From a6e02449fb3e2e44465a76eedadd9cd0593c698f Mon Sep 17 00:00:00 2001
From: Mike Brady <4265913+mikebrady@users.noreply.github.com>
Date: Thu, 22 Sep 2022 16:25:57 +0100
Subject: [PATCH] Increase the RTSP idle timeout to ten seconds, and confine
 its operation to realtime and classic AirPlay only.:

---
 rtsp.c | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/rtsp.c b/rtsp.c
index 8188425e..370d083d 100644
--- a/rtsp.c
+++ b/rtsp.c
@@ -1275,14 +1275,11 @@ void clear_ptp_clock() {
 
 ssize_t read_from_rtsp_connection(rtsp_conn_info *conn, void *buf, size_t count) {
   // first try to read with a timeout, to see if there is any traffic...
-  ssize_t response = timed_read_from_rtsp_connection(conn, 4000000000L, buf, count);
+  ssize_t response = timed_read_from_rtsp_connection(conn, 10000000000L, buf, count);
   if ((response == -1) && ((errno == EAGAIN) || (errno == EWOULDBLOCK))) {
     if (conn->rtsp_link_is_idle == 0) {
       debug(1, "Connection %d: RTSP connection is idle.", conn->connection_number);
       conn->rtsp_link_is_idle = 1;
-#ifdef CONFIG_AIRPLAY_2
-      clear_ptp_clock();
-#endif
       conn->udp_clock_sender_is_initialised = 0;
       conn->udp_clock_is_initialised = 0;
     }
@@ -1291,15 +1288,22 @@ ssize_t read_from_rtsp_connection(rtsp_conn_info *conn, void *buf, size_t count)
   if (conn->rtsp_link_is_idle == 1) {
     conn->rtsp_link_is_idle = 0;
     debug(1, "Connection %d: RTSP connection traffic has resumed.", conn->connection_number);
+#ifdef CONFIG_AIRPLAY_2
+    if (conn->airplay_stream_type == realtime_stream) {
+      conn->last_anchor_info_is_valid = 0;
+      conn->anchor_remote_info_is_valid = 0;
+      conn->first_packet_timestamp = 0;
+      conn->input_frame_rate_starting_point_is_valid = 0;
+      ab_resync(conn);
+    }
+#else
+    conn->last_anchor_info_is_valid = 0;
     conn->anchor_remote_info_is_valid = 0;
     conn->local_to_remote_time_difference_measurement_time = 0;
     conn->local_to_remote_time_difference = 0;
     conn->first_packet_timestamp = 0;
     conn->input_frame_rate_starting_point_is_valid = 0;
     ab_resync(conn);
-#ifdef CONFIG_AIRPLAY_2
-    conn->last_anchor_info_is_valid = 0;
-    set_client_as_ptp_clock(conn);
 #endif
   }
   return response;