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Especially as the tiles may be spread across multiple tile group OBUs.",{"type":10,"tag":221,"props":5278,"children":5280},{"id":5279},"_resolved_does_the_application_also_need_to_specify_the_offset_of_the_frame_header_obu",[5281],{"type":15,"value":5282},"RESOLVED: Does the application also need to specify the offset of the frame header OBU?",{"type":10,"tag":11,"props":5284,"children":5285},{},[5286],{"type":15,"value":5287},"Due to the base address alignment requirements of the bitstream buffer, having the frame header OBU at offset zero within the application provided bitstream buffer range may require an additional copy on the application side which would be suboptimal. There are at least two possible options to avoid that:",{"type":10,"tag":101,"props":5289,"children":5290},{},[5291,5296],{"type":10,"tag":80,"props":5292,"children":5293},{},[5294],{"type":15,"value":5295},"Add a parameter to the AV1 decode picture information structure indicating the offset of the frame header OBU",{"type":10,"tag":80,"props":5297,"children":5298},{},[5299,5301,5307,5309,5314],{"type":15,"value":5300},"Require ",{"type":10,"tag":29,"props":5302,"children":5304},{"className":5303},[],[5305],{"type":15,"value":5306},"minBitstreamBufferOffsetAlignment",{"type":15,"value":5308}," to be ",{"type":10,"tag":29,"props":5310,"children":5312},{"className":5311},[],[5313],{"type":15,"value":3093},{"type":15,"value":5315}," for AV1 decode profiles",{"type":10,"tag":11,"props":5317,"children":5318},{},[5319],{"type":15,"value":5320},"This proposal follows option (1) and adds an explicit frame header OBU offset parameter for the application to be able to place bitstream data into the buffer at any offset typically dictated by the input content, while also allowing implementations to parse any data, if needed, from the frame header OBU.",{"type":10,"tag":11,"props":5322,"children":5323},{},[5324],{"type":15,"value":5325},"If the frame is split across multiple tile group OBUs, then multiple frame header OBUs may be present in the bitstream, but as those all have to match it is sufficient to specify the offset of either of them.",{"type":10,"tag":221,"props":5327,"children":5329},{"id":5328},"_resolved_does_the_application_also_need_to_specify_the_offsets_of_the_tile_group_obus_and_the_range_of_tiles_they_cover",[5330],{"type":15,"value":5331},"RESOLVED: Does the application also need to specify the offsets of the tile group OBUs and the range of tiles they cover?",{"type":10,"tag":11,"props":5333,"children":5334},{},[5335],{"type":15,"value":5336},"No. Implementations only need the offsets and sizes of individual tiles but do not care about the grouping of tiles into tile group OBUs.",{"type":10,"tag":221,"props":5338,"children":5340},{"id":5339},"_resolved_how_do_av1_references_map_to_dpb_slot_indices",[5341],{"type":15,"value":5342},"RESOLVED: How do AV1 references map to DPB slot indices?",{"type":10,"tag":11,"props":5344,"children":5345},{},[5346,5348,5354],{"type":15,"value":5347},"AV1 associates different semantics to the various types of references referred to by a frame (",{"type":10,"tag":29,"props":5349,"children":5351},{"className":5350},[],[5352],{"type":15,"value":5353},"INTRA_FRAME..ALTREF_FRAME",{"type":15,"value":5355},").",{"type":10,"tag":11,"props":5357,"children":5358},{},[5359,5361,5366,5368,5374],{"type":15,"value":5360},"The AV1 ",{"type":10,"tag":29,"props":5362,"children":5364},{"className":5363},[],[5365],{"type":15,"value":1204},{"type":15,"value":5367}," array provides a mapping table from the AV1 reference names ",{"type":10,"tag":29,"props":5369,"children":5371},{"className":5370},[],[5372],{"type":15,"value":5373},"LAST_FRAME..ALTREF_FRAME",{"type":15,"value":5375}," to reference picture slot numbers. These numbers are indices used to address various state vectors, and the so called VBI (virtual buffer index) that maps individual reference picture slots to reference picture resources (BufferPool entries).",{"type":10,"tag":11,"props":5377,"children":5378},{},[5379],{"type":15,"value":5380},"While conceptually the AV1 VBI is similar to the Vulkan DPB model, it has certain behaviors that render using the VBI directly as the Vulkan DPB impossible. In particular:",{"type":10,"tag":76,"props":5382,"children":5383},{},[5384,5397],{"type":10,"tag":80,"props":5385,"children":5386},{},[5387,5389,5395],{"type":15,"value":5388},"The reference frame update process described in section 7.20 of the AV1 specification allows the video stream to activate multiple VBI slots with the currently reconstructed picture through setting multiple bits in the ",{"type":10,"tag":29,"props":5390,"children":5392},{"className":5391},[],[5393],{"type":15,"value":5394},"refresh_frame_flags",{"type":15,"value":5396}," syntax element, but the Vulkan DPB model does not allow activating multiple DPB slots at once with the same video picture resource",{"type":10,"tag":80,"props":5398,"children":5399},{},[5400],{"type":15,"value":5401},"As a result, multiple slots of the AV1 VBI can refer to the same reference picture resource at any given time, which is also not allowed in the Vulkan DPB model",{"type":10,"tag":11,"props":5403,"children":5404},{},[5405],{"type":15,"value":5406},"Accordingly, the AV1 VBI cannot be used directly as the Vulkan DPB and, as such, the AV1 reference picture slots are not equivalent with the Vulkan DPB slot indices.",{"type":10,"tag":11,"props":5408,"children":5409},{},[5410],{"type":15,"value":5411},"This means that there is a need for some form of mapping from AV1 reference names to Vulkan DPB slot indices. The following options were considered to enable this:",{"type":10,"tag":101,"props":5413,"children":5414},{},[5415,5427,5432,5444],{"type":10,"tag":80,"props":5416,"children":5417},{},[5418,5420,5425],{"type":15,"value":5419},"Require the application to provide an already remapped form of the ",{"type":10,"tag":29,"props":5421,"children":5423},{"className":5422},[],[5424],{"type":15,"value":1204},{"type":15,"value":5426}," array (and any other codec-specific parameters that provide per AV1 reference name information) to the implementation where the AV1 reference picture slots (VBI slot indices) are already replaced with Vulkan DPB slot indices",{"type":10,"tag":80,"props":5428,"children":5429},{},[5430],{"type":15,"value":5431},"Require the application to provide a mapping table from AV1 reference picture slots (VBI slot indices) to Vulkan DPB slot indices",{"type":10,"tag":80,"props":5433,"children":5434},{},[5435,5437,5442],{"type":15,"value":5436},"Require the application to provide a mapping table from AV1 reference names (",{"type":10,"tag":29,"props":5438,"children":5440},{"className":5439},[],[5441],{"type":15,"value":5373},{"type":15,"value":5443},") to Vulkan DPB slot indices",{"type":10,"tag":80,"props":5445,"children":5446},{},[5447,5449,5454],{"type":15,"value":5448},"Require the application to specify the AV1 reference name (",{"type":10,"tag":29,"props":5450,"children":5452},{"className":5451},[],[5453],{"type":15,"value":5373},{"type":15,"value":5455},") as part of the set of Video Std reference picture information parameters",{"type":10,"tag":11,"props":5457,"children":5458},{},[5459,5461,5466],{"type":15,"value":5460},"Option (1) would avoid introducing any new parameters, but would make the semantics of the ",{"type":10,"tag":29,"props":5462,"children":5464},{"className":5463},[],[5465],{"type":15,"value":1204},{"type":15,"value":5467}," array (and all other codec-specific parameters that provide per AV1 reference name information) differ from the one defined in the AV1 specification, which could be awkward to describe and thus could be confusing for users of the API.",{"type":10,"tag":11,"props":5469,"children":5470},{},[5471],{"type":15,"value":5472},"In the model proposed by option (2), translation from AV1 reference names to Vulkan DPB slot indices would happen in two steps:",{"type":10,"tag":76,"props":5474,"children":5475},{},[5476,5495],{"type":10,"tag":80,"props":5477,"children":5478},{},[5479,5481,5486,5488,5493],{"type":15,"value":5480},"First, ",{"type":10,"tag":29,"props":5482,"children":5484},{"className":5483},[],[5485],{"type":15,"value":1204},{"type":15,"value":5487}," maps the AV1 reference name (",{"type":10,"tag":29,"props":5489,"children":5491},{"className":5490},[],[5492],{"type":15,"value":5373},{"type":15,"value":5494},") to AV1 picture resource slots (VBI indices)",{"type":10,"tag":80,"props":5496,"children":5497},{},[5498],{"type":15,"value":5499},"Second, a new VBI mapping table would map the AV1 picture resource slots (VBI indices) to Vulkan DPB slot indices",{"type":10,"tag":11,"props":5501,"children":5502},{},[5503],{"type":15,"value":5504},"Accordingly, option (2) would be fairly straightforward and mostly self-explanatory, but would require reintroducing the VBI concept defined in Annex E of the AV1 specification with the BufferPool resources being replaced by Vulkan DPB slots, and the translation itself would need to happen in two steps, per above.",{"type":10,"tag":11,"props":5506,"children":5507},{},[5508,5510,5515],{"type":15,"value":5509},"Option (3) is similar to option (2), but the new mapping table would instead map AV1 reference names (",{"type":10,"tag":29,"props":5511,"children":5513},{"className":5512},[],[5514],{"type":15,"value":5373},{"type":15,"value":5516},") directly to Vulkan DPB slot indices, which avoids the need to introduce the concept of VBI and the need for a two-step mapping.",{"type":10,"tag":11,"props":5518,"children":5519},{},[5520],{"type":15,"value":5521},"Such a mapping table seems pretty arbitrary. In addition, unlike the VBI based mapping table in option (2), most entries of this mapping table would be irrelevant to implementations, as decoding only needs to know the DPB slot indices corresponding to the AV1 reference names actually used by the active reference picture list for the currently decoded frame.",{"type":10,"tag":11,"props":5523,"children":5524},{},[5525,5527,5532],{"type":15,"value":5526},"Option (4) solves the shortcomings of option (3) by instead of providing a mapping from AV1 reference names (",{"type":10,"tag":29,"props":5528,"children":5530},{"className":5529},[],[5531],{"type":15,"value":5373},{"type":15,"value":5533},") to Vulkan DPB slot indices, it specifies the AV1 reference name for each active reference picture, and provides a mapping between Vulkan DPB slot indices and AV1 reference names through that. This is, however, not possible in practice, because there is not always a 1-to-1 mapping between AV1 reference names and DPB slot indices, as multiple AV1 reference names may map to the same DPB slot index.",{"type":10,"tag":11,"props":5535,"children":5536},{},[5537],{"type":15,"value":5538},"This proposal chooses option (3), because having a mapping directly from AV1 reference names to Vulkan DPB slot indices is sufficient.",{"type":10,"tag":221,"props":5540,"children":5542},{"id":5541},"_resolved_does_av1_decode_support_the_coincide_mode",[5543,5545,5551],{"type":15,"value":5544},"RESOLVED: Does AV1 decode support the ",{"type":10,"tag":5546,"props":5547,"children":5548},"em",{},[5549],{"type":15,"value":5550},"coincide",{"type":15,"value":5552}," mode?",{"type":10,"tag":11,"props":5554,"children":5555},{},[5556,5558,5562,5564,5569,5571,5575,5577,5581,5583,5587,5589,5593,5595,5599],{"type":15,"value":5557},"AV1 film grain is an example where the image contents of the decode output picture and the reconstructed picture will need to be different, thus in such cases using ",{"type":10,"tag":5546,"props":5559,"children":5560},{},[5561],{"type":15,"value":5550},{"type":15,"value":5563}," mode is not really an option. However, requiring ",{"type":10,"tag":5546,"props":5565,"children":5566},{},[5567],{"type":15,"value":5568},"distinct",{"type":15,"value":5570}," mode in all cases would be overly restrictive, as implementations may be able to support ",{"type":10,"tag":5546,"props":5572,"children":5573},{},[5574],{"type":15,"value":5550},{"type":15,"value":5576}," mode when film grain is not used, or if the frames using film grain may not need to be set up as reference, hence this proposal does not restrict implementations to support ",{"type":10,"tag":5546,"props":5578,"children":5579},{},[5580],{"type":15,"value":5550},{"type":15,"value":5582}," mode when applicable and only requires the use of ",{"type":10,"tag":5546,"props":5584,"children":5585},{},[5586],{"type":15,"value":5568},{"type":15,"value":5588}," mode in the specific decode operations that do apply film grain. In fact, this proposal changes general codec-independent behavior by allowing ",{"type":10,"tag":5546,"props":5590,"children":5591},{},[5592],{"type":15,"value":5568},{"type":15,"value":5594}," mode to be used for AV1 film grain enabled frames (by specifying a different decode output and reconstructed picture resource) even if the implementation does not report support for ",{"type":10,"tag":5546,"props":5596,"children":5597},{},[5598],{"type":15,"value":5568},{"type":15,"value":5600}," mode in the video decode profile capabilities.",{"type":10,"tag":221,"props":5602,"children":5604},{"id":5603},"_resolved_should_film_grain_be_a_capability_or_part_of_the_video_profile_definition",[5605],{"type":15,"value":5606},"RESOLVED: Should film grain be a capability or part of the video profile definition?",{"type":10,"tag":11,"props":5608,"children":5609},{},[5610],{"type":15,"value":5611},"As AV1 film grain may have implications on the overall behavior of the decoding process, this proposal includes it in the video profile definition similar to how the picture layout for interlaced content is also part of the video profile definition for H.264 decode.",{"type":10,"tag":11,"props":5613,"children":5614},{},[5615],{"type":15,"value":5616},"Whether the application intends to use film grain or not may affect the memory requirements of video sessions and/or video picture resources, thus including film grain support in the video profile definition enables implementations to minimize the memory needs of decoding when film grain is not expected to be used.",{"type":10,"tag":11,"props":5618,"children":5619},{},[5620],{"type":15,"value":5621},"It is understood that not all applications may know in advance whether the decoded bitstream will use film grain or not. In such cases applications have at least the following options:",{"type":10,"tag":101,"props":5623,"children":5624},{},[5625,5630],{"type":10,"tag":80,"props":5626,"children":5627},{},[5628],{"type":15,"value":5629},"Conservatively enable film grain support in the video profile",{"type":10,"tag":80,"props":5631,"children":5632},{},[5633],{"type":15,"value":5634},"Use other methods to apply film grain onto the decode output picture (e.g. using shaders)",{"type":10,"tag":11,"props":5636,"children":5637},{},[5638],{"type":15,"value":5639},"Option (2) may anyway be necessary to support implementations that do not support AV1 decode profiles with film grain support.",{"type":10,"tag":221,"props":5641,"children":5643},{"id":5642},"_resolved_do_the_additional_memory_requirements_imposed_by_av1_film_grain_support_affect_the_memory_requirements_of_images_created_with_vk_image_create_video_profile_independent_bit_khr",[5644,5646,5652],{"type":15,"value":5645},"RESOLVED: Do the additional memory requirements imposed by AV1 film grain support affect the memory requirements of images created with ",{"type":10,"tag":29,"props":5647,"children":5649},{"className":5648},[],[5650],{"type":15,"value":5651},"VK_IMAGE_CREATE_VIDEO_PROFILE_INDEPENDENT_BIT_KHR",{"type":15,"value":5653},"?",{"type":10,"tag":11,"props":5655,"children":5656},{},[5657,5659,5665],{"type":15,"value":5658},"Potentially. Video profile independent image resources need to be compatible with all video profiles supported by the implementation, thus if the implementation has additional memory requirements for such resources (e.g. an image usable both as decode output picture and reconstructed picture) in order to support AV1 film grain, then those may apply to certain video profile independent image resources, in line with the general expectations laid out about video profile independent resources in the ",{"type":10,"tag":29,"props":5660,"children":5662},{"className":5661},[],[5663],{"type":15,"value":5664},"VK_KHR_video_maintenance1",{"type":15,"value":5666}," extension.",{"type":10,"tag":221,"props":5668,"children":5670},{"id":5669},"_resolved_does_the_application_has_to_send_frame_obus_that_have_show_existing_frame_set_for_decoding",[5671,5673,5679],{"type":15,"value":5672},"RESOLVED: Does the application has to send frame OBUs that have ",{"type":10,"tag":29,"props":5674,"children":5676},{"className":5675},[],[5677],{"type":15,"value":5678},"show_existing_frame",{"type":15,"value":5680}," set for decoding?",{"type":10,"tag":11,"props":5682,"children":5683},{},[5684],{"type":15,"value":5685},"No. Such frame OBUs do not contain any actual payload that is relevant to implementations.",{"type":10,"tag":221,"props":5687,"children":5689},{"id":5688},"_resolved_are_any_of_the_frame_width_minus_1_frame_height_minus_1_render_width_minus_1_and_render_height_minus_1_parameters_from_the_frame_header_redundant_with_respect_to_the_decoded_frame_size_specified_in_vkvideodecodeinfokhrdstpictureresource_codedextent",[5690,5692,5698,5699,5705,5706,5712,5713,5719,5721,5727],{"type":15,"value":5691},"RESOLVED: Are any of the ",{"type":10,"tag":29,"props":5693,"children":5695},{"className":5694},[],[5696],{"type":15,"value":5697},"frame_width_minus_1",{"type":15,"value":1109},{"type":10,"tag":29,"props":5700,"children":5702},{"className":5701},[],[5703],{"type":15,"value":5704},"frame_height_minus_1",{"type":15,"value":1109},{"type":10,"tag":29,"props":5707,"children":5709},{"className":5708},[],[5710],{"type":15,"value":5711},"render_width_minus_1",{"type":15,"value":1145},{"type":10,"tag":29,"props":5714,"children":5716},{"className":5715},[],[5717],{"type":15,"value":5718},"render_height_minus_1",{"type":15,"value":5720}," parameters from the frame header redundant with respect to the decoded frame size specified in ",{"type":10,"tag":29,"props":5722,"children":5724},{"className":5723},[],[5725],{"type":15,"value":5726},"VkVideoDecodeInfoKHR::dstPictureResource.codedExtent",{"type":15,"value":5653},{"type":10,"tag":11,"props":5729,"children":5730},{},[5731,5733,5739],{"type":15,"value":5732},"Yes. None of those parameters are necessary for decoding, as the ",{"type":10,"tag":29,"props":5734,"children":5736},{"className":5735},[],[5737],{"type":15,"value":5738},"codedExtent",{"type":15,"value":5740}," of the decode output picture provides sufficient information to implementations.",{"type":10,"tag":221,"props":5742,"children":5744},{"id":5743},"_resolved_are_the_extents_in_superblocks_specified_by_the_width_in_sbs_minus_1_and_height_in_sbs_minus_1_tile_parameters_necessary",[5745,5747,5753,5754,5760],{"type":15,"value":5746},"RESOLVED: Are the extents in superblocks specified by the ",{"type":10,"tag":29,"props":5748,"children":5750},{"className":5749},[],[5751],{"type":15,"value":5752},"width_in_sbs_minus_1",{"type":15,"value":67},{"type":10,"tag":29,"props":5755,"children":5757},{"className":5756},[],[5758],{"type":15,"value":5759},"height_in_sbs_minus_1",{"type":15,"value":5761}," tile parameters necessary?",{"type":10,"tag":11,"props":5763,"children":5764},{},[5765,5767,5773,5774,5780,5782,5788],{"type":15,"value":5766},"Yes. Video APIs use different conventions for these parameters. This proposal expects the syntax values specified through the ",{"type":10,"tag":29,"props":5768,"children":5770},{"className":5769},[],[5771],{"type":15,"value":5772},"pWidthInSbsMinus1",{"type":15,"value":67},{"type":10,"tag":29,"props":5775,"children":5777},{"className":5776},[],[5778],{"type":15,"value":5779},"pHeightInSbsMinus1",{"type":15,"value":5781}," array pointer members of the ",{"type":10,"tag":29,"props":5783,"children":5785},{"className":5784},[],[5786],{"type":15,"value":5787},"StdVideoAV1TileInfo",{"type":15,"value":5789}," structure.",{"type":10,"tag":221,"props":5791,"children":5793},{"id":5792},"_resolved_what_codec_specific_parameters_need_to_be_specified_for_the_active_reference_pictures",[5794],{"type":15,"value":5795},"RESOLVED: What codec-specific parameters need to be specified for the active reference pictures?",{"type":10,"tag":11,"props":5797,"children":5798},{},[5799],{"type":15,"value":5800},"Certain frame header OBU parameters of the referenced frames and a subset of the reference frame state tracked according to section 7.20 of the AV1 specification. These are needed by implementations that may not track them as part of the video session state.",{"type":10,"tag":221,"props":5802,"children":5804},{"id":5803},"_resolved_how_is_reference_picture_setup_requested_for_av1_decode_operations",[5805],{"type":15,"value":5806},"RESOLVED: How is reference picture setup requested for AV1 decode operations?",{"type":10,"tag":11,"props":5808,"children":5809},{},[5810],{"type":15,"value":5811},"As specifying a reconstructed picture DPB slot and resource is always required per the latest revision of the video extensions, additional codec syntax controls whether the DPB slot is activated with the reconstructed picture.",{"type":10,"tag":11,"props":5813,"children":5814},{},[5815,5817,5823,5825,5830,5832,5837],{"type":15,"value":5816},"In the case of AV1 decode, reference picture setup depends on the value of ",{"type":10,"tag":29,"props":5818,"children":5820},{"className":5819},[],[5821],{"type":15,"value":5822},"StdVideoDecodeAV1PictureInfo::refresh_frame_flags",{"type":15,"value":5824},". A non-zero ",{"type":10,"tag":29,"props":5826,"children":5828},{"className":5827},[],[5829],{"type":15,"value":5394},{"type":15,"value":5831}," indicates that the VBI needs to be updated such as for each set bit the corresponding VBI slot is associated with the decoded picture’s information, such as CDF data among others. 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