From 5a0a0aac192e732e248d6b15343643d01a297817 Mon Sep 17 00:00:00 2001
From: Vincent Penquerc'h <vincent.penquerch@collabora.co.uk>
Date: Tue, 16 Aug 2011 18:34:59 +0100
Subject: [PATCH] ofa: don't crash when there's no data to create a fingerprint
 from

Fixes a crash when no data flowed through.

https://bugzilla.gnome.org/show_bug.cgi?id=656641
---
 ext/ofa/gstofa.c | 23 +++++++++++++++++------
 1 file changed, 17 insertions(+), 6 deletions(-)

diff --git a/ext/ofa/gstofa.c b/ext/ofa/gstofa.c
index d1be48635e..a18d7e352e 100644
--- a/ext/ofa/gstofa.c
+++ b/ext/ofa/gstofa.c
@@ -117,16 +117,27 @@ create_fingerprint (GstOFA * ofa)
   GstBuffer *buf;
   gint rate = GST_AUDIO_FILTER (ofa)->format.rate;
   gint channels = GST_AUDIO_FILTER (ofa)->format.channels;
-  gint endianness =
-      (GST_AUDIO_FILTER (ofa)->format.
-      bigend) ? OFA_BIG_ENDIAN : OFA_LITTLE_ENDIAN;
+  gint endianness;
   GstTagList *tags;
+  guint available;
+
+  available = gst_adapter_available (ofa->adapter);
+
+  if (available == 0) {
+    GST_WARNING_OBJECT (ofa, "No data to take fingerprint from");
+    ofa->record = FALSE;
+    return;
+  }
+
+  if (GST_AUDIO_FILTER (ofa)->format.bigend)
+    endianness = OFA_BIG_ENDIAN;
+  else
+    endianness = OFA_LITTLE_ENDIAN;
+
 
   GST_DEBUG ("Generating fingerprint");
 
-  buf =
-      gst_adapter_take_buffer (ofa->adapter,
-      gst_adapter_available (ofa->adapter));
+  buf = gst_adapter_take_buffer (ofa->adapter, available);
 
   ofa->fingerprint = g_strdup (ofa_create_print (GST_BUFFER_DATA (buf),
           endianness, GST_BUFFER_SIZE (buf) / 2, rate,