audio: refine multi-slot WOV detector linkage and trigger stability

- Retrieve exact downstream WOV detector via comp_buffer_get_sink_component(sink)
  in kpb_copy().
- Broadcast RESUME on wov_arbiter prepare so all detector slots start active.
- Map IPC4 pipeline IDs 101/102/103 to slot IDs 0/1/2 in detect_test.
- Require 30ms sustained frequency match (consec_match_count >= 3) and energy > 500
  to filter out ambient room noise transients.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: lrgirdwo

src/audio/kpb.c

@@ -1375,14 +1375,13 @@ static int kpb_copy(struct comp_dev *dev)
 		else
 			comp_update_buffer_produce(sink, produced_bytes);
 
-		uint32_t ppl_id = dev->pipeline ? dev->pipeline->pipeline_id : (dev_comp_id(dev) >> 16);
-		struct comp_dev *wov_comp = get_wov_detector_comp(ppl_id);
+		struct comp_dev *wov_comp = sink ? comp_buffer_get_sink_component(sink) : NULL;
 		if (wov_comp) {
 			comp_err(dev, "kpb_copy: produced=%u bytes, triggering wov=0x%x",
 				 copy_bytes, dev_comp_id(wov_comp));
 			comp_copy(wov_comp);
 		} else {
-			comp_err(dev, "kpb_copy: get_wov_detector_comp(%u) returned NULL!", ppl_id);
+			comp_err(dev, "kpb_copy: downstream sink_comp returned NULL!");
 		}
 
 		comp_update_buffer_consume(source, copy_bytes);

src/audio/wov_arbiter/wov_arbiter.c

@@ -214,6 +214,8 @@ static int wov_arb_prepare(struct comp_dev *dev)
 		cd->detect_uuid_id = AMS_INVALID_MSG_TYPE;
 		return ret;
 	}
+	/* Broadcast RESUME so all WOV detector slots start unpaused */
+	arb_send_ctrl(dev, WOV_CTRL_CMD_RESUME, WOV_ARB_NO_ACTIVE);
 #endif
 
 	return comp_set_state(dev, COMP_TRIGGER_PREPARE);

src/samples/audio/detect_test.c

@@ -66,11 +66,11 @@
 #define KWD_NN_BUFF_ALIGN	64
 
 static const struct comp_driver comp_keyword;
-static struct comp_dev *wov_detect_devs[16];
+static struct comp_dev *wov_detect_devs[256];
 
 struct comp_dev *get_wov_detector_comp(uint32_t ppl_id)
 {
-	if (ppl_id < 16)
+	if (ppl_id < 256)
 		return wov_detect_devs[ppl_id];
 	return NULL;
 }
@@ -102,6 +102,7 @@ struct comp_data {
 	int32_t prev_sample;
 	uint32_t zc_count;
 	uint32_t zc_sample_count;
+	uint32_t consec_match_count;
 
 #if CONFIG_KWD_NN_SAMPLE_KEYPHRASE
 	int16_t *input;
@@ -371,13 +372,19 @@ static void default_detect_test(struct comp_dev *dev,
 				break;
 			}
 
+			if (freq_match) {
+				cd->consec_match_count++;
+			} else {
+				cd->consec_match_count = 0;
+			}
+
 			if (freq_hz > 0) {
-				comp_err(dev, "kd_test eval: slot=%u (%s), freq=%u Hz, energy=%d, preamble=%u",
-					 slot_id, voice_type, freq_hz, cd->activation, cd->detect_preamble);
+				comp_err(dev, "kd_test eval: slot=%u (%s), freq=%u Hz, energy=%d, match_cnt=%u",
+					 slot_id, voice_type, freq_hz, cd->activation, cd->consec_match_count);
 			}
 
 			if (cd->detect_preamble >= cd->keyphrase_samples) {
-				if (freq_match && (cd->activation >= activation_threshold || cd->activation > 10)) {
+				if (cd->consec_match_count >= 3 && (cd->activation >= activation_threshold || cd->activation > 500)) {
 					comp_err(dev, "kd_test: SLOT %u TRIGGERED on %s Voice! (freq=%u Hz, energy=%d)",
 						 slot_id, voice_type, freq_hz, cd->activation);
 					cd->drain_req = 0;
@@ -873,7 +880,7 @@ static struct comp_dev *test_keyword_new(const struct comp_driver *drv,
 
 	comp_err(dev, "test_keyword_new: dev_id=0x%x pipeline_id=%u",
 		 dev_comp_id(dev), dev->ipc_config.pipeline_id);
-	if (dev->ipc_config.pipeline_id < 16) {
+	if (dev->ipc_config.pipeline_id < 256) {
 		wov_detect_devs[dev->ipc_config.pipeline_id] = dev;
 	}
 
@@ -1003,11 +1010,12 @@ static int test_keyword_params(struct comp_dev *dev,
 	cd->kpd_uuid_id          = AMS_INVALID_MSG_TYPE;
 	cd->wov_detect_uuid_id   = AMS_INVALID_MSG_TYPE;
 	cd->wov_ctrl_uuid_id     = AMS_INVALID_MSG_TYPE;
-	if (dev->ipc_config.pipeline_id == 1)
+	uint32_t ppl_id = dev->ipc_config.pipeline_id;
+	if (ppl_id == 101 || ppl_id == 1)
 		cd->wov_slot_id = 0;
-	else if (dev->ipc_config.pipeline_id == 3)
+	else if (ppl_id == 102 || ppl_id == 3)
 		cd->wov_slot_id = 1;
-	else if (dev->ipc_config.pipeline_id == 4)
+	else if (ppl_id == 103 || ppl_id == 4)
 		cd->wov_slot_id = 2;
 	else
 		cd->wov_slot_id = WOV_SLOT_INVALID;