audio: kpb: Discard input data if kd isn't active

Until the pipeline containing the kd module is started, discard incoming
samples to avoid overrun on dai and not to pass a signal containing
a glitch to kd. The kd module is placed on a separate pipeline, which can
be started after the pipeline containing pkb.

Signed-off-by: Adrian Warecki <adrian.warecki@intel.com>

Author: softwarecki

src/audio/kpb.c

@@ -1215,6 +1215,14 @@ static int kpb_copy(struct comp_dev *dev)
 			break;
 		}
 
+		/* Discard data if sink is not active */
+		if (comp_buffer_get_sink_component(sink)->state != COMP_STATE_ACTIVE) {
+			copy_bytes = audio_stream_get_avail_bytes(&source->stream);
+			comp_update_buffer_consume(source, copy_bytes);
+			comp_dbg(dev, "KD not active, skipping %zu bytes...", copy_bytes);
+			break;
+		}
+
 		/* Validate sink */
 		if (!audio_stream_get_wptr(&sink->stream)) {
 			comp_err(dev, "invalid selector sink pointers.");