Review for demo GUI

Shubham Chaudhary shubhamchaudhary92 at
Tue May 21 17:37:35 BST 2013

On 5/21/13, Christian Esken <christian at> wrote:
> Am 17.05.2013 22:46, schrieb Shubham Chaudhary:
>> Martin Sandsmark thanks to your suggestion it can now auto-discover
>> any MPRIS compatible media player and with the help of this QMpris
>> library the code is much more generic now.
>> I've been working on this library for more than few weeks now and I
>> still realise that a lot of work needs to be done on the it, but any
>> suggestion or improvement regarding the library or the structure of
>> the application before I start expanding the library will be really
>> helpful.
>> Can somebody please take a look at the MPRIS library in this
>> application ( ) and offer some
>> suggestions / improvements.
>> On 4/23/13, Shubham Chaudhary <shubhamchaudhary92 at> wrote:
>>> On 4/22/13, Martin Sandsmark <martin.sandsmark at> wrote:
>>>> Nice!
>>> Thanks a ton for your time.
>>>> Only comment I have is that you should probably make the code more
>>>> generic
>>>> (use a single function that takes the name of the player or something),
>>>> would make it easier to support more players without having to hardcode
>>>> all the
>>>> dbus paths.
>>> I couldn't agree more. My next priority task.
>>>> Also auto-discovery would be nice, without having to know about
>>>> all the players (just look for "mpris" in the available dbus
>>>> interfaces?).
>>> I'll definitely look into it.
> Hello Shubham,
> there is one important thing you must account for in your design: Your
> whole DBUS communication must be asynchronous. I see you are using
> synchronous methods, which simply will not work
> reliable. You will end up having long-time-hangs/locking/deadlocking

Thanks a lot Christian for your valuable time,

I totally agree with you here, even I faced some problems that made me
realized the gravity of this mistake.
Actually Amarok takes some time before it actually sends the metadata
of next song, so whenever I pressed next or previous button, the
metadata and album art fields would go blank.
Clementine and several other player were working perfectly fine in
this context, so I discussed it with #amarok guys, finally we had to
make a patch in Amarok's MPRIS2 interface to support this fast
retrieval of metadata information like other players.
I hope that the patch gets committed, but what I realized from this
was that I can't rely on the synchronous methods. I'm planning to
modify the QMpris library accordingly.

> with the applications you are controlling. I learned that the hard way
> by being swamped with a massive amount of KMix bug reports.
>   Christian
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Shubham Chaudhary

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