Handle exception if we try to play non-music file (bug #4416)

CHANGELOG.md

@@ -22,6 +22,7 @@
     Bug #4327: Missing animations during spell/weapon stance switching
     Bug #4368: Settings window ok button doesn't have key focus by default
     Bug #4393: NPCs walk back to where they were after using ResetActors
+    Bug #4416: Handle exception if we try to play non-music file
     Bug #4419: MRK NiStringExtraData is handled incorrectly
     Bug #4426: RotateWorld behavior is incorrect
     Bug #4429: [Windows] Error on build INSTALL.vcxproj project (debug) with cmake 3.7.2

apps/openmw/mwsound/ffmpeg_decoder.cpp

@@ -251,21 +251,24 @@ void FFmpeg_Decoder::open(const std::string &fname)
         if(mOutputChannelLayout == 0)
             mOutputChannelLayout = av_get_default_channel_layout((*mStream)->codec->channels);
     }
-    catch(...) {
+    catch(...)
+    {
         if(mStream)
             avcodec_close((*mStream)->codec);
         mStream = NULL;
 
-        if (mFormatCtx->pb->buffer != NULL)
+        if (mFormatCtx != NULL)
         {
-            av_free(mFormatCtx->pb->buffer);
-            mFormatCtx->pb->buffer = NULL;
-        }
-        av_free(mFormatCtx->pb);
-        mFormatCtx->pb = NULL;
+            if (mFormatCtx->pb->buffer != NULL)
+            {
+                av_free(mFormatCtx->pb->buffer);
+                mFormatCtx->pb->buffer = NULL;
+            }
+            av_free(mFormatCtx->pb);
+            mFormatCtx->pb = NULL;
 
-        avformat_close_input(&mFormatCtx);
-        throw;
+            avformat_close_input(&mFormatCtx);
+        }
     }
 }