[vlc-devel] [RFC PATCH 1/5] filter: add a way to signal error from callbacks

[Rémi Denis-Courmont]

Hi,

I do not know why a separate block is needed as opposed to flagging a discontinuity on the following successfully output block.

But assuming that you have a good reason in mind, there are still some challenges with the error block approach:
- If it needs to be queued, it needs to be writable, and thus it needs to be allocated, and thus its allocation can fail.
- There are code paths that discards zero-size blocks specially, or fails to handle them at all.
- Some craptastic platforms might not support exported globals, only functions (not that I'd care personally).
-- 
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