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video: Add new text layout API, baseclass, and elements

Seungha Yang requested to merge seungha.yang/gstreamer:video-subtitle into main
  • Adding GstTextLayout and GstVideoSubtitleMeta for subtitle information (e.g., string, text layout, attributes) signalling
  • Add subtitlemux element to aggregate subtitle and attach GstVideoSubtitleMeta to output video buffers
  • New baseclasses for textlayout rendering
  • Update dwrite plugin to use new baseclass/API
  • Add pango2 plugin based on new baseclass/API
Edited by Seungha Yang

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