From Buzztard

Playback controllers are external entities that can control playback (play/stop, seek, loop, change volume).

upnp via coherence

Simple socket protocol from upnp coherence backend.

commands

• content directory

 bt               ch
 ---              ---
  |<- browse ------|
  |-- <playlist> ->|

 bt               ch
 ---              ---
  |-- flush ------>|
  |<- browse ------|
  |-- <playlist> ->|

• transport service

 bt                ch
 ---               ---
  |<- play ---------|
  |-- playing ----->|
  |<- stop ---------|
  |-- stopped ----->|
  |<- goto <index> -|
  |<- status -------|
  |-- <event> ----->|

playlist entries can be selected in any state.

• states?

 bt                        ch
 ---                       ---
  |<- set <option> <value> -|
  |-- changed ------------->|

data

• playlist

playlist|songname|label0|label1|label 2|...

• index

<number>

• label

text

• event

event|<state>|<label>|<position>|<length>|<volume>

• • state

 playing,stopped

• • position, length

 <h:m:s.ms>

• • volume

 <xxx %>

ideas

• options

set <option> <value>
option = {repeat,...}

midi

We could have a module where one can assign some midi-controls: buttons: play, stop range: volume, playback pos

osc

We can export some control paths to allow osc clients to remote control buzztard.