shmsink changes from 1.0.10 to 1.1.4

[Peter Maersk-Moller]

Hi.

Apparently there are some changes in plugin shmsink between 1.0.10 and
1.1.4 that breaks how external programs should use the shmsink. I tried to
look in the release announcements for 1.1.1-1.1.4, but only smaller changes
mostly wrt to how gstreamer handles shmsinks without a connected process
are listed. Nevertheless, there appear to me to be changes that goes beyond
that.

I have a program, namely Snowmix that uses the shm of GStreamer heavily and
it works quite well up till 1.0.10, but for 1.1.4 the shmsink doesn't seem
to understand when I signal that I have read the buffer it has send. I do
receive frames send via shmsink until the allocated shm area has been used,
and then no more, even though I signal over the control connection, that I
have released the buffers sent.

Has the binary layout format for the control connection messages changed?
If yes, in what way? Is it documented somewhere?

If the binary format has changed, we really need for it to be able to tell
its version over the control connection so applications can detect the
gstreamer version and act accordingly.

The pipeline used for testing is this simple pipeline

RAWVIDEO='video/x-raw, format=(string)BGRA, bpp=(int)32, depth=(int)32,
endianness=(int)4321, width=(int)1280, height=(int)720,
framerate=(fraction)24/1, pixel-aspect-ratio=(fraction)1/1,
interlaced=(boolean)false'

gst-launch-1.0 -v videotestsrc is-live=true !\
    $RAWVIDEO !\
    queue !\
    identity !\
    shmsink socket-path=/tmp/feed1-control-pipe shm-size=10000000
wait-for-connection=1 sync=true

Kind regards
Peter MM
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