[Android] [PATCH] Lower the volume of VLC when losing audio focus.

[Wan Zhou]

Hi,

With the VLC 2.5.8 on top box of Android N, we found an issue that all audio track's volume will be reduced when launching a voice assistance.
That is because VLC lower the system volume of STREAM_MUSIC when it receives AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK.
Actually, VLC only need to turn down its own volume while losing audio focus of AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK.
Please review the attached patch for details.
Thanks.

Best Regards,
Wan


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