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Each ChannelElement contains exactly one SpectralBandReplication structure; the latter structure contains lots of buffers whose size depend upon USE_FIXED (i.e. AAC_FLOAT arrays). This complicates deduplicating the parts of the AAC decoder that are duplicated between the fixed-point and the floating point decoder. In order to fix this, the SpectralBandReplication structure will be moved from the part of ChannelElement visible to the common code. Therefore the ff_aac_sbr_* functions are ported to accept a ChannelElement*; they will then have to translate that to the corresponding SpectralBandReplication* themselves (which is possible, because there are floating-point and fixed-point versions of these functions). While just at it, also ensure that these functions are properly namespaced. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>