avfilter/vf_pseudocolor: add support for commands

libavfilter/vf_pseudocolor.c

@@ -127,7 +127,7 @@ typedef struct PseudoColorContext {
 } PseudoColorContext;
 
 #define OFFSET(x) offsetof(PseudoColorContext, x)
-#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
+#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
 
 static const AVOption pseudocolor_options[] = {
     { "c0", "set component #0 expression", OFFSET(comp_expr_str[0]), AV_OPT_TYPE_STRING, {.str="val"},   .flags = FLAGS },
@@ -720,6 +720,17 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
     return ff_filter_frame(outlink, out);
 }
 
+static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
+                           char *res, int res_len, int flags)
+{
+    int ret = ff_filter_process_command(ctx, cmd, args, res, res_len, flags);
+
+    if (ret < 0)
+        return ret;
+
+    return config_input(ctx->inputs[0]);
+}
+
 static const AVFilterPad inputs[] = {
     {
         .name         = "default",
@@ -761,4 +772,5 @@ AVFilter ff_vf_pseudocolor = {
     .inputs        = inputs,
     .outputs       = outputs,
     .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
+    .process_command = process_command,
 };