Issue pfls event to metadata pipe when pausing, stopping or changing tracks

[aleszczynskig]

Is your feature request related to a problem? Please describe.
Can you issue a pfls command to the shairport-sync style metadata pipe when either pausing, stopping or changing track. This enables forked-daapd to immediately pause as opposed to a significant delay or 4-5 seconds before the command is observed in forked-daapd due to the audio stream ending. I have requested @ejurgensen to implement this feature in forked-daapd which has been done (see issue 295). Many thanks.

Describe the solution you'd like
Issue a 'pfls' event to the configured metadata pipe when pausing, stopping or changing track.

Describe alternatives you've considered
None

Additional context
The command required to be issued is <item><type>73736e63</type><code>70666C73</code><length>0</length></item>

[devgianlu]

What is <item><type>73736e63</type><code>70666C73</code><length>0</length></item> for? Pause, stop or track change?

[aleszczynskig]

It's the pfls command. It instructs forked-daapd to drop the content on the audio buffer (which removes the lag). So the same command can be issued for all of them.

Thanks for looking at this.

[devgianlu]

Got it. Let me know if it works

[aleszczynskig]

This is working exactly as expected. Thank you for the quick fix. When using librespot-java with forked-daapd, the controls are really responsive.

I will close the ticket.