tests/examples/app/appsrc_ex.c: Some comments.

Original commit message from CVS:
* tests/examples/app/appsrc_ex.c: (main):
Some comments.
When pulling a buffer we can get NULL when the element is EOS, don't try
to unref this NULL buffer.

1 files changed, 7 insertions, 1 deletions

diff --git a/tests/examples/app/appsrc_ex.c b/tests/examples/app/appsrc_ex.c
index bc629fb01..c7aa4b6c8 100644
--- a/tests/examples/app/appsrc_ex.c
+++ b/tests/examples/app/appsrc_ex.c
@@ -67,14 +67,20 @@ main (int argc, char *argv[])
     gst_app_src_push_buffer (GST_APP_SRC (app->src), buf);
   }
 
+  /* push EOS */
   gst_app_src_end_of_stream (GST_APP_SRC (app->src));
 
+  /* _is_eos() does not block and returns TRUE if there is not currently an EOS
+   * to be retrieved */
   while (!gst_app_sink_is_eos (GST_APP_SINK (app->sink))) {
     GstBuffer *buf;
 
+    /* pull the next item, this can return NULL when there is no more data and
+     * EOS has been received */
     buf = gst_app_sink_pull_buffer (GST_APP_SINK (app->sink));
     printf ("retrieved buffer %p\n", buf);
-    gst_buffer_unref (buf);
+    if (buf)
+      gst_buffer_unref (buf);
   }
   gst_element_set_state (app->pipe, GST_STATE_NULL);