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42b4defb5c
Up to now, tttocea608 supported text/utf8, and no interface to control the positioning of closed captions apart from new lines in the input text. CEA 608 supports a larger set of features than that, such as positioning CC precisely in its 32 x 15 grid, styling text, switching from one mode to another, resetting the base row in roll-up mode etc .. A custom, JSON-based format is now supported by the element (caps application/x-json, format=cea608), allowing users to control those features in a pretty advanced manner. A side effect of this is that the approach previously used by the element to ensure frame-accurate CC display is now untenable: where we knew before that an input buffer would at most span 74 buffers and calculate a somewhat reasonable latency based on that, this is no longer possible. Instead we pick the approach most CC encoders seem to pick, and accept a certain latency at display time: for example the flipping of the back buffer to the display buffer for a 10-character text buffer will occur 7 frames after its PTS. This has obvious benefits in terms of code complexity and should generally be acceptable. + Removes a now irrelevant test, updates other tests + Extracts the Mode enum to the root of the crate, it will be used by another element in a follow-up commit |
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