RFR: 8264737: JavaFX media stream stops playing after reconnecting via Remote Desktop

[Kevin Rushforth]

On Sat, 24 Apr 2021 02:23:19 GMT, Alexander Matveev <almatvee at openjdk.org> wrote:

> Remote Desktop will change default audio device when connecting or disconnecting to it's own audio device. Also, when remote desktop is disconnect, then remote desktop default audio device is removed and system default device is not restored until user logs back to computer. So, after remote desktop is disconnected, then system left without any default audio devices.
> 
> To fix this we will unload DirectSound when audio device is gone and will continue playback by throwing away audio data. Once we receive notification that default audio device is back, we will load it and continue playback via this device.
> 
> Loading device done in loop, since it is not always available right after notification, but will be after very short period of time.
> 
> Tested by connecting/disconnecting remote desktop and switching between remote and normal desktop. In second case audio will switch between remote or speakers.
> 
> Since audio device is gone and not restored after disconnect, there will be no audio on machine local speakers, until user logs back again.

As far as I can tell, the code changes look fine to me.

While testing this, the stream always keeps playing now. Sometimes I can't hear the audio, when it reconnects while playing the stream the first time. What I did was:

1. Run Ensemble
2. Select the "Audio Bar Chart" sample
3. Disconnect from remote desktop
4. Reconnect to remote desktop

The audio stream continues to play, as seen by the chart continuing to be updated, but I can't hear anything. If I select any other sample, and then select the Audio Bar Chart sample again, I can disconnect / reconnect and everything is fine -- I can hear the audio.

Btw, the same thing happens if I initially select the Advanced Media sample. If it is the first media sample that is run, then when I disconnect / reconnect, I can't hear anything, but the video keeps playing.

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PR: https://git.openjdk.java.net/jfx/pull/479