[Libva] mpeg4 decoding

[Varga, Michael]

Hello,

I am working to implement VAAPI mpeg4 decoding in MESA. I am currently trying to remedy a scenario where the VideoObjectPlane() (VOP) header is truncated from the input slice data. If the VOP header is truncated I need to regenerate it and add it to the front of the bitstream. It would appear one variable is missing from "VAPictureParameterBufferMPEG4" to generate the VOP header, the variable "modulo_time_base". I have seen a hacky method for generating this variable but I think it would be better to pass it in using the struct "VAPictureParameterBufferMPEG4". Would you be willing to add this variable?
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