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elwrclandClaude Opus 5
0716678e70
Each macroblock's intra/inter decision is already made on its own when the PAK objects are emitted, so refreshing a region is a matter of coding the macroblocks it covers the way an I slice codes them. Regions divide the picture evenly along rows, columns or raster order, which leaves the block, block-row and block-column modes supported and gives empty regions for free when the cycle is longer than the split axis. Two things needed care. PAK keeps the I slice numbering for MbType5Bits inside a P slice, where H.264 itself offsets intra mb_types by 5; handing it the offset value hangs the MFC. And under constrained intra prediction a neighbour only counts as available if it is in the refresh region too, because prediction may not cross into an inter macroblock. Nothing constrains motion away from not-yet-refreshed regions, which is sound only because there is no motion estimation: every vector is zero, so a macroblock reads its own co-located block and never leaves its region. Motion estimation will have to honour VkVideoReferenceIntraRefreshInfoKHR's dirty region count. Per-picture-partition mode is not offered. It wants the refreshed slice coded as an I slice, header included, rather than as intra macroblocks inside a P slice. dEQP-VK.video.encode.h264.intra_refresh_* goes from 44 NotSupported to 12 Pass; all three modes pass in the variants that can run. The other 32 stop at a CTS precondition, maxDpbSlots >= GOP frame count, which the driver's two slots do not meet. Raising that needs real DPB slot tracking and is what gates B frames and ffmpeg's encoder too. Co-Authored-By: Claude Opus 5 <[email protected]>
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