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improve documentation for dmabuf negotiation

columbarius requested to merge columbarius/pipewire:doc-dmabuf into master

Adding

  • more details on how the negotiation process works (with a TBD for client side modifier fixation),
  • a paragraph on why mmapping DMA-BUFs can be problematic,
  • a paragraph about how DMA-BUFs with v4l2 context can be handled.

Open for discussion:

  • Modifierless fastpath for producers, announcing DRM_FORMAT_MOD_INVALID without SPA_POD_PROP_FLAG_DONT_FIXATE
Edited by columbarius

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