"Gaps" in Buzzmachines cause silence in downstream machines

[dlbeswick]

As seen above, the symsin is set up to make a very quick pulse; a click. The PanzerDelay echoes every four ticks and the freeverb has a very long reverb.

What I see is that the freeverb only outputs when the PanzerDelay is actually outputting something; the reverb doesn't tail off as expected.

Always calling GST_BUFFER_FLAG_UNSET (outbuf, GST_BUFFER_FLAG_GAP) in gst_bml_transform_transform_ip_* fixes this issue, and the reverberation happens as it should.

Is this a BML issue or freeverb issue, or something else?

Example song here: bug-bml-gaps.txt

[ensonic]

This code

buzztrax/src/gst/bml/common.c

Line 1092 in 6928801

gstbml_fix_data (GstElement * elem, GstMapInfo * info, gboolean has_data)

is checking results from buzzmachine effects
https://github.com/Buzztrax/buzztrax/blob/master/src/gst/bml/gstbmltransform.c#L346
and sets the gap flag is the buffer is all silence.

Luckily we do have the source for panzerdelay and it see to return the has_data flag:
https://github.com/Buzztrax/buzzmachines/blob/master/FSM/PanzerDelay/PanzerDelay.cpp#L724

Also the freeverb plugin seems to explicitly hand the gap flag:
https://github.com/GStreamer/gst-plugins-bad/blob/master/gst/freeverb/gstfreeverb.c#L919

Sounds like some printf debugging is due :/