@@ -207,6 +207,38 @@ static int request_frame(AVFilterLink *outlink)

     return ret;

 }

+static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,

+                           char *res, int res_len, int flags)

+{

+    RubberBandContext *s = ctx->priv;

+

+    if (!strcmp(cmd, "tempo")) {

+        double arg;

+

+        sscanf(args, "%lf", &arg);

+        if (arg < 0.01 || arg > 100) {

+            av_log(ctx, AV_LOG_ERROR,

+                   "Tempo scale factor '%f' out of range\n", arg);

+            return AVERROR(EINVAL);

+        }

+        rubberband_set_time_ratio(s->rbs, 1. / arg);

+    }

+

+    if (!strcmp(cmd, "pitch")) {

+        double arg;

+

+        sscanf(args, "%lf", &arg);

+        if (arg < 0.01 || arg > 100) {

+            av_log(ctx, AV_LOG_ERROR,

+                   "Pitch scale factor '%f' out of range\n", arg);

+            return AVERROR(EINVAL);

+        }

+        rubberband_set_pitch_scale(s->rbs, arg);

+    }

+

+    return 0;

+}

+

 static const AVFilterPad rubberband_inputs[] = {

     {

         .name          = "default",

@@ -235,4 +267,5 @@ AVFilter ff_af_rubberband = {

     .uninit        = uninit,

     .inputs        = rubberband_inputs,

     .outputs       = rubberband_outputs,

+    .process_command = process_command,

 };