WebRTC with data channel only?

[Anton Pryima]

Hello Bill.

As you need only a data channel, but neither video nor audio why do you
need Gstreamer? Gstreamer is first of all audio/video framework. It is more
useful to use 3rd party webrtc libraries like (
https://webrtc.googlesource.com/src/+/master/api).

Best regards,
Anton.

On Fri, Jul 17, 2020 at 5:10 PM William Gerecke <gerecke at gmail.com> wrote:

> I'm still having this problem first posted in March.  I'm using GStreamer
> webrtcbin to send data over a WebRTC data channel and all is working well!
> The only problem is for the data channel to be established I also need to
> specify a dummy audio stream as follows:
>
> pipe1 = gst_parse_launch("webrtcbin  name=sendrecv "
>  "audiotestsrc is-live=true  ! audioconvert ! audioresample ! queue !
> opusenc  ! rtpopuspay ! "
>  "queue ! " RTP_CAPS_OPUS "97 ! sendrecv. ", &error);
>
> When I try webrtcbin by itself or with a fakesrc instead of an audio
> source I can still create the data channel as below without errors but I
> never get the "on-open" callback like I do when an audio source is present.
>
> g_signal_emit_by_name(webrtc1, "create-data-channel", "channel", NULL,
> &send_channel);
> if (send_channel) {
>   g_print("Created data channel\n");
>   connect_data_channel_signals(send_channel, session);
> }
>
> So in short - can webrtcbin be configured to work with only data channels,
> and if so, what am I missing?
>
> Bill
>
> On Tue, Mar 31, 2020 at 11:30 AM Bill G <foatus at hotmail.com> wrote:
>
>> Hello,
>>
>> I'm trying to get a webrtcbin running which has data channels only (i.e.
>> no audio, no video.)  I started with the working sendrecv example and got
>> to the point where I had a working data-channel with audio only.  When I
>> remove audio the data channels fail to connect - one data channel is
>> created by GStreamer code, another intiated on the browser side.
>>
>> I found and example (link below) for only receiving streams in which the
>> gst_parse_launch() was removed and one-way transceivers manually added.  I
>> read that without a audio/video sink pad connected the transceivers need to
>> be manually created.  Maybe this is also related to data channels not
>> functioning?
>>
>>
>> https://github.com/centricular/gstwebrtc-demos/compare/master...a-morales:figure-out-transceivers?expand=1
>>
>> So, I'm assuming there is something preventing these data-channels from
>> getting established, and asking how to get past it?  This is with
>> everything running on one machine, Windows and GStreamer 1.16.  Thanks in
>> advance!
>> _______________________________________________
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>> gstreamer-devel at lists.freedesktop.org
>> https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>
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