We deliberately left `Cea608Decoder` and `Cea708Decoder` intact when
creating the respective `SubtitleParser` implementations (in
27caeb8038
and
94e45eb4ad
respectively).
However we didn't correctly change the behaviour of
`SubtitleDecoderFactory.DEFAULT` in order to use these 'legacy'
implementations. We firstly left the `Cea608Decoder` instantiation
**after** the `DefaultSubtitleParserFactory.supportsFormat()` check,
meaning that code would never be reached (since `supportsFormat` now
returns true for CEA-608). Then in the second change (which was supposed
to only be about CEA-708) we removed all instantiations of **both**
`Cea608Decoder` and `Cea708Decoder`. This change puts the decoder
instantiations back and moves them above the
`DefaultSubtitleParserFactory.supportsFormat` check, meaning they will
be used in preference to `DelegatingSubtitleDecoder`.
This resolves the immediately-disappearing subtitles tracked by
Issue: androidx/media#904.
PiperOrigin-RevId: 592217937
7ca26f898d