OSX plugin output changes systemwide audio output device

the-gingerbread-man commented 4 years ago

Description

The OSX plugin does not direct audio output from MPD to my external DAC as expected. Instead of "hogging" it, the hog_device property redirects systemwide audio output to the device. When hog mode is disabled, MPD outputs to the default system output rather than the device specified in its configuration.

Config (excerpt from mpd.conf)

audio_output  {
    type          "osx"
    name          "Schiit USB Multibit"
    hog_device    "yes"
    mixer_type    "none"
}

Expected Behavior

When hog_device is enabled, MPD should obtain exclusive access to the selected output device. System default output should not be directed to the device, and no other application should be able to access the device while MPD is running.

If possible, when hog_device is not enabled, MPD should still output to the selected device, but other applications and the system as a whole should be able to access the device as well. It should be possible to configure the system default audio output device independently.

Actual Behavior

When MPD starts, if hog_device is enabled, the system-wide audio output device is set to whichever audio device is specified in mpd.conf. If hog_device is not enabled, MPD outputs to CoreAudio and the default system output device. I am unable to change the system audio output device in Audio MIDI Setup while MPD is running in hog mode, but when MPD exits the system reverts to the selected output device.

Version

MacOS 10.15.4 (Catalina) running on a MacBook Air

Music Player Daemon 0.21.23 (0.21.23) Copyright 2003-2007 Warren Dukes warren.dukes@gmail.com Copyright 2008-2018 Max Kellermann max.kellermann@gmail.com This is free software; see the source for copying conditions. There is NO warranty; not even MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

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the-gingerbread-man commented 4 years ago

After rebooting, I had a different issue: MPD wouldn't connect to the external device at all, though it showed up in the Audio MIDI Setup device list. (Log message: May 30 00:29 : exception: Failed to read mixer for 'Schiit USB Multibit': unable to get volume: The operation couldn’t be completed. (OSStatus error 2003332927.)) Disconnecting the device and connecting MPD resolved that issue, but the problem described above remains.

MaxKellermann commented 4 years ago

In the bug reporting template, there was a section "Log" saying "Paste relevant portions of the log file here (--verbose)". You deleted it. Don't! Your bug report is incomplete and I cannot help you that way.

MaxKellermann commented 3 years ago

Closing due to lack of reply.

MusicPlayerDaemon / MPD