RFR: 8242530: [macos] Some audio files miss spectrum data when another audio file plays first

[Ambarish Rapte]

On Wed, 15 Apr 2020 23:17:56 GMT, Alexander Matveev <almatvee at openjdk.org> wrote:

> https://bugs.openjdk.java.net/browse/JDK-8242530
> 
> - GstElementClass which is base class for all elements has same instance between all spectrum elements (not sure if it is
>   same for all elements) and thus post_message was sending events to AVFoundation callback from GStreamer platform. This
>   issue is reproducible if we load OSXPlatfrom first and then play media files using GStreamer. Fixed by introducing
>   separate callback to send messages to AVFoundation.

looks good to me...

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Marked as reviewed by arapte (Reviewer).

PR: https://git.openjdk.java.net/jfx/pull/184