avfilter: Add command passing support

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

1 files changed, 30 insertions, 0 deletions

diff --git a/libavfilter/avfiltergraph.c b/libavfilter/avfiltergraph.c
index 8756e42bd4..f9ae1cd1ef 100644
--- a/libavfilter/avfiltergraph.c
+++ b/libavfilter/avfiltergraph.c
@@ -253,3 +253,33 @@ int avfilter_graph_config(AVFilterGraph *graphctx, void *log_ctx)
 
     return 0;
 }
+
+int avfilter_graph_send_command(AVFilterGraph *graph, const char *target, const char *cmd, const char *arg, char *res, int res_len, int flags)
+{
+    int i, r = AVERROR(ENOSYS);
+
+    if(!graph)
+        return r;
+
+    if((flags & AVFILTER_CMD_FLAG_ONE) && !(flags & AVFILTER_CMD_FLAG_FAST)) {
+        r=avfilter_graph_send_command(graph, target, cmd, arg, res, res_len, flags | AVFILTER_CMD_FLAG_FAST);
+        if(r != AVERROR(ENOSYS))
+            return r;
+    }
+
+    if(res_len && res)
+        res[0]= 0;
+
+    for (i = 0; i < graph->filter_count; i++) {
+        AVFilterContext *filter = graph->filters[i];
+        if(!strcmp(target, "all") || !strcmp(target, filter->name) || !strcmp(target, filter->filter->name)){
+            r = avfilter_process_command(filter, cmd, arg, res, res_len, flags);
+            if(r != AVERROR(ENOSYS)) {
+                if((flags & AVFILTER_CMD_FLAG_ONE) || r<0)
+                    return r;
+            }
+        }
+    }
+
+    return r;
+}