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If we are inserting a packet into the jitter queue we need to keep
looping through the items until the right position is found. Currently,
the code stops as soon as an event is found in the queue.

Regarding events, we should only move packets before an event if there
is another packet before the event that has a larger seqnum.

Fixes https://bugzilla.gnome.org/show_bug.cgi?id=730078

https://bugzilla.gnome.org/show_bug.cgi?id=728418

When extrapolating the offset, we need to use the extrapolate
stride rather then the base stride. This should fix support for format
with more then two planes (I420, Y42B, etc).

When doing frame operation, we need to use the default VideoInfo
and let the frame API read the video meta in order to get the stride
and offset right. Currently we where using the specialized VideoInfo
which reflects what the HW is setup to.

Simplify framerate field if possible, so we don't end up with
e.g. framerate = (fraction) { 30/1 }. Maybe the helper function
should be moved to core, but we can do this later.

CID #1212151

CID #1212134

Pollutes debug logs for no reason. It's only an error if all pads
return not-linked

We add a new mode (SKIP) in push-mode to skip tags that we don't known about

Partially fixes https://bugzilla.gnome.org/show_bug.cgi?id=670712

This dead code wasn't used since the 1.0 port and would need to
be modified heavily for variable block size support.

https://bugzilla.gnome.org/show_bug.cgi?id=729894

CID 1212129

CID 1212131

When we detect a lost packet, expect packets with higher
seqnum on the input.

Also update the unit test.

Fixes https://bugzilla.gnome.org/show_bug.cgi?id=729524

Activation will happen in the state change

this fixes a leak of the config structure and take care of making sure
caps can't reach ref 0 before we are done doing our check.

CID 1212144

CIDs 1212167 and  1212167

CID #1212173

https://bugzilla.gnome.org/show_bug.cgi?id=729553

CID 1212145.

This moves away from copying information and store everything inside
the GstVideoInfo structure. The alignement exposed by v4l2 api
is now handled using proper offset.

This ensure that the buffer pool won't always discard buffer with these
memory when they are released.

This ensure that a flushed group memory are the same size as when they
where originally allocated / imported.

The value of num_allocated buffer would get confused when
buffer are being discarded.

Need to include config.h, otherwise we endup directly using the
ioct/mmap/munmap calls and need to vall v4l2_munmap.

We where not setting the probed flags on the allocator, which mean even if
CREATE_BUFS was supported on some driver, it would endup being ignored.

Return a buffer from an otherpool has unwanted side effects that lead to leaks and
prevents deactivating the pool. Instead, we change the _process() API so it can
replace the internal buffer with the buffer from the downstream pool. This implied
moving from _fill() to _create() method in the src.