"hot-linking" audioecho into pipeline results in silence for a period

[Charlie FG]

On 09/01/15 19:52, Stefan Sauer wrote:
> On 01/09/2015 12:37 AM, Charlie FG wrote:
>> I place 'audioecho' element (already linked between two 'audioconvert'
>> elements) into the pipeline but 3500 milliseconds after it has switched
>> to PLAYING ... It does work but with a major drawback - there is silence
>> for ~3500ms (once the 'queue' has expended it's buffers). If I change
>> the time of the hot-linking event to, say, 12000ms it will be silent for
>> ~12000ms; once it has seemingly caught up, it will play from the point
>> the 'audioecho' was linked in, with the echo active.
> It's an filter element that does transform inplace - that is the output
> buffers have the same metadata is the inputs. Is your code public,
> seeing it might help, this sounds a bit like as if the new elements are
> not properly setup in terms of the playback segment.
>
> Stefan

Stefan,

First, thank you very much for your time!

For quick reference - a PipeSegment is a collection of elements to be
put into a Pipeline. The Pipeline is acting as an abstraction of
GstPipeline. The PipeSegments share the common GstPipeline held in the
Pipeline object they added to.

Here is the main flow so you don't have to waste time hunting around in
the repo for the bits and bobs.

---

The setup of the initial pipeline is in loadplay.cpp, from line 32
After the event is triggered, it tells the Pipeline to insert a new
'effects' PipeSegment on 64
(The effects PipeSegment is defined on line 97

https://github.com/carrotsrc/rackoonIO/blob/master/gst/loadplay.cpp

----

The insertion jumps to Pipeline.cpp, Pipeline::insertSegment() on line
26. Here is where the blocking probe is added.

https://github.com/carrotsrc/rackoonIO/blob/master/gst/lib/Pipeline.cpp

---

Once the probe is added, it jumps to AudioEvents.cpp into the only
function in there. Here is where it
* sets the new elements' state to PLAYING (19)
* adding the new elements to the bin + linking them together (22)
* unlinking of the two surrounding elements (24)
* linking new elements into pipeline (26,29)
* removing pad

https://github.com/carrotsrc/rackoonIO/blob/master/gst/lib/AudioEvents.cpp

---

The issue may be compounded by my making it semi-oop without
properly understanding Gstreamer ;)

Charlie