[Bug 744211] interleave: assertion 'self->func != NULL' failed

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=744211

--- Comment #5 from Vineeth <vineeth.tm at samsung.com> ---
I went through the code again and these are my observations.
The main reason of this error is that,
if channel_positions_from_input is set to TRUE, the channel positions is taken
from input caps.
But whenever channel_positions_from_input is set to FALSE, it is expecting
channel-positions property to be set through pipeline.

I am not sure why a property for channel_positions_from_input is needed.
>From code we are by default initializing it as TRUE. So if will take the
channel position from input caps if provided.
And when we provide property channel-positions then the value will be set to
FALSE and it will take the provided channel-positions.

The problem with controllable channel_positions_from_input property arises when 
it is set without channel-positions property or set after channel-positions
property is set.
These can be verified in the test cases by making some minor changes as
follows.

In the test case test_interleave_2ch_pipeline_input_chanpos,
channel-positions is not being set. When we change the
channel-positions-from-input property to FALSE, then we get the assertion
errors and the test case fails.

In the test case test_interleave_2ch_pipeline_custom_chanpos,
channel-positions are being set, and channel-positions-from-input property is
being set to TRUE before setting channel-positions. But if we set
channel-positions-from-input property after channel-positions then the test
case fails.

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