codecs: h264decoder: set latency

Add gst_h264_decoder_set_latency(), which calculates and sets latency on base decoder class, after new_sequence is called.

This assumes that in new_sequence() vmethod, callee negotiates downstream caps.

@seungha.yang, @ndufresne: should this method be a virtual method with this implementation as default?

I feel we don't need subclass specific vfunc at this moment :P We can add it when it's really required.

added 27 commits

• 7f6dd2a6...64039cdf - 25 commits from branch gstreamer:master
• 340e98f8 - Revert "va: h264dec: set latency"
• eb56a4d8 - codecs: h264decoder: Calculate and set latency

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added 4 commits

• eb56a4d8...7cb583bb - 2 commits from branch gstreamer:master
• ad9a4354 - Revert "va: h264dec: set latency"
• b2986fe0 - codecs: h264decoder: Calculate and set latency

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added 25 commits

• b2986fe0...52ef1925 - 23 commits from branch gstreamer:master
• a8fd060e - Revert "va: h264dec: set latency"
• 7d7bcdec - codecs: h264decoder: Calculate and set latency

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resolved all threads

If no other comments I'll commit it along my afternoon :)

Looks good to me now.

assigned to @gstreamer-merge-bot

mentioned in commit vjaquez/gst-plugins-bad@b9510048

mentioned in commit vjaquez/gst-plugins-bad@4cb4539f

added 6 commits

• 7d7bcdec...c6ae415c - 4 commits from branch gstreamer:master
• 4cb4539f - Revert "va: h264dec: set latency"
• b9510048 - codecs: h264decoder: Calculate and set latency

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assigned to @vjaquez and unassigned @gstreamer-merge-bot

I couldn't merge this branch: CI failed!

mentioned in commit vjaquez/gst-plugins-bad@b1870931

mentioned in commit vjaquez/gst-plugins-bad@261d6e46

added 3 commits

• e4732fbb - 1 commit from branch gstreamer:master
• 261d6e46 - Revert "va: h264dec: set latency"
• b1870931 - codecs: h264decoder: Calculate and set latency

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