c - FFMPEG how to use functions from libswscale when writing filter for libavfilter -

i trying write filters ffmpeg , use created filters preprocessing planes. how can 1 that? have standard loop plane processing:

int p;     if (av_frame_is_writable(in)) {         out = in;     } else {         out = ff_get_video_buffer(outlink, outlink->w, outlink->h);         if (!out) {             av_frame_free(&in);             return averror(enomem);         }         av_frame_copy_props(out, in);     }     // processing planes     (p = 0; p < filter->nb_planes; p++) {         pad_plane();         transpose_plane(); // etc...           apply_my_filter();               }      if (out != in)         av_frame_free(&in);     return ff_filter_frame(outlink, out); 

i believe padding , transposing possible in ffmpeg's other libraries. common way able use them inside mine filter code?