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+boot: 0.689
+device: 0.681
+graphic: 0.675
+network: 0.655
+instruction: 0.623
+vnc: 0.619
+other: 0.592
+semantic: 0.591
+socket: 0.581
+assembly: 0.571
+mistranslation: 0.474
+KVM: 0.375
+
+coreaudio not working on MacOS
+
+OS: MacOS Catalina 10.15.2
+
+qemu-system-x86_64 -version
+QEMU emulator version 4.2.50 (v4.2.0-13-g084a398bf8-dirty)
+Copyright (c) 2003-2019 Fabrice Bellard and the QEMU Project developers
+
+Qemu install via brew: brew install qemu
+
+---
+
+I use following to install Ubuntu 18.04 desktop successfully:-
+
+IMG_CD=$HOME/Downloads/iso/ubuntu-18.04.3-desktop-amd64.iso
+IMG_FILE=$HOME/code/vm/qemu/u64d01.qcow2
+MAC_ADDR=xx:xx:xx:xx:xx:xx
+
+qemu-system-x86_64 \
+-no-user-config -nodefaults \
+-show-cursor \
+-name u64d01 \
+-M q35,accel=hvf,usb=off,vmport=off \
+-cpu host -smp 4 -m 2048 \
+-overcommit mem-lock=off \
+-overcommit cpu-pm=off \
+-rtc base=utc,clock=host \
+\
+-device virtio-tablet-pci \
+-device virtio-vga \
+\
+-device virtio-blk-pci,drive=ssd1 \
+-drive id=ssd1,file=$IMG_FILE,if=none,format=qcow2 \
+\
+-device virtio-net-pci,netdev=nic1,mac=$MAC_ADDR \
+-netdev user,id=nic1,ipv4=on,ipv6=on,hostname=u64d01,hostfwd=tcp::2222-:22 \
+\
+-device ich9-intel-hda,id=snd,msi=on \
+-device hda-output,id=snd-codec0,bus=snd.0,cad=0,audiodev=snd0 \
+-audiodev coreaudio,id=snd0,out.buffer-count=10000 \
+\
+-cdrom $IMG_CD
+
+Removing the last -cdrom line Ubuntu desktop boot up and everything work perfectly except the audio.
+
+I test with wav audio driver by replacing the -audiodev line as follow, which save the client audio to a wave file, like below and it work perfectly:
+
+-audiodev wav,id=snd0,path=$HOME/qemu.wav
+
+I start the vm, open firefox and play a few video, then shutdown the vm. Then I can play the qemu.wav file and all the audio was recorded there.
+
+However, I can't get audio directly with coreaudio.
+
+First thing to check is whether you have any other audio applications installed, since there seems to be a long running issue whereby other applications can prevent QEMU from being able to output audio. See https://www.emaculation.com/forum/viewtopic.php?f=34&t=8848&sid=1e5fab3a08347beb3b344be0f953221e&start=150#p60978 for a discussion on this.
+
+Secondly does QEMU 4.1 audio work? There has been a report on list that there is an issue caused by conversion to the new backend audio APIs in 4.2 here: https://lists.gnu.org/archive/html/qemu-devel/2020-01/msg02142.html.
+
+
+I am not using any audio enhancing software.
+
+I start trying qemu + Ubuntu Desktop a few weeks ago and put all configurations together last week, so I never try coreaudio on 4.1.
+
+I recently test it again, coreaudio is working on 4.1.1, 4.2 and 5rc1 on MacOS.
+
+It is working now. Tested with 4.1.1, 4.2 and 5rc1.
+