@end example
@end itemize
+@subsection Commands
+
+This filter supports the following commands:
+@table @option
+@item cN
+Modify the @var{N}-th control value.
+
+If the specified value is not valid, it is ignored and prior one is kept.
+@end table
+
@section lowpass
Apply a low-pass filter with 3dB point frequency.
av_freep(&ctx->input_pads[0].name);
}
+static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
+ char *res, int res_len, int flags)
+{
+ LADSPA_Data value;
+ unsigned long port;
+
+ if (sscanf(cmd, "c%ld", &port) + sscanf(args, "%f", &value) != 2)
+ return AVERROR(EINVAL);
+
+ return set_control(ctx, port, value);
+}
+
static const AVFilterPad ladspa_outputs[] = {
{
.name = "default",
.init = init,
.uninit = uninit,
.query_formats = query_formats,
+ .process_command = process_command,
.inputs = 0,
.outputs = ladspa_outputs,
.flags = AVFILTER_FLAG_DYNAMIC_INPUTS,