[FFmpeg-devel] [PATCH] Fix for Errors decoding TrueHD 7.1 streams (issue1866)

[Nick Brereton]

Hello,

I took a look at issue1866 ( https://roundup.ffmpeg.org/issue1866 -
"Errors decoding TrueHD 7.1 streams") & have attached a patch that fixes
the problem.

The root cause is that the supplied sample has a substream (for the 7.1
case) with a channel range that overlaps the previously decoded
channels. This is a problem as the existing code only allocates 1 set of
channel decoding parameters per channel despite these being also
dependant on the substream number; when lower substreams are decoded
after a restart header has been processed for the higher overlapping
substream the wrong coding parameters are used. I've moved the channel
coding info structures into the substream structure & modified
references accordingly.

Nick

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