From a918b833a5ea640b6c8fa1125ae420999055b753 Mon Sep 17 00:00:00 2001
From: Paul B Mahol <onemda@gmail.com>
Date: Tue, 8 Oct 2019 12:42:40 +0200
Subject: [PATCH] avfilter/avfilter: add ff_filter_process_command()

---
 libavfilter/avfilter.c | 13 +++++++++++++
 libavfilter/internal.h |  7 +++++++
 2 files changed, 20 insertions(+)

diff --git a/libavfilter/avfilter.c b/libavfilter/avfilter.c
index 93e866b79c..09f33e0e7c 100644
--- a/libavfilter/avfilter.c
+++ b/libavfilter/avfilter.c
@@ -884,6 +884,19 @@ static int process_options(AVFilterContext *ctx, AVDictionary **options,
     return count;
 }
 
+int ff_filter_process_command(AVFilterContext *ctx, const char *cmd,
+                              const char *arg, char *res, int res_len, int flags)
+{
+    const AVOption *o;
+
+    if (!ctx->filter->priv_class)
+        return 0;
+    o = av_opt_find2(ctx->priv, cmd, NULL, AV_OPT_FLAG_RUNTIME_PARAM | AV_OPT_FLAG_FILTERING_PARAM, AV_OPT_SEARCH_CHILDREN, NULL);
+    if (!o)
+        return AVERROR(ENOSYS);
+    return av_opt_set(ctx->priv, cmd, arg, 0);
+}
+
 int avfilter_init_dict(AVFilterContext *ctx, AVDictionary **options)
 {
     int ret = 0;
diff --git a/libavfilter/internal.h b/libavfilter/internal.h
index 498bd3328d..1d77808082 100644
--- a/libavfilter/internal.h
+++ b/libavfilter/internal.h
@@ -411,6 +411,13 @@ static inline int ff_norm_qscale(int qscale, int type)
  */
 int ff_filter_get_nb_threads(AVFilterContext *ctx);
 
+/**
+ * Generic processing of user supplied commands that are set
+ * in the same way as the filter options.
+ */
+int ff_filter_process_command(AVFilterContext *ctx, const char *cmd,
+                              const char *arg, char *res, int res_len, int flags);
+
 /**
  * Perform any additional setup required for hardware frames.
  *