avfilter: Add command passing support

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

1 files changed, 12 insertions, 0 deletions

diff --git a/libavfilter/avfilter.c b/libavfilter/avfilter.c
index 23bb26cccc..2922138808 100644
--- a/libavfilter/avfilter.c
+++ b/libavfilter/avfilter.c
@@ -26,6 +26,7 @@
 #include "libavutil/audioconvert.h"
 #include "libavutil/imgutils.h"
 #include "libavutil/avassert.h"
+#include "libavutil/avstring.h"
 #include "avfilter.h"
 #include "internal.h"
 
@@ -616,6 +617,17 @@ void avfilter_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
     draw_slice(link, y, h, slice_dir);
 }
 
+int avfilter_process_command(AVFilterContext *filter, const char *cmd, const char *arg, char *res, int res_len, int flags)
+{
+    if(!strcmp(cmd, "ping")){
+        av_strlcatf(res, res_len, "pong from:%s %s\n", filter->filter->name, filter->name);
+        return 0;
+    }else if(filter->filter->process_command) {
+        return filter->filter->process_command(filter, cmd, arg, res, res_len, flags);
+    }
+    return AVERROR(ENOSYS);
+}
+
 void avfilter_filter_samples(AVFilterLink *link, AVFilterBufferRef *samplesref)
 {
     void (*filter_samples)(AVFilterLink *, AVFilterBufferRef *);