static int source_request_frame(AVFilterLink *outlink) { Frei0rContext *frei0r = outlink->src->priv; AVFilterBufferRef *picref = ff_get_video_buffer(outlink, AV_PERM_WRITE, outlink->w, outlink->h); int ret; picref->video->pixel_aspect = (AVRational) {1, 1}; picref->pts = frei0r->pts++; picref->pos = -1; ret = ff_start_frame(outlink, avfilter_ref_buffer(picref, ~0)); if (ret < 0) goto fail; frei0r->update(frei0r->instance, av_rescale_q(picref->pts, frei0r->time_base, (AVRational){1,1000}), NULL, (uint32_t *)picref->data[0]); ret = ff_draw_slice(outlink, 0, outlink->h, 1); if (ret < 0) goto fail; ret = ff_end_frame(outlink); fail: avfilter_unref_buffer(picref); return ret; }