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RickandClaude Opus 5.5
6fd0e33431
Decode and Flush let FFmpeg crop every picture to its display size, so a 1080p H.264 stream came out as 1920x1080 with the chroma after 1080 luma rows. The console reports and writes the coded picture: EVO-PLAYER-PS5's hardware run of a 1080p H.264 IDR returned 1920x1088 with pitch 2048 and the chroma after the 1088 luma rows, and ProsperoLight rejects a 1080p H.264 or HEVC picture whose height is not 1088. FFmpeg's cropping is now off, so the frame size, the chroma offset and the sizes in the AVC picture info are those of the coded picture. The pitch is unchanged, and the frame size QueryDecoderMemoryInfo reports, which aligns the maximum height to 32 rows, still holds a picture coded within the maximum and the macroblock-padded H.264 picture of a maximum given as the display size. libSceVdecsw derived its crop offsets from the difference between that size and the macroblock grid, which is now zero. It takes the crop FFmpeg exports for the picture from libSceVideodec2 instead. The H.264 fixture is coded at 64x48 with frame_crop_bottom_offset 4: its pictures are checked at 64x48 and the crop through Vdecsw. The HEVC and VP9 fixtures are coded at 64x40 and keep their hashes. The new hashes come from FFmpeg 8.1 decoding with apply_cropping 0, hashed as the tests do; the same method reproduces every previous H.264, HEVC and VP9 hash. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
13 lines
2.9 KiB
Markdown
13 lines
2.9 KiB
Markdown
# libSceVideodec2 technical debt
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### Unknown function info
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- [sceVideodec2GetAvcPictureInfo](../../../core/libs/prx/libSceVideodec2/Export.cpp) (libSceVideodec2) - runs the `sceVideodec2GetPictureInfo` body (KytyPS5 binds both NIDs to one function; SharpProspero gives both the same `outputInfo, first, second` signature); the second (bottom field) picture info is never written, since only progressive H.264 output is modelled. prosper calls the AVC layout unestablished (no title observed calling it)
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### Functional
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- [sceVideodec2CreateDecoder](../../../core/libs/prx/libSceVideodec2/Export.cpp) (libSceVideodec2) decodes HEVC (codec type 974921) and VP9 (2382845) through FFmpeg, besides H.264. The tags come from SharpProspero's `Videodec2CodecType` and EVO-PLAYER-PS5's `sce_videodec2.h`, which records them from hardware runs. HEVC input is converted from length-prefixed NAL units to Annex B as for H.264, and VP9 frames are passed through. Output is the same 8-bit NV12 for every codec; a decoder for HEVC Main10 or VP9 Profile 2 is created, but a frame deeper than 8 bits throws, since the console's 10-bit output layout is unknown, and `QueryDecoderMemoryInfo` reports the 8-bit frame size for it. `sceVideodec2GetPictureInfo` and `sceVideodec2GetAvcPictureInfo` throw for HEVC and VP9 pictures, which use other layouts (`SceVideodec2HevcPictureInfo`, `SceVideodec2Vp9PictureInfo`), and `sceVideodec2GetHevcPictureInfo` is not exported; `sceVideodec2GetVp9PictureInfo` has its own VP9 layout
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- [sceVideodec2GetVp9PictureInfo](../../../core/libs/prx/libSceVideodec2/Export.cpp) uses the 88-byte layout and two-pointer signature from [SharpProspero Videodec2.cs](https://github.com/SvenGDK/SharpProspero/blob/5dfdb4b0b166e83dc9ae275001afb695f12c7174/src/SharpProspero/Interop/Video/Videodec2.cs). Frame metadata follows the [VP9 specification](https://storage.googleapis.com/downloads.webmproject.org/docs/vp9/vp9-bitstream-specification-v0.7-20170222-draft.pdf), sections 5.26 and 6.2: profile, key/intra-only flags, bit depth, color space/range, coded/render dimensions and superframe count are retained per emitted buffer. Level is 0 because the elementary stream does not signal a level; the console value is unverified. Null pointers, undersized structures and querying another codec throw; console error codes and support for other structure sizes are unknown. Existing NV12 output rejects pictures deeper than 8 bits. Superframes are submitted as individual coded frames to keep each output associated with its input metadata.
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- [sceVideodec2Decode](../../../core/libs/prx/libSceVideodec2/Export.cpp) (libSceVideodec2) and `sceVideodec2Flush` output the coded picture, with the chroma plane after its luma rows, as the console does for 1080p H.264 and HEVC streams coded at 1920x1088. An HEVC or VP9 picture whose size is not a multiple of 16, such as HEVC coded at 1920x1080, is output at that size; whether the console pads it is unverified. `sceVideodec2GetPictureInfo` reports no frame cropping
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