Le samedi 25 juillet 2020 à 22:30 +0900, Alexandre Courbot a écrit : > On Thu, Jul 16, 2020 at 5:23 AM Ezequiel Garcia <ezequiel@xxxxxxxxxxxxx> wrote: > > The prediction weight parameters are only required under > > certain conditions, which depend on slice header parameters. > > > > The slice header syntax specifies that the prediction > > weight table is present if: > > > > ((weighted_pred_flag && (slice_type == P || slice_type == SP)) || \ > > (weighted_bipred_idc == 1 && slice_type == B)) > > This is a pretty important bit - how about mentioning in the documentation when > this new control is expected to be present, so both drivers and > userspace submit it > or omit it in a consistent manner? This is copy paste from the spec. We can add a reference to the syntax chapter in the spec that express exactly this if condition (syntax is express in pseudo code). The bitstream works exactly the same. Note that it's not a fault to provide the control even if not needed, drivers will kindly ignore it. Reference: 7.3.3 Slice header syntax Nicolas
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