[Bug 697111] [typefind/dcaparse] fix DTS frame size for 14-bits packed streams

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=697111
  GStreamer | gst-plugins-base | 1.x

--- Comment #5 from Arnaud Vrac <rawoul at gmail.com> 2013-04-03 09:22:48 UTC ---
>From the DTS spec:

"In order to diminish the noise output level resulting when the DTS bitstream
is mistakenly played back as PCM format, the DTS bitstream is stored only in
the least significant 14 bits of the 16-bit word available for compressed audio
in an IEC sub-frame. The most significant 2 bits are not used. In this case,
SYNC is stored in three words: 0x1fff, 0xe800, and 0x07f."

So that means the frame size does not change when switching to 14-bits packing,
since the 2 bits left are just unused, not removed.

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