--- emulators/virtualbox-ose/work/VirtualBox-5.2.34/src/VBox/Devices/Audio/DrvHostOSSAudio.cpp.orig	2019-10-10 11:09:31.000000000 -0700

+++ emulators/virtualbox-ose/work/VirtualBox-5.2.34/src/VBox/Devices/Audio/DrvHostOSSAudio.cpp	2020-07-11 17:50:06.963665000 -0700

@@ -248,11 +248,11 @@

                 break;

             default:

-                rc = VERR_AUDIO_STREAM_COULD_NOT_CREATE;

+                iFormat = -1;

                 break;

         }

-        if (RT_FAILURE(rc))

+        if (RT_UNLIKELY(iFormat == -1))

             break;

         if (ioctl(hFile, SNDCTL_DSP_SAMPLESIZE, &iFormat))

@@ -660,6 +660,7 @@

                 pCfgAcq->Backend.cfPeriod     = PDMAUDIOSTREAMCFG_B2F(pCfgAcq, ossAcq.cbFragmentSize);

                 pCfgAcq->Backend.cfBufferSize = pCfgAcq->Backend.cfPeriod * 2; /* Use "double buffering". */

+                pCfgAcq->Backend.cfPreBuf     = pCfgAcq->Backend.cfBufferSize;

                 /** @todo Pre-buffering required? */

             }

         }

@@ -778,6 +779,7 @@

 #endif

             pCfgAcq->Backend.cfPeriod     = PDMAUDIOSTREAMCFG_B2F(pCfgAcq, obtStream.cbFragmentSize);

             pCfgAcq->Backend.cfBufferSize = pCfgAcq->Backend.cfPeriod * 2; /* Use "double buffering" */

+            pCfgAcq->Backend.cfPreBuf     = pCfgAcq->Backend.cfBufferSize;

         }

     } while (0);