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",{"type":1873,"tag":1892,"props":2490,"children":2492},{"className":2491},[],[2493],{"type":1878,"value":2015},{"type":1878,"value":2495}," video std header (including the VP9 frame header parameters).",{"type":1873,"tag":1874,"props":2497,"children":2498},{},[2499,2500,2506,2508,2514,2516,2522,2524,2530],{"type":1878,"value":1890},{"type":1873,"tag":1892,"props":2501,"children":2503},{"className":2502},[],[2504],{"type":1878,"value":2505},"referenceNameSlotIndices",{"type":1878,"value":2507}," array provides a mapping from VP9 reference names to the DPB slot indices currently associated with the used reference picture resources. Multiple VP9 reference names may refer to the same DPB slot, while unused VP9 reference names are indicated by specifying a negative DPB slot index in the corresponding element of the array. As this array only provides a mapping for reference pictures used for inter-frame coding, for a given VP9 reference name ",{"type":1873,"tag":1892,"props":2509,"children":2511},{"className":2510},[],[2512],{"type":1878,"value":2513},"frame",{"type":1878,"value":2515}," (as defined in the enumeration type ",{"type":1873,"tag":1892,"props":2517,"children":2519},{"className":2518},[],[2520],{"type":1878,"value":2521},"StdVideoVP9ReferenceName",{"type":1878,"value":2523},") the corresponding DPB slot index is specified in ",{"type":1873,"tag":1892,"props":2525,"children":2527},{"className":2526},[],[2528],{"type":1878,"value":2529},"referenceNameSlotIndices[frame - STD_VIDEO_VP9_REFERENCE_NAME_LAST_FRAME]",{"type":1878,"value":2531},". 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Accordingly, there is no ",{"type":1873,"tag":1892,"props":2565,"children":2567},{"className":2566},[],[2568],{"type":1878,"value":2569},"VkVideoDecodeVP9DpbSlotInfoKHR",{"type":1878,"value":2571}," structure defined to enable specifying those for the active reference pictures and the optional reconstructed picture.",{"type":1873,"tag":1874,"props":2573,"children":2574},{},[2575],{"type":1878,"value":2576},"It is the application’s responsibility to specify video bitstream buffer data and codec-specific parameters that are compliant with the rules defined by the VP9 video compression standard. While it is not illegal, from the API usage’s point of view, to specify non-compliant inputs, they may cause the video decode operation to complete unsuccessfully and will cause the output pictures (decode output and reconstructed pictures) to have undefined contents after the execution of the operation.",{"type":1873,"tag":1874,"props":2578,"children":2579},{},[2580,2582,2591],{"type":1878,"value":2581},"For more information about how to parse individual VP9 bitstream syntax elements, calculate derived values, and, in general, how to interpret these parameters, please refer to the corresponding sections of the ",{"type":1873,"tag":2583,"props":2584,"children":2588},"a",{"href":2585,"rel":2586},"https://storage.googleapis.com/downloads.webmproject.org/docs/vp9/vp9-bitstream-specification-v0.7-20170222-draft.pdf",[2587],"nofollow",[2589],{"type":1878,"value":2590},"VP9 Specification",{"type":1878,"value":2114},{"type":1873,"tag":2070,"props":2593,"children":2595},{"id":2594},"_vp9_reference_management",[2596],{"type":1878,"value":2597},"VP9 Reference Management",{"type":1873,"tag":1874,"props":2599,"children":2600},{},[2601,2603,2609,2610,2616,2617,2623,2625,2631],{"type":1878,"value":2602},"The VP9 video compression standard supports each frame to reference up to 3 + 1 reference pictures for sample prediction. The three \"real\" reference pictures are identified with so called VP9 reference names (",{"type":1873,"tag":1892,"props":2604,"children":2606},{"className":2605},[],[2607],{"type":1878,"value":2608},"LAST_FRAME",{"type":1878,"value":2542},{"type":1873,"tag":1892,"props":2611,"children":2613},{"className":2612},[],[2614],{"type":1878,"value":2615},"GOLDEN_FRAME",{"type":1878,"value":2550},{"type":1873,"tag":1892,"props":2618,"children":2620},{"className":2619},[],[2621],{"type":1878,"value":2622},"ALTREF_FRAME",{"type":1878,"value":2624},") identifying different types of forward and backward references. Each VP9 reference name has associated semantics that affect how the reference picture data is used for inter-frame sample prediction. 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