer recording, it is the responsibility of the application to provide the video session parameters object containing the necessary parameters for processing the portion of the video stream in question.",{"type":10,"tag":11,"props":2004,"children":2005},{},[2006,2008,2013],{"type":15,"value":2007},"The expected usage model for video session parameters object is a single-producer-multiple-consumer one. Typically a single thread processing the video stream is expected to update the corresponding parameters object, or create new ones when necessary, while at the same time any thread can record video coding operations into command buffers referring to parameters previously added to the object. If, for some reason, the application wants to update a given video session parameters object from multiple threads, it is responsible to provide appropriate mutual exclusion so that no two threads update the same object concurrently, and that the used ",{"type":10,"tag":151,"props":2009,"children":2011},{"className":2010},[],[2012],{"type":15,"value":1944},{"type":15,"value":2014}," values are sequentially increasing.",{"type":10,"tag":11,"props":2016,"children":2017},{},[2018],{"type":15,"value":2019},"Once a video session parameters object is no longer needed (and is no longer used by any pending command buffers), it can be destroyed with the following new command:",{"type":10,"tag":143,"props":2021,"children":2023},{"className":145,"code":2022,"language":147,"meta":148,"style":148},"VKAPI_ATTR void VKAPI_CALL vkDestroyVideoSessionParametersKHR(\n    VkDevice                                    device,\n    VkVideoSessionParametersKHR                 videoSessionParameters,\n    const VkAllocationCallbacks*                pAllocator);\n",[2024],{"type":10,"tag":151,"props":2025,"children":2026},{"__ignoreMap":148},[2027,2051,2066,2081],{"type":10,"tag":155,"props":2028,"children":2029},{"class":157,"line":158},[2030,2034,2038,2042,2047],{"type":10,"tag":155,"props":2031,"children":2032},{"style":173},[2033],{"type":15,"value":1477},{"type":10,"tag":155,"props":2035,"children":2036},{"style":162},[2037],{"type":15,"value":1482},{"type":10,"tag":155,"props":2039,"children":2040},{"style":173},[2041],{"type":15,"value":1487},{"type":10,"tag":155,"props":2043,"children":2044},{"style":658},[2045],{"type":15,"value":2046},"vkDestroyVideoSessionParametersKHR",{"type":10,"tag":155,"props":2048,"children":2049},{"style":173},[2050],{"type":15,"value":666},{"type":10,"tag":155,"props":2052,"children":2053},{"class":157,"line":179},[2054,2058,2062],{"type":10,"tag":155,"props":2055,"children":2056},{"style":173},[2057],{"type":15,"value":674},{"type":10,"tag":155,"props":2059,"children":2060},{"style":677},[2061],{"type":15,"value":680},{"type":10,"tag":155,"props":2063,"children":2064},{"style":173},[2065],{"type":15,"value":685},{"type":10,"tag":155,"props":2067,"children":2068},{"class":157,"line":188},[2069,2073,2077],{"type":10,"tag":155,"props":2070,"children":2071},{"style":173},[2072],{"type":15,"value":1830},{"type":10,"tag":155,"props":2074,"children":2075},{"style":677},[2076],{"type":15,"value":1835},{"type":10,"tag":155,"props":2078,"children":2079},{"style":173},[2080],{"type":15,"value":685},{"type":10,"tag":155,"props":2082,"children":2083},{"class":157,"line":207},[2084,2088,2092,2096,2100],{"type":10,"tag":155,"props":2085,"children":2086},{"style":162},[2087],{"type":15,"value":194},{"type":10,"tag":155,"props":2089,"children":2090},{"style":173},[2091],{"type":15,"value":723},{"type":10,"tag":155,"props":2093,"children":2094},{"style":162},[2095],{"type":15,"value":702},{"type":10,"tag":155,"props":2097,"children":2098},{"style":677},[2099],{"type":15,"value":732},{"type":10,"tag":155,"props":2101,"children":2102},{"style":173},[2103],{"type":15,"value":758},{"type":10,"tag":11,"props":2105,"children":2106},{},[2107],{"type":15,"value":2108},"This extension does not define any parameter types. Instead, layered codec-specific extensions define those. Some codecs may not need parameters at all, in which case no video session parameters objects need to be created or managed.",{"type":10,"tag":115,"props":2110,"children":2112},{"id":2111},"_command_buffer_commands",[2113],{"type":15,"value":2114},"Command Buffer Commands",{"type":10,"tag":11,"props":2116,"children":2117},{},[2118],{"type":15,"value":2119},"This extension does not introduce any specific video coding operations, however, it does introduce new commands that can be recorded into video-capable command buffers (created from command pools that target queue families with video capabilities).",{"type":10,"tag":11,"props":2121,"children":2122},{},[2123,2125,2130],{"type":15,"value":2124},"Applications can record video coding operations into such a command buffer only within a ",{"type":10,"tag":1948,"props":2126,"children":2127},{},[2128],{"type":15,"value":2129},"video coding scope",{"type":15,"value":2131},". The following new command begins such a video coding scope within the command buffer:",{"type":10,"tag":143,"props":2133,"children":2135},{"className":145,"code":2134,"language":147,"meta":148,"style":148},"VKAPI_ATTR void VKAPI_CALL vkCmdBeginVideoCodingKHR(\n    VkCommandBuffer                             commandBuffer,\n    const VkVideoBeginCodingInfoKHR*            pBeginInfo);\n",[2136],{"type":10,"tag":151,"props":2137,"children":2138},{"__ignoreMap":148},[2139,2163,2180],{"type":10,"tag":155,"props":2140,"children":2141},{"class":157,"line":158},[2142,2146,2150,2154,2159],{"type":10,"tag":155,"props":2143,"children":2144},{"style":173},[2145],{"type":15,"value":1477},{"type":10,"tag":155,"props":2147,"children":2148},{"style":162},[2149],{"type":15,"value":1482},{"type":10,"tag":155,"props":2151,"children":2152},{"style":173},[2153],{"type":15,"value":1487},{"type":10,"tag":155,"props":2155,"children":2156},{"style":658},[2157],{"type":15,"value":2158},"vkCmdBeginVideoCodingKHR",{"type":10,"tag":155,"props":2160,"children":2161},{"style":173},[2162],{"type":15,"value":666},{"type":10,"tag":155,"props":2164,"children":2165},{"class":157,"line":179},[2166,2171,2176],{"type":10,"tag":155,"props":2167,"children":2168},{"style":173},[2169],{"type":15,"value":2170},"    VkCommandBuffer                             ",{"type":10,"tag":155,"props":2172,"children":2173},{"style":677},[2174],{"type":15,"value":2175},"commandBuffer",{"type":10,"tag":155,"props":2177,"children":2178},{"style":173},[2179],{"type":15,"value":685},{"type":10,"tag":155,"props":2181,"children":2182},{"class":157,"line":188},[2183,2187,2192,2196,2201],{"type":10,"tag":155,"props":2184,"children":2185},{"style":162},[2186],{"type":15,"value":194},{"type":10,"tag":155,"props":2188,"children":2189},{"style":173},[2190],{"type":15,"value":2191}," VkVideoBeginCodingInfoKHR",{"type":10,"tag":155,"props":2193,"children":2194},{"style":162},[2195],{"type":15,"value":702},{"type":10,"tag":155,"props":2197,"children":2198},{"style":677},[2199],{"type":15,"value":2200},"            pBeginInfo",{"type":10,"tag":155,"props":2202,"children":2203},{"style":173},[2204],{"type":15,"value":758},{"type":10,"tag":11,"props":2206,"children":2207},{},[2208],{"type":15,"value":2209},"This command takes the following parameters:",{"type":10,"tag":143,"props":2211,"children":2213},{"className":145,"code":2212,"language":147,"meta":148,"style":148},"typedef struct VkVideoBeginCodingInfoKHR {\n    VkStructureType                       sType;\n    const void*                           pNext;\n    VkVideoBeginCodingFlagsKHR            flags;\n    VkVideoSessionKHR                     videoSession;\n    VkVideoSessionParametersKHR           videoSessionParameters;\n    uint32_t                              referenceSlotCount;\n    const VkVideoReferenceSlotInfoKHR*    pReferenceSlots;\n} VkVideoBeginCodingInfoKHR;\n",[2214],{"type":10,"tag":151,"props":2215,"children":2216},{"__ignoreMap":148},[2217,2233,2241,2257,2265,2273,2281,2293,2314],{"type":10,"tag":155,"props":2218,"children":2219},{"class":157,"line":158},[2220,2224,2228],{"type":10,"tag":155,"props":2221,"children":2222},{"style":162},[2223],{"type":15,"value":165},{"type":10,"tag":155,"props":2225,"children":2226},{"style":162},[2227],{"type":15,"value":170},{"type":10,"tag":155,"props":2229,"children":2230},{"style":173},[2231],{"type":15,"value":2232}," VkVideoBeginCodingInfoKHR {\n",{"type":10,"tag":155,"props":2234,"children":2235},{"class":157,"line":179},[2236],{"type":10,"tag":155,"props":2237,"children":2238},{"style":173},[2239],{"type":15,"value":2240},"    VkStructureType                       sType;\n",{"type":10,"tag":155,"props":2242,"children":2243},{"class":157,"line":188},[2244,2248,2252],{"type":10,"tag":155,"props":2245,"children":2246},{"style":162},[2247],{"type":15,"value":194},{"type":10,"tag":155,"props":2249,"children":2250},{"style":162},[2251],{"type":15,"value":199},{"type":10,"tag":155,"props":2253,"children":2254},{"style":173},[2255],{"type":15,"value":2256},"                           pNext;\n",{"type":10,"tag":155,"props":2258,"children":2259},{"class":157,"line":207},[2260],{"type":10,"tag":155,"props":2261,"children":2262},{"style":173},[2263],{"type":15,"value":2264},"    VkVideoBeginCodingFlagsKHR            flags;\n",{"type":10,"tag":155,"props":2266,"children":2267},{"class":157,"line":216},[2268],{"type":10,"tag":155,"props":2269,"children":2270},{"style":173},[2271],{"type":15,"value":2272},"    VkVideoSessionKHR                     videoSession;\n",{"type":10,"tag":155,"props":2274,"children":2275},{"class":157,"line":225},[2276],{"type":10,"tag":155,"props":2277,"children":2278},{"style":173},[2279],{"type":15,"value":2280},"    VkVideoSessionParametersKHR           videoSessionParameters;\n",{"type":10,"tag":155,"props":2282,"children":2283},{"class":157,"line":234},[2284,2288],{"type":10,"tag":155,"props":2285,"children":2286},{"style":162},[2287],{"type":15,"value":451},{"type":10,"tag":155,"props":2289,"children":2290},{"style":173},[2291],{"type":15,"value":2292},"                              referenceSlotCount;\n",{"type":10,"tag":155,"props":2294,"children":2295},{"class":157,"line":243},[2296,2300,2305,2309],{"type":10,"tag":155,"props":2297,"children":2298},{"style":162},[2299],{"type":15,"value":194},{"type":10,"tag":155,"props":2301,"children":2302},{"style":173},[2303],{"type":15,"value":2304}," 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As the video session object is a stateful object providing the device state context needed to perform video coding operations, portions of a video stream can be processed across multiple video coding scopes and multiple command buffers using the same video session object. It is typical, for example, to submit a single command buffer with a single video coding scope encapsulating a single video coding operation (let that be a video decode or encode operation) that performs the decompression or compression of a single video frame produced or consumed by other Vulkan commands.",{"type":10,"tag":11,"props":2335,"children":2336},{},[2337,2342],{"type":10,"tag":151,"props":2338,"children":2340},{"className":2339},[],[2341],{"type":15,"value":1835},{"type":15,"value":2343}," provides the optional parameters object to use with the video coding operations, depending on whether one is needed according to the codec-specific requirements.",{"type":10,"tag":11,"props":2345,"children":2346},{},[2347],{"type":15,"value":2348},"This command binds the specified video session and (if present) video session parameters objects to the command buffer for the duration of the video coding scope.",{"type":10,"tag":11,"props":2350,"children":2351},{},[2352],{"type":15,"value":2353},"In addition, the application can provide a list of reference picture resources, with initial information about which DPB slots they may be currently associated with. This information is provided through an array of the following new structure:",{"type":10,"tag":143,"props":2355,"children":2357},{"className":145,"code":2356,"language":147,"meta":148,"style":148},"typedef struct VkVideoReferenceSlotInfoKHR {\n    VkStructureType                         sType;\n    const void*                             pNext;\n    int32_t                                 slotIndex;\n    const VkVideoPictureResourceInfoKHR*    pPictureResource;\n} VkVideoReferenceSlotInfoKHR;\n",[2358],{"type":10,"tag":151,"props":2359,"children":2360},{"__ignoreMap":148},[2361,2377,2385,2401,2414,2435],{"type":10,"tag":155,"props":2362,"children":2363},{"class":157,"line":158},[2364,2368,2372],{"type":10,"tag":155,"props":2365,"children":2366},{"style":162},[2367],{"type":15,"value":165},{"type":10,"tag":155,"props":2369,"children":2370},{"style":162},[2371],{"type":15,"value":170},{"type":10,"tag":155,"props":2373,"children":2374},{"style":173},[2375],{"type":15,"value":2376}," VkVideoReferenceSlotInfoKHR {\n",{"type":10,"tag":155,"props":2378,"children":2379},{"class":157,"line":179},[2380],{"type":10,"tag":155,"props":2381,"children":2382},{"style":173},[2383],{"type":15,"value":2384},"    VkStructureType                         sType;\n",{"type":10,"tag":155,"props":2386,"children":2387},{"class":157,"line":188},[2388,2392,2396],{"type":10,"tag":155,"props":2389,"children":2390},{"style":162},[2391],{"type":15,"value":194},{"type":10,"tag":155,"props":2393,"children":2394},{"style":162},[2395],{"type":15,"value":199},{"type":10,"tag":155,"props":2397,"children":2398},{"style":173},[2399],{"type":15,"value":2400},"                             pNext;\n",{"type":10,"tag":155,"props":2402,"children":2403},{"class":157,"line":207},[2404,2409],{"type":10,"tag":155,"props":2405,"children":2406},{"style":162},[2407],{"type":15,"value":2408},"    int32_t",{"type":10,"tag":155,"props":2410,"children":2411},{"style":173},[2412],{"type":15,"value":2413},"                                 slotIndex;\n",{"type":10,"tag":155,"props":2415,"children":2416},{"class":157,"line":216},[2417,2421,2426,2430],{"type":10,"tag":155,"props":2418,"children":2419},{"style":162},[2420],{"type":15,"value":194},{"type":10,"tag":155,"props":2422,"children":2423},{"style":173},[2424],{"type":15,"value":2425}," VkVideoPictureResourceInfoKHR",{"type":10,"tag":155,"props":2427,"children":2428},{"style":162},[2429],{"type":15,"value":702},{"type":10,"tag":155,"props":2431,"children":2432},{"style":173},[2433],{"type":15,"value":2434},"    pPictureResource;\n",{"type":10,"tag":155,"props":2436,"children":2437},{"class":157,"line":225},[2438],{"type":10,"tag":155,"props":2439,"children":2440},{"style":173},[2441],{"type":15,"value":2442},"} VkVideoReferenceSlotInfoKHR;\n",{"type":10,"tag":11,"props":2444,"children":2445},{},[2446,2448,2454],{"type":15,"value":2447},"The list of video picture resources provided here is needed because the ",{"type":10,"tag":151,"props":2449,"children":2451},{"className":2450},[],[2452],{"type":15,"value":2453},"vkCmdBeginVideoScopeKHR",{"type":15,"value":2455}," command also acts as a resource binding command, as the provided list defines the set of resources that can be used as reconstructed or reference pictures by video coding operations within the video coding scope.",{"type":10,"tag":11,"props":2457,"children":2458},{},[2459,2461,2467],{"type":15,"value":2460},"The DPB slot association information needs to be provided because it is the application’s responsibility to maintain the association between DPB slot indices and corresponding video picture resources. If a video picture resource is not currently associated with any DPB slot, but it is planned to be associated with one within this video coding scope (e.g. by using it as the target of picture reconstruction), then it has to be included in the list with a negative ",{"type":10,"tag":151,"props":2462,"children":2464},{"className":2463},[],[2465],{"type":15,"value":2466},"slotIndex",{"type":15,"value":2468}," value, indicating that it is a bound reference picture resource, but one that is not currently associated with any DPB slot.",{"type":10,"tag":11,"props":2470,"children":2471},{},[2472,2473,2478,2480,2485,2487,2493],{"type":15,"value":267},{"type":10,"tag":151,"props":2474,"children":2476},{"className":2475},[],[2477],{"type":15,"value":2158},{"type":15,"value":2479}," command also allows the application to deactivate previously activated DPB slots. This can be done by passing the index of the DPB slot to deactivate in ",{"type":10,"tag":151,"props":2481,"children":2483},{"className":2482},[],[2484],{"type":15,"value":2466},{"type":15,"value":2486}," but not specifying any associated picture resource(",{"type":10,"tag":151,"props":2488,"children":2490},{"className":2489},[],[2491],{"type":15,"value":2492},"pPictureResource = NULL",{"type":15,"value":2494},"). Deactivating the DPB slot removes all associated reference pictures which allows the application to e.g. reuse or deallocate the corresponding memory resources.",{"type":10,"tag":11,"props":2496,"children":2497},{},[2498],{"type":15,"value":2499},"The associations between these bound video picture resources and DPB slots can also change during the course of the video coding scope in response to video coding operations.",{"type":10,"tag":11,"props":2501,"children":2502},{},[2503],{"type":15,"value":2504},"Control and state changing operations can be issued within a video coding scope with the following new command:",{"type":10,"tag":143,"props":2506,"children":2508},{"className":145,"code":2507,"language":147,"meta":148,"style":148},"VKAPI_ATTR void VKAPI_CALL vkCmdControlVideoCodingKHR(\n    VkCommandBuffer                             commandBuffer,\n    const VkVideoCodingControlInfoKHR*          pCodingControlInfo);\n",[2509],{"type":10,"tag":151,"props":2510,"children":2511},{"__ignoreMap":148},[2512,2536,2551],{"type":10,"tag":155,"props":2513,"children":2514},{"class":157,"line":158},[2515,2519,2523,2527,2532],{"type":10,"tag":155,"props":2516,"children":2517},{"style":173},[2518],{"type":15,"value":1477},{"type":10,"tag":155,"props":2520,"children":2521},{"style":162},[2522],{"type":15,"value":1482},{"type":10,"tag":155,"props":2524,"children":2525},{"style":173},[2526],{"type":15,"value":1487},{"type":10,"tag":155,"props":2528,"children":2529},{"style":658},[2530],{"type":15,"value":2531},"vkCmdControlVideoCodingKHR",{"type":10,"tag":155,"props":2533,"children":2534},{"style":173},[2535],{"type":15,"value":666},{"type":10,"tag":155,"props":2537,"children":2538},{"class":157,"line":179},[2539,2543,2547],{"type":10,"tag":155,"props":2540,"children":2541},{"style":173},[2542],{"type":15,"value":2170},{"type":10,"tag":155,"props":2544,"children":2545},{"style":677},[2546],{"type":15,"value":2175},{"type":10,"tag":155,"props":2548,"children":2549},{"style":173},[2550],{"type":15,"value":685},{"type":10,"tag":155,"props":2552,"children":2553},{"class":157,"line":188},[2554,2558,2563,2567,2572],{"type":10,"tag":155,"props":2555,"children":2556},{"style":162},[2557],{"type":15,"value":194},{"type":10,"tag":155,"props":2559,"children":2560},{"style":173},[2561],{"type":15,"value":2562}," VkVideoCodingControlInfoKHR",{"type":10,"tag":155,"props":2564,"children":2565},{"style":162},[2566],{"type":15,"value":702},{"type":10,"tag":155,"props":2568,"children":2569},{"style":677},[2570],{"type":15,"value":2571},"          pCodingControlInfo",{"type":10,"tag":155,"props":2573,"children":2574},{"style":173},[2575],{"type":15,"value":758},{"type":10,"tag":11,"props":2577,"children":2578},{},[2579,2581,2587,2589,2594],{"type":15,"value":2580},"This extension introduces only a single control flag called ",{"type":10,"tag":151,"props":2582,"children":2584},{"className":2583},[],[2585],{"type":15,"value":2586},"VK_VIDEO_CODING_CONTROL_RESET_BIT_KHR",{"type":15,"value":2588}," that is used to initialize the video session object. Before being able to record actual video coding operations against a bound video session object, it has to be initialized (reset) using this command by including the ",{"type":10,"tag":151,"props":2590,"children":2592},{"className":2591},[],[2593],{"type":15,"value":2586},{"type":15,"value":2595}," flag. The reset operation also returns all DPB slots of the video session to the inactive state and removes any DPB slot index associations.",{"type":10,"tag":11,"props":2597,"children":2598},{},[2599],{"type":15,"value":2600},"After processing a video stream using a video session, the reset operation can also be used to return the video session back to the initial state. This enables reusing a single video session object to process different, independent video sequences.",{"type":10,"tag":11,"props":2602,"children":2603},{},[2604],{"type":15,"value":2605},"A video coding scope can be ended with the following new command:",{"type":10,"tag":143,"props":2607,"children":2609},{"className":145,"code":2608,"language":147,"meta":148,"style":148},"VKAPI_ATTR void VKAPI_CALL vkCmdEndVideoCodingKHR(\n    VkCommandBuffer                             commandBuffer,\n    const VkVideoEndCodingInfoKHR*              pEndCodingInfo);\n",[2610],{"type":10,"tag":151,"props":2611,"children":2612},{"__ignoreMap":148},[2613,2637,2652],{"type":10,"tag":155,"props":2614,"children":2615},{"class":157,"line":158},[2616,2620,2624,2628,2633],{"type":10,"tag":155,"props":2617,"children":2618},{"style":173},[2619],{"type":15,"value":1477},{"type":10,"tag":155,"props":2621,"children":2622},{"style":162},[2623],{"type":15,"value":1482},{"type":10,"tag":155,"props":2625,"children":2626},{"style":173},[2627],{"type":15,"value":1487},{"type":10,"tag":155,"props":2629,"children":2630},{"style":658},[2631],{"type":15,"value":2632},"vkCmdEndVideoCodingKHR",{"type":10,"tag":155,"props":2634,"children":2635},{"style":173},[2636],{"type":15,"value":666},{"type":10,"tag":155,"props":2638,"children":2639},{"class":157,"line":179},[2640,2644,2648],{"type":10,"tag":155,"props":2641,"children":2642},{"style":173},[2643],{"type":15,"value":2170},{"type":10,"tag":155,"props":2645,"children":2646},{"style":677},[2647],{"type":15,"value":2175},{"type":10,"tag":155,"props":2649,"children":2650},{"style":173},[2651],{"type":15,"value":685},{"type":10,"tag":155,"props":2653,"children":2654},{"class":157,"line":188},[2655,2659,2664,2668,2673],{"type":10,"tag":155,"props":2656,"children":2657},{"style":162},[2658],{"type":15,"value":194},{"type":10,"tag":155,"props":2660,"children":2661},{"style":173},[2662],{"type":15,"value":2663}," VkVideoEndCodingInfoKHR",{"type":10,"tag":155,"props":2665,"children":2666},{"style":162},[2667],{"type":15,"value":702},{"type":10,"tag":155,"props":2669,"children":2670},{"style":677},[2671],{"type":15,"value":2672},"              pEndCodingInfo",{"type":10,"tag":155,"props":2674,"children":2675},{"style":173},[2676],{"type":15,"value":758},{"type":10,"tag":115,"props":2678,"children":2680},{"id":2679},"_status_queries",[2681],{"type":15,"value":2682},"Status Queries",{"type":10,"tag":11,"props":2684,"children":2685},{},[2686],{"type":15,"value":2687},"Compressing and decompressing video content is a non-trivial process that involves complex codec-specific semantics and requirements. Accordingly, it is possible for a video coding operation to fail when processing input content that is not conformant to the rules defined by the used video compression standard, thus determining whether a particular video coding operation completed successfully can only happen at runtime.",{"type":10,"tag":11,"props":2689,"children":2690},{},[2691,2693,2699],{"type":15,"value":2692},"In order to facilitate this, this extension also introduces a new ",{"type":10,"tag":151,"props":2694,"children":2696},{"className":2695},[],[2697],{"type":15,"value":2698},"VK_QUERY_TYPE_RESULT_STATUS_ONLY_KHR",{"type":15,"value":2700}," query type that enables getting feedback about the status of operations. Support for this new query type can be queried for each queue family index through the following new output structure:",{"type":10,"tag":143,"props":2702,"children":2704},{"className":145,"code":2703,"language":147,"meta":148,"style":148},"typedef struct VkQueueFamilyQueryResultStatusPropertiesKHR {\n    VkStructureType    sType;\n    void*              pNext;\n    VkBool32           queryResultStatusSupport;\n} VkQueueFamilyQueryResultStatusPropertiesKHR;\n",[2705],{"type":10,"tag":151,"props":2706,"children":2707},{"__ignoreMap":148},[2708,2724,2731,2743,2751],{"type":10,"tag":155,"props":2709,"children":2710},{"class":157,"line":158},[2711,2715,2719],{"type":10,"tag":155,"props":2712,"children":2713},{"style":162},[2714],{"type":15,"value":165},{"type":10,"tag":155,"props":2716,"children":2717},{"style":162},[2718],{"type":15,"value":170},{"type":10,"tag":155,"props":2720,"children":2721},{"style":173},[2722],{"type":15,"value":2723}," VkQueueFamilyQueryResultStatusPropertiesKHR {\n",{"type":10,"tag":155,"props":2725,"children":2726},{"class":157,"line":179},[2727],{"type":10,"tag":155,"props":2728,"children":2729},{"style":173},[2730],{"type":15,"value":411},{"type":10,"tag":155,"props":2732,"children":2733},{"class":157,"line":188},[2734,2738],{"type":10,"tag":155,"props":2735,"children":2736},{"style":162},[2737],{"type":15,"value":335},{"type":10,"tag":155,"props":2739,"children":2740},{"style":173},[2741],{"type":15,"value":2742},"              pNext;\n",{"type":10,"tag":155,"props":2744,"children":2745},{"class":157,"line":207},[2746],{"type":10,"tag":155,"props":2747,"children":2748},{"style":173},[2749],{"type":15,"value":2750},"    VkBool32           queryResultStatusSupport;\n",{"type":10,"tag":155,"props":2752,"children":2753},{"class":157,"line":216},[2754],{"type":10,"tag":155,"props":2755,"children":2756},{"style":173},[2757],{"type":15,"value":2758},"} VkQueueFamilyQueryResultStatusPropertiesKHR;\n",{"type":10,"tag":11,"props":2760,"children":2761},{},[2762,2764,2770,2771,2777,2779,2784,2785,2790],{"type":15,"value":2763},"Queries also work slightly differently within a video coding scope due to the special behavior of video coding operations. Instead of a query being bound to the scope determined by the corresponding ",{"type":10,"tag":151,"props":2765,"children":2767},{"className":2766},[],[2768],{"type":15,"value":2769},"vkCmdBeginQuery",{"type":15,"value":521},{"type":10,"tag":151,"props":2772,"children":2774},{"className":2773},[],[2775],{"type":15,"value":2776},"vkCmdEndQuery",{"type":15,"value":2778}," calls, in case of video coding each video coding operation consumes its own query slot. Thus if a command issues multiple video coding operations, then those may consume multiple subsequent query slots within the query pool. However, as no new commands are introduced by this extension to start queries with multiple activatable query slots, currently only a single video coding operation is allowed between a ",{"type":10,"tag":151,"props":2780,"children":2782},{"className":2781},[],[2783],{"type":15,"value":2769},{"type":15,"value":521},{"type":10,"tag":151,"props":2786,"children":2788},{"className":2787},[],[2789],{"type":15,"value":2776},{"type":15,"value":2791}," call.",{"type":10,"tag":11,"props":2793,"children":2794},{},[2795],{"type":15,"value":2796},"An unsuccessfully completed video coding operation may also have an effect on subsequently executed video coding operations against the same video session. In particular, if a video coding operation requests the setup (activation) of a DPB slot with a reference picture and that video coding operation completes unsuccessfully, then the corresponding DPB slot will end up having an invalid picture reference. This will cause subsequent video coding operations using reference pictures associated with that DPB slot to produce unexpected results, and may even cause such dependent video coding operations themselves to complete unsuccessfully in response to the invalid input data.",{"type":10,"tag":11,"props":2798,"children":2799},{},[2800],{"type":15,"value":2801},"Thus applications have to make sure that they use queries to determine the completion status of video coding operations in order to be able to detect if outputs may contain undefined data and potentially drop those, depending on the particular use case.",{"type":10,"tag":11,"props":2803,"children":2804},{},[2805,2807,2812,2814,2820],{"type":15,"value":2806},"The mechanisms introduced by the new query type are designed to be generic. While video coding scopes only allow using ",{"type":10,"tag":151,"props":2808,"children":2810},{"className":2809},[],[2811],{"type":15,"value":2698},{"type":15,"value":2813}," queries (at least without layered extensions introducing further video-compatible query types), the new ",{"type":10,"tag":151,"props":2815,"children":2817},{"className":2816},[],[2818],{"type":15,"value":2819},"VK_QUERY_RESULT_WITH_STATUS_BIT_KHR",{"type":15,"value":2821}," bit can also be used with other query types, replacing the traditional boolean availability information with an enumeration based status value:",{"type":10,"tag":143,"props":2823,"children":2825},{"className":145,"code":2824,"language":147,"meta":148,"style":148},"typedef enum VkQueryResultStatusKHR {\n    VK_QUERY_RESULT_STATUS_ERROR_KHR = -1,\n    VK_QUERY_RESULT_STATUS_NOT_READY_KHR = 0,\n    VK_QUERY_RESULT_STATUS_COMPLETE_KHR = 1,\n    VK_QUERY_RESULT_STATUS_MAX_ENUM_KHR = 0x7FFFFFFF\n} VkQueryResultStatusKHR;\n",[2826],{"type":10,"tag":151,"props":2827,"children":2828},{"__ignoreMap":148},[2829,2846,2874,2895,2916,2938],{"type":10,"tag":155,"props":2830,"children":2831},{"class":157,"line":158},[2832,2836,2841],{"type":10,"tag":155,"props":2833,"children":2834},{"style":162},[2835],{"type":15,"value":165},{"type":10,"tag":155,"props":2837,"children":2838},{"style":162},[2839],{"type":15,"value":2840}," enum",{"type":10,"tag":155,"props":2842,"children":2843},{"style":173},[2844],{"type":15,"value":2845}," VkQueryResultStatusKHR {\n",{"type":10,"tag":155,"props":2847,"children":2848},{"class":157,"line":179},[2849,2854,2859,2864,2870],{"type":10,"tag":155,"props":2850,"children":2851},{"style":173},[2852],{"type":15,"value":2853},"    VK_QUERY_RESULT_STATUS_ERROR_KHR ",{"type":10,"tag":155,"props":2855,"children":2856},{"style":162},[2857],{"type":15,"value":2858},"=",{"type":10,"tag":155,"props":2860,"children":2861},{"style":162},[2862],{"type":15,"value":2863}," -",{"type":10,"tag":155,"props":2865,"children":2867},{"style":2866},"--shiki-default:#0550AE;--shiki-dark:#79C0FF",[2868],{"type":15,"value":2869},"1",{"type":10,"tag":155,"props":2871,"children":2872},{"style":173},[2873],{"type":15,"value":685},{"type":10,"tag":155,"props":2875,"children":2876},{"class":157,"line":188},[2877,2882,2886,2891],{"type":10,"tag":155,"props":2878,"children":2879},{"style":173},[2880],{"type":15,"value":2881},"    VK_QUERY_RESULT_STATUS_NOT_READY_KHR ",{"type":10,"tag":155,"props":2883,"children":2884},{"style":162},[2885],{"type":15,"value":2858},{"type":10,"tag":155,"props":2887,"children":2888},{"style":2866},[2889],{"type":15,"value":2890}," 0",{"type":10,"tag":155,"props":2892,"children":2893},{"style":173},[2894],{"type":15,"value":685},{"type":10,"tag":155,"props":2896,"children":2897},{"class":157,"line":207},[2898,2903,2907,2912],{"type":10,"tag":155,"props":2899,"children":2900},{"style":173},[2901],{"type":15,"value":2902},"    VK_QUERY_RESULT_STATUS_COMPLETE_KHR ",{"type":10,"tag":155,"props":2904,"children":2905},{"style":162},[2906],{"type":15,"value":2858},{"type":10,"tag":155,"props":2908,"children":2909},{"style":2866},[2910],{"type":15,"value":2911}," 1",{"type":10,"tag":155,"props":2913,"children":2914},{"style":173},[2915],{"type":15,"value":685},{"type":10,"tag":155,"props":2917,"children":2918},{"class":157,"line":216},[2919,2924,2928,2933],{"type":10,"tag":155,"props":2920,"children":2921},{"style":173},[2922],{"type":15,"value":2923},"    VK_QUERY_RESULT_STATUS_MAX_ENUM_KHR ",{"type":10,"tag":155,"props":2925,"children":2926},{"style":162},[2927],{"type":15,"value":2858},{"type":10,"tag":155,"props":2929,"children":2930},{"style":162},[2931],{"type":15,"value":2932}," 0x",{"type":10,"tag":155,"props":2934,"children":2935},{"style":2866},[2936],{"type":15,"value":2937},"7FFFFFFF\n",{"type":10,"tag":155,"props":2939,"children":2940},{"class":157,"line":225},[2941],{"type":10,"tag":155,"props":2942,"children":2943},{"style":173},[2944],{"type":15,"value":2945},"} VkQueryResultStatusKHR;\n",{"type":10,"tag":11,"props":2947,"children":2948},{},[2949],{"type":15,"value":2950},"In general, when retrieving the result status of a query, negative values indicate some sort of failure (unsuccessful completion of operations) and positive values indicate success.",{"type":10,"tag":115,"props":2952,"children":2954},{"id":2953},"_device_memory_management",[2955],{"type":15,"value":2956},"Device Memory Management",{"type":10,"tag":11,"props":2958,"children":2959},{},[2960],{"type":15,"value":2961},"In this extension the application has complete control over how and when system resources are used. This extension provides the following tools to enable optimal usage of device and host memory resources:",{"type":10,"tag":29,"props":2963,"children":2964},{},[2965,2970,2975,2980],{"type":10,"tag":33,"props":2966,"children":2967},{},[2968],{"type":15,"value":2969},"The application can manage the number of allocated output and input pictures, and can dynamically grow or shrink the DPB holding the reference pictures, based on the changing video content requirements.",{"type":10,"tag":33,"props":2971,"children":2972},{},[2973],{"type":15,"value":2974},"Individual video picture resources can be shared across different contexts, e.g. reference pictures can be shared between video decoding and encoding workloads, and the output of a video decode operation can be used as an input to a video encode operation.",{"type":10,"tag":33,"props":2976,"children":2977},{},[2978],{"type":15,"value":2979},"The images backing the video picture resources can also be used in other non-video-related operations, e.g. video decode operations may directly output to presentable swapchain images, or to images that can be subsequently sampled by graphics operations, subject to appropriate implementation capabilities.",{"type":10,"tag":33,"props":2981,"children":2982},{},[2983],{"type":15,"value":2984},"The application can also use sparse memory bindings for the images backing the video picture resources. The use of sparse memory bindings allows the application to unbind the device memory backing of the images when the corresponding DPB slot is not in active use.",{"type":10,"tag":11,"props":2986,"children":2987},{},[2988],{"type":15,"value":2989},"These general Vulkan capabilities enable this extension to provide seamless and efficient integration across different types of workloads in a \"zero-copy\" fashion and minimal synchronization overhead.",{"type":10,"tag":115,"props":2991,"children":2993},{"id":2992},"_resource_creation",[2994],{"type":15,"value":2995},"Resource Creation",{"type":10,"tag":11,"props":2997,"children":2998},{},[2999],{"type":15,"value":3000},"This extension stores video picture resources in image objects. As the device memory requirements of video picture resources may be specific to the video profile used, when creating images with any video-specific usage the application has to provide information about the video profiles the image will be used with. As a single image may be reused across video sessions using different video profiles (e.g. to use the decoded output picture as an input picture to subsequent encode operations), the following new structure is introduced to provide a list of video profiles:",{"type":10,"tag":143,"props":3002,"children":3004},{"className":145,"code":3003,"language":147,"meta":148,"style":148},"typedef struct VkVideoProfileListInfoKHR {\n    VkStructureType                 sType;\n    const void*                     pNext;\n    uint32_t                        profileCount;\n    const VkVideoProfileInfoKHR*    pProfiles;\n} VkVideoProfileListInfoKHR;\n",[3005],{"type":10,"tag":151,"props":3006,"children":3007},{"__ignoreMap":148},[3008,3024,3031,3046,3058,3078],{"type":10,"tag":155,"props":3009,"children":3010},{"class":157,"line":158},[3011,3015,3019],{"type":10,"tag":155,"props":3012,"children":3013},{"style":162},[3014],{"type":15,"value":165},{"type":10,"tag":155,"props":3016,"children":3017},{"style":162},[3018],{"type":15,"value":170},{"type":10,"tag":155,"props":3020,"children":3021},{"style":173},[3022],{"type":15,"value":3023}," VkVideoProfileListInfoKHR {\n",{"type":10,"tag":155,"props":3025,"children":3026},{"class":157,"line":179},[3027],{"type":10,"tag":155,"props":3028,"children":3029},{"style":173},[3030],{"type":15,"value":794},{"type":10,"tag":155,"props":3032,"children":3033},{"class":157,"line":188},[3034,3038,3042],{"type":10,"tag":155,"props":3035,"children":3036},{"style":162},[3037],{"type":15,"value":194},{"type":10,"tag":155,"props":3039,"children":3040},{"style":162},[3041],{"type":15,"value":199},{"type":10,"tag":155,"props":3043,"children":3044},{"style":173},[3045],{"type":15,"value":810},{"type":10,"tag":155,"props":3047,"children":3048},{"class":157,"line":207},[3049,3053],{"type":10,"tag":155,"props":3050,"children":3051},{"style":162},[3052],{"type":15,"value":451},{"type":10,"tag":155,"props":3054,"children":3055},{"style":173},[3056],{"type":15,"value":3057},"                        profileCount;\n",{"type":10,"tag":155,"props":3059,"children":3060},{"class":157,"line":216},[3061,3065,3069,3073],{"type":10,"tag":155,"props":3062,"children":3063},{"style":162},[3064],{"type":15,"value":194},{"type":10,"tag":155,"props":3066,"children":3067},{"style":173},[3068],{"type":15,"value":842},{"type":10,"tag":155,"props":3070,"children":3071},{"style":162},[3072],{"type":15,"value":702},{"type":10,"tag":155,"props":3074,"children":3075},{"style":173},[3076],{"type":15,"value":3077},"    pProfiles;\n",{"type":10,"tag":155,"props":3079,"children":3080},{"class":157,"line":225},[3081],{"type":10,"tag":155,"props":3082,"children":3083},{"style":173},[3084],{"type":15,"value":3085},"} VkVideoProfileListInfoKHR;\n",{"type":10,"tag":11,"props":3087,"children":3088},{},[3089],{"type":15,"value":3090},"As multiple profiles are expected to be specified only in video transcoding use cases, the list can include at most one video decode profile and one or more video encode profiles.",{"type":10,"tag":11,"props":3092,"children":3093},{},[3094,3096,3101,3103,3109,3111,3117],{"type":15,"value":3095},"When an instance of this structure is included in the ",{"type":10,"tag":151,"props":3097,"children":3099},{"className":3098},[],[3100],{"type":15,"value":260},{"type":15,"value":3102}," chain of ",{"type":10,"tag":151,"props":3104,"children":3106},{"className":3105},[],[3107],{"type":15,"value":3108},"VkImageCreateInfo",{"type":15,"value":3110}," to a ",{"type":10,"tag":151,"props":3112,"children":3114},{"className":3113},[],[3115],{"type":15,"value":3116},"vkCreateImage",{"type":15,"value":3118}," call, the created image will be usable in video coding operations recorded against video sessions using any of the specified video profiles.",{"type":10,"tag":11,"props":3120,"children":3121},{},[3122,3124,3129,3130,3136,3138,3144],{"type":15,"value":3123},"Similarly, buffers used as the backing store for video bitstreams have to be created with the ",{"type":10,"tag":151,"props":3125,"children":3127},{"className":3126},[],[3128],{"type":15,"value":260},{"type":15,"value":3102},{"type":10,"tag":151,"props":3131,"children":3133},{"className":3132},[],[3134],{"type":15,"value":3135},"VkBufferCreateInfo",{"type":15,"value":3137}," including a profile list structure when calling ",{"type":10,"tag":151,"props":3139,"children":3141},{"className":3140},[],[3142],{"type":15,"value":3143},"vkCreateBuffer",{"type":15,"value":3145}," in order to make the resulting buffer compatible with video sessions using any of the specified video profiles.",{"type":10,"tag":11,"props":3147,"children":3148},{},[3149,3151,3156,3158,3164,3166,3171,3172,3178,3180,3185,3187,3193],{"type":15,"value":3150},"Query pools are also video-profile-specific. In particular, in order to create a ",{"type":10,"tag":151,"props":3152,"children":3154},{"className":3153},[],[3155],{"type":15,"value":2698},{"type":15,"value":3157}," query pool compatible with a particular video profile, the application has to include an instance of the ",{"type":10,"tag":151,"props":3159,"children":3161},{"className":3160},[],[3162],{"type":15,"value":3163},"VkVideoProfileInfoKHR",{"type":15,"value":3165}," structure in the ",{"type":10,"tag":151,"props":3167,"children":3169},{"className":3168},[],[3170],{"type":15,"value":260},{"type":15,"value":3102},{"type":10,"tag":151,"props":3173,"children":3175},{"className":3174},[],[3176],{"type":15,"value":3177},"VkQueryPoolCreateInfo",{"type":15,"value":3179},". Unlike buffers and images, query pools are not reusable across video sessions using different video profiles, hence the used structure is ",{"type":10,"tag":151,"props":3181,"children":3183},{"className":3182},[],[3184],{"type":15,"value":3163},{"type":15,"value":3186}," instead of ",{"type":10,"tag":151,"props":3188,"children":3190},{"className":3189},[],[3191],{"type":15,"value":3192},"VkVideoProfileListInfoKHR",{"type":15,"value":3194},".",{"type":10,"tag":115,"props":3196,"children":3198},{"id":3197},"_protected_content_support",[3199],{"type":15,"value":3200},"Protected Content Support",{"type":10,"tag":11,"props":3202,"children":3203},{},[3204,3206,3212],{"type":15,"value":3205},"This extension also enables support of video coding operations using protected content. Whether a particular implementation supports coding protected content is indicated by the ",{"type":10,"tag":151,"props":3207,"children":3209},{"className":3208},[],[3210],{"type":15,"value":3211},"VK_VIDEO_CAPABILITY_PROTECTED_CONTENT_BIT_KHR",{"type":15,"value":3213}," capability flag.",{"type":10,"tag":11,"props":3215,"children":3216},{},[3217],{"type":15,"value":3218},"Just like in all other Vulkan operations using protected content, the resources participating in those must either all be protected or unprotected. This applies to the command buffer (and the command pool it is allocated from), to the queue the command buffer is submitted to, to the buffers and images used within those command buffers, as well as to the video session objects used for video coding.",{"type":10,"tag":11,"props":3220,"children":3221},{},[3222,3224,3229,3231,3237],{"type":15,"value":3223},"If the ",{"type":10,"tag":151,"props":3225,"children":3227},{"className":3226},[],[3228],{"type":15,"value":3211},{"type":15,"value":3230}," capability flag is supported, the application can create protected-capable video sessions using the ",{"type":10,"tag":151,"props":3232,"children":3234},{"className":3233},[],[3235],{"type":15,"value":3236},"VK_VIDEO_SESSION_CREATE_PROTECTED_CONTENT_BIT_KHR",{"type":15,"value":3238}," 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In addition, layered extensions will include additional capabilities specific to the type of video coding operation and video compression standard.",{"type":10,"tag":11,"props":3510,"children":3511},{},[3512],{"type":15,"value":3513},"The picture access granularity is something that the application has to particularly pay attention to. Video coding hardware can often access memory only at a particular granularity (block size) that may span multiple rows or columns of the picture data. This means that when a video coding operation writes data to a video picture resource it is possible that texels outside of the effective extents of the picture will also get modified. Writes to such padding texels will result in undefined texel values, thus the application has to make sure not to assume any particular values in these \"shoulder\" areas. This is especially important when the application chooses to reuse the same video picture resources to process video frames larger than the resource was previously used with. To avoid reading undefined values in such cases, applications should clear the image subresources used as video picture resources when the resolution of the video content changes, or otherwise ensure that these padding texels contain well-defined data (e.g. by writing to them) before being read from.",{"type":10,"tag":11,"props":3515,"children":3516},{},[3517],{"type":15,"value":3518},"Besides the global capabilities of a video profile, the set of image formats usable with video coding operations is also specific to each video profile. The following new query enables the application to enumerate the list and properties of the image formats supported by a given set of video profiles:",{"type":10,"tag":143,"props":3520,"children":3522},{"className":145,"code":3521,"language":147,"meta":148,"style":148},"VKAPI_ATTR VkResult VKAPI_CALL vkGetPhysicalDeviceVideoFormatPropertiesKHR(\n    VkPhysicalDevice                            physicalDevice,\n    const VkPhysicalDeviceVideoFormatInfoKHR*   pVideoFormatInfo,\n    uint32_t*                                   pVideoFormatPropertyCount,\n    VkVideoFormatPropertiesKHR*                 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