sys/ximage/ximagesink.c: Fixed a tricky race.

Original commit message from CVS:
2005-11-27  Julien MOUTTE  <julien@moutte.net>

* sys/ximage/ximagesink.c: (gst_ximage_buffer_free),
(gst_ximagesink_ximage_new), (gst_ximagesink_ximage_put),
(gst_ximagesink_bufferpool_clear),
(gst_ximagesink_buffer_alloc),
(gst_ximagesink_expose): Fixed a tricky race.
* sys/ximage/ximagesink.h:
* sys/xvimage/xvimagesink.c: (gst_xvimagesink_xvimage_put),
(gst_xvimagesink_expose): Fixed a tricky race.
* sys/xvimage/xvimagesink.h:

4 files changed, 40 insertions, 19 deletions

diff --git a/sys/ximage/ximagesink.c b/sys/ximage/ximagesink.c
index e867f772..91a7200b 100644
--- a/sys/ximage/ximagesink.c
+++ b/sys/ximage/ximagesink.c
@@ -1,5 +1,5 @@
 /* GStreamer
- * Copyright (C) <2003> Julien Moutte <julien@moutte.net>
+ * Copyright (C) <2005> Julien Moutte <julien@moutte.net>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ -229,6 +229,15 @@ beach:
 }
 
 static void
+gst_ximage_buffer_free (GstXImageBuffer * ximage)
+{
+  /* make sure it is not recycled */
+  ximage->width = -1;
+  ximage->height = -1;
+  gst_buffer_unref (GST_BUFFER (ximage));
+}
+
+static void
 gst_ximage_buffer_init (GstXImageBuffer * ximage_buffer, gpointer g_class)
 {
 #ifdef HAVE_XSHM
@@ -456,7 +465,7 @@ beach:
   g_mutex_unlock (ximagesink->x_lock);
 
   if (!succeeded) {
-    gst_buffer_unref (GST_BUFFER (ximage));
+    gst_ximage_buffer_free (ximage);
     ximage = NULL;
   }
 
@@ -555,16 +564,12 @@ gst_ximagesink_ximage_put (GstXImageSink * ximagesink, GstXImageBuffer * ximage)
 
   g_return_if_fail (GST_IS_XIMAGESINK (ximagesink));
 
-  if (!ximage) {
-    return;
-  }
-
   /* We take the flow_lock. If expose is in there we don't want to run 
      concurrently from the data flow thread */
   g_mutex_lock (ximagesink->flow_lock);
 
   /* Store a reference to the last image we put, loose the previous one */
-  if (ximagesink->cur_image != ximage) {
+  if (ximage && ximagesink->cur_image != ximage) {
     if (ximagesink->cur_image) {
       GST_DEBUG_OBJECT (ximagesink, "unreffing %p", ximagesink->cur_image);
       gst_buffer_unref (ximagesink->cur_image);
@@ -572,6 +577,16 @@ gst_ximagesink_ximage_put (GstXImageSink * ximagesink, GstXImageBuffer * ximage)
     ximagesink->cur_image = GST_XIMAGE_BUFFER (gst_buffer_ref (ximage));
   }
 
+  /* Expose sends a NULL image, we take the latest frame */
+  if (!ximage) {
+    if (ximagesink->cur_image) {
+      ximage = ximagesink->cur_image;
+    } else {
+      g_mutex_unlock (ximagesink->flow_lock);
+      return;
+    }
+  }
+
   gst_ximagesink_xwindow_update_geometry (ximagesink, ximagesink->xwindow);
 
   src.w = ximage->width;
@@ -1117,7 +1132,7 @@ gst_ximagesink_bufferpool_clear (GstXImageSink * ximagesink)
 
     ximagesink->buffer_pool = g_slist_delete_link (ximagesink->buffer_pool,
         ximagesink->buffer_pool);
-    gst_ximagesink_ximage_destroy (ximagesink, ximage);
+    gst_ximage_buffer_free (ximage);
   }
 
   g_mutex_unlock (ximagesink->pool_lock);
@@ -1508,7 +1523,7 @@ alloc:
 
       /* If the ximage is invalid for our need, destroy */
       if ((ximage->width != width) || (ximage->height != height)) {
-        gst_ximagesink_ximage_destroy (ximagesink, ximage);
+        gst_ximage_buffer_free (ximage);
         ximage = NULL;
       } else {
         /* We found a suitable ximage */
@@ -1687,7 +1702,7 @@ gst_ximagesink_expose (GstXOverlay * overlay)
   if (!ximagesink->xwindow)
     return;
 
-  gst_ximagesink_ximage_put (ximagesink, ximagesink->cur_image);
+  gst_ximagesink_ximage_put (ximagesink, NULL);
 }
 
 static void
diff --git a/sys/ximage/ximagesink.h b/sys/ximage/ximagesink.h
index d9401941..1383f773 100644
--- a/sys/ximage/ximagesink.h
+++ b/sys/ximage/ximagesink.h
@@ -1,5 +1,5 @@
 /* GStreamer
- * Copyright (C) <2003> Julien Moutte <julien@moutte.net>
+ * Copyright (C) <2005> Julien Moutte <julien@moutte.net>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
diff --git a/sys/xvimage/xvimagesink.c b/sys/xvimage/xvimagesink.c
index 987ddb26..ebda4511 100644
--- a/sys/xvimage/xvimagesink.c
+++ b/sys/xvimage/xvimagesink.c
@@ -1,5 +1,5 @@
 /* GStreamer
- * Copyright (C) <2003> Julien Moutte <julien@moutte.net>
+ * Copyright (C) <2005> Julien Moutte <julien@moutte.net>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ -587,16 +587,12 @@ gst_xvimagesink_xvimage_put (GstXvImageSink * xvimagesink,
   g_return_if_fail (GST_IS_XVIMAGESINK (xvimagesink));
   g_return_if_fail (xvimagesink->xwindow != NULL);
 
-  if (!xvimage) {
-    return;
-  }
-
   /* We take the flow_lock. If expose is in there we don't want to run 
      concurrently from the data flow thread */
   g_mutex_lock (xvimagesink->flow_lock);
 
   /* Store a reference to the last image we put, loose the previous one */
-  if (xvimagesink->cur_image != xvimage) {
+  if (xvimage && xvimagesink->cur_image != xvimage) {
     if (xvimagesink->cur_image) {
       GST_DEBUG_OBJECT (xvimagesink, "unreffing %p", xvimagesink->cur_image);
       gst_buffer_unref (xvimagesink->cur_image);
@@ -604,6 +600,16 @@ gst_xvimagesink_xvimage_put (GstXvImageSink * xvimagesink,
     xvimagesink->cur_image = GST_XVIMAGE_BUFFER (gst_buffer_ref (xvimage));
   }
 
+  /* Expose sends a NULL image, we take the latest frame */
+  if (!xvimage) {
+    if (xvimagesink->cur_image) {
+      xvimage = xvimagesink->cur_image;
+    } else {
+      g_mutex_unlock (xvimagesink->flow_lock);
+      return;
+    }
+  }
+
   gst_xvimagesink_xwindow_update_geometry (xvimagesink, xvimagesink->xwindow);
 
   src.w = xvimage->width;
@@ -2002,7 +2008,7 @@ gst_xvimagesink_expose (GstXOverlay * overlay)
   if (!xvimagesink->xwindow)
     return;
 
-  gst_xvimagesink_xvimage_put (xvimagesink, xvimagesink->cur_image);
+  gst_xvimagesink_xvimage_put (xvimagesink, NULL);
 }
 
 static void
diff --git a/sys/xvimage/xvimagesink.h b/sys/xvimage/xvimagesink.h
index fa88aa8c..80bb1f5f 100644
--- a/sys/xvimage/xvimagesink.h
+++ b/sys/xvimage/xvimagesink.h
@@ -1,5 +1,5 @@
 /* GStreamer
- * Copyright (C) <2003> Julien Moutte <julien@moutte.net>
+ * Copyright (C) <2005> Julien Moutte <julien@moutte.net>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public