Note: DPB is sampled and updated at Tr(n) times, sampling at another times is pointless.
For each arriving frame #N Do
//******* marking process – to mark frame(s) “unused for reference” ************
If the decoded frame is IDR then mark all frames in DPB as unused-for-reference
{
if no_output_of_prior_pics_flag (signaled only with IDR slice header) is equal to 1 then the whole DPB is emptied (all frames are removed).
// Of course, for the very first IDR the flag no_output_of_prior_pics_flag has no effect.
}
else // non-idr
{
if memory_management_control_operation present in the slice header of the current picture and equal to memory_management_control_operation=5 then
{
all frames in DPB marked as unused-for-reference and removed // in such case current frame must be non-IDR I-picture
}
else
{
loop over frames in DPB and mark frame(s) as unused-for-reference (according to sliding windows or memory_management_control_operation)
}
}
//****** Storing process *******
1) When the current picture #N is specified as “unused-for-reference” (i.e. ref_idc=0 in NAL header) and Tdpb(N) > Tr(N), the current picture #N is stored in DPB (and to be removed lately).
otherwise the current frame is removed ( see the Removal Process section below)
2) When the current picture #N is specified as “reference picture” (i.e. ref_idc!=0), it’s stored in DPB regardless Tdpb(N).
//**** Removal process *********
Loop over all frames in DPB
if k-th frame in DBP is marked as “unused-for-reference” and Tdpb(k) <= Tr(N) then remove the k-th frame from DPB
23+ years’ programming and theoretical experience in the computer science fields such as video compression, media streaming and artificial intelligence (co-author of several papers and patents).
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