vp4: prevent unaligned memory access in loop filter
VP4 applies a loop filter during motion compensation, causing the block offset will often by unaligned. This produces a bus error on some platforms, namely ARMv7 NEON. This patch adds a unaligned version of the loop filter function pointer to VP3DSPContext. Reported-by: NMike Melanson <mike@multimedia.cx> Signed-off-by: NMichael Niedermayer <michael@niedermayer.cc>
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