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VASliceParameterBufferMPEG2.slice_vertical_position shall express the slice vertical position from the original bitstream. The HW decoder will correctly decode to the right line computed from the appropriate top_field_first and is_first_field flags. This patch aligns with DXVA's definition, which is what most HW and drivers expect. In particular, Intel PowerVR (Cedarview et al.) and NVIDIA (through VA-to-VDPAU layer). Since it looks more complex to fix binary drivers, I aligned the Intel Gen driver (Sandy Bridge et al.) to this behaviour, while maintaining compatibility with codec layers not providing this patch yet. Signed-off-by: Gwenole Beauchesne <gwenole.beauchesne@intel.com> Signed-off-by: Martin Storsjö <martin@martin.st>
Libav README ------------ 1) Documentation ---------------- * Read the documentation in the doc/ directory. 2) Licensing ------------ * See the LICENSE file.