From a2e342caebbb96c2132d32e99bfa3335e86138cb Mon Sep 17 00:00:00 2001
From: Jeffy Chen <jeffy.chen@rock-chips.com>
Date: Mon, 8 Nov 2021 18:45:00 +0800
Subject: [PATCH 32/40] waylandsink: Support frame-sync mode

Set env "WAYLANDSINK_SYNC_FRAME" to enable frame syncing.

Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>
---
 ext/wayland/gstwaylandsink.c | 9 +++++++++
 ext/wayland/gstwaylandsink.h | 1 +
 2 files changed, 10 insertions(+)

diff --git a/ext/wayland/gstwaylandsink.c b/ext/wayland/gstwaylandsink.c
index 4c69a80..3bb786a 100644
--- a/ext/wayland/gstwaylandsink.c
+++ b/ext/wayland/gstwaylandsink.c
@@ -282,6 +282,7 @@ gst_wayland_sink_init (GstWaylandSink * sink)
 {
   g_mutex_init (&sink->display_lock);
   g_mutex_init (&sink->render_lock);
+  g_cond_init (&sink->redraw_cond);
 
   sink->window_handle = 1;
   sink->layer = GST_WL_WINDOW_LAYER_NORMAL;
@@ -437,6 +438,7 @@ gst_wayland_sink_finalize (GObject * object)
 
   g_mutex_clear (&sink->display_lock);
   g_mutex_clear (&sink->render_lock);
+  g_cond_clear (&sink->redraw_cond);
 
   G_OBJECT_CLASS (parent_class)->finalize (object);
 }
@@ -781,6 +783,7 @@ frame_redraw_callback (void *data, struct wl_callback *callback, uint32_t time)
 
   g_mutex_lock (&sink->render_lock);
   sink->redraw_pending = FALSE;
+  g_cond_signal (&sink->redraw_cond);
 
   if (sink->callback) {
     wl_callback_destroy (callback);
@@ -817,6 +820,11 @@ render_last_buffer (GstWaylandSink * sink, gboolean redraw)
   }
   sink->window->fill_mode = sink->fill_mode;
   gst_wl_window_render (sink->window, wlbuffer, info);
+
+  if (g_getenv ("WAYLANDSINK_SYNC_FRAME")) {
+    while (sink->redraw_pending)
+      g_cond_wait (&sink->redraw_cond, &sink->render_lock);
+  }
 }
 
 static void
@@ -1017,6 +1025,7 @@ render:
 
   if (buffer != to_render)
     gst_buffer_unref (to_render);
+
   goto done;
 
 no_window_size:
diff --git a/ext/wayland/gstwaylandsink.h b/ext/wayland/gstwaylandsink.h
index dc3a1d1..376e3a4 100644
--- a/ext/wayland/gstwaylandsink.h
+++ b/ext/wayland/gstwaylandsink.h
@@ -71,6 +71,7 @@ struct _GstWaylandSink
   gboolean resend_info;
   gboolean redraw_pending;
   GMutex render_lock;
+  GCond redraw_cond;
   GstBuffer *last_buffer;
   GstVideoRectangle render_rectangle;
 
-- 
2.17.1