[mythtv-commits] Ticket #9772: EIA-608 closed caption colors

[MythTV]

#9772: EIA-608 closed caption colors
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 Reporter:  Jim Stichnoth <stichnot@…>          |           Type:  Patch -
   Status:  new                                 |  Feature
Milestone:  unknown                             |       Priority:  minor
  Version:  Trunk Head                          |      Component:  MythTV -
 Keywords:                                      |  General
                                                |       Severity:  medium
                                                |  Ticket locked:  0
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 This patch adds support for colors, italics, and underlining to EIA-608
 closed captions.  (Sorry to say that I didn't add flashing support...)

 Currently only intra-line formatting is supported, and not formatting
 associated with preamble address codes, as I haven't seen any examples of
 the latter in my testing.

 In an ideal implementation, each character would be decorated with
 color/italic/underline attributes which would be extracted by the caption
 renderer.  However, this approach looked like it would involve fairly
 major changes, so I took a different approach.  Formatting commands are
 embedded into the caption string as two-character control sequences like
 "%a", "%b", etc. for the renderer to decode.  This works well in practice,
 but might cause anomalies with backspacing and direct addressing via
 preamble address codes.

 See also [85a5266e1].

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Ticket URL: <http://code.mythtv.org/trac/ticket/9772>
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