[Mesa-dev] 10bit HEVC decoding for RadeonSI v2

[Mark Thompson]

On 08/03/17 12:29, Christian König wrote:
> Hi guys,
> 
> I finally found time testing this and hammering out (hopefully) all the
> remaining bugs. Playing a 10bit HEVC file through VAAPI with mpv/ffmpeg git
> master from about two days ago now works flawlessly and has only about 15% CPU
> load on one core on a Kaveri system.

Um, libav* is querying the capabilities and finding that only 8-bit output is supported for Main10:

        {
            "profile": 18,
            "name": "HEVCMain10",
            "description": "H.265 / MPEG-H part 2 (HEVC) Main 10 Profile",
            "entrypoints": [
                {
                    "entrypoint": 1,
                    "name": "VLD",
                    "description": "Decode Slice",
                    "attributes": [
                        {
                            "rt_formats": [
                                "YUV420",
                                "YUV420_10BPP",
                            ],
                        },
                    ],
                    "surface_formats": [
                        {
                            "rt_format": 1,
                            "memory_types": [
                                "VA",
                                "DRM_PRIME",
                            ],
                            "max_width": 16384,
                            "max_height": 16384,
                            "pixel_formats": [
                                "NV12",
                            ],
                        },
Unable to create config to test surface attributes: 14 (the requested RT Format is not supported)
                    ],
                },
            ],
        },

So, it works because it decodes to 8-bit surfaces and then everything is the same as 8-bit video after that.

(Continued in reply to 11/11.)