static int filter_frame()

in Transform_V1/vf_transform_v1.c [924:984]

• 51 lines of code
• 7 McCabe index (conditional complexity)

static int filter_frame(AVFilterLink *inlink, AVFrame *in)
{
    AVFilterContext *ctx = inlink->dst;
    TransformContext *s = ctx->priv;
    AVFilterLink *outlink = ctx->outputs[0];
    AVFrame *out;
    int subs;
    av_log(ctx, AV_LOG_VERBOSE, "Frame\n");

    // map not yet set
    if (s->out_map_planes != 2) {
        int result = generate_map(s, inlink, outlink, in);
        if (result != 0) {
            av_frame_free(&in);
            return result;
        }
    }

    out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
    av_log(ctx, AV_LOG_VERBOSE, "Got Frame %dx%d\n", outlink->w, outlink->h);

    if (!out) {
        av_frame_free(&in);
        return AVERROR(ENOMEM);
    }
    av_frame_copy_props(out, in);
    av_log(ctx, AV_LOG_VERBOSE, "Copied props \n");
    subs = s->w_subdivisions * s->h_subdivisions;

    for (int plane = 0; plane < s->planes; ++plane) {
        uint8_t *in_data, *out_data;
        int out_map_plane;
        TransformPlaneMap *p;

        in_data = in->data[plane];
        av_assert1(in_data);
        out_map_plane = (plane == 1 || plane == 2) ? 1 : 0;
        p = &s->out_map[out_map_plane];
        out_data = out->data[plane];

        int num_tiles_row = 1 + ((p->h - 1) / 16); // ceiling operation
        int num_tiles_col = 1 + ((p->w - 1) / 16); // ceiling operation
        int num_tiles = num_tiles_row * num_tiles_col;

        ThreadData td;
        td.p = p;
        td.subs = subs;
        td.linesize = out->linesize[plane];
        td.num_tiles = num_tiles;
        td.num_tiles_col = num_tiles_col;
        td.in_data = in_data;
        td.out_data = out_data;
        ctx->internal->execute(ctx, filter_slice, &td, NULL, FFMIN(num_tiles, ctx->graph->nb_threads));
    }

    av_log(ctx, AV_LOG_VERBOSE, "Done with byte copy \n");

    av_frame_free(&in);
    av_log(ctx, AV_LOG_VERBOSE, "Done freeing in \n");
    return ff_filter_frame(outlink, out);
}