aacpsy: Add energy spread for each band
This commit adds the energy spread to the struct for each band and removes 2 unused fields. distortion and perceptual_weight were not referenced in any file nor were they set to any value, so it was safe to remove them. The energy spread is currently only used in the aac psy model. It's defined as being proportional to the tonality of each band. Reviewed-by: NClaudio Freire <klaussfreire@gmail.com> Signed-off-by: NMichael Niedermayer <michaelni@gmx.at>
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