Dynamic Imxg2dcompositor

[chrisplus3]

Hi there,

I am trying to build a dynamic pipeline using the Imxg2dcompositor.
The following is the gst-launch command inside a shell file.

----------------------------------------------------------------------------------------------------
MARGIN=2
JPEGPIPE="caps="application/x-rtp,encoding-name=JPEG,payload=26" !
rtpjpegdepay ! jpegparse ! queue max-size-time=0 max-size-buffers=0 !
imxvpudec"

gst-launch-1.0 imxg2dcompositor name=comp background-color=0xff0000 \
        sink_0::alpha=1 sink_0::fill_color=0x99999999 sink_0::rotation=0
sink_0::keep-aspect-ratio=false \
                sink_0::xpos=0 sink_0::ypos=0 sink_0::width=640 sink_0::height=800 \
                sink_0::left-margin=0 sink_0::right-margin=$MARGIN sink_0::top-margin=0
sink_0::bottom-margin=0 \
        sink_1::alpha=1 sink_1::fill_color=0x99999999 sink_1::rotation=0
sink_1::keep-aspect-ratio=false \
                sink_1::xpos=640 sink_1::ypos=0 sink_1::width=640 sink_1::height=800 \
                sink_1::left-margin=$MARGIN sink_1::right-margin=0 sink_1::top-margin=0
sink_1::bottom-margin=0 \
        ! imxg2dvideosink sync=false async=false use-vsync=true \
        udpsrc port=5004 $JPEGPIPE ! comp.sink_0 \
        udpsrc port=5005 $JPEGPIPE ! comp.sink_1
----------------------------------------------------------------------------------------------------

Now I want to build the elements one by one and finally link the pipeline.
I managed to build the dynamic pipeline in C++ without the compositor (only
one udpsource).
But there is not a single example for the Imxg2dcompositor in C/C++.

So how can I "convert" the gst-launch command to C/C++ code, to be able to
(e.g.) change the position of every element during runtime ?


Thanks in advance!



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[Tim Müller]

On Thu, 2017-10-26 at 01:57 -0700, chrisplus3 wrote:

Hi Chris,

> So how can I "convert" the gst-launch command to C/C++ code

Can't help you with that, sorry :) I'm sure you can find code examples
using "compositor" or "glvideomixer" somewhere though.

> to be able to (e.g.) change the position of every element during
> runtime ?

You can do that in code by

1) getting the input/sink pad from the mixer:

  pad = gst_element_get_static_pad (mixer, "sink_0");
  ...
  gst_object_unref (pad);


2) It has properties for position/zorder/alpha:

  g_object_set (pad, "xpos", 10,  "ypos", 10, NULL);

Cheers
 -Tim

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[chrisplus3]

Hi Tim,

thank you for your response.

>  Can't help you with that, sorry :) I'm sure you can find code examples
>  using "compositor" or "glvideomixer" somewhere though.

I did, indeed find something after quite a long search.
"GStreamer/gst-plugins-bad/blob/master/tests/check/elements/compositor.c"

Regards
Chris



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