push-buffer is invalid for instance of type GstWebRTCBin

Question

Hi i am trying to push data into a webrtcbin of Gstreamer. this is my pipeline which works fine with testdata

    pipeline = 
        gst_parse_launch("webrtcbin "
        "name=webrtcbin stun-server=stun://stun.l.google.com:19302 "
        "appsrc ! videorate ! "
        "video/x-raw,"
        "width=1280,"
        "height=720,"
        "framerate=15/1 "
        "! videoconvert ! queue max-size-buffers=1 ! "
        "x264enc bitrate=600 speed-preset=ultrafast tune=zerolatency key-int-max=15 ! "
        "video/x-h264,profile=constrained-baseline ! queue max-size-time=100000000 ! h264parse ! "
        "rtph264pay config-interval=-1 name=payloader ! "
        "application/x-rtp,"
        "media=video,"
        "encoding-name=H264,"
        "payload=96 ! webrtcbin. ", &error);

Now i try to push in some camera data based on my reading of https://gstreamer.freedesktop.org/documentation/app/appsrc.html?gi-language=c

    GstFlowReturn ret;
    memcpy(gst_Imageptr, msg->data.data(), msg->data.size());
    gst_ImageBuffer = gst_buffer_new_wrapped((void*)gst_Imageptr, msg->data.size());
    g_signal_emit_by_name(webrtcbin, "push-buffer", gst_ImageBuffer, &ret);
    if (ret != GST_FLOW_OK) {
        /* some error, stop sending data */
        GST_DEBUG ("some error");
    }

but I get the error

push-buffer' is invalid for instance '0x55bb4cc0f0' of type 'GstWebRTCBin

So my question is, is there a different way to push data into a GstWebRTCBin? the page https://gstreamer.freedesktop.org/documentation/webrtc/index.html?gi-language=c#signals only show signals relevant for setting up a connection.

Thanks for any advice!!

Answer 1

So i found my problem, and as alyways it was very simple but for me hard due to the lack of knowledge in gstreamer

i tried to push the signal against the webrtcbin wbile i should have been pushing against the appsrc. these are different units.

so i gave the appsrc a name:

"webrtcbin name=webrtcbin stun-server=stun://stun.l.google.com:19302 "
"appsrc name=CaliCam !"
"video/x-raw, format=BGR, width=640, height=480, framerate=10/1 !"

And then stored the bin for reference

GstElement *appsrc = gst_bin_get_by_name( GST_BIN( pipeline), "CaliCam");

with that i could push the signal

g_signal_emit_by_name(appsrc, "push-buffer", gst_ImageBuffer, &ret);

the memory copy workes with both versions. I am not sure yet if allocating the memory beforehand (the way i did it) and securing its existance is less CPU and Memory efficient or not compared to the suggestion of tomaszmi. but that was not the point in the post