+static int graph_load_from_desc(AVFilterContext *ctx, AVFilterGraphDesc *desc)
+{
+ AVFilterGraphDescFilter *curfilt;
+ AVFilterGraphDescLink *curlink;
+ AVFilterGraphDescExport *curpad;
+ AVFilterContext *filt, *filtb;
+
+ /* create all filters */
+ for(curfilt = desc->filters; curfilt; curfilt = curfilt->next) {
+ if(!(filt = avfilter_create_by_name(curfilt->filter, curfilt->name))) {
+ av_log(ctx, AV_LOG_ERROR, "error creating filter\n");
+ goto fail;
+ }
+ avfilter_graph_add_filter(ctx, filt);
+ if(avfilter_init_filter(filt, curfilt->args, NULL)) {
+ av_log(ctx, AV_LOG_ERROR, "error initializing filter\n");
+ goto fail;
+ }
+ }
+
+ /* create all links */
+ for(curlink = desc->links; curlink; curlink = curlink->next) {
+ if(!(filt = avfilter_graph_get_filter(ctx, curlink->src))) {
+ av_log(ctx, AV_LOG_ERROR, "link source does not exist in graph\n");
+ goto fail;
+ }
+ if(!(filtb = avfilter_graph_get_filter(ctx, curlink->dst))) {
+ av_log(ctx, AV_LOG_ERROR, "link destination does not exist in graph\n");
+ goto fail;
+ }
+ if(avfilter_link(filt, curlink->srcpad, filtb, curlink->dstpad)) {
+ av_log(ctx, AV_LOG_ERROR, "cannot create link between source and destination filters\n");
+ goto fail;
+ }
+ }
+
+ /* export all input pads */
+ for(curpad = desc->inputs; curpad; curpad = curpad->next) {
+ if(!(filt = avfilter_graph_get_filter(ctx, curpad->filter))) {
+ av_log(ctx, AV_LOG_ERROR, "filter owning exported pad does not exist\n");
+ goto fail;
+ }
+ add_graph_input(ctx, filt, curpad->pad, curpad->name);
+ }
+
+ /* export all output pads */
+ for(curpad = desc->outputs; curpad; curpad = curpad->next) {
+ if(!(filt = avfilter_graph_get_filter(ctx, curpad->filter))) {
+ av_log(ctx, AV_LOG_ERROR, "filter owning exported pad does not exist\n");
+ goto fail;
+ }
+ add_graph_output(ctx, filt, curpad->pad, curpad->name);
+ }
+
+ return 0;
+
+fail:
+ uninit(ctx);
+ return -1;
+}
+
+static int init_desc(AVFilterContext *ctx, const char *args, void *opaque)
+{
+ GraphContext *gctx = ctx->priv;
+
+ if(!opaque)
+ return -1;
+
+ if(!(gctx->link_filter = avfilter_create(&vf_graph_dummy, NULL)))
+ return -1;
+ if(avfilter_init_filter(gctx->link_filter, NULL, ctx))
+ goto fail;
+
+ return graph_load_from_desc(ctx, opaque);
+
+fail:
+ avfilter_destroy(gctx->link_filter);
+ return -1;
+}
+
+AVFilter vf_graphdesc =
+{
+ .name = "graph_desc",
+ .author = "Bobby Bingham",
+
+ .priv_size = sizeof(GraphContext),
+
+ .init = init_desc,
+ .uninit = uninit,
+
+ .inputs = (AVFilterPad[]) {{ .name = NULL, }},
+ .outputs = (AVFilterPad[]) {{ .name = NULL, }},
+};
+
+static int init_file(AVFilterContext *ctx, const char *args, void *opaque)
+{
+ AVFilterGraphDesc *desc;
+ int ret;
+
+ if(!args)
+ return -1;
+ if(!(desc = avfilter_graph_load_desc(args)))
+ return -1;
+
+ ret = init_desc(ctx, NULL, desc);
+ avfilter_graph_free_desc(desc);
+ return ret;
+}
+
+AVFilter vf_graphfile =
+{
+ .name = "graph_file",
+ .author = "Bobby Bingham",
+
+ .priv_size = sizeof(GraphContext),
+
+ .init = init_file,
+ .uninit = uninit,
+
+ .inputs = (AVFilterPad[]) {{ .name = NULL, }},
+ .outputs = (AVFilterPad[]) {{ .name = NULL, }},
+};
+