avfilter/edgedetect: make processing functions context free.
avfilter/edgedetect: add a colormix mode.
avfilter/edgedetect: reindent after previous commit.
avfilter/edgedetect: update copyright.
avcodec/ffv1dec: use av_malloc_array()

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avcdoec/snowenc: use av_mallocz_array()

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avfilter/audio: use av_mallocz_array()

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>