AESinkPULSE: Fixup blocked write to be more failsafe

xbmc/cores/AudioEngine/Sinks/AESinkPULSE.cpp

@@ -1092,8 +1092,18 @@ unsigned int CAESinkPULSE::AddPackets(uint8_t **data, unsigned int frames, unsig
   unsigned int length = 0;
   void *buffer = data[0]+offset*m_format.m_frameSize;
   // care a bit for fragmentation
-  while ((length = pa_stream_writable_size(m_Stream)) < m_periodSize)
+  length = pa_stream_writable_size(m_Stream);
+  while (length < m_periodSize)
+  {
     pa_threaded_mainloop_wait(m_MainLoop);
+    unsigned int old_length = length;
+    length = pa_stream_writable_size(m_Stream);
+    // if we don't get more space in the device
+    // between two callbacks, we leave the loop
+    // without space to write we stay in here
+    if ((length != 0) && (length == old_length))
+      break;
+  }
 
   length =  std::min(length, available);