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a84fe06112
Not every user of idctdsp.h wants to initialize an IDCTDSPContext; e.g. the proresdsp only uses ff_init_scantable_permutation() and the IDCT permutation enum; similarly for cavsdsp and wmv2dsp. Using a forward declaration here avoids an avcodec.h dependency in the relevant files. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>