Dynamically replacing uridecodebin

[A. Bikadorov]

Yes. Unfortunately using playbin is not an option: I also have support for Spotify streams
with a proprietary library by using a tcpserversrc element.

And playbin simply can't handle that (as far as I know).

Cheers
Alex

On 02.10.2014 01:23, Tim Müller wrote:
> On Wed, 2014-10-01 at 22:20 +0200, A. Bikadorov wrote:
> 
> Hi,
> 
>> I need some 'best practice' advice on how to replace an uridecodebin for the current
>> playing song with a new one for the next song to achieve gapless playback (as much as
>> possible).
> 
> Are you aware that playbin supports gapless playback via the
> "about-to-finish" signal?
> 
>  Cheers
>   -Tim
> 
>> The pipeline is simplified
>> [ [uridecodebin] -> [audiobin] ]
>> with a queue as first element in audiobin.
>>
>> I know the uridecodebin can be replaced in the callback for the "drained" signal, and this
>> what I came up with so far:
>> - creating a new uridecodebin and setting the uri
>> - removing the old uridecodebin and adding the new one to the pipeline
>> - setting it to the "play" state
>> - the bins are linked together in the "pad-added" callback
>>
>> But this raises some issues:
>> - The next song is played from the position where the old one ended, i.e. the clock is set
>> the clock of the pipeline. This is also stated in the docs [1].
>> - Seeking is not possible anymore after the bin was replaced. As a workaround all changes
>> have to be reverted
>> - I couldn't find a signal that is send when the transition to the next song is done to
>> notify the application
>>
>> Hope, someone can tell me the general approach for this. Or link to code where this is
>> done, I assume it's not an odd use case.
>>
>> Thanks!
>> Alex
>>
>> [1]:
>> http://gstreamer.freedesktop.org/data/doc/gstreamer/head/manual/html/section-dynamic-pipelines.html
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>