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Applications have to create a new video session parameters object for each new sequence header they intend to encode with.",{"type":10,"tag":11,"props":1503,"children":1504},{},[1505,1507,1512,1514,1520,1522,1527],{"type":15,"value":1506},"As implementations can override parameters in the sequence header stored in video session parameters objects, as described in the proposal for ",{"type":10,"tag":29,"props":1508,"children":1510},{"className":1509},[],[1511],{"type":15,"value":42},{"type":15,"value":1513},", the application has to use the ",{"type":10,"tag":29,"props":1515,"children":1517},{"className":1516},[],[1518],{"type":15,"value":1519},"vkGetEncodedVideoSessionParametersKHR",{"type":15,"value":1521}," command to retrieve information about or the data of the encoded sequence header. As AV1 encode video session parameters objects can only store a single AV1 sequence header, no new input or output structures needed to be specified for the ",{"type":10,"tag":29,"props":1523,"children":1525},{"className":1524},[],[1526],{"type":15,"value":1519},{"type":15,"value":1528}," command in this proposal.",{"type":10,"tag":11,"props":1530,"children":1531},{},[1532,1534,1539,1541,1547,1549,1555],{"type":15,"value":1533},"When requesting encoded bitstream data using the ",{"type":10,"tag":29,"props":1535,"children":1537},{"className":1536},[],[1538],{"type":15,"value":1519},{"type":15,"value":1540}," command, the output host data buffer will be filled with the encoded bitstream of the requested AV1 sequence header as an OBU with ",{"type":10,"tag":29,"props":1542,"children":1544},{"className":1543},[],[1545],{"type":15,"value":1546},"obu_type",{"type":15,"value":1548}," ",{"type":10,"tag":29,"props":1550,"children":1552},{"className":1551},[],[1553],{"type":15,"value":1554},"OBU_SEQUENCE_HEADER",{"type":15,"value":401},{"type":10,"tag":11,"props":1557,"children":1558},{},[1559,1561,1566,1568,1573],{"type":15,"value":1560},"As described in great detail in the proposal for the ",{"type":10,"tag":29,"props":1562,"children":1564},{"className":1563},[],[1565],{"type":15,"value":42},{"type":15,"value":1567}," extension, the application may have the option to encode the parameters otherwise stored in video session parameters object on its own. However, this may not result in a compliant bitstream if the implementation applied overrides to the sequence header, thus it is generally recommended for applications to use the encoded parameter set data retrieved using the ",{"type":10,"tag":29,"props":1569,"children":1571},{"className":1570},[],[1572],{"type":15,"value":1519},{"type":15,"value":1574}," command.",{"type":10,"tag":192,"props":1576,"children":1578},{"id":1577},"_av1_encoding_parameters",[1579],{"type":15,"value":1580},"AV1 Encoding Parameters",{"type":10,"tag":11,"props":1582,"children":1583},{},[1584,1586,1591,1592,1598],{"type":15,"value":1585},"Encode parameters specific to AV1 need to be provided by the application through the ",{"type":10,"tag":29,"props":1587,"children":1589},{"className":1588},[],[1590],{"type":15,"value":420},{"type":15,"value":522},{"type":10,"tag":29,"props":1593,"children":1595},{"className":1594},[],[1596],{"type":15,"value":1597},"VkVideoEncodeInfoKHR",{"type":15,"value":1599},", using the following new structure:",{"type":10,"tag":144,"props":1601,"children":1603},{"className":146,"code":1602,"language":148,"meta":149,"style":149},"typedef struct VkVideoEncodeAV1PictureInfoKHR {\n    VkStructureType                             sType;\n    const void*                                 pNext;\n    VkVideoEncodeAV1PredictionModeKHR           predictionMode;\n    VkVideoEncodeAV1RateControlGroupKHR         rateControlGroup;\n    const StdVideoEncodeAV1PictureInfo*         pStdPictureInfo;\n    int32_t                                     referenceNameSlotIndices[VK_MAX_VIDEO_AV1_REFERENCES_PER_FRAME_KHR];\n    VkBool32                                    primaryReferenceCdfOnly;\n    VkBool32                                    generateObuExtensionHeader;\n} VkVideoEncodeAV1PictureInfoKHR;\n",[1604],{"type":10,"tag":29,"props":1605,"children":1606},{"__ignoreMap":149},[1607,1623,1630,1645,1653,1661,1682,1701,1709,1717],{"type":10,"tag":155,"props":1608,"children":1609},{"class":157,"line":158},[1610,1614,1618],{"type":10,"tag":155,"props":1611,"children":1612},{"style":162},[1613],{"type":15,"value":437},{"type":10,"tag":155,"props":1615,"children":1616},{"style":162},[1617],{"type":15,"value":442},{"type":10,"tag":155,"props":1619,"children":1620},{"style":445},[1621],{"type":15,"value":1622}," VkVideoEncodeAV1PictureInfoKHR {\n",{"type":10,"tag":155,"props":1624,"children":1625},{"class":157,"line":174},[1626],{"type":10,"tag":155,"props":1627,"children":1628},{"style":445},[1629],{"type":15,"value":1361},{"type":10,"tag":155,"props":1631,"children":1632},{"class":157,"line":459},[1633,1637,1641],{"type":10,"tag":155,"props":1634,"children":1635},{"style":162},[1636],{"type":15,"value":465},{"type":10,"tag":155,"props":1638,"children":1639},{"style":162},[1640],{"type":15,"value":470},{"type":10,"tag":155,"props":1642,"children":1643},{"style":445},[1644],{"type":15,"value":1377},{"type":10,"tag":155,"props":1646,"children":1647},{"class":157,"line":478},[1648],{"type":10,"tag":155,"props":1649,"children":1650},{"style":445},[1651],{"type":15,"value":1652},"    VkVideoEncodeAV1PredictionModeKHR           predictionMode;\n",{"type":10,"tag":155,"props":1654,"children":1655},{"class":157,"line":487},[1656],{"type":10,"tag":155,"props":1657,"children":1658},{"style":445},[1659],{"type":15,"value":1660},"    VkVideoEncodeAV1RateControlGroupKHR         rateControlGroup;\n",{"type":10,"tag":155,"props":1662,"children":1663},{"class":157,"line":600},[1664,1668,1673,1677],{"type":10,"tag":155,"props":1665,"children":1666},{"style":162},[1667],{"type":15,"value":465},{"type":10,"tag":155,"props":1669,"children":1670},{"style":445},[1671],{"type":15,"value":1672}," StdVideoEncodeAV1PictureInfo",{"type":10,"tag":155,"props":1674,"children":1675},{"style":162},[1676],{"type":15,"value":1394},{"type":10,"tag":155,"props":1678,"children":1679},{"style":445},[1680],{"type":15,"value":1681},"         pStdPictureInfo;\n",{"type":10,"tag":155,"props":1683,"children":1684},{"class":157,"line":609},[1685,1690,1696],{"type":10,"tag":155,"props":1686,"children":1687},{"style":162},[1688],{"type":15,"value":1689},"    int32_t",{"type":10,"tag":155,"props":1691,"children":1693},{"style":1692},"--shiki-default:#953800;--shiki-dark:#FFA657",[1694],{"type":15,"value":1695},"                                     referenceNameSlotIndices",{"type":10,"tag":155,"props":1697,"children":1698},{"style":445},[1699],{"type":15,"value":1700},"[VK_MAX_VIDEO_AV1_REFERENCES_PER_FRAME_KHR];\n",{"type":10,"tag":155,"props":1702,"children":1703},{"class":157,"line":618},[1704],{"type":10,"tag":155,"props":1705,"children":1706},{"style":445},[1707],{"type":15,"value":1708},"    VkBool32                                    primaryReferenceCdfOnly;\n",{"type":10,"tag":155,"props":1710,"children":1711},{"class":157,"line":627},[1712],{"type":10,"tag":155,"props":1713,"children":1714},{"style":445},[1715],{"type":15,"value":1716},"    VkBool32                                    generateObuExtensionHeader;\n",{"type":10,"tag":155,"props":1718,"children":1719},{"class":157,"line":636},[1720],{"type":10,"tag":155,"props":1721,"children":1722},{"style":445},[1723],{"type":15,"value":1724},"} VkVideoEncodeAV1PictureInfoKHR;\n",{"type":10,"tag":11,"props":1726,"children":1727},{},[1728,1734],{"type":10,"tag":29,"props":1729,"children":1731},{"className":1730},[],[1732],{"type":15,"value":1733},"predictionMode",{"type":15,"value":1735}," specifies the used AV1 prediction mode for the frame and can have one of the following values:",{"type":10,"tag":76,"props":1737,"children":1738},{},[1739,1750,1761,1772],{"type":10,"tag":80,"props":1740,"children":1741},{},[1742,1748],{"type":10,"tag":29,"props":1743,"children":1745},{"className":1744},[],[1746],{"type":15,"value":1747},"VK_VIDEO_ENCODE_AV1_PREDICTION_MODE_INTRA_ONLY_KHR",{"type":15,"value":1749}," - the frame is encoded with intra-only prediction, used when encoding key frames and intra-only frames (all AV1 mode info blocks will be encoded with intra-only prediction)",{"type":10,"tag":80,"props":1751,"children":1752},{},[1753,1759],{"type":10,"tag":29,"props":1754,"children":1756},{"className":1755},[],[1757],{"type":15,"value":1758},"VK_VIDEO_ENCODE_AV1_PREDICTION_MODE_SINGLE_REFERENCE_KHR",{"type":15,"value":1760}," - the frame is encoded with single reference prediction (individual AV1 mode info blocks may use intra-only or single reference prediction)",{"type":10,"tag":80,"props":1762,"children":1763},{},[1764,1770],{"type":10,"tag":29,"props":1765,"children":1767},{"className":1766},[],[1768],{"type":15,"value":1769},"VK_VIDEO_ENCODE_AV1_PREDICTION_MODE_UNIDIRECTIONAL_COMPOUND_KHR",{"type":15,"value":1771}," - the frame is encoded with unidirectional compound prediction (individual AV1 mode info blocks may use intra-only, single reference, or unidirectional compound prediction)",{"type":10,"tag":80,"props":1773,"children":1774},{},[1775,1781],{"type":10,"tag":29,"props":1776,"children":1778},{"className":1777},[],[1779],{"type":15,"value":1780},"VK_VIDEO_ENCODE_AV1_PREDICTION_MODE_BIDIRECTIONAL_COMPOUND_KHR",{"type":15,"value":1782}," - the frame is encoded with bidirectional compound prediction (individual AV1 mode info blocks may use intra-only, single reference, unidirectional compound, or bidirectional compound prediction)",{"type":10,"tag":11,"props":1784,"children":1785},{},[1786,1792],{"type":10,"tag":29,"props":1787,"children":1789},{"className":1788},[],[1790],{"type":15,"value":1791},"rateControlGroup",{"type":15,"value":1793}," specifies which rate control group does the encoded frame fall into. Many rate control parameters can have different values for each rate control group (e.g. min/max quantizer index). This parameter indicates which set of rate control parameters should the implementation’s rate control algorithm apply to the encoded frame.",{"type":10,"tag":11,"props":1795,"children":1796},{},[1797,1803,1805,1810],{"type":10,"tag":29,"props":1798,"children":1800},{"className":1799},[],[1801],{"type":15,"value":1802},"pStdPictureInfo",{"type":15,"value":1804}," points to the codec-specific encode parameters defined in the ",{"type":10,"tag":29,"props":1806,"children":1808},{"className":1807},[],[1809],{"type":15,"value":135},{"type":15,"value":1811}," video std header (including the AV1 frame header parameters).",{"type":10,"tag":11,"props":1813,"children":1814},{},[1815,1816,1822,1824,1830,1832,1838,1840,1846],{"type":15,"value":27},{"type":10,"tag":29,"props":1817,"children":1819},{"className":1818},[],[1820],{"type":15,"value":1821},"referenceNameSlotIndices",{"type":15,"value":1823}," array provides a mapping from AV1 reference names to the DPB slot indices currently associated with the used reference picture resources. Multiple AV1 reference names may refer to the same DPB slot, while unused AV1 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 AV1 reference name ",{"type":10,"tag":29,"props":1825,"children":1827},{"className":1826},[],[1828],{"type":15,"value":1829},"frame",{"type":15,"value":1831}," (as defined in the enumeration type ",{"type":10,"tag":29,"props":1833,"children":1835},{"className":1834},[],[1836],{"type":15,"value":1837},"StdVideoAV1ReferenceName",{"type":15,"value":1839},") the corresponding DPB slot index is specified in ",{"type":10,"tag":29,"props":1841,"children":1843},{"className":1842},[],[1844],{"type":15,"value":1845},"referenceNameSlotIndices[frame - STD_VIDEO_AV1_REFERENCE_NAME_LAST_FRAME]",{"type":15,"value":1847},". Further details are provided about the AV1 reference management model later, in a dedicated section of this proposal.",{"type":10,"tag":11,"props":1849,"children":1850},{},[1851,1853,1859,1861,1867,1869,1874],{"type":15,"value":1852},"If ",{"type":10,"tag":29,"props":1854,"children":1856},{"className":1855},[],[1857],{"type":15,"value":1858},"primaryReferenceCdfOnly",{"type":15,"value":1860}," is set to ",{"type":10,"tag":29,"props":1862,"children":1864},{"className":1863},[],[1865],{"type":15,"value":1866},"VK_TRUE",{"type":15,"value":1868},", the primary reference indicated by the ",{"type":10,"tag":29,"props":1870,"children":1872},{"className":1871},[],[1873],{"type":15,"value":914},{"type":15,"value":1875}," codec parameter will be used only for CDF data reference but not for picture prediction.",{"type":10,"tag":11,"props":1877,"children":1878},{},[1879,1880,1886,1887,1892],{"type":15,"value":1852},{"type":10,"tag":29,"props":1881,"children":1883},{"className":1882},[],[1884],{"type":15,"value":1885},"generateObuExtensionHeader",{"type":15,"value":1860},{"type":10,"tag":29,"props":1888,"children":1890},{"className":1889},[],[1891],{"type":15,"value":1866},{"type":15,"value":1893},", the generated bitstream will include OBU extension headers.",{"type":10,"tag":11,"props":1895,"children":1896},{},[1897],{"type":15,"value":1898},"The active sequence header is the one stored in the bound video session parameters object.",{"type":10,"tag":11,"props":1900,"children":1901},{},[1902,1904,1909,1911,1917,1919,1924,1925,1931],{"type":15,"value":1903},"Picture information specific to AV1 for the active reference pictures and the optional reconstructed picture need to be provided by the application through the ",{"type":10,"tag":29,"props":1905,"children":1907},{"className":1906},[],[1908],{"type":15,"value":420},{"type":15,"value":1910}," chain of corresponding elements of ",{"type":10,"tag":29,"props":1912,"children":1914},{"className":1913},[],[1915],{"type":15,"value":1916},"VkVideoEncodeInfoKHR::pReferenceSlots",{"type":15,"value":1918}," and the ",{"type":10,"tag":29,"props":1920,"children":1922},{"className":1921},[],[1923],{"type":15,"value":420},{"type":15,"value":522},{"type":10,"tag":29,"props":1926,"children":1928},{"className":1927},[],[1929],{"type":15,"value":1930},"VkVideoEncodeInfoKHR::pSetupReferenceSlot",{"type":15,"value":1932},", respectively, using the following new structure:",{"type":10,"tag":144,"props":1934,"children":1936},{"className":146,"code":1935,"language":148,"meta":149,"style":149},"typedef struct VkVideoEncodeAV1DpbSlotInfoKHR {\n    VkStructureType                           sType;\n    const void*                               pNext;\n    const StdVideoEncodeAV1ReferenceInfo*     pStdReferenceInfo;\n} VkVideoEncodeAV1DpbSlotInfoKHR;\n",[1937],{"type":10,"tag":29,"props":1938,"children":1939},{"__ignoreMap":149},[1940,1956,1964,1980,2001],{"type":10,"tag":155,"props":1941,"children":1942},{"class":157,"line":158},[1943,1947,1951],{"type":10,"tag":155,"props":1944,"children":1945},{"style":162},[1946],{"type":15,"value":437},{"type":10,"tag":155,"props":1948,"children":1949},{"style":162},[1950],{"type":15,"value":442},{"type":10,"tag":155,"props":1952,"children":1953},{"style":445},[1954],{"type":15,"value":1955}," VkVideoEncodeAV1DpbSlotInfoKHR {\n",{"type":10,"tag":155,"props":1957,"children":1958},{"class":157,"line":174},[1959],{"type":10,"tag":155,"props":1960,"children":1961},{"style":445},[1962],{"type":15,"value":1963},"    VkStructureType                           sType;\n",{"type":10,"tag":155,"props":1965,"children":1966},{"class":157,"line":459},[1967,1971,1975],{"type":10,"tag":155,"props":1968,"children":1969},{"style":162},[1970],{"type":15,"value":465},{"type":10,"tag":155,"props":1972,"children":1973},{"style":162},[1974],{"type":15,"value":470},{"type":10,"tag":155,"props":1976,"children":1977},{"style":445},[1978],{"type":15,"value":1979},"                               pNext;\n",{"type":10,"tag":155,"props":1981,"children":1982},{"class":157,"line":478},[1983,1987,1992,1996],{"type":10,"tag":155,"props":1984,"children":1985},{"style":162},[1986],{"type":15,"value":465},{"type":10,"tag":155,"props":1988,"children":1989},{"style":445},[1990],{"type":15,"value":1991}," StdVideoEncodeAV1ReferenceInfo",{"type":10,"tag":155,"props":1993,"children":1994},{"style":162},[1995],{"type":15,"value":1394},{"type":10,"tag":155,"props":1997,"children":1998},{"style":445},[1999],{"type":15,"value":2000},"     pStdReferenceInfo;\n",{"type":10,"tag":155,"props":2002,"children":2003},{"class":157,"line":487},[2004],{"type":10,"tag":155,"props":2005,"children":2006},{"style":445},[2007],{"type":15,"value":2008},"} VkVideoEncodeAV1DpbSlotInfoKHR;\n",{"type":10,"tag":11,"props":2010,"children":2011},{},[2012,2018,2020,2025],{"type":10,"tag":29,"props":2013,"children":2015},{"className":2014},[],[2016],{"type":15,"value":2017},"pStdReferenceInfo",{"type":15,"value":2019}," points to the codec-specific reference picture parameters defined in the ",{"type":10,"tag":29,"props":2021,"children":2023},{"className":2022},[],[2024],{"type":15,"value":135},{"type":15,"value":2026}," video std header.",{"type":10,"tag":11,"props":2028,"children":2029},{},[2030],{"type":15,"value":2031},"It is the application’s responsibility to specify codec-specific parameters that are compliant to the rules defined by the AV1 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 encode operation to complete unsuccessfully and will cause the output bitstream and the reconstructed picture, if one is specified, to have undefined contents after the execution of the operation.",{"type":10,"tag":11,"props":2033,"children":2034},{},[2035,2037,2043],{"type":15,"value":2036},"Implementations may override some of these parameters in order to conform to any restrictions of the encoder implementation, but that will not affect the overall operation of the encoding. The application has the option to also opt-in for additional optimizing overrides that can result in better performance or efficiency tailored to the usage scenario by creating the video session with the new ",{"type":10,"tag":29,"props":2038,"children":2040},{"className":2039},[],[2041],{"type":15,"value":2042},"VK_VIDEO_SESSION_CREATE_ALLOW_ENCODE_PARAMETER_OPTIMIZATIONS_BIT_KHR",{"type":15,"value":2044}," flag.",{"type":10,"tag":11,"props":2046,"children":2047},{},[2048,2050,2059],{"type":15,"value":2049},"For more information about individual AV1 bitstream syntax elements, derived values, and, in general, how to interpret these parameters, please refer to the corresponding sections of the ",{"type":10,"tag":2051,"props":2052,"children":2056},"a",{"href":2053,"rel":2054},"https://aomediacodec.github.io/av1-spec/av1-spec.pdf",[2055],"nofollow",[2057],{"type":15,"value":2058},"AV1 Specification",{"type":15,"value":401},{"type":10,"tag":192,"props":2061,"children":2063},{"id":2062},"_av1_reference_management",[2064],{"type":15,"value":2065},"AV1 Reference Management",{"type":10,"tag":11,"props":2067,"children":2068},{},[2069,2071,2076,2077,2083,2084,2090,2091,2097,2098,2104,2105,2111,2112,2118,2120,2126],{"type":15,"value":2070},"The AV1 video compression standard supports each frame to reference up to 7 + 1 reference pictures for sample prediction. The seven \"real\" reference pictures are identified with so called AV1 reference names (",{"type":10,"tag":29,"props":2072,"children":2074},{"className":2073},[],[2075],{"type":15,"value":1144},{"type":15,"value":1042},{"type":10,"tag":29,"props":2078,"children":2080},{"className":2079},[],[2081],{"type":15,"value":2082},"LAST2_FRAME",{"type":15,"value":1042},{"type":10,"tag":29,"props":2085,"children":2087},{"className":2086},[],[2088],{"type":15,"value":2089},"LAST3_FRAME",{"type":15,"value":1042},{"type":10,"tag":29,"props":2092,"children":2094},{"className":2093},[],[2095],{"type":15,"value":2096},"GOLDEN_FRAME",{"type":15,"value":1042},{"type":10,"tag":29,"props":2099,"children":2101},{"className":2100},[],[2102],{"type":15,"value":2103},"BWDREF_FRAME",{"type":15,"value":1042},{"type":10,"tag":29,"props":2106,"children":2108},{"className":2107},[],[2109],{"type":15,"value":2110},"ALTREF2_FRAME",{"type":15,"value":1050},{"type":10,"tag":29,"props":2113,"children":2115},{"className":2114},[],[2116],{"type":15,"value":2117},"ALTREF_FRAME",{"type":15,"value":2119},") identifying different types of forward and backward references. Each AV1 reference name has associated semantics that affect how the reference picture data is used for inter-frame sample prediction. In addition, there is a special AV1 reference name called ",{"type":10,"tag":29,"props":2121,"children":2123},{"className":2122},[],[2124],{"type":15,"value":2125},"INTRA_FRAME",{"type":15,"value":2127}," that corresponds to the currently decoded frame used for intra-frame sample prediction.",{"type":10,"tag":11,"props":2129,"children":2130},{},[2131],{"type":15,"value":2132},"The AV1 decoder model also incorporates the concept of a VBI which has 8 slots and maintains the set of reference pictures and associated metadata that can be included in the list of active reference pictures when decoding subsequent frames. The reference frame update process detailed in section 7.20 of the AV1 specification allows associating multiple VBI slots with the same reference picture and logically replicating the metadata associated with the activated reference picture across these VBI slots.",{"type":10,"tag":11,"props":2134,"children":2135},{},[2136,2138,2143,2145,2151],{"type":15,"value":2137},"The reference names used during encoding is primarily dicated by the non-negative elements of ",{"type":10,"tag":29,"props":2139,"children":2141},{"className":2140},[],[2142],{"type":15,"value":1128},{"type":15,"value":2144}," which refer to the DPB slot index of an active reference picture. However, additional AV1 syntax elements need to be specified in line with that, like the ",{"type":10,"tag":29,"props":2146,"children":2148},{"className":2147},[],[2149],{"type":15,"value":2150},"ref_frame_idx[]",{"type":15,"value":2152}," array that specifies the AV1 VBI slot indices corresponding to the AV1 reference names. VBI management and the correctness of all other reference related video std parameters are entirely the responsibility of the application, so the input video std parameters must be in line with the requirements of the AV1 specification in order for the resulting bitstream to be compliant with it.",{"type":10,"tag":11,"props":2154,"children":2155},{},[2156],{"type":15,"value":2157},"The implementation may choose to reduce the set of used AV1 reference names, as needed based on the reference count and reference mask capabilities discussed earlier, or as decided by the implementation (e.g. for performance or quality reasons).",{"type":10,"tag":192,"props":2159,"children":2161},{"id":2160},"_av1_rate_control",[2162],{"type":15,"value":2163},"AV1 Rate Control",{"type":10,"tag":11,"props":2165,"children":2166},{},[2167],{"type":15,"value":2168},"This proposal adds a set of optional rate control parameters specific to AV1 encoding that provide additional guidance to the implementation’s rate 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In what form should codec-specific parameters be provided?",{"type":10,"tag":11,"props":7989,"children":7990},{},[7991,7993,7998,7999,8004],{"type":15,"value":7992},"In the form of structures defined by the ",{"type":10,"tag":29,"props":7994,"children":7996},{"className":7995},[],[7997],{"type":15,"value":135},{"type":15,"value":67},{"type":10,"tag":29,"props":8000,"children":8002},{"className":8001},[],[8003],{"type":15,"value":124},{"type":15,"value":8005}," video std headers. Applications are responsible to populate the structures defined by the video std headers. It is also the application’s responsibility to maintain and manage these data structures, as needed, to be able to provide them as inputs to video encode operations where needed.",{"type":10,"tag":192,"props":8007,"children":8009},{"id":8008},"_resolved_what_are_the_requirements_for_the_codec_specific_input_parameters",[8010],{"type":15,"value":8011},"RESOLVED: What are the requirements for the codec-specific input parameters?",{"type":10,"tag":11,"props":8013,"children":8014},{},[8015],{"type":15,"value":8016},"It is legal from an API usage perspective for the application to provide any values for the codec-specific input parameters (sequence header, picture information, etc.). However, if the input data does not conform to the requirements of the AV1 video compression standard, then video encode operations may complete unsuccessfully and, in general, the outputs produced by the video encode operation will have undefined contents.",{"type":10,"tag":11,"props":8018,"children":8019},{},[8020,8022,8028],{"type":15,"value":8021},"In addition, certain commands may return the ",{"type":10,"tag":29,"props":8023,"children":8025},{"className":8024},[],[8026],{"type":15,"value":8027},"VK_ERROR_INVALID_VIDEO_STD_PARAMETERS_KHR",{"type":15,"value":8029}," error if any of the specified codec-specific parameters do not adhere to the syntactic or semantic requirements of the AV1 video compression standard or if values derived from parameters according to the rules defined by the AV1 video compression standard do not adhere to the capabilities of the AV1 video compression standard or the implementation. In particular, in this extension the following commands may return this error code:",{"type":10,"tag":76,"props":8031,"children":8032},{},[8033,8049],{"type":10,"tag":80,"props":8034,"children":8035},{},[8036,8041,8042,8047],{"type":10,"tag":29,"props":8037,"children":8039},{"className":8038},[],[8040],{"type":15,"value":4423},{"type":15,"value":218},{"type":10,"tag":29,"props":8043,"children":8045},{"className":8044},[],[8046],{"type":15,"value":1499},{"type":15,"value":8048}," - if the specified parameter sets are invalid according to these rules",{"type":10,"tag":80,"props":8050,"children":8051},{},[8052,8058],{"type":10,"tag":29,"props":8053,"children":8055},{"className":8054},[],[8056],{"type":15,"value":8057},"vkEndCommandBuffer",{"type":15,"value":8059}," - if the codec-specific picture information provided to video encode operations are invalid according to these rules",{"type":10,"tag":11,"props":8061,"children":8062},{},[8063],{"type":15,"value":8064},"Generating errors in the cases above, however, is not required so applications should not rely on receiving an error code for the purposes of verifying the correctness of the used codec-specific parameters.",{"type":10,"tag":192,"props":8066,"children":8068},{"id":8067},"_resolved_are_obu_extension_headers_generated_by_the_implementation_when_multiple_temporal_or_spatial_layers_are_used",[8069],{"type":15,"value":8070},"RESOLVED: Are OBU extension headers generated by the implementation when multiple temporal or spatial layers are used?",{"type":10,"tag":11,"props":8072,"children":8073},{},[8074,8076,8081,8083,8089],{"type":15,"value":8075},"Implementation support for OBU extension header generation is indicated by the ",{"type":10,"tag":29,"props":8077,"children":8079},{"className":8078},[],[8080],{"type":15,"value":895},{"type":15,"value":8082}," capability flag. If supported by the video profile, the application can explicitly opt in to generate OBU extension headers using ",{"type":10,"tag":29,"props":8084,"children":8086},{"className":8085},[],[8087],{"type":15,"value":8088},"VkVideoEncodeAV1PictureInfoKHR::generateObuExtensionHeader",{"type":15,"value":401},{"type":10,"tag":192,"props":8091,"children":8093},{"id":8092},"_resolved_what_codec_specific_parameters_are_guaranteed_to_not_be_overridden_by_implementations",[8094],{"type":15,"value":8095},"RESOLVED: What codec-specific parameters are guaranteed to not be overridden by implementations?",{"type":10,"tag":11,"props":8097,"children":8098},{},[8099,8101,8106],{"type":15,"value":8100},"This proposal requires that implementations do not override a certain set of codec-specific parameters. It also provides guarantees for certain codec-specific parameters in specific conditions. In addition, bits set in the ",{"type":10,"tag":29,"props":8102,"children":8104},{"className":8103},[],[8105],{"type":15,"value":1303},{"type":15,"value":8107}," capability provide additional guarantees about other Video Std parameters that the implementation will use without overriding them. Future extensions may include capability flags providing additional guarantees based on the needs of the users of the API.",{"type":10,"tag":192,"props":8109,"children":8111},{"id":8110},"_resolved_how_is_reference_picture_setup_requested_for_av1_encode_operations",[8112],{"type":15,"value":8113},"RESOLVED: How is reference picture setup requested for AV1 encode operations?",{"type":10,"tag":11,"props":8115,"children":8116},{},[8117],{"type":15,"value":8118},"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 reference picture setup is requested and, in response, the DPB slot is activated with the reconstructed picture.",{"type":10,"tag":11,"props":8120,"children":8121},{},[8122,8124,8130,8132,8138,8140,8145],{"type":15,"value":8123},"In the case of AV1 encode, reference picture setup depends on the value of ",{"type":10,"tag":29,"props":8125,"children":8127},{"className":8126},[],[8128],{"type":15,"value":8129},"StdVideoEncodeAV1PictureInfo::refresh_frame_flags",{"type":15,"value":8131},". A non-zero ",{"type":10,"tag":29,"props":8133,"children":8135},{"className":8134},[],[8136],{"type":15,"value":8137},"refresh_frame_flags",{"type":15,"value":8139}," 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. While VBI slot management is outside of the scope of this proposal, and the responsibility of the application, a non-zero ",{"type":10,"tag":29,"props":8141,"children":8143},{"className":8142},[],[8144],{"type":15,"value":8137},{"type":15,"value":8146}," value inherently also implies the need for reference picture setup and thus the activation of a DPB slot with the reconstructed picture.",{"type":10,"tag":11,"props":8148,"children":8149},{},[8150,8152,8157],{"type":15,"value":8151},"Accordingly, for AV1 encode, reference picture setup is requested and the DPB slot specified for the reconstructed picture is activated with the picture if and only if ",{"type":10,"tag":29,"props":8153,"children":8155},{"className":8154},[],[8156],{"type":15,"value":8129},{"type":15,"value":8158}," is not zero.",{"type":10,"tag":192,"props":8160,"children":8162},{"id":8161},"_resolved_should_we_have_separate_rate_control_configuration_parameters_quantizer_indices_frame_sizes_for_each_av1_prediction_mode",[8163],{"type":15,"value":8164},"RESOLVED: Should we have separate rate control configuration parameters (quantizer indices, frame sizes) for each AV1 prediction mode?",{"type":10,"tag":11,"props":8166,"children":8167},{},[8168],{"type":15,"value":8169},"No. Implementations typically only support configuration for three different categories, in line with other codecs. Also, the AV1 prediction mode does not provide information about the direction of the prediction. This proposal thus instead defines a separate rate control group parameter that is used as input by rate control to decide which category the current frame falls into.",{"type":10,"tag":192,"props":8171,"children":8173},{"id":8172},"_resolved_how_can_the_application_indicate_the_use_of_a_primary_ref_frame_that_is_used_for_cdf_data_but_not_for_picture_prediction",[8174,8176,8181],{"type":15,"value":8175},"RESOLVED: How can the application indicate the use of a ",{"type":10,"tag":29,"props":8177,"children":8179},{"className":8178},[],[8180],{"type":15,"value":914},{"type":15,"value":8182}," that is used for CDF data but not for picture prediction?",{"type":10,"tag":11,"props":8184,"children":8185},{},[8186,8188,8193,8195,8200],{"type":15,"value":8187},"Through the ",{"type":10,"tag":29,"props":8189,"children":8191},{"className":8190},[],[8192],{"type":15,"value":1858},{"type":15,"value":8194}," encode parameter. When enabled, the primary reference frame will only be used as CDF data reference and will not be used for picture prediction. This mode is only supported when the ",{"type":10,"tag":29,"props":8196,"children":8198},{"className":8197},[],[8199],{"type":15,"value":906},{"type":15,"value":8201}," capability flag is supported for the AV1 encode profile.",{"type":10,"tag":192,"props":8203,"children":8205},{"id":8204},"_resolved_why_there_is_no_maxunidirectionalcompoundgroup2referencecount_capability",[8206,8208,8214],{"type":15,"value":8207},"RESOLVED: Why there is no ",{"type":10,"tag":29,"props":8209,"children":8211},{"className":8210},[],[8212],{"type":15,"value":8213},"maxUnidirectionalCompoundGroup2ReferenceCount",{"type":15,"value":8215}," capability?",{"type":10,"tag":11,"props":8217,"children":8218},{},[8219,8221,8227,8228,8234,8236,8241,8243,8248],{"type":15,"value":8220},"In case of unidirectional compound prediction, the only combination of AV1 reference names that are allowed from the reference frame group 2 is ",{"type":10,"tag":29,"props":8222,"children":8224},{"className":8223},[],[8225],{"type":15,"value":8226},"BWDREF",{"type":15,"value":67},{"type":10,"tag":29,"props":8229,"children":8231},{"className":8230},[],[8232],{"type":15,"value":8233},"ALTREF",{"type":15,"value":8235}," so a ",{"type":10,"tag":29,"props":8237,"children":8239},{"className":8238},[],[8240],{"type":15,"value":8213},{"type":15,"value":8242}," capability would not provide any further information about the supported reference frame count in this case that could not already be determined by checking the corresponding bits of ",{"type":10,"tag":29,"props":8244,"children":8246},{"className":8245},[],[8247],{"type":15,"value":1108},{"type":15,"value":401},{"type":10,"tag":192,"props":8250,"children":8252},{"id":8251},"_resolved_why_are_implementations_allowed_to_override_the_coded_resolution",[8253],{"type":15,"value":8254},"RESOLVED: Why are implementations allowed to override the coded resolution?",{"type":10,"tag":11,"props":8256,"children":8257},{},[8258],{"type":15,"value":8259},"AV1 content is coded at an 8x8 granularity and, correspondingly, the AV1 specification only allows cropping of up to 7 pixel rows and/or columns to be able to represent streams of any resolution. Some implementations have larger alignment requirements than 8x8, and although similar limitations existed in H.264 and H.265, the range of the explicit cropping syntax for those video codecs allows implementations to override picture width and height syntax without affecting the output resolution. Without the existence of such cropping syntax in AV1 that allow for cropping more than 7 pixel rows and/or columns, implementations that cannot output at an 8x8 pixel granularity, as required by the AV1 specification, are not able to code all resolutions natively.",{"type":10,"tag":11,"props":8261,"children":8262},{},[8263,8265,8271],{"type":15,"value":8264},"In the presence of such limitations, given an unaligned input, implementations are able to align the resolution and source the extra pixels without any input from the application (there is precedent for this with ",{"type":10,"tag":29,"props":8266,"children":8268},{"className":8267},[],[8269],{"type":15,"value":8270},"VkVideoEncodeCapabilitiesKHR::encodeInputPictureGranularity",{"type":15,"value":8272},"). This makes an enforced capability undesirable, as applications would need to ensure picture resources are created and allocated accordingly. Instead, this proposal allows implementations to override the resolution of the bitstream.",{"type":10,"tag":11,"props":8274,"children":8275},{},[8276,8282,8284,8290,8292,8297,8299,8304],{"type":10,"tag":29,"props":8277,"children":8279},{"className":8278},[],[8280],{"type":15,"value":8281},"VkVideoEncodeAV1CapabilitiesKHR::codedPictureAlignment",{"type":15,"value":8283}," is added to inform applications of implementation requirements. If the requested ",{"type":10,"tag":29,"props":8285,"children":8287},{"className":8286},[],[8288],{"type":15,"value":8289},"codedExtent",{"type":15,"value":8291}," rounded up to be aligned to the 8x8 granularity is not aligned to ",{"type":10,"tag":29,"props":8293,"children":8295},{"className":8294},[],[8296],{"type":15,"value":981},{"type":15,"value":8298},", implementations will enlargen the resolution to be aligned to ",{"type":10,"tag":29,"props":8300,"children":8302},{"className":8301},[],[8303],{"type":15,"value":981},{"type":15,"value":8305},". This approach requires no change in application behavior on the encoder side, the actual override is well-defined, and encoding is performed according to this extent, allowing applications to compute the exact resolution of the bitstream. Applications can choose to align their input content to the implementation limitation, or let the implementation handle it. Either way, however, applications need to signal relevant cropping parameters in a side channel (i.e. a container) and handle that information on the decoder side if they intend to display or otherwise reproduce the content at its original resolution.",{"type":10,"tag":11,"props":8307,"children":8308},{},[8309],{"type":15,"value":8310},"For example:",{"type":10,"tag":76,"props":8312,"children":8313},{},[8314,8327,8348],{"type":10,"tag":80,"props":8315,"children":8316},{},[8317,8319,8325],{"type":15,"value":8318},"Implementations that report ",{"type":10,"tag":29,"props":8320,"children":8322},{"className":8321},[],[8323],{"type":15,"value":8324},"codedPictureAlignment = {8,8}",{"type":15,"value":8326}," are able to encode any resolution, the encoded resolution will always match the requested resolution.",{"type":10,"tag":80,"props":8328,"children":8329},{},[8330,8332,8338,8340,8346],{"type":15,"value":8331},"Implementation reports ",{"type":10,"tag":29,"props":8333,"children":8335},{"className":8334},[],[8336],{"type":15,"value":8337},"codedPictureAlignment = {16,16}",{"type":15,"value":8339},", and an application requests to code 1920x1080. Since 1920x1080 is not aligned to ",{"type":10,"tag":29,"props":8341,"children":8343},{"className":8342},[],[8344],{"type":15,"value":8345},"{16,16}",{"type":15,"value":8347},", the implementation will encode a 1920x1088 video.",{"type":10,"tag":80,"props":8349,"children":8350},{},[8351,8352,8357,8359,8364],{"type":15,"value":8331},{"type":10,"tag":29,"props":8353,"children":8355},{"className":8354},[],[8356],{"type":15,"value":8337},{"type":15,"value":8358},", and an application requests to code 1920x1082. The nearest 8x8 alignment of this resolution is 1920x1088, which is already aligned to ",{"type":10,"tag":29,"props":8360,"children":8362},{"className":8361},[],[8363],{"type":15,"value":981},{"type":15,"value":8365},". 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