dvbsubenc: Add DVB Subtitle encoder

Add an element that converts AYUV video frames to a DVB subpicture stream.

It's fairly simple for now. Later it would be good to support input via a stream that contains only GstVideoOverlayComposition meta.

The element searches each input video frame for the largest sub-region containing non-transparent pixels and encodes that as a single DVB subpicture region. It can also do palette reduction of the input frames using code taken from libimagequant.

There are various FIXME for potential improvements for now, but it works.

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• 7c46187d - dvbsubenc: Fix C90 warnings in SSE code

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• bf50054a - dvbsubenc: Fix old-stype function definition warning

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• f35c0c89 - dvbsubenc: Use g_alloca in libimagequant

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This passes CI except for something weird going on with gst-indent for some reason. I can't get gst-indent to want to make the same change here (with the same version of indent), and if I make the change locally, then gst-indent will revert it.

Also, sometimes retrying the CI has made the task pass - so this might be a new non-idempotency issue for some reason.

I might just wrap that section in an indent-off section, or I suspect it'll cause repeated problems down the road.

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• f97ef445 - dvbsubenc: Wrap a small piece in INDENT-OFF

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assigned to @gstreamer-merge-bot

mentioned in commit thaytan/gst-plugins-bad@6e9d5d90

mentioned in commit thaytan/gst-plugins-bad@6f0d966f

mentioned in commit thaytan/gst-plugins-bad@9f5d3e24

mentioned in commit thaytan/gst-plugins-bad@e6de5333

mentioned in commit thaytan/gst-plugins-bad@952ff1cb

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• 9f5d3e24 - dvbsubenc: Add DVB Subtitle encoder
• 6f0d966f - dvbsubenc: Fix C90 warnings in SSE code
• 6e9d5d90 - dvbsubenc: Fix old-stype function definition warning
• e6de5333 - dvbsubenc: Use g_alloca in libimagequant
• 952ff1cb - dvbsubenc: Wrap a small piece in INDENT-OFF

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

added 1 commit

• 26bc4ba5 - dvbsubenc: Add DVB Subtitle encoder

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I couldn't merge this branch: Someone canceled the CI.

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

mentioned in commit thaytan/gst-plugins-bad@1cf3cae5

added 1 commit

• 1cf3cae5 - dvbsubenc: Add DVB Subtitle encoder

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merged

changed milestone to %1.17.1