Fire TV Stick 4K Max (and other Fire OS devices) advertise ENCODING_DTS_HD on
the HDMI route but only implement the DTS-HD basic profile, so media3's raw
path builds an AudioTrack that drains normally while the receiver hears
silence. The same routes do bitstream the 192kHz/7.1 ENCODING_IEC61937 carrier
TrueHD already rides, so DTS-HD MA access units are now packed into DTS type IV
bursts (a port of FFmpeg's spdif_header_dts4 at the 768kHz HD rate, the same
bytes Kodi's IEC packer produces) and played through that carrier.
The TrueHD MAT carrier sink is generalized into IecCarrierSink with one
IecCarrierPacker per codec. While the carrier route exists DTS-HD is binary -
the carrier or decoded PCM, never the lying raw path; routes without the
carrier keep the pre-carrier raw behavior. Master Audio peaks the carrier
cannot hold strip to the always-fitting core substream for ~60s, exactly as
FFmpeg does, and the packer output is pinned byte-for-byte against FFmpeg
spdif golden fixtures.
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