Function preinit

libavfilter/vf_scale.c:310–324

}

static av_cold int preinit(AVFilterContext *ctx)
{
    ScaleContext *scale = ctx->priv;

    scale->sws = sws_alloc_context();
    if (!scale->sws)
        return AVERROR(ENOMEM);

    // set threads=0, so we can later check whether the user modified it
    scale->sws->threads = 0;

    ff_framesync_preinit(&scale->fs);

    return 0;
}

static int do_scale(FFFrameSync *fs);