From 37efd5c5f95e7dc066462d297947b06587ffbdde Mon Sep 17 00:00:00 2001
From: Nils Tonnaett <ntonnatt@ccrma.stanford.edu>
Date: Tue, 21 Apr 2026 17:13:44 -0700
Subject: [PATCH] module-avb: emit gm_changed event

---
 src/modules/module-avb/gptp.c     | 7 +++++++
 src/modules/module-avb/internal.h | 2 ++
 2 files changed, 9 insertions(+)

diff --git a/src/modules/module-avb/gptp.c b/src/modules/module-avb/gptp.c
index 0d44278bd..1a0297c16 100644
--- a/src/modules/module-avb/gptp.c
+++ b/src/modules/module-avb/gptp.c
@@ -18,6 +18,8 @@
 #include <spa/utils/hook.h>
 #include <time.h>
 
+#define server_emit(s,m,v,...) spa_hook_list_call(&s->listener_list, struct server_events, m, v, ##__VA_ARGS__)
+#define server_emit_gm_changed(s, n, g)	server_emit(s, gm_changed, 0, n, g)
 
 struct gptp {
 	struct server *server;
@@ -207,8 +209,13 @@ static bool update_ts_refclk(struct gptp *gptp) {
 	// When GM is not equal to own clock we are clocked by external master
 	pw_log_debug("Synced to GM: %s", (memcmp(cid, gmid, 8) != 0) ? "true" : "false");
 
+	struct timespec now;
 	memcpy(gptp->clock_id, cid, 8);
 	memcpy(gptp->gm_id, gmid, 8);
+
+	clock_gettime(CLOCK_REALTIME, &now);
+	server_emit_gm_changed(gptp->server, SPA_TIMESPEC_TO_NSEC(&now), gmid);
+
 	return gmid_changed;
 }
 
diff --git a/src/modules/module-avb/internal.h b/src/modules/module-avb/internal.h
index a9a38d0c6..4fe8e7e75 100644
--- a/src/modules/module-avb/internal.h
+++ b/src/modules/module-avb/internal.h
@@ -61,6 +61,8 @@ struct server_events {
 	void (*periodic) (void *data, uint64_t now);
 
 	int (*command) (void *data, uint64_t now, const char *command, const char *args, FILE *out);
+
+	void (*gm_changed) (void *data, uint64_t now, uint8_t gm_id[8]);
 };
 
 struct descriptor {