From e292045572e59fd681cdbf9093bf9867f173690f Mon Sep 17 00:00:00 2001
From: Brandon Wright <bearoso@gmail.com>
Date: Fri, 24 Nov 2017 19:35:49 -0600
Subject: [PATCH] Handle PulseAudio case where no data can be written.

---
 gtk/src/gtk_sound_driver_pulse.cpp | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/gtk/src/gtk_sound_driver_pulse.cpp b/gtk/src/gtk_sound_driver_pulse.cpp
index d5dca214..f7dd4b07 100644
--- a/gtk/src/gtk_sound_driver_pulse.cpp
+++ b/gtk/src/gtk_sound_driver_pulse.cpp
@@ -268,9 +268,23 @@ S9xPulseSoundDriver::samples_available (void)
 
     bytes = MIN (bytes, (samples << (Settings.SixteenBitSound ? 1 : 0)));
 
+    if (!bytes)
+        return;
+
     lock ();
 
-    pa_stream_begin_write (stream, &output_buffer, &bytes);
+    if (pa_stream_begin_write (stream, &output_buffer, &bytes) != 0)
+    {
+        pa_stream_flush (stream, NULL, NULL);
+        unlock ();
+        return;
+    }
+    if (bytes <= 0 || !output_buffer)
+    {
+        unlock ();
+        return;
+    }
+
     S9xMixSamples ((uint8 *) output_buffer, bytes >> (Settings.SixteenBitSound ? 1 : 0));
     pa_stream_write (stream, output_buffer, bytes, NULL, 0, PA_SEEK_RELATIVE);