static void copy_picture_field(InterlaceContext *s, AVFrame *src_frame, AVFrame *dst_frame, AVFilterLink *inlink, enum FieldType field_type, int lowpass) { const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format); int hsub = desc->log2_chroma_w; int vsub = desc->log2_chroma_h; int plane, j; for (plane = 0; plane < desc->nb_components; plane++) { int cols = (plane == 1 || plane == 2) ? -(-inlink->w) >> hsub : inlink->w; int lines = (plane == 1 || plane == 2) ? -(-inlink->h) >> vsub : inlink->h; uint8_t *dstp = dst_frame->data[plane]; const uint8_t *srcp = src_frame->data[plane]; av_assert0(cols >= 0 || lines >= 0); lines = (lines + (field_type == FIELD_UPPER)) / 2; if (field_type == FIELD_LOWER) srcp += src_frame->linesize[plane]; if (field_type == FIELD_LOWER) dstp += dst_frame->linesize[plane]; if (lowpass) { int srcp_linesize = src_frame->linesize[plane] * 2; int dstp_linesize = dst_frame->linesize[plane] * 2; for (j = lines; j > 0; j--) { const uint8_t *srcp_above = srcp - src_frame->linesize[plane]; const uint8_t *srcp_below = srcp + src_frame->linesize[plane]; if (j == lines) srcp_above = srcp; // there is no line above if (j == 1) srcp_below = srcp; // there is no line below s->lowpass_line(dstp, cols, srcp, srcp_above, srcp_below); dstp += dstp_linesize; srcp += srcp_linesize; } } else { av_image_copy_plane(dstp, dst_frame->linesize[plane] * 2, srcp, src_frame->linesize[plane] * 2, cols, lines); } } }