Three defects in the carrier path, two of them found on hardware (#1804).
Falling through to the normal sink when the carrier was unavailable handed
TrueHD straight back to media3's raw ENCODING_DOLBY_TRUEHD path — the exact
configuration this issue is about. TrueHD is now binary: the carrier, or
reported unsupported so the bundled FFmpeg decoder takes it. media3's raw path
has no demonstrated working case here and two broken ones, and even Kodi's raw
fallback is a different thing, offered only after verifying at 192kHz.
The 44.1kHz family was decided from a packer flag that is only set once a major
sync has been parsed, long after selection. The carrier was therefore chosen for
those streams and then packed nothing, which is silence rather than a glitch. It
is decided from Format.sampleRate now, with the packer flag left as a loud
runtime backstop for a bitstream that disagrees with its container.
handleBuffer consumed the whole input buffer even when a burst was refused
part-way through, dropping every access unit behind it — a media3 sample holds
sixteen. The buffer position now advances per unit and the method returns false
with the remainder intact, which is media3's own retry contract. A test rejects
a burst mid-sample and asserts the carrier output is still byte-identical.
The capability gate also needed tightening. getMinBufferSize answers yes for the
192kHz/7.1 IEC tuple on a Shield and the AudioTrack then fails to initialise: it
reports that a buffer can be sized, not that the route will carry the format.
Without getDirectPlaybackSupport there is no way to separate the two, so the
carrier is not offered below API 33 and TrueHD decodes exactly as before.
Verified on both connected boxes. SEI Box R (Android 14): carrier selected,
AudioTrack built as IEC61937 at 192kHz/7.1, no decoder instantiated, clock
tracks wall time. Nvidia Shield (Android 11): carrier declined, FFmpeg decoder
selected, identical to its behaviour before this work.
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