avsync-lib: add API to retrieve current mode

For attached client.

Change-Id: Ic6064ed18218c4f869c32ea6dfdf8cd9f4bf79d9
diff --git a/src/aml_avsync.h b/src/aml_avsync.h
index 733b0cd..a19a218 100644
--- a/src/aml_avsync.h
+++ b/src/aml_avsync.h
@@ -274,6 +274,15 @@
  */
 int av_sync_change_mode(void *sync, enum sync_mode mode);
 
+/* get avsync mode
+ * Params:
+ *   @sync: AV sync module handle
+ *   @mode: pointer to return current mode
+ * Return:
+ *   0 for OK, or error code
+ */
+int av_sync_get_mode(void *sync, enum sync_mode *mode);
+
 /* set pause PTS
  * av sync will pause after reaching the assigned PTS or do step.
  * Need to call @av_sync_pause(false) to resume a the playback.
diff --git a/src/avsync.c b/src/avsync.c
index 07b2479..668074d 100644
--- a/src/avsync.c
+++ b/src/avsync.c
@@ -817,6 +817,17 @@
     return 0;
 }
 
+int av_sync_get_mode(void *sync, enum sync_mode *mode)
+{
+    struct av_sync_session *avsync = (struct av_sync_session *)sync;
+
+    if (!avsync || !mode)
+        return -1;
+
+    *mode = avsync->mode;
+    return 0;
+}
+
 int av_sync_set_pause_pts(void *sync, pts90K pts)
 {
     struct av_sync_session *avsync = (struct av_sync_session *)sync;