replaygain: allow exporting already decoded replaygain values
This adds a function to export raw replaygain values (i.e. in the (u)int32_t
form). It first checks whether AV_PKT_DATA_REPLAYGAIN side data is present, in
which case it does nothing.
Signed-off-by:
Anton Khirnov <anton@khirnov.net>
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