[{"data":1,"prerenderedAt":5109},["ShallowReactive",2],{"0Z1ictEdUD":3,"VyF3Mmj32r":3481,"N9m89Rcq0G":3664},{"title":4,"description":5,"body":6,"_type":3480,"_id":4},"VK_KHR_video_encode_quantization_map.proposal","This document outlines a proposal that enables fine grained control of codec-specific quantization parameters in video encode operations.",{"type":7,"children":8,"toc":3446},"root",[9,16,23,28,43,48,54,59,72,77,82,96,101,106,124,129,134,147,153,160,174,199,204,209,223,235,240,254,265,271,276,301,314,327,333,338,363,374,380,455,466,484,490,509,522,579,590,603,609,614,621,626,639,668,743,749,754,766,789,864,904,961,981,999,1009,1015,1020,1033,1057,1130,1167,1226,1245,1262,1272,1278,1283,1308,1313,1339,1402,1407,1419,1444,1463,1532,1538,1544,2304,2310,3204,3210,3216,3221,3227,3232,3250,3255,3260,3266,3271,3277,3282,3287,3292,3298,3303,3321,3326,3331,3343,3357,3362,3368,3373,3379,3384,3390,3395,3401,3406,3419,3424,3435,3440],{"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},"Currently, the video encode extensions support the following application control over the codec-specific quantization parameters used by encoder implementations:",{"type":10,"tag":29,"props":30,"children":31},"ol",{},[32,38],{"type":10,"tag":33,"props":34,"children":35},"li",{},[36],{"type":15,"value":37},"Specifying explicit quantization parameters for individual codec-specific picture subregions when rate control is disabled (e.g. in case of H.264 encode, specifying a constant QP value to use for each slice)",{"type":10,"tag":33,"props":39,"children":40},{},[41],{"type":15,"value":42},"Specifying the range of quantization parameters the implementation can use when rate control is enabled (e.g. in case of H.264 encode, specifying minimum and maximum QP values to use for each picture type)",{"type":10,"tag":11,"props":44,"children":45},{},[46],{"type":15,"value":47},"However, it is common for applications to need finer control over the selection of quantization parameters to improve the quality in specific regions of the pictures or to better control the distribution of bitstream budget between high-frequency and low-frequency picture regions.",{"type":10,"tag":17,"props":49,"children":51},{"id":50},"_solution_space",[52],{"type":15,"value":53},"Solution Space",{"type":10,"tag":11,"props":55,"children":56},{},[57],{"type":15,"value":58},"The following new controls have been considered for inclusion in this proposal:",{"type":10,"tag":29,"props":60,"children":61},{},[62,67],{"type":10,"tag":33,"props":63,"children":64},{},[65],{"type":15,"value":66},"Enable specifying explicit quantization parameters for individual regions of the encoded picture at a finer granularity when rate control is disabled",{"type":10,"tag":33,"props":68,"children":69},{},[70],{"type":15,"value":71},"Enable specifying quantization adjustment values for individual regions of the encoded picture when rate control is enabled",{"type":10,"tag":11,"props":73,"children":74},{},[75],{"type":15,"value":76},"As there are implementations that support all of these controls, it is desired to enable support for all of them.",{"type":10,"tag":11,"props":78,"children":79},{},[80],{"type":15,"value":81},"The following options have been considered to express the mapping of application-specified quantization adjustment parameters to individual regions of the encoded picture for (1) and (2):",{"type":10,"tag":83,"props":84,"children":85},"ul",{},[86,91],{"type":10,"tag":33,"props":87,"children":88},{},[89],{"type":15,"value":90},"Use a quantization map (2D grid of quantization adjustment parameters) that control the quantization parameters for individual grid-aligned rectangular blocks of the encoded picture (e.g. on a per coding block basis)",{"type":10,"tag":33,"props":92,"children":93},{},[94],{"type":15,"value":95},"Specify a list of (overlapping or non-overlapping) rectangular regions and corresponding quantization adjustment parameters to use",{"type":10,"tag":11,"props":97,"children":98},{},[99],{"type":15,"value":100},"Support for quantization maps is common, but implementations supporting quantization rectangle lists are not. While specifying quantization adjustment parameters for list of rectangles can typically be implemented in terms of quantization maps, this proposal does not include support for them in order to limit the scope of this proposal and to avoid encoders having to implement them through emulation.",{"type":10,"tag":11,"props":102,"children":103},{},[104],{"type":15,"value":105},"When it comes to the form in which quantization adjustment parameters are specified, the following options have been considered:",{"type":10,"tag":83,"props":107,"children":108},{},[109,114,119],{"type":10,"tag":33,"props":110,"children":111},{},[112],{"type":15,"value":113},"Specify absolute quantization parameter values (e.g. in case of H.264 encode, specify a map of absolute QP values to use for individual regions)",{"type":10,"tag":33,"props":115,"children":116},{},[117],{"type":15,"value":118},"Specify relative quantization parameter values (e.g. in case of H.264 encode, specify a map of QP delta values to add/subtract from the QP values that would otherwise be used according to the current rate control configuration)",{"type":10,"tag":33,"props":120,"children":121},{},[122],{"type":15,"value":123},"Specify relative \"emphasis\" values that indirectly control the relative quantization parameter values chosen by the implementation, indicating the \"importance\" of individual regions",{"type":10,"tag":11,"props":125,"children":126},{},[127],{"type":15,"value":128},"Specifying absolute quantization parameter values only makes sense when rate control is disabled. However, as existing APIs already provide controls to set the absolute value of quantization parameters at various codec-specific granularities, supporting absolute quantization maps seems unnecessary, as the same effect can be achieved by combining existing absolute quantization parameter controls with a quantization delta map (e.g. in case of H.264 encode, per-slice constant QP can be combined with a QP delta map to achieve the same effect as an absolute QP map could provide).",{"type":10,"tag":11,"props":130,"children":131},{},[132],{"type":15,"value":133},"Accordingly, this proposal suggests to introduce the following new controls:",{"type":10,"tag":29,"props":135,"children":136},{},[137,142],{"type":10,"tag":33,"props":138,"children":139},{},[140],{"type":15,"value":141},"The ability to specify quantization delta maps to directly control the relative quantization parameter values on a per-block basis for all rate control modes (including when rate control is disabled)",{"type":10,"tag":33,"props":143,"children":144},{},[145],{"type":15,"value":146},"The ability to specify \"emphasis\" maps to indirectly control the relative quantization parameter values on a per-block basis when rate control is enabled",{"type":10,"tag":17,"props":148,"children":150},{"id":149},"_proposal",[151],{"type":15,"value":152},"Proposal",{"type":10,"tag":154,"props":155,"children":157},"h3",{"id":156},"_new_video_profile_capabilities",[158],{"type":15,"value":159},"New Video Profile Capabilities",{"type":10,"tag":11,"props":161,"children":162},{},[163,165,172],{"type":15,"value":164},"The new capabilities of this proposal are exposed through video encode profile capability flags in ",{"type":10,"tag":166,"props":167,"children":169},"code",{"className":168},[],[170],{"type":15,"value":171},"VkVideoEncodeCapabilitiesKHR::flags",{"type":15,"value":173},":",{"type":10,"tag":83,"props":175,"children":176},{},[177,188],{"type":10,"tag":33,"props":178,"children":179},{},[180,186],{"type":10,"tag":166,"props":181,"children":183},{"className":182},[],[184],{"type":15,"value":185},"VK_VIDEO_ENCODE_CAPABILITY_QUANTIZATION_DELTA_MAP_BIT_KHR",{"type":15,"value":187}," indicates support for quantization delta maps (e.g. in case of H.264 encode, support for QP delta maps)",{"type":10,"tag":33,"props":189,"children":190},{},[191,197],{"type":10,"tag":166,"props":192,"children":194},{"className":193},[],[195],{"type":15,"value":196},"VK_VIDEO_ENCODE_CAPABILITY_EMPHASIS_MAP_BIT_KHR",{"type":15,"value":198}," indicates support for emphasis maps",{"type":10,"tag":11,"props":200,"children":201},{},[202],{"type":15,"value":203},"These video encode capability flags can only be exposed for video encode profiles targeting video codecs for which the extension defines the codec-specific behavior.",{"type":10,"tag":11,"props":205,"children":206},{},[207],{"type":15,"value":208},"The following additional H.264 encode profile capability is introduced:",{"type":10,"tag":83,"props":210,"children":211},{},[212],{"type":10,"tag":33,"props":213,"children":214},{},[215,221],{"type":10,"tag":166,"props":216,"children":218},{"className":217},[],[219],{"type":15,"value":220},"VK_VIDEO_ENCODE_H264_CAPABILITY_MB_QP_DIFF_WRAPAROUND_BIT_KHR",{"type":15,"value":222}," indicates support for wraparound during the calculation of the QP values of subsequent macroblocks",{"type":10,"tag":11,"props":224,"children":225},{},[226,228,233],{"type":15,"value":227},"If the implementation does not support ",{"type":10,"tag":166,"props":229,"children":231},{"className":230},[],[232],{"type":15,"value":220},{"type":15,"value":234}," then the maximum QP difference across subsequent macroblocks is limited to the [-(26 + QpBdOffsetY / 2), 25 + QpBdOffsetY / 2] range.",{"type":10,"tag":11,"props":236,"children":237},{},[238],{"type":15,"value":239},"Similarly, the following additional H.265 encode profile capability is introduced:",{"type":10,"tag":83,"props":241,"children":242},{},[243],{"type":10,"tag":33,"props":244,"children":245},{},[246,252],{"type":10,"tag":166,"props":247,"children":249},{"className":248},[],[250],{"type":15,"value":251},"VK_VIDEO_ENCODE_H265_CAPABILITY_CU_QP_DIFF_WRAPAROUND_BIT_KHR",{"type":15,"value":253}," indicates support for wraparound during the calculation of the QP values of subsequent coding units",{"type":10,"tag":11,"props":255,"children":256},{},[257,258,263],{"type":15,"value":227},{"type":10,"tag":166,"props":259,"children":261},{"className":260},[],[262],{"type":15,"value":251},{"type":15,"value":264}," then the maximum QP difference across subsequent coding units is limited to the [-(26 + QpBdOffsetY / 2), 25 + QpBdOffsetY / 2] range.",{"type":10,"tag":154,"props":266,"children":268},{"id":267},"_new_image_usage_flags",[269],{"type":15,"value":270},"New Image Usage Flags",{"type":10,"tag":11,"props":272,"children":273},{},[274],{"type":15,"value":275},"Quantization delta maps and emphasis maps are represented by image objects. Accordingly, this proposal introduces the following new image usage flags:",{"type":10,"tag":83,"props":277,"children":278},{},[279,290],{"type":10,"tag":33,"props":280,"children":281},{},[282,288],{"type":10,"tag":166,"props":283,"children":285},{"className":284},[],[286],{"type":15,"value":287},"VK_IMAGE_USAGE_VIDEO_ENCODE_QUANTIZATION_DELTA_MAP_BIT_KHR",{"type":15,"value":289}," to request quantization delta map usage",{"type":10,"tag":33,"props":291,"children":292},{},[293,299],{"type":10,"tag":166,"props":294,"children":296},{"className":295},[],[297],{"type":15,"value":298},"VK_IMAGE_USAGE_VIDEO_ENCODE_EMPHASIS_MAP_BIT_KHR",{"type":15,"value":300}," to request emphasis map usage",{"type":10,"tag":11,"props":302,"children":303},{},[304,306,312],{"type":15,"value":305},"Just like in case of other video-specific image usages, support for these flags and their use in combination with other image parameters depends on the used video profile and thus the set of supported image formats and other creation parameters for them can be enumerated using the ",{"type":10,"tag":166,"props":307,"children":309},{"className":308},[],[310],{"type":15,"value":311},"vkGetPhysicalDeviceVideoFormatPropertiesKHR",{"type":15,"value":313}," command, as discussed later.",{"type":10,"tag":11,"props":315,"children":316},{},[317,319,325],{"type":15,"value":318},"This proposal also introduces a new optimal image layout to use with quantization maps called ",{"type":10,"tag":166,"props":320,"children":322},{"className":321},[],[323],{"type":15,"value":324},"VK_IMAGE_LAYOUT_VIDEO_ENCODE_QUANTIZATION_MAP_KHR",{"type":15,"value":326},".",{"type":10,"tag":154,"props":328,"children":330},{"id":329},"_new_format_feature_flags",[331],{"type":15,"value":332},"New Format Feature Flags",{"type":10,"tag":11,"props":334,"children":335},{},[336],{"type":15,"value":337},"To indicate which formats are compatible with the new video encode usage flags, the following new format feature flags are introduced:",{"type":10,"tag":83,"props":339,"children":340},{},[341,352],{"type":10,"tag":33,"props":342,"children":343},{},[344,350],{"type":10,"tag":166,"props":345,"children":347},{"className":346},[],[348],{"type":15,"value":349},"VK_FORMAT_FEATURE_2_VIDEO_ENCODE_QUANTIZATION_DELTA_MAP_BIT_KHR",{"type":15,"value":351}," indicates support for quantization delta map usage",{"type":10,"tag":33,"props":353,"children":354},{},[355,361],{"type":10,"tag":166,"props":356,"children":358},{"className":357},[],[359],{"type":15,"value":360},"VK_FORMAT_FEATURE_2_VIDEO_ENCODE_EMPHASIS_MAP_BIT_KHR",{"type":15,"value":362}," indicates support for emphasis map usage",{"type":10,"tag":11,"props":364,"children":365},{},[366,368,373],{"type":15,"value":367},"Just like in case of other video-specific format features, the presence of the format flags alone, as returned by the various format queries, is not sufficient to indicate that an image with that format is usable with video encoding using any particular video encode profile. Actual compatibility with a specific video encode profile has to be verified using the ",{"type":10,"tag":166,"props":369,"children":371},{"className":370},[],[372],{"type":15,"value":311},{"type":15,"value":313},{"type":10,"tag":154,"props":375,"children":377},{"id":376},"_quantization_map_capabilities",[378],{"type":15,"value":379},"Quantization Map Capabilities",{"type":10,"tag":381,"props":382,"children":387},"pre",{"className":383,"code":384,"language":385,"meta":386,"style":386},"language-c shiki shiki-themes github-light-default github-dark-default","typedef struct VkVideoEncodeQuantizationMapCapabilitiesKHR {\n VkStructureType sType;\n void* pNext;\n VkExtent2D maxQuantizationMapExtent;\n} VkVideoEncodeQuantizationMapCapabilitiesKHR;\n","c","",[388],{"type":10,"tag":166,"props":389,"children":390},{"__ignoreMap":386},[391,414,423,437,446],{"type":10,"tag":392,"props":393,"children":396},"span",{"class":394,"line":395},"line",1,[397,403,408],{"type":10,"tag":392,"props":398,"children":400},{"style":399},"--shiki-default:#CF222E;--shiki-dark:#FF7B72",[401],{"type":15,"value":402},"typedef",{"type":10,"tag":392,"props":404,"children":405},{"style":399},[406],{"type":15,"value":407}," struct",{"type":10,"tag":392,"props":409,"children":411},{"style":410},"--shiki-default:#1F2328;--shiki-dark:#E6EDF3",[412],{"type":15,"value":413}," VkVideoEncodeQuantizationMapCapabilitiesKHR {\n",{"type":10,"tag":392,"props":415,"children":417},{"class":394,"line":416},2,[418],{"type":10,"tag":392,"props":419,"children":420},{"style":410},[421],{"type":15,"value":422}," VkStructureType 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map images.",{"type":10,"tag":11,"props":467,"children":468},{},[469,471,476,478,483],{"type":15,"value":470},"Quantization maps have additional restrictions compared to other Vulkan images: they have to be 2D, single sampled images with no mip levels, and they are limited to the maximum extent indicated by ",{"type":10,"tag":166,"props":472,"children":474},{"className":473},[],[475],{"type":15,"value":463},{"type":15,"value":477}," as well as any video coding specific format restrictions, as returned by a corresponding call to ",{"type":10,"tag":166,"props":479,"children":481},{"className":480},[],[482],{"type":15,"value":311},{"type":15,"value":326},{"type":10,"tag":154,"props":485,"children":487},{"id":486},"_querying_quantization_map_formats",[488],{"type":15,"value":489},"Querying Quantization Map Formats",{"type":10,"tag":11,"props":491,"children":492},{},[493,495,501,503,508],{"type":15,"value":494},"As with all other video coding image usage flags, applications can query the list of supported formats for quantization delta maps and emphasis maps by specifying the corresponding image usage flag in the ",{"type":10,"tag":166,"props":496,"children":498},{"className":497},[],[499],{"type":15,"value":500},"VkPhysicalDeviceVideoFormatInfoKHR",{"type":15,"value":502}," structure passed to ",{"type":10,"tag":166,"props":504,"children":506},{"className":505},[],[507],{"type":15,"value":311},{"type":15,"value":326},{"type":10,"tag":11,"props":510,"children":511},{},[512,514,520],{"type":15,"value":513},"In addition to the common video format properties returned in ",{"type":10,"tag":166,"props":515,"children":517},{"className":516},[],[518],{"type":15,"value":519},"VkVideoFormatPropertiesKHR",{"type":15,"value":521},", the following additional properties are returned for quantization maps:",{"type":10,"tag":381,"props":523,"children":525},{"className":383,"code":524,"language":385,"meta":386,"style":386},"typedef struct VkVideoFormatQuantizationMapPropertiesKHR {\n VkStructureType sType;\n void* pNext;\n VkExtent2D quantizationMapTexelSize;\n} VkVideoFormatQuantizationMapPropertiesKHR;\n",[526],{"type":10,"tag":166,"props":527,"children":528},{"__ignoreMap":386},[529,545,552,563,571],{"type":10,"tag":392,"props":530,"children":531},{"class":394,"line":395},[532,536,540],{"type":10,"tag":392,"props":533,"children":534},{"style":399},[535],{"type":15,"value":402},{"type":10,"tag":392,"props":537,"children":538},{"style":399},[539],{"type":15,"value":407},{"type":10,"tag":392,"props":541,"children":542},{"style":410},[543],{"type":15,"value":544}," VkVideoFormatQuantizationMapPropertiesKHR 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VkVideoFormatQuantizationMapPropertiesKHR;\n",{"type":10,"tag":11,"props":580,"children":581},{},[582,588],{"type":10,"tag":166,"props":583,"children":585},{"className":584},[],[586],{"type":15,"value":587},"quantizationMapTexelSize",{"type":15,"value":589}," is the size of the block of encode picture texels corresponding to each texel in the quantization map (i.e. the granularity).",{"type":10,"tag":11,"props":591,"children":592},{},[593,595,601],{"type":15,"value":594},"Emphasis maps always have single channel unsigned normalized integer format and ",{"type":10,"tag":166,"props":596,"children":598},{"className":597},[],[599],{"type":15,"value":600},"VK_FORMAT_R8_UNORM",{"type":15,"value":602}," is always supported, while quantization delta map formats are codec-specific in nature.",{"type":10,"tag":154,"props":604,"children":606},{"id":605},"_codec_specific_details",[607],{"type":15,"value":608},"Codec-Specific 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The final QP value used to encode individual H.264 macroblocks is calculated by applying the QP delta map value corresponding to the macroblock as follows:",{"type":10,"tag":83,"props":627,"children":628},{},[629,634],{"type":10,"tag":33,"props":630,"children":631},{},[632],{"type":15,"value":633},"If rate control is disabled, the final QP value is the sum of the QP delta map value and the constant QP value specified for the slice in question",{"type":10,"tag":33,"props":635,"children":636},{},[637],{"type":15,"value":638},"If rate control is enabled, the QP value is the sum of the QP delta map value and the QP value determined by rate control, and the final QP value is clamped to the range of QP values allowed based on the profile capabilities and the configured rate control settings",{"type":10,"tag":11,"props":640,"children":641},{},[642,644,650,652,658,660,666],{"type":15,"value":643},"The allowed range of values that can be used in the texels of the QP delta map can be retrieved by including the following new structure in the ",{"type":10,"tag":166,"props":645,"children":647},{"className":646},[],[648],{"type":15,"value":649},"pNext",{"type":15,"value":651}," chain of ",{"type":10,"tag":166,"props":653,"children":655},{"className":654},[],[656],{"type":15,"value":657},"VkVideoCapabilitiesKHR",{"type":15,"value":659}," when calling ",{"type":10,"tag":166,"props":661,"children":663},{"className":662},[],[664],{"type":15,"value":665},"vkGetPhysicalDeviceVideoCapabilitiesKHR",{"type":15,"value":667}," with an H.264 encode profile:",{"type":10,"tag":381,"props":669,"children":671},{"className":383,"code":670,"language":385,"meta":386,"style":386},"typedef struct VkVideoEncodeH264QuantizationMapCapabilitiesKHR {\n VkStructureType sType;\n void* pNext;\n int32_t minQpDelta;\n int32_t maxQpDelta;\n} VkVideoEncodeH264QuantizationMapCapabilitiesKHR;\n",[672],{"type":10,"tag":166,"props":673,"children":674},{"__ignoreMap":386},[675,691,698,709,722,734],{"type":10,"tag":392,"props":676,"children":677},{"class":394,"line":395},[678,682,686],{"type":10,"tag":392,"props":679,"children":680},{"style":399},[681],{"type":15,"value":402},{"type":10,"tag":392,"props":683,"children":684},{"style":399},[685],{"type":15,"value":407},{"type":10,"tag":392,"props":687,"children":688},{"style":410},[689],{"type":15,"value":690}," VkVideoEncodeH264QuantizationMapCapabilitiesKHR {\n",{"type":10,"tag":392,"props":692,"children":693},{"class":394,"line":416},[694],{"type":10,"tag":392,"props":695,"children":696},{"style":410},[697],{"type":15,"value":422},{"type":10,"tag":392,"props":699,"children":700},{"class":394,"line":425},[701,705],{"type":10,"tag":392,"props":702,"children":703},{"style":399},[704],{"type":15,"value":431},{"type":10,"tag":392,"props":706,"children":707},{"style":410},[708],{"type":15,"value":436},{"type":10,"tag":392,"props":710,"children":711},{"class":394,"line":439},[712,717],{"type":10,"tag":392,"props":713,"children":714},{"style":399},[715],{"type":15,"value":716}," int32_t",{"type":10,"tag":392,"props":718,"children":719},{"style":410},[720],{"type":15,"value":721}," minQpDelta;\n",{"type":10,"tag":392,"props":723,"children":724},{"class":394,"line":448},[725,729],{"type":10,"tag":392,"props":726,"children":727},{"style":399},[728],{"type":15,"value":716},{"type":10,"tag":392,"props":730,"children":731},{"style":410},[732],{"type":15,"value":733}," maxQpDelta;\n",{"type":10,"tag":392,"props":735,"children":737},{"class":394,"line":736},6,[738],{"type":10,"tag":392,"props":739,"children":740},{"style":410},[741],{"type":15,"value":742},"} VkVideoEncodeH264QuantizationMapCapabilitiesKHR;\n",{"type":10,"tag":615,"props":744,"children":746},{"id":745},"_h_265_encode",[747],{"type":15,"value":748},"H.265 Encode",{"type":10,"tag":11,"props":750,"children":751},{},[752],{"type":15,"value":753},"In case of H.265 encode profiles, quantization delta maps are expected to contain QP delta values and thus the supported formats will always be single channel integer formats. 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