From a99be44e3b49bfe74a0275aa7cca302c3889aea9 Mon Sep 17 00:00:00 2001
From: desaulov <desaulov@imaginecommunications.com>
Date: Wed, 13 Aug 2025 10:24:15 -0400
Subject: simulate differential path delay


diff --git a/tests/tools/RxTxApp/src/tx_st20p_app.c b/tests/tools/RxTxApp/src/tx_st20p_app.c
index 77752867..a5cd65ca 100644
--- a/tests/tools/RxTxApp/src/tx_st20p_app.c
+++ b/tests/tools/RxTxApp/src/tx_st20p_app.c
@@ -310,6 +310,14 @@ static int app_tx_st20p_init(struct st_app_context* ctx, st_json_st20p_session_t
   s->framebuff_cnt = ops.framebuff_cnt;
   s->st20p_source_fd = -1;
 
+#if 1
+  // simulate differential path delay, 33 ms
+  if (idx == 0)
+    ops.flags |= ST20_TX_FLAG_RTP_TIMESTAMP_EPOCH;
+  else 
+    ops.rtp_timestamp_delta_us = 33000L;  
+#endif
+
   handle = st20p_tx_create(ctx->st, &ops);
   if (!handle) {
     err("%s(%d), st20p_tx_create fail\n", __func__, idx);