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Clarify the usage of flag VA_PROC_PIPELINE_FAST. #740

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FurongZhang
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va/va_vpp.h Show resolved Hide resolved
* Regarding the usage of this flag, there are some filter properties in vaapi such as
* VA_FILTER_SCALING_XXX, when VA_PROC_PIPELINE_FAST is combined with these properties,
* the backend implementation should honor VA_PROC_PIPELINE_FAST which means this flag
* could change the filter properties implicitly for better performance.
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Does it mean VA_FILTER_SCALING_XXX won't take effects if VA_PROC_PIPELINE_FAST is set ? How does a user know VA_PROC_PIPELINE_FAST should be set or not ?

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if VA_PROC_PIPELINE_FAST is set, VA_FILTER_SCALING_XXX will not take effect. If the user wants to get better performance, VA_PROC_PIPELINE_FAST should be set.

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